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

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology (FIT) Fukuoka Japan Department of Information and Communication Engineering Fakuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology (FIT) Higashi-Ku Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Indiana University Perdue University Indianapolis Indianapolis IN USA Department of Computer Science and Information Engineering Tokyo Denki University Hatoyama Saitama Japan Department of Computers and System Engineering Tokyo Denki University Saitama Japan

In this paper, we present the design and implementation of the JXTA-based e-Learning P2P system. We also show the design and implementation of a smart box environment that will be used for stimulating the learners to increase the learning efficiency. The smart box is intended to be integrated with our P2P system as a useful tool for monitoring and controlling learners' activity. Finally, it is also useful to evaluate the feasibility of our P2P platform to integrate different computational devices.

关键词： Electronic learning Monitoring Control systems

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Implementation and Design of New Functions for a Web-Based E-learning system to Stimulate Learners Motivation

Implementation and Design of New Functions for a Web-Based E...

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International Conference on Complex, Intelligent and Software Intensive systems, CISIS

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering FIT Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Computers and System Engineering Tokyo Denki University Hatoyama Saitama Japan

Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is low. One of the reasons is the low study desire and motivation. In our previous work, we implemented a e-learning system that is able to increase the learning efficiency by stimulating learners motivation. In this work, we designed and implemented new functions to improve the system performance.

关键词： Electronic learning Electronic mail Materials Distance learning computers History Cellular phones

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A Secure Web Services Model Based on the Combination of SOAP Registration Info and Token Proxy

A Secure Web Services Model Based on the Combination of SOAP...

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International Symposium on computer Science and Computational Technology, ISCSCT

作者： Youxiang Duan Yongtang Bao Lijiang Pan Beibei Yan Jiuyun Xun Nianyun Shi Department of Computer and Communication Engineering China University of Petroleum Dongying China Dept of Computer and Communication Engineering China University of Petroleum (East China) Dongying China Department of Marketing Management The institute of Architecture Designing of Dongying Dongying China Finance Bureau Information Center of Dongying China University of Petroleum (East China) Dongying China Finance Bureau Information Center of Dongying China University of Petroleum Dongying China Dept. of Marketing Management institute of Architecture Designing of Dongying Dongying China Institute Network Information and System China University of Petroleum (East China) Dongying China Institute Network Information and System China University of Petroleum Dongying China

Along with the thorough development and application for Web services, the security of it has taken people¿s attention more and more. While Web services security (WSS) can exchange safe SOAP message and enhance the security of Web services, it will also have certain influence to the performance of Web services. In order to satisfy the security of it , to reduce the performance influence of Web services and to solve both the requester and provider side cannot recognize the security token, in this paper, we aim at proposing a SOAP information registration and security token proxy model for Web services (SIRSTPM). We has carried on the formalizing and verifying of this model. The result of theoretical verification shows this model is secure and effective. This model is helpful for solving the problem between security and performance contradiction as well as the token cannot be recognized by both the requester and the provider.

关键词： Web services Simple object access protocol Information security Petroleum computer networks Service oriented architecture communication system security computer science Design engineering Finance

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An Intelligent Handoff system for Wireless Cellular Networks Using Fuzzy Logic and Random Walk Model

An Intelligent Handoff System for Wireless Cellular Networks...

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2nd International Conference on Complex, Intelligent and Software Intensive systems (CISIS 2008)

作者： Leonard Barolli Fatos Xhafa Arjan Durresi Akio Koyama Makoto Takizawa Department of Information and Communication Engineering Fukuoka Institute of Technology Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Informatics Yamagata University Yonezawa Japan Department of Computer and System Engineering Tokyo Denki University Hatoyama Saitama Japan

In mobile cellular systems the handover is a very important process to maintain the desired Quality of Service (QoS). Many handover algorithms are proposed in the literature. However, to make a better handover and keep the QoS in wireless networks is very difficult. In this paper, by using random walk model and fuzzy theory we propose a new handover system. The proposed system uses 3 parameters for handoff decision: signal strength from the present Base Station (BS), signal strength from the neighbor BS, and the distance between Mobile Station (MS) and BS. The performance evaluation via simulations shows that proposed system can avoid ping-pong effect and has a good handover decision.

