VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T11:22:01ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2019-12-09T05:55:33Z2019-12-09T05:55:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3027This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30272019-12-09T05:55:33ZA compact exclusion-enrichment microfluidic chip with integrated impedance biosensor for lowconcentration protein detectionThis paper presents a design of a compact system for low concentration protein detection based on an effectiveness concentrator which is relied on exclusion-enrichment effect (EEE) and a highly sensitivity lock-in impedance measurement technique. Experiment results suggested that protein concentration of down to sub-nanomolar can be detected by the proposed system.Quoc Tuan Vutvu.tuan@gmail.comMeng-Syuan WuMeng-Syuan@gmail.comThanh Tung Buitungbt@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vnChun-Ping JenChun-Ping@gmail.com2019-12-09T05:54:24Z2019-12-09T05:54:24Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3026This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30262019-12-09T05:54:24ZDielectrophoresis enrichment with built-in capacitive sensor microfluidic platform for tumor rare cell detectionThis paper presents a dielectrophoresis (DEP) enrichment microfluidic platform with built-in anti-bodybased capacitive sensor for tumor rare cells detection. We take the advantages of the effective DEP actuation, the high selectivity property of antibody for rare cell immobilization, and the high sensitivity of differential capacitive sensing for quantitatively reading out, to produce advanced platform, toward single tumor cell detection for the rapid laboratory tests of cancers diagnoses and other metabolic diseases applications.Quang Loc Dolocdq@gmail.comThanh Tung Buitungbt@vnu.edu.vnQuoc Tuan Vuvqtuan0211@gmail.comThanh Luan Phamthanhluan@gmail.comThi Thuy Ha Trantttha@gmail.comThanh Van Dauvandt@gmail.comChun Ping Jenpingjen@gmail.comDuc Trinh Chutrinhcd@vnu.edu.vn2018-12-17T03:58:20Z2018-12-17T03:58:21Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3258This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/32582018-12-17T03:58:20ZNovel Apparatus for Simultaneous Monitoring of Electrocardiogram in Awake ZebrafishThis paper reports polymer-based apparatus with embedded flexible thin-film electrodes to monitor electrocardiogram (ECG) of zebrafish under mild or zero anesthesia. The apparatus were made of polydimethylsiloxane (PDMS) using the molding technique with molds formed by 3D printing. The system is capable of acquiring intrinsic ECG from multiple fish simultaneously, thus introducing a novel method to phenotypically assess the hearts’ functionalities, supporting heart regeneration studies, drug screening and other related bioinvestigations using the zebrafish model. Smart algorithms were developed to facilitate data processing and analyses. The recorded ECG was compared with that of the same fish under full sedation and a proof-of-concept 4-chamber system was demonstrated. The process does not require a cleanroom, therefore being cost effective and holding promise to accelerate numerous studies in various disciplines using the zebrafish modelThi Thanh Van Nguyenvanntt@vnu.edu.vnNhu Chi Trantrannhuchi@vnu.edu.vnThanh Tung Buitungbt@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vnAng SherpaMichael LenningPaul MarshNick GarzonPeter HofsteenHung Caohungcao@uw.eduJingchun YangXiaolei Xu2018-12-14T02:01:37Z2018-12-14T02:01:37Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3256This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/32562018-12-14T02:01:37ZPhân tích chẩn đoán bệnh mạch vành dựa trên tín hiệu điện tâm đồĐiện tâm đồ (ECG) ghi lại và biểu thị các xung điện trong quá trình hoạt động của tim. Nghiên cứu các đặc trưng trong tín hiệu điện tâm đồ để phát hiện ra những điểm bất thường của tim có ý nghĩa quan trọng trong lĩnh vực y khoa. Báo cáo này trình bày phương pháp phát hiện hội chứng dày tâm thất và dày tâm nhĩ của tim trên cơ sở phân tích tín hiệu điện tâm đồ kết hợp với các đặc điểm của bệnh. Một chương trình thực hiện tự động phân tích tín hiệu ECG nhằm phát hiện hội chứng dày tâm thất và dày tâm nhĩ đã được phát triển và kiểm chứng với các mẫu tín hiệu ECG. Kết quả kiểm nghiệm cho thấy kết quả chẩn đoán có độ chính xác cao, hứa hẹn khả năng tích hợp chương trình vào thiết bị đo ECG thực hiện sàng lọc và hỗ trợ chẩn đoán tự động.Nhu Chi Trantrannhuchi@vnu.edu.vnThi Thanh Van Nguyenvanntt@vnu.edu.vnVan Chieu Le2018-06-18T16:20:36Z2018-12-17T19:34:29Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3034This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30342018-06-18T16:20:36ZA New Windowed Graph Fourier TransformMany practical networks can be mathematically modeled as graphs. Graph signal processing (GSP), intersecting graph theory and computational harmonic analysis, can be used to analyze graph signals. Just as short-time Fourier transform (STFT) for time-frequency analysis in classical signal processing, we have windowed graph Fourier transform (WGFT) for vertex-frequency analysis in GSP. In this paper, we introduced a new graph modulation operator that satisfies the property of spectral conservation, and a new graph translation operator with interesting properties. Based on these operators, we presented a new method to obtain the WGFT with a tight vertex-frequency frame. These GSP tools were developed based on the graph adjacency matrix. Using time-series graph, USA graph and random graph as examples, we showed by simulation the advantages of our proposed GSP tools over the state-of-the-arts.Trung Thanh Leletrungthanhtbt@gmail.comLinh Trung Nguyenlinhtrung@vnu.edu.vnViet Dung Nguyennvdung@vnu.edu.vnKarim Abed-Meraimkarim.abed-meraim@univ-orleans.fr2018-06-18T03:28:39Z2018-06-18T03:28:39Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3025This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30252018-06-18T03:28:39ZA valveless micropump based on additive fabrication technologyA valveless microfluidic pump fabricated by additive fabrication technology is presented. Nozzle/diffuser structures are used to direct the flow of liquid currents inside the PZT-based micropump. A unique design using the collision of two inlet currents helps reduce the back-flow during the suction phase and promotes mixing ability. The performance of the pump is investigated at different driving frequencies and voltages both computationally and experimentally. Experimental results confirm that the maximum pump pressure reaches approximately 4kPa at 90Hz driving frequency. At resonance frequency, the applied voltage is proportional to the maximum pump pressure. The proposed micropump is suitable for low-cost disposable applications and is capable of delivering a controlled amount of liquid.Van Luan Leetek.luan@gmail.comNhu Cuong Nguyencuongnn241@gmail.comNgoc An Nguyenngocan@vnu.edu.vnThanh Tung Buitungbt@vnu.edu.vnVan Thanh Daudauv@sc.sumitomo-chem.co.jpDuc Trinh Chutrinhcd@vnu.edu.vn2018-06-18T03:27:08Z2018-06-18T03:27:08Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3028This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30282018-06-18T03:27:08ZA symmetrically arranged electrodes for corona discharge anemometryThis paper presents a novel anemometry based on bipolar corona discharge probe with symmetrically arranged parallel electrodes, which is potentially applicable for in-situ measurement. With the proposed configuration, under the existence of the airflow, the decomposed gas is redistributed towards the downstream electrode, and changes the current-voltage characteristics of the system. Experimental study on the anemometry characteristics demonstrates the possibility of measuring a wide range of air flow rate/ flow velocity, i.e., up to 80 l/m.Van Ngoc Tranvanngoc@gmail.comThanh Tung Buitungbt@vnu.edu.vnXuan Thien Dinhthien@cfd.ritsumei.ac.jpTibor Terebessytibor.terebessy@clearviewtraffic.comDuc Trinh Chutrinhcd@vnu.edu.vnVan Thanh Daudauv@sc.sumitomo-chem.co.jp2018-06-13T09:39:11Z2018-06-13T09:39:11Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3016This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/30162018-06-13T09:39:11ZThrough electrode, manufacturing method thereof, and semiconductor device and manufacturing method thereofEmbodiments provided are a through electrode that can be manufactured by a method not including the step of removing a side-wall insulating film formed at the bottom part of the through hole and so having improved electrical characteristics and mechanical reliability and a manufacturing method thereof as well as a semiconductor device and a manufacturing method thereof. A through electrode is disposed in a semiconductor substrate, and includes: a conductive layer; a side-wall insulating film that is disposed between the conductive layer and the semiconductor substrate, the side-wall insulating film being represented by the following chemical formula (1), and a tubular semiconductor layer disposed between the conductive layer and the semiconductor substrate, the semiconductor layer including a same material as the material of the semiconductor substrate.Masahiro Aoyagim-aoyagi@aist.go.jpThanh Tung Buitungbt@vnu.edu.vnNaoya Watanabenaoya-watanabe@aist.go.jpKatsuya Kikuchik-kikuchi@aist.go.jpWei Fengwei.feng@aist.go.jp2018-06-08T08:40:05Z2018-06-08T08:40:05Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2972This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/29722018-06-08T08:40:05ZA compact microfluidic chip with integrated impedance biosensor for protein preconcentration and detectionIn this study, a low-cost, compact biochip is designed and fabricated for protein detection. Nanofractures formed by self-assembled gold nanoparticles at junction gaps are applied for ion enrichment and depletion to create a trapping zone when electroosmotic flow occurs in microchannels. An impedance measurement module is implemented based on the lock-in amplifier technique to measure the impedance change during antibody growth on the gold electrodes which is caused by trapped proteins in the detection region. The impedance measurement results confirm the presence of trapped proteins. Distinguishable impedance profiles, measured at frequencies in the range of 10–100 kHz, for the detection area taken before and after the presence of proteins validate the performance of the proposed system.Tuan Vu Quocvqtuan0211@gmail.comMeng-Syuan WuMeng-Syuan@gmail.comTung Thanh Buitungbt@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vnChun-Ping JenChun-Ping@gmail.com2018-01-12T02:00:47Z2018-01-12T02:00:58Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2912This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/29122018-01-12T02:00:47ZRNN on Machine Reading Comprehension Bi-Directional Attention Flow modelAlthough end-to-end deep neural network have gained popularity in the last few years and have been successful in several Natural Language Processing tasks, reading comprehension remains a challenging one. In this report, we presents in details the popular Bi-Directional Attention Flow model which represents the context at different level and combined the context-to-query and query-to-context direction attention. All necessary background knowledge of general Recurrent Neural Network is also discussed.Hong-Thinh Nguyenhongthinh.nguyen@vnu.edu.vn2018-01-09T03:32:22Z2018-01-09T03:32:22Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2904This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/29042018-01-09T03:32:22ZReconfigurable Network-on-Chip Solution for Complex SystemsVan Thanh Vu Levulvt@husc.edu.vn2018-01-03T07:23:08Z2018-01-03T07:23:08Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2845This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/28452018-01-03T07:23:08ZPhân tích chẩn đoán bệnh mạch vành
dựa trên tín hiệu điện tâm đồĐiện tâm đồ (ECG) ghi lại và biểu thị các xung điện trong quá trình hoạt động của tim.
