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IEEE International Symposium on Performance Analysis of Systems and software

作者： Chao Li Yi Yang Hongwen Dai Shengen Yan Frank Mueller Huiyang Zhou Department of Electrical and Computer Engineering North Carolina State University Department of Computing Systems Architecture NEC Laboratories America Institute of Software North Carolina State University Department of Computer Science North Carolina State University

On-chip caches are commonly used in computer systems to hide long off-chip memory access latencies. To manage on-chip caches, either software-managed or hardware-managed schemes can be employed. State-of-art accelerators, such as the NVIDIA Fermi or Kepler GPUs and Intel's forthcoming MIC “Knights Landing” (KNL), support both software-managed caches, aka. shared memory (GPUs) or near memory (KNL), and hardware-managed L1 data caches (D-caches). Furthermore, shared memory and the L1 D-cache on a GPU utilize the same physical storage and their capacity can be configured at runtime (same for KNL). In this paper, we present an in-depth study to reveal interesting and sometimes unexpected tradeoffs between shared memory and the hardware-managed L1 D- caches in GPU architecture. In our study, the kernels utilizing the L1 D-caches are generated from those leveraging shared memory to ensure that the same optimizations such as tiling are applied equally in both versions. Our detailed analyses reveal that rather than cache hit rates, the following tradeoffs often have more profound performance impacts. On one hand, the kernels utilizing the L1 caches may support higher degrees of thread-level parallelism, offer more opportunities for data to be allocated in registers, and sometimes result in lower dynamic instruction counts. On the other hand, the applications utilizing shared memory enable more coalesced accesses and tend to achieve higher degrees of memory-level parallelism. Overall, our results show that most benchmarks perform significantly better with shared memory than the L1 D-caches due to the high impact of memory-level parallelism and memory coalescing.

关键词： Graphics processing units Tiles Kernel Prefetching Computer architecture Parallel processing

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Cloudsme: Developing a cloud computing-based platform for simulation in manufacturing and engineering

Cloudsme: Developing a cloud computing-based platform for si...

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2014 Operational Research Society Simulation Workshop, SW 2014

作者： Taylor, Simon J. E. Kiss, Tamas Kacsuk, Peter Terstyanszky, Gabor Nicola, Fantini Department of Information Systems and Computing Brunel University Uxbridge MiddlesexUB8 3PH United Kingdom Centre for Parallel Computing Department of Business Information Systems University of Westminster 115 New Cavendish St LondonW1W 6UW United Kingdom MTA SZTAKI Victor Hugo u. 18-22 Budapest1132 Hungary Department of Computer Science and Software Engineering Faculty of Science and Technology University of Westminster LondonW1W 6UW United Kingdom Huobstrasse 10 Pfäffikon8808 Switzerland

There is a demand from simulation users for speed, the ability to obtain quickly results from simulation runs. Cloud computing offers the potential for scalable, on-demand access to resources that can be used to speed up simulation. However, developing cloud computing solutions for industry is difficult without appropriate expertise. This paper introduces the CloudSME project that is dedicated to developing cloud computing solutions for simulation in industry and presents an overview of the CloudSME Simulation Platform that is being used to support an initial set of Cloud-based versions of Simul8's discrete-event simulation environment, Ascomp's TransAT computational fluid dynamics application, Ingecon's 3D Scan Insole Designer tool and 2MORO's Bfly software for aircraft maintenance logistics. The paper presents an overview of cloud computing, the CloudSME project, the architecture of the CloudSME Simulation Platform and its two key elements: gUse and CloudBroker.

关键词： Discrete event simulation

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Visual loop closure detection by matching binary visual features using locality sensitive hashing

Visual loop closure detection by matching binary visual feat...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Junjun Wu Hong Zhang Yisheng Guan Guangdong Food and Drug School of Software Guangzhou China Department of Computing Science University of Alberta Edmonton AB Canada School of Mechanical and Electrical Engineering Guangdong University of Technology Guangzhou China

In this paper, we present a novel approach for visual loop-closure detection in autonomous robot navigation. Our method uses locality sensitive hashing (LSH) as the basic technique for matching the binary visual features in the current view of a robot with the visual features in the robot appearance map. We show that this approach is highly efficient in comparison with using non-binary visual features such as SIFT and that it is more accurate than the popular bag-of-words (BoW) approach for generating loop closure candidates. Our experiment was conducted with an indoor dataset.

关键词： Visualization Feature extraction Simultaneous localization and mapping Vocabulary Equations Mathematical model

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Virtual-machine metadata optimization for I/O traffic reduction in mobile virtualization

Virtual-machine metadata optimization for I/O traffic reduct...

