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A Temporal Description Logic Based Access Control Model for Expressing History Constrained Policies in Semantic Web

A Temporal Description Logic Based Access Control Model for ...

引用

International Workshop on Policies for Distributed Systems and networks

作者： Fathieh Faghih Morteza Amini Rasool Jalili Sharif Network Security Center (NSC) Department of Computer Engineering Sharif University of Technology Tehran Iran

An access control model for semantic Web should be compatible with the corresponding semantic model. The access control procedure(s) should also take the semantic relationships between the entities (specified as ontologies) into account. Considering the benefits of logic-based models and the description logic foundation of semantic Web, in this paper, we propose an access control model based on a temporal variant of description logics (TL-ALCF). This logical schema enables us to express history constrained policies to enrich the policy-base with dynamic properties based on previous *** specification of each component of the model as well as the approach to define history constrained policies along with some clarifying examples are presented. The access control procedure of the model is proposed over the inference services of TL-ALCF.

关键词： Logic Access control History Semantic Web Ontologies computer security computer networks Distributed computing Electronic mail Authorization

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Mask programmable CMOS transistor arrays for wideband RF integrated circuits

Mask programmable CMOS transistor arrays for wideband RF int...

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作者： Rabieirad, Laleh Martinez, Edgar J. Mohammadi, Saeed Department of Electrical Engineering California Institute of Technology Pasadena CA 91125 United States RF Technologies Division Raytheon Network Centric Systems FortWayne IN 46808 United States School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West Lafayette IN 47907 United States

A mask programmable technology to implement RF and microwave integrated circuits using an array of standard 90-nm CMOS transistors is presented. Using this technology, three wideband amplifiers with more than 15-dB forward transmission gain operating in different frequency bands inside a 4-22-GHz range are implemented. The amplifiers achieve high gain-bandwidth products (79-96 GHz) despite their standard multistage designs. These amplifiers are based on an identical transistor array interconnected with application specific coplanar waveguide (CPW) transmission lines and on-chip capacitors and resistors. CPW lines are implemented using a one-metal-layer post-processing technology over a thick Parylene-N (15 μm) dielectric layer that enables very low loss lines ( ∼0.6 dB/mm at 20 GHz) and high-performance CMOS amplifiers. The proposed integration approach has the potential for implementing cost-efficient and high-performance RF and microwave circuits with a short turnaround time. © 2009 IEEE.

关键词： Broadband amplifiers

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A Topology Partition Algorithm based on Link Coarsening in Parallel network Simulation

A Topology Partition Algorithm based on Link Coarsening in P...

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Second International Symposium on Information Science and engineering(第二届信息科学与工程国际会议)

作者： Xianqing Yang Hongli Zhang Hui He Xing Wang Kexin Zheng Department of Computer Science and Engineering Harbin Institute of Technology Harbin China Network Information Center Harbin Institute of Technology Harbin China

ISBN: (纸本)9781424463251;9780769539911

Today's networks are facing more and more serious large-scale network attack such as worm and botnet. While such attacks can't and shouldn't be reproduced in the real network, network simulation is become more and more popular during the research. As the prerequisite of network simulation, topology partition influences the performance of simulation significantly. We suggest a new topology partition algorithm in parallel network simulation. This algorithm is a kind of agglomerative hierarchical clustering methods based on link coarsening. The experiment shows that our algorithm can finish partition on current computers in acceptable time for even around millions of vertices. Furthermore, the links between different sub-domains are fewer and the connectivity in each sub-domain is also guaranteed. Compared with the results of KMETIS, the new algorithm can reduce the edgecut more than 90% in general.

关键词： network parallel simulation topology partition link coarsening

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An Interference-Aware Power Control Scheme in Wireless Mesh networks

An Interference-Aware Power Control Scheme in Wireless Mesh ...