Nghiên cứu các đặc trưng trong tín hiệu điện tâm đồ để phát hiện ra những điểm bất thường của
tim có ý nghĩa quan trọng trong lĩnh vực y khoa. Báo cáo này trình bày phương pháp phát hiện hội
chứng dày tâm thất và dày tâm nhĩ của tim trên cơ sở phân tích tín hiệu điện tâm đồ kết hợp với
các đặc điểm của bệnh. Một chương trình thực hiện tự động phân tích tín hiệu ECG nhằm phát
hiện hội chứng dày tâm thất và dày tâm nhĩ đã được phát triển và kiểm chứng với các mẫu tín hiệu
ECG. Kết quả kiểm nghiệm cho thấy kết quả chẩn đoán có độ chính xác cao, hứa hẹn khả năng
tích hợp chương trình vào thiết bị đo ECG thực hiện sàng lọc và hỗ trợ chẩn đoán tự động.Nhu Chi Tranchitn@vnu.edu.vnThi Thanh Van Nguyenvanntt@vnu.edu.vnVan Chieu Lelechieu@vnu.edu.vn2017-12-29T09:16:06Z2017-12-29T09:16:06Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2861This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/28612017-12-29T09:16:06ZỨng dụng bộ lọc tối ưu nhằm nâng cao độ chính xác trong định vị thiết bị khảo sát trên biểnPhương pháp định vị sử dụng sóng âm hiện nay đang là một trong những phương pháp tối ưu nhất được sử dụng để xác định hình dạng và vị trí các vật thế dưới mặt nước. Nguyên tắc chung để xác định vị trí của vật thể là dựa vào thời gian từ lúc phát tín hiệu tới khi nhận được tín hiệu phản hồi từ vật thể và tốc độ truyền sóng âm trong môi trường nước, để xác định khoảng cách từ nguồn phát sóng âm chủ động tới vật thể cần khảo sát. Với mỗi ứng dụng người ta sử dụng hệ thống có chiều dài đường cơ sở khác nhau. Có rất nhiều nguyên nhân gây ra sai số thông tin định vị như sai số vận tốc âm thanh, sai số do góc thu của các cảm biến... Bài báo này đề cập tới phương pháp giảm các sai số nói trên sử dụng bộ lọc Kaman trong định vị thiết bị khảo sát với hệ thống chiều dài cơ sở cực ngắn (USBL). Phương pháp này dùng kết quả từ phương pháp định vị thủ công kết hợp các giá trị điều chỉnh từ bộ lọc để khắc phục những sai số khi hệ thống USBL bị gián đoạn. Giải pháp đã được kiểm chứng sử dụng dữ liệu thực nghiệm cho kết quả cải thiện vị trí đáng kể.Tien Nguyen Xuanxuantien.bkfet@gmail.comAnh Nguyen Tienanhnt007@gmail.comToan Nguyen Vannguyenvantoan.k51@gmail.comTu Vuong Haituv296@aol.comDuc Tan Trantantd@vnu.edu.vn2017-12-26T07:00:28Z2017-12-26T07:00:28Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2796This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27962017-12-26T07:00:28ZEnhancing WiFi based Indoor Positioning by Modeling Measurement Data with GMMAbstract—Recently, indoor positioning has been investigated by many research groups. Several proposals for indoor positioning have been developed over the last decades, amongst them, WiFi fingerprinting based is considered as the most promissing approach. However, many challenges are still remained for improving the accuracy of indoor mobile object localization. This paper presents a novel approach for enhancement of WiFi fingerprinting based indoor positioning by using Gaussian Mixture Model (GMM) to model the measured Received Signal Strength Index (RSSI) distributions. Since the measured data
varies due to obstacles in indoor environments as well as user directions, the proposed approach is able to model the data distribution more precise than the previous popular approach which utilizes single Gaussian. Simulation results demonstrate the effectiveness of the proposed approach compared to the others.Manh Kha Hoangkhamh@gmail.comThi Hang Duongduongthihang.haui@gmail.comTrung Kien Vukienvt@gmail.comAnh Vu Trinhvuta@vnu.edu.vn2017-12-26T06:14:07Z2018-01-05T07:15:30Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2786This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27862017-12-26T06:14:07ZĐIỀU KHIỂN CÔNG SUẤT ĐƯỜNG XUỐNG CHO DUNG LƯỢNG NGƯỜI DÙNG ĐỒNG ĐỀU TRONG HỆ THỐNG MASSIVE MIMO ĐƠN TẾ BÀOBài báo đề xuất kỹ thuật điều khiển công suất đường xuống nhằm làm cho dung lượng người dùng đồng đều trong hệ thống Massive MIMO đơn tế bào sau khi xây dựng các biểu thức tính toán phẩm chất kênh. Khác với những nghiên cứu về điều khiển công suất phức tạp nhằm tối ưu hệ thống với những điều kiện ràng buộc khác nhau, bài báo này đề xuất một kỹ thuật đơn giản chỉ nhắm đến mục tiêu là cung cấp dung lượng người dùng bình đẳng khi ràng buộc công suất tổng tại trạm cơ sở không đổi, đó là chỉ cần phân công suất tỷ lệ nghịch với suy giảm đường truyền. Ngoài ra một số liên hệ cơ bản khi thiết kế hệ thống cũng được rút ra. Kết quả mô phỏng cho thấy hiệu quả của phương pháp đề xuất này.Anh Vu Trinhvuta@vnu.edu.vnThi Quynh Trang Phamtrangptq@gmail.comTrung Nghia Phungptnghia@ictu.edu.vn2017-12-22T23:40:51Z2017-12-22T23:40:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2844This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/28442017-12-22T23:40:51ZA Robust Mobile Robot Navigation System using Neuro-Fuzzy Kalman Filtering and Optimal Fusion of Behavior-based Fuzzy ControllersThis study proposes a control system model for mobile robots navigating in unknown environments. The proposed model includes a neuro-fuzzy Extended Kalman Filter for localization task and a behaviorbased fuzzy multi-controller navigation module. The neuro-fuzzy EKF, used for estimating the robot’s position from sensor readings, is an enhanced EKF whose noise covariance matrix is progressively adjusted by a fuzzy neural network. The navigation module features a series of independently-executed fuzzy controllers, each deals with a specific navigation sub-task, or behavior, and a multi-objective optimizer to coordinate all behaviors. The membership functions of all fuzzy controllers play the roles of objective functions for the optimizer, which produces an overall Pareto-optimal control signal to drive the robot. A number of simulations and real-world experiments were conducted to evaluate the performance of this model.Thi Thanh Van Nguyenvanntt@vnu.edu.vnVu Ha Lehalv@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2017-12-14T08:09:46Z2017-12-14T08:09:46Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2742This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27422017-12-14T08:09:46ZCircular electrodes stepping manipulation platform for A549 cancer cell detectionIn this paper, a novel design of an impedance sensor integrated on stepping dielectrophoresis manipulation platform for biological cells detection is presented. The platform consists of fluidic working chamber and manipulating/sensing gold electrodes. Gold electrodes are patterned on glass substrate and protected by an insulating layer to avoid the direct contact between metal electrodes and electrolyte. The outer circular electrodes implement hiological cell manipulating function while the inner electrodes construct sensing electrodes pair which are connected to an impedance analyzer to detect the appearanceo of biological cells on the sensing area. Several experiments have been implemented to investigate the performance of trapping A549 cell line based on aptamer immobilization on gold surface, and impedance spectroscopy readout method.Quang Loc Dolocdq@gmail.comThu Trang Nguyennguyenthutrang.k55@hus.edu.vnThanh Tung Buitungbt@vnu.edu.vnThi Thuy Ha Trantttha@gmail.comVan Chieu Levanchieu@gmail.comThi Thuong Lan Vovothithuonglan@hus.edu.vnThi My Nhung Hoanghoangthimynhung@hus.edu.vnChun-Ping JenChun-Ping@gmail.comDuc Trinh Chutrinhcd@vnu.edu.vn2017-12-08T07:21:37Z2017-12-08T07:21:37Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2746This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27462017-12-08T07:21:37ZAccurate and Low Complex Cell Histogram Generation by Bypass the Gradient of Pixel ComputationHistogram of Oriented Gradient (HOG) is a popular
feature description for the purpose of object detection. However, HOG algorithm requires a performance system because of its complex operation set. Especially, the cell histogram generation is one of the most complex part, it uses inverse tangent, square, square root, floating point multiplication. In this paper, we propose an accurate and low complex cell histogram generation by bypass the gradient of pixel computation. It employs the bin’s
boundary angle method to determine the two quantized angles. However, instead of choosing an approximate value of tan, the nearest greater and the nearest smaller of each tan values from ratio between pixel’s derivative in y and x direction are used. Magnitude of two bins are solutions of a system of two equations, which represent the equality of the gradient of a pixel and its two bins in both vertical and horizontal direction. The proposed
method spends only 30 addition and 40 shift operations to identify two bins of a pixel. Simulation results show that the percentage error when reconstructing the difference in x and y direction are always less than 2% with 8-bit length of the fractional part. Additionally, manipulating the precision of gradient magnitude is very simple by pre-defined sine and cosine values of quantized angles. Synthesizing the hardware implementation presents that
its area cost is 3.57 KGates with 45nm NanGate standard cell library. The hardware module runs at the maximum frequency of 400 MHz, and the throughput is 0.4 (pixel/ns) for a single module. It is able to support about 48 fps with 4K UHD resolution.Huy Hung Hohhhung96@gmail.comNgoc Sinh Nguyensinhnn_55@vnu.edu.vnDuy Hieu Buihieubd@vnu.edu.vnXuan Tu Trantutx@vnu.edu.vn2017-12-08T03:27:18Z2017-12-08T03:27:18Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2745This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27452017-12-08T03:27:18ZEfficient Binary Arithmetic Encoder for HEVCwith Multiple Bypass Bin ProcessingThe increasing amount of digital video with supreme quality requires more efficient compression. As the complexity of video coding algorithm is rising, there are more demands for hardware accelerators and customized hardware. Context-based Adaptive Binary Arithmetic Coding (CABAC) is the only entropy coding method adopted in the latest video compression standard, High Efficiency Video Coding (HEVC). Binary Arithmetic Encoder (BAE) is an essential component in CABAC, where the compression process happens. Because of the high data dependency and sequential coding characteristic, it is challenging to parallelize BAE. In this work, we proposed a low-cost and high-throughput hardware architecture for one core of BAE in HEVC. Our 4-stage pipelined BAE architecture is capable of processing one regular bin and up to 4 bypass bins per clock cycle with 30% reduction in terms of area when compared with the designs for one-core CABAC architecture. The design can compress an average of 1.4 bins per cycle. It achieves a throughput of 1 Gbin/s at the maximum operating frequency of 810 MHz with the area of 2.2 kGEs and the power consumption of 2.0 mW in Nangate 45nm technology.Quang Linh Nguyennqlinh.95@gmail.comDinh Lam Tranlamtdvdt@gmail.comDuy Hieu Buihieubd@vnu.edu.vnDuc Tho Maimaiductho071@gmail.comXuan Tu Trantutx@vnu.edu.vn2017-12-08T03:22:03Z2017-12-08T03:22:03Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2744This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27442017-12-08T03:22:03ZAn IDPSO Algorithm-based Application Mapping Method for Network-on-ChipsApplication mapping is one of the most challenging issues in designing Network-on-Chips, playing an important role in maximizing the performance of NoC based systems. This paper presents a novel method to map applications onto a targeted NoC architecture using Improved Discrete Particle Swarm Optimization (IDPSO) algorithm. The NOXIM platform has been used to evaluate the efficiency of the proposed method in terms of latency, throughput, and power energy. The obtained results show that the proposed method can help the designers to get better performance for NoC based systems. This information is very useful for designers to decide how they should do in the next steps of designing a real-time system.Van Nam Dinhdvnam@ictu.edu.vnKiem Hung Nguyenkiemhung@vnu.edu.vnMinh Trien Phamtrienpm@vnu.edu.vnXuan Tu Trantutx@vnu.edu.vn2017-12-05T15:03:28Z2018-01-10T07:58:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2743This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27432017-12-05T15:03:28ZA frequency dependent investigation of complex shear modulus estimationMechanical properties of tissues in terms of elasticity and viscosity provide us useful information which may be used in detecting tumors. Shear wave imaging (SWI) is a new method to quantify tissue elasticity by estimating the parameters of the complex shear modulus (CSM). The shear wave is generated by a vibrating needle at a certain frequency. In fact, CSM is a function of the vibrating frequency. Therefore, in this paper, a frequency dependent investigation of CSM will be carried in order to evaluate the estimation performance. The Extended Kalman Filter (EKF) is designed to estimate the CSM for both homogeneous and heterogeneous mediums. The root mean square (rms) error is used to evaluate the quality of the CSM estimation. Several tests were implemented to determine the range of vibrating frequency should be used for the good estimation.Quang Hai Luongluonghai@mta.edu.vnManh Cuong Nguyennmcuong@mta.edu.vnDuc Tan Trantantd@vnu.edu.vn2017-12-05T06:27:06Z2017-12-05T06:27:06Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2740This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27402017-12-05T06:27:06ZNovel Apparatus for Simultaneous Monitoring of
