VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T20:55:25ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2018-12-18T02:56:13Z2018-12-18T02:56:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3333This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/33332018-12-18T02:56:13ZA Compact AWPC Antenna for DOA estimationAntennas without phase center (AWPC) have been used for Direction-of-Arrival estimation. However, these structures, being symmetric, always face the whole-space ambiguity problem. This paper proposes a new asymmetric AWPC structure for DOA estimation that is able to resolve the ambiguity in the whole space. In addition, the structure is optimized in such a way that it is compact and isotropic. Simulated results indicate the effectiveness of the proposed structureThi Thuy Quynh Tranquynhttt@vnu.edu.vnLinh Trung Nguyenlinhtrung@vnu.edu.vnAnh Phanphananh@rev.org.vnKarim Abed-Meraimkarim.abed-meraim@univ-orleans.fr2017-07-24T02:51:42Z2017-07-24T02:51:42Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2559This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25592017-07-24T02:51:42ZUsing multiple sensors for autonomous mobile robot navigationThis paper presents the use of multi-sensor measurement system to guide autonomous mobile robot in the house. The system allows the 3D image acquisition to global mapping, and algorithms to reduce the dimensionality of images to 2D global map navigation, trajectory design approach using the Lyapunov function method and avoid obstacles bythe potential energy can also be presented. Also, sensor integrated method based on extended Kalman filter allows us to identify the exact location and orientation of the robot in the presence of interference from the environment.Thuan Hoang TranManh Duong Phungduongpm@vnu.edu.vnAnh Viet Dangvietda@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2017-07-24T02:51:24Z2017-07-24T02:51:24Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2556This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25562017-07-24T02:51:24ZStabilization control of networked mobile robot using past observation-based preditive filterThis paper addresses the stabilization control problem for networked mobile robot subject to communication delay. A new state estimation filter namely past observation-based predictive filter is developed. This filter enables the prediction of system state from delayed measurement. The state estimator combined with developed control laws ensures the asymptotic stability of the networked system. Simulations with parameters extracted from a real robot system were conducted and results confirmed the correctness as well as applicability of proposed approach.Manh Duong Phungduongpm@vnu.edu.vnThi Thanh Van Nguyenvanntt@vnu.edu.vnThuan Hoang TranQuang Vinh Tranvinhtq@vnu.edu.vn2017-07-24T02:51:12Z2017-07-24T02:51:12Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2554This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/25542017-07-24T02:51:12ZStabilization Control of the Differential Mobile Robot Using Lyapunov Function and Extended Kalman FilterThis paper presents the design of a control model to navigate the differential mobile robot to reach the desired destination from an arbitrary initial pose. The designed model is divided into two stages: the state estimation and the stabilization control. In the state estimation, an extended Kalman filter is employed to optimally combine the information from the system dynamics and measurements. Two Lyapunov functions are constructed that allow a hybrid feedback control law to execute the robot movements. The asymptotical stability and robustness of the closed loop system are assured. Simulations and experiments are carried out to validate the effectiveness and applicability of the proposed approach.Thuan Hoang TranManh Duong Phungduongpm@vnu.edu.vnThi Thanh Van Nguyenvanntt@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2016-12-27T07:15:51Z2016-12-27T07:15:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2108This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/21082016-12-27T07:15:51ZStimulated Raman scattering effect in the Silica-alumina fibersWe present experimental results of stimulated Raman scattering in silica-alumina fiber using the optical pump power combination scheme of middle-power laser diodes at wavelength of 1470-1471 nm. The optical single-pass gain of Raman fiber amplifier achieved up to 11 dB in the CW and 2.5 GHz modulated signal regimes at wavelength range of 1550 nm when the pumped power is of 29.54 dBm (900 mW) in silica-alumina optical fiber with the fiber length of 65-85 Km. This distributed-pump Raman fiber amplifier can be used in high-speed long-haul DWDM fiber optic communication networks.Thanh Son PhamThe Anh NguyenThuy Van NguyenThi