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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： Li, Yaqiong Huang, Yongbing Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China Graduate University Chinese of Academy of Sciences China

ISBN: (纸本)9780769541082

In current virtualized cloud platforms, resource provisioning strategy is still a big challenge. Provisioning will gain low resource utilization based on peak workload, and provisioning based on average work loads will sacrifice the potential revenue of cloud customers because of bad user experiences. VM-based performance isolation also restrains resource flowing on demand. As to memory, this eventually results in under-loaded memory and over-loaded memory in the same data center. This paper proposes a VM-oblivious dynamic memory optimization scheme, TMemCanal, which leverages under-loaded memory in a data center to accommodate the needs of loaded memory dynamically in a transparent fashion. TMemCanal is able to identify the under-loaded memory located in different VMs and reuse it in a way of memory flowing without any modification to their Guest OSs. We implemented TMemCanal through extending Xen hypervisor and evaluated using SpecWeb 2005 and LinkPack Benchmarks. Our evaluation shows that TMemCanal can efficiently save memory up to 50% with an overhead less than 7%. Our case study of server consolidation also shows TMemCanal can promote the performance of memory-intensive services up to 400%. © 2010 IEEE.

关键词： Virtual machine

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Attribute recursive algorithms based on knowledge rough representation

Attribute recursive algorithms based on knowledge rough repr...

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International Conference on Information and Business Intelligence, IBI 2011

作者： Li, Dao-Guo Fan, Zhuo-Bin Chen, Yang School of Management Hangzhou Dianzi University Hangzhou 310018 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 China

ISBN: (纸本)9783642290862

Existing representative research achievement of the relevant literatures focused on two *** is how to improve the efficiency of attribute reduction algorithms in all attributes including the added properties. Such as the recursive algorithm to change conjunctive normal form into disjunctive normal form based on the boolean matrix and the algorithm based on radix sorting for computing core and reductions of a given information system, etc. On the other hand focus on the objects recursive algorithms. The drawback is that these methods have not fully use the knowledge gained when some attributes was added to a discussion on the domain. Therefore, the regularity of the core and reduction's changes under adding new attributes into a given information system were discussed. Moreover, the incremental reduction algorithms from a information system was proposed. The experiments show that these algorithms can quickly and exactly calculate new core and reduction of the new information system by taking advantage of the knowledge of the original information system. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Rough set theory

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WSHLA: Web services-based HLA collaborative simulation framework

WSHLA: Web services-based HLA collaborative simulation frame...

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4th International Conference on Cooperative Design, Visualization, and Engineering, CDVE 2007

作者： Hengye, Zhu Guangyao, Li Lulai, Yuan CAD Research Center Tongji University Shanghai 201804 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China

ISBN: (纸本)9783540747796

Collaborative simulation technology is an important factor in improving the efficiency of complex product design. Although High Level Architecture (HLA)-based simulation technology can meet the needs for simulation in product design, it's also marked by many deficiencies. In this paper, we focus on the introduction of web services into HLA simulation system and propose a Web services-Based HLA Collaborative Simulation Framework (WSHLA). The framework uses web services to encapsulate the invocations of HLA services and then make simulation system more interoperable and reusable. Firstly, the overall structure of WSHLA and the proxy, which acts on behalf of a federate and interacts with Runtime Infrastructure (RTI), are presented. Then, the detailed design and implementation process of WSHLA are discussed. Experimental results show that, using web services, the framework can make up for the deficiencies in HLA simulation system and ensure WSHLA-based collaborative simulation goes smoothly at the expense of some time. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Web services

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Redundant data composition of peers in p2p streaming systems using cauchy reed-solomon codes

Redundant data composition of peers in p2p streaming systems...

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6th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： Xu, Guangping Wang, Fayu Zhang, Hua Li, Jingxing Key Lab of Intelligent Computing and New Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9780769537351

Erasure codes are used in many distributed applications. This paper applies Cauchy Reed-Solomon codes to P2P streaming systems which is different from classical Reed-Solomon codes. Due to churn in these systems, streaming data composition is vital for system management. We mainly concern about how to apply the coding into these systems and present the interaction among the peers and effective buffer management. This distributed sources increase the selection on disseminated encoded data and therefore statistically enhances the overall performance. © 2009 IEEE.

关键词： Reed-Solomon codes

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Cloud detection from visual band of satellite image based on variance of fractal dimension

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Journal of systems Engineering and Electronics 2019年第3期30卷 485-491页

作者： TIAN Pingfang GUANG Qiang LIU Xing School of Computer Science and Technology Wuhan University of Science and Technology Wuhan 430065 China Key Laboratory of Intelligent Information Processing and Real-Time Industrial System in Hubei Province Wuhan 430065 China Institute of Big Data Science and Engineering Wuhan University of Science and Technology Wuhan 430065 China Key Laboratory of Rich-Media Knowledge Organization and Service of Digital Publishing Content National Press and Publication Administration Beijing 100038 China

Cover ratio of cloud is a very important factor which affects the quality of a satellite image, therefore cloud detection from satellite images is a necessary step in assessing the image quality. The study on cloud detection from the visual band of a satellite image is developed. Firstly, we consider the differences between the cloud and ground including high grey level, good continuity of grey level, area of cloud region, and the variance of local fractal dimension (VLFD) of the cloud region. A single cloud region detection method is proposed. Secondly, by introducing a reference satellite image and by comparing the variance in the dimensions corresponding to the reference and the tested images, a method that detects multiple cloud regions and determines whether or not the cloud exists in an image is described. By using several Ikonos images, the performance of the proposed method is demonstrated.

