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作者： Rastegari, Samaneh Saripan, M. Iqbal Rasid, Mohd Fadlee A. Department of Computer and Communication System Engineering Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

ISBN: (纸本)9789881701299

Domain Name system (DNS) provides name to address mapping services for the entire chain of Internet connectivity. Hackers exploit this fact to damage different parts of the Internet. In this paper we clarify possible Denial of Service (DoS) threats against DNS. An Intrusion Detection system (IDS) is introduced is the system to detect and classify different types of DoS attacks against DNS. This system consists of a statistical preprocessor and a machine learning (ML) engine. Three different types of neural network classifiers and support vector machines are evaluated in a simulated network. The results show that a backpropagation neural network engine outperforms other types of classifiers with 99% accuracy.

关键词： Neural networks

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Two-photon photoluminescence induced defects on InGaN crystal and light emitting diodes

Two-photon photoluminescence induced defects on InGaN crysta...

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2010 1st International Conference on Photonics, ICP2010

作者： Noor, A.S.M. Abidin, M.S.Z. Kawata, Y. Department of Computer and Communication System Engineering Faculty of Engineering Wireless and Photonics Network Centre of Excellence 43400 UPM Serdang Selangor Malaysia Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Department of Mechanical Engineering Shizuoka University Johoku Hamamatsu 432-8018 Japan

ISBN: (纸本)9781424471874

Two-photon excitation techniques used in fabricating lines defects were done on a light emitting diode chip. Simultaneous detection of a quenched wide-gap semiconductor crystal has been observed using single- and two-photon photoluminescence. It was found at the quenched area, single-photon excitation gives photoluminescence read-out compared to two-photon excitation which no photoluminescence detected at the bandgap wavelength. This is due to the excitation states which the transition of electron for two-photon excitation to occur have been demolished by the annealing of the sample which involved two-photon quenching process. The dependency of excitation power with respective photoluminescence is elaborated to confirmed the single- and two-photon excitation photoluminescence methods Â© 2010 IEEE.

关键词： Photoluminescence

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Using CAPTCHAs to mitigate the VoIP spam problem

Using CAPTCHAs to mitigate the VoIP spam problem

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2nd International Conference on computer Research and Development, ICCRD 2010

作者： Ahmedy, Ismail Portmann, Marius Department of Computer System and Communication Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia School of Information Technology and Electrical Engineering University of Queensland Queensland Australia

ISBN: (纸本)9780769540436

Voice over Internet Protocol (VoIP) is one of the emerging technologies today. This application offers the user a service by which one can call another person at a low cost as compare with traditional phone services. One drawback to the Internet is spam, which are unsolicited or unwanted objects which often appear as unwanted messages in various email applications. For VoIP, spam refers to unsolicited and unwanted calls by the VoIP user. In this paper, we have purposed a solution to prevent the spam in VoIP. The CAPTCHA (Completely Automated Public Turing Test to Tell computers and Human Apart) method aims to determine whether the call is coming from a human or a machine. The key contribution of this paper is a proof-of-concept implementation of a CAPTCHA mechanism to prevent VoIP Spam. © 2010 IEEE.

关键词： Electronic mail filters

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A LOCAL DYNAMIC CLUSTER SELF-ORGANIZATION ALGORITHM IN WIRELESS SENSOR NETWORKS FOR RAINFALL MONITORING

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Journal of Electronics(China) 2010年第2期27卷 279-288页

作者： Wang Huibin Xu Lizhong Xiao Xianjian Fan Tanghuai Xu Feng College of Computer ＆ Information Hohai University Nanjing 2100P8 China Institute of Communication ＆ Info System Engineering Hohai University Nanjing 210098 China Department of Computer Science ＆ Technology Nanchang Institute of Technology Nanchang 330099 China

Wireless Sensor Networks for Rainfall Monitoring (RM-WSNs) is a sensor network for the large-scale regional and moving rainfall monitoring,which could be controlled deployment. Delivery delay and cross-cluster calculation leads to information inaccuracy by the existing dynamic collabo-rative self-organization algorithm in WSNs. In this letter,a Local Dynamic Cluster Self-organization algorithm (LDCS) is proposed for the large-scale regional and moving target monitoring in RM-WSNs. The algorithm utilizes the resource-rich node in WSNs as the cluster head,which processes target information obtained by sensor nodes in cluster. The cluster head shifts with the target moving in chance and re-groups a new cluster. The target information acquisition is limited in the dynamic cluster,which can reduce information across-clusters transfer delay and improve the real-time of information acquisition. The simulation results show that,LDCS can not only relieve the problem of "too frequent leader switches" in IDSQ,also make full use of the history monitoring information of target and con-tinuous monitoring of sensor nodes that failed in DCS.

关键词： Wireless Sensor Networks (WSNs) Rainfall Monitoring (RM) Self-organization Local dynamic cluster

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Defending denial of service attacks against domain name system with machine learning techniques

IAENG International Journal of Computer Science

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IAENG International Journal of computer Science 2010年第4期37卷

作者： Rastegari, Samaneh Iqbal Saripan, M. Rasid, Mohd Fadlee A. Department of Computer and Communication System Engineering Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

Along with the explosive growth of the Internet, the demand for efficient and secure Internet Infrastructure has been increasing. For the entire chain of Internet connectivity the Domain Name system (DNS) provides name to address mapping services. Hackers exploit this fact to damage different parts of Internet. This paper focuses on Denial of Service (DoS) attacks as the major security issue during recent years. The process of detection and classification of DoS against DNS has been presented in two phases in our model. The proposed system architecture consists of a statistical pre-processor and a machine learning engine. Three different types of neural network classifiers and support vector machines are evaluated as the engine in a simulated network. The performance of our system was measured in terms of detection rate, accuracy, and false alarm rate. The results indicated that a back propagation neural network provides a 99% accuracy and an acceptable false alarm rate of 0.28% comparing to other types of classifiers.