Electrocardiogram in Awake ZebrafishThis paper reports polymer-based apparatus with embedded flexible thin-film electrodes to monitor electrocardiogram (ECG) of zebrafish under mild or zero anesthesia. The apparatus were made of polydimethylsiloxane(PDMS) using the molding technique with molds formed by 3D printing. The system is capable of acquiring intrinsic ECG from multiple fish simultaneously, thus introducing a novel method to phenotypically assess the hearts’ functionalities, supporting heart regeneration studies, drug screening and other related bio-investigations using the zebrafish model. Smart algorithms were developed to facilitate data processing and analyses. The recorded ECG was compared with that of the same fish under full sedation and a proof-of-concept 4-chamber system was demonstrated. The process does not require a cleanroom, therefore being cost effective and holding promise to accelerate numerous studies in various disciplines using the zebrafish model.Ang SherpaDaniel SchossowMichael LenningPaul MarshNick GarzonPeter HofsteenHung CaoJingchun YangXiaolei XuThi Thanh Van Nguyenvanntt@vnu.edu.vnNhu Chi Trantrannhuchi@gmail.comThanh Tung Buitungbt@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vn2017-12-04T06:46:29Z2017-12-04T06:46:29Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2737This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27372017-12-04T06:46:29ZAn Online Distributed Boundary Detection and Classification Algorithm for Mobile Sensor NetworksWe present a novel online distributed boundary detection and classification algorithm in order to improve accuracy of boundary detection and classification for mobile sensor networks. This algorithm is developed by incorporating a
boundary detection algorithm and our newly proposed boundary error correction algorithm. It is a fully distributed algorithm based on the geometric approach allowing to remove boundary errors without recursive process and global synchronization. Moreover, the algorithm allows mobile nodes to identify their states corresponding to their positions in network topologies,
leading to self-classification of interior and exterior boundaries of network topologies. We have demonstrated effectiveness of this algorithm in both simulation and real-world experiments and proved that the accuracy of the ratio of correctly identified nodes over the total number of nodes is 100%.Duy Hung Phamhungpd@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vnTrung Dung Ngodungnt@ieee.org2017-12-04T02:59:35Z2017-12-04T02:59:35Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2724This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27242017-12-04T02:59:35ZCoplanar differential capacitively coupled contactless conductivity detection (CD-C4D) sensor for micro object inside fluidic flow recognizationIn this paper, we present a coplanar differential capacitively coupled contactless conductivity detection (CD-C4D) structure for the detection of tiny objects with dimension in micro scale. The differential capacitance changed due to the occurrence of an object in micro scale in is detected and used to recognize the presence as well as properties (i.e., electrical property and moving speed) of the object in fluidic flow. The experimental results and discussion in this paper can be generalized to any living cell or particle detection applications.Thi Thuy Ha Trantttha@gmail.comDo Quang Dolocdq@hus.edu.vnVan Thanh Dauthanhvan@gmail.comThi Kim Ngan Nguyenkimngan@gmail.comVan Chieu Levanchieu@gmail.comMasahiro Aoyagim-aoyagi@aist.go.jpKatsuya Kikuchik-kikuchi@aist.go.jpThanh Tung Buitungbt@vnu.edu.vn2017-12-04T02:57:53Z2017-12-04T02:57:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2735This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27352017-12-04T02:57:53ZCorona anemometry using dual pin probeIn this paper, we present an experimental study on the anemometry characteristics of a bipolar corona discharge probe with symmetrically arranged parallel electrodes. The possibility of measuring a wide range of air flow rate/flow velocity has been demonstrated. The parallel pin probe simultaneously creates positive and negative corona discharge, decomposes air media at both electrodes while keeping them with charge balance ensured by the use of a single isolated power source. This feature is fundamentally different from other reported unipolar discharge configurations, where the decomposed gas and charge is created from single electrode. Under the existence of the air flow, the decomposed gas is redistributed towards the downstream electrode, and changes the current–voltage characteristics of the system. When the probe is in open space, the discharge current is reduced with increasing flow velocity. In constrained space the discharge current behaviour is similar at high flow rates above 25 l min−1, while at low flow rates this relation is reversed. In addition, the sensitivity of discharge current to change in air flow is much higher when the negative pin is placed downstream. Both open space and constrained space characteristics are explained in terms of the influence of external flow on the ozone distribution and its effect on the discharge current. This explanation is supported by ozone measurements, with the data showing good correlation between the discharge current and ozone concentration with respect to the external flow. The role of the electrode separation and discharge voltage is also investigated.Van Thanh Dauvandt@gmail.comThien Xuan Dinhthien@cfd.ritsumei.ac.jpThanh Tung Buitungbt@vnu.edu.vnTibor Terebessytibor.terebessy@clearviewtraffic.com2017-12-04T02:57:07Z2017-12-04T02:57:07Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2729This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27292017-12-04T02:57:07Z30-GHz High-Frequency Application of Screen Printed Interconnects on an Organic SubstratePrinted conductive traces on flexible substrates offer many potential applications in the area of wearable electronics, ranging from search and rescue operations to health and physiological monitoring. The literature abounds on the effect of sintering conditions on the dc electrical resistivity of printed traces, due to the applications considered which fall in the lower frequency domain (megahertz range). There is a growing interest to investigate wireless body area networks for wearable electronics operating in the higher frequencies, due to the advantages involved. At present, there is a little information available on the radio frequency performance of printed interconnects, and this work seeks to investigate the effect of the paste property on the dc conductivity and high-frequency performance ( $\textbackslashle 30$ GHz) of interconnects. The results obtained suggest that paste leveling has a significant influence on the dc electrical performance. In addition, the dc conductivity values are possibly affected by the adhesion of the paste onto the particular substrate during the printing process, which was observed to have a significant effect on the quality and thicknesses of the traces printed. Last, the influence of the dc conductivity on the high-frequency performance of interconnects is investigated, where the measured results are validated with simulation results.Ying Ying Limyingying.lim@aist.go.jpYee Mey GohManabu YoshidaThanh Tung Buitungbt@vnu.edu.vnMasahiro AoyagiChangqing Liu2017-12-04T02:54:07Z2017-12-04T02:54:07Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2722This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27222017-12-04T02:54:07ZComputational and experimental study on ion wind scheme based aerosol sampling for biomedical applicationsIn this paper, an efficient electrostatic particle sampling system is developed based on the neutralized ion wind. Compare with the conventional schemes where unipolar ion is used to charge the airborne sample and the sampling stage is fixed as a part of high voltage circuit, the new approach allows sampling stage to be electrically floated and adds insignificant charge to the bioaerosol, thus reduces damages to the microorganisms while provides design flexibility and good collecting efficiency. The approach is suitable for the combination with a microfluidic interface to develop complex aerosol-to-hydrosol bio-samplers.Thanh Tung Buitungbt@vnu.edu.vnThien Xuan Dinhthien@cfd.ritsumei.ac.jpCanh Dung Trancanhdung@gmail.comDuc Trinh Chutrinhcd@vnu.edu.vnVan Thanh Daudauv@sc.sumitomo-chem.co.jp2017-12-04T02:53:33Z2017-12-04T02:53:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2721This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27212017-12-04T02:53:33ZIonic JET flow in a circulatory miniaturized systemThis paper reports a novel device for generating circulatory jet flow using bipolar discharge configuration. This arrangement, in which two electrodes serve as mutual emitters and reference defining the electric field, allows to generate simultaneously ionic wind with opposite charge, thus the ion flow is self-neutralized while keeping the momentum in desired direction. In order to prevent system from sparking over, between the two parallel electrodes is installed one millimetre thick polypropylene wall. Experiment and simulation has shown that the air flow is successfully circulated in the confined device with peak velocity of 2 m/s while consuming only 33 mW.Lam Bao Danglambao@gmail.comThien Xuan Dinhthien@cfd.ritsumei.ac.jpThanh Tung Buitungbt@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vnHoa Thanh Phanhoathanh@gmail.comVan Thanh Daudauv@sc.sumitomo-chem.co.jp2017-12-03T11:55:09Z2017-12-03T11:55:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2728This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27282017-12-03T11:55:09ZAnalytical modeling of a silicon-polymer electrothermal microactuatorThis paper illustrates both thermal and mechanical analysis methods for displacement and contact force calculating of a novel sensing silicon-polymer microgripper when heat sources are applied by an electric current via its actuators. Thermal analysis is used to obtain temperature profile by figuring out a heat conductions and convections model. Temperature profile is then applied into the mechanical structure of the gripper's actuators to form the final equation of displacement and contact force of the jaws. Finally, the comparison among the calculation, simulation and actual measurement concludes that materialization methods are appropriate. Achieving the final equation of gripper's jaws displacement and contact force is a major step to optimize or reform this novel structure for different sizes to meet specific applications.Huu Phu Phanphanhuuphu82@gmail.comMinh Ngoc Nguyenminhngoc@gmail.comNgoc Viet Nguyenvietnn.mt@gmail.comDuc Trinh Chutrinhcd@vnu.edu.vn2017-12-03T11:53:14Z2017-12-03T11:53:14Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2731This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27312017-12-03T11:53:14ZMethod of manufacturing semiconductor device and semiconductor device manufacturing apparatusA method of manufacturing a semiconductor device according to the present invention comprises:
a bump forming step of forming a bump electrode 100 on a semiconductor chip 1, the bump electrode 100 protruding in a substantially conical shape;
a pad forming step of forming a pad electrode 200 on a substrate 10, the pad electrode 200 having a recess 210 with inner lateral surfaces thereof defining a substantially pyramidal shape or a prism shape;
a pressing step of pressing the bump electrode 100 and the pad electrode 200 in a direction which brings them closer to each other, with the bump electrode 100 being inserted in the recess 210 so that the central axis of the bump electrode 100 and the central axis of the recess 210 coincide with each other; and
