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IEEE International Conference on Image Processing

作者： Qiuwen Zhang Ping An Yan Zhang Liquan Shen Zhaoyang Zhang School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Displays and System Application Ministry of Education China Department of Computer Science and Technology Anhui University of Finance and Economics China

Inaccuracy depth estimation may influence on depth coding and virtual view rendering in the free-viewpoint television (FTV) system, an improved depth map estimation is proposed to solve the problem for coding and view synthesis. Firstly, check the consistency of initial depth, and the influence of initial miss-matches is minimized by introduction of an additional adaptive matching error selection that penalizes the unreliable matches. Then according to certain criteria, the multi-reference depth maps are merged into one disparity map to improve the quality of disparity map. Finally, a multilateral filtering is used to preserve details in the depth map and simultaneously smooth the depths in occluded areas at object boundary, less texture and discontinuity regions. Experimental results show a significant improvement of the initial input depth maps and coding efficiency, as well as a reduction of view synthesis artifacts.

关键词： Estimation Image coding Rendering (computer graphics) Transform coding Three dimensional displays Filtering

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Accelerating Vehicle Detection in Low-Altitude Airborne Urban Video

Accelerating Vehicle Detection in Low-Altitude Airborne Urba...

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International Conference on Image and Graphics (ICIG)

作者： Xianbin Cao Renjun Lin Pingkun Yan Xuelong Li Anhui Province Key Laboratory of Software in Computing and Communication School of Computer Science and Technology University of Science and Technology Hefei Anhui China Center of OPTical IMagery Analysis and Learning (OPTIMAL) State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy and Sciences Xi'an Shaanxi China

The limitation of the existing methods of traffic data collection is that they rely on techniques that are strictly local in nature. The airborne system in unmanned aircrafts provides the advantages of wider view angle and higher mobility. However, detecting vehicles in airborne videos is a challenging task because of the scene complexity and platform movement. Most of the techniques used in stationary platforms cannot perform well in this situation. A new and efficient method based on Bayes model is proposed in this paper. This method can be divided into two stages, attention focus extraction and vehicle classification. Experimental results demonstrated that, compared with other representative algorithms, our method obtained better performance with higher detection rate, lower false positive rate and faster detection speed.

关键词： Vehicles Feature extraction Vehicle detection Road transportation Cameras Atmospheric modeling Classification algorithms

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Directional diagnosis for wireless sensor networks

Directional diagnosis for wireless sensor networks

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International Conference on Distributed computing in Sensor systems (DCOSS)

作者： Wei Gong Kebin Liu Yunhao Liu Xibin Zhao Ming Gu Tsinghua University Beijing Beijing CN Department of Computer Science Hong Kong University of Science and Technology Hong Kong China Key Laboratory of Information System Security of Ministry of Education TNLIST School of Software Tsinghua University China

Network diagnosis is crucial in managing a wireless sensor network (WSN) since many network-related faults, such as node and link failures, can easily happen. Diagnosis tools usually consist of two key components, information collection and root-cause deduction, while in most cases information collection process is independent with root-cause deduction. This results in either redundant information which might pose high communication burden on WSNs, or incomplete information for root-cause inference that leads false judgments. To address the issue, we propose DID, a directional diagnosis approach, in which the diagnosis information acquirement is guided by the fault inference process. Through several rounds of incremental information probing and fault reasoning, root causes of the network abnormalities with high credibility are deduced. We employ a node tracing scheme to reconstruct the topical topology of faulty regions and build the inference model accordingly. We implement the DID approach in our forest monitoring sensor network system, GreenOrbs. Experimental results validate the scalability and effectiveness of this design.

关键词： Network topology Probes Topology Wireless sensor networks Sensors Relays Probabilistic logic

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Dynamic switching-frequency scaling: Scheduling overcommitted domains in xen VMM

Dynamic switching-frequency scaling: Scheduling overcommitte...