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International Conference on networks Security, Wireless Communications and Trusted Computing, NSWCTC

作者： Shuqiang Huang Qi-lun Zheng Network and Educational Technology Center Jinan University Guangzhou China School of Computer Science & Engineering South China University of Technology Guangzhou China

ISBN: (纸本)9781424442232

With the ability of simultaneous transmissions, multi-channel multi-interface wireless mesh networks have emerged with great potential in the improvement of network throughput and performance. Interference has the strongest effect on the available bandwidth of wireless mesh networks, but efficient power control schemes can greatly relieve the interference effect of close-by transmissions. An efficient power control scheme is introduced to achieve this objective. Simulation results prove the effectiveness of our approach and scheme can get better performance than HLF.

关键词： Power control Wireless mesh networks Mesh networks Wireless LAN Throughput Spread spectrum communication Interchannel interference Routing Wireless communication computer networks

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The application of digital image processing technology in the quantitative study of the coarse aggregate shape characteristics

The application of digital image processing technology in th...

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1st International Conference on Information Science and engineering, ICISE2009

作者： Zhang, Juan Huang, Xin-Yuan Wu, Jian Xie, Mao-Jin School of Information Science and Technology Beijing Forestry University Beijing China Department of Information and Engineering Jiangsu Maritime Institute Nanjing China Zhejiang Scientific Research Institute of Communication Hangzhou China Computer Network Information Center Chinese Academy of Science Beijing China

ISBN: (纸本)9780769538877

The angularity of coarse aggregate is a key characteristic. The high-temperature stability, low temperature anti-cracking performance and moisture susceptibility of asphalt mixture are influenced greatly when coarse aggregates are used in the asphalt pavement. Three indexes were used for quantizing the angularity of coarse aggregate. They are FI (Form Index), Angularity GM (Gradient Method) and Angularity RM (Radius Method). These three indexes can be obtained through computing the coordinates of the edge-points of the coarse aggregates. The coordinates can be obtained through image processing. The whole process is divided into the following steps: image preprocessing, image segmentation, morphological image processing and contour tracing. Automatic processing of data by computer greatly reduces the workload, and provides the convenience for calculation and storage of data. The information collection of the angularity of coarse aggregate is simplified. ©2009 IEEE.

关键词： Gradient methods

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network intrusion detection and classification with Decision Tree and rule based approaches

Network intrusion detection and classification with Decision...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Thanvarat Komviriyavut Phurivit Sangkatsanee Naruemon Wattanapongsakorn Chalermpol Charnsripinyo Department of Computer Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Network Technology Laboratory National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand

ISBN: (纸本)9781424445219

Together with the extensive deployment of computer networks, the number of network attacks is greatly increasing. These attacks affect to availability and quality of services of the networks as well as confidentiality of private or important information data. In this paper, we present two network intrusion detection (IDS) techniques which are C4.5 decision tree and Ripper rules to assess and test an online dataset(RLD09 dataset). The dataset was collected from actual environment and then preprocessed to have only 13 features which are much simpler than existing traditional dataset such as KDD99 with 41 features. Thus, the RLD09 dataset features can provide real-time detection speed with low memory and CPU consumption. Our IDSs can classify the network data into classes which are normal data, denial of service (DoS) attack, and Probe (Port Scanning) attack. Our IDS techniques give the detection rates higher than 98%. Furthermore, they can detect unknown or new attacks, where the C4.5 decision tree detection rate is about the double of the Ripper rule detection rate. These tests can prove that our techniques are effective in detecting and classifying the new unknown attacks in the real environment.

关键词： Intrusion detection Classification tree analysis Decision trees

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An Optimized Policy for Automatic Failure Recovery in Microrebootable Distributed Systems

An Optimized Policy for Automatic Failure Recovery in Micror...