an ultrasonic joining step of joining the bump electrode 100 and the pad electrode 200 by vibrating at least one of the bump electrode 100 and the pad electrode 200 using ultrasonic waves.Masahiro Aoyagim-aoyagi@aist.go.jpThanh Tung Buitungbt@vnu.edu.vnMotohiro SuzukiMotohiro@gmail.comNaoya Watanabenaoya-watanabe@aist.go.jpFumiki KatoFumiki@gmail.comLai Na MaLaiNa@gmail.comShunsuke NemotoShunsuke@gmail.com2017-12-03T11:17:15Z2017-12-05T06:29:01Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2718This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/27182017-12-03T11:17:15ZLiquid identification by using a micro-electro-mechanical interdigital transducerA surface-acoustic-mode aluminum nitride (AlN) transducer is utilized to determine the type of liquid dropped on the propagation path. It is based on tracking the shrinking droplet radius and observing stagnant liquid molecules during and after the liquid evaporation process. The device configuration is suitable to test small amounts of liquids, in the microliter range. According to both mass loading and physical property mechanisms, eight samples of liquids, isopropanol (IPA), ethanol (ETH), deionized-water (DW), tap water (TW), heptane (HEP), propylene glycol monomethyl ether acetate (PGMEA), hexamethyldisilazane (HMDS) and acetone (ACE), which have different equilibrium vapor pressures, molecular weights and boiling points, are accurately detected. The experimental results show that the rate of the change in the energy loss including a slow and fast attenuation region depends on the change of physical properties, such as density, sound speed in liquids and evaporation rate, during the evaporation process. As the evaporation rate of the DW is rather slow, the slow attenuation region occurs for a longer time than the fast one. Consequently, the whole oscillation duration of the attenuation occurs for a longer time, whereas that of the other liquids studied, like ACE, ETH, and IPA, having a faster evaporation rate is shorter. Sensitivities of the surface-acoustic-mode transducer to the evaporation process of liquids such as DW, TW, PGMEA, HMDS, HEP, IPA, ETH and ACE are -29.39, -29.53, -31.79, -34.12, -33.62, -32.87, -32.67, and -32.82 dB small mu m-2{,} respectively. The concentration of stagnant liquid molecules causes a change in the surface mass of the micro-electro-mechanical transducer{,} which causes a frequency shift and increases the signal noise at the receiver after the liquid evaporation process. The average frequency shifts of ACE{,} HEP{,} HMDS{,} ETH{,} IPA{,} PGMEA{,} TW and DW are 241{,} 206{,} 172{,} 117{,} 76{,} 27.3{,} 11.6 and 0 kHz{,} respectively{,} coherent with the type of formed liquid pattern on the device surface{,} thus allowing to detect liquid samples effectively.Thu Hang BuiT.H.Bui@tudelft.nlBruno Moranamorana@gmail.comAtef Akhnoukhakhnoukh@gmail.comDuc Chutrinhcd@vnu.edu.vnPasqualina M. Sarrosarro@gmail.com2017-12-02T13:57:24Z2017-12-13T01:57:56Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2665This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26652017-12-02T13:57:24ZPerformance Evaluation of Frame Loss Error Concealment Solutions for SHVC standardScalable High Efficiency Video Coding (SHVC) has been emerging as one of the efficient video coding solutions for adaptive video streaming and conferencing. SHVC is designed with a layered coding structure in which the High Efficiency Video Coding (HEVC) tools are employed as core elements. However, the compression efficiency and the error sensitivity associated to efficient HEVC tools make this scalable codec less attractive to practical video transmission, especially when the loss of packets or video frames occurs. This problem introduces severe impacts to the displayed quality of received video. To address this problem, we propose efficient error concealment (EC) methods that conceal the whole frame lost and mitigate the error propagation problem occurred in practical video transmission using SHVC. The presented EC methods mainly rely on the decoded information; thus, it is easy to be integrated into the SHVC decoder as a post-processing component. The experimental results obtained for both subjective and objective quality assessments shown that, the inter-layer correlation based EC approach typically provides the highest concealed frame quality; thus, it is highly recommended for practical video transmission.Thuc Nguyen Huubjeon@skku.eduDuong Dinh Trieuduongdt@vnu.edu.vnJeon Byeungwoobjeon@skku.eduXiem Hoang Vanxiemhoang@vnu.edu.vn2017-11-22T09:44:11Z2018-01-10T07:50:47Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2674This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26742017-11-22T09:44:11ZFlexible Configuration of Wireless Sensor Network for Monitoring of Rainfall-Induced LandslideEstablishment of wireless sensor network for Monitoring and Early Warning System (MEWS) of rainfall-induced landslide is still a challenging task due to problems of energy consumption. This research aim is to propose a new flexible system for the configuration of MEWS for rainfall-induced landslides. The proposed system is an integration a star topology and a tree topology, in which, the star topology is automatically used for the sensor nodes around the gateway node, whereas the tree topology is adopted for the other nodes. Consequently, the proposed configuration method is flexible and capable to save the energy consumption in the MEWS. Experiment result showed that the performance of the MEWS with the proposed method Wireless Sensor Network is better than those from the systems only use the tree topology or the star topology. The result of this study is useful for designing WSN for MEWS of rainfall-induced landslides.Quoc Anh Giangianquocanh@gmail.comDuc Tan Trantantd@vnu.edu.vnDinh Chinh Nguyenchinhnd@vnu.edu.vnTien Dieu BuiBuiTienDieu@gmail.com2017-11-21T22:11:58Z2018-01-10T07:58:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2664This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26642017-11-21T22:11:58ZDesign and implementation of site-specific rainfall-induced landslide early warning and monitoring system: a case study at Nam Dan landslide (Vietnam)ABSTRACTThis paper proposes and implements an early warning and monitoring system for rainfall-induced landslide (named as EWMRIL) with a case study at the Nam Dan landslide (northern Vietnam). The proposed system consists of six sensor nodes and one rainfall station that are used to sense large amounts of data in real-time such as soil moisture, pore-water pressure (PWP), movement status, and rainfall. In addition, a new flexible configuration for the wireless communication system is proposed that is capable not only to save the energy consuming but also to ensure the reliability of the system. Using wireless communication system, the sensed data were sent to the computer station for analyzing and predicting the instability of the landslide in terms of factor of safety (FoS) using the finite element seepage analysis and the limit equilibrium slope stability analysis methods. These methods are available in the SEEP/W and SLOPE/W modules of the GeoStudio software. Based on the analyzing results, the system proposed three warning levels for the landslide Early, Intermediate, and Imminent. Experiment result in the rainy season from August to September 2016 has proven the validity of the EWMRIL system. The result of this study is useful for landslide risk prevention and management in landslide prone-areas.Quoc Anh Giangianquocanh@gmail.comDuc Tan Trantantd@vnu.edu.vnDinh Chinh Nguyenchinhnd@vnu.edu.vnViet Ha Nhuvietha.nhu@gmail.comTien Dieu BuiBuiTienDieu@gmail.com2017-11-16T14:16:32Z2017-12-05T06:22:08Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2662This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26622017-11-16T14:16:32ZDesign of LMS Based Adaptive Beamformer for ULA AntennasThis paper proposes a design of an adaptive beamformer for arbitrarily uniformly spaced array (ULA) antennas. Least Mean Square (LMS), a prevalent adaptive beamforming algorithm, has been employed in the beamformer for the ULA antennas. A procedure has been introduced to validate the proposed design. Applying the proposal, a LMS based adaptive beamformer for 8×1 ULA antennas has been built and implemented on Xilinx FPGA. The fundamental characteristics of the implemented beamformer have been measured and verified. The experimental results show that the beamformer is capable of creating appropriate weights in order to steer the main lobe of the ULA antennas to the desired direction and to place simultaneously null points towards the interferences in case of NOAA LEO satellites system.Van Luyen Tongtvluyen@gmail.comVu Bang Giang Truonggiangtvb@vnu.edu.vn2017-11-16T04:28:49Z2020-02-03T06:57:32Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2635This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26352017-11-16T04:28:49ZA Survey on Reconfigurable System-on-ChipsThe requirements for high performance and low power consumption are becoming more and more inevitable when designing modern embedded systems, especially for the next generation of multi-mode multimedia or communication standards. Ultra large-scale integration reconfigurable System-on-Chips (SoCs) have been proposed to achieve not only better performance and lower energy consumption but also higher flexibility and versatility in comparison with the conventional architectures. The unique characteristic of such systems is the integration of many types of heterogeneous reconfigurable processing fabrics based on a Network-on-Chip. This paper analyzes and emphasizes the key research trends of reconfigurable System-on-Chips (SoCs). Firstly, the emerging hardware architecture of SoCs is highlighted. Afterwards, the key issues of designing reconfigurable SoCs are discussed, with the focus on the challenges when designing reconfigurable hardware fabrics and reconfigurable Network-on-Chips. Finally, some state-of-the-art reconfigurable SoCs are briefly discussed.Kiem Hung Nguyenkiemhung@vnu.edu.vnVan Thanh Vu Levulvt@husc.edu.vnXuan Tu Trantutx@vnu.edu.vn2017-11-15T08:16:02Z2017-12-12T08:23:06Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2656This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26562017-11-15T08:16:02ZA Color Space Exploration in Optical Spatial ModulationIn order to increase spectrum efficiency, twodimensional signal space in conventional modulation schemes is
expanded by LED transmitter indices in the Optical Spatial Modulation (OSM) scheme, and a combination of transmitter and modulation indices in the Index-based Optical Spatial Modulation (IOSM) scheme. In this paper, we proposed a novel Spatial Modulation called Optical Color-Transmission modes Index-based Spatial Modulation scheme (OCTI-SM) which explore one more dimension – color dimension by using white Laser Diode (LD) light bulb which consists of four color laser sources. With the color space exploration, the proposed scheme achieves higher data rate than the SM schemes. Using computer simulations and mathematical analysis, the system performance of the proposed OCTI-SM is compared with the conventional OSM and the IOSM schemes, and results show that the OCTISM achieves a significant improvement in increasing spectral efficiency.Ngoc Tan Nguyennguyen.tan170@gmail.comQuoc Tuan Nguyentuannq@vnu.edu.vnNam Hoang Nguyenhoangnn@vnu.edu.vnKumbesan Sandrasegarankumbesan.sandrasegaran@uts.edu.au2017-11-15T01:59:53Z2017-12-12T08:24:05Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2654This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26542017-11-15T01:59:53ZChannel Reallocation for Reducing Power Consumption in Femtocell Mobile NetworksFuture mobile networks are known to deploy a two-tier architecture of macrocell – femtocell [1]. In the two-tier architecture, femtocell downlink channels can cause strong co-channel interference to downlink transmission of macrocell users (MUs) which use the same frequency. The co-channel downlink interference to the MU might cause the MU’s QoS degradation. To maintain the QoS of the MU’s connection, the serving macro base station (MBS) has to increase the transmission power of the macrocell downlink. The power increment will also cause more co-channel interference to other MUs of the neighbor MBSs thus results in increasing downlink transmission power of the macrocell subsystem. In this paper, we analyze the co-channel downlink interference and then propose downlink channel reallocation schemes, denoted as MBS-sensing and CFAP-sensing schemes, in order to reduce the power consumption of the macrocell subsystem. Simulation results prove that using channel reallocation schemes provide much better downlink power consumption efficiency than the case when the channel reallocation is not deployed. In general, the CFAP-sensing scheme has better performance than the MBS-sensing scheme. However, when femtocells have long coverage radius, the MBS-sensing scheme is the better solution because it is less complex and has similar performance.Xuan Bac Nguyenngxbac.dt@gmail.comNam Hoang Nguyenhoangnn@vnu.edu.vnTakahiko Sabasaba@cs.it-chiba.ac.jp2017-11-13T12:37:31Z2017-12-13T01:58:21Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2631This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26312017-11-13T12:37:31ZFemtocell Selection Scheme for Reducing Unnecessary Handover and Enhancing Downlink QoS in Cognitive Femtocell NetworksFemtocell networks have been proposed for
indoor communications as the extension of cellular networks
for enhancing coverage performance. Because femtocells have
small coverage radius, typically from 15 to 30 meters, a
femtocell user (FU) walking at low speed can still make
several femtocell-to-femtocell handovers during its connection.
