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International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Andi Sudjana Putra Ng Jun Jie Tan Kok Kiong Engineering Design and Innovation Centre (EDIC) Faculty of Engineering National University of Singapore Singapore Department of Electrical and Computer Engineering Faculty of Engineering National University of Singapore Singapore

This paper presents the development of a real-time response system to enhance student involvement in a class; by means of addressing the attendance and the participation of students. The system consists of student pads on an Android mobile platform, a lecturer pad, and an Apache Tomcat server hosting the software of the system. The system allows the lecturer to keep track of the attendance of every student, as well as monitoring the comprehension of the class in relation to a subject via interactive multiple-choice-questions and short-answer-questions.

关键词： Real time systems Androids Humanoid robots Servers Materials Educational institutions

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Bilateral filter with capability of impulse noise removal

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Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers 2012年第12期66卷 J546-J548页

作者： Hiraoka, Toru Urahama, Kiichi Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita-shi 870-0152 Japan Department of Communication Design Science Faculty of Design Kyushu Uniersity 4-9-1 Shiobaru Minami-Ku Fukuoka-shi 815-8540 Japan

In this letter, we propose an improved bilateral filter of high capability of removing impulse noise with maintaining smoothness of signal and edge preservation. Our improved bilateral filter incorporates an idea of the iris filter into the bilateral filter. We show the effectiveness of our improved bilateral filter through experiments using some example images. The experiments show that our improved bilateral filter can remove impulse noise and maintains image smoothness while preserving edges. © 2012.

关键词： Impulse noise

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Subimage selection from multiple images with joint singular value decomposition for segmentation

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Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers 2012年第9期66卷 J322-J325页

Pixel clustering is a basic process in image segmentation for classifying various regions in an image. However, this clustering becomes complex for multispectral and hyperspectral images due to the high dimensionality of these images. For such cases, dimensionality reduction is usually used to remove component images unsuitable for pixel clustering, in order to reduce computaional cost and improves accuracy. We propose a simple dimensionality reduction method in which a subset of component images is selected from multiple images using the joint singular value decomposition. Results of experiments for LandsatTM multispectral images demonstrate the effectiveness of the proposed method. Segmentation using a subimage chosen by the proposed enables us to avoid mixture of inappropriate component images and improve the performance of the segmentation.

关键词： Singular value decomposition

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Inhibition of non-linear disturbance based on iterative learning control

Inhibition of non-linear disturbance based on iterative lear...

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International Conference on Modelling, Identification and Control (ICMIC)

作者： Fengxia Xu Zhongda Lu Hassan Nouri College of Computer and Control Engineering of Qiqihar University Heilongjiang China Department of Engineering Design Mathematics of University of the West of England Bristol U.K.

There exists a class of nonlinear periodic disturbance in motor system. This nonlinear disturbance relates to some positions of system, and changes periodic by position. The research presents the system model with position dependent periodic disturbance, supposes to satisfy continuous Lipschitz condition, and derives the condition of position dependent period disturbance translating into time dependent periodic error. A novel iterative learning control method is proposed for attenuation multi-period error of system, which constructs learning operator by error convergence analytic, proposes the condition of compensate multi-period steady-state error, proposes and proves that it accelerates the condition of converging learning operator. The research uses simulation by three-axis test turntable. The simulation results verify that the method can compensate successfully period steady-stat error in motor system, and also proves this method can improve the control precision.

关键词： Steady-state Convergence Torque Servomotors Iterative methods Transfer functions Integrated circuits

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The influence of CO2 kinetics on the hypersonic flow near blunt bodies

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AIP Conference Proceedings 2012年第1期1501卷 1102-1109页

作者： E. V. Kustova E. A. Nagnibeda Yu. D. Shevelev N. G. Syzranova Department of Mathematics and Mechanics Saint Petersburg State University 198504 Universitetskiy pr. 28 Saint Petersburg Russia Institute of Computer Aided Design of Russian Academy of Sciences 123056 2d Brestskaya str. 19/18 Moscow Russia

In this paper, the influence of non-equilibrium CO2 kinetics on gas dynamic parameters and transport properties in a viscous shock layer near blunt bodies is studied. This problem is important for accurate prediction of macroscopic parameters and heat transfer near a space vehicle re-entering the Mars atmosphere. The hypersonic flow of reacting CO2/CO/O2/C/O mixture is studied numerically using the accurate kinetic theory models for transport properties and chemical reaction rates proposed in our previous papers on the basis of three-temperature vibrational distributions. The kinetic theory algorithms were implemented directly to the computational fluid dynamics solvers. The transport properties and gas dynamic parameters in 2-D viscous shock layer near blunt bodies of different shape are studied for various test cases under Mars re-entry conditions. The influence of non-equilibrium effects on gas flow parameters and heat transfer is discussed; a quite different structure of a shock layer is found for various body shapes. The comparison with the results obtained using more simple models for CO2 kinetics, transport coefficients, and reaction rates is shown.

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Brain computer Interface-based Multimedia Controller

Brain Computer Interface-based Multimedia Controller

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Kevin C. Tseng Yu-Te Wang Bor-Shing Lin Ping Han Hsieh Department of Industrial Design Chang-Gung University Taiwan Department of Computer Science and Engineering University of California San Diego USA Department of Computer Science and Information Engineering National Taipei University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan

Music is a way of expressing our feelings and emotions in daily life. Suitable music can affect people in a positive way. However, current multimedia control methods, such as manual selection or automatic random mechanism which is now applied broadly in MP3 and CD player, cannot adaptively select suitable music according to the user's state. In this study, we proposed a novel brain computer interface (BCI)-based multimedia controller to help people to select suitable music according their cognitive states. In our system, a multimedia control MIDlet program built in the mobile phone was developed to recognize the user's cognitive state and select suitable music according his/her cognitive state. A wireless multi-channel electroencephalograph (EEG) acquisition module was also designed for monitoring the user's EEG. By the property of selecting suitable music type according to the user's cognitive state, our BCI-based mobile multimedia controller provides a novel prototype of multimedia controller.