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IEEE Non-Volatile Memory Systems and Applications Symposium (NVMSA)

作者： Renhai Chen Yi Wang Jingtong Hu Duo Liu Zili Shao Yong Guan Department of Computing The Hong Kong Polytechnic University College of Computer Science and Software Engineering Shenzhen University School of Electrical and Computer Engineering Oklahoma State University College of Computer Science Chongqing University College of Computer and Information Management Capital Normal University

Mobile virtualization introduces extra layers in software stacks, which leads to performance degradation. Especially, each I/O operation has to pass through several software layers to reach the NAND-flash-based storage systems. Among all the I/O operations, a large percentage is updating metadata. Frequent updating metadata not only degrades overall I/O performance but also severely reduces flash memory lifetime. In this paper, we propose a novel I/O optimization technique to identify the metadata of a guest file system which are stored in a VM image file and frequently updated. Then these metadata are stored in a small additional non-volatile memory which is faster and more endurable to greatly improve flash memory's performance and lifetime. The proposed scheme is evaluated on a real hardware embedded platform. The experimental results show that the proposed techniques can effectively improve the I/O performance in mobile devices with virtualization.

关键词： Ash Educational institutions Nonvolatile memory Virtualization Performance evaluation Phase change materials Mobile communication

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Resource management for cognitive cloud gaming

Resource management for cognitive cloud gaming

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IEEE International Conference on Communications (ICC)

作者： Wei Cai Min Chen Conghui Zhou Victor C. M. Leung Henry C. B. Chan Department of Electrical and Computer Engineering The University of British Columbia Canada Huazhong University of Science and Technology Wuhan Hubei CN We Software Limited Hong Kong Department of Computing The Hong Kong Polytechnic University Hong Kong

In contrary to conventional gaming-on-demand solution, cognitive cloud gaming platform facilitates gaming component migration from the cloud server to the players' terminal, a novel flexible solution to provide Gaming as a Service. In this work, we model the component-based game and investigate the capacity of intelligent resource management for different optimization targets, including cloud resource minimization and throughput-oriented optimization. Experimental results show that, with the cognitive resource management, cloud system is adaptive to various service requirements, such as increasing the quantity of supported devices and reducing the network throughput of user terminals, while satisfying players' quality of experience.

关键词： Games Resource management Optimization Quality of service Gallium arsenide Throughput Mobile communication

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On RFID authentication protocols with wide-strong privacy

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Cryptology and Information Security Series 2013年 11卷 3-16页

作者： Li, Nan Mu, Yi Susilo, Willy Guo, Fuchun Varadharajan, Vijay Centre for Computer and Information Security Research School of Computer Science and Software Engineering University of Wollongong Wollongong Australia Department of Computing Faculty of Science Macquarie University Sydney Australia

ISBN: (纸本)9781614993278

Radio frequency identification (RFID) tag privacy is an important issue to RFID security. To date, there have been several attempts to achieve the wide-strong privacy by using zero-knowledge protocols. In this paper, we launch an attack on the recent zero-knowledge based identification protocol for RFID, which was claimed to capture wide-strong privacy, and show that this protocol is flawed. Subsequently, we propose two zero-knowledge based tag authentication protocols and prove that they offer wide-strong privacy. © 2013 The authors and IOS Press. All rights reserved.

关键词： Radio frequency identification (RFID)

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Almost Optimal Channel Access in Multi-Hop Networks with Unknown Channel Variables

Almost Optimal Channel Access in Multi-Hop Networks with Unk...

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International Conference on Distributed computing Systems

作者： Yaqin Zhou Qiuyuan Huang Fan Li Xiang-Yang Li Min Liu Zhongcheng Li Zhiyuan Yin Institute of Computing Technology Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering University of Florida Gainesville FL USA School of Computer Science Beijing Institute of Technology School of Software and TNLIST Tsinghua University China

We consider the problem of online dynamic channel accessing in multi-hop cognitive radio networks. Previous works on online dynamic channel accessing mainly focus on single-hop networks that assume complete conflicts among all secondary users. In the multi-hop multi-channel network settings studied here, there is more general competition among different communication pairs. A simple application of models for single-hop case to multi-hop case with N nodes and M channels leads to exponential time/space complexity O (M N ), and poor theoretical guarantee on throughput performance. We thus novelly formulate the problem as a linearly combinatorial multi-armed bandits (MAB) problem that involves a maximum weighted independent set (MWIS) problem with unknown weights. To efficiently address the problem, we propose a distributed channel access algorithm that can achieve 1/ρ of the optimum averaged throughput where each node has communication complexity O (r 2 +D) and space complexity O (m) in the learning process, and time complexity O (D m ρr ) in strategy decision process for an arbitrary wireless network. Here ρ = 1 + ε is the approximation ratio to MWIS for a local r-hop network with m

