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IEEE Symposium on Nuclear science (NSS/MIC)

作者： Sungsoo Ha Zhiyuan Zhang Klaus Mueller Samuel Matej Center of Visual Computing Computer Science Department Stony Brook University NY USA Department of Radiology University of Pennsylvania Philadelphia PA USA

The DIRECT approach for 3-D Time-of-Flight (TOF) PET reconstruction performs all iterative predictor-corrector operations directly in image space. A computational bottleneck here is the convolution with the long TOF (resolution) kernels. Accelerating this convolution operation using GPUs is very important especially for spatially variant resolution kernels, which cannot be efficiently implemented in the Fourier domain. The main challenge here is the memory cache performance at non-axis aligned directions. We devised a scheme that first re-samples the image into an axis-aligned orientation offering good memory coherence for the convolution operations. In order to maintain good accuracy, we carefully design the resampling and new convolution kernels to combine into the original TOF kernel. This paper demonstrates the validity, accuracy, and high speed-performance of our scheme for a comprehensive set of orientation angles. Future work will apply these cascaded kernels within a GPU-accelerated version of DIRECT.

关键词： Kernel Image reconstruction Graphics processing unit Acceleration Strontium Positron emission tomography Filtering theory

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Bayesian cognitive trust model based self-clustering algorithm for MANETs

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science China(Information sciences) 2010年第3期53卷 494-505页

作者： WANG Wei1,2,3 & ZENG GuoSun1,2,31department of computer science & Technology, Tongji University, Shanghai 200092, China 2Tongji Branch, National Engineering & Technology center of High Performance computer, Shanghai 200092, China 3Key Loboratory of Embedded System and Service computing, Ministry of Education, Shanghai 200092, China 1. Department of Computer Science & Technology Tongji University Shanghai 200092 China2. Tongji Branch National Engineering & Technology Center of High Performance Computer Shanghai 200092 China3. Key Loboratory of Embedded System and Service Computing Ministry of Education Shanghai 200092 China

With the introduction of mobile Ad hoc networks (MANETs), nodes are able to participate in a dynamic network which lacks an underlying infrastructure. Before two nodes agree to interact, they must trust that each will satisfy the security and privacy requirements of the other. In this paper, using the cognition inspired method from the brain informatics (BI), we present a novel approach to improving the search efficiency and scalability of MANETs by clustering nodes based on cognitive trust mechanism. The trust relationship is formed by evaluating the level of trust using Bayesian statistic analysis, and clusters can be formed and maintained autonomously by nodes with only partial knowledge. Simulation experiments show that each node can form and join proper clusters, which improve the interaction performance of the entire network. The essence of the underlying reason is analyzed through the theory of complex networks, revealing great scalability of this method.

关键词： trust model MANET self-clustering Bayesian method cognitive mobile

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Steganography in Chinese text

Steganography in Chinese text

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2010 International Conference on computer Application and System Modeling, ICCASM 2010

作者： Sun, Xinmei Meng, Peng Ye, Yun Hang, Liusheng HuaiBei Vocational and Technical College Huaibei Anhui 235000 China Department of Computer Science and Technology National High Performance Computing Center at Hefei Hefei 230027 China

ISBN: (纸本)9781424472369

Steganography is an important research direction of information security, which mainly research how to embed secret information into carriers, in order to achieve the objectives of secure communication. In this paper, a novel Chinese text steganography based on substitution of different forms Chinese characters is proposed. We propose two embedding methods named SSM and HESM. SSM simply substitute some characters to embed the hidden message, which has high embedding rate. In HESM, we first split the hidden message into segments with the same size, and then embed the hidden message segment by segment into the carrier text. The segment length can be adjusted according to the application requirements. The highest embedding rate of the our steganographic algorithm is about 2%. In addition, our algorithm don't change the content of the carrier text, and it can resist traditional attacking methods such as re-layout, and so on. © 2010 IEEE.

关键词： Steganography

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Two examples of GPGPU acceleration of memory-intensive algorithms

Two examples of GPGPU acceleration of memory-intensive algor...

