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Canadian Conference on computer and Robot Vision, CRV

作者： V. Patanavijit S. Jitapunkul Digital Signal Processing Research Laboratory (DSPRL) Department of Electrical Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand

The traditional SR image registrations are based on translation motion model therefore super-resolution applications can apply only on the sequences that have simple translation motion. In this paper, we present a novel image registration, the fast affine block-based registration, for performing super-resolution using multiple images. We propose super-resolution reconstruction that uses a high accuracy registration algorithm, the fast affine block-based registration [15], and is based on a maximum a posteriori estimation technique by minimizing a cost function. The L1 norm is used for measuring the difference between the projected estimate of the high-resolution image and each low resolution image, removing outliers in the data and errors due to possibly inaccurate motion estimation. Bilateral regularization is used as prior knowledge for removing outliers, resulting in sharp edges and forcing interpolation along the edges and not across them. The experimental results show that the proposed reconstruction can apply on real sequence such as Suzie.

关键词： Iterative methods Image resolution Image reconstruction Image sequences Bayesian methods Image registration Motion estimation Strontium Maximum a posteriori estimation Cost function

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A Flexible FPGA-based Video Compression system and Its Testing Interface

A Flexible FPGA-based Video Compression System and Its Testi...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Rui Wang Hongxu Jiang Qiujie Li Bo Li Yifang Zen Digital Media Laboratory Department of Computer Science and Engineering BeiHang University Beijing China

This paper presents a FPGA-based video compression system (FVCS) and its testing interface system (TIS). The FVCS is designed in order to implement complex algorithms such as MPEG-4. TIS is implemented to facilitate functions' development. A high-end FPGA from Xilinx's Vertex-4 series has been used to perform the functions including video acquisition, compression and bit-stream transmission. FVCS implements an open architecture with a separate video lens module and can connect an optional extend memory system. Two compression solutions based on FVCS's architecture demonstrate the flexibility

关键词： Video compression system testing Field programmable gate arrays computer architecture computerized monitoring Cameras Lenses computer displays Application specific integrated circuits MPEG 4 Standard

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Robust adaptive control for complex systems employing ANN emulation of nonlinear functions

Robust adaptive control for complex systems employing ANN em...

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8th Seminar on Neural Network Applications in Electrical engineering, Neurel-2006

作者： Dimirovski, Georgi M. Jing, Yuanwei Zhang, Yanxin Vukobratovic, Miomir K. IEEE Dogus University Department of Computer Engineering Acibadem - Kadikoy 34722 Istanbul Turkey SS Cyril and Methodius University Faculty of Electrical Engineering Skopje Macedonia School of Information Science and Engineering Northeastern University Shenyang China Mihailo Pupn Institute Laboratory of Robotics and Flexible Automation Karaburma 11000 Belgrade Serbia

ISBN: (纸本)1424404339

A new robust adaptive control design synthesis, which employs both high-order neural networks and math-analytical results, for a class of complex nonlinear mechatronic systems possessing similarity property has been derived. This approach makes an adequate use of the structural feature of composite similarity systems and neural networks to resolve the representation issue of uncertainty interconnections and subsystem gains by on-line updating the weights. This synthesis does guarantee the real stability in closed-loop but requires skills to obtain larger attraction domains. Mechatronic example of an axis-tray drive system, possessing uncertainties, is used to illustrate the proposed technique. © 2006 IEEE.

关键词： Neural networks

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Multiuser Detection in Ultra-Wideband system with Covariance Shaping Least-Square Estimation

Multiuser Detection in Ultra-Wideband System with Covariance...