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International Conference on Parallel Processing

作者： Chen, Huacai Jin, Hai Hu, Kan Huang, Jian Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541563

Virtualization enables multiple guest operating systems run on a single physical platform. These virtual machines may host any types of application, including concurrent HPC programs. Traditionally, VMM schedulers have focused on fairly sharing the processor resources among domains, rarely consider VCPUs' behaviors. However, this can result in poor application performance to overcommitted domains if there are concurrent programs hosted in them. In this paper we review the properties of both Xen's Credit and SEDF schedulers, and show how these schedulers may seriously impact the performance of the communication-intensive and I/O-intensive concurrent applications in overcommitted domains. We discuss the origination of the problem theoretically, and confirm the derived conclusion on benchmarks. A novel approach, that dynamically scales the context switching-frequency by selecting variable time slices according to VCPUs' behaviors, is then proposed to improve the Credit scheduler more adaptive for concurrent applications. The experimental results show that this extended Credit scheduler can improve the performance of communication-intensive and I/O-intensive concurrent applications in overcommitted domains to the same magnitude as in under-committed domains. © 2010 IEEE.

关键词： Virtualization

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Measurement study of PKTown: A P2P-based Multiplayer Online Game supporting system

Measurement study of PKTown: A P2P-based Multiplayer Online ...

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International Symposium on Parallel Architectures, Algorithms, and Programming

作者： Tu, Xuping Jin, Hai Jiang, Wenbin Liao, Xiaofei Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543123

Recently, Multiplayer Online Game has been extremely popular, in which peer-to-peer technology has been introduced to help with the scaling. This paper presents a measurement study on a P2P-based MOG supporting system, called PKTown, which has been fully deployed over the CERNET. By leveraging a large set of traces obtained recently over a 4-month period, we study the benefit of P2P architecture applying to MOG supporting system, workload characteristics, players' behaviors and impact form a number of system parameters. We believe this provides insights in understanding the fundamental nature of MOG, which can be further explored to enhance the system design. © 2010 Crown Copyright.

关键词： Social networking (online)

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MT-BTRIMER: A master-slave multi-threaded dynamic binary translator

MT-BTRIMER: A master-slave multi-threaded dynamic binary tra...

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International Conference on Frontier of computer science and technology

作者： Tu, Xuping Jin, Hai Yu, Zhibin Chen, Jie Hu, Yabin Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541396

Most of the current dynamic binary translation (DBT) systems are single-threaded and many orders of magnitude slower than native execution. Although multi-core processors are becoming more and more prevalent, the single-threaded architecture prevents these DBT systems from improving their performance by making full use of the parallel execution advantage. In this paper, we present the design and implementation of a multi-threaded DBT system, named MT-BTRIMER. MT-BTRIMER employs a master-slave multi-threaded architecture. We evaluate the MT-BTRIMER system across SPEC CINT 2000 and BYTEmark test suite. The results demonstrate that MT-BTRIMER can speculatively translate on average 60% of useful target code, and reduce the total runtime by nearly 30% compared with ST-BTRIMER which is a single-threaded DBT system. © 2010 IEEE.

关键词： Memory architecture

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XenHVMAcct: Accurate CPU time accounting for hardware-assisted virtual machine

XenHVMAcct: Accurate CPU time accounting for hardware-assist...

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11th International Conference on Parallel and Distributed computing, Applications and Technologies, PDCAT 2010

作者： Chen, Huacai Jin, Hai Hu, Kan Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769542874

CPU time accounting is a basis of performance measurement and process scheduling in operating system. Accounting operations are traditionally completed in timer interrupt handler since timer interrupt is periodically delivered to OS. However, when virtualization introduced, the CPU time is shared by multiple virtual CPUs (i.e., VCPU for short) and the virtual timer interrupt is paused for those ones be scheduled out. This makes the time accounting be inaccurate, and we should consider new method for VM to provide a stable and reliable data source, especially for the hardware-assisted virtual machines (i.e., HVM for short) which are not aware of VMM. The key point of accurate CPU time accounting is to distinguish the time allocated to "this VCPU" and "other VCPUs". Para-virtualization (i.e., PV for short) achieves this goal by modifying the timer handling routines. For HVM, we propose an accurate accounting method (named XenHVMAcct) within Xen virtual platform. XenHVMAcct is designed by using the mechanisms of virtual interrupt and loadable kernel module, without direct modifications to guest OS. Experimental results show that our accounting method is as accurate as the PV solution. © 2010 IEEE.

