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First International Multi- Symposiums on computer and Computational Sciences, IMSCCS'06

作者： Qin, Yong Zhao, Chenggui School of Computer Science and Engineering South China University of Technology Guangzhou 510640 China Information and Network Center Maoming University Maoming Guangdong 525000 China

ISBN: (纸本)0769525814

In this paper, the authors propose a scheme of multilevel parallel scheduling and traffic balancing, based on multiple constraints of packet switch network. By linear mapping tiny subsets of route space to network links, we obtain the single solution and quantization formulation of split scheduling algorithm according to non-cooperative route scheduling strategy at single node. Furthermore, we also present the concept of link factor to descript the carrying capacity of links more accurately. The cyclic biding algorithm was designed to optimize the time-weighed property, which passes down the single solution to parallel controlling nodes and parallelizes the computation of IP header reorganization. It also was provided that the approximate method of computing the extended granularity of the controlling nodes. © 2006 IEEE.

关键词： Telecommunication networks

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NEMO 3-D and nanoHUB: Bridging research and education

NEMO 3-D and nanoHUB: Bridging research and education

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Klimeck, Gerhard McLennan, Michael Mannino, Matteo Korkusinski, Marek Heitzinger, Clemens Kennell, Rick Clark, Steven Network for Computational Nanotechnology School of Electrical and Computer Engineering Information Technology at Purdue Rosen Center for Advanced Computing Purdue University West Lafayette IN 47907 United States

ISBN: (纸本)1424400783

The 3-D Nanoelectronic Modeling Tool (NEMO 3-D) is an electronic structure simulation code for the analysis of quantum dots, quantum wells, nanowires, and impurities. NEMO 3-D uses the Valence Force Field (VFF) method for strain and the empirical tight binding (ETB) for the electronic structure calculations. Various ETB models are available, ranging from single s orbitais (single band effective mass), over sp3s* to sp3d 5s* models, with and without explicit representation of spin. The code is highly optimized for operation on cluster computing systems. Simulations of systems of 64 million atoms (strain) and 21 million atoms have been demonstrated. This implies that every atom is accounted for in simulation volumes of (110nm)3 and (77nm)3, respectively. Such simulations require parallel execution on 64 itanium2 CPUs for around 12 hours. A simple effective mass calculation of an isolated quantum dot, in contrast, requires about 20 seconds on a single CPU. NEMO 3-D therefore offers the opportunity to engage both educators and advanced researchers, utilizing a single code. *** is the community web site hosted by the network for Computational Nanotechnology (NCN) dedicated to bridge education, research, and development for the whole nanoscience and nanotechnology community. This paper reviews the mission of the NCN exemplified by the development and deployment of the NEMO 3-D tool. © 2006 IEEE.

关键词： Nanoelectronics

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Non-saturated throughput analysis of IEEE 802.11 ad hoc networks

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 2006年第5期E89D卷 1676-1678页

作者： Xu, Changchun Yang, Zongkai Department of Electronics and Information Huazhong University of Science and Technology China Computer Network Center Naval University of Engineering China

This letter presents a simple but accurate analytical model to evaluate the throughput of IEEE 802.11 distributed coordination function in non-saturated conditions. The influence of offered load on the throughput of both basic and RTS/CTS access mechanisms are analyzed and compared. It's shown that basic access scheme can achieve the same maximal throughput as that of RTS/CTS mechanism in non-saturated conditions while the latter is robust to the number of contending stations compared to basic mechanism. The analytical results are validated by extensive simulations.

