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Contact-based congestion avoidance mechanism in delay tolerant networks 1

4th International Conference on Human-Centric computing, HumanCom'11 and the 6th International Conference on Embedded and Multimedia computing, EMC'11

作者： Yu, Chen Liang, Chuanming Li, Xi Jin, Hai Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (数字)9789400721050

ISBN: (纸本)9789400721043

Congestion in DTN is a prominent problem due to constrained resource, intermittent link and long propagation delay. Traditional congestion control mechanisms based on end-to-end feedback and rate control fail to work in such network environments. Considering the characteristics of DTN, we propose a new contact-based congestion avoidance mechanism (C2AM). The contact history and queuing information are both exploited to obtain the average sojourn time of each incoming message. Using this metric, we try to deter incoming messages with long sojourn time and large size. Motivated by Little's law, we introduce the average storage cost of each message. To our best knowledge, this is the first case where contact information is used to assist congestion control in DTNs. Using simulation, we evaluate the C2AM mechanism and show that it can avoid and alleviate congestion in DTN greatly and improves network performance. © 2011 Springer science+Business Media B.V.

关键词： Delay tolerant networks

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Fast saving and restoring virtual machines with page compression

Fast saving and restoring virtual machines with page compres...

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2011 International Conference on Cloud and Service computing, CSC 2011

作者： Deng, Li Jin, Hai Wu, Song Shi, Xuanhua Zhou, Jiangfu Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781457716362

More and more enterprises are moving beyond server virtualization to desktop virtualization in recent years. In virtualization environments, centralized shared storage systems are generally used to take advantage of virtualization features such as VM migration. Network file system (NFS) is considered to be the best choice in small or medium sized LANs due to its flexibility and low cost. But it becomes the bottleneck when many clients access the server simultaneously, especially when multiple virtual machines access a large amount of data at the same time, such as operation save and restore. In this paper, we present a new method named ComIO to quickly save and restore virtual machines using page compression. Based on the analysis of virtual machines' memory characteristics, we design a fast enhanced characteristic-based compression (ECBC) algorithm. Combined with multi-threaded techniques, the compression tasks are parallelized for significantly shortened compresssion time. Page boundary alignment is proposed to enable wanted page data to be directly extracted from the compressed block. The experimental results demonstrate that compared with Xen, our method ComIO not only greatly reduces the time spent on saving and restoring virtual machines on average, but also indirectly augments the effective storage space. © 2011 IEEE.

关键词： Virtual machine

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Graphic acceleration mechanism for multiple desktop system based on virtualization technology

Graphic acceleration mechanism for multiple desktop system b...

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14th IEEE Int. Conf. on Computational science and Engineering, CSE 2011, the 11th International Symposium on Pervasive systems, Algorithms, and Networks, I-SPAN 2011, and the 10th IEEE Int. Conf. on Ubiquitous computing and Communications, IUCC 2011

作者： Li, He Jin, Hai 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)9780769544779

Multiple-desktop environment system (MPDS) based on virtualization technology focuses on improving user experiences of desktop applications. However, the current graphic performance of MPDS cannot satisfy the various desktop applications. Therefore, enhancing the graphic performance of MPDS is a key issue in virtual desktop environment. Leverage existing technical conditions, we propose a graphic acceleration mechanism to solve the problem. This graphic acceleration mechanism of MPDS provides better graphic performance than existing virtual machine systems. Using the graphic acceleration mechanism, virtual machines without hardware rendering capability in MPDS could execute complex graphic applications and display these with good effect. In the analysis, we have the conclusion that the graphic performance with the graphic acceleration mechanism is much better than before. © 2011 IEEE.

关键词： Virtual machine

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Petri net-based scheduling analysis of dual-arm cluster tools with wafer revisiting

Petri net-based scheduling analysis of dual-arm cluster tool...

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IEEE International Conference on Automation science and Engineering (CASE)

作者： Yan Qiao NaiQi Wu MengChu Zhou Department of Industrial Engineering School of Electro-Mechanical Engineering Guangdong University of Technology Guangzhou China The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

With wafer revisit, it is complicated to schedule cluster tools in semiconductor fabrication. In wafer fabrication processes, such as atomic layer deposition (ALD), the wafers need to visit some process modules for a number of times. The existing swap-based strategy can be used to operate a dual-arm cluster tool for such a process. It results in a 3-wafer cyclic schedule. However, it is not optimal in the sense of cycle time. Thus, to search for a better schedule, a Petri net model is developed for a dual-arm cluster tool with wafer revisit. With it, the properties of the 3-wafer schedule are analyzed. It is found that, to improve the performance, it is necessary to reduce the number of wafers completed in a cycle. Thus, a 1-wafer schedule is developed by using a new swap-based strategy.

关键词： Robots Schedules Semiconductor device modeling Firing Steady-state Load modeling Transient analysis

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VESS: An unstructured data-oriented storage system for multi-disciplined virtual experiment platform 1

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4th International Conference on Human-Centric computing, HumanCom'11 and the 6th International Conference on Embedded and Multimedia computing, EMC'11

作者： Jiang, Wenbin Li, Hao Jin, Hai Zhang, Lei Peng, Yaqiong Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (数字)9789400721050

ISBN: (纸本)9789400721043

The maintenance of unstructured data for a large data-related system is still a hard nut to crack, especially in the multi-disciplined virtual experiment platform (MDVEP), where lots of unstructured data are produced, small in size and coming from various applications. This paper presents a new storage system named VESS for unstructured data from MDVEP, which can improve the performance of the system and simplify the development of upper-layer applications. It provides HTTP-based data request method as system user-friendly interface. Index table relying on a universal metadata file is used to ensure the consistency and integrity of replicas. Message queue is adopted to sequence modification operations and guarantee consistency, while signature-based authentication guarantees the security. Experimental results show that VESS can serve as a data storage service for virtual experiment with high performance. © 2011 Springer science+Business Media B.V.

