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International Conference on Advanced Information networking and Applications Workshops (AINAW)

作者： Chiou-Yng Lee Yung-Hui Chen Department of Computer Information and Network Engineering Lunghwa University Taiwan

Recently, cryptographic applications based on finite fields have attracted much interest. This paper presents a unified systolic multiplier under the method of the multiply-by-alpha 2 and the folded technique. This circuit can be suited for implementing both multiplication and squaring in GF(2 m ). The results show that our proposed multiplier saves about 75% space complexity and 50% latency as compared to the traditional multipliers proposed by Yeh et al. and Wang-Lin. Also, the proposed squarer saves about 45% space complexity as compared to the traditional squarer presented by Guo and Wang.

关键词： computer architecture Concurrent computing Polynomials Delay Galois fields Signal processing algorithms Complexity theory computer networks Cryptography Arithmetic

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Exception diagnosis architecture for open multi-agent systems

Exception diagnosis architecture for open multi-agent system...

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5th Workshop on Software engineering for Large-Scale Multi-Agent Systems, SELMAS 2006

作者： Shah, Nazaraf Chao, Kuo-Ming Godwin, Nick Software Engineering Research Group Sheffield Hallam University Sheffield United Kingdom DSM Research Group Department of Computer and Network Systems Coventry University Coventry United Kingdom

ISBN: (纸本)9783540731306

Multi-Agent Systems (MAS) are collection of loosely coupled intelligent agents. These systems operate in a distributed, highly dynamic, unpredictable and unreliable environment in order to meet their overall goals. Agents in such an environment are vulnerable to different types of run time exceptions. It is necessary to have an effective exception diagnosis and resolution mechanism in place in order to ensure reliable interactions between agents. In this paper, we propose novel exception diagnosis architecture for open MAS. The proposed architecture classifies the runtime exceptions and diagnoses the underlying causes of exceptions using a heuristic classification technique. The proposed architecture is realised in terms of specialised exception diagnosing agents known as sentinel agents. The sentinel agents act as delegates of problem solving agents and mediate interactions between them. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Multi agent systems

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Anger filter in agent simulation of human behavior

Anger filter in agent simulation of human behavior

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18th IASTED International Conference on Modelling and Simulation, MS 2007

作者： Ghasem-Aghaee, Nasser PoorMohamadBagher, Latifeh Kaedi, Marjan Ören, Tuncer I. University of Isfahan Department of Computer Engineering Isfahan Iran Beykent University Istanbul Turkey M and SNet: McLeod M and S Network of SCS SITE University of Ottawa Ottawa ON Canada

ISBN: (纸本)9780889866638

In this paper we have developed a fuzzy intelligent agent with a fuzzy emotional component. This component evaluates the degree of anger emotion which the intelligent agent may feel when it encounters to a persecuting event. For this purpose we have implemented a fuzzy inference system using Java environment and we have considered three parameters related on human anger emotion as the inputs of this system. The system outputs can be used in agent decision making process by combination this anger intensity to other emotion intensities and applies them for choosing a proper action from some available actions.

关键词： Intelligent agents

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Performance of MC-DS-CDMA systems employing chaotic binary sequences

Performance of MC-DS-CDMA systems employing chaotic binary s...

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2nd International Conference on Innovative Computing, Information and Control, ICICIC 2007

作者： Yoshioka, Daisaburo Tsuneda, Akio Department of Electronics and Computer Network Engineering Sojo University 4-22-1 Ikeda Kumamoto Japan Department of Graduate School of Science and Technology Kumamoto University 2-39-1 Kurokami Kumamoto Japan

ISBN: (纸本)0769528821

This paper studied the effect of chaos-based spreading sequences on the performance of asynchronous multi-carrier (MC) direct sequence (DS) code division multiple access (CDMA) systems. It is demonstrated that the performance of MC-DS-CDMA system employing chaotic binary sequences can be superior to that for conventional codes in terms of bit error probabilities. ©2007 IEEE.

关键词： Binary sequences

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IEEE radio communications - Components, systems, and networks

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IEEE COMMUNICATIONS MAGAZINE 2007年第9期45卷 38-38页

作者： Evans, Joseph Zvonar, Zoran Department of Electrical Engineering and Computer Science Research Information Technology University of Kansas Lawrence KS United States Division of Computer and Network Systems Department for Computer and Information Science and Engineering National Science Foundation United States Systems Engineering Group RF and Wireless System Business Unit Analog Devices

No abstract available

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Design principles and formulation for optical smart networks

Design principles and formulation for optical smart networks

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Military Communications Conference, MILCOM 2007

作者： Zhang, Tao Lu, Kejie Xiao, Gaoxi Zheng, S.-Q. School of Engineering and Computing Sciences New York Institute of Technology Old Westbury NY 11568 United States Department of Electrical and Computer Engineering University of Puerto Rico at Mayagüez Mayagüez 00681 Puerto Rico Network Technology Research Centre School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States

ISBN: (纸本)1424415136

Optical SMART (Scalable Multi-Access Reconfigurable Transport) network [J] is an emerging optical networking paradigm that can effectively provide connectivity based on the hypergraph theory. Similar to a conventional graph, which consists of a set of edges, a hypergraph consists of a set of hyperedges (or hyperchannels), each of which can connect two or more nodes and can support communications amongst the nodes inside the hyperchannel. To enable hyperchannel in optical SMART networks, we have designed a hybrid node architecture in our previous study [IJ. In this paper, we explore the network design principles and formulation for optical SMART networks. In particular, we formulate the static hyperchannel establishment problem as a Mixed Integer Linear Program (MILP), where the set of possible hyperchannels is given. © 2007 IEEE.

