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On the relevance of network topologies in distributed video-on-demand servers

On the relevance of network topologies in distributed video-...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： L. Souza A. Ripoll X.Y. Yang E. Luque F. Cores Computer Architecture & Operating System Department Universitat Authnòma de Barcelona Spain Computer Science & Industrial Engineering Universitat de Lleida Spain

Distributed video-on-demand servers (DVS) are proposed as a solution to the limited streaming capacity and null scalability of large-scale centralized systems. Server interconnection topology plays an important role in video-on-demand systems' performance. This paper presents an analysis of different topologies and their influence over storage management and distribution, delivery policies performance, refusing requests occurrence, network consumption and scalability. To accomplish the proposal study, we have designed a complete simulation framework for DVS systems. Experimental results obtained under different workload conditions allow us to draw two important conclusions: First, a better connectivity implies a lower mean request service distance and lesser network requirements, improving multicast policies efficiency. Second, topology regularity is essential, as it allows a greater traffic balancing and provides more alternative routing paths. The analysis of global results shows that hypercube presents the best trade-off among all the evaluated metrics, providing a gradual and unlimited scalability for the DVS system.

关键词： Network topology Network servers Voltage control Scalability Streaming media Large-scale systems Performance analysis Proposals Telecommunication traffic Traffic control

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NIR Optical-Property Images of Heterogeneous Intra-lipid Phantom

NIR Optical-Property Images of Heterogeneous Intra-lipid Pha...

引用

IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Min-chun Pan Chien-hung Chen Min-cheng Pan Department of Mechanical Engineering University System of Taiwan Jhong Li Taiwan Department of Computer Science and Information Engineering Tung Nan Institute of Technology Taipei Taiwan

The paper studies the tomography reconstruction of the intra-lipid phantom measured with near infrared (NIR) light (800 nm) using a tomographic scanning device in the DC domain, where the homogenous intra-lipid phantom as the normal tissue is inserted with another different volume density one as a tumor. In our research, the instrument of continuous wave as implied by the name employs continuous-wave light as a light source where the measurement of emerging light can yield the wavelength dependent attenuation. With comparing the difference between the homogeneous and the heterogeneous phantoms, 1-D signal measurement indicates the angular position of the inclusion. Following the measuring procedure, the numerical simulation to reconstruct tomographic images of optical properties was performed using 16 by 16 sources/detectors combination and the initial guess with a homogenous background for all cases where the finite element (FE) analysis was implemented. With the use of real measured data, promising results of tomographic absorption and diffusive image are successfully reconstructed

关键词： Imaging phantoms Tomography Optical attenuators Image reconstruction Wavelength measurement Density measurement Volume measurement Neoplasms Instruments Light sources

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Evolutionary Programming With Only Using Exponential Mutation

Evolutionary Programming With Only Using Exponential Mutatio...

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Congress on Evolutionary Computation

作者： H. Narihisa K. Kohmoto T. Taniguchi M. Ohta K. Katayama Department of Information & Computer Engineering Faculty of Engineering Okayama University of Science Okayama Japan School of Biology-Oriented Science and Technology Department of Intellgence System Kinki University Kinokawa Wakayama Japan

The individual of population in standard self-adaptive evolutionary programming (EP) is composed as a pair of objective variable and strategy parameter. Therefore, EP must evolve both objective variable and strategy parameter. In standard evolutionary programming (CEP), these evolutions are implemented by mutation based on only Gaussian random number. On the other hand, fast evolutionary programming (FEP) uses Cauchy random number as evolution of objective variable and exponential evolutionary programming (EEP) uses exponential random number as evolution of objective variable. However, all of these EP (CEP, FEP and EEP) commonly uses Gaussian random number as evolution of strategy parameter. In this paper, we propose new EEP algorithm (NEP) which uses double exponential random number for both evolution of objective variable and strategy parameter. The experimental results show that this new algorithm (NEP) outperforms the existing CEP and FEP.

关键词： Genetic programming Genetic mutations Evolution (biology) Probability distribution Distributed computing Exponential distribution Evolutionary computation Artificial intelligence Genetic algorithms Functional programming

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An Effective Policy Management Framework Using RBAC model for Service Platform based on Components

An Effective Policy Management Framework Using RBAC model fo...

