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2013 IEEE Antennas and Propagation Society International Symposium, APSURSI 2013

作者： Yamaguchi, Kanako Bui, Huu Phu Ogawa, Yasutaka Nishimura, Toshihiko Ohgane, Takeo Graduate School of Information Science and Technology Hokkaido University Sapporo Japan National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Hochiminh City Viet Nam

ISBN: (纸本)9781467353175

We consider a multi-user multiple-input multiple-output (MIMO) system using block diagonalization and eigenbeam-space division multiplexing to suppress inter-user interference and inter-stream interference. In time-varying environments, the performance seriously degrades due to mistracking of beamforming. A channel prediction scheme can eliminate the effect of the time-varying environments. In this paper, using indoor measurement data, we evaluate the bit error rate (BER) performance of a multi-user MIMO system with channel prediction based on an autoregressive model. It is shown that the proposed channel prediction technique can improve the BER performance significantly. © 2013 IEEE.

关键词： Bit error rate

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A novel mechanical design of automatic laser targetscoring systems

A novel mechanical design of automatic laser targetscoring s...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Phu, Bui Huu Anh, Nguyen The Binh, Nguyen Thien Dung, Nguyen Quang National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly ThuongKiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

This paper describes mechanical design of automatic target-scoring machine. Automatic target-scoring system use array of laser beams to define coordination of bullet through. The mechanical design accord to modular easy to installation, repair and upgrades. The system includes: emitter module, detector module, adjustment mechanism, and mechanical frame. All modules were design by CAD-CAM and machined by CNC machines to high accuracy In addition, for accuracy using adjustment mechanisms to adjust modules. © (2015) Trans Tech Publications, Switzerland.

关键词： Laser beams

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Design of shielding system for impulse ground penetrating radar applications

Design of shielding system for impulse ground penetrating ra...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Phuoc, Dong Tan Phu, Bui Huu National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

In this paper, we propose a shielding system for impulse ground penetrating radar applications (GPR). The structure of shielding system is designed for our real impulse GPR application at 200 MHz central frequency for improving the deep penetration. The shielding system makes high quality of signal transmission from transmitter antenna to receiver antenna for impulse GPR system. It not only makes lowest T/R antenna coupling, high performance of antennas, preventing external noise but also reduces unnecessary air radiation which damages to the health of GPR user. A commercial absorbing material with a short thickness of 40mm is used to reduce the reflection of upper side of antenna in the cavity of shielding system. The design procedure is derived and its performance is explained. Shielding system is designed, simulated and optimized successfully in CST 2013 software. And it is fabricated with good measurement results. © (2015) Trans Tech Publications, Switzerland.

关键词： Ground penetrating radar systems

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Design of rotoformer mechanism and cooling steelconveyor in sulfur granulation systems

Design of rotoformer mechanism and cooling steelconveyor in ...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Binh, Nguyen Thien Son, Le Thanh Nam, Nguyen Thanh The, Vu Ngoc Thanh National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

The sulfur granulation roller (rotoformer) mechanism and cooling steel conveyor is important clusters in sulfur granulation system. This paper presents method to design rotoformer, apply goal: create a continuous pressure for a regular granulation on steel conveyor. There are also mechanism that granulates and maintains temperature so that sulfur is not stuck and not solidify in the supplying pipes. Moreover, this paper shows the solution to cool the steel conveyor, filter system has temperature sensors which ensure the decreasing of temperature over the length of steel conveyor. This will help the granulation of sulfur, formed sulfur will has right size and shape. © (2015) Trans Tech Publications, Switzerland.

关键词： Sulfur

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Hierarchy-based extended CBBA for multi-robot task assignment

Hierarchy-based extended CBBA for multi-robot task assignmen...

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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jiajun Xia, Weiguo Li, Fuqiang Wang, Peng China National Aeronautical Radio Electronic Research Institute National Key Laboratory of Science and Technology on Avionics System Integration China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering China

ISBN: (纸本)9781665465335

This paper studies the task assignment problem of a multi-robot system with complex constraints including the robot speed limit, the task execution time window constraints, the arrival time, the trip cost, and different priorities of the tasks. A new bidding function is then designed for each robot. Based on the k-means algorithm, a hierarchy-based extended consensus-based bundle algorithm (CBBA) is proposed to find the optimal solution for the task allocation problem. Finally, simulation examples are presented to show the feasibility of the proposed algorithm and comparisons with existing algorithms show that the proposed algorithm can reduce the task assignment time with guaranteed reward values. © 2022 IEEE.

关键词： Multipurpose robots

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Design of palletizing robot using series elastic actuator 6th

Design of palletizing robot using series elastic actuator

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6th International Conference on Advanced engineering Theory and Applications, AETA 2019

作者： Nguyen, Tan Tien Le, Quang Dung Tran, Thien Phuc Kim, Sang Bong Key Lab of Digital Control and System Engineering Ho Chi Minh City University of Technology VNU-HCM Ho Chi Minh City Viet Nam Pukyong National University Busan Korea Republic of

ISBN: (纸本)9783030530204

For along time, palletizing robot use stiffness motor to perform its movement. Its motor will be damaged easily when robot stops suddenly. This paper is about new approachment, applying series elastic actuator to control the robot because of its pros: the vibration will be controlled, controlling force without force sensor which make the robot low cost and easy to control. © Springer Nature Switzerland AG 2021.

