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A Data Transfer Scheme of grid Workflow Based on Weighted Directed Graph

A Data Transfer Scheme of Grid Workflow Based on Weighted Di...

引用

International Conference on grid and Cooperative computing Workshops (GCCW)

作者： Song Wu Hai Jin Kang He Zongwei Luo Cluster and Grid Computing Laboratory School of Computer Huazhong University of Science and Technology Wuhan China E-Business Technology Institute University of Hong Kong Hong Kong China

In a grid workflow, data transfer scheme plays a key role on its performance. In most grid projects, data is transferred between source and destination directly in the traditional way, without considering the status of network. In this paper, we present a data transfer scheme of grid workflow based on weighted directed graph. The scheme selects data transfer model according to the job's data processing rate. Based on the different bandwidths between grid nodes, it builds a weighted directed graph to select a best transfer path. Simulation results show that the scheme can effectively improve the performance of grid workflows

关键词： grid computing Protocols Bandwidth Data processing Resource management Dynamic programming Dynamic scheduling Workflow management software Service oriented architecture Web services

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Scheme for Ensuring Data Security on Cloud Data Storage in a Semi-trusted Third Party Auditor

Scheme for Ensuring Data Security on Cloud Data Storage in a...

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International Conference on computer science and Network technology

作者： Zaid Alaa Hussien Hai Jin Zaid Ameen Abduljabbar Mohammed Abdulridha Hussain Salah H. Abbdal Deqing Zou Cluster and Grid Computing Lab Big Data Technology and System Lab Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781467381741

Cloud computing is a promising information technology service that allocates and reallocates resources when a client requires virtual data storage and network facility at any time and place. Cloud computing provides large data storage and management services at the lowest cost. Thus, it is crucial for many organizations and clients who seek such services. Data security and integrity are necessary and play important roles. However, these two issues are facing significant challenges. Therefore, a robust scheme is required to ensure security and privacy while transmitting or storing data in the cloud storage environment. We propose an efficient and robust scheme to ensure data security in a semi-trusted third party auditor. Our scheme adopts an advanced encryption standard to support data owner privacy, a cryptography hash function to maintain data owner integrity, and elliptic curve cryptography to ensure data confidentiality, correctness, and security when transmitting data over unsecure channels. A security analysis confirms that our scheme can withstand man-in-the-middle attack and provides data correctness.

关键词： Cloud storage data security elliptic curve cryptography hash function integrity semi-trusted third party auditor Data Security Elliptic curve cryptography cryptography Cloud computing computer information security Data Storage Scheme auditor Third party customers Management services Transmitting Data

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Grey Prediction Control of Adaptive Resources Allocation in Virtualized computing System

Grey Prediction Control of Adaptive Resources Allocation in ...

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IEEE International Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Xianghua Xu Yanna Yan Jian Wan Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

In order to improve the resource utilization of virtual machine and control the resource allocation online effectively, in this paper, we present a grey prediction control model used for dynamic resource allocation in virtual machine as workloads changing. First, we forecast the allocation of virtualized resources by the grey control model. We also adjust the boundary conditions of grey prediction model to make the prediction more accurately. Then, the control theory is used to feedback control resource utilization to obtain desired resource utilization levels by regulating the value of allocation of virtualized resources automatically. Our experimental results show the grey control model is effective in the virtualized resource allocation. The control model and algorithm can be applied to other resource allocation.

关键词： Control systems Programmable control Adaptive control Resource management Resource virtualization Predictive models Automatic control Virtual machining Boundary conditions Control theory

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MSNAP: Fault Tolerant Event Localization in Wireless Sensor Networks

MSNAP: Fault Tolerant Event Localization in Wireless Sensor ...

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Xianghua Xu Xueyong Gao Jian Wan Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

This paper investigates event localization in wireless sensor networks. We improve the SNAP (Subtract on Negative Add on Positive) localization algorithm and propose the MSNAP (Modified Subtract on Negative Add on Positive) localization algorithm with higher localization accuracy and better performance of fault tolerance. First, every sensor node obverses the event signal and compares its observed reading with a threshold. If the reading is above the threshold, the node will send it to the sink station. Otherwise, it remains silent. Based on the observed readings which the nodes report, the sink station constructs the likelihood matrix by simply adding ± 1 contributions in the area around the nodes, whose maximum value points to the event location. Compared with the SNAP algorithm, when constructing the likelihood matrix, MSNAP dynamically adjusts the size of estimated region depending on the observed readings the nodes reported. Experimental results show that the algorithm effectively improves the localization accuracy and fault tolerance.

关键词： Accuracy Base stations Fault tolerance Fault tolerant systems Wireless sensor networks Noise Heuristic algorithms

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Analysis and Evaluation of the Scheduling Algorithms in Virtual Environment

Analysis and Evaluation of the Scheduling Algorithms in Virt...

引用

International Conference on Embedded Software and Systems

作者： Xindong You Xianghua Xu Jian Wan Congfeng Jiang Grid and Service Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

ISBN: (纸本)9781424443598

Virtual machine technologies currently receive great interest both in industry and research communities. And it is one of the most important technologies for the coming Cloud computing. We surveyed the CPU scheduling algorithms in Xen and VMWare systems, and found that both of them use a distinctive VCPUs running queue for each physical CPU, which is referred to Partition Queue Model (PQM) in this paper. As a contrast, a Sharing Queue Model (SQM) of CPU scheduling algorithm is proposed. The simulation experiments results show that the sharing queue model of CPU scheduling achieves better performance than the partition queue model and the deduction from Queue Theory also confirms the results. Moreover, with the CPU utilization increased, the advantage of Sharing Queue Model over Partition Queue Mode is more evident in response time.

