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检索条件"任意字段=2013 3rd International Conference on Computer Science and Network Technology, ICCSNT 2013"

共 2013 条记录，以下是71-80 订阅

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LTE Fixed-Point Handover Algorithm For High-Speed Railway Scenario 3

LTE Fixed-Point Handover Algorithm For High-Speed Railway Sc...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Tomasov, Gleb Wu, Muqing Wen, Jingrong Liu, Hui Beijing Univ Posts & Telecommun Beijing Lab Network Syst Architecture & Convergen Beijing Peoples R China

ISBN: (纸本)9781479905614

In this paper the innovative fixed-point LTE handover algorithm for the high-speed railway environment is proposed. The handover process effectiveness is researched through the measurement of information gathered by User Equipment (UE), such as the cell Reference Signal Received Power (RSRP) and the target cell Block Error Rate (BLER), which are analyzed for different points between the LTE eNodeB and UE. This paper focuses on the fixed-point handover algorithm in the LTE high-speed rail network and compares its performance with the classical A3 event algorithm. We have designed and implemented the algorithm in a dynamic system level simulator and simulated the mountain and plain environment scenarios. In the LTE simulation platform, we review the packet delay and packet loss rate simulation results and analyze their impact factor. The simulation results show that for the high-speed mobile network in both mountain and plain environment scenarios, the fixed-point handover algorithm performs better than the A3 algorithm.

关键词： LTE handover (HO) high-speed railway fixed-point handover algorithm delay packet loss ratio

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Hierarchical Cognition Cycle: Making Cognitive Radio networks More Intelligent 3

Hierarchical Cognition Cycle: Making Cognitive Radio Network...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Feng, Shuo Wu, Qihui Wang, Jinlong Zheng, Xueqiang Xu, Yuhua Ding, Guoru PLA Univ Sci & Technol Coll Commun Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781479905614

Cognitive radio (CR) is viewed as a promising technology that can bring about remarkable improvement in spectrum utilization. Different cognition cycles have been proposed to direct basic research areas in CR. However, most of the existing studies only emphasize on its functional or operational aspects regardless of the intelligent core, the essential aspect, and the external aspect of cognition cycle. In this paper, we propose hierarchical cognition cycle (HCC) as a new transdisciplinary research field to deal with the emerging situation of "data rich, information vague, knowledge poor" in cognitive radio networks (CRNs). HCC investigates the basic theories and key technologies about how to intelligently manage available resources in the complex environment to meet various demands in CRN. A comprehensive theoretical framework of HCC is established in terms of the core, essence loop, function loop, operation loop, and external loop of HCC. Furthermore, a few research challenges ahead are presented in this paper as well.

关键词： Cognitive Radio network Hierarchical Cognition Cycle Theoretical Framework Research Challenge

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Distributed and Parallel Subarray Beamforming for Near-Field 3D Sonar Imaging 3

Distributed and Parallel Subarray Beamforming for Near-Field...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Han, Yeqiang Fu, Jiabao Zhou, Fan Tian, Xiang Chen, Yaowu Zhejiang Univ Inst Adv Digital Technol & Instrumentat Hangzhou Zhejiang Peoples R China Zhejiang Prov Key Lab Network Multimedia Technol Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781479905614

The computational load is prohibitive in 3D sonar systems for real-time image generation. In the literature, an efficient frequency beamforming method based on the distributed and parallel subarray (DPS) has been introduced for planar arrays working in the far field. This paper extends the DPS beamforming algorithm to process the signals acquired from a scene in the near field. The alogrithm divides the full populated transducer array into two stage distributed subarrays. It performs parallel beamforming on the first-stage subarrays and applies the approximation for time delays in the near-field beam patterns of the second-stage subarray. The computational efficiency is significantly improved as compared with the traditional methods, while achieving the similar resolutions. In addition, a multi-FPGA signal processor is proposed for implementing the underwater 3-D imaging.