Hong Cam HoangHuy BuiXuan Vinh HaTrung Ninh Buininhbt@vnu.edu.vnVan Hoi Phamhoipv@ims.vast.ac.vn2016-12-19T16:38:19Z2016-12-19T16:38:19Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2013This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/20132016-12-19T16:38:19ZOn Optimization of Antennas without Phase Center for DOA estimationAntennas without phase center (AWPC) are applied to resolve the less-sensors-than-sources problem in direction-ofarrival (DOA) estimation using subspace methods, typically, the well-known multiple signal classification (MUSIC) algorithm. This paper focuses on optimization of some design parameters of such antennas, including the rotation angle, the rotation step number and distances of two dipole couples, in order to improve the ambiguity and accuracy of all estimators which use AWPC structure. These optimization problems are formulated and solved by using Cramer-Rao bound (CRB) and ambiguity checking criteria. Specially, the parameters were optimized to avoid issues related to the ambiguity for half space localization problem while minimizing the CRB for improving the DOA estimation accuracy.Thi Thuy Quynh Tranquynhttt@vnu.edu.vnLinh Trung Nguyenlinhtrung@vnu.edu.vnAnh Phanphananh@rev.org.vnAbed Meraim Karimkarim.abed-meraim@univ-orleans.fr2016-12-17T16:11:16Z2016-12-17T16:11:16Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2091This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/20912016-12-17T16:11:16ZThe Effects of ASE Noise on the Performance of Multi-wavelength OCDMA Systems using APD ReceiverTrung Ninh Buininhbt@vnu.edu.vnVan Hoi Phamhoipv@ims.vast.ac.vn2016-12-05T03:42:34Z2016-12-05T03:42:34Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2093This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/20932016-12-05T03:42:34ZStimulated Raman scattering effect in the Silica-alumina fibersTrung Ninh Buininhbt@vnu.edu.vnThanh Son PhamThe Anh NguyenThuy Van NguyenThi Hong Cam HoangHuy BuiXuan Vinh HaVan Hoi Phamhoipv@ims.vast.ac.vn2016-12-05T03:32:53Z2016-12-05T03:32:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2088This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/20882016-12-05T03:32:53ZThe Effects of EDFA Noise on the Performance of Multi-wavelength OCDM-based Long-Reach Passive Optical NetworksIn this paper, we propose a model of Long-reach Passive Optical Network (LR-PON) using multi-wavelength optical code-division multiplexing (OCDM) and Erbium-doped fiber amplifier (EDFA). In addition, we analyze the effects of EDFA noise on the performance of OCDM-based LR-PON. Other noise and interference such as shot noise, thermal noise, beat noise, and multiple-access interference (MAI) are included in our theoretical analysis and simulation. We found that the location of EDFA on the link between OLT and ONUs plays an important role in network design since it affects network performance. According to the simulation results, to achieve low bit error rate, the EDFA should be located around 15 to 25 km from OLT when total link distance of 90 km.Trung Ninh Buininhbt@vnu.edu.vnThe Ngoc Dangngocdt@ptit.edu.vnTuan Anh Phampham@u-aizu.ac.jp2015-11-13T07:51:57Z2016-12-07T15:48:27Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/1390This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/13902015-11-13T07:51:57ZModified Distorted Born Iterative Method for Ultrasound Tomography by Random SamplingDuc Tan Trantantd@vnu.edu.vnLinh Trung Nguyenlinhtrung@vnu.edu.vnNgoc Minh Do2015-11-13T07:17:14Z2015-11-13T07:22:03Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/95This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/952015-11-13T07:17:14ZEnhanced SWIFT Acquisition with Chaotic Compressed Sensing by Designing the Measurement Matrix with Hyperbolic-Secant SignalsMinh Chinh TruongDuc Tan Trantantd@vnu.edu.vnLinh Trung NguyenLuong MarieN. Do Minh2015-11-13T07:15:22Z2015-11-13T07:15:22Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/91This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/912015-11-13T07:15:22ZAn efficient scheme of Inertial Navigation System and Global Positioning System Integration for land vehicles.Land vehicle navigation system technology is a fastest growing section of focus for research recently due to its potential for both consumer and business vehicle markets. Global Positioning System (GPS) is a conventional choice in such systems. However, GPS alone is incapable of providing continuous and reliable positioning, because of its inherent dependency on external signals. The availability of low cost MEMS inertial sensors is now making it feasible to use Inertial Navigation System (INS) in conjunction with GPS to fulfill the demands of such systems. This paper therefore proposes an INS/GPS scheme which uses two Kalman Filters to filter and