关键词： IEEE 802.11 ad hoc networks non-saturated throughput Markov chain

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An efficient SVM-based method to detect malicious attacks for Web servers

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APWeb 2006 International Workshops: XRA, IWSN, MEGA, and ICSE

作者： Yang, Wu Yun, Xiao-Chun Li, Jian-Hua Information Security Research Center Harbin Engineering University Harbin 150001 China Computer Network and Information Security Technique Research Center Harbin Institute of Technology Harbin 150001 China College of Information Security Engineering Shanghai Jiao Tong University China

ISBN: (纸本)3540311580

In recent years, with the rapid development of network technique and network bandwidth, the network attacking events for web servers such as DOS/PROBE are becoming more and more frequent. In order to detect these types of intrusions in the new network environment more efficiently, this paper applies new machine learning methods to intrusion detection and proposes an efficient algorithm based on vector quantization and support vector machine for intrusion detection (VQ-SVM). The algorithm firstly reduces the network auditing dataset by using VQ techniques, produces a codebook as the training example set, and then adopts fast training algorithm for SVM to build intrusion detection model on the codebook. The experiment results indicate that the combined algorithm of VQ-SVM can greatly improve the learning and detecting efficiency of the traditional SVM-based intrusion detection model. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Learning systems

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An Event-Driven Sports Video Adaptation for the MPEG-21 DIA Framework

An Event-Driven Sports Video Adaptation for the MPEG-21 DIA ...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Min Xu Jiaming Li Yiqun Hu Liang-tien Chia Bu-sung Lee Deepu Rajan Jianfei Cai Center for Multimedia and Network Technology School of Computer Engineering Nanyang Technological University Singapore

We present an event-driven video adaptation system in this paper. Events are detected by audio/video analysis and annotated by the description schemes (DSs) provided by MPEG-7 multimedia description schemes (MDSs). And then, adaptation take account of users' preference of events and network characteristic to adapt video by event selection and frame dropping as following three steps: 1) the event information is parsed from MPEG-7 annotation XML file together with bitstream to generate generic bitstream syntax description (gBSD), 2) users' preference, network characteristic and adaptation QoS (AQoS) are considered for making adaptation decision, 3) adaptation engine automatically parses adaptation decisions and gBSD to achieve adaptation. Different from most existing adaptation work, the system adapts video by interesting events according to users' preference. To achieve a generic adaptation solution, the system is developed following MPEG-7 and MPEG-21 standards. gBSD based adaptation avoids complex video computation. 30 students from various departments test the system with satisfaction. Although, the system is tested on basketball video adaptation so far, it is easy to extend to other video domains

关键词： MPEG 7 Standard Event detection Multimedia systems XML Decision support systems Engines System testing Transcoding Computational efficiency computer networks

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An improved distortion model for rate control of DCT-based video coding

An improved distortion model for rate control of DCT-based v...

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International Conference on Multimedia Modeling (MMM)

作者： Jun Xie Liang-Tien Chia Bu-Sung Lee Center for Multimedia & Network Technology School of Computer Engineering Nanyang Technological University Singapore

This paper presents a rate control algorithm for the dominant discrete cosine transform (DCT)-based video coding. It is developed based on a more accurate rate-distortion (R-D) model, specifically, a new distortion-quantization (D-Q) model. Different from previous work that employs a uniform D-Q model or an empirical distortion model, our work proposes an accurate distortion model, which can quantitatively describe the relationship of distortion with respect to video source information and the selected quantization resolution. Based on understanding the distribution of source frequency coefficients and the quantization theory, our distortion model is proposed. This distortion model is combined with the classical R-D theory to generate a new rate model. Finally, the proposed model is implemented on an MPEG-4 encoder to perform rate control for a low-delay visual communication system. We also compare the proposed rate control with the VM18 rate control and it has been shown to be more efficient

关键词： Rate distortion theory Video coding Discrete cosine transforms Quantization Frequency Communication system control Quadratic programming Rate-distortion Video compression computer networks

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An Improved Distortion Model for rate control of DCT-based Video Coding

An Improved Distortion Model for rate control of DCT-based V...

