VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2020-09-24T11:58:02ZEPrintshttps://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/21532012020-09-23T04:41:10Z2020-09-23T04:41:10Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4065This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40652020-09-23T04:41:10ZSmartphone Indoor Positioning Based on Enhanced BLE Beacon Multi-laterationIn this paper, we introduce a smartphone indoor positioning method using Bluetooth Low Energy (BLE) beacon multilateration. At first, based on signal strength analysis, we construct a distance calculation model for BLE beacons. Then, with the aims to improve positioning accuracy, we propose an improved Lateral method (Range-based method) which is applied for 4 nearby beacons. The method is intended to design a real-time system for some services such as emergency assistance, personal localization and tracking, location-based advertising and marketing, etc. Experimental results show that the proposed method achieves high accuracy when compared with the state of the art lateral methods such as geometry-based (conventional trilateration), Least Square Estimation-based (LSE-based) and weighted LSE-based.Ngoc Son Duongduongson.vnu@gmail.comThi Thai Mai Dinhdttmai@vnu.edu.vn2020-09-14T02:55:49Z2020-09-14T02:55:49Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4061This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40612020-09-14T02:55:49ZA new constraint programming model and a linear programming-based adaptive large neighborhood search for the vehicle routing problem with synchronization constraintsWe consider a vehicle routing problem which seeks to minimize cost subject to time window and synchronization constraints. In this problem, the fleet of vehicles is categorized into regular and special vehicles. Some customers require both vehicles’ services, whose service start times at the customer are synchronized. Despite its important real-world application, this problem has rarely been studied in the literature. To solve the problem, we propose a Constraint Programming (CP) model and an Adaptive Large Neighborhood Search (ALNS) in which the design of insertion operators is based on solving linear programming (LP) models to check the insertion feasibility. A number of acceleration techniques is also proposed to significantly reduce the computational time. The computational experiments show that our new CP model finds better solutions than an existing CP-based ALNS, when used on small instances with 25 customers and with a much shorter running time. Our LP-based ALNS dominates the CP-based ALNS, in terms of solution quality, when it provides solutions with better objective values, on average, for all instance classes. This demonstrates the advantage of using linear programming instead of constraint programming when dealing with a variant of vehicle routing problems with relatively tight constraints, which is often considered to be more favorable for CP-based methods. We also adapt our algorithm to solve a well-studied variant of the problem, and the obtained results show that the algorithm provides good solutions as state-of-the-art approaches and improves four best known solutions.Minh Hoang Haminhhoang.ha@vnu.edu.vnTat Dat NguyenDuy Thinh NguyenHoang Giang PhamThuy DoLouis-Martin Rousseau2020-09-14T02:55:14Z2020-09-14T02:55:14Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4064This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40642020-09-14T02:55:14ZImprovements on the performance of SCM/WDM-based RoF systemRadio over Fiber (RoF) techniques are good candidates to create the backbone of the next generation of wireless networks. Many parameters affect RoF communications such as amplified spontaneous emission noise (ASE), four-wave mixing nonlinearity (FWM), the modulation, channel spacing, switching voltage, and phase shifter. In this paper, we propose an improved model of RoF communication systems using subcarrier multiplexing/wavelength division multiplexing (SCM/WDM) technique with unequal channel spacing and 1-km Erbium-doped fiber amplifier (EDFA). Simulation results confirmed that we could obtain the lowest bit error rate and noises when the EDFA is placed at 1 km from the transmitter by using optical single-sideband (OSSB) modulation at frequencies 193.1, 193.2, 193.35, and 193.6 THz.Duc Tan Trantantd@vnu.edu.vnTrung Ninh Buininhbt@vnu.edu.vn2020-09-14T02:52:10Z2020-09-14T02:52:41Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4060This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40602020-09-14T02:52:10ZSolving the k-dominating set problem on very large-scale networksThe well-known minimum dominating set problem (MDSP) aims to construct the minimum-size subset of vertices in a graph such that every other vertex has