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作者： Shakya, Kabita Deegan, Catherine Hegarty, Fran Markham, Charles Sch. of Informatics and Engineering Inst. of Technology Blanchardstown Dublin 2 Ireland Dept. of Med. Phys. and Bioeng. St. James's Hospital Dublin 2 Ireland Department of Computer Science National University of Ireland Maynooth Ireland

This paper presents a new technique to determine the dynamic and frequency response of capnographs using a custom built 'EtCO2 simulator system'. Capnographs are devices that use CO2 from a patients' expired breath to monitor the cardiopulmonary status during anaesthesia and mechanical ventilation. Capnographs at present are routinely calibrated via a static calibration method only. The dynamic response of the capnographs is not accounted for. The frequency and time response are important as they determine if capnographs can be used in high frequency and pediatric ventilation schemes. Experiments performed using the method described in this paper proved that old capnographs usually do not satisfy the manufacturer quoted specifications for time and frequency response. Therefore, a routine check for capnographs is recommended. The method can also be used to verify manufacturer quoted specifications. The EtCO2 simulator system, designed and constructed simulates human respiration cycle. The gas sources used are 5% CO2 and room air that can be switched alternatively. Both supplies are pressure regulated and connected through non-return valves to electric valves. The valves are microprocessor controlled and the on/off time is user defined allowing a wide range of waveforms to be simulated. The output from the simulator is delivered to capnograph. Capnograms are captured by digital video recording. The captured video in 'avi' file format is then converted into individual frames. These frames are converted into digital data through image processing in Matlab. The data obtained is subjected to extensive analysis to determine the frequency and time response of the respective capnograph. Copyright 2005 ISA. All Rights Reserved.

关键词： Biomedical equipment

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The effect of cumulative lookahead on conservative parallel simulation performance

The effect of cumulative lookahead on conservative parallel ...

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19th Annual European Simulation and Modelling Conference, ESM 2005

作者： Solčány, Viliam Šafařík, Jiří Faculty of Informatics and Information Technologies Slovak University of Technology Ilkovičova 3 842 16 Bratislava Slovakia Dept. Computer Science and Engineering University of West Bohemia Univerzitní 8 306 14 Plzeň Czech Republic

ISBN: (纸本)9077381228

This work is in the area of parallel discrete event simulation. We consider a conservatively synchronized parallel simulation where submodels consist of multiple entities, each with some amount of lookahead. We explore the issue of improving the lookahead of a submodel by combining the lookahead abilities of individual entities. We review the concepts and conditions for cumulative lookahead. We provide an experimental evaluation of the effect of cumulative lookahead on simulation performance.

关键词： Discrete event simulation

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A region-based approach to conceptual image classification

A region-based approach to conceptual image classification

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IEE International Conference on Visual Information engineering, VIE 2005

作者： Papadopoulos, Symeon Mezaris, Vasileios Kompatsiaris, Ioannis Strintzis, Michael G. Information Processing Laboratory Electrical and Computer Engineering Dept. Aristotle University of Thessaloniki Thessaloniki 54006 Greece Informatics and Telematics Institute Centre for Research and Technology Hellas 1st Km Thermi-Panorama Rd Thessaloniki 57001 Greece

Classifying images into a set of semantic categories that are meaningful to humans has proved to be a challenging and attractive problem in the field of content-based retrieval. Addressing this problem is typically based on the initial extraction of low-level features for the images and the subsequent application of a pattern recognition technique, to divide the feature space in a number of subspaces corresponding to the semantic categories. An extension to this framework is presented in this paper, aiming at the improvement of the efficiency of image classification systems. This is based on the introduction of an unsupervised still image segmentation algorithm to the process and its combination with MPEG-7 low-level descriptors and a Bayes classifier. Experimental results using different pairs of classes and corresponding data sets demonstrate the efficiency of the proposed approach.

