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Backup channel and cooperative channel switching on-demand routing protocol for multi-hop cognitive radio ad hoc networks (BCCCS)

Backup channel and cooperative channel switching on-demand r...

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international conference on Emerging Technologies

作者： Zeeshan, Muhammad Manzoor, Muhammad Fahad Qadir, Junaid School of Electrical Engineering and Computer Science NUST H-12 Islamabad Pakistan

ISBN: (纸本)9781424480586

Cognitive radio technology solves the problem of spectrum underutilization by allowing the unlicensed users to opportunistically access available spectrum without affecting the activity of licensed user. Channel assignment and routing in cognitive radio networks is especially challenging in networks where nodes are equipped with only a single transceiver (as is the case in commodity wireless networks that run IEEE 802.11 DCF MAC). We propose a combined framework of routing and channel assignment that exploits channel diversity in cognitive radio networks to optimize routing performance and increase the network capacity. Specifically, we propose a joint cross-layer routing/ channel assignment protocol based on AODV that works without any central control channel and accounts for the state of the links. In this paper, we propose to keep a backup channel to cater for channel heterogeneity thereby avoiding end to end reroute procedures. We also propose cooperative channel switching in which various nodes exchange routing and control information in a coordinated way. Simulation results show that our proposed backup channel approach ensures higher connectivity as compared to the single channel approach as the number of channels interfered with increases. © 2010 IEEE.

关键词： Cognitive radio

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A selective encryption approach to fine-grained access control for P2P file sharing

A selective encryption approach to fine-grained access contr...

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作者： Gupta, Aditi Sultana, Salmin Kirkpatrick, Michael Bertino, Elisa Department of Computer Science Purdue University United States Department of Electrical and Computer Engineering Purdue University United States

ISBN: (纸本)9780984589326

As the use of peer-to-peer (P2P) services for distributed file sharing has grown, the need for fine-grained access control (FGAC) has emerged. Existing access control frameworks use an all-or-nothing approach that is inadequate for sensitive content that may be shared by multiple users. In this paper, we propose a FGAC mechanism based on selective encryption techniques. Using this approach, the owner of a file specifies access control policies over various byte ranges in the file. the separate byte ranges are then encrypted and signed with different keys. Users of the file only receive the encryption keys for the ranges they are authorized to read and signing keys for the ranges they are authorized to write. We also propose an optional enhancement of the scheme where a file owner can hide location of the file. Our approach includes a key distribution scheme based on a public key infrastructure (PKI) and access control vectors. We also discuss how policy changes and file modifications are handled in our scheme. We have integrated our FGAC mechanism with the Chord structured P2P network. In this paper, we discuss relevant issues concerning the implementation and integration with Chord and present the performance results for our prototype implementation. © 2010 ICST.

关键词： Access control

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Eigenposes: Using principal components to describe body configuration for analysis of postural control dynamics

Eigenposes: Using principal components to describe body conf...

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2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010 - 2010 international Joint conference on Neural Networks, IJCNN 2010

作者： Skufca, Joseph D. Bollt, Erik M. Pilkar, Rakesh Robinson, Charles J. VA Med. Center Research Service Syracuse NY United States Center for Rehab. Engineering Science and Technology Clarkson Univ. Potsdam NY 13699-5730 United States Clarkson Univ's Math and Computer Science Dept. United States Electrical and Computer Engineering Dept. Clarkson University United States

ISBN: (纸本)9781424469178

Many studies of human postural control use data from video-captured discrete marker locations to analyze via complex inverse kinematic reconstruction the postural responses to a perturbation. We propose here that Principal Component Analysis of this marker data provides a simpler way to get an overview of postural perturbation responses. Using short (1, 4, and 16 mm) anterior platform step translations that are on the order of a young adult's normal sway path length, we find that the low order eigenmodes (which we call eigenposes) of the time-series marker data correspond dominantly to a simple anterior-posterior pendular motion about the ankle, and secondarily (and with less energy) to hip flexion and extension. A third much weaker mode is occasionally seen that is represented by knee flexion. © 2010 IEEE.

关键词： Inverse kinematics

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OpenRCL: Low-power high-performance computing with reconfigurable devices

OpenRCL: Low-power high-performance computing with reconfigu...