关键词： Network security

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Investigation of electrical potential and electromagnetic field for overhead high voltage power lines in Malaysia

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Journal of Applied Sciences 2010年第22期10卷 2862-2868页

作者： Sahbudin, R.K.Z. Fauzi, S.A. Hitam, S. Mokhtar, M. Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

The exposure of human body to electric field and magnetic field could cause biological effects, including changes in functions of cells and tissues and subtle changes in hormone levels, which may or may not be harmful. The aim of this study was to analyze and compute the amount of electrical potential, electric field and magnetic flux density at a certain point and distance from the overhead high voltage power lines of 132 and 275 kV in Malaysia. An analytical calculus method is proposed in order to accomplish this study. The models of the power lines were constructed using the actual physical dimensions of the towers. The results show that the exposure levels of the electromagnetic fields to the public is low if they stay more than 30 m away from the power lines. For the live-line worker, the exposure to the high electric and magnetic field could endanger their body if they stay too close to the conductor. The evaluations of the electrical potential, electric field strength and magnetic flux density are done using the Matlab environment. Matlab's Graphical User Interface (GUI) techniques are developed as an easy and user-friendly tool to be used. © 2010 Asian Network for Scientific Information.

关键词： Magnetic flux

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The S.H.E.L.L. project: A Secure Habitat for an Enhanced Long Living - Design, implementation and guidelines for a new concept of people assistance

The S.H.E.L.L. project: A Secure Habitat for an Enhanced Lon...

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2010 3rd International Symposium on Applied Sciences in Biomedical and communication Technologies, ISABEL 2010

作者： Mastrogiovanni, Fulvio Bagnasco, Andrea Allasia, Giorgio Giuni, Antonella Dept. of Computer Communication and System Sciences University of Genova Genoa Italy Department of Biophysical and Electronics Engineering University of Genoa Genoa Italy FOS Srl Genoa Italy Genova Robot Srl Genoa Italy

ISBN: (纸本)9781424481323

The SHELL project aims at implementing state of art technologies in the domains of Wireless Sensor Networks, Ambient Intelligence, Context Awareness, Automated Learning, in order to design a new concept for assisting people affected by mental diseases or living alone. The goal to achieve is a modular device kit system, easy to deploy and to use, which will be able to learn to peculiar habits of the people under monitoring in order to improve the level of automatic alarms. ©2010 IEEE.

关键词： Wireless sensor networks

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Heart sound musical transcription technique using multi-level preparation

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International Review on computers and Software 2010年第6期5卷 595-600页

作者： Arvin, Farshad Doraisamy, Shyamala Department of Computer and Communication System Engineering University of Putra Malaysia Malaysia Malaysia Imperial College London United Kingdom

Musical transcription of heart sound is a new idea to provide a textual biomedical database. Textual database allows applying several indexing and searching techniques in order to monitor patient behavior for a long duration. MIDI commands produce a semi-structural musical file format which enables to apply various applications. Main objective of this paper is the extraction of fundamental frequency of the given heart sound which is recorded with an electrical stethoscope. Based on extracted fundamental frequencies, the logarithmical relationship of pitch numbers will be estimated. Generally the captured heart sound includes several types of noises such as other organs sound and ambient voice. Hence, filtering of the heart sound is indispensable. Thus, three levels of preparation techniques which are wavelet transform, frequency limitation, and amplitude reconstruction will be applied on the heart sound sequentially. The results of the performed experiments show the accuracy of approximately 93% ±2. The statistical analyses illustrated that each level of the preparation, significantly improved the accuracy of the transcription (p

关键词： Transcription

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A novel relaying protocol in a cooperative network with decode-and-forward relays

A novel relaying protocol in a cooperative network with deco...

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International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Sara Efazati Paeiz Azmi Communication System Laboratory(CSL) Department of Electrical and Computer Engineering Tarbiat Moalem University Iran

ISBN: (纸本)9781424456062;9789746724913

Cooperative diversity techniques make a reduction in spectral efficiency despite of an increase in reliability. In this paper we propose a novel relaying protocol in a cooperative network with decode and forward (DF) relays to improve the spectral efficiency in addition to achieving full diversity order (maximum available reliability). The proposed protocol keeps the transmission rate fixed to the rate of point-to-point transmission and outperforms rather than conventional relaying protocols such as fixed, selection and incremental relaying protocols. The simulation results show the effectiveness of our method and confirm our claim.

关键词： Protocols Decoding Digital relays Detectors Transmitting antennas Maximum likelihood detection Feedback Fading Wireless communication Performance gain

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Coordinated micro-generation and load management for energy saving policies

Coordinated micro-generation and load management for energy ...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： S. Bertolini M. Giacomini S. Grillo S. Massucco F. Silvestro Department of Communication Computer and System Sciences University of Genoa Italy Electrical Engineering Department University of Genoa Italy

The paper describes a joint university-industry project aimed at defining hardware and software requirements for the development of a prototypical microgrid platform on existing sites able to manage generation resources and load. The paper describes an architecture developed for integrating existing software tools for on-line load monitoring and control and for management of in-site generation. The system acquires data from field and stores information on a server, from which an optimization tool gets data in order to perform its calculations and give the optimal set points to the programmable generation resources. Results are reported about experimentation at test sites with different generating units, such as cogeneration of heat and power (CHP) and/or renewable power generating units equipped with a real-time monitoring tool.

关键词： Optimization Monitoring Generators computer architecture Cogeneration Energy consumption Sensors

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