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IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.最新文献

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Circuit simulation and moving mesh generation 电路仿真和运动网格生成
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412441
Gilbert Strang, Per-Olof Persson
{"title":"Circuit simulation and moving mesh generation","authors":"Gilbert Strang, Per-Olof Persson","doi":"10.1109/ISCIT.2004.1412441","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412441","url":null,"abstract":"The paper outlines two different topics in computational engineering, linear algebra and mesh generation. Many areas of applied mathematics lead to the same fundamental problem in numerical linear algebra. We identify this problem for a network of resistors. Then we discuss the nonlinear problems of circuit simulation, and algorithms for solving them. The generation of a well-spaced mesh is an essential step for partial differential equations (and also for computer graphics). We describe a short, simple, and public code for unstructured meshes. Then we illustrate recent ideas in moving the mesh as the region changes. We want to emphasize the \"fundamental problem of applied mathematics\" and the new ideas in mesh generation. Our work on linear algebra (the essential subject!) appears on the course page (see http://web.mit.edu/18.06). Video lectures are also available on MIT's OpenCourseWare Website (see http://ocw.mit.edu) under Mathematics.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117188187","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: 9
Characterization of ultra-wideband antenna with human body 人体超宽带天线的特性研究
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413911
S. Promwong, W. Hachitani, G. Ching, J. Takada
{"title":"Characterization of ultra-wideband antenna with human body","authors":"S. Promwong, W. Hachitani, G. Ching, J. Takada","doi":"10.1109/ISCIT.2004.1413911","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413911","url":null,"abstract":"This work presents the characterization of an ultra wideband antenna with the human body. An experiment of the antenna transfer function needs the three-antenna method for calibrating the reference antenna. The results are used to evaluate the transmission gain based on the extended Friis' transmission formula. A matched filter is considered at the receiver side to maximize the SNR for evaluation. This technique gives very accurate results and is very useful for the design and evaluation of UWB impulse radio transmission systems, especially for the evaluation of waveform distortion effects.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115244152","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: 12
The CMOS analog multiplier free from mobility reduction CMOS模拟乘法器免于迁移率降低
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412442
K. Dejhan, N. Suwanchatree, P.P.I. Chaisayun
{"title":"The CMOS analog multiplier free from mobility reduction","authors":"K. Dejhan, N. Suwanchatree, P.P.I. Chaisayun","doi":"10.1109/ISCIT.2004.1412442","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412442","url":null,"abstract":"In this paper, a CMOS analog multiplier circuit is proposed. It consists of eight voltage subtractors, four voltage sources and a multiplier cell. Its major advantage is its freedom from mobility reduction, so it has low total harmonic distortion (THD). For the proposed multiplier cell, its inputs are applied to the drains of the input cell transistors through the voltage sources. Their gates are fixed to the same bias voltage to remove the effect of mobility reduction. The simulation results show that the THD is less than 0.13% for 0.8 V/sub P-P/ input signal at 2.5 V supply voltage, and that the -3 dB bandwidth is up to 38 MHz.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129812905","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
Proposal for multiple methods of active net model 主动网络模型的多种方法
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412883
H. Noda, Y. Sumi, N. Yabuki, S. Matumae, Y. Fukumoto, T. Ueda, Y. Fukui
{"title":"Proposal for multiple methods of active net model","authors":"H. Noda, Y. Sumi, N. Yabuki, S. Matumae, Y. Fukumoto, T. Ueda, Y. Fukui","doi":"10.1109/ISCIT.2004.1412883","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412883","url":null,"abstract":"In this paper, we propose a new method for active net model. The active net is a lattice network model that is based on minimizing energy to extract the region of a target object. In a conventional method, only one target is detected by one net. Therefore, assuming that the image can be divided into some parts, the proposed method uses many nets and applies them to each divided image. Some simulation results are presented obtained by applying the proposed method to images. In the proposed method, since the size of a net becomes small, the processing time to one net can be shortened. Furthermore, since the distance between lattice points is short in the initial net, the target at the end of an image becomes detectable. That is, it means that the target detection performance has improved.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129496249","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
A CMOS voltage-controlled grounded resistor using a single power supply 使用单电源的CMOS压控接地电阻
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412463
K. Dejhan, N. Suwanchatree, P. Prommee, S. Piangprantong, I. Chaisayun
{"title":"A CMOS voltage-controlled grounded resistor using a single power supply","authors":"K. Dejhan, N. Suwanchatree, P. Prommee, S. Piangprantong, I. Chaisayun","doi":"10.1109/ISCIT.2004.1412463","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412463","url":null,"abstract":"The paper proposes a voltage-controlled grounded resistor. The principle of the proposed circuit is nonlinearity term cancellation of a MOS operating in the ohmic region. The circuit consists of a nonsaturation-operated MOS transistor and a voltage adder circuit. Its advantage over other grounded resistors is that this circuit uses a single low voltage power supply. Simulation results are carried out by using PSpice.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124532275","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: 19
E-type planar antenna printed on dielectric substrate 电介质基板上印刷的e型平面天线