at least one neighbor in the subset. In this article, we study a general version of the problem that extends the neighborhood relationship: two vertices are called neighbors of each other if there exists a path through no more than k edges between them. The problem called “minimum k-dominating set problem” (MkDSP) becomes the classical dominating set problem if k is 1 and has important applications in monitoring large-scale social networks. We propose an efficient heuristic algorithm that can handle real-world instances with up to 17 million vertices and 33 million edges. This is the first time such large graphs are solved for the minimum k-dominating set problemMinh Hai NguyenMinh Hoang Haminhhoang.ha@vnu.edu.vnDiep Nguyen NDiep.Nguyen@uts.edu.auThe Trung Trantrung@fpt.edu.vn2020-09-14T02:51:25Z2020-09-14T02:51:25Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4056This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40562020-09-14T02:51:25ZOpposite Partial Response Filter for Shingled Magnetic Recording SystemsShingled magnetic recording (SMR) is regarded as the most influential technology for the next-generation magnetic recording systems. The SMR tracks are partly overlapped by each other, and the SMR systems can obtain higher area densities by increasing track per inch density. As a result, this brings more interference from the adjacent sidetracks, i.e., intertrack interference (ITI) while reading the home track. In this letter, we are interested in applying the filtering process to the squeezed tracks before recording to improve the quality of retrieved data. The preprocessing is to reduce the effect of unwanted signals from the sidetracks on the home track. The results show that the SMR system's performance is vastly improved even under the extremely severe effects of the ITI.Dinh Chi NguyenThu Phuong NguyenSinh Cong Lamcongls@vnu.edu.vn2020-09-08T09:59:25Z2020-09-08T09:59:25Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4057This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40572020-09-08T09:59:25ZA General Model of Fractional Frequency Reuse: Modelling and Performance AnalysisFractional Frequency Reuse (FFR) is a promising to improve the spectrum e ciency in the LongTerm Evolution (LTE) cellular network. In the literature, various research works have been conducted to evaluate the performance of FFR. However, the presented analytical approach only dealt with the special cases in which the users are divided into 2 groups and only two power levels are utilised. In this paper, we consider a general case of FFR in which the users are classified intogroups and each group is assigned a serving power level. The mathematical model of the general FFR is presented and analysed through a stochastic geometry approach. The derived analytical results in terms of average coverage probability can covered all the related well-known results in the literature.Sinh Cong Lamcongls@vnu.edu.vnQuoc Tuan Nguyentuannq@vnu.edu.vnKumbesan Sandrasegarankumbesan.sandrasegaran@uts.edu.au2020-09-08T09:58:26Z2020-09-08T09:58:26Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4058This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40582020-09-08T09:58:26ZEnergy Harvesting Technique Utilizing Resource Allocation Algorithm in 5G Wireless ChannelThe technology utilized in Energy harvesting from wireless channels of cellular communication is one of the critical aspects of future generation of cellular telecommunication, as it will be one of its alternatives for conserving power, by transmitting power to devices through the cellular networks. There have been numerous techniques that were proposed in 5G cellular technology for sustainability and enhancing the lifespan of centralized power sources in mobile and future IoT devices. Throughout this research paper, a literature review of the main current advancements of EH technology and SWIPT techniques will be presented as well as its achievements. An implementation of one of the Energy Harvesting techniques which is the SWIPT, in a cooperative relay scenario is presented in this paper and it is applied with a proper simulation tool. The simulation will mainly be implemented in MATLAB, which is divided into several functions computing the essential primary values for the proposed EH network. Firstly, the relay scenario that comprises a base station and two receivers with one receiver acting as a relay station while the other act as the final receiver for both transmissions. Secondly, the SWIPT technique is implemented in the Relay stations, where the AF protocol is utilized. Finally, the last receiver will receive both signals which represent the information decoding and the EH signals from the relay stations. The evaluation of the simulation results will be discussed in the final stages of the