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

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Performance comparison of advanced video coding H.264 standard with baseline H.263 and H.263+ standards 高级视频编码H.264标准与基线H.263和H.263+标准的性能比较
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413814
G. Raja, M. J. Mirza
{"title":"Performance comparison of advanced video coding H.264 standard with baseline H.263 and H.263+ standards","authors":"G. Raja, M. J. Mirza","doi":"10.1109/ISCIT.2004.1413814","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413814","url":null,"abstract":"The emerging ITU-T H.264 standard is designed to serve wide range of applications such as digital storage media, television broadcasting, and real time communication. It has significant improvement over all previous video compression standards. We provide an independent analysis of the coding performance improvement of H.264 over various other existing standards. Our test results shows that H.264 can achieve 4 dB PSNR gain over baseline H.263 and 3.7 dB PSNR gain over H.263+ for sequences of range of typical content for low and high latency applications.","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":"122294461","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: 23
New design of FIR digital differentiators having maximally linearity at middle of the frequency band 新设计的FIR数字微分器在频带中部线性度最大
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412474
I. R. Khan, M. Okuda, R. Ohba
{"title":"New design of FIR digital differentiators having maximally linearity at middle of the frequency band","authors":"I. R. Khan, M. Okuda, R. Ohba","doi":"10.1109/ISCIT.2004.1412474","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412474","url":null,"abstract":"Maximal linear FIR digital differentiators are preferred over others, like minimax designs, for narrow band applications. Most of the existing maximally linear designs achieve maximal linearity at zero frequency, and relatively lower attention has been given to the designs accurate in mid and higher frequency bands. We present a simple design accurate for midband frequencies, by forcing the maximal linearity constraints at half of the Nyquist frequency. The design problem is formulated as the solution of a system of linear equations, obtained by imposing maximal linearity constraints to the general frequency response of the filter. Certain special characteristics of the determinant of the coefficients matrix of these equations are explored and used in derivation of the explicit formulas for the impulse response coefficients.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"310 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":"122783324","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
Weaving threads of actions for personal information management 为个人信息管理编织动作线索
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413824
H. Shimakawa, S. Kaede, E. Nakamura, S. Azuma
{"title":"Weaving threads of actions for personal information management","authors":"H. Shimakawa, S. Kaede, E. Nakamura, S. Azuma","doi":"10.1109/ISCIT.2004.1413824","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413824","url":null,"abstract":"Our daily work consist of many tasks. We would manage our work, switching among many threads, which is the course of task execution. To support it, PIM (personal information management) tools have been developed. These tools, however, take no account of an efficient flow of actions. The paper discusses a method to weave the threads harmoniously, in other words, to suggest an action schedule which is efficient to its user from a total view point. In this method, a context corresponds to each thread. It is regarded as a sequence of states brought by acts in the thread. The method reorganizes several fixed sequences of acts into a single efficient sequence, being aware of whole contexts. For the reorganization, the paper presents an elaborate modeling of contexts and actions.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"7 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":"114503349","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
Novel Motion-JPEG2000 video transmission system over CDMA environment 基于CDMA环境的新型Motion-JPEG2000视频传输系统
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412851
Y. Inoue, Y. Kajikawa, Y. Nomura
{"title":"Novel Motion-JPEG2000 video transmission system over CDMA environment","authors":"Y. Inoue, Y. Kajikawa, Y. Nomura","doi":"10.1109/ISCIT.2004.1412851","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412851","url":null,"abstract":"The paper proposes a transmission system for Motion-JPEG2000 video in mobile communications. In Motion JPEG2000, video data are compressed in frames according to JPEG2000 part1. In JPEG2000 part1 encoding, an input image is coded in the order of significant sub-bands, which are low-frequency bands. The proposed transmission system therefore assigns each sub-band data suitable weights according to their significance by using orthogonal multi-code CDMA so that bit errors are concentrated in the high-frequency sub-bands which are of little significance on image reconstruction. Concretely speaking, copies of significant sub-band data are made and the copied data are orthogonally multiplexed. The multiplexed data are averaged in the receiver so that the bit errors of significant sub-bands are reduced. On the other hand, the other sub-band data are not copied in order to increase transmission rates. Furthermore, audio data are transmitted with high quality by orthogonal multiplexing. The proposed system adaptively performs the above process for video and audio data. Moreover, these proposed systems are effective in the progressive order of LRCP (layer - resolution level - component - position) and of RLCP (resolution level - layer - component - position) on JPEG2000. Simulation results demonstrate that the proposed system can improve image quality compared with the conventional transmission system under the same BER.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"69 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":"114573547","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
Implementation of switched-current FIR filter using distributed arithmetic technique: exploitation of digital concept in analogue domain 用分布式算法实现开关电流FIR滤波器:数字概念在模拟域的应用
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412467
P. Sirisuk, A. Worapishet, S. Chanyavilas, K. Dejhan
{"title":"Implementation of switched-current FIR filter using distributed arithmetic technique: exploitation of digital concept in analogue domain","authors":"P. Sirisuk, A. Worapishet, S. Chanyavilas, K. Dejhan","doi":"10.1109/ISCIT.2004.1412467","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412467","url":null,"abstract":"Recently, a distributed arithmetic (DA) technique has been employed in digital implementation of finite impulse response (FIR) filters, since it can significantly reduce hardware resources at the cost of higher clock frequency. In this paper, we show that the concept of DA can be efficiently exploited in an analogue domain. Specifically, a switched-current (SI) FIR filter is realized based upon the concept of DA. In addition, it is revealed that the DA SI FIR filter offers extended maximum achievable resolution normally dictated by transistor matching. The technique also helps reduce silicon area and power requirements. Two examples of FIR filter design according to WCDMA and cdma2000 specifications are presented to demonstrate the feasibility of the novel technique. Simulation results are shown to confirm the circuit functions.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"65 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":"128413417","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: 6