estimate the navigation parameters. The simulation based on experiment data and performance analysis are also present to show the positioning capability of the GPS/INS integrated systems for land vehicle navigation system and investigates on methods to improve its performance.Duc Tan Trantantd@vnu.edu.vn2015-11-13T07:12:14Z2015-11-13T07:14:39Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/89This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/892015-11-13T07:12:14ZPerformance Comparison between Simulation and Experimentation of a Specific Indoor Propagation SystemWireless communication are popular used for commercial, industrial, and domestic networking. Ensuring information quality in indoor environments are difficult but essential for applications that require higher and higher quality such as internet access, telephone, etc. In order to deploy in actual systems with the feasibility and cost savings, electromagnetic simulations must be performed carefully. The simulation of electromagnetic wave propagation in indoor environments may require the use of different wave propagation models. Some factors such as obstructions, materials, antenna installation, etc. will affect the actual results so they need to be put into simulation. This paper presented the simulation and experimentation of wave propagation in a specific building. The initial results show the feasibility to apply in practice.Duc Tan Trantantd@vnu.edu.vn2015-11-12T07:34:57Z2017-01-02T10:27:20Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/86This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/862015-11-12T07:34:57ZA Piezoresistive Acceleration Sensor: from System to Physical LevelsIn this paper, we focus to design and simulation of a piezoresistive accelerometer using
three different soft-wares corresponding to three different levels: system, device, and physical ones. At
the system level, MATLAB software was utilized to model a simple mechanical damping system. At
the device level, we have used SUGAR/MATLAB to investigate the basic behaviors of 3-DOF
accelerometer. Consequently, the ANSYS finite-element software has been used to design and
simulate the advance properties of a 3-DOF piezoresistive accelerometer. At this level, we would also
perform optimization process for the fabrication step.Duc Tan Trantantd@vnu.edu.vn2015-04-03T16:18:15Z2015-04-03T16:18:15Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/410This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/4102015-04-03T16:18:15ZData Reduction Algorithms for Wireless Sensor Networks in Environment Monitoring and Warning ApplicationsThis work presents an algorithm that can monitor the environment frequently, informing of sudden changes in the data and warn of over-threshold of data, while reducing data transfer to the sink node in order to reduce energy consumption. In the experiments executed, the results show that monitoring, informing and warning networks are worked completely when this algorithm is embedded for sensor nodes of wireless sensor networks respectively. Producing experiments measuring water level and temperature via a wireless sensor network, the received results show that the information at sink node including usual environment data, sudden changing environment data and data-overflow of pre-defined threshold is preserved. Using this algorithm the numbers of total sensed data which are sent to the sink node are decreased, and the energy consumption of sensor nodes is saved effectively. The sensor node saves energy, thus the lifetime of whole network is prolonged.Dao Vy Vuongvyvd@vnu.edu.vnHoai An TrinhNghe Vuong DaoDinh Tu BuiQuang Du Hoa2013-03-27T06:24:30Z2017-01-06T09:07:36Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/137This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1372013-03-27T06:24:30ZControl of Internet-Based Robot Systems using Multi Transport ProtocolsThis paper proposes a novel approach to implement communication channels for Internet-based robotic systems. The exchange information between the operator and the robot is classified into categories with specific features and requirements. Appropriate transport protocols are utilized for each set of data. The TCP is for the administrative data; the UDP is for the control signals and the RTP is for the vision data. Simulations and experiments show that this approach strengthens advantages of each transport protocol while maintains good performance of the system.Manh Duong Phungduongpm@vnu.edu.vnThuan Hoang TranThi Thanh Van Nguyenvanntt@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2013-03-27T06:15:17Z2015-11-12T07:54:06Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/139This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1392013-03-27T06:15:17ZMulti-Sensor Perceptual System