When performing a femtocell-to-femtocell handover, femtocell
selection used to select the target handover femtocell has to
be able not only to reduce unnecessary handovers and but
also to support FU’s quality of service (QoS). In the paper,
we propose a femtocell selection scheme for femtocell-tofemtocell handover, named Mobility Prediction and Capacity
Estimation based scheme (MPCE-based scheme), which has
the advantages of the mobility prediction and femtocell’s
available capacity estimation methods. Performance results
obtained by computer simulation show that the proposed
MPCE-based scheme can reduce unnecessary femtocell-tofemtocell handovers, maintain low data delay and improve
the throughput of femtocell users.Dong Hoang Nhuddonghoang93@gmail.comHoang Nguyen Namhoangnn@vnu.edu.vnMinh Hoang Tronghoangtrongminh@yahoo.comTakahiko Sabasaba@cs.it-chiba.ac.jp2017-11-07T16:27:28Z2017-12-05T06:28:11Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2629This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26292017-11-07T16:27:28ZInterference Suppression of ULA Antennas by Phase-only Control Using BAT AlgorithmThis paper proposes an adaptive BAT algorithm (BA) based beamformer for pattern nulling of half-wave Dipole Uniformly Spaced Linear Array (DULA), of which the imposed nulls have been placed at directions of interferences. This pattern nulling is obtained by controlling only the phase of each array element. In order to verify the proposal, several scenarios of DULA pattern with the pre-set nulls have been performed and compared with those of genetic algorithm (GA) and accelerated particle swarm optimization (APSO) considering mutual coupling. The proposed beamformer has shown the ability to suppress side lobes, to maintain predefined beamwidth, to place precisely single, multiple, and broad nulls at an arbitrary direction of interferences. Furthermore, the beamformer is much faster and more effective in terms of null steering and side lobe suppression in pattern synthesis than GA and APSO based ones.Van Luyen Tongtvluyen@gmail.comVu Bang Giang Truonggiangtvb@vnu.edu.vn2017-11-06T21:18:53Z2017-11-06T21:18:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2616This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26162017-11-06T21:18:53ZA 300 GHz single varactor doubler in 40 nm CMOSThis paper presents a 300 GHz single varactor doubler suitable for ultrahigh-speed wireless communications. The proposed varactor doubler realized in TSMC 40 nm CMOS can be integrated with other CMOS components to generate millimetter-wave signals at 300 GHz frequency band. At the pumping frequency of 150 GHz, input power of 10 dBm, the doubler results in an output power of -3.5 dBm at 300 GHz. The doubler consumes no DC power while it occupies a chip area of 0.27 mm2 including probe pads.Tuan Anh Vutanhvu@vnu.edu.vnKyoya Takanokyoya@hiroshima-u.ac.jpMinoru Fujishimafuji@hiroshima-u.ac.jp2017-11-06T14:38:44Z2018-01-10T07:57:59Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2618This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26182017-11-06T14:38:44ZDevelopment of a Real-Time Supported System for Firefighters in Emergency CasesThe firefighters can be injured by unintentional falls during the implementation tasks because of the broken in floors, structure elements; gas bombs; liquid boil ejection and toxic gases... in the fire. Therefore, this paper aims to develop a portable and efficient device to monitor the falls by integrating a micro controller, a 3-DOF (Degrees of Freedom) accelerometer sensor, a MQ7 sensor (Semiconductor Sensor for Carbon Monoxide), a GSM/GPRS (Group Special Mobile/General packet radio service) modem, and the corresponding embedded fall detection algorithms. By developing algorithms and the corresponding simulations to monitor the fall event which can distinguish between being fall and the other daily activities (ADLs) such as standing, walking, running, sitting, lying. The signals from accelerometer are sent to the micro controller to monitor and alert the fall events. The cascade posture recognition is proposed to enhance the fall detection accuracy by determining if the posture is a result of a fall. Furthermore, MQ7 sensor is integrated into the proposed system to confirm the fall directly in emergency situations when air supporting device is working in failure. Based on the detection results, if a person falls with faint, an alert message will be sent to their leader via the GSM/GPRS modem. We had carefully investigated the threshold values (to determine the fall events) and the window size(to determine the time frame for analyzing) by MATLAB. After that, we selected the most suitable values for these parameters to achieve the optimal performance when it is working in emergency places.Thanh Pham Vanphamvanthanh1209@gmail.comNga Nguyen Thi Huyenhuyennga154@gmail.comHa Le Thi Thulethithuha25@gmail.comLam Do Vandolam271094@gmail.comDinh Chinh Nguyenchinhnguyen92tb@gmail.comDuc Tan Trantantd@vnu.edu.vn2017-11-06T05:11:25Z2017-11-06T05:11:25Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2615This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26152017-11-06T05:11:25ZA 300 GHz CMOS Transmitter Front-End for Ultrahigh-Speed Wireless CommunicationsThis paper presents a 300 GHz transmitter front-end suitable for ultrahigh-speed wireless communications. The transmitter front-end realized in TSMC 40 nm CMOS consists of a common-source (CS) based doubler driven by a two-way D-band power amplifier (PA). Simulation results show that the two-way D-band PA obtains a peak gain of 21.6 dB over a -3 dB bandwidth from 132 GHz to 159 GHz. It exhibits a saturated power of 7.2 dBm and a power added efficiency (PAE) of 2.3%, all at 150 GHz. The CS based doubler results in an output power of 0.5 mW at 300 GHz. The transmitter front-end consumes a DC power of 205.8 mW from a 0.9 V supply voltage while it occupies an area of 2.1 mm2.Tuan Anh Vutanhvu@vnu.edu.vnMinoru Fujishimafuji@hiroshima-u.ac.jp2017-11-03T11:26:43Z2017-11-03T11:26:43Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2606This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26062017-11-03T11:26:43ZA closed-form of Cooperative Detection Probability
using EGC-Based Soft Decision under Suzuki FadingIn cooperative spectrum sensing based on energy
detection, several researchers have concluded that Soft Decision has better detection performance than Hard Decision. In this paper, we focus on Equal Gain Combining (EGC)-based soft decision under Suzuki fading which is a composite Rayleighlognormal fading. We use Moment-Generating function (MGF) to approximate Probability Density Function (PDF) of power sum of received signals at Fusion Center. Then we propose a novel method to evaluate cooperative detection performance under the effect of i.i.d Suzuki fading by using Gauss-Hermite
approximation and MGF matching. Finally, we compare the
results of EGC-based Soft Decision with those of Hard Decision.Thi Thai Mai Dinhdttmai@vnu.edu.vnQuoc Tuan Nguyentuannq@vnu.edu.vnKumbesan Sandrasegarankumbesan.sandrasegaran@uts.edu.au2017-11-02T22:28:00Z2018-01-10T07:51:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2605This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26052017-11-02T22:28:00ZEffect of droplet shrinking on surface acoustic wave response in microfluidic applicationsThe effect of the contact angle and radius of a microsize droplet on the surface acoustic wave (SAW) response for microfluidic applications is reported. It is studied through the dynamic change of the droplet shape during the evaporation process. An aluminium nitride SAW device, operating at 125.7 MHz, is utilized to investigate the deformation of the droplet shape (contact angle and contact radius) caused by shrinking. The large cavity placed on the propagation path distorts the in-band SAW response one time at the centre frequency. The fractional coefficient of the SAW insertion loss, before and after dropping the liquid on the propagation path, is continuously recorded. The change in the fractional coefficient shows that the radiated acoustic kinetic energy depends on the contact area between the sessile micro-size droplet and the SAW device more than the contact angle of the droplet. Three droplet volumes have been considered, namely 0.05, 0.1 and 0.13 μl, and the electrical results show a better agreement with the theoretical data than the optical image data. The average duration of the fractional coefficient change for these cases is 420, 573 and 760 s, respectively. The effect of the hydrophobicity versus hydrophilicity of the contact surface on the duration of the fractional coefficient change is studied by coating the SAW with a silicon oxide or hexamethyldisilazane (HMDS) thin layer. For the same 0.05 μl sessile droplet on the hydrophobic surface, this duration is on average 110 s longer than that on the hydrophilic surface.ThuHang Buihangbt@vnu.edu.vnVan Nguyennguyenvan@gmail.comSten VollebregtVollebregt@gmail.comBruno Moranamorana@gmail.comHenk van Zeijlhenkvz@gmail.comDuc Trinh Chutrinhcd@vnu.edu.vnPasqualina M Sarrosarrop@gmail.com2017-11-02T22:11:19Z2018-01-10T08:01:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2604This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26042017-11-02T22:11:19ZQuy trình kết hợp đa tần số hiệu quả trong việc nâng cao chất lượng khôi phục ảnh siêu âm cắt lớpPhương pháp lặp vi phân Born (DBIM) sử dụng thông tin đa tần số đã được nghiên cứu và ứng dụng trong kỹ thuật siêu âm cắt lớp. Tuy nhiên, việc sử dụng các tần số khác nhau ở các vòng lặp khác nhau trong phương pháp DBIM không được sử dụng một cách nhất quán. Bước nhảy tần số thường được lựa chọn tùy thuộc vào người xây dựng kịch bản mô phỏng hay thực nghiệm. Dựa vào kỹ thuật kết hợp đa tần số, trong bài báo này, chúng tôi đề xuất một quy trình kết hợp đa tần số hiệu quả nhằm nâng cao chất lượng khôi phục ảnh siêu âm cắt lớp sử dụng âm cơ bản và các họa âm (FTaOT). Kết quả mô phỏng số chỉ ra rằng, lỗi chuẩn hóa của phương pháp đề xuất giảm 45% so với phương pháp kết hợp hai tần số thông thường. Các kịch bản sử dụng giải pháp kết hợp đa tần số khác cũng được mô phỏng để chứng minh tính khả thi của phương pháp đề xuất.Huy Tran Quangtranquanghuysp2@gmail.comLam Nguyen Thenguyenthelam@hpu2.edu.vnDucTan Trantantd@vnu.edu.vn2017-11-01T21:25:33Z2017-11-01T21:25:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2601This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26012017-11-01T21:25:33ZParameter Sensitivity Analysis in Medical Image Registration Algorithms Using Polynomial Chaos ExpansionsMedical image registration algorithms typically involve numerous user-defined `tuning' parameters, such as regularization weights, smoothing parameters, etc. Their optimal settings depend on the anatomical regions of interest, image modalities, image acquisition settings, the expected severity of deformations, and the clinical requirements. Within a particular application, the optimal settings could even vary across the image pairs to be registered. It is, therefore, crucial to develop methods that provide insight into the effect of each tuning parameter in interaction with the other tuning parameters and allow a user to efficiently identify optimal parameter settings for a given pair of images. An exhaustive search over all possible parameter settings has obvious disadvantages in terms of computational costs and quickly becomes infeasible in practice when the number of tuning parameters increases, due to the curse of dimensionality. In this study, we propose a method based on Polynomial Chaos Expansions (PCE). PCE is a method for sensitivity analysis that approximates the model of interest (in our case the registration of a given pair of images) by a polynomial expansion which can be evaluated very efficiently. PCE renders this approach feasible for a large number of input parameters, by requiring only a modest number of function evaluations for model construction. Once the PCE has been constructed, the sensitivity of the registration results to changes in the parameters can be quantified, and the user can simulate registration results for any combination of input parameters in real-time. The proposed approach is evaluated on 8 pairs of liver CT scans and the results indicate that PCE is a promising method for parameter sensitivity analysis in medical image registration.Gokhan Gunayg.gunay@erasmusmc.nlSebastian van der Voorts.vandervoort@erasmusmc.nlManh Ha Luuhalm@vnu.edu.vnAdriaan Moelkera.moelker@erasmusmc.nlStefan Kleins.klein@erasmusmc.nl2017-11-01T14:00:13Z2017-11-01T14:00:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2599This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25992017-11-01T14:00:13ZSemiautomated registration of pre- and intraoperative CT for image-guided percutaneous liver tumor ablation interventionsGokhan GunayManh Ha LuuAdriaan MoelkerTheo