research. The outcome of this research will be the simulation results in which the estimation of the EH efficiency is evaluated based on two factors including; the number of EH subcarriers in the final receiver, and the average allocated power for EH transmission received by the final receiver. The idea behind this research paper was to search for an efficient method to harvest energy from the next nominated waveform of the 5th generation mobile communication OFDM. The anticipated outcome of this paper is beneficial in minimizing the cellular operation cost, extending the user equipment (UE) battery life, and creating an overall conserving green communication.H. AldhanhaniandSandrasegaran KumbesanKumbesan.Sandrasegaran@uts.edu.auSinh Cong Lamcongls@vnu.edu.vn2020-09-08T09:55:19Z2020-09-08T09:55:19Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4059This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40592020-09-08T09:55:19ZHow to Forecast the Students' Learning Outcomes Based on Factors of Interactive Activities in a Blended Learning CourseThis paper summarizes the research results of identifying the influencing factors in the online learning phase of a blended learning course. From such factors, we propose a model for predicting student outcomes. In our study, we have conducted several models in order to predict the student's learning outcomes, using a course of 231 participants. Obtained data from the logs file of an LMS system is analyzed using learning analytics and machine learning techniques, and the results propose that the four factors are the number of views, the number of posts, the number of forum views, and the number of on-time submitted assignments impact on the student's learning outcomes. For the forecast of the final exam grade based on the results of the formative assessment tests, Bayesian Ridge is the most accurate among the four conducted models (Linear Regression, KNR, SVM, Bayesian Ridge). Our study can be a useful material for lecturers and course designers in effectively organizing blended learning courses.Minh Duc Leduclm@vnu.edu.vnHoa Huy NguyenDuc Loc NguyenViet Anh Nguyenvietanh@vnu.edu.vn2020-09-07T10:02:36Z2020-09-07T10:02:36Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4052This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40522020-09-07T10:02:36ZA framework for assume-guarantee regression verification of evolving softwareThis paper presents a framework for verifying evolving component-based software using assume-guarantee logic. The goal is to improve CDNF-based assumption generation method by having local weakest assumptions that can be used more effectively when verifying component-based software in the context of software evolution. For this purpose, we improve the technique for responding to membership queries when generating candidate assumptions. This technique is then integrated into a proposed backtracking algorithm to generate local weakest assumptions. These assumptions are effectively used in rechecking the evolving software by reducing time required for assumption regeneration within the proposed framework. The proposed framework can be applied to verify software that is continually evolving. An implemented tool and experimental results are presented to demonstrate the effectiveness and usefulness of the framework.Hoang-Viet TranPham Ngoc HungViet-Ha NguyenToshiaki Aoki2020-09-07T08:18:12Z2020-09-07T08:18:12Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4048This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40482020-09-07T08:18:12ZA thermal distribution, lifetime reliability prediction and spare TSV insertion platform for stacking 3D NoCsNam Khanh Dangdnk0904@gmail.comAkram Ben AhmedFakhrul Zaman RokhaniAbderazek Ben Abdallahbenab@u-aizu.ac.jpXuan Tu Trantutx@vnu.edu.vn2020-09-07T08:16:54Z2020-09-07T08:16:54Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4049This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40492020-09-07T08:16:54ZA thermal-aware on-line fault tolerance method for TSV lifetime reliability in 3D-NoC systemsThrough-Silicon-Via (TSV) based 3D Integrated Circuits (3D-IC) are one of the most advanced architectures by providing low power consumption, shorter wire length and smaller footprint. However, 3D-ICs confront lifetime reliability due to high operating temperature and interconnect reliability, especially the Through-Silicon-Via (TSV), which can significantly affect the accuracy of the applications. In this paper, we present an online method that supports the detection and correction of lifetime TSV failures, named IaSiG. By reusing the conventional recovery method and analyzing the output syndromes, IaSiG can determine and correct the defective TSVs. Results show that within a group, $R$ redundant TSVs can fully localize and correct $R$ defects and support the detection of $R+1$ defects. Moreover, by using $G$ groups, it can localize up to GxR and detect up to Gx(R+1) defects. An implementation of IaSiG for 32-bit data in eight groups and two redundancies has a worst-case execution time (WCET) of 5,152 cycles while supporting at most 16 defective TSVs (50\% localization).