关键词： Image processing

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A motion-flow-based fast video retrieval system 7

A motion-flow-based fast video retrieval system

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7th ACM SIGMM International Workshop on Multimedia Information Retrieval, MIR 2005

作者： Su, Chih-Wen Liao, Hong-Yuan Mark Fan, Kuo-Chin Lin, Chia-Wen Tyan, Hsiao-Rong Dept. of Comp. Sci. and Info. Eng. National Central University Taiwan Inst. of Info. Sci. Academia Sinica Taiwan Department of Computer Science and Information Engineering National Chung-Cheng University Taiwan Department of Information and Computer Engineering Chung-Yuan Christian University Taiwan

ISBN: (纸本)1595932445

In this paper, we propose the use of motion vectors embedded in MPEG bitstreams to generate so-called "motionflows", which are applied them to perform quick video retrieval. By using the motion vectors directly, we do not need to consider the shape of a moving object and its corresponding trajectory. inst.ad, we simply "link" the local motion vectors across consecutive video frames to form motion flows, which are then annotated and stored in a video database. In the video retrieval phase, we propose a coarse-to-fine strategy to execute the video retrieval task. Motions that do not belong to the main-stream motion flows are filtered out by our proposed algorithm. The retrieval process can be triggered by query-by-sketch (QBS) or query-by-example (QBE). The experiment results show that our method is indeed efficient and accurate in the video retrieval process. Copyright © 2005 ACM.

关键词： Motion analysis

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A New Concept On A Quantum computer Based On Schockley‐Read‐Hall Recombination Statistics In Microelectronic Devices

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AIP Conference Proceedings 2005年第1期772卷 1463-1464页

作者： K. Theodoropoulos D. Ntalaperas I. Petras A. Tsakalidis N. Konofaos 1Computer Engineering and Informatics Dept. University of Patras Patras Greece 2Research Academic Computer Technology Institute Riga Feraiou 61 26110 Patras Greece

In this paper a quantum computer based on the recombination processes happening in semiconductor devices is presented. A “data element” and a “computational element” are derived based on Schokley‐Read‐Hall statistics and they can later be used in order to manifest a simple and known quantum algorithm. Such a paradigm is shown by the application of the proposed technology onto the Shor’s period‐finding algorithm.

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A genetic algorithm-based approach to knowledge-assisted video analysis

A genetic algorithm-based approach to knowledge-assisted vid...

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IEEE International Conference on Image Processing 2005, ICIP 2005

作者： Voisine, N. Dasiopoulou, S. Precioso, F. Mezaris, V. Kompatsiaris, I. Strintzis, M.G. Information Processing Laboratory Electrical and Computer Engineering Dept. Aristotle University of Thessaloniki 540 06 Thessaloniki Greece Informatics and Telematics Institute Centre for Research and Technology Hellas 1st Km Thermi-Panorama Road Thessaloniki 57001 Greece

ISBN: (纸本)0780391349

Efficient video content management and exploitation requires extraction of the underlying semantics, a non-trivial task associating low-level features of the image domain and high-level semantic descriptions. In this paper, a knowledge-assisted approach for extracting semantics of domain-specific video content is presented. Domain knowledge considers both low-level features (color, motion, shape) and spatial behavior (topological and directional information). During the preprocessing step, a set of over-segmented homogenous atom-regions is generated and their low-level and spatial descriptions are extracted. A genetic algorithm is then applied in order to find the optimal interpretation according to a specific domain conceptualization. The proposed approach was tested on the Formula One, Tennis and beach vacations domains showing promising results. © 2005 IEEE.

关键词： Image analysis

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On optimal predicting model and algorithm about nonlinear chaotic time series

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and engineering) 2005年第1期29卷 60-63页

作者： Jiang, Weijin Xu, Yusheng Sun, Xinming Dept. of Computer Zhuzhou Inst. of Technology Zhuzhou 412008 China Coll. of Mech. Eng. Beijing Univ. of Technology Beijing 100022 China

The chaotic was a kind of widespread nonlinear line dynamics behavior. To counter the difficulty of estimating and controlling chaotic time series, it puts forward a chaotic estimating model, by using the parameter of the chaotic system and sensitivity of the parameter it inches and controls the disturbance of the system, and estimates the parameter of the model by using the best update option. At the end, it forecasts the intending series value in its mutually space. The example shows that it can increase the precision in the estimated process by selecting the best model steps. It not only conquers the abuse of using detention inlay technique alone, but also decreases blindness of using forecasting error to decide the input model directly. The result is better than that of other method of statistics and other series means.