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International Conference on Software engineering Research, Management and Applications (SERA)

作者： Eun-Ae Cho Chang-Joo Moon Dae-Ha Park Doo-Kwon Baik Software System Laboratory Department of Computer Science & Engineering Korea University Seoul South Korea Department of Computer Science Konkuk University Chungju Chungcheongbuk South Korea Department of Computer and Information Science Korea Digital University Korea University Seoul South Korea

User access control is one of the core parts in the developing Internet field. However, in home network service platform and Web service platform, there is no concrete research yet. Therefore, in this paper, we propose the supplemented authorization policy management framework based on RBAC model in the network environment, especially, OSGi service platform and Web service platform. The proposed access control framework tries to enhance the efficiency, assure the privacy, and provide the convenience at the same time. In conclusion, we provide the base to implement the service platform by proposing the effective, safe and convenient framework in authorization and user administration part

关键词： Authorization Web services Access control Authentication Object oriented modeling Home automation Privacy computer science Environmental management Application software

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Access Control Policy Management Framework based on RBAC in OSGi Service Platform

Access Control Policy Management Framework based on RBAC in ...

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International Conference on computer and Information Technology (CIT)

作者： Eun-ae Cho Chang-joo Moon Dae-ha Park Doo-kwon Baik Software System Laboratory Department of Computer Science & Engineering Korea University of Technology and Education Seoul South Korea Department of Computer Science Konkuk University Chungju Chungcheongbuk South Korea Department of Computer and Information Science Korea Digital University Seoul South Korea

The OSGi provides a service platform which ensures the interoperability between heterogeneous technologies and various devices in home network environment. Nowadays, user access control is one of the core parts which should be cleared, but there are no concrete researches yet. So in this paper, we propose a supplemented authorization policy management framework based on RBAC (Role-Based Access Control) for user access control at home network environment in which the OSGi service platform is operated. The proposed access control framework improves effectiveness, assures privacy and provides convenience at the same time. In conclusion, we provide the base to implement the effective, safe, and convenient the OSGi service platform by proposing the new framework in authorization and user administration part.

关键词： Access control Home automation Authorization Privacy Consumer electronics Authentication computer science Concrete Environmental management Information technology

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THE MULTI-RULE & REAL-TIME TRAINING NEURAL NETWORK MODEL FOR TIME SERIES FORECASTING PROBLEM

THE MULTI-RULE & REAL-TIME TRAINING NEURAL NETWORK MODEL FOR...

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2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： XI-ZHENG ZHANG LI-NING XING The Department of Computer Science Hunan Institute of Engineering Xiangtan 411101 China The Department of Management School of Information System and Management National University of De

In view of the limitation of existing Neural Network model in solving time series forecasting problem, put forward a new Multi-Rule & Real-Time Training Neural Network (MRRTTNN) model. The characteristics of this proposed model including (1) miniaturize the forecasting network, (2)train the network in real-time way, (3) adopt the average of abundant forecasting and (4) add some rules to assistant forecasting. Relative to the traditional Neural Network model,this model focus on dynamic training and dynamic forecasting, increase three rules (rule of dealing with abnormity, rule of retraining and rule of adopting the average) to assistant forecasting. Numerical example suggests the correctness and feasibility of this model. The contradistinctive result of this model and other five models indicates the validity and superiority of this model.

关键词： Time series forecasting neural network real-time training multi-rule

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Cache optimization for an embedded MPEG-4 video decoder

Cache optimization for an embedded MPEG-4 video decoder

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International Conference on Signal Processing Proceedings (ICSP)

作者： Hongxing Guo Tao Sheng Weiping Sun Jingli Zhou Shengsheng Yu Department of Computer Science and Engineering Division of Data Storage System of Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei China

Video decoders are an important component in modern networked multimedia systems. TMS320DM642 is suitable for implementation of embedded video decoder. However, the high data rate, large sizes, and distinctive memory access patterns of MPEG-4 video decoders exert a particular strain on cache. This paper proposes an optimization method to allocate the memory of TMS320DM642. In cache-SRAM-SDRAM structure, the SRAM negotiates the unbalance of the cache and the SDRAM in speed and capacity. Due to its importance, a cache-based memory allocation mode is proposed to make full use of the SRAM. According to this mode, the SRAM is divided into three sections: the data exchanging section, the core code and variables storage section, and the rest of the SRAM which is set as cache for the other codes and data management. The experiment results show the proposed solutions can improve the MPEG-4 decoding speed by almost 25%. This cache optimization method has been integrated into the developed embedded MPEG-4 video decoder. The decoder can perform real time decoding with bitstreams coded under two channels 4CIF or eight channels CIF frame size which is the typical requirement of networked video surveillance applications nowadays

关键词： MPEG 4 Standard Decoding Random access memory Video compression Image coding Motion estimation Capacitive sensors Optimization methods Video surveillance Sun

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Advanced Functions of the Scanning Laser Range Sensor for Environment Recognition in Mobile Robots

Advanced Functions of the Scanning Laser Range Sensor for En...

