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International Conference on computer and communication engineering 2008, ICCCE08: Global Links for Human Development

作者： Raja Abdullah, R.S.A. Mohd Shafri, Helmi Zulhaidi Bin Roslee, Mardeni Bin Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Department of Civil Engineering Faculty of Engineering Universiti Putra Malaysia

ISBN: (纸本)9781424416929

This work describes an analysis of Ground Penetrating Radar (GPR) measurements at frequency range of 1.7-2.6 GHz to get a relationship between attenuation and density for nine road pavements slabs with different densities. There are about two different frequencies had been tried. The method is simple, fast, contact less and accurate way to determine the density of road pavement. The most important parameter that used in this project is density where it can be used to determine the compressive strength of road pavement. In laboratory, the measurement system consists of a signal generator (250 kHz-3GHz) as a source, spectrum analyzer (100Hz-8GHz), directional coupler with adapter and horn antenna. The first part of the measurement system setup is to determine the amplitude of transmitted wave (received signal strength). A few of received signal strength and attenuation for nine pavement slab samples were taken at two different frequencies. The GPR mixture model has been used to produce the simulation data and has been compared with measurement data. An instantaneous method for measuring the density of road pavement in wave propagation was developed by using microwave transmission/ reflection technique and free space method at two frequencies. The MATLAB software is used to analyze the measurement and simulation data and also for the graphs comparisons. The relative error between measurement and simulation were calculated. The results from the GPR measurement were used and were elaborated in data statistical analysis. ©2008 IEEE.

关键词： Horn antennas

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Emc measurement in a reverberation chamber

Emc measurement in a reverberation chamber

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2013 Asian Pacific Conference on Mechatronics and Control engineering, APCMCE 2013

作者： Rhee, Eugene Lee, Ji Hoon Department of Computer System Engineering Sangmyung University Korea Republic of Department of Information and Communication Engineering Sangmyung University Korea Republic of

ISBN: (纸本)9783037857373

A reverberation chamber, which is a test facility for various electromagnetic compatibility tests, uses a stirrer to generate a uniform electric field inside it. However, a stirrer is a big unit and has difficulties in maintenance. This paper adopted an idea of a diffuser from acoustics to overcome the problems of a stirrer and presents a substitution effect of a diffuser for a stirrer. To validate the substitution effect of a diffuser, a diffuser and a reverberation chamber for 3.0-5.0 GHz band are designed and fabricated. And the real measurement for analyzing the electric field uniformity in a reverberation chamber is done. The measurement results show that the reverberation chamber with a diffuser satisfies the international standard requirement. © (2013) Trans Tech Publications, Switzerland.

关键词： Electromagnetic compatibility

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Deterministic and Stochastic Simulators for Non-Isotropic V2V-MIMO Wideband Channels

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China communications 2018年第7期15卷 18-29页

作者： Yiran Li Xiang Cheng Nan Zhang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Wireless Algorithm Department Product Research and Development System ZTE Corporation

In this paper, we consider a novel two-dimensional(2D) geometry-based stochastic model(GBSM) for multiple-input multiple-output(MIMO) vehicle-to-vehicle(V2V) wideband fading channels. The proposed model employs the combination of a two-ring model and a multiple confocal ellipses model, where the signal is sum of the line-of-sight(Lo S) component, single-bounced(SB) rays, and double-bounced(DB) rays. Based on the reference model, we derive some expressions of channel statistical properties, including space-time correlation function(STCF), Doppler spectral power density(DPSD), envelope level crossing rate(LCR) and average fade duration(AFD). In addition, corresponding deterministic and stochastic simulation models are developed based on the reference model. Moreover, we compare the statistical properties of the reference model and the two simulation models in different scenarios and investigate the impact of different vehicular traffic densities(VTDs) on the channel statistical properties of the proposed model. Finally, the great agreement between simulation models and the reference model demonstrates not only the utility of simulation models, but also the correctness of theoretical derivations and simulations.

关键词： vehicle-to-vehicle wideband channels simulation model statistical properties

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Computed tomography soft tissue restoration using wiener filter

Computed tomography soft tissue restoration using wiener fil...