关键词： cloud detection visual image satellite image variance of local fractal dimension (VLFD)

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Behavioral equivalence of security-oriented interactive systems

Behavioral equivalence of security-oriented interactive syst...

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作者： Liu, Guanjun Jiang, Changjun Department of Computer Science Tongji University Shanghai201804 China Key Laboratory of the Ministry of Education for Embedded System and Service Computing Tongji University Shanghai201804 China

In the classical computation theory, the language of a system features the computational behavior of the system but it does not distinguish the determinism and nondeterminism of actions. However, Milner found that the determinism and nondeterminism affect the interactional behavior of interactive systems and thus the notion of language does not features the interactional behavior. Therefore, Milner proposed the notion of (weak) bisimulation to solve this problem. With the development of internet, more and more interactive systems occur in the world, such as electronic trading system. Security is one of the most important topics for these systems. We find that different security policies can also affect the interactional behavior of a system, which exactly is the reason why a good policy can strengthen the security. In other words, two interactive systems with different security policies are not of an equivalent behavior although their functions (or business processes) are identical. However, the classic (weak) bisimulation theory draws an opposite conclusion that their behaviors are equivalent. The notion of (weak) bisimulation is not suitable for these security-oriented interactive systems since it does not consider a security policy. This paper proposes the concept of secure bisimulation in order to solve the above problem. Copyright © 2016 The Institute of Electronics, Information and Communication Engineers.

关键词： Petri nets

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Real-Time Communication Method for mHealth Base on Extended XMPP Protocol

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Communications and Network 2013年第3期5卷 590-595页

作者： Chenjie Shi Yu Fang The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China

Considering characteristic of mHealth communication and problems of existing methods, this paper presents a real-time communication method for mHealth based on extended XMPP protocol. The method can maintain the role status efficiently and reduce data latency during the communication process. Meanwhile, it can be extended flexibly to meet increasing communication demands of mHealth services. Furthermore, a system framework is presented to support telemonitoring scene. Finally, system implementation and feasibility tests verify the effectiveness of the method and framework.

关键词： mHealth XMPP Protocol Real-Time Communication

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A new method of mobile Ad Hoc network routing based on improved GF strategy 3

A new method of mobile Ad Hoc network routing based on impro...

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3rd IEEE International Conference on Smart Internet of Things, SmartIoT 2019

作者： Li, Ke Zhang, De-Gan Qiu, Jian-Ning Chen, Lu Tianjin Key Lab of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin300384 China Key Laboratory of Computer Vision and System Tianjin University of Technology Ministry of Education Tianjin China

ISBN: (纸本)9781728134888

We propose a new mobile ad hoc network routing method based on improved GF (greedy forwarding) strategy in this paper. In the greedy forwarding phase, the reliable communication area is calculated, and then the quality of the link is evaluated according to the relative displacement between the nodes and the maintenance time of the link. Then, according to the quality of the link, the distance from the candidate node to the destination node, and the number of the neighbor nodes, the metric value is obtained, and the node with the large metric value is selected as the next hop. When a routing hole occurs, the waiting forwarding mode is used for a period of time. After a period of time, if the current node is still a routing hole node, the right-hand rule and the left-hand rule are used, and the bypass mode is performed simultaneously. By considering three factors of the deflection angle and the residual energy of the node and the maintenance time of the link, the forwarding node as the next hop with the highest priority value is selected in each direction. According to experiments, the method of this paper has achieved good experimental results. © 2019 IEEE.

关键词： Energy utilization

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New Method of Traffic Flow Forecasting Based on QPSO Strategy for Internet of Vehicles 4

New Method of Traffic Flow Forecasting Based on QPSO Strateg...

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4th IEEE International Conference on Smart Internet of Things, SmartIoT 2020

作者： Zhang, De-Gan Du, Jing-Yu Zhang, Ting Fan, Hong-Rui Tianjin University of Technology Tianjin Key Lab of Intelligent Computing Novel Software Technology Tianjin300384 China Tianjin University of Technology Ministry of Education Key Laboratory of Computer Vision and System Tianjin China

ISBN: (纸本)9781728165141

We propose a new method of traffic flow forecasting based on quantum particle swarm optimization strategy (QPSO) for Internet of Vehicles (IOV). Establish a corresponding model based on the characteristics of the traffic flow data. The genetic simulated annealing method is applied to the quantum particle swarm method to obtain the optimized initial cluster center, and is applied to the parameter optimization of the radial basis neural network prediction model. The function approximation of radial basis neural network can be used to obtain the required data. In addition, in order to compare the performance of the methods, a comparison study with other related methods such as QPSO-RBF is also performed. Our method can reduce prediction errors and get better and more stable prediction results. © 2020 IEEE.

关键词： Forecasting

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An enhanced two-factor user authentication in wireless sensor networks

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Telecommunication systems 2013年第1期55卷 105-113页

作者： Yuan, Jian-Jun Key Laboratory of Embedded System and Service Computing of Ministry of Education Tongji University Shanghai China

Since wireless sensor networks (WSN) are often deployed in an unattended environment and sensor nodes are equipped with limited computing power modules, user authentication is a critical issue when a user wants to access data from sensor nodes. Recently, M.L. Das proposed a two-factor user authentication scheme in WSN and claimed that his scheme is secure against different kinds of attack. Later, Khan and Alghathbar (K-A) pointed out that Das’ scheme has some security pitfalls and showed several improvements to overcome these weaknesses. However, we demonstrate that in the K-A-scheme, there is no provision of non-repudiation, it is susceptible to the attack due to a lost smart card, and mutual authentication between the user and the GW-node does not attained. Moreover, the GW-node cannot prove that the first message comes from the user. To overcome these security weaknesses of the K-A-scheme, we propose security patches and prove our scheme.

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