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A low-power CMOS front-end for photoplethysmographic signal acquisition with robust DC photocurrent rejection

A low-power CMOS front-end for photoplethysmographic signal ...

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作者： Wong, Alex K.Y. Pun, Kong-Pang Zhang, Yuan-Ting Leung, Ka Nang Joint Research Center for Biomedical Engineering The Chinese University of Hong Kong Hong Kong Hong Kong Department of Electrical and Computer Engineering University of Toronto Toronto ON M5S 3G4 Canada The Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced Technology Shenzhen China Key Laboratory for Biomedical Informatics and Health Engineering Chinese Academy of Sciences Shenzhen 518067 China VLSI/ASIC Design Laboratory Department of Electronic Engineering The Chinese University of Hong Kong Hong Kong Hong Kong

A micro-power CMOS front-end, consisting of a transimpedance amplifier (TIA) and an ultralow cutoff frequency lowpass filter for the acquisition of photoplethysmographic signal (PPG) is presented. Robust dc photocurrent rejection for the pulsed signal source is achieved through a sample-and-hold stage in the feed-forward signal path and an error amplifier in the feedback path. Ultra-low cutoff frequency of the filter is achieved with a proposed technique that incorporates a pair of current-steering transistors that increases the effective filter capacitance. The design was realized in a 0.35-μm CMOS technology. It consumes 600 μW at 2.5 V, rejects dc photocurrent ranged from 100 nA to 53.6 μ A, and achieves lower-band and upper-band - 3-dB cutoff frequencies of 0.46 and 2.8 Hz, respectively. © 2008 IEEE.

关键词： Cutoff frequency

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A General Analytical Method for the Performance Evaluation of Multistage Interconnection Networks Supporting Multi-Class Priority Traffic

A General Analytical Method for the Performance Evaluation o...

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4th Advanced International Conference on Telecommunications (AICT 2008)

作者： John Garofalakis Eleftherios Stergiou Department of Computer Engineering and Informatics University of Patras and Research Academic Computer Technology Institute Patras Greece Department Teleinformatics and Communication ATEI of Epirus Arta Greece

In this paper, our investigation focuses on the performance evaluation of Omega multistage interconnection networks which can natively support multi-class priority traffic. For this reason, a multi-buffered, single server switching element is presented and used in the construction of those networks, providing thus better quality of services. The performance evaluation model is based on steady state queuing analysis that leads to a novel utilization's formula. Based on the proposed analysis, other major performance indicators can also be accurately calculated The analytical method was meticulously validated by classic simulation and a part of obtained results was also compared by existing related work. Moreover, the proposed analytical method was found to be very accurate on performance estimations for various network sizes under different offered loads supporting multi-priority traffic. The rationale behind investigating a multi-priority traffic system is to provide efficient networks supporting optimum quality of services (i.e. streaming media vs. file transfer).

关键词： Performance analysis Multiprocessor interconnection networks Telecommunication traffic Traffic control Quality of service Network servers Steady-state Queueing analysis Analytical models Streaming media

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Prediction of protein sub-cellular localization using information from texts and sequences

Prediction of protein sub-cellular localization using inform...

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2008 Current Trends in Biomedical Natural Language Processing, BioNLP 2008

作者： Chun, Hong-Woo Yamasaki, Chisato Saichi, Naomi Tanaka, Masayuki Hishiki, Teruyoshi Imanishi, Tadashi Gojobori, Takashi Kim, Jin-Dong Tsujii, Jun'Ichi Takagi, Toshihisa Database Center for Life Science Research Organization of Information and System University of Tokyo Engineering 12th Bldg. 2-11-16 Yayoi Bunkyo-ku Tokyo113-0032 Japan Japan Biological Information Research Center Japan Biological Informatics Consortium Japan Biological Information Research Center National Institute of Advanced Industrial Science and Technology Japan Department of Computer Science University of Tokyo Japan Graduate School of Information Science and Technology Hokkaido University Japan Center for Information Biology DNA Data Bank of Japan National Institute of Genetics United Kingdom School of Informatics University of Manchester United Kingdom National Centre for Text Mining United Kingdom Department of Computational Biology University of Tokyo Japan

ISBN: (纸本)9781932432114

关键词： Proteins

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Water color component analysis in saltwater intrusion reach - A case study in Shawan-Humen Watercourse, Pearl River Estuary

Water color component analysis in saltwater intrusion reach ...