关键词： Chaotic time series Improved change ruler method Optimal prediction model Parameter identification

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Applying classification techniques to remotely-collected program execution data

Applying classification techniques to remotely-collected pro...

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ESEC/FSE'05 - Joint 10th European Software engineering Conference (ESEC) and 13th ACM SIGSOFT Symposium on the Foundations of Software engineering (FSE-13)

作者： Haran, Murali Karr, Alan Orso, Alessandro Porter, Adam Sanil, Ashish Dept. of Statistics Penn State University University Park PA United States National Institute of Statistical Sciences Triangle Park NC United States College of Computing Georgia Inst. of Technology Atlanta GA United States Dept. of Computer Science University of Maryland College Park MD United States

ISBN: (纸本)1595930140

There is an increasing interest in techniques that support measurement and analysis of fielded software systems. One of the main goals of these techniques is to better understand how software actually behaves in the field. In particular, many of these techniques require a way to distinguish, in the field, failing from passing executions. So far, researchers and practitioners have only partially addressed this problem: they have simply assumed that program failure status is either obvious (i.e., the program crashes) or provided by an external source (e.g., the users). In this paper, we propose a technique for automatically classifying execution data, collected in the field, as coming from either passing or failing program runs. (Failing program runs are executions that terminate with a failure, such as a wrong outcome.) We use statistical learning algorithms to build the classification models. Our approach builds the models by analyzing executions performed in a controlled environment (e.g., test cases run in-house) and then uses the models to predict whether execution data produced by a fielded inst.nce were generated by a passing or failing program execution. We also present results from an initial feasibility study, based on multiple versions of a software subject, in which we investigate several issues vital to the applicability of the technique. Finally, we present some lessons learned regarding the interplay between the reliability of classification models and the amount and type of data collected. Copyright 2005 ACM.

关键词： Data handling

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Efficient multi-rate relaying (EMR) MAC protocol for ad hoc networks

Efficient multi-rate relaying (EMR) MAC protocol for ad hoc ...

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IEEE International Conference on Communications (ICC)

作者： J.S. Pathmasuritharam A. Das A.K. Gupta Networking Dept. Inst. for Infocomm Res. Singapore School of Computer Engineering Nanyang Technological University Singapore

In this paper, we propose a multi-rate CSMA/CA-based MAC protocol, which we refer to as EMR, to enable fast forwarding of frames in a more efficient manner. We use the base-rate RTS and CTS frames to reserve a long transmission path and utilize intermediate nodes to relay the data frames using shorter transmission distance but with more efficient transmission rates. Results show that our EMR scheme can outperform the traditional multi-rate forwarding scheme by 18% and 49.4% in a low-density and high-density ad hoc network, respectively.

关键词： Media Access Protocol Ad hoc networks Frame relay Multiaccess communication Throughput Protective relaying computer networks Performance analysis Wireless application protocol Delay

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The innovation of pseudo SIP server under VoIP ad-hoc networks

The innovation of pseudo SIP server under VoIP ad-hoc networ...

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Proceedings - 6th World Wireless Congress, WWC

作者： Chang, Lin-Huang Chuang, Ping-Da Chen, Yu-Jen Yang, Cheng-Ying Graduate Inst. of Networking and Communication Eng. ChaoYang Univ. of Tech. Taichung Taiwan Department of Information Management ChaoYang Univ. of Tech. Taichung Taiwan Dept. of Computer Science and Information Engineering National Formosa Univ. Yunlin Taiwan

The VoIP is a newest killer application nowadays on Internet which is expected to be carried on at anytime and anywhere. However, the re-configuration problem as well as signaling and transmission delay will be major concerns for a mobile node moving into a foreign network. In this paper, we design the pseudo SIP server under a configuration-free Ad-Hoc architecture VoIP system. The innovation of proposed pseudo SIP server solves the problem with no standalone SIP server on Ad-Hoc network. The performance evaluation of the proposed pseudo SIP server also shows significant improvement in SIP signaling delay.

关键词： Mobile telecommunication systems

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