关键词： Virtualization

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Solving Constrained Optimization Problems by an Improved Particle Swarm Optimization

Solving Constrained Optimization Problems by an Improved Par...

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International Conference on Innovations in Bio-inspired computing and Applications (IBICA)

作者： Chaoli Sun Jianchao Zeng Shuchuan Chu John F. Roddick Jengshyang Pan Complex System and Computational Intelligence Laboratory Taiyuan University of Science and Technology Taiyuan Shanxi China School of Computer Science Engineering and Mathematics Flinders University Australia Department of Electronic Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

Constrained optimization problems compose a large part of real-world applications. More and more attentions have gradually been paid to solve this kind of problems. An improved particle swarm optimization (IPSO) algorithm based on feasibility rules is presented in this paper to solve constrained optimization problems. The average velocity of the swarm and the best history position in the particle's neighborhood are introduced as two turbulence factors, which are considered to influence the fly directions of particles, into the algorithm so as not to converge prematurely. The performance of IPSO algorithm is tested on 13 well-known benchmark functions. The experimental results show that the proposed IPSO algorithm is simple, effective and highly competitive.

关键词： Optimization Particle swarm optimization Algorithm design and analysis Convergence History Educational institutions

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Vdismodel: A display latency performance model in virtualization environment

Vdismodel: A display latency performance model in virtualiza...

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6th International Conference on Semantics, Knowledge and Grid, SKG 2010

作者： Zhou, Bin Jin, Hai Yuan, Pingpeng Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541891

With the rapid development of virtualization technology as well as the good performance of computer hardware, virtual machine is beginning to gradually increase the performance of display to meet the needs of desktop users. However, there is a difference between the display mechanism in the virtual environment and the traditional environment. At present, more is focused on how to effectively and pertinently measure and assess the performance of display in virtualization environment. Taking consideration of the characteristics of display in the virtual environment, the virtual machine display performance evaluation system has following advantages: it can select a representative workload running on the VM in Domain U, make use of Tracing and Instrumentation to insert the record in the kernel of VM, log the relevant information, and then finally draw the performance-related parameters by the analysis of the recorder. This paper mainly depicts the underlying implementation details of the virtual display system in Xen and analyzes the display principle of Xen-based virtual machine. It also proposes a display latency performance model in Xen environment, which is named Vdismodel by verifying the reasonableness of the Vdismodel through a series of experiments and comparing the theoretical data and the measured data which are accessed by the virtual machine system performance evaluation. © 2010 IEEE.

关键词： Display devices

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A proxy re-encryption based sharing model for DRM

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2011年第11期5卷 385-393页

作者： Ma, Guojun Pei, Qingqi Jiang, Xiaohong Wang, Yuchen Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi'an China The State Key Laboratory of Integrated Services Networks Xidian University Xi'an China Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi'an China School of Electronic Engineering University of Electronic Science and Technology of Chaina Chengdu China

Content sharing is one of the most significant issues of Digital Rights Management (DRM). There are many requirements of rational content sharing between different users who are not family members. But, the main goals of various sharing schemes are to solve the portability problem instead of rational content sharing between different users who are not family members. In this work, we propose an initial step toward the rational sharing between different users and present a sharing model based on proxy re-encryption. Our model supports flexible sharing mechanisms, with which the user can choose any of the purchased content to share with any legal device, and the content provider can know and limit the number of the sharing devices to achieve some novel DRM policies such as pay-per-sharing. To our best knowledge, our sharing model is the first model for the content sharing between different users' devices who are not family members using proxy re-encryption. With rational applications, our model can benefit both the user and content provider to achieve win-win development.

关键词： Copyrights

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