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The 12th International Multimedia Modelling Conference(MMM2006)

作者： Liang-Tien Chia Bu-Sung Lee Center for Multimedia & Network Technology School of Computer EngineeringNanyang Technological UniversitySingapore 639798

This paper presents a rate control algorithm for the dominant discrete cosine transform (DCT)-based video *** is developed based on a more accurate rate-distortion (RD) model,specifically,a new distortion-quantization (D-Q) *** from previous work that employs a uniform D-Q model or an empirical distortion model,our work proposes an accurate distortion model,which can quantitatively describe the relationship of distortion with respect to video source information and the selected quantization *** on understanding the distribution of source frequency coefficients and the quantization theory,our distortion model is *** distortion model is combined with the classical R-D theory to generate a new rate ***,the proposed model is implemented on an MPEG-4 encoder to perform rate control for a low-delay visual communication *** also compare the proposed rate control with the VM18 rate control and it has been shown to be more efficient.

关键词： An Improved Distortion Model for rate control of DCT-based Video Coding DCT Model

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Image Model based on Salient Regions and its Applications

Image Model based on Salient Regions and its Applications

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The 12th International Multimedia Modelling Conference(MMM2006)

作者： Liang-Tien Chia Center for Multimedia and Network Technology School of Computer Engineering Nanyang Technological University Singapore 639798

Detection,representation,and training are the three main issues that need to be resolved in an object recognition or classification *** possible method is using collection of regions to represent object categories,where each region has a distinctive *** this paper we present a region-based image model which will learn and classify objects by training the image model with variant of the objects within the same *** object category is represented by a constellation of representative *** regions are detected by salient region detector over suitable *** standard disjunction rules is applied to construct the image *** the learning procedure,the distance between any two regions is calculated and accumulated as a measure which is inversely proportional to the probability of a *** regions with large distances will be removed from the image model *** a small set of regions will be kept as the image *** image model can be used to retrieve similar images or for object *** results show the method is easy to calculate and efficient.

关键词： image Image Model based on Salient Regions and its Applications Model

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Study of a traffic splitting scheduling algorithm in multi-solution space for non-synergic nodes

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Jisuanji Gongcheng/computer engineering 2006年第5期32卷 86-88+118页

作者： Qin, Yong Department of Computer Science and Engineering South China University of Technology Guangzhou 510641 China Information and Network Center Maoming College Maoming 525000 China

Based on the multi-restrict traffic load balancing model, a multilevel parallelizable scheduling system is given to optimize the traffic engineering state in autonomous system which has multi outgoing links. A quantitative analysis formula of routing space splitting scheduling algorithm is given, and the approach of parallelization computing for IP header recomposing is realized. The actual experiments show that the network throughput increases, the bandwidth utilization ratio is improved and the network has rapid time response property in the whole routing space.

关键词： Granularity Non-synergic Solution space Splitting scheduling algorithm for multilevel parallelizable system

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Towards a new generalization of optimal load balancing scheme to heterogeneous networks

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Journal of Information and Computational Science 2006年第4期3卷 1049-1054页

作者： Zhao, Chenggui Xiao, Wenjun Qin, Yong School of Computer Science and Engineering South China University of Technology Guangzhou 510640 China Center of Computer Network and Information Maoming University Maoming 525000 China

The Optimal Scheme (OPT) in [9] has been generalized by Elsässer in [5] to tackle load balancing problem on heterogeneous networks by including a generalized Laplacian in iterative polynomial. Unfortunately, this generalized scheme is often inconvenient because all the distinct eigenvalues of a generalized Laplacian of network must be computed. To some familiar networks, finding spectrum of a generalized Laplacian usually has a higher complexity than finding one of ordinary Laplacian for the latter often has fewer eigenvalues, like hypercube network. So, those schemes whose iterative polynomials include eigenvalues of generalized Laplacian are difficult to implement in practical applications. This paper aims to overcome this difficulty and proposes a new generalization of OPT scheme, called GOPT, for load balancing on heterogeneous networks. This new GOPT scheme leads to almost the same complexity as OPT ([9]) on lomogeneous networks, which brings a noticeable improvement on previous generalization ([5]) of OPT scheme.

关键词： computer networks

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