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IEEE International Conference on Circuits and Systems for Communications (ICCSC)

作者： Dionysios Skordoulis Qiang Ni Geyong Min Kevin Borg Electronic & Computer Engineering Division School of Engineering and Design Brunei University West London UK Department of Computing School of Informatics University of Bradford Bradford UK

In this paper we investigate potential benefits that an adaptive delayed channel access algorithm can attain for the next-generation wireless LANs, the IEEE 802.11n. We show that the performance of frame aggregation introduced by the 802.11n adheres due to the priority mechanism of the legacy 802.11e EDCA scheduler, resulting in a poor overall performance. Because high priority flows have low channel utilization, the low priority flows throughputs can be amerced further. By introducing an additional delay at the MAC layer, before the channel access scheduling, it will retain aggregate sizes at higher numbers and consequently a better channel utilization. Also, in order to support both UDP and TCP transport layer protocols, the algorithm's operational conditions are kept adaptive. The simulation results demonstrate that our proposed adaptive delayed channel access outperforms significantly the current 802.1 In specification and non-adaptive delayed channel access.

关键词： Delay Throughput Telecommunication traffic Wireless LAN Design engineering Aggregates Access protocols Scheduling Quality of service Physical layer

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A Modeling Framework for Evaluating Effectiveness of Smart-Infrastructure Crises Management Systems

A Modeling Framework for Evaluating Effectiveness of Smart-I...

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IEEE Conference on Technologies for Homeland Security

作者： Tridib Mukherjee Sandeep K. S. Gupta Impact Laboratory Department of Computer Science and Engineering School of Computing & Informatics Arizona State University Tempe AZ USA

ISBN: (纸本)9781424419777

Crises management for smart-infrastructure - infused with sensors, actuators, and intelligent agent technologies for monitoring, access control, and crisis response - requires objective and quantitative evaluation to learn for future. The concept of criticality - characterizing the effect of crises on the inhabitants of smart-infrastructure - is used in this regard. This paper establishes a criticality response modeling (CRM) framework to perform quantitative evaluation of criticality response. The framework can further be incorporated in any criticality-aware middleware for smart-infrastructure. An established stochastic model for criticality response is used from our previous work. The effectiveness of criticality response is measured in terms of the Manageability metric, characterized by the Q-value or qualifiedness of the response actions. The CRM is applied to fire emergencies in an envisioned smart oil & gas production platforms (OGPP). A simulation based evaluation, using CRM over OGPP, show that high manageability is achieved with - i) fast criticality detection, ii) fast response actuation, and iii) non-obliviousness to any subsequent criticality during response actuation - verifying the applicability of Q-value as the manageability metric.

关键词： Crisis management Disaster management Technology management Intelligent sensors Sensor phenomena and characterization Intelligent actuators Intelligent agent Monitoring Access control Performance evaluation

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Position Statement: Advances and Challenges of Software engineering

Position Statement: Advances and Challenges of Software Engi...

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IEEE Annual International Computer Software and Applications Conference (COMPSAC)

作者： Stephen S. Yau Information Assurance Center Department of Computer Science and Engineering School of Computing and Informatics Ira A. Fulton School of Engineering Arizona State University Tempe AZ USA

In this article the advances in software engineering are i) evolvement of software processes from rigid, sequential and slow processes to iterative and agile processes and standardization of process models, such as CMMI (Capability Maturity Model Integration) and ISO 12207, ii) programming paradigms and software design techniques, such as object-oriented programming and model-driven architecture, iii) various techniques for software reuse, such as design patterns and component-based software development, iii) formal methods for software specification and verification, and numerous methods for software testing, iv) software architecture, such as event-driven architecture and service-oriented architecture, and architecture description languages. All these advances aim at improving the quality of software, reducing cost, and promoting software reuse.

关键词： Software Software engineering Programming Object oriented modeling Capability maturity model Computer architecture Internet

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Ontology-based protein-protein interactions extraction from literature using the Hidden Vector State model

Ontology-based protein-protein interactions extraction from ...

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IEEE International Conference on Data Mining Workshops, ICDM Workshops 2008

作者： He, Yulan Nakata, Keiichi Zhou, Deyu School of Engineering Computing and Mathematics University of Exeter North Park Road Exeter EX4 4QF United Kingdom Informatics Research Centre University of Reading Whiteknights Reading RG6 6BX United Kingdom

ISBN: (纸本)9780769535036

This paper proposes a novel framework of incorporating protein-protein interactions (PPI) ontology knowledge into PPI extraction from biomedical literature in order to address the emerging challenges of deep natural language understanding. It is built upon the existing work on relation extraction using the Hidden Vector State (HVS) model. The HVS model belongs to the category of statistical learning methods. It can be trained directly from un-annotated data in a constrained way whilst at the same time being able to capture the underlying named entity relationships. However, it is difficult to incorporate background knowledge or non-local information into the HVS model. This paper proposes to represent the HVS model as a conditionally trained undirected graphical model in which non-local features derived from PPI ontology through inference would be easily incorporated. The seamless fusion of ontology inference with statistical learning produces a new paradigm to information extraction. © 2008 IEEE.