关键词： Throughput Robustness Approximation methods Spread spectrum communication Complexity theory Approximation algorithms Interference

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Resolving vulnerability identification errors using security requirements on business process models

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Information Management and Computer Security 2013年第3期21卷 202-223页

作者： Taubenberger, Stefan Jürjens, Jan Yu, Yijun Nuseibeh, Bashar Computing Department Open University Milton Keynes United Kingdom Department of Computer Science Technical University Dortmund Dortmund Germany Fraunhofer Institute for Software Systems Engineering ISST Dortmund Germany Lero the Irish Software Engineering Research Centre Computing Department University of Limerick Limerick Ireland Open University Milton Keynes United Kingdom

Purpose - In any information security risk assessment, vulnerabilities are usually identified by information-gathering techniques. However, vulnerability identification errors - wrongly identified or unidentified vulnerabilities - can occur as uncertain data are used. Furthermore, businesses' security needs are not considered sufficiently. Hence, security functions may not protect business assets sufficiently and cost-effectively. This paper aims to resolve vulnerability errors by analysing the security requirements of information assets in business process models. Design/methodology/approach - Business process models have been selected for use, because there is a close relationship between business process objectives and risks. Security functions are evaluated in terms of the information flow of business processes regarding their security requirements. The claim that vulnerability errors can be resolved was validated by comparing the results of a current risk assessment approach with the proposed approach. The comparison is conducted both at three entities of an insurance company, as well as through a controlled experiment within a survey among security professionals. Findings - Vulnerability identification errors can be resolved by explicitly evaluating security requirements in the course of business;this is not considered in current assessment methods. Originality/value - It is shown that vulnerability identification errors occur in practice. With the explicit evaluation of security requirements, identification errors can be resolved. Risk assessment methods should consider the explicit evaluation of security requirements. Copyright © 2013 Emerald Group Publishing Limited. All rights reserved.

关键词： Risk assessment

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DIV： Dynamic Integrity Validation Framework for Detecting Compromises on Virtual Machine Based Cloud Services in Real Time

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China Communications 2014年第8期11卷 15-27页

作者： WANG Chunlu LIU Chuanyi LIU Bin DONG Yingfei School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 P. R. China School of Software Engineering Beijing University of Posts and Telecommunications Beijing 100876 P. R. China Key Laboratory of Trustworthy Distributed Computing and Service (BUPT) Ministry of Education Beijing 100876 P. R. China Department of Electrical Engineering University of Hawaii Honolulu Hawaii U.S.

with the increasing popularity of cloud services,attacks on the cloud infrastructure also increase ***,how to monitor the integrity of cloud execution environments is still a difficult *** this paper,a real-time dynamic integrity validation(DIV) framework is proposed to monitor the integrity of virtual machine based execution environments in the *** can detect the integrity of the whole architecture stack from the cloud servers up to the VM OS by extending the current trusted chain into virtual machine's architecture *** introduces a trusted third party(TTP) to collect the integrity information and detect remotely the integrity violations on VMs periodically to avoid the heavy involvement of cloud tenants and unnecessary information leakage of the cloud *** evaluate the effectiveness and efficiency of DIV framework,a prototype on KVM/QEMU is implemented,and extensive analysis and experimental evaluation are *** results show that the DIV can efficiently validate the integrity of files and loaded programs in real-time,with minor performance overhead.

关键词： cloud security remote attestation trusted computing cloud trustworthiness

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A secure elliptic curve based RFID ownership transfer scheme with controlled delegation

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Cryptology and Information Security Series 2013年 11卷 31-43页

作者： Cheng, Shu Varadharajan, Vijay Mu, Yi Susilo, Willy Department of Computing Faculty of Scicence Macquarie University Sydney Australia Centre for Computer and Information Security Research School of Computer Science and Software Engineering University of Wollongong Wollongong Australia

ISBN: (纸本)9781614993278

In practical applications, the owner of an RFID-tagged item canchange. In this paper, we propose a new RFID ownership transfer protocol using elliptic-curve cryptography. The paper first considers security and privacy requirements in the ownership transfer process. Then the paper provides a detailed description of our ownership transfer scheme outlining various protocol phases. Key features of the proposed scheme are that it allows controlled delegation and authorisation recovery, and the ownership transfer is achieved without a trusted third party. We describe a security analysis of the proposed scheme and demonstrate that it meets the desired security and privacy requirements. We also illustrate the performance results and show that our scheme is feasible for lightweight RFID tags. © 2013 The authors and IOS Press. All rights reserved.

关键词： Radio frequency identification (RFID)

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