for Mobile Robot and Sensor Fusion-Based LocalizationThis paper presents an Extended Kalman Filter (EKF) approach to localize a mobile robot with two quadrature encoders, a compass sensor, a laser range finder (LRF) and an omni-directional camera. The prediction step is performed by employing the kinematic model of the robot as well as estimating the input noise covariance matrix as being proportional to the wheel's angular speed. At the correction step, the measurements from all sensors including incremental pulses of the encoders, line segments of the LRF, robot orientation of the compass and deflection angular of the omni-directional camera are fused. Experiments in an indoor structured environment were implemented and the good localization results prove the effectiveness and applicability of the algorithm.Thuan Hoang TranManh Duong Phungduongpm@vnu.edu.vnThi Thanh Van Nguyenvanntt@vnu.edu.vnAnh Viet Dangvietda@vnu.edu.vnQuang Vinh Tranvinhtq@vnu.edu.vn2013-03-27T06:10:17Z2013-06-29T04:20:32Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/150This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1502013-03-27T06:10:17ZPerformance Comparison Between Simulation and Experimentation of a Specific Indoor Propagation SystemDuc Tan Trantantd@vnu.edu.vnN. D. AnhC. M. ThangB. L. P. LinhThi Thuy Quynh TranD. H. Hoang2013-03-27T06:07:20Z2013-06-29T04:15:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/149This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1492013-03-27T06:07:20ZA Simplified Control for Robot ConvoyDuy-Hung Phamhungpd@vnu.edu.vnQuang-Vinh Tranvinhtq@vnu.edu.vnTrung-Dung Ngo2013-03-26T16:05:32Z2016-08-31T10:03:56Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/133This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1332013-03-26T16:05:32ZNovel Active Contour Model for Image Segmentation Based on Local Fuzzy Gaussian Distribution FittingQ.T. ThieuMarie LuongJ.-M. RocchisaniLinh Trung Nguyenlinhtrung@vnu.edu.vnE. Viennet2013-03-26T16:01:32Z2013-06-29T04:16:36Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/132This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1322013-03-26T16:01:32ZDesign and Implementation of Backtracking Wave-pipeline Switch to Support Guaranteed Throughput in Network-on-ChipPhi-Hung Phamhungpp@vnu.edu.vnJongsun ParkPhuong MauChulwoo Kim2013-01-25T07:28:22Z2013-06-29T04:22:23Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/124This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1242013-01-25T07:28:22ZDesign of a Dual-Band Omni-Directional Microstrip Antenna for Smart Mobile PhonesA dual-band omni-directional antenna for smart mobile phones, ordered by a manufacturer of mobile phones in Vietnam, has been designed and tested. The results from the designed model, which fits the housing required by the manufacturer, have been compared with data from literature. A sample of the designed model has been fabricated and measured. Good agreement of simulated and measured data has been obtained.Duc Tiep VuVu Bang Giang Truonggiangtvb@vnu.edu.vn2013-01-25T07:19:17Z2016-12-07T15:47:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/120This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1202013-01-25T07:19:17ZEnhanced Time Synchronization in IEEE 802.11a System using SIGNAL Field and MAP Channel EstimationThis paper addresses the problem of time synchronization in the IEEE 802.11a OFDM wireless communication system.In addition to the reference sequence usually used in conventional algorithms, recently the SIGNAL field of the physical packet has been exploited to improve the coarse time synchronization. To increase the performance of the fine time synchronization, we propose to use joint time synchronization and channel estimation based on the Maximum A Posteriori Probability criterion. Simulation results show that the probability of synchronization failure of the proposed synchronization algorithm is reduced as compared to existing methods.Cong Luong Nguyenluong.nguyen@univ-paris13.frAnissa MokraouiPierre DuhamelLinh Trung Nguyenlinhtrung@vnu.edu.vn2013-01-25T07:17:18Z2013-06-29T04:17:02Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/129This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1292013-01-25T07:17:18ZElectro-Optic Modulator Drift Compensation based on DSP SystemToan Thang PhamVan Yem VuGia-Duong Bachduongbg@vnu.edu.vnBernard Journet2013-01-25T07:15:41Z2016-12-07T15:47:57Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/128This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1282013-01-25T07:15:41ZWhole-Space Ambiguity Removal in DOA Estimation by AWPC AntennaAntennas without phase center (AWPC) have been used to estimate direction of arrival (DOA) specially in less sensors than sources case. The similarity of two or more steering