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International Conference on Information Science and engineering (ICISE)

作者： Xu Lu Hui-qiang Wang Guo-sheng Zhao College of Computer science and technology Harbin Engineering of Technology Harbin China College of Computer science and technology Harbin Engineer University Harbin China Center of computer network and information Harbin Normal University Harbin China

To overcome the challenges of recovery polices generation in the presence of inaccurate failure detection, a failure recovery model for microrebootable distributed systems based on discounted Partially Observable Markov Decision Processes is presented in this paper. Thus the reasonable recovery policies are generated by solving the POMDP model. To tackle the problem of computational complexity of exact solution, a value function approximate solution called fast informed bound solution is used for the near-optimal policies. Simulation-based experimental results on a realistic network security situation prediction system demonstrate that the proposed model can be solved effectively, and the resulting policies convincingly outperform others.

关键词： Predictive models computer networks Computational complexity Computational modeling Aging Iterative methods Software systems Availability Neural networks Information science

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Research of NIDS in IPV6 Based on Protocol Analysis and Pattern Matching

Research of NIDS in IPV6 Based on Protocol Analysis and Patt...

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International Workshop on Knowledge Discovery and Data Mining (WKDD)

作者： Shu-qiang Huang Huan-ming Zhang Guo-xiang Yao Network and Educational Technology Center of Jinan University School of Computer Science & Engineering South China University of Technology Guangzhou China Network and Educational Technology Center of Jinan University Guangzhou China Information Science and Technology school of Jinan University Guangzhou China

Some network intrusion security problems of IPv6 are researched and summarized In this paper. And this paper introduces the model of general IDS and the framework of NIDS of Ipv6. Aiming at the structure characters of IPv6 protocols, a new research method of network intrusion detection system based on protocol analysis and multi-pattern matching is put forward. Protocol analysis technology can find protocol suspicious action quickly, and pattern matching technology can detect deep attack action by character matching. Finally, a detailed designing scheme and testing result are provided.

关键词： Intrusion detection Protocols Pattern analysis Pattern matching computer crime Educational technology Data security Decoding Operating systems computer security

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Gridifying teleco-services for NGN service convergence

Gridifying teleco-services for NGN service convergence

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IFIP/IEEE International Symposium on Integrated network Management

作者： Zhen Liu School of Computer and Information Technology Engineering Research Center of Network Management Technology of High Speed Railway Beijing Jiaotong University BJTU Beijing China

With more and more demands for various network services, there are many kinds of value added services provided by different service providers. These services overlap with each other and can't operate for each other. Grid service is a new progress, which basic premise is service. Grid service itself is platform-independent and has good interface for communicating with each other. For gridifying teleco-services in next-generation networks, this paper proposes a ParlayGS model and implements ParlayGS prototype. ParlayGS bases on Parlay and open grid services architecture (OGSA), which implement open and integration criteria all in one. We carried a lot of experiments. Our efforts show that ParlayGS are valid and effective, which not only supports new complex services spanning heterogeneous networks, but also enables flexible and rapid ways for service interconnection with lower protocol conversion complexity.

关键词： Next generation networking Convergence Internet telephony Prototypes Access protocols computer networks Grid computing Information technology Railway engineering computer network management

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Flow Byte Sizes Estimation from Simple Random Packet Sampling

Flow Byte Sizes Estimation from Simple Random Packet Samplin...

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International Joint Conference on INC, IMS and IDC, NCM

作者： Hai Zhang Zhuxu Yang Wenming Guo Network center Southern Medical University Guangzhou Guangdong China School of computer science Engineering South China University of Technology China

The flow byte sizes is an important metric for network measurement. Previous work on estimating the flow size distribution (in bytes) has been focus on improving sampling technique to increase measurement accuracy. In this paper, we present an algorithm of flow byte sizes estimation based on random packet sampling. Our algorithm first obtains a maximum likelihood estimator of flow length using the TCP protocol information. After that the estimation of the flow byte sizes is accomplished through a linear regression model that relies on the flow length information previously obtained. Experimental results show that our approach is effective enough to capture the network traffic characteristics.

关键词： Sampling methods Fluid flow measurement Size measurement Telecommunication traffic Traffic control computer science Biomedical engineering Maximum likelihood estimation Protocols Linear regression

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