关键词： Ontology

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The importance of biometric sensor continuous secure monitoring

The importance of biometric sensor continuous secure monitor...

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3rd International Conference on Digital Information Management, ICDIM 2008

作者： Papanikolaou, Alexandros Georgiadis, Georgiadis Ilioudis, Christos Pimenidis, Elias Dept. of Computer and Communication Engineering University of Thessaly Volos Greece Dept. of Applied Informatics University of Macedonia Thessaloniki Greece Dept. of Information Technology Technical Educational Institute of Thessaloniki Greece School of Computing and Technology University of East London United Kingdom

ISBN: (纸本)9781424429172

The security of a biometric information system depends partially on the ability of the biometric information sensor to authenticate itself securely to the processing centre it usually interacts with, thus ensuring that the securely transmitted biometric data has not been constructed by an attacker. The biometric sensors of a biometric information system are often physically exposed to potential adversaries who may manipulate them and therefore compromise the security of the system. Such attacks can be detected by continuous and secure sensor monitoring. The proposed scheme is based on the Kerberos protocol for dealing with sensor authentication issues. Using authenticated control/data packets its functionality has been extended to provide secure sensor monitoring, which can help in detecting physical attacks on the sensor itself. © 2008 IEEE.

关键词： Information systems

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Proposing a hybrid-intelligent framework to secure e-Government web applications 08

Proposing a hybrid-intelligent framework to secure e-Governm...

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2nd International Conference on Theory and Practice of Electronic Governance, ICEGOV'08

作者： Moosa, Asaad Alsaffar, Eanas Muhsen Centre for Advanced Computing and Emerging Technologies School of Systems Engineering University of Reading 44 New Road Reading Berkshire RG1 5JD United Kingdom Informatics Research Group School of Systems Engineering University of Reading Whiteknights P.O. Box 217 RG6 6AH Reading Berkshire United Kingdom

ISBN: (纸本)9781605583860

One of the essential needs to implement a successful e-Government web application is security. Web application firewalls (WAF) are the most important tool to secure web applications against the increasing number of web application attacks nowadays. WAFs work in different modes depending on the web traffic filtering approach used, such as positive security mode, negative security mode, session-based mode, or mixed modes. The proposed WAF, which is called (HiWAF), is a web application firewall that works in three modes: positive, negative and session based security modes. The new approach that distinguishes this WAF among other WAFs is that it utilizes the concepts of Artificial Intelligence (AI) instead of regular expressions or other traditional pattern matching techniques as its filtering engine. Both artificial neural networks and fuzzy logic concepts will be used to implement a hybrid intelligent web application firewall that works in three security modes. Copyright 2008 ACM.

关键词： Computer circuits

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Performance evaluation of IEEE 802.1x authentication methods and recommended usage

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WSEAS Transactions on Communications 2008年第3期7卷 133-143页

作者： Akhlaq, Monis Aslam, Baber Khan, Muzammil A. Mellor, John Jafri, M. Noman Awan, Irfan Mobile Computing Networks and Security Research Group School of Informatics University of Bradford Bradford BD7 1DP United Kingdom Computer Science Department School of Electrical Engg. and Computer Science University of Central Florida Orlando FL 32816 United States Information Security Department College of Signals National University of Science and Technology Tamizuddin Road Rawalpindi Pakistan Electrical Engineering Department College of Signals National University of Science and Technology Tamizuddin Road Rawalpindi Pakistan

The wide spread acceptance of IEEE WLANs is a result of industrial standardization to ensure product compatibility and reliability among various manufacturers. Several WLANs solutions are available with varying characteristics and interoperability. The IEEE Standard 802.11 is one of the most widely adopted mechanisms for wireless LANs. It defines both physical (PHY) and medium access control (MAC) layer protocol however;it provides limited data confidentiality and has cumbersome procedure for key exchange. In response IEEE introduced a port based network access control standard 802.1x to authenticate and authorize devices interconnected various IEEE 802 LANs. 802.1x only defines authentication not the actual authentication method which allows the developers to construct their own algorithm and consequently a lot of wireless vendors implemented their own 802.1x adaptation such as MD5 Message Digest 5, TLS (Transport Layer Security), TTLS (Tunneled TLS), PEAP (Protected Extensible Authentication Protocol), LEAP (Lightweight Extensible Authentication Protocol) and others. This versatility in 802.1x adaptations has made it difficult for the WLANs users to choose an appropriate mechanism in relation to performance and security of networks. An effort has been made in [1] to carry out comparative analysis of IEEE authentication methods in different security combinations. This work supplements the efforts cited in [1] and incorporates more results in added network configurations. The paper finally recommends the users an appropriate IEEE authentication methods depending upon the need, requirements and security concerns.