关键词： underwater 3D imaging sonar sensor array system sonar signal processing distributed and parallel subarray beamforming

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A Double-Layer Sparse Honeycomb Topology for NoC 3

A Double-Layer Sparse Honeycomb Topology for NoC

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Gao, Rong Liu, Feiyang Gu, Huaxi Fu, Xisong Xidian Univ Shenzhen CU Xidian Joint Ctr State Key Lab ISN Xian Peoples R China

ISBN: (纸本)9781479905614

network-on-chip (NoC) is emerging as an effective architecture which address the shortcomings of traditional bus based System-on-chip (SoC). Since its better properties, such as the lower power consumption, smaller size and higher scalability, mesh is often regarded as an effective topology for NoC design. In this paper, we propose a double-layer sparse honeycomb topology as a terrific design option gaining advantages of degree, diameter, and network cost which is vital to network performance. As a result of the fact that 3D IC has developed as a perspective technique for network topology, we transform the sparse honeycomb topology into rectangular brick shape that it is feasible to be implemented on the chip, and double the planar sparse honeycomb structure to obtain this advantageous 3D topology. Based on the addressed topology, a brief routing algorithm which is easy and improved from the dimension order routing algorithm is carried out. The 4x4 router for the new topology has been implemented and simulated. Thus, the degree of routers is reduced and the utilization is increased.

关键词： network-on-Chip honeycomb layout router routing algorithm

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The Research and Implementation of PCI Express Driver for DSP Based on KeyStone Architecture 3

The Research and Implementation of PCI Express Driver for DS...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Xu, Yong Jiang, Hongxu Liu, Tingshan Zhai, Donglin Lu, Jinyuan Beihang Univ Sch Comp Sci & Engn Beijing Peoples R China China United Network Commun Corp Hebei Branch Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9781479905614

As a third-generation universal I/O interconnect technology succeeding ISA and PCI bus, PCI Express has characteristics of lower pin count, higher reliability and faster transfer rate, which makes it a promising prospect. This paper studies PCI Express interface technology of DSP based on KeyStone architecture, and proposes a driver design method aimed at PCI Express interconnection between DSP and host PC. The method not only improves the data transfer rate but also reduces the difficulty of driver development, which effectively solves problem of high-speed communication. The proposed method which is verified on multi-core DSP-TMS320C6678 chip based on KeyStone architecture, obtains either read or write speed of more than 160MB/s both in Linux and Windows operating system, nearly up to 80% of theoretical bandwidth. Experimental results demonstrate that the method proposed above can effectively implement PCI Express driver development for DSP based on KeyStone architecture.

关键词： PCI Express TMS320C6678 driver development high-speed communication

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An EPA-FRT Based Dual-network Platform for Humanoid Robot Control Systems 3

An EPA-FRT Based Dual-network Platform for Humanoid Robot Co...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Lu, Hanrong Wei, Haitao Zheng, Feng Lu, Li Air Force Early Warning Acad Dept Early Warning Intelligence Wuhan Peoples R China Air Force Early Warning Acad Huangpi NCO Sch Wuhan Peoples R China Zhejiang Univ Dept Control Sci & Engn Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781479905614

In order to accomplish complex movements and interact with the environment, humanoid robots are required to be equipped with many motors, servo drivers and sensors to provide enough DOF, achieve fast responses and acquire adequate sensor data. Most interfaces that commercial servo drivers and sensors provide cannot satisfy the performance requirement as the number of drivers and sensors grows. Adopting Real-Time Ethernet is a trend in high-speed motion control scenarios such as robot systems and variable-frequency drive (VFD) control systems. This paper proposes an EPA-FRT based dual-network scheme for humanoid robot control and establishes a system that is compatible to both CAN and Ethernet interfaces. The network structure and scheduling scheme of the dual-network system are presented. A prototype test is performed and analyzed compared to the CAN bus. Experimental results show the effectiveness and advantage of the scheme.