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8th Eurographics Italian Chapter Conference 2010

作者： Marras, Stefano Mura, Claudio Gobbetti, Enrico Scateni, Riccardo Scopigno, Roberto University of Cagliari Dept. of Mathematics and Computer Science Italy Sardegna Ricerche DistrICT Lab. Italy CRS4 - Center for Advanced Studies Research and Development Sardinia Italy ISTI-CNR Visual Computing Lab. Italy

ISBN: (纸本)9783905673807

The advent of GPGPU technologies has allowed for sensible speed-ups in many high-dimension, memory-intensive computational problems. In this paper we demonstrate the effectiveness of such techniques by describing two applications of GPGPU computing to two different subfields of computer graphics, namely computer vision and mesh processing. In the first case, CUDA technology is employed to accelerate the computation of approximation of motion between two images, known also as optical flow. As for mesh processing, we exploit the massively-parallel architecture of CUDA devices to accelerate the face clustering procedure that is employed in many recent mesh segmentation algorithms. In both cases, the results obtained so far are presented and thoroughly discussed, along with the expected future development of the work. © The Eurographics Association 2010.

关键词： Parallel architectures

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Supervised reinforcement learning in discrete environment domains

Supervised reinforcement learning in discrete environment do...

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2010 2nd World Congress on Nature and Biologically Inspired computing, NaBIC 2010

作者： Jensen, Boris Ortiz-Arroyo, Daniel Cruz-Cortés, Nareli Rodríguez-Henríquez, Francisco Computational Intelligence and Security Lab. Department of Electronic Systems Aalborg University Denmark Center for Computing Research National Politechnique Institute Mexico Computer Science Department CINVESTAV-IPN Mexico

ISBN: (纸本)9781424473762

This paper describes a supervised reinforcement learning-based model for discrete environment domains. The model was tested within the domain of backgammon game. Our results show that a supervised actor-critic based learning model is capable of improving the initial performance and then eventually reach similar performance levels as those obtained by TD-Gammon, an artificial neural network player (ANN) trained by temporal differences. © 2010 IEEE.

关键词： Reinforcement learning

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Relation of PPAtMP and scalar product protocol and their applications

Relation of PPAtMP and scalar product protocol and their app...

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15th IEEE Symposium on computers and Communications, ISCC 2010

作者： Zhu, Youwen Huang, Liusheng Yang, Wei National High Performance Computing Center at Hefei Department of Computer Science and Technology University of Science and Technology of China Hefei 230026 China Suzhou Institute for Advanced Study University of Science and Technology of China Suzhou 215123 China

ISBN: (纸本)9781424477555

Scalar product protocol and privacy preserving add to multiply protocol (PPAtMP) are two significant basic secure multiparty computation protocols. In this paper, we claim that the two protocols are equivalent to each other and we can achieve one based on the other with the same communication and computation complexity. Then, we propose Secure Two-party Mean Protocol, Secure Shared x ln x Protocol and Secure Shared Generic Polynomial Protocol based on scalar product protocol and PPAtMP. Additionally, we analyze the correctness, security, communication overheads and computation complexity of each protocol proposed in this paper. © 2010 IEEE.

关键词： Data privacy

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Towards garbage collection mechanism for RTSJ-oriented embedded Java Processor

Towards garbage collection mechanism for RTSJ-oriented embed...

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10th IEEE International Conference on computer and Information Technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable computing and Communications, ScalCom-2010

作者： Hu, Guang Chai, Zhilei Zhao, Wenke Tu, Shiliang Department of Computer Science Shanghai International Studies University Shanghai China Department of Computer Science and Engineering Fudan University Shanghai China Siemens Corporate Technology Beijing China Center of Intelligent and High Performance Computing School of Information Technology Jiangnan University Wuxi China

ISBN: (纸本)9780769541082

Currently, Java has been gradually applied in embedded real-time area with the improvement by the Real-Time Specification for Java (RTSJ). Accordingly, a hardware Java execution engine for embedded real-time applications, JPOR-32 (32-bit Java Processor Optimized for RTSJ), is designed. Taking JPOR-32 for an example, this paper presents the garbage collection mechanism for RTSJ-oriented embedded processor in detail. JPOR-32 provides effective architectural support for garbage collection. And the object reference format of JPOR-32 provides supports for objects tracing and heap scanning. The support for write barrier of real-time concurrent GC is also performed. Moreover, JPOR- 32 provides optimized instruction level support for garbage collection. In addition, different garbage collection algorithms are compared on the base of the resource-constrained feature and the real-time requirement of the processor, and the hybrid garbage collectors are suggested. © 2010 IEEE.