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413810
K. Sakurai, H. Matsui, T. Wakabayashi
{"title":"E-type planar antenna printed on dielectric substrate","authors":"K. Sakurai, H. Matsui, T. Wakabayashi","doi":"10.1109/ISCIT.2004.1413810","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413810","url":null,"abstract":"An E-type planar antenna printed on a dielectric substrate is proposed for mobile and satellite communications. It is analyzed by the finite difference time domain (FDTD) method. The characteristics of the antenna such as return loss, far field patterns and current distribution are shown for structural parameters of the planar antenna. This antenna is of simple structure and is easily fabricated.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124589946","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
A design of four-quadrant analog multiplier 四象限模拟乘法器的设计
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412443
K. Dejhan, P. Prommee, W. Tiamvorratat, S. Mitatha, I. Chaisayun
{"title":"A design of four-quadrant analog multiplier","authors":"K. Dejhan, P. Prommee, W. Tiamvorratat, S. Mitatha, I. Chaisayun","doi":"10.1109/ISCIT.2004.1412443","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412443","url":null,"abstract":"The paper proposes a new four-quadrant analog multiplier which consists of a multiplier cell, a mixed signal circuit and three signal subtraction circuits. Its advantages are: the design has single ended inputs; the geometry of all the transistors is equal; its output can be the product of two signal voltage, or the product of a signal current and a signal voltage. Simulation results are demonstrated by PSpice to confirm the operation of the circuit.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121924544","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
MPEG-4 codec with spatio-temporal rate control 具有时空速率控制的MPEG-4编解码器
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413817
K. Miyata, A. Taguchi
{"title":"MPEG-4 codec with spatio-temporal rate control","authors":"K. Miyata, A. Taguchi","doi":"10.1109/ISCIT.2004.1413817","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413817","url":null,"abstract":"In the case of a video delivery system which is constructed by a constant bit-rate channel, the encoder must send a constant number of bits per unit time period. Therefore, the number of bits used in encoding must be regulated by the rate control algorithm. Basically, the rate control of a video signal, such as MPEG-4, is realized by adaptive quantization. However, since adaptive quantization has the limitation of bit regulation, temporal resolution conversion is also introduced. Temporal resolution conversion is effective for decreasing the number of bits for encoding; however, the conversion causes a decrease in temporal resolution. Decreasing temporal resolution becomes a jerky degradation. In order to keep the temporal resolution, we introduce spatial resolution conversion for the rate control algorithm. Moreover, we show how to choose temporal resolution conversion or spatial resolution conversion. Thus, the proposed method realizes low bit-rate video coding while preserving the original frame-rate.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"9 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120968225","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: 0
GSM channel management using cell load dependent algorithm on air-interface 基于空口小区负荷相关算法的GSM信道管理
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413807
P. Thaibunterng, S. Noppanakeepong, N. Khongkoom
{"title":"GSM channel management using cell load dependent algorithm on air-interface","authors":"P. Thaibunterng, S. Noppanakeepong, N. Khongkoom","doi":"10.1109/ISCIT.2004.1413807","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413807","url":null,"abstract":"In a congestion situation, some mobile subscribers are disconnected from the network due to network handling capability being limited from the cellular networks. This is despite resource expansion to satisfy the demand for supply for more mobile subscribers. Cell load dependent algorithm is a channel efficient method to increase network handling capability for the cell site having high traffic peaks. By this feature, half rate channels are only assigned during traffic peak hours automatically, and a flexible assignment is provided. Before assigning a channel, the BSC checks the percentage of busy channels and then BSC handles the threshold comparison, evaluation and assignment of the half and full channels to their networks. During off peak time, we can offer higher speech quality via only full rate channels. When cell load dependent mechanism is activated, adaptive multirate for half rate channels will be activated automatically.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121322542","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: 0
A digital image watermarking technique using prediction method and Weber ratio 基于预测法和韦伯比的数字图像水印技术
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412860
T. Phiasai, P. Kumhom, K. Chamnongthai
{"title":"A digital image watermarking technique using prediction method and Weber ratio","authors":"T. Phiasai, P. Kumhom, K. Chamnongthai","doi":"10.1109/ISCIT.2004.1412860","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412860","url":null,"abstract":"Most violations of digital image copyrights are the cropping of some parts of the image such as human face for applying to other images without permission. Seriously cropped watermarked images which have various shapes, sizes and locations make it difficult to verify the copyright. This paper proposes a digital image watermarking technique in the spatial domain using prediction method and the Weber ratio. Pixels for embedding the watermarks are altered based on the binary watermark image using the Weber ratio to control the strength of the watermark. Our technique does not require the host image to extract the watermarks. An extracted watermark is computed by subtracting the watermarked pixel with its predicted pixel The experimental results showed that our technique yielded high similarity of the watermarks when a watermarked image was attacked by JPEG compression and the cropping attack.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121280765","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: 7
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