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Remote Sensing of the Environment: 16th National Symposium on Remote Sensing of China

作者： Fang, Li-Gang Chen, Shui-Sen Li, Dan Zhang, Lixin Li, Dong Department of computer engineering Suzhou Vocational University Suzhou 215104 China Public Lab of Environment Science and Technology Guangdong Province Guangzhou Institute of Geography Guangzhou 510070 China State Key Laboratory of Remote Sensing Science Chinese Academy of Sciences Beijing 100875 China Beijing Normal University Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100875 China Water Supply Corporation of Panyu District Guangzhou 511400 China College of Informatics South Agriculture University Guangzhou 510640 China

The saline water color component characteristic (chlorophyll-a and chromophoric dissolved organic matter (CDOM)) and their spatial change tendency in the Pearl River Estuary from the In-situ data in December of 2006 was studied. Based on the experimental results, the mixing behavior of CDOM in the Shawan-Humen Watercourse was analyzed. The mixing behavior was controlled by topography, hydrological and biological factors, and the relationships among absorption characteristics of CDOM (at 400 nm, ag400). Contained is a discussion of chlorophyll-a concentration and salinity. The chlorophyll-a concentration decreases with increasing CDOM absorption under a salinity of 10, while the chlorophyll-a concentration decreases with increasing salinity. The salinity is becomes less aggressive towards the Lingding Bay in the saltwater intrusion reach of Shawan-Humen, and a low chlorophyll-a concentration area occurs in the Shiziyang riverway where the salinity is greater than 20. The highest chlorophyll-a concentration of surface water was observed in the Dadaoshawei site of the Shawan tributary reach- where the saltwater and freshwater interface. The slope distribution of the CDOM spectral absorption curve in the Shawan-Humen watercourse was increased towards the Lingding Bay direction. The spectral slope S value of CDOM varied from 0.0107 to 0.0121 nm-1 with an average value of 0.0116 nm-1. This was an indication that the terrestrial river input was the main resource of CDOM in the Shawan-Humen watercourse. The high correlation (R2=0.9458) of surface water and bottom water (-7.5m) salinity showed that salinity can be monitored by remote sensing. The ag400 in the saltwater intrusion reach showed conservative behavior, indicating strong characteristics of the CDOM it reflected. There was a correlative relationship between ag400, chlorophyll-a concentration and the salinity, showing that a water color analysis technique can be used to study the distribution and behavior of salinit

关键词： Remote sensing

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A Fuzzy-Based Handover System for Avoiding Ping-Pong Effect in Wireless Cellular Networks

A Fuzzy-Based Handover System for Avoiding Ping-Pong Effect ...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： Leonard Barolli Fatos Xhafa Arjan Durresi Akio Koyama Department of Information Yamagata University Yonezawa Yamagata Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer and Information Science Indiana University-Purdue University Indianapolis Indianapolis IN USA Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain

Many handover algorithms are proposed in the literature. However, to make a better handover and keep the QoS in wireless networks is very difficult. In this paper, we propose a new handover system based on fuzzy logic. The proposed system uses 3 parameters for handoff decision: the change of signal strength of the present Base Station (BS), signal strength from the neighbor BS, and the distance between Mobile Station (MS) and BS. The performance evaluation via simulations shows that proposed system can avoid ping-pong effect and has a good handover decision.

关键词： Mercury (metals) Distance measurement Layout Mobile communication Digital multimedia broadcasting Fuzzy logic Transmitting antennas

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How to Combine Requirements Engineering and Interaction Design?

How to Combine Requirements Engineering and Interaction Desi...

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IEEE International Conference on Requirements Engineering

作者： Hermann Kaindl Larry Constantine Oscar Pastor Alistair Sutcliffe Didar Zowghi Institute of Computer Technology University of Technology Vienna Vienna Austria Human-Centered Software Engineering Lab University of Madeira Constantine & Lockwood limited USA Department of Informatics Systems and Computation Universitad Politécnica de Valencia Spain Systems Engineering in Manchester Business School University of Manchester Institute of Science and Technology UK Faculty of Information Technology University of Technology (UTS) Australia

In this panel, we propose to figure out how requirements engineering and interaction design can be usefully combined. In particular, some people argue that scenarios/ use cases should be concrete, as in story-telling. Others argue for use of "essential" use cases as a methodological approach to interaction and user-interface design. Somewhat in the middle, it is argued that use cases should help acquiring the requirements in the first place. What should the practitioner believe and, in particular, do, in order to develop useful and usable software and systems? Software development and interaction design require different skills and different methods and are typically done by different people. Still, scenario-based design is proposed for several activities relevant for both tasks, such as requirements elicitation, software design, and interaction design. Symbolic modeling in this spirit is actually common to various fields. However, scenario-based approaches vary, especially with regard to their use, e.g., employing abstract use cases or integrating scenarios with functions and goals in a systematic design process. So, the key issue to be raised at the panel is how to combine different approaches, e.g., in scenario-based development, so that the interaction design as well as the development of the user interface and of the software internally result in an overall useful and useable system.