关键词： Refuse collection

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Design of virtual honeynet collaboration system in existing security research networks

Design of virtual honeynet collaboration system in existing ...

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IEEE International Symposium on Communications and Information Technology

作者： Chang, Jason Chih-Hung Tsai, Yi-Lang CyberSecurity Lab. National Center for High-performance Computing Hsinchu Taiwan SENSE Lab. Department of Computer Science National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781424470105

This paper proposes the virtual honeynet collaboration system (VHS) to improve the designs and concepts of the honeynet architectures. Using virtualization technologies (VTs) as a development platform, the proposed approach combines honeynet technologies to develop a new virtual honeynet architecture that implements VHS. This study also proposes the honeypot redirect-outbound (HRO) algorithm and the honeypot redirect-inbound (HRI) algorithm to solve the problems of honeypot module (HM) parallelism operation and bypass security module (SM) issues. Using a modular design concept, each module can be customized according to different needs, making the VHS superior to the conventional, modified, and hybrid honeynet design. ©2010 IEEE.

关键词： Network architecture

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Impact of sub-optimal checkpoint intervals on application efficiency in computational clusters 10

Impact of sub-optimal checkpoint intervals on application ef...

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Proceedings of the 19th ACM International Symposium on High Performance Distributed computing

作者： Jones, William M. Daly, John T. DeBardeleben, Nathan Department of Computer Science Coastal Carolina University Conway SC United States Center for Exceptional Computing Department of Defense Fort Meade MD United States High Performance Computing Los Alamos National Laboratory Los Alamos NM United States

ISBN: (纸本)9781605589428

As computational clusters rapidly grow in both size and complexity, system reliability and, in particular, application resilience have become increasingly important factors to consider in maintaining efficiency and providing improved computational performance over predecessor systems. One commonly used mechanism for providing application fault tolerance in parallel systems is the use of checkpointing. By making use of a multi-cluster simulator, we study the impact of sub-optimal checkpoint intervals on overall application efficiency. By using a model of a 1926 node cluster and workload statistics from Los Alamos National Laboratory to parameterize the simulator, we find that dramatically over-estimating the AMTTI has a fairly minor impact on application efficiency while potentially having a much more severe impact on user-centric performance metrics such a queueing delay. We compare and contrast these results with the trends predicted by an analytical model. Copyright 2010 ACM.

关键词： Fault tolerance

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A network management system based on DPI

A network management system based on DPI

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International Conference on Network-Based Information Systems

作者： Yang, Chu-Sing Liao, Ming-Yi Luo, Mon-Yen Wang, Shin-Min Yeh, C. Eugene Department of Electrical Engineering Institute of Computer and Communication Engineering National Cheng Kung University Taiwan Department of Computer Science and Information Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan National Center for High-Performance Computing Taiwan

ISBN: (纸本)9780769541679

More and more network applications have appeared in recent years. Government, university, industry and individual Internet users and network services need more bandwidth and various network applications. Many new network protocols are proposed so that it is now becoming harder to manage the network. In the conditional network, every network protocol uses the fixed port, the so-called well-known port number. In the past, it was easy to classify and manage the network traffic because we could identify the network service by the port number. However, new types of network applications do not use fixed port number. The method of traffic classification with fixed port number is inadequate. In recent years, the DPI (Deep Packet Inspection) is used to classify the traffic. This study deploys a NMS (network management system) based on DPI and SNMP. The NMS controls the network devices and services according to the traffic classification of DPIS (DPI server). The platform of DPIS is implemented on the Netfilter framework in Linux kernel. © 2010 IEEE.

关键词： Network management

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