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IEEE EMBS Conference on Biomedical engineering and Sciences (IECBES)

作者： N.D. Osman M.S. Salikin M.I. Saripan M.Z.A. Aziz N.M. Daud Radiological and Oncological Cluster Universiti Sains Malaysia Penang Malaysia Medical Imaging Department Universiti Teknologi MARA Puncak Alam Malaysia Department of Computer and Communication System Engineering Universiti Putra Malaysia Serdang Malaysia Radiology Department Hospital Universiti Sains Malaysia Kubang Kerian Malaysia

This paper presents a correction algorithm for metal artefacts in CT images using a novel technique known as dual-step adaptive thresholding (DSAT). The proposed artefact correction algorithm was applied to selected artefactual phantom and clinical CT images. The missing projection data due to metal is detected and extracted by double-thresholding technique. The DSAT-based algorithm allows significant reduction of the artefact and preserves most of the anatomical structures in the corrected CT images.

关键词： Metals Computed tomography Imaging phantoms Image segmentation Image reconstruction Phantoms Interpolation

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Stepping experiment analysis of a biaxial piezoelectric actuated stage

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2013 International Conference on Advances in Materials Science and Manufacturing Technology, AMSMT 2013

作者： Mou, Shann Chyi Zhuang, Yu Ren Department of Mechanical Engineering Chien Hsin University of Science and Technology Taiwan Institute of Computer Communication and System Engineering Ching Yun University Taiwan

ISBN: (纸本)9783037857984

In this research, our research team used the self-designed piezoelectric actuator to achieve the micro/nanometer level precise positioning biaxial piezoelectric actuated stage through the redesign of stage mechanism. A novel piezoelectric actuator structure - 4-9-9-14 piezoelectric actuator is constructed, and it is made of piezoelectric buzzer to drive the stage. The movement of the piezoelectric actuated stage is read and analyzed by means of NI PCI-6115 data acquisition card and Lab- VIEW software operating in conjunction with a linear encoder. The new consideration of tuning time Ton is used to place of traditional method of changing the magnitude of driving voltage to control the stepping distance of the stage. Under a constant driving voltage, the displacement of the stage increases with time Ton, and the displacement of the stage decreases with time Ton. The aforesaid phenomenon occurs to leftward or rightward movement of the upper stage and forward or backward movement of the lower stage. Given a constant time Ton, the displacement of the stage in motion decreases with the driving voltage, and the displacement of the stage in motion increases with the driving voltage. © (2013) Trans Tech Publications, Switzerland.

关键词： Piezoelectric actuators

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Implementation of radar map using gps in vehicular networks

Smart Innovation, Systems and Technologies

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Smart Innovation, systems and Technologies 2013年 20卷 663-672页

作者： Kuo, Chun-I Wang, Po-Ching Lin, Chih-Hsun Shieh, Ce-Kuen Tsai, Ming-Fong Institute of Computer and Communication Engineering Department of Electrical Engineering Nation Cheng Kung University Taiwan ICT Design and Validation for Vehicles Department Div. for Telematics and Vehicular Control System Information and Communications Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)9783642354519

In the highway environment, many applications require localization. It is common to use the Global Positioning system (GPS) to find the current position, but GPS is easily influenced by the external environment and has many internal errors. Dead Reckoning (DR) is a common method for correcting the GPS position. However, the related applications do not have a notice system that can show the number of and distances to neighboring vehicles. In this paper, we design a map application on the Android operating system for vehicular networks. In this map application, the road map would be shown on a monitor, and the neighboring vehicles could also be drawn on this map. Users can easily understand the road conditions. Moreover, the application can exchange traffic information with other vehicles, and the map can also show the vehicles which are out of range. Furthermore, the application can show the time to collision between two vehicles. The experimental results will show the adjustment of position corrected by DR on Google Map, and the radar map on the Android operating system. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Android (operating system)

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Multi-objective parametric analysis of pem fuel cell performance for modified flow field based on Taguchi method and PCA

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ICIC Express Letters 2013年第5期7卷 1649-1656页

作者： Ku, Hui-Wen Chang, Chi-Yuan Hsu, Chao-Hsing Department of System and Naval Mechatronic Engineering National Cheng Kung University No. 1 Ta-Hsueh Road Tainan 701 Taiwan Department of Computer and Communication Engineering Chienkuo Technology University No. 1 Chiehshou North Road Changhua City 500 Taiwan

This paper is to perform an experimental and numerical study on the various arrangements of cuboids transversely installed in the side of field plates and then to investigate how the flow characteristics and the heat and mass transfer affect the performance of PEM fuel cell. Then, for the best arrangement of the cuboids in the channel, the Taguchi method and PCA for the multi-objective parametric optimization is then used in the experiment to determine the optimal combination of five primary operating parameters for maximum electrical power and minimum pressure drops. The results show that the electrical power is more for multi-objectives than for single-objective by 30%, average RPQL more for multi-objectives than for single-objective by 51.28%, but the pressure drops less for multi-objectives than for single-objective by 275%. © 2013 ISSN 1881-803X.