By integrating IaSiG onto a 3D Network-on-Chip, we also perform a grid-search based empirical method to insert suitable numbers of redundancies into TSV groups. The empirical method takes the operating temperature as the factor of accelerated fault due to the fact that temperature is one of the major issues of 3D-ICs. The results show that the proposed method can reduce the number of redundancies from the uniform method while still maintaining the required Mean Time to Failure.Nam Khanh Dangdnk0904@gmail.comAkram Ben AhmedAbderazek Ben Abdallahbenab@u-aizu.ac.jpXuan Tu Trantutx@vnu.edu.vn2020-08-20T04:31:15Z2020-08-20T04:31:15Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4046This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40462020-08-20T04:31:15ZBig Data Analytics and Machine Learning for Industry 4.0: An OverviewOur industry is now upgrading to the next industrial revolution, or Industry 4.0, which have been generating massive data that we have never seen before. It requires us to employ new methods to take advantage of this fast and big data. Optimizing and fully automated production, by harnessing cutting-edge technologies, are the ultimate goals of Industry 4.0. Among various advanced and cutting-edge technologies, machine learning (ML) and big data analytics (BDA) have been incorporated and applied successfully to obtain insights from the data and help to adjust automatically industrial processes as needed.Nguyen Tuan Thanh Lethanhlnt@tlu.edu.vnManh Linh Phamlinhmp@vnu.edu.vn2020-08-02T06:21:45Z2020-08-02T06:21:45Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4044This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40442020-08-02T06:21:45Z３ｄネットワークオンチップのためのｔｓｖ誤り耐容ルータ装置
TSV Error Tolerant Router Device for 3D Network On ChipA TSV error tolerant router device for 3D network-on-chip is disclosed. In a TSV error tolerant router device for a 3D network-on-chip having a plurality of routers arranged in each of a plurality of layers, and routers between the layers are connected by through-silicon vias, the through-silicon vias are provided. Each of which belongs to one corresponding router, has a plurality of clusters around the corresponding router, and is adjacent to the corresponding router when one of the plurality of clusters belonging to the corresponding router is defective A router is selected, and one cluster of the selected router is replaced in place of the defective cluster, maintaining connectivity between the layers. [Selection] Figure 2Abderazek Ben Abdallahbenab@u-aizu.ac.jpNam Khanh Dangdnk0904@gmail.comMasayuki Hisada2020-08-02T06:20:00Z2020-08-02T06:21:31Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4043This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40432020-08-02T06:20:00ZA Lifelong Sentiment Classification Framework Based on a Close Domain Lifelong Topic Modeling MethodIn lifelong machine learning, the determination of the hypotheses related to the current task is very meaningful thanks to the reduction of the space to look for the knowledge patterns supporting for solving the current task. However, there are few studies for this problem. In this paper, we propose the definitions for measuring the “close domains to the current domain”, and a lifelong sentiment classification method based on using the close domains for topic modeling the current domain. Experimental results on sentiment datasets of product reviews from Amazon.com show the promising performance of system and the effectiveness of our approach.Thi Cham Nguyennthicham@hpmu.edu.vnThi Ngan PhamMinh Chau NguyenTri Thanh Nguyenntthanh@vnu.edu.vnQuang Thuy Hathuyhq@vnu.edu.vn2020-08-02T06:19:51Z2020-08-02T06:19:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4042This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40422020-08-02T06:19:51ZExploiting CBOW and LSTM Models to Generate Trace Representation for Process MiningIn the field of process mining, one of the challenges of the trace representation problem is to exploit a lot of potentially useful information within the traces while keeping a low dimension of the corresponding vector space. Motivated by the initial results of applying the deep neural networks for producing trace representation, in this paper, we continue to study and apply two more advanced models of deep learning, i.e., Continuous Bag of Words and Long short-term memory, for generating the trace representation. The experimental results have achieved significant