关键词： Authentication

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Enhancing an application server to support available components

Enhancing an application server to support available compone...

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作者： Kistijantoro, Achmad Imam Morgan, Graham Shrivastava, Santosh K. Little, Mark C. School of Electrical Engineering and Informatics Bandung Institute of Technology ITB Ganesha 10 Bandung 40135 Indonesia School of Computing Science Newcastle University Claremont Tower NE1 7RU United Kingdom Red Hat UK Ltd. 107-111 peascod Street Windsor Berkshire SI4 1TE United Kingdom

Three-tier middleware architecture is commonly used for hosting enterprise distributed applications. Typically the application is decomposed into three layers: front-end, middle tier and back-end. Front-end ('Web server') is responsible for handling user interactions and acts as a client of the middle tier, while back-end provides storage facilities for applications. Middle tier ('Application server') is usually the place where all computations are performed. The benefit of this architecture is that it allows flexible management of a cluster of computers for performance and scalability;further, availability measures, such as replication, can be introduced in each tier in an application specific manner. However, incorporation of availability measures in a multi-tier system poses challenging system design problems of integrating open, non proprietary solutions to transparent failover, exactly once execution of client requests, non-blocking transaction processing and an ability to work with clusters. This paper describes how replication for availability can be incorporated within the middle and back-end tiers meeting all these challenges. The paper develops an approach that requires enhancements to the middle tier only for supporting replication of both the middleware backend tiers. The design, implementation and performance evaluation of such a middle are presented. © 2008 IEEE.

关键词： Fault tolerance

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A Race Condition Graph for Concurrent Program Behavior

A Race Condition Graph for Concurrent Program Behavior

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2008 3rd International Conference on Intelligent System and Knowledge engineering(第三届智能系统与知识工程国际会议)(ISKE 2008)

作者： Yan Chen Donghui Guo Yann-Hang Lee W.Eric Wong The School of Information Science and Technology Xiamen UniversityChina. The School of Computing and Informatics Arizona State UniversityU.S.A. The School of Engineering and Computer Science University of Texas at DallasU.S.A.

There are race conditions in concurrent programsif the accesses to a sharing resource are not properlysynchronized Because the races can cause theprogram to behave in unexpected ways,detectingthem is an important aspect of debugging andprogram *** approaches have beenused to detect race conditions,but there still is noeffective formal model to visualize the race conditionsand program *** this paper,we present aformal graph,named Race Condition Graph(RCG),to represent race conditions in concurrent *** characteristics of RCG are presented and thepotential RCG(PRCG)as well as the data structure isdiscussed Finally,a dining philosopher program isused as a case study.

关键词： Intelligent systems Knowledge engineering Data visualization Data structures Information science informatics Computer science Electronic mail Debugging Yarn

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Adaptive Medium Access Control for VoIP Services in IEEE 802.11 WLANs

Adaptive Medium Access Control for VoIP Services in IEEE 802...

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4th International Conference on Circuits and Systems for Communications (ICCSC 2008), vol.2

作者： Mamun I. Abu-Tair Geyong Min Qiang Ni Hong Liu Department of Computing School of Informatics University of Bradford Bradford UK Electronic & Computer Engineering Division School of Engineering and Design Brunei University West London UK Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology China

Voice over Internet Protocol (VoIP) is an important service with strict Quality-of-Service (QoS) requirements in Wireless Local Area Networks (WLANs). The popular Distributed Coordination Function (DCF) of IEEE 802.11 Medium Access Control (MAC) protocol adopts a Binary Exponential Back-off (BEB) procedure to reduce the packet collision probability in WLANs. In DCF, the size of contention window is doubled upon a collision regardless of the network loads. This paper presents an adaptive MAC scheme to improve the QoS of VoIP in WLANs. This scheme applies a threshold of the collision rate to switch between two different functions for increasing the size of contention window based on the status of network loads. The performance of this scheme is investigated and compared to the original DCF using the network simulator NS-2. The performance results reveal that the adaptive scheme is able to achieve the higher throughput and medium utilization as well as lower access delay and packet loss probability than the original DCF.

关键词： Programmable control Adaptive control Media Access Protocol Switches Internet telephony Quality of service Wireless LAN Access protocols Performance loss Throughput

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