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20th international conference on Field Programmable Logic and Applications, FPL 2010

作者： Lin, Mingjie Lebedev, Ilia Wawrzynek, John Department of Electrical Engineering and Computer Science University of California Berkeley CA 94704 United States

ISBN: (纸本)9780769541792

this work presents the Open Reconfigurable computing Language (OpenRCL) system designed to enable low-power high-performance reconfigurable computing with imperative programming language such as C/C++. the key idea is to expose the FPGA platform as a compiler target for applications expressed in the OpenCL paradigm. To this end, we present a combination of low-level virtual machine instruction set, execution model, many-core architecture, and associated compiler to achieve high performance and power efficiency by exploiting the FPGA's distributed memories and abundant hardware structures (such as DSP blocks, long carry-chains, and registers). Our resulting OpenRCL system not only allows programmers to easily express parallelism through the API defined in the OpenCL standard but also supports coarse-grain multithreading and dataflow-style fine-grain threading while permitting bit-level resource control. An OpenRCL prototype machine with 30 processing nodes was implemented using a Virtex-5 (XCV5LX155T-2) FPGA. For the well-known Parallel Prefix Sum (Scan) problem, comparing the runtime of the same problem on a GeForce 9400m using the OpenCL SDK from Apple Inc., the OpenRCL machine demonstrates comparable performance with a 5x reduction in core power consumption. © 2010 IEEE.

关键词： Field programmable gate arrays (FPGA)

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A novel bit and power allocation scheme for OFDM system over the low voltage power line

A novel bit and power allocation scheme for OFDM system over...

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international conference on Natural Computation

作者： Zhang, Tao Zhang, Rui School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin 150080 China School of Automation Harbin University of Science and Technology Harbin 150080 China

ISBN: (纸本)9781424459612

Bit and Power allocation in adaptive orthogonal frequency division multiplexing (OFDM) systems is a crucial technique to improve spectral efficiency. Bit and power allocation based on Water-filling algorithm can obtain optimal solution in theory. Due to the modulation manner and actual integer programming requirement, optimal results of bit and power allocation can not be obtained. Cloud Particle Swarm Optimization (CPSO) algorithm is proposed in this paper. A novel evolutionary mode is given using uncertain property of cloud model to improve diversity of population and overcome the shortcoming of running into local minimum in Particle Swarm Optimization (PSO) algorithm, which can realize the balance between exploration and exploitation in search space. Dynamic reducing search space in evolutional process can improve convergence speed of algorithm proposed, accordingly the problem of bit allocation maximizing data rate under the power and bit error rate constraints over the distribution network is solved in CPSO. Numeral results demonstrate the performance of proposed algorithm is the equivalence to bit adding algorithm, accompany with reducing calculation time. At the same transmission rate the savable power in CPSO algorithm is 4.7-14.8dBm comparing with the Water-filling algorithm. © 2010 IEEE.

关键词： Integer programming

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A fourier series-based adaptive sliding-mode controller for nonlinear pneumatic servo systems

A fourier series-based adaptive sliding-mode controller for ...

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2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010

作者： Lee, Lian-Wang Li, I.-Hsum Institute of Automation and Control National Taiwan University of Science and Technology Taiwan Department of Computer Science and Information Engineering Lee-Ming Institute of Technology Taiwan

ISBN: (纸本)9781424469208

the behavior of nonlinearity and time-varying cause the pneumatic actuator systems are difficult to be controlled. this paper proposes a Fourier series-based adaptive sliding-mode controller for nonlinear pneumatic servo systems. the Fourier series-based functional approximation technique can approximate an unknown function, thus bypassing the model-based prerequisite. the learning laws for the coefficients of the Fourier-series functions are derived from a Lyapunov function to guarantee the system stability. Consequently, practical experiments on a rodless pneumatic servo system are successfully implemented with different path tracking profiles, which validates the proposed method. © 2010 IEEE.

关键词： Fourier series

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Research of TCP NAT traversal solution based on port correlation analysis & prediction algorithm

Research of TCP NAT traversal solution based on port correla...