Efficient scheme for motion estimation and block size mode selection in H.264 H.264中运动估计和块大小模式选择的有效方案
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413815
N. Khan, S. Masud, A. Ahmad, M. A. Maud
{"title":"Efficient scheme for motion estimation and block size mode selection in H.264","authors":"N. Khan, S. Masud, A. Ahmad, M. A. Maud","doi":"10.1109/ISCIT.2004.1413815","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413815","url":null,"abstract":"The paper presents efficient algorithms for enhancing the computational performance of an H.264 video encoder. We employ previously calculated motion vectors and variable block size modes from neighboring blocks to select the best modes and motion vectors for the current macroblock. The scheme results in 40% to 70% improvement in the encoding time over a reference implementation without degradation in the subjective quality. The average SNR and the compression performance do not show variation from the reference codec implementation. Results based on a number of video sequences are presented that clearly demonstrate the benefit of the proposed motion estimation and block size mode selection algorithm. The proposed scheme has been shown to provide the least computational load with improvement in the encoding time. The reduction in memory requirements and calculations makes this scheme useful for VLSI implementation and realtime applications.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"22 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":"128572855","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
Radio agent realizing user utility-based resource allocation in wireless spot access 无线代理实现无线点接入中基于用户效用的资源分配
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412855
T. Kaji, Y. Minoda, K. Tsukamoto, S. Komaki
{"title":"Radio agent realizing user utility-based resource allocation in wireless spot access","authors":"T. Kaji, Y. Minoda, K. Tsukamoto, S. Komaki","doi":"10.1109/ISCIT.2004.1412855","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412855","url":null,"abstract":"The paper proposes a new radio resource allocation based on the user utility for a spot access system. The radio agent allocates the wireless transmission mode and time slots for each access user according to the user utility and the channel CNR (carrier-to-noise power ratio). The proposed scheme can improve the service quality quantified by the user utility. We evaluate the latency performance and the user utility performance of the proposed scheme by computer simulations. The results show the suitability of the proposed scheme.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"24 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":"130357085","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: 8
Analysis of inverse class frequency in centroid-based text classification 基于质心的文本分类中逆类频率分析
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413903
V. Lertnattee, T. Theeramunkong
{"title":"Analysis of inverse class frequency in centroid-based text classification","authors":"V. Lertnattee, T. Theeramunkong","doi":"10.1109/ISCIT.2004.1413903","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413903","url":null,"abstract":"Most previous works on text categorization applied term occurrence frequency and inverse document frequency for representing importance of terms. This work presents an analysis of inverse class frequency in centroid-based text categorization. There are two aims of this paper. The first one is to find appropriate functions of inverse class frequency. The other is to find the key factors for using inverse class frequency. The experimental results show that the key factors, which improve classification accuracy, are the numbers of few-class terms and most-class terms. When large numbers of few-class terms and most-class terms are obtained, the logarithmic function of inverse class frequency is the most effective when it is combined with term frequency. The square root of inverse class frequency incorporated into TFIDF, works well in the case when data sets include a small number of few-class terms and most-class terms. To increase the numbers of these effective terms, some methods are involved i.e. using higher gram models, small number of classes and large number of training sets.","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":"129137203","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: 30
The design of a pair of orthogonal scaling filters 设计了一对正交缩放滤波器
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413881
G. Deng, D. Tay, S. Marusic
{"title":"The design of a pair of orthogonal scaling filters","authors":"G. Deng, D. Tay, S. Marusic","doi":"10.1109/ISCIT.2004.1413881","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413881","url":null,"abstract":"We consider designing a scaling filter that is orthogonal to another scaling filter. This is motivated by recent research on the complex wavelet transform and its applications. It is expected that the two wavelet transformations of the same signal using a pair of orthogonal scaling filters will be able to capture different characteristics of the signal. This will open up new pathways for improving the performance of certain wavelet based signal processing techniques. We present design examples using both parameterization for orthogonal wavelets and numerical optimization. We also demonstrate an application of the orthogonal scaling filter pairs in signal denoising.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"5 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":"127781852","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
A design of CMOS tunable current amplifiers CMOS可调谐电流放大器的设计
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412899
K. Kaewdang, W. Surakampontom, N. Fujii
{"title":"A design of CMOS tunable current amplifiers","authors":"K. Kaewdang, W. Surakampontom, N. Fujii","doi":"10.1109/ISCIT.2004.1412899","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412899","url":null,"abstract":"Two CMOS tunable current amplifiers are proposed in this paper. They are voltage-controlled current gain and current-controlled current gain. Both circuits are designed based on CMOS OTA which are linearly tunable. The circuits achieve their linearity by squaring the nonlinear transconductance of the balanced CMOS OTA. The proposed voltage-controlled current amplifier can be linearly tuned by DC voltage. The amplifier's nonlinearity is less than 1% for the voltage control (V/sub c/) range from -2V to 2V. The current-controlled current amplifier can also have a linearly tunable current gain by DC bias current over three decades (0.1-20) with an error less than 1.5%. The performance of the proposed circuit is discussed and confirmed through PSPICE simulation.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"25 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":"127786743","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
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