关键词： Electroencephalography Multimedia communication Mobile handsets Rhythm Wireless communication Brain modeling

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Performance Improvement of the LM Device and Its Application to Precise Measurement of Motion Trajectories within a Small Range with a Machining Centre

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Modern Mechanical engineering 2012年第3期2卷 71-85页

作者： Hua Qiu Yong Yue Akio Kubo Chao Lin Kai Cheng Dehong Huo Dayou Li 1Department of Mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Advanced Manufacturing and Enterprise Engineering Department School of Engineering and Design Brunel University Uxbridge UK Department of Computer Science and Technology University of Bedfordshire Luton UK Department of Mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Product Design and Engineering Department School of Engineering and Information Sciences Middlesex University London UK State Key Laboratory of Mechanical Transmission Chongqing University Chongqing China

In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre;2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer;and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested.

关键词： Motion Accuracy Measurement Device Performance Improvement Small Size Motion Machining Centre

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Impact of the quality of spatial 3D city models on sensor networks placement optimization

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Geomatica 2012年第4期66卷 291-305页

作者： Argany, Meysam Mostafavi, Mir Abolfazl Akbarzadeh, Vahab Gagné, Christian Yaagoubi, Reda Centre for Research in Geomatics Department of Geomatics Université Laval QC Canada Computer Vision and System Laboratory Department of Electrical Engineering and Computer Engineering Université Laval QC Canada Department of Geomatics Faculty of Environmental Design King Abdulaziz University Jeddah Saudi Arabia

Sensor networks are increasingly used for tracking, monitoring, and observing spatial dynamic phenomena in the real world (e.g. urban area). In order to ensure an efficient deployment of a sensor network, several optimization algorithms have been proposed in recent years. Most of these algorithms often rely on oversimplified sensor models. In addition, they do not consider information on the terrain topography, city models, and the presence of diverse obstacles in the sensing area (e.g. buildings, trees, poles). Only some of those optimization algorithms attempt to consider the terrain information in the optimization of a sensor network deployment. However, most of these algorithms consider that the spatial models used for this purpose are perfect representations of the reality and are not sensitive to the quality of the information. However, spatial models are simplified representations of a complex reality, and hence are inherently uncertain. In this paper we will investigate the impact of the spatial data quality on the optimization of a sensor network and its spatial coverage in an urban area. For this purpose, we will investigate specific implications of spatial data quality criteria for a 3D city model that will be used in sensor network optimization algorithms. Then, we will analyze the impact of some of those criteria on the estimation of sensor network coverage.!Afterwards, a case study for sensor network deployment in an urban area will be presented. This case study will demonstrate the impact of 3D city models quality on the estimation of coverage using global and local optimization algorithms. Finally, the results obtained from this experimentation will be presented and discussed.

关键词： Sensor networks

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IBIS modeling using latency insertion method (LIM)

IBIS modeling using latency insertion method (LIM)

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IEEE Workshop on Signal Propagation on Interconnects (SPI)

作者： Jose E. Schutt-Ainé Jilin Tan Ping Liu Feras Al-Hawari Ambrish Varma Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL USA Cadence Design Systems Chelmsford MA USA

This paper presents an approach for the transient simulation of I/O buffers described by IBIS models. Using the latency insertion method a formulation can be obtained for the transient behavior of IBIS models and external circuitry. The formulation offers better convergence than traditional Newton-Raphson methods and is therefore more robust. Several computer simulations are performed to validate the method.

关键词： Integrated circuit modeling Abstracts Accuracy

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On approximating string selection problems with outliers

On approximating string selection problems with outliers

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23rd Annual Symposium on Combinatorial Pattern Matching, CPM 2012

作者： Boucher, Christina Landau, Gad M. Levy, Avivit Pritchard, David Weimann, Oren Department of Computer Science University of California San Diego CA United States Department of Computer Science University of Haifa Haifa 31905 Israel Polytechnic Institute of NYU Brooklyn NY 11201-3840 United States Shenkar College for Engineering and Design Ramat-Gan Israel CRI University of Haifa Mount Carmel Haifa 31905 Israel CEMC University of Waterloo Canada

ISBN: (纸本)9783642312649

Many problems in bioinformatics are about finding strings that approximately represent a collection of given strings. We look at more general problems where some input strings can be classified as outliers. The Close to Most Strings problem is, given a set S of same-length strings, and a parameter d, find a string x that maximizes the number of "non-outliers" within Hamming distance d of x. We prove that this problem has no polynomial-time approximation scheme (PTAS) unless NP has randomized polynomial-time algorithms, correcting a decade-old mistake. The Most Strings with Few Bad Columns problem is to find a maximum-size subset of input strings so that the number of non-identical positions is at most k;we show it has no PTAS unless P=NP. We also observe Closest to k Strings has no efficient PTAS (EPTAS) unless the parameterized complexity hierarchy collapses. In sum, outliers help model problems associated with using biological data, but we show the problem of finding an approximate solution is computationally difficult. © 2012 Springer-Verlag.

关键词： Hamming distance

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