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IEEE Region 10 International Conference TENCON

作者： Krissada Asvaskulkeit Widhyakorn Asdornwised Somchai Jitapunkul Digital Signal Processing Research Laboratory Department ofElectrical Engineering Faculty ofEngineering Chulalongkom University Bangkok Thailand Digital Signal Processing Research Laboratory Department of Electrical Engineering Faculty ofEngineering Chulalongkom University Bangkok Thailand

This paper proposed, for UWB radio, a novel interference suppression technique, covariance shaping multiuser detection (CSMU). We demonstrate the improvement of multiuser detection for an UWB pulse based direct sequence spread spectrum system using code division multiple access and show that an application of covariance shaping multiuser detection (CSMU) can reject interference in multiuser wireless communication system. Simulation results show that the CSMU has better performance than decorrelator and match-filter receiver in many users UWB systems. However, the CSMU has much greater than linear MMSE receiver in dynamic range and does not require to know channel

关键词： Multiuser detection Ultra wideband technology Multiaccess communication Binary phase shift keying AWGN Interference suppression Decorrelation Bandwidth Multipath channels Variable speed drives

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Enhancing University Competitiveness through ICT based Knowledge Management system

Enhancing University Competitiveness through ICT based Knowl...

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IEEE International Conference on Management of Innovation and Technology, ICMIT

作者： Somchai Numprasertchai Yuen Poovarawan Innovation and Knowledge Management Research Laboratory (IKM) Department of Computer EngineeringFaculty of Engineering Kasetsart University Bangkok Thailand

Public universities are widely regarded not only as teaching establishments but also as organizations that create new knowledge and support social communities. Under great competition in higher education level, numbers of universities have implemented strategies and tools that improve quality of students and research results and provide several community services for building their competitiveness. ICT based knowledge management is usually recommended as one of important roles to improve efficiency and effectiveness in university mandates and provide many benefits to university. Kasetsart University (KU), one of Thailand's largest and most progressive public universities, has applied KM in its strategies in order to overcome resource scarcity and enhance its competitive advantages. It has developed several KM practices and projects using ICT in several activities which relate to mandates. The initial findings indicate that (1) ICT based KM system significantly enhances the university's competitiveness in term of quality and quantity of student, research results and innovative community services. (2) The specific KM practices and projects support different aspects of university mandates. This ICT based KM system has been implemented and proved to be practical. This system is suitable for the university full of educational mission, innovative research, latest body of knowledge, academic services offered to society and community as well as the Thai culture preservation, a standard mission for Thai higher education institution. This model could be the best practice for further improvement and be customized to fit other universities in other developing countries

关键词： Knowledge management Knowledge engineering Information management Technological innovation computer science education Best practices Communications technology Technology management Knowledge transfer International collaboration

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An open-top chamber model for CO2 injection control

An open-top chamber model for CO2 injection control

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4th World Congress on computers in Agriculture and Natural Resources

作者： Romano, Rodrigo Alvite Saraiva, Antonio Mauro Agricultural Automation Laboratory Department of Computer and Digital Systems Engineering Escola Politécnica da Universidade de São Paulo Av. Prof. Luciano Gualberto travessa 3 no 158 CEP:05508-900 Brazil

ISBN: (纸本)1892769557

Open-top chambers (OTC) are experimental facilities that have been widely used to expose plants to an atmosphere with high concentration of CO2 for a long period. In carbon dioxide enriched environment vegetal species tend to intensify the photosynthesis process and consequently they acquire biomass more quickly. Currently there is a trend to use CO2 injection to speed up the production of vegetal species. In addition, the growing concern with the global warming stimulated experiments with OTC to evaluate the effects of high CO2 concentration on plants. The project of an efficient control system for those chambers depends upon a model that represents the dynamics of the process. This work describes a way to model the CO2 concentration inside an OTC by means of experimental data. The parameters of different auto regressive models (ARX and ARMAX) were estimated to fit the observed data. The models that presented the best performance were analyzed on the frequency domain with the intention of validating the most appropriate model for control purposes. The identification resulted in a first order output error (ARMAX) model that presented a fit of 69.64% to reproduce the validation data. This model showed to be reliable up to 0.35 rad/s.

关键词： Global warming

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Resident participating GIS-based tsunami disaster control systems for local communities

Resident participating GIS-based tsunami disaster control sy...

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International Symposium on Communications and Information Technologies

作者： Muramoto, Takashi Nakayama, Ken Kobayashi, Yoshitake Maekawa, Mamoru Faculty of Business Hachinohe University Aomori Japan Department of Information Systems Design Graduate School of Information Systems University of Electro-Communications Tokyo Japan Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

ISBN: (纸本)9780780397408

We propose and experiment a Social Networking Service (SNS) for local communities for tsunami disaster control. It is an easy-to-use GIS-based system with powerful GIS analysis capabilities. One of the features of the system is resident participation. The GIS layer structure proposed in this paper nicely supports this user participation. The system architecture and the use of the system for tsunami disaster control are discussed. We report ongoing developments in Hachinohe-City, Japan.

