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2007 International Symposium on Signals, Circuits and Systems最新文献

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An Analysis of Asymmetrical RNSIC Converter with Capacitors on the AC Side for High and Medium Power 中大功率带交流侧电容的非对称RNSIC变换器分析
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292781
R. Chiper, D. Alexa, T. Goras, I. Pletea, I. M. Pletea, A. Alexandrescu
{"title":"An Analysis of Asymmetrical RNSIC Converter with Capacitors on the AC Side for High and Medium Power","authors":"R. Chiper, D. Alexa, T. Goras, I. Pletea, I. M. Pletea, A. Alexandrescu","doi":"10.1109/ISSCS.2007.4292781","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292781","url":null,"abstract":"In this paper a topology of an asymmetrical converter having capacitors connected on the AC side, using a rectifier with near sinusoidal input currents (RNSIC-2), is presented. Its configuration includes inductors and capacitors in conjunction with three phase diode bridge rectifier for improving the waveform of current drawn from the utility grid. The performances of the proposed converter are studied and compared with other approaches.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"3 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133268341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Increase of the Efficiency for a Solar Renewable Source Using a Soft Switched DC-DC Boost Converter 利用软开关DC-DC升压变换器提高太阳能可再生能源的效率
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292779
N. Trip, A. Şchiop, M. Tomse
{"title":"Increase of the Efficiency for a Solar Renewable Source Using a Soft Switched DC-DC Boost Converter","authors":"N. Trip, A. Şchiop, M. Tomse","doi":"10.1109/ISSCS.2007.4292779","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292779","url":null,"abstract":"An important role in the solar renewable energy sources play a DC-DC power converter that transforms the electric energy provided by a photovoltaic (PV) system in DC energy to be used for DC loads or to be stored in high capacity battery. This paper presents a new type of active snubber for DC-DC boost converters that can be used in solar renewable sources. The main purpose of this new circuit is to assure a soft turn-off switching of the power switch in a switched mode boost power supply. The efficiency of the switched mode power supply is negatively influenced by the hard switching of its power semiconductor devices. This effect is easier observed in power supply that uses IGBTs as main power switches. The active snubber presented in this work offers a soft switching at the turn-off of the IGBT. The whole energy accumulated by the proposed snubber in the first part of an operation cycle is transferred to the load in the last part of the operating cycle. The simulation results are in very good agreement with the theoretical analysis of the active snubber. This paper also presents experimental results that validate the discussed operation principle.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114217209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Ultra-Low-Power Sensor Networks in Nanometer CMOS 纳米CMOS超低功耗传感器网络
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292635
G. Gielen
{"title":"Ultra-Low-Power Sensor Networks in Nanometer CMOS","authors":"G. Gielen","doi":"10.1109/ISSCS.2007.4292635","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292635","url":null,"abstract":"Ultra low power wireless sensor networks offer large opportunities for ubiquitous sensing and ambient intelligence, in applications such as industrial production, logistics, human health care and comfort, environmental and energy monitoring, etc. This invited talk discusses hardware solutions for such sensor networks when they are constrained by low available energy. A system solution for the network is presented, and a power/performance optimal architecture for the sensor nodes is proposed. Pulsed UWB communication provides low power as well as good locationing capabilities. Also the energy scavenging aspects for autonomous sensor nodes are discussed.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114370436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
An Efficient Object Segmentation Algorithm for Surveillance Systems 一种有效的监视系统目标分割算法
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292731
M. Javan, S.M. Bouzari, A. Salahi
{"title":"An Efficient Object Segmentation Algorithm for Surveillance Systems","authors":"M. Javan, S.M. Bouzari, A. Salahi","doi":"10.1109/ISSCS.2007.4292731","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292731","url":null,"abstract":"In this paper, we propose a novel method for detecting moving objects in a video sequence. The method is mostly suitable for video surveillance sequences in which background has no motion and changes are due to background changes (e.g. illumination changes and changes due to adding or removing parts of background) and the moving objects. In the first stage, we compute the difference image which is the difference between the background image and the coming image. The background image is obtained using a novel method. After that, we divide the difference image into blocks of equal size, and using mean and standard deviation of each block the difference image is divided into two regions at a coarse level (block level): foreground and background. To extract boundaries, we continue the procedure at the pixel level. Finally post processing is needed to eliminate false detection due to noise and eliminating shadow effects. Our proposed method has the ability of detecting multiple objects without knowing the number of objects a priori. In addition, a novel background update is proposed to cope with the changes of the background image.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131831839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
An Investigation Of The Improved Nyquist Pulses Families For OFDM Use 用于OFDM的改进奈奎斯特脉冲族的研究
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292795
L. A. Onofrei, N. Alexandru
{"title":"An Investigation Of The Improved Nyquist Pulses Families For OFDM Use","authors":"L. A. Onofrei, N. Alexandru","doi":"10.1109/ISSCS.2007.4292795","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292795","url":null,"abstract":"The new families of Nyquist pulses recently proposed and studied [15, 16, 17, 18] are investigated for the OFDM use, to reduce the sensitivity of the OFDM systems to the frequency offset. The results presented in this paper are comparable or outperform the recently found pulses [2, 3, 4, 5, 8, 9] in terms of the intercarrier interference (ICI) power.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134065987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Fully Differential Switched Capacitor Amplifier d.c. Common Mode Rejection vs. Capacitors Mismatch 全差分开关电容放大器直流。共模抑制与电容失配