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International Conference on Multisensor Fusion and Integration for Intelligent systems (MFI)

作者： Hirohiko Kawata Satofumi Kamimura Akihisa Ohya Jun'ich Iijima Shin'ich Yuta The Department of Computer Science University of Tsukuba Tsukuba Japan Department of Intelligent Interaction Technologies Graduate School of System and Information Engineering University of Tsukuba Tsukuba Japan The Mechanical Engineering Research Laboratory Hitachi Ltd. Hitachinaka Japan Department of Computer Science Graduate School of System and Information EngineeringGraduate School of System and Information Engineering University of Tsukuba Tsukuba Japan The Faculty of Information Science Meisei University Hino Japan

We have developed scanning laser range sensor called "SOKUIKI" sensor which is ultra-small scanning laser range sensor adopted for various types of mobile robots as we have already published. As a sensor for environment recognition, we thought the sensor must have not only outputting distance data but also another helpful function for mobile robots. So it was considered that what kind of advanced functions should be provided to SOKUIKI sensor. As a result two most important purposes were acquired. 1. Variation on its distance data and method to get the data. 2. The function for prevention of optical interference between sensors. These rolls were installed to the sensor, and confirmed their effect. This paper describes its result and proposes sensor communication interface protocol (SCIP) which is developed as new command system just for SOKUIKI sensor

关键词： Mobile robots Intelligent sensors Sensor systems Sensor fusion systems engineering and theory Optical sensors Robot sensing systems Frequency Laser fusion Sensor phenomena and characterization

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InfoShield: a security architecture for protecting information usage in memory

InfoShield: a security architecture for protecting informati...

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IEEE Symposium on High-Performance computer Architecture

作者： W. Shi J.B. Fryman G. Gu H.-H.S. Lee Y. Zhang J. Yang School of Electrical and Computer Engineering Georgia Tech College of Computing Georgia Institute of Technology Programming System Lab Corporate Technology Intel Corporation USA Department of Computer Science University of Pittsburgh USA Department of Computer Science and Engineering University of California Riverside USA

Cyber theft is a serious threat to Internet security. It is one of the major security concerns by both network service providers and Internet users. Though sensitive information can be encrypted when stored in non-volatile memory such as hard disks, for many e-commerce and network applications, sensitive information is often stored as plaintext in main memory. Documented and reported exploits facilitate an adversary stealing sensitive information from an application's memory. These exploits include illegitimate memory scan, information theft oriented buffer overflow, invalid pointer manipulation, integer overflow, password stealing Trojans and so forth. Today's computing system and its hardware cannot address these exploits effectively in a coherent way. This paper presents a unified and lightweight solution, called InfoShield that can strengthen application protection against theft of sensitive information such as passwords, encryption keys, and other private data with a minimal performance impact. Unlike prior whole memory encryption and information flow based efforts, InfoShield protects the usage of information. InfoShield ensures that sensitive data are used only as defined by application semantics, preventing misuse of information. Comparing with prior art, InfoShield handles a broader range of information theft scenarios in a unified framework with less overhead. Evaluation using popular network client-server applications shows that InfoShield is sound for practical use and incurs little performance loss because InfoShield only protects absolute, critical sensitive information. Based on the profiling results, only 0.3% of memory accesses and 0.2% of executed codes are affected by InfoShield.

关键词： Information security Protection Cryptography computer security IP networks Web and internet services Nonvolatile memory Hard disks Buffer overflow Hardware

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Integrated information processing and communications: Complexity analysis

Integrated information processing and communications: Comple...

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IASTED International Conference on COMMUNICATION systemS AND APPLICATIONS Part of the Sixth IASTED International Multi-Conference on WIRELESS AND OPTICAL COMMUNICATIONS

作者： Huyu, Qu Le, Yi Wang Yaprak, Ece Hong, Wang Yanlong, Zhao Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 United States Division of Engineering Technology Wayne State University Detroit MI 48202 United States Department of Anesthesiology Wayne State University Detroit MI 48202 United States Key Laboratory of System and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences China

Accuracy of information transmission when a signal must be transmitted through a communication channel is of essential importance in design of communication systems. When system resources are limited, such as transmission bandwidths assigned to a wireless communication channel, appropriate utility of available resources becomes imperative. This paper investigates fundamental relationships between accuracy of information exchange and communication resources, on a platform of wireless communication channels that involve typical system blocks of data compression, quantization, and stochastic wireless channels. The main complexity relationships developed in this paper provide rigorous trade-off between resource consumptions and information processing errors of each block. When these relationships are integrated, an optimization procedure emerges that allows optimal allocation of resources to each system block, such as compression ratio, quantization levels, and transmission speed, to maximize overall information accuracy. Consequently, the overall errors of the transmitted signal will be minimized at the receiver end.

关键词： Data processing

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