improvement, i.e., not only showing the close relationship between the activities in a trace but also helping to reduce the dimension of trace representation.Hong-Nhung BuiTrong-Sinh VuHien-Hanh NguyenTri-Thanh NguyenQuang-Thuy Ha2020-08-02T06:19:39Z2020-08-02T06:19:39Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4039This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40392020-08-02T06:19:39ZKinh tế số: Bối cảnh thế giới và liên hệ với Việt NamSự phát triển mạnh mẽ song hành giữa các công nghệ số hóa (điển hình là Internet vạn vật) và kinh tế số (điển hình là sự xuất hiện và phát triển của nhiều hình thức kinh doanh sáng tạo và đa dạng) đã tạo nên sự biến đổi to lớn và nhanh chóng đối với kinh tế, xã hội và mọi mặt của đời sống con người. Kinh tế số đã trở thành một thành phần kinh tế đóng góp một tỷ trọng đáng kể với xu thế ngày càng tăng trong toàn bộ nền kinh tế quốc dân. Đồng thời, kinh tế số cũng làm phát sinh không ít các thách thức đáng quan tâm về khái niệm kinh tế số, mô hình phát triển kinh tế số và đo lường kinh tế số. Việc tìm ra các mô hình (khái niệm, phát triển, đo lường) kinh tế số nhận được sự quan tâm đặc biệt của nhiều quốc gia và các tổ chức quốc tế, như: Tổ chức hợp tác và phát triển kinh tế thế giới, Ngân hàng thế giới,... Bài báo này cung cấp một số tìm hiểu bước đầu về kinh tế số, về một số cơ hội và thách thức từ kinh tế số, cũng như mô hình đo lường. Bài báo cũng đưa ra một vài trao đổi sơ bộ về kinh tế số tại Việt Nam, đó là: tăng cường nhận thức đúng đắn và toàn diện về kinh tế số, phát triển nguồn nhân lực chuyên nghiệp kinh tế số (đặc biệt là lực lượng chuyên gia cao cấp về kinh tế số) và hệ sinh thái kinh tế số tại Việt Nam sẽ góp phần đẩy nhanh phát triển kinh tế số của Việt Nam.Quang Thuy Hathuyhq@vnu.edu.vnXuan Hieu Phanhieupx@vnu.edu.vnTri Thanh Nguyenntthanh@vnu.edu.vnTrong Hieu Tranhieutt@vnu.edu.vnMai Vu Tranvutm@vnu.edu.vnHuu Duc Nguyenducnh@vnu.edu.vn2020-08-02T06:19:24Z2020-08-02T06:19:24Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4038This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40382020-08-02T06:19:24ZMôi trường và giải pháp cho chiến lược quốc gia về trí tuệ nhân tạo của Việt NamTrí tuệ nhân tạo (TTNT) đã tạo ra những chuyển đổi lớn về kinh tế, xã hội, đời sống của con người, và nhiều nước đã xây dựng chiến lược quốc gia về TTNT. Phân tích môi trường và xây dựng chiến lược quốc gia về TTNT là một công việc đầy thách thức đối với nhiều quốc gia, trong đó có Việt Nam. Bài báo tìm hiểu một số nghiên cứu phân tích về môi trường và xây dựng chiến lược quốc gia về TTNT. Từ đó đưa ra giải pháp định hướng cho chiến lược quốc gia về TTNT của Việt NamQuang Thuy Hathuyhq@vnu.edu.vnThanh Thuy Nguyennguyenthanhthuy@vnu.edu.vnBao Son Phamsonpb@vnu.edu.vnXuan Hieu Phanhieupx@vnu.edu.vnTrong Hieu Tranhieutt@vnu.edu.vnMai Vu Tranvutm@vnu.edu.vnQuoc Long Trantqlong@vnu.edu.vnTri Thanh Nguyenntthanh@vnu.edu.vnHoang Tung Ly2020-07-29T08:16:59Z2020-07-29T08:16:59Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4035This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40352020-07-29T08:16:59ZNanomaterials for Organic Optoelectronic Devices: Organic Light-Emitting Diodes, Organics Solar Cells and Organic Gas SensorsNang Dinh Nguyendinhnn@vnu.edu.vnSi Trong Khanh TranMinh Long LamDuc Cuong Nguyencuongnd@vnu.edu.vnPhuong Hoai Nam Nguyennamnph@vnu.edu.vn2020-07-29T08:16:11Z2020-07-29T08:16:11Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4031This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40312020-07-29T08:16:11ZIndoor Positioning using BLE iBeacon, Smartphone Sensors and Distance-based Position Correction AlgorithmTuan Trinh Anh VuThi Thai Mai Dinhdttmai@vnu.edu.vnQuoc Tuan Nguyentuannq@vnu.edu.vnSandrasegaran KumbesanKumbesan.Sandrasegaran@uts.edu.au2020-07-29T08:14:46Z2020-07-29T08:15:17Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/4030This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/40302020-07-29T08:14:46ZPerformance of OFDM Based Advanced Encryption StandardCurrently, there are a lot of secure communication schemes have been proposed to hide secret contents. In this work, one of the methods deploying encryption to cipher data is represented. The primary object of this project is applying Advanced Encryption Standard (AES) in communications based Orthogonal Frequency Division Multiplexing (OFDM). This article discusses the security of the method encrypting directly QAM symbols instead of input bit-stream. This leads to improving the security of transmitting data by utilization of authentication key between the mobile and base station. The archived results demonstrate that the performance of the AES-OFDM system is completely acceptable to compare with the criteria for 4G.Duc Tai TruongQuoc Tuan Nguyentuannq@vnu.edu.vnThi Thai Mai Dinhdttmai@vnu.edu.vn