van WalsumStefan Klein2017-10-30T08:12:03Z2017-12-12T08:21:31Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2595This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25952017-10-30T08:12:03ZOn the overall ROC of multistage systemsThe receiver operating characteristic (ROC) curve is a useful tool to evaluate the performance of classifiers, and is widely used in signal detection, pattern recognition and machine learning. For complex object classification, multiple single classifiers are often used and they are concatenated into a multistage classification system. Thus, it is necessary to obtain the overal ROC curve, because the ROC curves of the individual classifiers are not useful for the overall system since it has multi-level decision thresholds. In this paper, a systematic approach was introduced for measuring the performance of multistage systems via estimating the overall ROC curve. Two new ROC models sharing the same properties of classical ROC curves were proposed, inspired by the Gaussian and logistic distributions. The models were then experimented on a recently introduced multistage system for epileptic spike classification from electroencephalogram data. Experimental results indicated that the proposed ROC models can be used for multistage classification systems.Trung Thanh Leletrungthanhtbt@gmail.comThi Anh Dao Nguyendaonta81@gmail.comLinh Trung Nguyenlinhtrung@vnu.edu.vnVu Ha Lehalv@vnu.edu.vn2017-10-30T08:09:37Z2017-10-30T08:09:37Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2596This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25962017-10-30T08:09:37ZMulti-source Data Analysis for Bike Sharing SystemsBike sharing systems (BSSs) have become common in many cities worldwide, providing a new transportation mode for residents’ commutes. However, the management of these systems gives rise to many problems. As the bike pick-up demands at different places are unbalanced at times, the systems have to be rebalanced frequently. Rebalancing the bike availability effectively, however, is very challenging as it demands accurate prediction for inventory target level determination. In this work, we propose two types of regression models using multi-source data to predict the hourly bike pick-up demand at cluster level: Similarity Weighted K-Nearest-Neighbor (SWK) based regression and Artificial Neural Network (ANN). SWK-based regression models learn the weights of several meteorological factors and/or taxi usage and use the correlation between consecutive time slots to predict the bike pick-up demand. The ANN is trained by using historical trip records of BSS, meteorological data, and taxi trip records. Our proposed methods are tested with real data from a New York City BSS: Citi Bike NYC. Performance comparison between SWK-based and ANN-based methods is provided. Experimental results indicate the high accuracy of ANN-based prediction for bike pick-up demand using multi-source data.Thi Hoai Thu NguyenTrung Thanh LeThi Phuong Dung Chudungctp@vnu.edu.vnLinh Trung Nguyenlinhtrung@vnu.edu.vnVu Ha Lehalv@vnu.edu.vn2017-10-29T07:23:52Z2018-01-10T07:57:24Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2593This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25932017-10-29T07:23:52ZAutomatic removal of EOG artifacts using SOBI algorithm combined with intelligent source identification techniqueElectrooculography (EOG) artifacts, generated by winking or other eye’s movements, should be eliminated because they are the cause of the wrong decision in analysis the Electroencephalography (EEG) data, especially in the diagnosis of epilepsy. One of the efficient methods for signal separation is the Second order blind identification (SOBI), a blind source separation technique. In most cases, the activities of the two eyes are the same, and SOBI identify that there is only one source of artifact. However, in some cases, the activities of the two eyes are different, and SOBI identify that there are two different sources of artifacts [1]. The problem is that SOBI cannot provide the information about the order of sources. It means that, it cannot point out how many sources of EOG. It would lead to the wrong decision in EEG analysis. To solve this current limitation, in this paper, we propose an effective method to remove EOG from EEG using SOBI combined with intelligent source identification technique. The proposed method was evaluated carefully using experimental data. It determined successfully the number of EOG sources and removes these artifacts more accurately and efficiently.Thanh Pham Vanphamvanthanh1209@gmail.comDinh Dang Nhudangnhu@gmail.comAnh Nguyen Ducanhnd@gmail.comAnh Nguyen Tienanhnt007@gmail.comHoang Chu Duchoangcd@gmail.comDuc Tan Trantantd@vnu.edu.vn2017-10-29T07:19:31Z2017-12-12T08:16:31Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2592This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25922017-10-29T07:19:31ZDetection and Classification of Soft Tissues using Complex Shear Modulus Estimation and Decision Tree AlgorithmComplex shear modulus (CSM) estimation is an effective facility to analyze the mechanical properties of tissues in terms of elasticity and viscosity. CSM can be used to detect and classify some kinds of soft tissues. However, the challenge is the estimation accuracy, and computational complexity. In this paper, we propose a 2D CSM estimation and classification of soft tissues based on the Extended Kalman Filter (EKF) and the Decision Tree (DT) algorithm. EKF is used to estimate the CSM at each spatial point by exploiting the shear wave propagation. A simple and effective decision tree algorithm is then developed for the classification of three kinds of tissues. Simulated experiment and performance study are carried out to confirm the quality of the proposed method.Quang Ha Luongluonghai@mta.edu.vnManh Cuong Nguyennmcuong@gmail.comDuc Tan Trantantd@vnu.edu.vn2017-10-29T06:59:24Z2017-12-05T06:25:17Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2588This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25882017-10-29T06:59:24ZHEVC based Distributed Scalable Video Coding for Surveillance Visual SystemSurveillance visual systems play an important role in modern life, especially in the Internet of Things (IoTs) era. However, the limitation of bandwidth, energy resources and the heterogeneity of devices, networks and environments have been asking for a more powerful video coding solution, which provides not only the high compression efficiency but also the flexible scalability capability. In this context, we propose a novel scalable video coding solution, particularly designed for surveillance video content, which typically contains low motion and static scenes, thus having high temporal redundancy. In the proposed video coding framework, the conventional video coding standard, i.e., High Efficiency Video Coding (HEVC) is wisely combined with the emerging distributed coding paradigm and following a lay-ered coding approach to exploit the high temporal correlation between frames in surveillance video content. As assessed, the proposed surveillance distributed scalable video coding solution significantly outperforms the relevant coding benchmarks, nota-bly with around 36,8% bitrate saving in average when compared to the HEVC simulcasting benchmark.Van Xiem Hoangxiemhoang@vnu.edu.vnThi Hue Le Daohueledao94@gmail.comTrieu Duong Dinhduongdt@vnu.edu.vn2017-10-29T03:19:53Z2017-10-29T03:19:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2585This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25852017-10-29T03:19:53ZManagement of solar energy in microgrids using IoT-based dependable controlSolar energy generation requires efficient monitoring and management in moving towards technologies for net-zero energy buildings. This paper presents a dependable control system based on the Internet of Things (IoT) to control and manage the energy flow of renewable energy collected by solar panels within a microgrid. Data for optimal control include not only measurements from local sensors but also meteorological information retrieved in real-time from online sources. For system fault tolerance across the whole distributed control system featuring multiple controllers, dependable controllers are developed to control and optimise the tracking performance of photovoltaic arrays to maximally capture solar radiation and maintain system resilience and reliability in real time despite failures of one or more redundant controllers due to a problem with communication, hardware or cybersecurity. Experimental results have been obtained to evaluate the validity of the proposed approach.Manh Duong Phungduongpm@vnu.edu.vnMichel VillefromoyQuang Haquang.ha@uts.edu.au2017-10-29T03:16:53Z2017-12-17T08:24:10Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2587This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25872017-10-29T03:16:53ZJoint Exploration Model based Light Field Image Coding: A Comparative StudyThe recent light field imaging technology has been attracting a lot of interests due to its potential applications in a large number of areas including Virtual Reality, Augmented Reality (VR/AR), Teleconferencing, and E-learning. Light Field (LF) data is able to provide rich visual information such as scene rendering with changes in depth of field, viewpoint, and focal length. However, Light Field data usually associates to a critical problem - the massive data. Therefore, compressing LF data is one of the main challenges in LF research. In this context, we present in this paper a comparative study for compressing LF data with not only the widely used image/video coding standards, such as JPEG-2000, H.264/AVC, HEVC and Google/VP9 but also with the most recent image/video coding solution, the Joint Exploration Model. In addition, this paper also proposes a LF image coding flow, which can be used as a benchmark for future LF compression evaluation. Finally, the compression efficiency of these coding solutions is thoroughly compared throughout a rich set of test conditions.Cong Huy Phihuypc@ptit.edu.vnStuart PerryStuart.Perry@uts.edu.auAnh Vu Trinhvuta@vnu.edu.vnVan Xiem Hoangxiemhoang@vnu.edu.vn2017-10-29T03:16:22Z2017-10-29T03:16:22Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2586This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25862017-10-29T03:16:22ZA statistical search range adaptation solution for effective frame rate up - conversionThe recent development of advanced television systems has demonstrated a need for an efficient video conversion technique. In this scenario, frame rate up conversion (FRUC) solutions play an important role due to their benefits in both increasing the viewing quality experience and reducing the cost of video transmission. However, with the recent increase in video resolution, notably from Standard Definition (SD) to High Definition (HD) and ultra HD, FRUC now requires not only better interpolated frame quality but also lower FRUC time processing. Considering this problem, this paper proposes a novel statistical learning based adaptive search range solution to enable an effective FRUC mechanism. In the proposed adaptive search range solution, a set of spatial-temporal features are carefully defined and exploited to adaptively assign an appropriate search range value to each considered block, notably by formulating the search range adaptation as a classification problem and using the well-known support vector machine framework for the classification task. Experimental results conducted for a rich set of common video test sequences shows the advantages of the proposed adaptive search range solution, notably in both interpolated frame quality improvement and time processing reduction.Van Xiem Hoangxiemhoang@vnu.edu.vn2017-10-29T03:11:24Z2017-12-18T08:32:20Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2570This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25702017-10-29T03:11:24ZAn Online SVM based Side Information Creation for Efficient Distributed Scalable Video CodingWith the significant increase of the network heterogeneity and the wide use of emerging video applications such as wireless sensor networks, video surveillance systems or remote sensing, the Distributed Scalable Video Coding (DSVC) is a potential solution for efficiently transmitting and storing video data due to its high compression efficiency and low encoding complexity capabilities. In DSVC framework, Side Information (SI), created at the decoder side by exploiting the temporal and inter-layer correlations between decoded frames, plays an important role as it directly affects to the final DSVC coding performance. Therefore, this paper proposes a novel SI creation solution which explicitly formulates the SI creation as a classification problem and employs an online learning Support Vector Machine (SVM) engine to fuse several SI candidates. Experiments conducted for