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292656
A. Danchiv, M. Bodea, C. Dan
{"title":"Fully Differential Switched Capacitor Amplifier d.c. Common Mode Rejection vs. Capacitors Mismatch","authors":"A. Danchiv, M. Bodea, C. Dan","doi":"10.1109/ISSCS.2007.4292656","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292656","url":null,"abstract":"This paper develops an analytical model for a standard topology fully differential switched capacitor amplifier (SCA), targeting the capacitors mismatch and differential gain value effects on the amplifier's d.c. common mode rejection. The amplifier was designed in a 0.6 mum process and the analytical model accuracy was compared with the simulation results.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134112860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Delta-Sigma ADC for Ternary Code System (Part I: Modulator Realization) 用于三元码制的Delta-Sigma ADC(第一部分:调制器实现)
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292653
A. Korotkov, D. Morozov, M. Pilipko, A. Sinha
{"title":"Delta-Sigma ADC for Ternary Code System (Part I: Modulator Realization)","authors":"A. Korotkov, D. Morozov, M. Pilipko, A. Sinha","doi":"10.1109/ISSCS.2007.4292653","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292653","url":null,"abstract":"The paper presents realization of the delta-sigma modulator of analog-to-digital converter (ADC) for ternary code signal processing. The modulator corresponds to the second order structure which was simulated on the circuit level. The evaluation demonstrates following characteristics of the modulator: frequency range is about 1 MHz, signal-to-noise ratio (SNR) is 60 dB, and power consumption is about 20 mW.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121959038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Radiology Database Images Retrieving 放射学数据库图像检索
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292689
L. Chiorean, Á. Sipos, M. Vaida
{"title":"Radiology Database Images Retrieving","authors":"L. Chiorean, Á. Sipos, M. Vaida","doi":"10.1109/ISSCS.2007.4292689","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292689","url":null,"abstract":"Oracle database offers the facility of searching and retrieving content-based multimedia objects such as audio, video, image or electronic documents, after a signature. There are different methods for signature generation for each specified object. The content-based image retrieval (CBIR) in Oracle may be realized on a linear search and comparison of the signatures using different parameters, or by image indexing, which are methods available in Enterprise Edition of Oracle Database. medBase is a dedicated application that uses Oracle interMedia for CBIR. Oracle has the possibility to integrate Java classes that offers more flexibility to a programmer in generating and processing the database objects. The chosen technology implemented in this paper is based on JSP, which is capable of realizing distributed web applications, and it can directly access the Java classes and methods offered by Oracle. The dedicated application was tested using different types of radiological images stored in an Oracle database.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122109828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Measurements with ToF Cameras and Their Necessary Corrections ToF相机的测量及其必要的校正
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292691
S. Oprisescu, D. Falie, M. Ciuc, V. Buzuloiu
{"title":"Measurements with ToF Cameras and Their Necessary Corrections","authors":"S. Oprisescu, D. Falie, M. Ciuc, V. Buzuloiu","doi":"10.1109/ISSCS.2007.4292691","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292691","url":null,"abstract":"The most important characteristic of time-of-flight (ToF) cameras is the ability to measure the distance to each image pixel. Thus, for each pixel, information on both its amplitude and distance to the camera are available. However, technological problems inherent to the acquisition principle lead to inaccuracies in estimating both characteristics: on one hand, there are errors in estimating the distance, especially for far-distance pixels. On the other hand, the detected amplitude decreases with the distance. Part of these inaccuracies are corrected with special camera-calibration software. In this paper, we propose two methods that attempt to further correct each information based on the other one. First, the amplitude image is enhanced by using distance information: a pixel-wise, distance-based correction of the amplitude brings to light details otherwise unnoticeable. Secondly, an amplitude-based distance modification corrects some of the distance estimation errors for far-distance pixels.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123637454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 62
Climatological Analysis: A Fast Non-linear Signal Filtering Approach 气候分析:一种快速非线性信号滤波方法
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292707
L. Macedo, J. Szczupak, L. Pinto, E. Molina, T. Ambrizzi, N. Bittencourt
{"title":"Climatological Analysis: A Fast Non-linear Signal Filtering Approach","authors":"L. Macedo, J. Szczupak, L. Pinto, E. Molina, T. Ambrizzi, N. Bittencourt","doi":"10.1109/ISSCS.2007.4292707","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292707","url":null,"abstract":"This paper proposes a new approach to detect, model and analyze climatological signals solely based on the largest eigenvalue of a signal derived matrix, used as a measure of innovation. The resulting process offers a substantial reduction in computational complexity with respect to presently applied methods. Furthermore, the approach yields much precise and detailed result. A case study illustrates the application of the proposed approach to the identification and analysis of a Nino event, tracing the interactions between different regions in the planet and pointing out perturbation paths otherwise unknown, allowing the prediction of the phenomena months before the climatological development.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124892695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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