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共 349 条记录，以下是121-130 订阅

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Invalid pointer dereferences detection for CPS software based on extended pointer structures

Invalid pointer dereferences detection for CPS software base...

引用

2012 IEEE 6th International Conference on Software Security and Reliability Companion, SERE-C 2012

作者： Dong, Longming Dong, Wei Chen, Liqian National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769547435

Invalid pointer dereferences, such as null pointer dereferences, dangling pointer dereferences and double frees, are a prevalent source of software bugs in CPS software, due to flexible dereferencing pointers along various pointer fields. Existing tools have high overhead or are incomplete, thereby limiting their efficiency in checking the kind of CPS software with shared and mutable memory. In this paper, we present a novel extended pointer structure for detecting all invalid pointer dereferences in this kind of CPS software. We propose an invalid pointer dereferences detection algorithm based on the uniform transformation of abstract heap states. Experimental evaluation about a set of large C benchmark programs shows that the proposed approach is sufficiently efficient in detecting invalid pointer dereferences of CPS software with shared and mutable memory. © 2012 IEEE.

关键词： Program debugging

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Precise pointer analysis for list-manipulating programs based on quantitative separation logic

Precise pointer analysis for list-manipulating programs base...

引用

2012 IEEE International Conference on Information Science and Technology, ICIST 2012

作者： Dong, Longming Chen, Liqian Liu, Jiangchao Li, Renjian National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9781457703454

Full precise pointer analysis has been a challenging problem, especially when dealing with dynamically-allocated memory. Separation logic can describe pointer alias formally, but cannot describe the quantitative reachability between pointers. In this paper, we present a symbolic framework for analyzing the reachability between pointers in list-manipulating programs. The precise points-to relations of pointers in lists are described by formulae of quantitative separation logic (QSL), and the analysis framework is based on the operational and rearrangement rules about the assignments of pointers. The fixpoint calculus and the counter symbolic abstraction are used to find loop invariants. We can get precise relations between pointers at each point of list-manipulating programs. In the end, several initial examples about list-manipulating programs are given to show that the approach can get precise pointer analysis for list-manipulating programs. © 2012 IEEE.

关键词： computer circuits

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Bodhi: Detecting buffer overflows with a game

Bodhi: Detecting buffer overflows with a game

引用

2012 IEEE 6th International Conference on Software Security and Reliability Companion, SERE-C 2012

作者： Chen, Jie Mao, Xiaoguang National Laboratory for Parallel and Distributed Processing Changsha China School of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9780769547435

Buffer overflow is one of the most dangerous and common vulnerabilities in CPS software. Despite static and dynamic analysis, manual analysis is still heavily used which is useful but costly. Human computation harness humans' time and energy in a way of playing games to solve computational problems. In this paper we propose a human computation method to detect buffer overflows that does not ask a person whether there is a potential vulnerability, but rather a random person's idea. We implement this method as a game called Bodhi in which each player is shown a piece of code snippet and asked to choose whether their partner would think there is a buffer overflow vulnerability at a given position in the code. The purpose of the game is to make use of the rich distributed human resource to increase effectiveness of manual detection for buffer overflows. The game has been proven to be efficient and enjoyable in practice. © 2012 IEEE.

关键词： Buffer storage

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Providing information services for wireless sensor networks through cloud computing

Providing information services for wireless sensor networks ...

引用

2012 7th IEEE Asia-Pacific Services Computing Conference, APSCC 2012

作者： You, Pengfei Peng, Yuxing Gao, Hang National Key Laboratory for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha China

ISBN: (纸本)9780769548975

Wireless sensor networks (WSN) is a critical technology for information gathering covering many areas, including health-care, transportation, air traffic control and environment monitoring. Despite wide use, the fast increasing data emanating from WSN is not fully utilized due to the limitation for structure of WSN itself. Along with the further development of WSN, the data form which is not be efficiently managed and applied to supply information services for users. As the emerging IT technology, cloud computing supplies powerful utilization ability for IT resources, which makes many traditional applications migrate to cloud computing. In this paper, we propose a framework integrating cloud computing paradigm and WSN, which fully uses data process ability and service model for cloud computing. In the framework, data form WSN are efficiently utilized and managed, depending on which, information services for WSN are well provided to users. © 2012 IEEE.

关键词： Virtualization

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Research of context situation awareness technology

Research of context situation awareness technology

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作者： Shi, Dianxi Wu, Zhendong Ding, Bo Yan, Huining National Key Laboratory for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769546698

Context situation, which means a snapshot of the status of the real world, is formed by integrating a large amount of contexts collected from various resources. How to get the context situation and use the situation to provide better services is a challenging issue. In this paper, we focused on this challenge on the basis of the mobile cloud computing architecture. An abstract model is proposed in this paper to uniformly collect the context and send them to cloud. A rule-based large-scale context aggregation algorithm is also proposed which utilizes the MapReduce computing paradigm. Finally, a large-scale context management framework based on the abstract model and the context aggregation algorithm is proposed, and a real-time traffic demo is implemented to verify the validity of the framework. © 2012 IEEE.