关键词： Virtual reality

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MoClouDesk: Virtualized desktop for mobile environment

MoClouDesk: Virtualized desktop for mobile environment

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作者： Liao, Xiaofei Jin, Hai Bao, Zheng Li, He Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544779

Mobile devices such as PDAs and cellphones, limited to its' computing and storage capability, are not capable to run ordinary PC applications. But virtualization technology gives us another choice: the software can run on a server (generally in a virtual machine) and the user interface is transmitted to the client. We have developed MoClouDesk, a virtualized desktop architecture for mobile devices, which provides a real virtual working environment. MoClouDesk virtualizes the desktop by forming a desktop environment, similar to local desktop, while all the applications are running on the virtual machine of remote servers. Users can use different applications from cross-platform operating systems, and use them just the same as local applications. Users could personally customize and update the applications list from the application templates library. This paper explores how to build a virtual desktop environment for mobile device. Experiments demonstrate and evaluate its efficiency and effectiveness. © 2011 IEEE.

关键词： Virtualization

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Measuring and analyzing CPU overhead of virtualization system

Measuring and analyzing CPU overhead of virtualization syste...

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2011 IEEE Asia-Pacific services computing Conference, APSCC 2011

作者： Tong, Guan Jin, Hai Xie, Xia Cao, Wenzhi 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)9780769546247

Virtualization as a powerful and convenient technique has been widely used recently. Inserting the VMM between the hardware and operation system enables multiple virtual machines simultaneously running on hardware. However, these changes in system architecture, while improving the whole physical computing resources' utilization, also pay a certain price for virtualization. How to measure this part of CPU overhead, and how about the relationship between this part of CPU overhead and virtual machine number and the type of workload executing in virtual machine are two important questions to the further research of virtualization performance. In this paper we provide a system to measure the overhead of virtualization. With this system we could dynamically obtain the utilization of computing resource. Based on the analysis to the results of several experiments, we compare and study the relationship between the different factors and the overhead of virtualization. Finally, we predict the probably trend of the overhead under the impact of some factors. © 2011 IEEE.

关键词： Virtualization

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Sharing virtual USB device in virtualized desktop

Sharing virtual USB device in virtualized desktop

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2011 4th International Symposium on Parallel Architectures, Algorithms and Programming, PAAP 2011

作者： Liao, Xiaofei Xie, Xiao Jin, Hai Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769545752

With the development of computer science, desktop virtualization technology is more and more popular. In virtualized desktop, it is a very significant research to share periphery devices in the client-end computer seamlessly. We implement a device sharing mechanism to extend the universal serial bus in client-end host to the network for server-end host using transparently. This virtual device bus is deployed in the driver layer so that most applications and drivers in virtualized desktop could access remote shared devices through original interface. After deploying the virtual device bus driver, the duplicated virtual device could be accessed just like a real local device. In our implementation, the virtual device bus driver, which is the main module for virtualizing real USB devices and the interface for applications, is OS independent. Experiments show that the mechanism has a very friendly and easy interface to access virtual USB devices, and good performance. © 2011 IEEE.

关键词： Buses

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Efficient person recognition by Finger-Knuckle-Print based on 2D Discrete Cosine Transform

Efficient person recognition by Finger-Knuckle-Print based o...

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International Conference on Information technology and e-services (ICITeS)

作者： Mohammed Saigaa Abdallah Meraoumia Salim Chitroub Ahmed Bouridane Signal and Image Processing Laboratory Electronics and Computer Science Faculty University of Sciences and Technology Houari Boumediene Algiers Algeria School of Computing Engineering and Information Sciences Northumbria University Newcastle-upon-Tyne UK

Biometric system has been actively emerging in various industries for the past few years, and it is continuing to roll to provide higher security features for access control system. In the recent years, hand based biometrics is extensively used for personal recognition. In this paper a new biometric system based on texture of the hand knuckles, namely Finger-Knuckle-Print (FKP), is proposed. To extract the image local texture information and represent the FKPs features, the 2D Block based Discrete Cosine Transform (2D-BDCT), is employed. Finally, performance of all finger types is determined individually and a min rule fusion is applied to develop a multimodal system. Experimental results show that 2D-DCT-mod2 yields the best performance for identifying FKPs and it is able to provide an excellent recognition rate and provide more security.

关键词： Feature extraction Biometrics Databases Vectors Thumb Discrete cosine transforms

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Reconstructing 3D human poses from uncalibrated monocular images with strong perspective effects

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Journal of Computational Information systems 2012年第15期8卷 6437-6445页

作者： Chen, Shu Peng, Xiaoning School of Information Engineering Xiangtan Universtiy Xiangtan 411105 China Key Laboratory of Intelligent Computing and Information Processing Ministry of Education Xiangtan 411105 China School of Information Science and Engineering Central South University Changsha 410083 China Department of Computer Science and Technology Huaihua College Huaihua 418008 China

This paper present a geometric method to reconstruct human motion pose from 2D point correspondences obtained from uncalibrated monocular images. The proposed algorithm can handle images with very strong perspective effects, which is guaranteed by the fact that only one scale factor corresponding to the root joint in the skeleton model is required estimating. To take fully advantage of this fact, a system of two nonlinear equations with two variables to estimate the scale factor of the root joint is established, and the scale factor of the root joint is optimized by the Gauss-Newton iterative scheme. At last, a framework to reconstruct human motion pose is presented. Quantitive analysis of the experiment results based on several real monocular video sequences shows the accuracy of the scale factor as well as the accuracy of the pose reconstruction. © 2012 Binary Information Press.

关键词： Nonlinear equations

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