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2010 8th IEEE Student Conference on Research and Development - engineering: Innovation and Beyond, SCOReD 2010

作者： Naeem Hussien, M. Iqbal Saripan, M. Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

ISBN: (纸本)9781424486489

This paper presents image restoration for Computed Tomography (CT) scan image particularly soft tissue area using image restoration technique. The approach of these technique are using inverse filtering which specifically involving Wiener filter to remove the noise and blur simultaneously in the CT image further restore the degraded CT image. CT scan image usually showing less detail visualization of soft tissue compare to Magnetic Resonance Imaging (MRI) scan image. The new CT image after restoration technique showed significantly high contrast compared to the original CT image produced by the CT scan machine. This procedure also shows comparison of different values use for noise to signal ratio (NSR) in Wiener filter equation to generate the estimate output of CT image. In this procedure values of NSR are treat as constant. ©2010 IEEE.

关键词： Magnetic resonance imaging

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Color Effect on the Face Recognition with Spatial Resolution Constraints

Color Effect on the Face Recognition with Spatial Resolution...

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IEEE International Symposium on Multimedia

作者： Choi, Jae Young Yang, Seungji Ro, Yong Man Plataniotis, Konstantinos N. Image and Video System Laboratory Information and Communication University South Korea Department of Electrical and Computer Engineering University of Toronto Canada

ISBN: (纸本)9781424440894

In the practical face recognition (FR) applications, low-resolution faces (20 x 20 pixels or less) are commonly encountered and negatively impact on reliable performance. To overcome low-resolution face problem, we show that face color can significantly improve the performance compared to intensity-based features. The contribution of this paper is twofold. First, a new metric called 'variation ratio gain' (VRG) is proposed to theoretically prove the significance of color effect on low-resolution faces. Second, we conduct extensive performance comparison studies. In particular, 3,192 color facial images corresponding to 341 subjects, collected from three standard CMU PIE, FERET, and XM2VTSDB face databases, were used to perform comparative studies of color effect on various face resolutions. Experimental results verified that face color feature improves the degraded recognition rate due to low-resolution faces by at least an order of magnitude over intensity-based features.

关键词： Color face recognition Face resolution Identification Variation ratio gain Verification

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Handover Schemes for Vehicular Ad-Hoc Networks over Long Term Evolution Advanced: A Survey

Handover Schemes for Vehicular Ad-Hoc Networks over Long Ter...

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2018 International Conference on Computational Approach in Smart systems Design and Applications, ICASSDA 2018

作者： Salihin, Siti Sabariah Nissirat, Liyth A. Noor, Rafidah Md Ahmedy, Ismail Department of Computer System and Technology Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia Department of Computer Engineering Faculty of Computer and Communication Engineering University of Jadara Jordan

ISBN: (纸本)9781538683699

Next generation Vehicular Ad Hoc Network (VANET) needs seamless connectivity with high level of quality of services (QoS) and high data rates services. The complexity of VANET raises concern about the QoS and the reliability of the communication handover which refer to the connectivity and operation of conveying an ongoing call or data session between Vehicles to Vehicles (V2V) and Vehicles to Infrastructure (V2I) in VANET communication mode. This communication faces a huge challenge. The vehicles are moving so fast and highly dynamic that may cause frequent handover which may cause signal delay and communication loss. This paper provides an up-to-date literature of handover schemes for VANET over LTE-A wireless network. A discussion on thumbnail of the key decision parameters to be used in the handover algorithm and comparative summary of selected scheme for VANET over LTE-A concludes this work. This study, thus contributes to the understanding of the available options and gaps for further studies and standardization activities to this area of research. © 2018 IEEE.

关键词： Surveys

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Innovation or imitation?: Benchmarking: A knowledge-management process to innovate services

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Benchmarking 2004年第6期11卷 610-620页

作者： Massa, Silvia Testa, Stefania DIST Department of Communication Computer and System Science University of Genoa Genoa Italy DIP Department of Industrial Engineering University of Genoa Genoa Italy

Traditionally, benchmarking has been described as a practice that promotes imitation. However, according to a more recent approach, this paper suggests that benchmarking, looking outside the firm boundaries and enabling comparison with others, in terms of both practices and performances, enable the process of acquiring external explicit and tacit knowledge. Such newly acquired knowledge, once integrated with previous internal knowledge of the firm, creates new knowledge that may give rise to improvements and innovations. In order to study the innovative power of benchmarking, this paper presents a three-year research undertaken in the maintenance-services sector that is becoming more and more global and competitive. A model that integrates benchmarking, knowledge management and innovation is presented as the main result of the research. © Emerald Group Publishing Limited.