关键词： Taguchi methods

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An analysis of the radar backscatter from oil-covered sea surfaces using moment method and Monte-Carlo simulation: preliminary results

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Acta Oceanologica Sinica 2013年第1期32卷 59-67页

作者： YANG Chan-Su PARK Seong-Min OH Yisok OUCHI Kazuo Korea Ocean Satellite Center Korea Institute of Ocean Science & Technology (KIOST) Marine Environmental System Science University of Science and Technology ISR R&D Laboratory LIG Nex1 Company Department of Electronics Information and Communication Engineering Hongik University Department of Computer Science School of Electrical and Computer Engineering National Defense Academy

An analysis of the radar backscattering from the ocean surface covered by oil spill is presented using a mi- crowave scattering model and Monte-Carlo simulation. In the analysis, a one-dimensional rough sea sur- face is numerically generated with an ocean waveheight spectrum for a given wind velocity. A two-layered medium is then generated by adding a thin oil layer on the simulated rough sea surface. The electric fields backscattered from the sea surface with two-layered medium are computed with the method of moments （MoM）, and the backscattering coefficients are statistically obtained with N independent samples for each oil-spilled surface using the Monte-Carlo technique for various conditions of surface roughness, oil-layer thickness, frequency, polarization and incidence angle. The numerical simulation results are compared with theoretical models for clean sea surfaces and SAR images of an off-spilled sea surface caused by the Hebei （Hebei province, China） Spirit oil tanker in 2007. Further, conditions for better oil spill extraction are sought by the numerical simulation on the effects of wind speed and oil-layer thickness at different inci- dence angles on the backscattering coefficients.

关键词： method of moments Monte-Carlo technique oil spills backscattering coefficient

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Analysis of Wardriving Activity and WiFi Access Points

Analysis of Wardriving Activity and WiFi Access Points

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1st International Conference on Wireless Sensor Networks for Developing Countries, WSN4DC 2013

作者： Eldaw, Elbaraa Zeki, Akram M. Senan, Shayma Department of Information System Kulliyyah of Information and Communication Technology International Islamic University Malaysia Malaysia Department of Electrical and Computer Engineering Kulliyyah of Engineering International Islamic University Malaysia Malaysia

ISBN: (纸本)9783642410536

This paper proposes a system composed of hardware and software components that facilitates the activity of wardriving and assists in collecting statistical data by GPS of WiFi networks and their security status in particular area. The application has the potential of being used as a tool to study WiFi security trends or for misuse and WiFi exploitation. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Wireless local area networks (WLAN)

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Adaptive Design Model on Heterogeneous Learning Management system (LMS) by Utilizing Multi-Agent system (MAS)

Adaptive Design Model on Heterogeneous Learning Management S...

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作者： Amir Kombo Mwinyi S.A.R Al-Haddad Rusli bin Hj Abdullah Shaiful Jahari bin Hashim Department Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia

Content synchronization in LMS (Learning Management system) is a new area of research which involves the transfer of data from one machine to another. Many researchers have conducted their researches concerning synchronization in different applications on data transfer. Therefore, in this paper we introduce a new idea of synchronization in heterogeneous LMSs and to share learning contents among different learning institutions. The major contribution in this paper, is based on the integration of rsync with MAS (Multi-Agent system) in heterogeneous learning management systems (LMSs) environment using SCORM (Sharable Content Object Reference Model), so as different learning institutions in higher education (HE) can seamlessly share learning contents in the different LMSs. Hence, a new model of heterogeneous LMS (HLMS) has been presented for easily sharing of learning contents in Higher Learning Institutions (HLI).

关键词： Heterogeneous LMS, Interoperability, Multi-agent system, Synchronization, SCORM

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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： Eugene Rhee Jihoon Lee Department of Computer System Engineering Sangmyung University Department of Information and Communication Engineering Sangmyung University

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.

关键词： Electromagnetic Compatibility Electromagnetic Interference Reverberation Chamber

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Atomic population distribution of excited states in He electrodeless discharge lamp

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Chinese Optics Letters 2013年第10期11卷 11-14页

作者：陶智明王彦飞张盛楠王东颖洪叶龙庄伟陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering and Computer SciencePeking University Department of Physics Bijie University

Population ratios between excited states are measured to build the excited state Faraday anomalous dispersion optical filter(ESFADOF). We calculate these values between the excited states according to the spontaneous transition probabilities using rate equations and the measured intensities of fluorescence spectral lines of He atoms in an electrodeless discharge lamp in the visible spectral region from 350 to 730 nm. The electrodeless discharge lamp with populations in excited states can be used to realize the frequency stabilization reference of the laser frequency standard. This lamp can also build ESFADOFs for submarine communication application in the blue-green wavelength to simplify the system without the use of a pump laser.

关键词： rate Atomic population distribution of excited states in He electrodeless discharge lamp

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Short-term load forecasting in hospital systems

Short-term load forecasting in hospital systems

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World Congress on Medical Physics and Biomedical engineering

作者： Bertolini, S. Massucco, S. Silvestro, F. Grillo, S. Giacomini, G. Department of Communication Computer and System Sciences University of Genoa Via All'Opera Pia 13 16145 Genoa Italy Department DYNATECH University of Genoa Genoa Italy Department of Electrical Engineering Polytechnic of Milano Milan Italy

ISBN: (纸本)9783642293047

Short-term load forecasting can provide information which is applicable for the possible energy interchange with other utilities. Load forecasting is also advantegeous for system security, in fact if applied to the system security assessment problem, it can provide valuable information to detect many vulnerable situations in advance. In addition if the work environment is in a hospital reality, where a continuous energy and electricity utilization is required, all the problems previously listed are amplified and of a greater importance, because of the continuous use of new technological instruments. In this study a neural network approach for the hospital energy load forecast is illustrated .The data sets belong to the University Eye Clinic of Genoa, S. Martino Hospital, Genoa, Italy, and to the department of Internal Medicine and Medical Specialties (DIMI) of the University of Genoa, Italy. These two environments represent different approaches in patient treatment and this study aims to determine if the same tool is beneficial in load forecasting for both wards. In both realities the presented approach reached a target of more than 75% of correct forecasts. © 2013 Springer-Verlag.

关键词： Neural networks

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