a rich set of test sequences show that the proposed SI creation solution significantly outperforms the previous DSVC SI creation methods in terms of SI quality while slightly introducing the computational complexity.Van Xiem Hoangxiemhoang@vnu.edu.vnNguyen Thi Huong Thaothaotb07@gmail.com2017-10-17T14:22:25Z2018-01-10T07:58:54Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2576This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25762017-10-17T14:22:25ZDesign and Simulation of Micromachined Gyroscope based on Finite Element MethodThis paper presents a design, simulation and analysis of a vibratory micromachining gyroscope. The gyroscope structure is based on the driving and sensing proof-mass configuration. The gyroscope dimensions are 1644 µm wide, 1754 µm long, 30µm thickness. The suspended spring consists of two silicon cantilevers of driving-mode and sensing-mode stiffness are 400 N/m and 165 N/m, respectively. Mass of driving proof-mass (including of 0.9408Ã�10E-11 kg sensing proof-mass) is 0.5452Ã�10E-7 kg. The simulated resonance frequency is 13324 Hz. The output signals are calculated based on the simulated vibration results. The structure is investigated with several input angular signals. The sensitivity of proposed structure is 100 mV/rad/s when Ï� changes from 0 to 1.6 rad/s.Van Thang Nguyennguyenbathangvov@gmail.comDuc Tan Trantantd@vnu.edu.vnDuc Trinh Chutrinhcd@vnu.edu.vn2017-10-16T08:15:44Z2017-10-16T08:15:44Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2575This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25752017-10-16T08:15:44ZDeveloping a Symmetrical Phased Array Antenna with Low ComplexityPhased array antennas were widely presented by their benefits, especially their capability of electronic beam scanning. Controlling some phase shifters of a phased array antenna without moving the array physically causes the wave-fronts of the antenna element changing, so the main beam of the array be able to scan in space. However, in both series and parallel feeding styles (conventional approach) it is required a number of phase shifters. This paper designs a symmetrical phased array antenna using only one phase shifter at each branch of the array. The analytical and simulation results using ADS (Advanced design system) software demonstrated the advantages of the proposed design.Cao Quyen Tranquyentc@vnu.edu.vn2017-10-06T02:58:15Z2018-01-10T07:56:52Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2571This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25712017-10-06T02:58:15ZA Novel Step Counter Supporting For Indoor Positioning Based On Inertial Measurement UnitStep counter provides important information on
various kinds of applications such as itinerary, exercise, health,etc. Especially, step counter is a very essential part for indoor positioning system in detecting exactly number of steps and supporting to find out the most suitable indoor position of people we want to track. In this paper, we proposed to develop a step counter system with high accuracy in comparison with the
commercial applications. The proposed system is using the
inertial measurement unit MPU9250 which consists of 3-DOF
gyroscope and 3-DOF accelerometer; these sensors were
calibrated carefully to avoid drift error. Furthermore, nRF24L01 wireless data transmitter/receiver is integrated for added convenience for users. After preprocessing, the recorded data are extracted from this IMU will be combined with step detection algorithm to find out the number of steps. The proposed algorithm was tested carefully with promising results of 96.5% in accuracy.Van Thanh Phamphamvanthanh1209@gmail.comThi Anh Dao Nguyendaonta81@gmail.comThi Thuy Quynh Tranquynhttt@vnu.edu.vnThi Phuong Dung Chudungctp@vnu.edu.vnDuc Tan Trantantd@vnu.edu.vn2017-08-31T10:17:16Z2017-08-31T10:17:16Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2567This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25672017-08-31T10:17:16ZPerformance Analysis of Frequency Reuse for PPP Networks in Composite Rayleigh-Lognormal Fading ChannelSinh Cong Lamcongls@vnu.edu.vnKumbesan SandrasegaranPantha Ghosal2017-08-03T02:21:47Z2017-08-03T02:21:47Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2564This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25642017-08-03T02:21:47ZAutomatic Crack Detection in Built Infrastructure Using Unmanned Aerial VehiclesThis paper addresses the problem of automatic inspection by means of Unmanned Aerial Vehicles (UAV) for health monitoring of infrastructure. Our approach comprises two stages, data collection using unmanned aerial vehicles and image processing with histogram analysis. For the data collection, a 3D model of the monitored structure is first created by using vision-based sensors attached on the UAV. Based on the model developed, geometrical properties are extracted to generate way points necessary for navigating the UAV for image capturing of the structure of different materials, for example, concrete. From the images obtained, our next step is to stick them together using the overlapped field of view. We then create histograms of the stuck images and detect peaks based on cosine similarity. We finally identify a potential crack or surface defect as location of the histogram peaks. The whole process is automatically carried out so that the inspection time is significantly improved while minimising any safety hazards that may be encountered in the UAV inspection process. A prototypical system has been developed with obtained results being evaluated and verified to show its validity.Manh Duong Phungduongpm@vnu.edu.vnVan Truong HoangTran Hiep Dinhtranhiep.dinh@vnu.edu.vnQuang Haquang.ha@uts.edu.au2017-08-03T02:21:40Z2017-08-03T02:21:40Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2563This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25632017-08-03T02:21:40ZAdaptive Second-order Sliding Mode Control of UAVs for Civil ApplicationsQuadcopters, as unmanned aerial vehicles (UAVs), have great potential in civil applications such as surveying, building monitoring, and infrastructure condition assessment. Quadcopters however are relatively sensitive to rotational noises so that their performance may be quickly downgraded in the case of inadequate control, system uncertainties and/or disturbances. In this study, we deal with the quadrotor control problem by proposing a new control scheme named the adaptive second-order quasi-continuous sliding mode control (adaptive 2-QCSM). The goal is to achieve robust attitude control for the task of monitoring and inspection of built infrastructure. We first formulate the mathematical model of the quadcopter, incorporating nonlinearity, strong coupling, uncertain dynamics and external disturbances. We then use a Lyapunov function to derive the adaptive 2-QCSM control laws. We further tune it to ensure finite-time reaching under these control laws. Extensive simulations have been carried out for evaluation. Results show that the proposed control scheme can attenuate chattering to obtain stable operations under large parameter variations and strong disturbance conditions.Van Truong HoangAnsu Man SinghManh Duong Phungduongpm@vnu.edu.vnQuang Ha2017-07-31T03:09:51Z2017-12-07T06:49:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2562This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25622017-07-31T03:09:51ZA Comprehensive Reliability Assessment of Fault-Resilient Network-on-Chip Using Analytical ModelNam Khanh Dangdnk0904@gmail.comAkram Ben AhmedXuan Tu Trantutx@vnu.edu.vnYuichi OkuyamaAbderazek Ben Abdallahbenab@u-aizu.ac.jp2017-07-24T04:00:09Z2017-07-24T04:00:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2561This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25612017-07-24T04:00:09ZAnnual Scientific Report 2017 (ASR 2017)The VNU-UET Annual Scientific Report has been started from 2016.Xuan Tu Trantutx@vnu.edu.vnXuan Hieu Phanhieupx@vnu.edu.vnDuc Tan Trantantd@vnu.edu.vnManh Thang Phamthangpm@vnu.edu.vnDuc Thang Phampdthang@vnu.edu.vnBao Son Phamsonpb@vnu.edu.vn2017-07-06T10:55:08Z2018-01-10T07:55:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2552This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25522017-07-06T10:55:08ZDevelopment of a Real Time Supported Program for Motorbike Drivers Using Smartphone Built-in SensorsUsing mobile phones during traffic progress is one of the main causes traffic accidents because drivers do not focus on driving, they try to listen phone calls or to text some messages... Most of research work has focused to car driving. However, using motorbike is very popular in some developing countries such as Vietnam, India, etc. Up to now, there are just a few works, which focus to motorbike driving with obvious limitations. Thus, in this research, we proposed a complete solution for bikers who own a smartphone. Our work exploits the information from built-in sensors in Android smartphone. A complete scheme for motorbike driving is proposed. In this scheme, the user state is detected by improving the current Google activity recognition API. If the state is “On vehicle”, the phone automatically switches to silent mode and send to the caller an SMS. Our work provides a mechanism to receive the calls from VIP contacts and urgent calls. The phone would switch back to the normal mode if the state is not "On vehicle". Furthermore, it sends the accident location to the relatives when an accident occurs to save their lives automatically. The application was tested carefully and it can be used to protect the lives of motorbike drivers.Van Thanh Phamphamvanthanh1209@gmail.comTien Anh Nguyenanhnt007@gmail.comDuc Nghia Trannghiatranduc1986@yahoo.comDuc Anh Nguyenndanh@gmail.comDuc Tan Trantantd@vnu.edu.vn2017-06-14T09:49:48Z2017-06-14T09:49:48Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2391This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/23912017-06-14T09:49:48ZBehavior-based Navigation of Mobile Robot in Unknown Environments Using Fuzzy Logic and Multi-Objective OptimizationThis study proposes behavior-based navigation architecture, named BBFM, to deal with the problem of navigating the mobile robot in unknown environments in the presence of obstacles and local minimum regions. In the architecture, the complex navigation task is split into principal sub-tasks or behaviors. Each behavior is implemented by a fuzzy controller and executed independently to deal with a specific problem of navigation. The fuzzy controller is modified to contain only the fuzzification and inference procedures so that its output is a membership function representing the behavior’s objective. The membership functions of all controllers are then used as the objective functions for a multi-objective optimization process to coordinate all behaviors. The result of this process is an overall control signal, which is Pareto-optimal, used to control the robot. A number of simulations, comparisons, and experiments were conducted. The results show that the proposed architecture outperforms some popular behaviorbased architectures in term of accuracy, smoothness, traveled distance, and time response.Thi Thanh Van Nguyenvanntt@vnu.edu.vnManh Duong Phungduongpm@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2017-06-14T09:49:05Z2017-06-14T09:49:05Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2512This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25122017-06-14T09:49:05ZEnhanced discrete particle swarm optimization path planning for UAV vision-based surface inspectionIn built infrastructure monitoring, an efficient path planning algorithm is essential for robotic inspection of large surfaces using computer vision. In this work, we first formulate the inspection path planning problem as an extended travelling salesman problem (TSP) in which both the coverage and obstacle avoidance were taken into account. An enhanced discrete particle swarm optimization (DPSO) algorithm is then proposed to solve the TSP, with performance improvement by using deterministic initialization, random mutation, and edge exchange. Finally, we take advantage of parallel computing to implement the DPSO in a GPU-based framework so that the computation time can be significantly reduced while keeping the hardware requirement unchanged. To show the effectiveness of the proposed algorithm, experimental results are included for datasets obtained from UAV inspection of an office building and a bridge.Manh Duong Phungduongpm@vnu.edu.vnCong Hoang QuachTran Hiep Dinhtranhiep.dinh@vnu.edu.vnHa Quangquang.ha@uts.edu.au2017-06-14T05:51:38Z2018-01-12T03:43:41Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2500This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25002017-06-14T05:51:38ZHigh-Efficiency High-Gain 2.4 GHz Class-B Power