关键词： Distance measurement Layout Electric fields Fault currents Circuit faults Artificial intelligence High definition video

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Combined CDMA -SDMA performance analysis and code assignment algorithm

Combined CDMA -SDMA performance analysis and code assignment...

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ICICT 2007: International Conference on Information and communication Technology

作者： Odeh, Nidhai Khatun, Sabira Ali, Borhanuddin Mohd Ismail, Alyani Department of Computer and Communication System Engineering Faculty of Engineering University Putra Malaysia Malaysia

ISBN: (纸本)9843233948

This paper present a novel performance enhancement for combined Code Division Multiple Access (CDMA) and Space Division Multiple Access (SDMA) scheme using SDMA grouping on top of code and spatial signatures. This paper is divided into two parts. In the first part, the system performance of combined CDMA- SDMA scheme is evaluated under Additive White Gaussian Noise (AWGN) channel for a single sectored cell. A fixed number of available codes L kept in a central pool can be utilized by K users, where, K>L. The same code can be assigned to a group of users according to their Angle of Arrival (which is known as SDMA group). Here, the analytical model of Bit Error Rate (BER) for any arbitrary number of users has been derived and evaluated. In the second part of this paper, a simple code assignment algorithm is proposed to assign a already used code to a new user by which, the orthogonality between users can be maximized. The results show that the system capacity is noticeably improved with the combined system compared to the pure CDMA system. Further enhancement can be obtained when SDMA grouping is considered with orthogonal code assignment to users those belongs to different SDMA groups. Finally, the code assignment algorithm shows that high number of users can be accommodated by a fixed small number of codes.

关键词： Code division multiple access

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Hybrid SCM SAC-OCDMA system employing new optical spectral amplitude direct decoding detection technique

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Journal of Applied Sciences 2007年第14期7卷 1942-1947页

作者： Sahbudin, R.K.Z. Abdullah, M.K. Samad, M.D.A. Mahdi, M.A. Ismail, M. Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Department of Electrical Electronics and Systems Faculty of Engineering Universiti Kebangsaan Malaysia Selangor Malaysia

In this research, a hybrid subcarrier multiplexed spectral-amplitude-coding optical code-division-multiple-access (SCM SAC-OCDMA) system is proposed for the purpose of combining the advantages of both techniques. SAC-OCDMA is employed because of its ability to eliminate the Multiple Access Interference (MAI) when code sequences with fixed in-phase cross correlation are used. In order to enhance the channel data rate of the OCDMA systems, the SCM technique is used. As a result, the hybrid system is robust against interference and is much more spectrally efficient. The system utilizes double weight (DW) code that has a weight W equal to two, code length N equal to six and cross correlation λ equal to 1. A simple and new detection technique called optical spectral amplitude direct decoding is proposed. Based on the theory and experimental simulation results obtained, the new proposed detection technique provides a better performance than the conventional balanced detection technique. © 2007 Asian Network for Scientific Information.

关键词： Decoding

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Low-voltage, low-power fully differential folded cascode OTA utilized in sample and hold stage of pipelined ADC

Low-voltage, low-power fully differential folded cascode OTA...

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4th International Conference on Cybernetics and Information Technologies, systems and Applications/5th Int Conf on Computing, communications and Control Technologies

作者： Jamuar, S. S. Meaamar, Ali Alihasan, Wael A. Y. Mahdi, Mohd. Adzir B. Department of Electrical and Electronic Engineering Faculty of Engineering University Putra Malaysia (UPM) Malaysia Department of Computer and Communication System Engineering Faculty of Engineering University Putra Malaysia (UPM) Malaysia

ISBN: (纸本)9781934272244

A fully differential, high gain opamp to be used in a low-voltage low-power high speed pipeline ADC in a 0.18 mu m CMOS process is designed. The opamp architecture is based on folded cascode and "double differential amplifier" technique. This design operates of a 1.8V power supply, achieving a differential output swing of +/-1.65V, a DC gain of > 95 dB with a unity gain at 312MHz and a phase margin of 56 degrees and 0.5mW power dissipation. The opamp can be used to design high-speed ADCs, for local wireless communications. The minimized power dissipation opamp could be used in high resolution, high speed pipelined analog to digital converters, which are needed in applications requiring both high data rate and high speed, such as wireless LANs.