关键词： Benchmarking Innovation Knowledge management

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Error Correction on iris biometric template using reed solomon codes

Error Correction on iris biometric template using reed solom...

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Asia Modelling Symposium 2010: 4th International Conference on Mathematical Modelling and computer Simulation, AMS2010

作者： Moi, Sim Hiew Saad, Puteh Rahim, Nazeema Abd Ibrahim, Subariah Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia Department of System and Communication Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9780769540627

Pin number or password that is used for authentication can be easily attacked. This limitation triggered the utilization of biometric for secured transactions. Biometric is unique to each individual and is reliable. Among the types of biometric being used currently, iris is the most accurate and it remains stable throughout a person's life. However the major challenge on iris and other biometric for authentication is the intra user variability in the acquired identifiers. Iris of the same person captured at different time may differ due to the signal noise of the iris camera. Traditional cryptography method is unable to encrypt and store biometric template, then perform the matching directly. Minor changes in the bits of the feature set extracted from the iris may lead to a huge difference in the results of the encrypted feature. In our approach, an iris biometric template is secured using iris biometric and passwords. Error Correction Code, ECC is introduced to reduce the variability and noise of the iris data. Experimental results show that this approach can assure a higher security with a low false rejection or false acceptance rate. The successful iris recognition rate using this approach is up to 97%. © 2010 IEEE.

关键词： Biometrics

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An Integrated Scheme to Improve Performance of Fast Mobile IPv6 Handover in IEEE 802.16e Network

An Integrated Scheme to Improve Performance of Fast Mobile I...

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9th IEEE Malaysia International Conference on communications

作者： Seyyedoshohadaei, Seyyed Masoud Khatun, Sabira Ali, Borhanuddin Mohd Othman, Mohamed Anwar, Farhat Department of Computer and Communication System Engineering Universiti Putra Malaysia (UPM) Malaysia Deparment of Communication Technology and Network Universiti Putra Malaysia (UPM) Malaysia Deparment of Electrical and Computer Engineering International Islamic University Malaysia Malaysia

ISBN: (纸本)9781424455324

IEEE 802.16e standard for mobile Worldwide Interoperability for Microwave Access (WiMAX), defines the implementation of hard handover. The standard covers the physical and MAC layer. To apply the layer 3 (L3) handover protocol over the existing IEEE 802.16e layer 2 (L2) handover scheme, the fast mobile IPv6 was used by many researches, but long latency is main challenge for real-time applications. In this paper, to solve latency problem, an integrated scheme is proposed that it combines cross layer design and cross function optimization. The integrated scheme, bases on a pre-establish tunnels concept is dealt both, L2 handover in 802.16e and L3 handover in fast mobile IPv6 to effectively blend the relative messages of L2 and L3. The proposed scheme is compare with the scheme what standardized in IETF network working group (RFC5270). Analytic results prove that the proposed scheme can reduce not only handover latency but also packet losses.

关键词： fast mobile handover handover latency IEEE802.16e packet loss pre-establish tunnel

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Room access monitoring system

Room access monitoring system

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Student Conference on Research and Development, SCOReD 2003

作者： Sahbudin, R.K.Z. Hooi, Lee Choong Guan, Tan Chin Liet, Ling Song Department of Computer and Communication System Engineering Faculty University Putra Malaysia Selangor Darul Ehsan43400 Malaysia

ISBN: (纸本)0780381734

This paper presents a room access monitoring system, which integrates computer and microcontroller MOTOROLA MC68HC1 1A8. Assembly language is used to program the microcontroller and Visual Basic 6 (VB) is used to develop the monitoring system. The monitoring system is divided into server side program (Eyewatch) and client side program. The server side program will inform the user about the door status - Through the client side program. The purpose to develop client side program is to enable user far apart from the door, know the status whether the door is block or not. The microcontroller is integrated with a keypad and LCD display. Only an authorized person can enter the room. If an unauthorized person trying to break through the door, an alarm will be activated. © 2003 IEEE.

关键词： Microcontrollers

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