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作者： Zhang, Lizhuo Jia, Weijia Xiao, Xun Dai, Bin Li, Huan School of Information Science and Engineering Central South University Changsha China Department of Computer Science University of Hong Kong Kowloon Hong Kong

ISBN: (纸本)9781424437092

Although solutions have been proposed for NAT traversal in UDP based P2P applications, TCP based NAT traversal still remains challenges due to the relatively complicated protocols. In this paper, we propose a Port Correlation Analysis and Prediction (PCAP) algorithm to predict the NAT allocated port number and a novel PCAP based TCP NAT traversal scheme to build successful P2P connections. We evaluate our method through experiments under real networking environments. the results demonstrate the effectiveness of PCAP algorithm on NAT behavior detection and port prediction and the system achieves higher successful P2P connection rate. © 2010 IEEE.

关键词： Transmission control protocol

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Implementing FFT using SPMD style of OpenMP

Implementing FFT using SPMD style of OpenMP

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作者： Weng, Tien-Hsiung Huang, Sheng-Wei Ro, Won Woo Li, Kuan-Ching Department of Computer Science and Information Engineering Providence University Shalu Taichung 43301 Taiwan School of Electrical and Electronic Engineering Yonsei University Seoul Korea Republic of

ISBN: (纸本)9788988678251

In this paper, we introduce a parallel version of the Fast Fourier Transform that was created using OpenMP in SPMD style. Our implementation is non-recursive and is based on the conventional Cooley-Tukey algorithm written in C. the aim of this work is show the potential benefit of writing our FFT algorithm in SPMD style which enabled an efficient use of multicore machines. Our experimental results are based on FFT code running on an AMD-Opteron TM8200 with four 2-core CPUs. the experimental results show that the performance of our new parallel code on an 8-core shared-memory machine is promising.

关键词： Fast Fourier transforms

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A remote data disaster recovery system model based on undo

A remote data disaster recovery system model based on undo

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6th international conference on Networked computing and Advanced Information Management, NCM2010

作者： Guo, Lin Yu, Zhi-Hai Li, Hai-Bo Zhang, Le-Jun Zhang, Jian-Pei College of Computer Science and Technology Harbin Engineering University Harbin 150001 China

ISBN: (纸本)9781424476718

the data disaster recovery system which based on fiber channel or remote data center is so costly. So the system does not appropriate to data security protection of small enterprises. the paper presents a distributed recovery method which based on remote data disaster recovery, and this method has some features including lower cost, deployment flexibility, high security etc. the data of application system is first intercepted by the Undo agent, and after the redundancy processing, finally it is stored in the distributed network storage system. In order to back up the discrete information of system, the Undo-manager sends a time signal to drive snapshoot device and sets restore points, at the same time, the captured data packets are analyzed by the system, according to the syntax and semantic, the system restores the action, system status, data and so on. When the data errors or data missing occurs, Undo-agent will take the whole into account and then drive snapshoot device to restore the checkpoints. the data which occurs after the checkpoint will replay by the verb restore module, in this way, the restoration of both coarse and fine grain and the normal running of recovered system are guaranteed.

关键词： Checkpoint Data replay Data security Distributed storage system Undoagent

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Keystroke-dynamics authentication against synthetic forgeries

Keystroke-dynamics authentication against synthetic forgerie...

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作者： Stefan, Deian Yao, Danfeng Department of Electrical Engineering Cooper Union New York NY 10003 United States Department of Computer Science Virginia Tech. Blacksburg VA 24060 United States

ISBN: (纸本)9780984589326

We describe the use of keystroke-dynamics patterns for authentication and detecting infected hosts, and evaluate its robustness against forgery attacks. Specifically, we present a remote authentication framework called TUBA for monitoring a user's typing patterns. We evaluate the robustness of TUBA through comprehensive experimental evaluation including two series of simulated bots. Support vector machine is used for classification. Our results based on 20 users' keystroke data are reported. Our work shows that keystroke dynamics is robust against synthetic forgery attacks studied, where attacker draws statistical samples from a pool of available keystroke datasets other than the target. TUBA is particularly suitable for detecting extrusion in organizations and protecting the integrity of hosts in collaborative environments, as well as authentication. © 2010 ICST.

关键词： Authentication

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