关键词： Design engineering Concrete User interfaces Usability Human computer interaction Software systems Programming Software design Process design Systems engineering and theory

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A Comparative Study of Classification Techniques for Knowledge-Assisted Image Analysis

A Comparative Study of Classification Techniques for Knowled...

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International Workshop on Image Analysis for Multimedia Interactive Services, WIAMIS

作者： G. T. Papadopoulos K. Chandramouli V. Mezaris I. Kompatsiaris E. Izquierdo M. G. Strintzis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical & Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Multimedia and Vision Research Group Queen Mary University of London London UK

In this paper, four individual approaches to region classification for knowledge-assisted semantic image analysis are presented and comparatively evaluated. All of the examined approaches realize knowledge-assisted analysis via implicit knowledge acquisition, i.e. are based on machine learning techniques such as support vector machines (SVMs), self organizing maps (SOMs), genetic algorithm (GA)and particle swarm optimization (PSO). Under all examined approaches, each image is initially segmented and suitable low-level descriptors are extracted for every resulting segment. Then, each of the aforementioned classifiers is applied to associate every region with a predefined high-level semantic concept. An appropriate evaluation framework has been employed for the comparative evaluation of the above algorithms under varying experimental conditions.

关键词： Image analysis Image segmentation Algorithm design and analysis Knowledge acquisition Machine learning Support vector machines Support vector machine classification Self organizing feature maps Genetic algorithms Particle swarm optimization

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A study of integrating digital health network with UPnP in an elderly nursing home

A study of integrating digital health network with UPnP in a...

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computer Systems Architecture Conference (ACSAC), Australasian

作者： Yaw-Jen Lin Mei-Ju Su Heng-Shuen Chen Chiou-I Lin Hang An Nursing Home Taipei Taiwan Department of Medical Informatics College of Medicine National Taiwan University Taiwan Institute of Electronic Engineering College of Electrical Engineering and Computer Science National Taiwan University Taiwan Department of Information Management Central Taiwan University of Science and Technology Taiwan

The percentage of the elderly population grew rapidly in recent years, so the tremendous life and health care needs became an issue of focus in an aging society. The elderly nursing home plays an important role and intends to provide a comfortable environment and living space and serve as safe and healthy place for the elderly. However, the frailty and fragility of the elderly in both physiologically and psychologically make it an uneasy task. To enhance the service and care quality of an elderly nursing home, a ubiquitous monitor system integrated with biosensors and wireless network technology was implemented as a prototyping system. For managing sensors easily, the universal plug and play (UPnP) technology from digital living network alliance (DLNA) is adopted. The system was expected to be a digital health network to improve the activity of daily living (ADL) of the residents, to detect the emergencies or accidents such as stroke, falling down, fainting, and heart attack, in order to enhance the quality of care and promote efficiency at the same time.

关键词： Sensors Medical services Biomedical monitoring Monitoring Base stations Temperature sensors Sensor systems

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Implementation and Design of New Functions for a Web-Based E-learning System to Stimulate Learners Motivation

Implementation and Design of New Functions for a Web-Based E...

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International Conference on Complex, Intelligent and Software Intensive Systems, CISIS

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering FIT Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Computers and System Engineering Tokyo Denki University Hatoyama Saitama Japan

Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is low. One of the reasons is the low study desire and motivation. In our previous work, we implemented a e-learning system that is able to increase the learning efficiency by stimulating learners motivation. In this work, we designed and implemented new functions to improve the system performance.

关键词： Electronic learning Electronic mail Materials Distance learning computers History Cellular phones

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Active mask segmentation for the cell-volume computation and Golgi-body segmentation of hela cell images

Active mask segmentation for the cell-volume computation and...

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IEEE International Symposium on Biomedical Imaging

作者： Gowri Srinivasa Matthew Fickus Manuel N. Gonzalez-Rivero Sarah Yichia Hsieh Yusong Guo Adam D. Linstedt Jelena Kovacevic Department of Biomedical Engineering Center for Bioimage Informatics Department of Mathematics and Statistics Air Force Institute of Technology USA Dept. of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh U.S.A. Dept. of Biomedical Engineering and Center for Bioimage Informatics Carnegie Mellon University Pittsburgh U.S.A. Department of Biological Sciences Carnegie Mellon University Pittsburgh USA

We present a novel active mask framework for the segmentation of fluorescence microscope images of cells, and in particular, for the segmentation of the Golgi body as well as cell- volume computation. We demonstrate that the algorithm is able to efficiently segment a stack of images and successfully assign multiple pieces of the Golgi body in a 2D image to the cell to which they belong. Further, we demonstrate that our algorithm is more accurate than manual segmentation of these images.

关键词： Image segmentation Active contours Level set Fluorescence Microscopy Topology Cells (biology) Proteins Testing Convergence

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