关键词： Real-Time Ethernet Fast Real-time (FRI) Ethernet for Plant Automation (EPA) Motion control Humanoid robot component

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A Fast Method for RGB to YCrCb Conversion Based on FPGA 3

A Fast Method for RGB to YCrCb Conversion Based on FPGA

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Jiang, Hongxu Li, Hanqing Liu, Tingshan Zhang, Ping Lu, Jinyuan Beihang Univ Sch Comp Sci & Engn Beijing Peoples R China China United Network Commun Corp Hebei Branch Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9781479905614

Both RGB and YCrCb color space are often used in video image processing, along with the wide application of FPGA in the field of video image processing, RGB to YCrCb color space conversion is frequently needed on FPGA. This paper analyzes the process of RGB to YCrCb color space conversion on FPGA, and proposes a fast conversion method using look-up table and pipeline technology. Firstly, on the premise of holding accuracy, floating point numbers are expanded to integer which is convenient for FPGA processing. Secondly, aimed at the speed limitation of multiplication in conversion, multiplications are transformed to look-up tables and additions. Finally, in the course of numerous addition operations, pipeline technology is fully utilized to further improve the operation speed. The proposed method which is implemented on XC4VLX15 chip for color space conversion, obtains maximum operating frequency of 358MHz, 3.5 times faster than that of direct method. Experimental results demonstrate that the proposed method can effectively improve the speed of RGB to YCrCb color space conversion when compared with existing method.

关键词： FPGA color space fast conversion

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Research on Developing a Lab Environment for Cross Site Request Forgery Attack and Defense Education in Higher Vocational Colleges 3

Research on Developing a Lab Environment for Cross Site Requ...

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Zeng, Huangcun Guangdong Teachers Coll Foreign Language & Arts Dept Informat Technol Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781479905614

Cross Site Request Forgery (CSRF) is among the most exploited web security vulnerabilities. Yet it has received comparatively less attention. It's a must for web site administrators to protect their web sites from CSRF attacks. In order to let the students master the attack and defense skills of CSRF, it's essential to let them have the opportunity to truly practice the attacks as hackers do, and to practice the defenses as web site administrators do. Yet we haven't seen much research done in the area of developing lab environments to facilitate CSRF education in higher vocational colleges. In this paper, we have shown how teachers in higher vocational colleges can develop a simple lab environment for CSRF attack and defense education. We believe that the developed lab environment will facilitate the education of CSRF attack and defense. And we suggest that a lot more researches need to be done in the area of developments of attack and defense lab environments to improve the outcomes of network security education in higher vocational colleges.

关键词： cross site request forgery lab environment higher vocational college network security attack defense

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Research on Simulators for Peer-to-Peer Systems 3

Research on Simulators for Peer-to-Peer Systems

引用

3rd international conference on computer science and network technology (iccsnt)

作者： Zhou, Shijie Zhou, Yanghong Luo, Jiaqing Univ Elect Sci & Technol China Sch Comp Sci & Engn Chengdu 610054 Sichuan Peoples R China

ISBN: (纸本)9781479905614

Traffics produced by P2P system such as BitTorrent, Skype, etc, has been the primary networking traffic. Peer-to-peer systems can be very large and highly dynamic. Therefore, testing a new algorithm for P2P computing in real Internet is impractical and expensive. Simulation is another feasible approach to test new algorithms or investigate P2P system behaviors. Many P2P-oriented simulators have been adopted in recent years. Therefore, it definitely demands a comprehensive survey to descript and compare the main P2P simulators. In this paper, we classify P2P simulators according to some criterion. Then, we listed and analyzed the main presently available P2P-oriented simulators. Finally, we also compared these simulators according the evaluation criteria proposed by us. Our research results can be exploited by researchers and developers to choose the feasible simulator according to their simulation requirements.

关键词： network Simulation Peer-to-Peer P2P Simulation distributed Simulation simulator

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network Simulation and Evaluation for the Size Reduction of a Given Topology 5

Network Simulation and Evaluation for the Size Reduction of ...

引用

5th international conference on computer science and network technology (iccsnt)

作者： Guan, Linyu Jiao, Bo Huang, Chengdong Li, Bo Huang, Fei Liu, Yinglong Peoples Repb China 3rd Res Inst Minist Publ Secur Key Lab Informat Network Secur Shanghai 20031 Peoples R China Luoyang Elect Equipment Test Ctr Luoyang 471003 Peoples R China

ISBN: (纸本)9781509021291

Running on a size-reduction network simulated by a given large-scale topology can obviously enhance the time efficiency. In this paper, we realize the size-reduction using the input extracting of a network simulator and evaluate the similarity between the size-reduction and given topologies using multiple criterions. The evaluation result verifies that the network simulation with input extracting is effective for the size reduction.

关键词： size reduction network simulation similarity evaluation input extracting

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