vectors corresponding to widely separated directions in the array manifold causes ambiguity in the DOA estimation. Recently, \textit{half}-space ambiguity resolution has been done by optimizing the structure of the AWPC, based on Cramer-Rao bound. This paper further proposes a novel method for resolving \textit{whole}-space ambiguity in the DOA estimation by using a uniform circular array (UCA) with multiple optimal AWPC sensors. The optimal number of AWPC sensors in moderate-size UCAs is also obtained by numerical optimization.Thi Thuy Quynh Tranquynhttt@vnu.edu.vnLinh Trung Nguyenlinhtrung@vnu.edu.vnAnh Phanphananh@vnu.edu.vnKarim Abed-Meraim2013-01-23T08:41:50Z2013-06-29T04:13:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/127This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1272013-01-23T08:41:50ZStudy, Design, and Fabrication of Power Amplifier Module to be Used for Low-Attitude Radar System Operating at UHF Band (820MHz; 900MHz)In this paper, we introduces the configuration of a high-power solid- state transmitter to be used for modern radar system operating at UHF band (820Mhz; 900Mhz). Specially, the power amplifier module (150W output power) does play a critically important role in such a system being consisting of two-stage 90W-and-200W amplifier that allows the output to reach up to 1.2kW per block, and even approximate 9.6 kW to whole system using the classical power combination method. Our work mainly targets to present the study, design, and fabrication of both 150-Watt basic module and high-power Wilkinson method, which are the key components in the topology. The design and simulated results were carried out by the microwave engineering professional design software, known as ADS2008 package. The achieved results meet the demand of modern radar transmitter. All simulations and experimental results will be reported.Duc Long Hoanglonghd@vnu.edu.vnGia-Duong Bachduongbg@vnu.edu.vn2013-01-23T08:19:28Z2013-06-29T04:18:51Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/126This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1262013-01-23T08:19:28ZThe Application of a Multibeam Antenna for 4GThere are various antenna schemes which can be used to increase the throughput of the 4th mobile generation (4G) networks such as antenna diversity, beamforming, spatial multiplexing and MIMO (Multiple Input Multiple Output) 1. With the above antenna schemes OFDMA (Orthogonal Frequency Division Multiple Access) is a suitable selection for 4G. This paper proposes a multibeam antenna combining OFDMA for the next generation mobile communications. Analysis and simulation show that this kind of antenna is comparable to MIMO scheme and can be applied to 4G.Cao Quyen Tranquyentc@vnu.edu.vnAnh Vu Trinhvuta@vnu.edu.vn2013-01-23T08:15:41Z2013-06-29T04:13:40Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/125This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1252013-01-23T08:15:41ZPerformance of Network Coding Enabled Diversity Relay NetworksCooperative network coding is considered as a novel technology that integrates cooperative communications with network coding to improve the throughput and robustness of the network. In this paper, a network coding enabled cooperative network with multiple relays is considered, under Rayleigh fading. The outage probability of this network is analyzed and showed to be superior to the traditional network with multiple relays.Sinh Cong Lamcongls@vnu.edu.vnQuoc Tuan Nguyentuannq@vnu.edu.vnPierre Duhamelpierre.duhamel@lss.supelec.fr2012-12-26T04:43:26Z2013-06-29T04:19:22Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/90This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/902012-12-26T04:43:26ZThe Performance Improvement of a Low-Cost INS/GPS Integration System using the Street Return Algorithm and Compass SensorNowadays, navigation and guidance is widely applied in many different fields. The high accuracy is very important and necessary in most of applications, but it sometimes needs to have a balance between cost and performance of navigation system. Hence, there are many new algorithms, new integrated methods are proposed to integrate or embed into low-cost INS/GPS integration systems to enhance accuracy, to reduce size and have an acceptable cost. In the recent study of our group, we have succeeded in finding out a new algorithm named Street Return Algorithm and embedding into a low-cost INS/GPS integration system. However, that research only obtains high accuracy when errors determined by INS are traverse of roads but in remanent cases the accuracy could not determine. In this paper, we have theoretically proposed to use a compass sensor and a corresponding algorithm with this kind of sensor in order to overcome that limitation. Duc Tan