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Business processes and support systems: Design for flexibility

Software Process Improvement and Practice 2007年第1期12卷 3-5页

作者： Green, Stewart Regev, Gil Soffer, Pnina Zdravkovic, Jelena Faculty of Computing Engineering and Mathematical Sciences University of the West of England Bristol United Kingdom School of Computer and Communication Sciences CH-1015 Lausanne Switzerland MIS Department Haifa University Carmel Mountain 31905 Haifa Israel Department of Computer Science Royal University of Technology Stockholm Sweden

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MoM analysis of dipole antennas in crosshole borehole radar and field experiments

MoM analysis of dipole antennas in crosshole borehole radar ...

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作者： Ebihara, Satoshi Hashimoto, Yuuki IEEE Department of Electronic Engineering and Computer Science Faculty of Engineering Osaka Electro-Communication University Osaka 572-8530 Japan Sanko Air Conditioning Company Ltd. Osaka 530-0047 Japan

In this paper, we propose a method-of-moments (MoM) analysis that includes the borehole effects on crosshole borehole radar, and we verify that the MoM represents the crosshole borehole radar data correctly. We derive the far-field approximation of an electric field radiated by an electric point source. In this derivation, we assume that the point source is in a cylindrically layered medium, while the observed electric field is in another cylindrically layered medium. The equations that are derived are used as a transfer function to connect the two impedance matrices-one for the transmitting antenna and the other one for the receiving one. In these matrices, the influence of the scattered field by the borehole is included completely. We conducted field experiments in granite with a controlled borehole medium in order to investigate the influence of the borehole. In this paper, we estimated the relative amplitude and the group delay of the received signals between the water-filled borehole case and the air-filled borehole case. This paper showed that the estimated amplitude and delay depend on the frequency and that the proposed MoM could predict these frequency dependencies. © 2007 IEEE.

关键词： Optical radar

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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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Ionospheric GPS-TEC during the 2004 major storm events at Scott Base station Antarctica

Ionospheric GPS-TEC during the 2004 major storm events at Sc...

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2007 IEEE International Conference on Telecommunications and Malaysia International Conference on communications, ICT-MICC 2007

作者： Sulaiman, Sumazly Ali, Mohd Alauddin Mohd Yatim, Baharudin Computer Science Department Universiti Malaysia Terengganu Kuala Terengganu Malaysia Electrical Electronic and System Department Faculty of Engineering Universiti Kebangsaan Malaysia Institute of Space Sciences Universiti Kebangsaan Malaysia

ISBN: (纸本)1424410940

In this work, we investigate the characteristics of the 2004 major storm events based on GPS-TEC measurement at Scott Base station Antarctica (77.9S, 166.8E). The F2 layer critical frequencies and peak height during the storm from the ionosonde measurement at the station are also investigated. Our main emphasis will be on the characteristics and response during major storms events. Our results will include the daily GPS-TEC and F2 layer critical frequencies and peak height from KEL IPS-42 ionosonde measurements at Scott Base Station. For the year 2004, 4 storm days are classified as major storms, which have occurred on 27th July 2004, referred to as Storm-A and on 8th to 10th November 2004 referred to as Storm-B. The World Data Center (WDC) Kp, Dst, and Ap highest indices for Storm-A is 9, -197 nT, and 162 respectively while for Storm-B is 9, -373 nT, and 189 respectively. The response of the ionosphere will provide us some indicators of the processes and geophysical changes of the Sun-Heliospheric system during the intense geomagnetic storm period. ©2007 IEEE.

关键词： Storms

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Enhanced random testing for programs with high dimensional input domains

Enhanced random testing for programs with high dimensional i...

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19th International Conference on Software engineering and Knowledge engineering, SEKE 2007

作者： Kuo, F.-C. Sim, K.-Y. Sun, Chang-Ai Tang, S.-F. Zhou, Zhi Quan Faculty of Information and Communication Technologies Swinburne University of Technology Australia School of Engineering Sarawak Campus Swinburne University of Technology Malaysia Department of Mathematics and Computing Science University of Groningen Netherlands School of Computer Science and Software Engineering University of Wollongong Australia

ISBN: (纸本)9781627486613

Random Testing (RT) is a fundamental technique of software testing. Adaptive Random Testing (ART) has recently been developed as an enhancement of RT that has better fault detection effectiveness. Several methods (algorithms) have been developed to implement ART. In most ART algorithms, however, the above enhancement diminishes when the dimensionality of the input domain increases. In this paper, we investigate the nature of failure regions in high dimensional input domains and propose enhanced random testing algorithms that improve the fault detection effectiveness of RT in high dimensional input domains. Copyright © (2007) by Knowledge systems Institute (KSI).

关键词： Software testing

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Dynamic code assignment algorithm for CDMA with smart antenna system

Dynamic code assignment algorithm for CDMA with smart antenn...

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IEEE International Conference on Telecommunications and Malaysia communications (ICT-MICC)

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

This paper describes an optimal dynamic code assignment algorithm. This algorithm can be used to maximize the total number of users in a combined CDMA-SDMA multiple access system under minimum quality of service (QoS) and under limited number of available spreading codes L. A single cell adopts a combined CDMA-SDMA system as the air interface, and accommodates an arbitrary number of users K distributed randomly within the cell. The probability of blocking was calculated through simulations to evaluate the system performance under different number of users and available spreading codes. The result shows that the system performance is significantly improved using the proposed algorithm. Additionally, the total number of users can be significantly increased by a small increase in the number of available spreading codes. Finally, the proposed assignment algorithm enhances the code reuse ratio and therefore increases the code efficiency.