关键词： analog-to-digital converter OTA folded cascode differential amplifier

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Micromachined W-band integrated rectangular waveguide filter utilising SU-8

Micromachined W-band integrated rectangular waveguide filter...

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Asia-Pacific Microwave Conference, APMC 2007

作者： Ismail, A. Razalli, M.S. Mahdi, M.A. Darman, W.N.I. Wan Abdullah, R.S.A Raja Isa, M.M. Department of Computer and Communication System Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Department of Electrical and Electronic Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

ISBN: (纸本)1424407494

This paper is a study on the design of microwave waveguide filter suitable for micromachining process. Novel structure and processes are introduced which allow accurate fabrication of low loss waveguide filter. This new technique applies micro-fabrication processes to improve fabrication accuracy. A W-band micromachined rectangular waveguide filter utilizing SU-8 micromachining with CPW input and output ports has been designed. Simulated frequency responses exhibit insertion loss of 1.18 dB across 1 GHz bandwidth for W-band frequency range centered at 93 GHz with return loss better than -20 dB.

关键词： Waveguide filters

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Combined CDMA-SDMA Performance Analysis and Code Assignment Algorithm

Combined CDMA-SDMA Performance Analysis and Code Assignment ...

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International Conference on Information and communication Technologies (ICICT)

作者： Nidhal Odeh Sabira Khatun Borhanuddin MohdAli Alyani Ismail Department of Computer and Communication System Engineering University Putra Malaysia Malaysia

This paper present a novel performance enhancement for combined code division multiple access (CDMA) and space division multiple access (SDMA) scheme using SDMA grouping on top of code and spatial signatures. This paper is divided into two parts. In the first part, the system performance of combined CDMA-SDMA scheme is evaluated under Additive White Gaussian Noise (AWGN) channel for a single sectored cell. A fixed number of available codes L kept in a central pool can be utilized by K users, where, K>L. The same code can be assigned to a group of users according to their angle of arrival (which is known as SDMA group). Here, the analytical model of bit error rate (BER) for any arbitrary number of users has been derived and evaluated. In the second part of this paper, a simple code assignment algorithm is proposed to assign a already used code to a new user by which, the orthogonality between users can be maximized. The results show that the system capacity is noticeably improved with the combined system compared to the pure CDMA system. Further enhancement can be obtained when SDMA grouping is considered with orthogonal code assignment to users those belongs to different SDMA groups. Finally, the code assignment algorithm shows that high number of users can be accommodated by a fixed small number of codes.

关键词： Performance analysis Multiaccess communication Multiple access interference system performance AWGN Bit error rate communications technology systems engineering and theory Electronic mail Additive white noise

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The performance evaluation of combined CDMA-SDMA multi-user detection with parallel interference cancellation

The performance evaluation of combined CDMA-SDMA multi-user ...

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： Nidhal Odeh Sabira Khatun Borhanuddin Mohd Ali Alyani Ismail Chee Kyun Ng Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia MIMOS Malaysia

ISBN: (纸本)9781424407781

This paper describes a novel performance evaluation technique of combined Code Division Multiple Access (CDMA) and Space Division Multiple Access (SDMA) multiuser receiver. The receiver detects users based on their code and spatial signatures. Exact calculation of the MAI interference is considered in this paper for a single sector cell that adopts combined CDMA-SDMA system, and accommodates an arbitrary K number of users transmitting their data. The Bit Error Rate (BER) expressions of any arbitrary user have been derived. Parallel Interference Canceller (PIC) is adopted as a suboptimum multiuser detector. Comparison between the performance of a CDMA system and Combined CDMA-SDMA system with and without PIC receivers are investigated. Our results show that the BER of a system with PIC is noticeably improved compared to the one without PIC (conventional multiuser receiver). Finally, the combined system enhances the system capacity by means of improving the BER performance.

关键词： Multiuser detection Interference cancellation Multiaccess communication Bit error rate Multiple access interference Performance gain Wireless communication Gaussian approximation Frequency division multiaccess Time division multiple access

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