Trantantd@vnu.edu.vn2012-11-14T03:06:28Z2013-06-29T04:19:49Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/64This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/642012-11-14T03:06:28ZSimulation and Design of a 3-DOF Piezoresistive Accelerometer with Uniform ResolutionDuc Tan Trantantd@vnu.edu.vn2012-11-12T02:40:01Z2013-06-29T04:22:42Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/61This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/612012-11-12T02:40:01ZDesign of a Dual-band Omni-directional Microstrip Antenna for Smart Mobile Phones A dual-band omni-directional antenna for smart mobile phones, ordered by a R&D of mobile phones in Vietnam, has been designed and tested. The results from the designed model, which fits the housing required by the manufacturer, have been compared with data from literature. A sample of the designed model has been fabricated and measured. Good agreement of simulated and measured data has been obtained.Duc Tiep VuVu Bang Giang Truonggiangtvb@vnu.edu.vn2012-11-12T02:32:20Z2013-06-29T04:22:02Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/60This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/602012-11-12T02:32:20ZA Dual-band Microstrip Antenna for Mobile HandsetsAntennas are essential parts of wireless communication systems for various applications such as satellite, radar, broadcasting, wireless LANs and mobile, etc. In the literature, there have been a lot of papers, which have presented dual-band antennas for mobile phones. However, each of them will serve in a specific mobile phone. Among the most constraint requirements such as gain, radiation pattern, impedance, etc., fitting the antenna to the housing (casing) also plays an important role. Each mobile phone will have a different cover (casing), which hosts the whole components such as circuits, LCD display, keyboard, battery, etc. When a mobile phone manufacture wants to produce a new version of mobile phones, they must also design the new casing which also spares a specific place inside to host the antenna. For this reason, each new mobile phone will require a new antenna. In our paper, a sample of dual-band antenna for 3G mobile handsets, ordered by a manufacturer of mobile phones in Vietnam, has been designed. The results from the designed model, which fits the housing required by manufacturer, have been compared with data from literature and very good agreement has been obtained. Duc Tiep VuVan Ninh NguyenVan Bien LeVu Bang Giang Truonggiangtvb@vnu.edu.vn2012-11-06T09:01:20Z2017-06-10T12:02:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/59This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/592012-11-06T09:01:20ZMulti-Guider and Cross-Searching Approach in Multi-Objective Particle Swarm Optimization for Electromagnetic ProblemsThe main difference between single and multi-objective optimizations using particle swarm optimization is how the guider to locate the global optimal and Pareto optimal solutions are defined in corresponding optimization problems. In general multi-objective particle swarm optimization, only one guider is selected, and, in order to reduce the non-dominated solution for more diversity in the external archive, only crowding distance in objective space is considered. This paper presents a new approach of selecting multiple guiders to lead a swarm toward a Pareto-front. Additionally, in order to overcome the local Pareto front, mutation operator is applied for not only particles but also members in an external archive. Furthermore, aside from considering the crowding distance of solutions in objective space to maintain the diversity of solutions, the crowding distance in variable space is also taken into account. The proposed algorithm is compared with recent approaches of multi-objective optimizer in solving a multi-objective version of the TEAM 22 benchmark optimization problem with three and eight design variables.Minh Trien Phamtrienpm@vnu.edu.vnDiahai ZhangChang Seop Koh2012-11-02T02:28:57Z2017-01-17T02:34:39Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/41This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/412012-11-02T02:28:57ZA Hardware Architecture for Intra Prediction in H.264/AVC EncoderMPEG-4 AVC, so called H.264/AVC, is the latest video compression standard focusing on network transport and
storage of digital multimedia. In H.264 system, the intra prediction module is one of the most essential parts and it is different from the previous video compression standards. With the new prediction techniques, intra prediction in H.264 improves the bit rate but it also increases the memory bandwidth and the computational complexity with many prediction modes. In this work, the intra prediction procedure is fully analyzed. Based on the analysis, a hardware architecture for intra prediction focused on