关键词： Integer programming

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CPU vs. NIC one to one correspondence method for improving parallel processing performance in a small-way SMP cluster

CPU vs. NIC one to one correspondence method for improving p...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Takafumi Fukunaga Hidenori Umeno Tomoo Aoyama Department of Computer Network Engineering Kumamoto Prefectural College of Technology Kumamoto Japan Department of Computer Science and Electrical Engineering Kumamoto University Kumamoto Japan Department of Faculty of Engineering University of Miyazaki Japan

We have studied various methods for improving the performance of SMP clusters. Most of them are using special hardware, non standard protocols, so that need special added library and complex programming, tending to raise their cost and to spoil their flexibility. To solve their problems we propose a CPU vs. NIC one to one correspondence method for improving parallel processing performance in a PC cluster, using comparatively simple method where transmitting NICs are fixedly assigned to CPUs one to one. So that the communication load between PCs can be balanced. Applying this method to parallel processing in a dual PC cluster, and comparing this method with conventional ordinary ones, we have obtained better result for some benchmarks.

关键词： Parallel processing Switches Electronic mail Costs Bonding Scalability Hardware Protocols Linux Load management

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An Energy-Efficient Mechanism using CLMAC Protocol for Wireless Sensor networks

An Energy-Efficient Mechanism using CLMAC Protocol for Wirel...

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International Conference on networking and Services (ICNS)

作者： Jaejoon Cho Sungho Kim Heungwoo Nam Sunshin An Computer Network Laboratory Department Of Electronics Engineering Korea University Seoul South Korea

ISBN: (纸本)9781424431526;9780769525588

Energy efficiency is a key issue because most wireless sensor networks use battery-oriented computing and sensing devices. A network of these devices will collaborate for a common application such as environment monitoring. Thus, energy-efficient MAC protocols have focused on minimizing idle listening time at sensor nodes. Recently, energy-efficient protocols such as S-MAC, B-MAC and EA-ALPL proposed to reduce energy consumption. Here, we propose a cross-layer mechanism called cross layer medium access control (CLMAC) protocol that designed for wireless sensor networks. To meet energy-efficient routing, the CLMAC includes routing distance in the preamble field of the B-MAC. Because the CLMAC unified network layer and link layer uses routing distance without big routing table, it enables nodes to reduce control traffic routing overhead. Also, the CLMAC makes it possible to extend the lifetime of the wireless sensor networks that contain a number of nodes. The analytical results show that CLMAC protocol reduces routing overhead of the sensor nodes in wireless sensor networks.

关键词： Energy efficiency Wireless application protocol Wireless sensor networks Routing Access protocols Media Access Protocol computer networks Collaboration Monitoring Energy consumption

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Separation of Duty in Role-Based Access Control Model through Fuzzy Relations

Separation of Duty in Role-Based Access Control Model throug...

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International Symposium on Information Assurance and Security (IAS)

作者： Hassan Takabi Morteza Amini Rasool Jalili Network Security Center Computer Engineering Department Sharif University of Technology Tehran Iran

As a security principle, separation of duty (SoD) is widely considered in computer security. In the role-based access control(RBAC) model, separation of duty constraints enforce conflict of interest policies. There are two main types of separation of duty policies in RBAC, Static SoD (SSoD) and Dynamic SoD (DSoD). In RBAC, Statically Mutually Exclusive Role (SMER) constraints are used to enforce Static Separation of Duty policies. Dynamic Separation of duty policies, like SSoD policies, are intended to limit the permissions that are available to a user. However, DSoD policies differ from SSoD policies by the context in which these limitations are imposed. A DSoD policy limits the availability of the permissions over a users permission space by placing constraints on the roles that can be activated within or across a users sessions. Like SMER, in RBAC Dynamically Mutually Exclusive Role (DMER) constraints are used to enforce DSoD policies. We investigated using of a fuzzy approach to address the issue in order to provide a more practical solution. In this paper, we propose a model to express the separation of duty policies in RBAC using the fuzzy set theory. The concept of trustworthiness, which is fuzzy in nature, is used to express this model. In comparison with non-fuzzy methods, our method is more pragmatic and more consistent with the real world. The expressiveness of our method is higher than the non- fuzzy ones. We show expression of some constraints in our method which cannot be expressed by non-fuzzy methods. Applicability of the method is shown through an example of the real world.

关键词： Access control Fuzzy control Permission computer security Information security Fuzzy set theory NIST computer networks computer errors

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Enhancing Role-Based Access Control Model through Fuzzy Relations

Enhancing Role-Based Access Control Model through Fuzzy Rela...

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International Symposium on Information Assurance and Security (IAS)

作者： Hassan Takabi Morteza Amini Rasool Jalili Network Security Center Computer Engineering Department Sharif University of Technology Tehran Iran

Role-Based Access Control (RBAC) model is naturally suitable to organizations where users are assigned organizational roles with well-defined privileges. However, due to the large number of users in nowadays online services of organizations and enterprises, assigning users to roles is a tiresome task and maintaining user-role assignment up- to-date is costly and error-prone. Additionally, with the increasing number of users, RBAC may have problems in prohibiting cheat and changing roles of users. In order to categorize information and formulate security policies, human decision making is required which is naturally fuzzy in the real world. This leads using a fuzzy approach to address the issue in order to provide a more practical solution. In this paper, applicability of fuzzy set theory to RBAC has been investigated by identifying access control building blocks which are fuzzy in essence. An existing RBAC model is extended to allow imprecise access control policies, using the concept of trustworthiness which is fuzzy in nature. We call the extended model as Fuzzy RBAC. Applicability of the extended model has been evaluated through some case studies.

关键词： Access control Fuzzy control Fuzzy set theory Information security Permission computer security computer networks Information technology Insurance Companies

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