关键词： Heuristic algorithms Multiaccess communication system performance Quality of service Wireless communication Multiple access interference Probability Mobile communication Repeaters Mobile antennas

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IMM based Maneuver Detection and Navigation for Road Vehicles with Low Cost GPS/IMU

IMM based Maneuver Detection and Navigation for Road Vehicle...

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IEEE Symposium on Intelligent Vehicle

作者： Rafael Toledo-Moreo Miguel A. Zamora-Izquierdo Antonio F. Gomez-Skarmeta Faculty of Computer Science Department of Information and Communication Engineering University of Murcia Spain

The issue of collision avoidance in road vehicles has been investigated for years from very different points of view. A very interesting approach consists of the creation and interpretation of a scene of the vehicles that can be involved in a conflictive situation. In order to determine the role of the vehicle in the scene, having information of its position, orientation and velocity, as well as its current maneuver state is advisable. This paper is to present a solution based on a very low cost GPS/IMU navigation unit running an interactive multimodel filter (IMM). The description of the proposed architecture for scene creation, the multimodel filter developed and experimental trials in urban and highway scenarios are presented in this paper. The results obtained show the suitability of the proposed solution to the problem under consideration.

关键词： Vehicle detection Navigation Road vehicles Costs Global Positioning system Layout Road transportation Finite impulse response filter Collision avoidance Disaster management

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Lower Power Consumption and Wider Bandwidth of a LNA for Wireless communication Technology at 5 GHz Band

Lower Power Consumption and Wider Bandwidth of a LNA for Wir...

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International Conference on Advanced communication Technology (ICACT)

作者： L. Lee R. M. Sidek S. S. Jamuar S. Khatun Department of Electrical and Electronics Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Malaysia Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Malaysia

A lower power consumption and wider bandwidth low noise amplifier (LNA) operating at 5 GHz frequency band has been designed and simulated in a standard 0.18 mum CMOS technology. The proposed topology uses a capacitor to decouple the AC and DC currents, isolating the circuit elements that are connected in series and share a common DC current. This is followed by the application of a varactor to create a wideband frequency response. The varactor has been swept with voltages stepped at 0.1, 0.5 and 0.9 V to create a wideband LNA working in the frequency range of 5.150 to 5.825 GHz. The LNA simulated provides a high gain of 36.69 dB, noise figure of less than 1.87 dB and draws current at 168.8 mA from a 1.8 power supply.

关键词： Energy consumption Bandwidth Wireless communication communications technology CMOS technology Isolation technology Frequency Varactors Wideband Circuit noise

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Protecting the exchange of medical images in healthcare process integration with Web services

Protecting the exchange of medical images in healthcare proc...

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40th Annual Hawaii International Conference on system sciences 2007, HICSS'07

作者： Chiu, Dickson K.W. Hung, Patrick C.K. Cheng, Vivying S.Y. Kafeza, Eleanna IEEE Dickson Computer System 7A Victory Avenue Kowloon Hong Kong Faculty of Business and Information Technology University of Ontario Institute of Technology Canada Department of Computer Science and Engineering Hong Kong University of Science and Technology Department of Marketing and Communications Athens University of Economics and Business

ISBN: (纸本)0769527558

There is now an increasing demand for sharing images and image data for process integration among healthcare institutions. Web services technology has recently been widely proposed and gradually adopted as a platform for supporting integrations. The Health Insurance Portability and Accountability Act (HIPAA) imposes rules as national standards to protect individuals' health information in the U.S., highlighting security and privacy protection requirements. There are so far no holistic solutions to tackle the various protection issues in this area, especially in inter-institutional healthcare progress integration. We propose the exchange of medical images through a Medical Image Exchange Platform (MIEP), especially replacing ad-hoc and manual exchange practices. We show how contemporary technologies of Web services and watermarking can help archive images with layered implementation architecture. Through dedicated Web services technologies with watermarking mechanism, not only can the development, deployment, and maintenance of software be streamlined, the privacy protection in medical image exchanges as required by disparate processes can also be much facilitated. © 2007 IEEE.

关键词： Medical imaging

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Enhancing security performance with parallel crypto operations in SSL bulk data transfer phase

Enhancing security performance with parallel crypto operatio...

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IEEE International Conference on Telecommunications and Malaysia communications (ICT-MICC)

作者： Hashem Mohammed Alaidaros Mohd Fadlee A. Rasid Mohamed Othman Raja Syamsul Azmir Raja Abdullah Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Communication Technology and Network Faculty of Computer Science and Information Technology Universiti Putra Malaysia Malaysia

Information security, including integrity and privacy, is an important concern among today's computer users due to increased connectivity. Despite a number of secure algorithms that have been proposed, the trade-offs made between security and performance demands further research toward improvement. In bulk data transfer, especially in large messages, the secured processing time takes much longer than non-secured processes. This is due to crypto operations, which include symmetric encryption operations and hashing functions. In the current bulk data transfer phase in secure socket layer (SSL), the server or the client firstly calculates the message authentication code (MAC) of the data using keyed-hash message authentication code (HMAC) operation, and then performs the symmetric encryption on the data together with the MAC. This paper proposes a new algorithm which provides a significant performance gain in bulk data transfer without compromising the security. The proposed algorithm performs the encryption of the data and the calculation of the MAC in parallel. The server calculates the MAC of the data at the same time as the encryption process of the data. Once the calculation of the MAC is completed, only then the MAC will be encrypted. The algorithm was simulated in two processors with one processor performing the MAC calculation and the other on encrypting the data, simultaneously. The communication between the two processors was done via message passing interface (MPI). Based on the performance simulations, the new parallel algorithm gained speedup of 1.74 with 85% efficiency over the current (sequential) algorithm.

关键词： Data security Cryptography Information security communication system security Concurrent computing Message authentication Parallel processing computer security computer networks Data engineering

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