main profile of H.264/AVC is proposed. The proposed architecture uses an adder tree to generate the predicted pixels for all prediction modes. The cost calculation method is Sum of Absolute Transformed Difference (SATD) and mode decision is the full search scheme. The proposed architecture can do intra prediction of an HDTV input in real-time and it is successfully simulated using Modelsim and synthesized using Xilinx ISE 10.1.Duy Hieu Buihieubd@vnu.edu.vnVan Huan Tranhuantv@vnu.edu.vnVan Mien Nguyenmiennv@vnu.edu.vnDuc Hoang NgoXuan Tu Trantutx@vnu.edu.vn2012-11-01T08:31:04Z2017-01-17T02:35:10Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/40This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/402012-11-01T08:31:04ZA SystemC based Simulation Platform for Network-on-Chip ArchitecturesAs a promising solution for on-chip communication of large systems, the Network-on-Chip paradigm has been studied and developed by many research groups with different approaches. To bring the NoC paradigm into applications, designers have to prove their proposed NoC architectures through hardware description language (HDL) based simulations, or even through silicon test chip. Most of HDL based simulations have been implemented with low level HDLs, usually at register-transfer-level (RTL), requiring a huge amount of the simulation time. In this work, we propose a simulation platform modeled in SystemC to help designers to simulate their NoC designs with different parameters to meet the requirements of targeted applications. The proposed platform supports two-dimension topologies with a variable size of the network. The platform configuration, including platform parameters as well as communication patterns, is easily set by a shell bash. As a result, by using this platform, designers can simulate the network architecture and evaluate the network performance with a very short simulation time.Van Thanh Vu Levulvt@husc.edu.vnDien Tap Ngotapnd@vnu.edu.vnXuan Tu Trantutx@vnu.edu.vn2012-11-01T08:18:46Z2017-01-17T02:34:03Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/37This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/372012-11-01T08:18:46ZSimulation and Performance Evaluation of a Network-on-Chip Architecture based on SystemCThe Network-on-Chip (NoC) paradigm has been recently known as a competitive on-chip communication solution for large complex systems such as multi-core and/or many-core systems thanks to its advantages. However, one of the main challenging issues for NoC design is that the network performance should be rapidly and early pre-proved for target applications.
In this paper, we present a NoC simulation and evaluation platform allowing designers to simulate and evaluate the NoC performance with different network configuration parameters. The proposed platform has been implemented in SystemC to be easily modified to adapt different simulation strategies and to save the simulation time. With this platform, designers can deal with: (i) configuring the network topology, flow control mechanisms and routing algorithm; (ii) configuring various regular and application specific traffic patterns; and (iii) simulating and analyzing the network performance with the assigned traffic patterns in terms of latency and throughput. Obtained results with a 4x4 2D-mesh NoC architecture will be presented and discussed in this paper to demonstrate the proposed platform. Thanh Vu Le-Vanvulvt@husc.edu.vnXuan Tu Trantutx@vnu.edu.vnDien Tap Ngotapnd@vnu.edu.vn2012-11-01T07:55:24Z2017-01-17T02:33:16Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/36This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/362012-11-01T07:55:24ZAn Efficient Context Adaptive Variable Length Coding Architecture for H.264/AVC Video EncodersIn this paper, we present an efficient hardware implementation of a Context Adaptive Variable Length Coding (CAVLC) module for an H.264/AVC video encoder. To improve timing performance, a three-stage pipeline architecture is proposed including: input data statistical analysis, encoding and packing. The context information and coding tables are stored in memory elements. To minimize the hardware implementation overhead and increase the system performance, in some sub-encoders, the codewords are calculated on-the-fly instead of being stored in look-up tables. The proposed architecture has finally been implemented using a low power CMOS 65nm technology from STMicroelectronics. The design is able to operate up to 715MHz. At 550MHz, the design complexity is 33Kgates for a power consumption of 20mW. The design is initially targeted to CIF video format; however, it is obviously suitable for real-time HD 1080p video format.Ngoc Mai Nguyenmainn@vnu.edu.vnXuan Tu Trantutx@vnu.edu.vnPascal Vivetpascal.vivet@cea.frSuzanne Lesecq