Amplifiers in 0.13 µm CMOS for Wireless CommunicationsThis paper presents high-efficiency high-gain 2.4 GHz power amplifiers (PAs) for wireless communications. Two class-B PAs are designed and verified in 0.13 µm CMOS mixed-signal/RF process provided by TSMC. The PAs employs cascode topologies with wideband multi-stage matchings. The single-stage cascode PA is designed for a high power added efficiency (PAE) of 35.4% while the gain is 20.4 dB over the -3 dB bandwidth between 2.4 GHz and 2.48 GHz. The two-stage cascode PA is targeted for a high gain
of 37.7 dB while it exhibits a peak PAE of 24.1%. Supplied by 1.2 V supply voltages, the PAs consume DC powers of 4.5 mW and 9 mW, respectivelyTuan Anh Vutanhvu@vnu.edu.vnDinh Tuan Phamtuanpd@vnu.edu.vnGia Duong Bachduongbg@vnu.edu.vn2017-06-10T11:54:35Z2017-12-07T06:51:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2490This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24902017-06-10T11:54:35ZAES datapath optimization strategies for low-power low-energy multi-security-level Internet-of-Thing applicationsConnected devices are getting attention because of the lack of security mechanisms in current Internet-of-Thing (IoT) products. The security can be enhanced by using standardized and proven-secure block ciphers as Advanced Encryption Standard (AES) for data encryption and authentication. However, these security functions take a large amount of processing power and power/energy consumption. In this paper, we present our hardware optimization strategies for Advanced Encryption Standard (AES) for high speed, ultra-low power, ultra-low energy IoT applications with multiple levels of security. Our design supports multiple security levels through different key sizes, power and energy optimization for both datapath and
key expansion. The estimated power results show that our
implementation may achieve an energy per bit comparable with
the lightweight standardized algorithm PRESENT of less than
1pJ/bit at 10MHz at 0.6V with throughput of 28Mbps in ST
FDSOI 28nm technology. In terms of security evaluation, our
proposed datapath, 32-bit key out of 128 bits cannot be revealed by Correlation Power Analysis (CPA) attack using less than 20 thousand traces.Duy Hieu Buihieubd@vnu.edu.vnDiego Puschinidiego.puschini@cea.frSimone Bacles-MinSimone.BACLES-MIN@cea.frEdith Beigneedith.beigne@cea.frXuan Tu Trantutx@vnu.edu.vn2017-06-09T11:37:33Z2017-06-09T11:37:33Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2485This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24852017-06-09T11:37:33ZSecond-order optimization based adaptive PARAFAC decomposition of three-way tensorsA fast adaptive parallel factor (PARAFAC) decomposition algorithm is proposed for a class of third-order tensors that have one dimension growing linearly with time. It is based on an alternating least squares approach in conjunction with a Newton-type optimization technique. By preserving the Khatri-Rao product and exploiting the the reduced-rank update structure of the estimated subspace at each time instant, the algorithm achieves linear complexity and superior convergence performance. A modified version of the algorithm is also proposed to deal with the non-negative constraint. In addition, parallel implementation issues are investigated. Finally, the performance of the algorithm is numerically studied and compared to several state-of-the-art algorithms.Viet Dung Nguyennvdung@vnu.edu.vnKarim Abed-Meraimkarim.abed-meraim@univ-orleans.frLinh Trung Nguyenlinhtrung@vnu.edu.vn2017-06-09T11:34:48Z2017-06-09T11:34:48Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2484This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24842017-06-09T11:34:48ZGeneralized minimum noise subspace for array processingBased on the minimum noise subspace (MNS) method previously introduced in the context of blind channel identification, generalized minimum noise subspace (GMNS) is proposed in this paper for array processing that generalizes MNS with respect to the availability of only a fixed number of parallel computing units. Different batch and adaptive algorithms are then introduced for fast and parallel computation of signal (principal) and noise (minor) subspaces. The computational complexity of GMNS and its related estimation accuracy are investigated by simulated experiments and a real-life experiment in radio astronomy. It is shown that GMNS represents an excellent tradeoff between the computational gain and the subspace estimation accuracy, as compared to several standard subspace methods.Viet Dung Nguyennvdung@vnu.edu.vnKarim Abed-Meraimkarim.abed-meraim@univ-orleans.frLinh Trung Nguyenlinhtrung@vnu.edu.vnRodolphe Weberweberrod@gmail.com2017-06-09T11:27:50Z2017-06-09T11:27:50Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2489This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24892017-06-09T11:27:50ZSpectral-Efficient Model for Multiuser Massive MIMO: Exploiting User VelocityThe employment of a massive number of antennas
in multiple-input multiple-output systems, known as massive MIMO, has drawn a new horizon for future communications systems to support a very large number of users. However, the actual number of active users in massive MIMO are limited by pilots training via the coherence time of the communication channel which is inversely proportional to the user velocity. The
current model applies this coherence time for every user to design multiuser massive MIMO, which might result in a suboptimal solution since the users usually move at different speeds in practice. In this paper, we investigate multiuser massive MIMO by taking into consideration the differences in user velocities.
In particular, two multiuser models are proposed to maximize the per-user spectral efficiency and the number of served users, respectively. System capacity of the proposed models is provided in analytical expression. Finally, numerical results demonstrate the advantages of our proposed models compared with the reference model.Xuan Thang Vuthangvx85@gmail.comAnh Vu Trinhvuta@vnu.edu.vnSymeon ChatzinotasChatzinotas@gmail.comBjörn OtterstenOttersten@gmail.com2017-06-09T11:26:45Z2018-01-10T08:00:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2479This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24792017-06-09T11:26:45ZDeterministic compressive sampling for high-quality image reconstruction of ultrasound tomographyBackground
A well-known diagnostic imaging modality, termed ultrasound tomography, was quickly developed for the detection of very small tumors whose sizes are smaller than the wavelength of the incident pressure wave without ionizing radiation, compared to the current gold-standard X-ray mammography. Based on inverse scattering technique, ultrasound tomography uses some material properties such as sound contrast or attenuation to detect small targets. The Distorted Born Iterative Method (DBIM) based on first-order Born approximation is an efficient diffraction tomography approach. One of the challenges for a high quality reconstruction is to obtain many measurements from the number of transmitters and receivers. Given the fact that biomedical images are often sparse, the compressed sensing (CS) technique could be therefore effectively applied to ultrasound tomography by reducing the number of transmitters and receivers, while maintaining a high quality of image reconstruction.
Methods
There are currently several work on CS that dispose randomly distributed locations for the measurement system. However, this random configuration is relatively difficult to implement in practice. Instead of it, we should adopt a methodology that helps determine the locations of measurement devices in a deterministic way. For this, we develop the novel DCS-DBIM algorithm that is highly applicable in practice. Inspired of the exploitation of the deterministic compressed sensing technique (DCS) introduced by the authors few years ago with the image reconstruction process implemented using l 1 regularization.
Results
Simulation results of the proposed approach have demonstrated its high performance, with the normalized error approximately 90% reduced, compared to the conventional approach, this new approach can save half of number of measurements and only uses two iterations. Universal image quality index is also evaluated in order to prove the efficiency of the proposed approach.
Conclusions
Numerical simulation results indicate that CS and DCS techniques offer equivalent image reconstruction quality with simpler practical implementation. It would be a very promising approach in practical applications of modern biomedical imaging technology.Huy Tran Quangtranquanghuysp2@gmail.comTue Huynh Huuhhtue@hcmiu.edu.vnLong Ton Thatttlong@hcmiu.edu.vnDuc Tan Trantantd@vnu.edu.vn2017-06-03T10:07:05Z2017-08-08T14:50:22Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2468This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24682017-06-03T10:07:05ZAXI-NoC: High-Performance Adaptation Unit for ARM Processors in Network-on-Chip ArchitecturesThe increasing demand on scalability and reusability of system-on-chip design as well as the decoupling between computation and communication has motivated the growth of the Network-on-Chip (NoC) paradigm in the last decade. In NoC-based systems, the computational resources (i.e. IPs) communicate with each other using a network infrastructure. Many works have focused on the development of NoC architectures and routing mechanisms, while the interfacing between network and associated IPs also needs to be considered. In this paper, we present a novel efficient AXI (AMBA eXtensible Interface) compliant network adapter for NoC architectures, which is named an AXI-NoC adapter. The proposed network adapter achieves high communication throughput of 20.8Gbits/s and consumes 4.14mW at the operating frequency of 650MHz. It has a low area footprint (952 gates, approximate to 2,793um2 with CMOS 45nm technology) thanks to its effective hybrid micro-architectures and with zero latency thanks to the proposed mux-selection method.Xuan Tu Trantutx@vnu.edu.vnTung NguyenHai Phong Phanhaiphongphan@gmail.comDuy Hieu Buihieubd@vnu.edu.vn2017-04-12T01:56:14Z2017-04-12T01:56:14Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2457This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/24572017-04-12T01:56:14ZPower Consumption Estimation using VNOC2.0 Simulator for a Fuzzy-Logic based Low Power Network-on-ChipDynamic Voltage and Frequency Scaling (DVFS) has been known as an efficient technique to reduce the power consumption of a Network-on-Chip (NoC). An important question in DVFS is how to change the voltage and frequency adaptable to the required performance of the system at run-time while reducing the power consumption as much as possible. Another
problem is how a tool could quickly and efficiently validate
or reject a NoC architecture employing DVFS. By integrating
the Orion 2 power model, VNOC 2.0 simulator can be used as
either a NoC simulation tool or a platform for implementing and investigating DVFS ideas. In this paper, we focus on developing a new solution for NoC architectures to save energy using fuzzy-logic algorithms. A controller is designed to predict the change of traffic load based on the fuzzy logic algorithm, then adjusts the voltage and frequency correspondingly to minimize the power consumption while keeping the performance of the whole system. An estimation of power consumption has been done by using
VNOC 2.0 simulator. The simulation results show that our model can save up to 46% the power consumption of a 8x8 NoC.Hai Phong Phanhaiphongphan@gmail.comXuan Tu Trantutx@vnu.edu.vnTomohiro Yonedayoneda@nii.ac.jp2016-12-25T16:59:07Z2017-12-21T23:05:20Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2247This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/22472016-12-25T16:59:07ZSwarm Intelligence-Based Approach for Macroscopic Scale Odor Source Localization Using Multi-robot SystemOdor source localization is a problem of great importance. Two mainstream methods among numerous proposed ones are probabilistic algorithms and bio-inspired algorithms. Compared to probabilistic algorithms, biomimetic approaches are much less intensive in term of computational cost. Thus, despite their slightly worse performance, biomimetic approaches have received much more attention. In this paper, a novel method based on a bio-inspired algorithm - Particle Swarm Optimization (PSO) - is proposed for a multi-robot system (MRS). The proposed algorithm makes use of wind information and immediate odor gradient to enhance the performance of the MRS. A mechanism based on Artificial Potential Field (APF) is utilized to ensure non-collision movement of the robots. This method is tested by simulation on Matlab. Data for the test scenarios, all in large scales, are generated using Fluent. Nearly 2000 runs are carried out and the simulation results confirm the proposed algorithm’s effectiveness.Anh Quy Hoangquyha@vnu.edu.vnMinh Trien Phamtrienpm@vnu.edu.vn