关键词： GIS tsunami disaster control internet application system design

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Supervisory signal transmission in distributed Raman amplifiers

Supervisory signal transmission in distributed Raman amplifi...

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IEEE International Workshop on Electronic Design, Test and Applications (DELTA)

作者： Lau Bei Yer V. Kalavally M. Premaratne Tin Win Department of Electrical and Computer Systems Engineering School of Engineering Monash University Malaysia Selangor Malaysia Department of Electrical and Computer Systems School of Engineering Monash University Malaysia Selangor Malaysia Advanced Computing and Simulation Laboratory AXL Department of Electrical and Computer Systems Engineering Faculty of Engineering Monash University VIC Australia

Design parameters of a supervisory (SV) system intended for a distributed Raman amplifier (DBA) is investigated theoretically. The pump is low frequency modulated to transmit supervisory information which forms part of the fault management system in a Raman amplified fiber optic network. Issues regarding modulation frequency of the SV signal and its effect on the integrity of the signal are studied. Power penalty issues due to introduction of the SV signal in the optical network are also studied. These theoretical studies are based on numerical solution of coupled propagation equations for counter-pumped DRA.

关键词： Stimulated emission Distributed amplifiers Optical transmitters Repeaters Frequency Optical pumping Optical amplifiers Design engineering Distributed computing Optical propagation

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On the use of linear prediction for Acoustic Feedback Cancellation in multi-band hearing aids

On the use of linear prediction for Acoustic Feedback Cancel...

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14th European Signal Processing Conference, EUSIPCO 2006

作者： Chaisakul, P. Tangsangiumvisai, N. Luangpitakchumpon, P. Nishihara, A. Digital Signal Processing Research Laboratory Department of Electrical Engineering Chulalongkorn University Bangkok 10330 Thailand Department of Otolaryngology Faculty of Medicine Chulalongkorn University Bangkok 10330 Thailand Center for Research and Development of Educational Technology Tokyo Institute of Technology Tokyo 152-8552 Japan

An efficient approach to mitigate the howling effect in hearing aids is via the use of Acoustic Feedback Cancellation (AFC). In this paper, the use of a Forward Linear Predictor (FLP) is investigated to improve the performance of an AFC system in multi-band hearing aids. The FLP is used to predict the speech input signal before eliminating it from the error signal of the AFC system. computer simulations demonstrate that more accurate estimation of the acoustic feedback signal than the conventional AFC system can be obtained. In addition, maximum usable gain of hearing aids required by the users can be achieved when employing the proposed multi-band AFC system.

关键词： Hearing aids

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A Novel 1.5 $^primeprime$ Quadruple Antenna for Tri-Band GPS Applications

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IEEE Antennas and Wireless Propagation Letters 2006年 5卷 224-227页

作者： Y. Zhou S. Koulouridis G. Kiziltas J. L. Volakis Electroscience Laboratory Electrical and Computer Engineering Department Ohio State Uinversity Columbus OH USA Mechatronics Program of the Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

A new global positioning system (GPS) antenna is proposed to cover the three GPS bands (L1, L2, and L5, namely 1575, 1227, and 1176 MHz) with the L5 band to be added after 2006. The developed antenna size is only $1.5^primeprimetimes 1.5^primeprime$ in aperture corresponding to $lambda/7timeslambda/7$ $(lambda=hboxfree hboxspace hboxwavelength)$ and $lambda/13 hboxthick$. Quadrature feeding is employed to ensure right-hand circular polarized (RHCP) radiation. The final miniature antenna exhibits a gain greater than 2 dBi, and to our knowledge this is the smallest such size for circular polarized (CP) operation covering all three bands. Detailed parametric simulations leading to the best design along with measurements for the constructed antenna are presented.

关键词： Global Positioning system Conductors Dielectric substrates Bandwidth Resonance Aperture antennas Polarization Shape Permittivity Antenna measurements

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