关键词： MapReduce

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An efficient packing algorithm for spatial keyword queries

An efficient packing algorithm for spatial keyword queries

引用

6th International Conference on Convergence and Hybrid Information Technology, ICHIT 2012

作者： Pan, Jinkun Li, Dongsheng Li, Liming National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology 410073 Changsha China Shanghai Garrision 200040 Shanghai China

ISBN: (纸本)9783642326448

With the increase of location-based services, Web contents are being geo-tagged, and spatial keyword queries that retrieve objects satisfying both spatial and keyword conditions are gaining in prevalence. Unfortunately, the state-of-the-art packing algorithms only focus on spatial relationship, and they are not fit for the spatial keyword queries. In this paper, we propose a new packing algorithm named KBS which takes both location and keyword information into consideration, thus optimizing R-tree for spatial keyword queries. Experimental results on both real and synthetic datasets show that our method achieves high performance and space utilization. © 2012 Springer-Verlag.

关键词： Location based services

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OONS: An object oriented neuronal simulator

OONS: An object oriented neuronal simulator

引用

2012 International Applied Mechanics, MechatronicsAutomation and System Simulation Meeting, AMMASS 2012

作者： Xu, Shuai Zhang, Baida Su, Yan Dept.of Information Engineering of the Academy of Armored Force Engineering Beijin China National laboratory for Parallel and Distributed Processing School of Computer NUDT China

OONS is a new Object Oriented Neural Simulator. The goal creating it is making the construction of neural model as quickly and easily as possible for the users, and can run in shorter time than other simulators. OONS is written in C++ programming language and using crank-Nicholson implicit integral method to allow for efficient simulations. Because of multi-level package, it is suitable both for beginners and for experts, especially the simulating algorithm researchers. We test OONS by Rallpacks benchmark set, the results show that OONS is higher efficient and more precision. © (2012) Trans Tech Publications, Switzerland.

关键词： Simulators

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Support efficient and fault-tolerant multicast in bufferless network-on-chip

Support efficient and fault-tolerant multicast in bufferless...

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作者： Feng, Chaochao Lu, Zhonghai Jantsch, Axel Zhang, Minxuan Yang, Xianju National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology China Department of Electronic Systems Royal Institute of Technology Sweden

SUMMARY In this paper, we propose three Deflection-Routing-based Multicast (DRM) schemes for a bufferless NoC. The DRM scheme without packets replication (DRM-noPR) sends multicast packet through a non deterministic path. The DRM schemes with adaptive packets replication (DRM-PR-src and DRMYR-all) replicate multicast packets at the source or intermediate node according to the destination position and the state of output ports to reduce the average multicast latency. We also provide fault tolerant supporting in these schemes through a reinforcement learning based method to reconfigure the routing table to tolerate permanent faulty links in the network. Simulation results illustrate that the DRM-PR-all scheme achieves 4l6o, 43cc and 37% less latency on average than that of the DRM-noPR scheme and 27cc, 29cc and 2S6o less latency on average than that of the DRM-PR-src scheme under three synthetic traffic patterns respectively. In addition, all three fault tolerant DRM schemes achieve acceptable performance degradation at various link fault rates without any packet lost. Copyright © 2012 The Institute of Electronics, Information and Communication Engineers.

关键词： Network-on-chip

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A malicious code detection method based on statistical analysis

A malicious code detection method based on statistical analy...

引用

2012 9th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2012

作者： Wu, Yunlong Chen, Chen Wang, Huiquan Zhou, Jie Xu, Xinhai National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha Hunan 410073 China School of Computer National University of Defense Technology Changsha Hunan 410073 China

ISBN: (纸本)9781467300223

The malicious code detection based on behaviors has proved effective. But there are high false positives and high false negatives when using this method. Because the behaviors are always out-of-order and redundant. To solve these problems, this paper proposes a detection method based on statistical analysis. Firstly, this method uses association rules to sort out the behaviors, and then we can get the integrated and accurate behavior sequences. Secondly, by using the association algorithm we can pick up the signatures of behavior sequences. In addition, this method can detect the signatures to judge the threat based on statistical analysis. Experimental results indicate that it can reduce both the false positives and the false negatives effectively. © 2012 IEEE.

关键词： Statistical methods

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Research on malicious code detection based on least-squares estimation

Research on malicious code detection based on least-squares ...

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2012 International Conference on computer Science and Electronics Engineering, ICCSEE 2012

作者： Wu, Yunlong Chen, Chen Wang, Huiquan Xu, Xinhai Zhou, Jie National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha Hunan 410073 China School of Computer National University of Defense Technology Changsha Hunan 410073 China

ISBN: (纸本)9780769546476

Malicious code detection based on behaviors is the development direction of anti-virus techniques. However, the current detection methods based on this theory expose several problems such as the unclearness of behavior sequence analysis and the high false negatives. For this situation, this paper proposes a malicious code detection method based on least-squares estimation. In this method, it correlates program behaviors with time and subject-object, and then constitutes an accurate and complete behavior sequence. It can provide a preprocessing method for the subsequent detection. In order to improve the accuracy and intelligence of malicious code detection, we introduce the concept of expert subjective degree. By modeling malicious samples based on least-squares estimation we can train the Expert Subjective Degree Vector (ESDV) and simulate experts to judge the threat values of malicious codes. Experiments show that this method is more accurate than the current ways to detect the malicious codes which execute themselves in sub-period and sub-process ways, so it can be used as an effective complement of the current anti-virus software. © 2012 IEEE.

关键词： Codes (symbols)

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