关键词： Algorithm design and analysis Scheduling algorithm Virtual environment Queueing analysis Virtual machine monitors Job shop scheduling Voice mail Virtual machining Embedded software Virtual manufacturing

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Notice of Violation of IEEE Publication Principles: Research on Synchronous Low Power Listening for Collection Tree Protocol in WSN

Notice of Violation of IEEE Publication Principles: Research...

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Jian Wan Xin Luo Xianghua Xu Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

Notice of Violation of IEEE Publication Principles "Research on Synchronous Low Power Listening for Collection Tree Protocol in WSN" by Jian Wan, Xin Luo, Xianghua Xu in the Proceedings of the 2010 IEEE Asia-Pacific Services computing Conference pp. 394-399 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles. This paper contains portions of original text and from the paper cited below. The original text was copied with insufficient attribution (including appropriate references to the original author(s) and/or paper title) and without permission. "Poster Abstract: Harvester - Energy Savings Through Synchronized Low-power Listening" by Roman Lim, Matthian Woehrle, Andreas Meir, Jan Beutel in the Proceedings of the 6th European Workshop on Sensor Networks (EWSN 2009), February 2009, pp. 29-30 Data collection is the fundamental and important function in wireless sensor networks. Due to the restriction of node power, how to improve the node's energy efficiency and prolong the network lifetime is an important issue in practical network deployment. In this paper, we propose the RS-LPL - Relative Synchronized Low-Power Listening which uses the relative time synchronization to improve the traditional low power listening scheme, and realize the RS-LPL in Collection Tree Protocol to enhance the network energy efficiency and prolong the network lifetime. The experiment results in a network consisted of Telosb mote shows that RS-LPL is more energy efficiency than traditional low power listening.

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Design of Wireless Sensor Network Management System Based on ZigBee technology

Design of Wireless Sensor Network Management System Based on...

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International Workshop on Intelligent Systems and Applications, ISA

作者： Jian Wan Daxi Wang Xianghua Xu Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

ISBN: (纸本)9781424458721;9781424458745

Problems of Wireless Sensor Networks (WSN) caused in the laboratory are predictable, and easy to resolve. While in the deployment and management phases, a number of factors in the environment raise more problems that are difficult to predict or simulation than in laboratory condition. To effective manage and monitor those problems, an effective management mechanism is needed, which analysis the problems and enables managers configure the networks and deal with exceptions. Wireless sensor networks are application-related systems, different scenarios the network structure and function are quite different. There is no uniform standard of network infrastructure design and implementation of communication protocols, which leading to the present there is no unified network management standards. In this paper, we developed a wireless sensor network visualization management system based on the ZigBee technique, which has data management, data changes and topology visualizing, offline analysis, and the initial network fault detection functions.

关键词： Wireless sensor networks technology management ZigBee Communication standards Data visualization Laboratories Environmental management Predictive models Protocols Network topology

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A Utility-Based Adaptive Resource Allocation Policy in Virtualized Environment

A Utility-Based Adaptive Resource Allocation Policy in Virtu...

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IEEE International Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Jian Wan Peipei Shan Xianghua Xu Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

How to meet the QoS of the applications and improve resource utilization is an important problem in virtualized environment. In this paper, we propose a utility based resource allocation policy with QoS constrained in virtualized environment. Firstly, we build a model reflecting the mapping relation between performance metrics and resource allocation through Web server benchmarking experiments. Then, we devise a utility function as objective to optimizing the total utility and achieving a reasonable resource allocation. Finally, based on the model and the requirements of the applications QoS, we present an optimized policy for resource allocation in virtualized system. The simulation results show that the utility-based policy is effective to allocate resource from user perspective while improving the resource utilization.

关键词： Resource management Resource virtualization Application virtualization Quality of service grid computing Application software Costs Measurement Web server Hardware

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Improve the Completeness of Passive Monitoring Trace in Wireless Sensor Network

Improve the Completeness of Passive Monitoring Trace in Wire...

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Xianghua Xu Chao Tong Jian Wan Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

The performance evaluation of wireless sensor network based on passive monitoring restricted by two respects: first, passive monitoring trace is incomplete, because monitors can not capture every transmission in the network. Second, the information directly extracted from trace is insufficient. Performance evaluation always needs some implicit information, e.g., packet reception. To solving the problems above, we use two processing steps to construct an enhanced trace of network. First, an online merging procedure combines the incomplete traces of various monitors into a single more complete trace. Next, an inference procedure based on finite state machine reconstructs packets that were not captured by any monitor and determines whether a packet was received by its destination. Merging and inference procedure are realized in CTP Network which is incorporated with TinyOS. The evaluation is performed on simulation. The experiment results show that, if the trace contains more than 70% of the total packets, the engine can infer 20%-25% more loss packets and 90% packets' reception.

关键词： Monitoring Merging Wireless sensor networks Protocols Routing Automata Accuracy

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Regulative Growth Codes: Enhancing Data Persistence in Sparse Sensor Networks

Regulative Growth Codes: Enhancing Data Persistence in Spars...

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Xianghua Xu Chao Shen Jian Wan Grid and Services Computing Laboratory School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China

Growth Codes (GC) enhances the data persistence in dense sensor networks. However, GC exchanges data with neighbors in a completely random way, which may lead to uneven sensor data distribution in sparse sensor network. This significantly reduces the efficiency of GC data acquisition and fault-tolerance in sparse sensor network with less connectivity. In this paper, we propose Regulative Growth Codes (RGC) which use a random sequencing policy in data exchange operation instead of the completely random policy used in GC, and introduce the self-detection mechanism to reduce the redundant exchange. Simulation results show that the performance of RGC is better than GC in sparse sensor networks.

关键词： Encoding Fault tolerance Fault tolerant systems Network coding Network topology Routing Simulation

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