关键词： Robots

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Performances and characteristics of DIGRank, ranking in the incomplete networks

Performances and characteristics of DIGRank, ranking in the ...

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11th IEEE International Conference on Data Mining, ICDM 2011

作者： Niu, Xiang Li, Lusong Tkach, Daniel Xiong, Xiaobing Li, He Xu, Ke State Key Lab. of Software Development Environment Beihang University Beijing China University of Science and Technology Beijing Beijing China National Digital Switching System Engineering and Technological Research Center Beijing China

ISBN: (纸本)9780769544083

PageRank has been widely used in ranking retrieval results on the web, finding the top influential papers in citation networks or detecting valuable users in online social networks. However, in practice, it is usually hard to obtain a complete structure of any above networks to rank nodes. Thus, some researchers have begun to explore how to get estimated ranks efficiently without acquiring the whole network. They have proposed some approximating methods, however, it is difficult to determine which method is the best one or which is suitable to a certain application. In this case, we set experiments in small-world and scale-free generated networks to certify the feasibility and characteristics of four approximating methods. We also use eleven real networks to mention different optimal conditions for these methods. We find the DIGRank method performs better than other local estimation methods in almost every given subgraph. Besides, Mean field approach method tends to perform well in networks that have low average shortest path length, small amount of nodes with the same low indegree, or weak community structure. Finally, we apply the most versatile method DIGRank to Sina micro-blog website to precisely classify users in a group as elites, grassroots or mummy users. © 2011 IEEE.

关键词： Social networking (online)

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A numerical simulation of incremental forming process for polymer sheets

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International Journal of Modelling and Simulation 2012年第4期32卷 265-272页

作者： Sy, Le V. Nam, Nguyen T. PetroVietnam University Hanoi Viet Nam National Key Lab for Digital Control and System Engineering HCM Viet Nam

The incremental sheet forming (ISF) technology has recently received considerable interest due to pre-eminence advantages for low-batch, high-quality, and customized products. Regarding the manufacturing of polymeric materials, this technology could be considered as potential candidate to satisfy growing requirements of low batch and customized products in very short development and production lead-times. In this paper the numerical simulation of ISF process with a cone shape in 45° wall angle, hemispherical-head tools and helical tool-paths is presented. A finite element model, implementing a viscoelasticity material model, is used to examine the deformation of ISF on polymer sheets. The simulated results were utilized to predict variances in thickness of deformed polymer sheet and geometric accuracy. Finally, the comparison between the results from numerical simulations and lab.ratory experiments carried out on a CNC machine is also presented.

关键词： Viscoelasticity

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Designing a controller for autonomous underwater vehicle using decoupled model and fuzzy logic 6th

Designing a controller for autonomous underwater vehicle usi...

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6th International Conference on Advanced engineering Theory and Applications, AETA 2019

作者： Le Ngoc Bao, Long Anh, Pham Viet Nguyen, Duy Anh National Key Lab of Digital Control and System Engineering VNU-HCM Ho Chi Minh University of Technology Ho Chi Minh City Viet Nam University of Transport Ho Chi Minh City Viet Nam

ISBN: (纸本)9783030530204

The increasing demands of exploring and researching underwater are still developing worldwide. Since people can hardly reach such environments, Autonomous Underwater Vehicles (AUVs) are invented to take place instead. There are many types of controller and models that often used in AUV control, but in this paper, we are going to discuss about decoupled model, which can be expressed at a combination of three separate linearized sub-systems that control three main movements of an AUV, called surge control, steering control and depth control. The control torques are determine through three separate Fuzzy Logic controllers (FLCs) to finally achieve the state with acceptable errors. In the simulation part, we will show how the FLCs control the sub-systems in decouple model separately, as well as the whole system and evaluate their performances. © Springer Nature Switzerland AG 2021.

关键词： Autonomous underwater vehicles

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A bandwidth smoothing algorithm applied in streaming media system upon home network

A bandwidth smoothing algorithm applied in streaming media s...

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2010 2nd International Conference on Education Technology and Computer, ICETC 2010

作者： Wang, Haiwei Zhu, Xiaoyong Ni, Hong Sun, Peng Key Lab. of Network Communication System and Control USTC Chinese Academy of Sciences Hefei China National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781424463688

Bandwidth smoothing can increase the utility of network bandwidth by reducing the burstiness of a VBR (variable bit rate) video stream. To guarantee the quality of service of video-on-command service in home network, data transmission rate should not exceed the maximum data handling capacity of embedded terminals. This paper designs a streaming media system in home network, and puts forward a smoothing algorithm based on greedy algorithm for transmitting VBR video streams subjected to maximum data transmitting rate. The presented algorithm can decrease startup delay of streaming and meet the demand of client buffering requirement under the constraint of maximum transmission rate. Experiment results demonstrate the effectiveness of the presented algorithm. © 2010 IEEE.

关键词： Home networks

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