IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.最新文献_第10页

A new quadripartite public-key cryptosystem 一种新的四部分公钥密码系统

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412453

T. Nagase, R. Koide, T. Araki, Y. Hasegawa

引用次数: 12

Robust recursive least squares adaptive beamforming algorithm 鲁棒递归最小二乘自适应波束形成算法

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412846

Xin Song, Jinkuan Wang, Han Wang

{"title":"Robust recursive least squares adaptive beamforming algorithm","authors":"Xin Song, Jinkuan Wang, Han Wang","doi":"10.1109/ISCIT.2004.1412846","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412846","url":null,"abstract":"When adaptive arrays are applied to practical problems, the performance degradation of adaptive beamforming techniques may become even more pronounced than in ideal cases because some of the underlying assumptions on the environment, sources, or sensor array can be violated and this may cause a mismatch between the presumed and actual signal steering vectors. In fact, the performances of existing adaptive array algorithms are known to degrade substantially in the presence of even slight mismatches between the actual and presumed array responses to the desired signal. Similar types of degradation can take place when the signal array response is known precisely but the training sample size is small. On the basis of the recursive least squares (RLS) algorithm, we propose a novel approach to robust adaptive beamforming. Our robust RLS adaptive beamforming algorithm provides excellent robustness against signal steering vector mismatches and small training sample size, offers faster convergence rate, makes the mean output array SINR consistently close to the optimal one, and improves the unitary mismatch. Computer simulations demonstrate a visible performance gain of the proposed robust RLS algorithm.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"28 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":"132831354","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

3D shape reconstruction using extended Kalman filter with an active camera 基于扩展卡尔曼滤波的有源摄像机三维形状重建

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413839

K. Nakao, K. Kondo, S. Kobashi, Y. Hata, T. Yagi

引用次数: 8

A ridgelet representation of semantic object using watershed segmentation 基于分水岭分割的语义对象脊波表示

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.3169/ITEJ.59.786

M. Hasegawa, S. Tajima

引用次数: 0

QoS (quality-of-service) improvement in IEEE 802.11e enhanced distributed channel access (EDCA) IEEE 802.11e增强型分布式信道接入(EDCA)中的QoS(服务质量)改进

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412858

Hyunmin Kyung, Sang-Ho Seo, Sin-Chong Park

{"title":"QoS (quality-of-service) improvement in IEEE 802.11e enhanced distributed channel access (EDCA)","authors":"Hyunmin Kyung, Sang-Ho Seo, Sin-Chong Park","doi":"10.1109/ISCIT.2004.1412858","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412858","url":null,"abstract":"The IEEE 802.11e medium access control (MAC) is an emerging supplement to the IEEE 802.11 wireless local area network (WLAN) standard to support quality-of-service (QoS). IEEE 802.11e MAC is based on both controlled and contention-based channel access mechanisms. The controlled channel access is based on the poll-and-response protocol. On the other hand, the contention-based channel access, called EDCA, is based on the carrier-sense multiple access with collision avoidance (CSMA/CA). This paper proposes an algorithm that enhances the QoS of the enhanced distributed channel access (EDCA) in 802.11e. The proposed algorithm, named enhanced distributed contention control (EDCC), estimates the congestion level of the channel without overheads and adapts it for deciding transmission of data. Simulation experiments show that the proposed algorithm increases the channel utilization ratio more than 30%, reduces collision rate more than 50%, and reduces voice drop rate about 8% and video drop rate about 75% in comparison with EDCA. Moreover, the complexity of the proposed algorithm remains similar to the EDCA, enabling the design of low-cost implementations.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"30 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":"133367490","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

Exercise sequence adaptation in programming education 程序设计教育中的练习顺序适应

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413821

H. Taguchi, F. Shimakawa

{"title":"Exercise sequence adaptation in programming education","authors":"H. Taguchi, F. Shimakawa","doi":"10.1109/ISCIT.2004.1413821","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413821","url":null,"abstract":"There exist many kinds of exercise sequences to teach the fundamental contents of C programming, and each student's understanding can be affected by the sequence choice. However, in programming education today, teachers usually give same exercise problems to all students, yet often in the same order. Therefore, many students on a programming course suffer from the difference between their own levels of acquiring programming skills and the progress of the course. Some of them feel it difficult to catch up with the progress. On the other hand, students with a high aspiration toward learning are not always satisfied with the slowness of the progress. To solve this problem, the paper proposes a procedure to produce an appropriate exercise sequence, depending on the degree of understanding by the student. The exercise sequence would suit each student because its selection is based on information not only about a single student, but also about students learning in the same environment. We have developed a questionnaire for students of a C programming course. From the questionnaire results, it has been found that a student's attitude to learning is important information, as well as the degree of understanding, for selecting an appropriate exercise sequence.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"148 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":"133135243","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

Noise reduction method for sinusoidal and wideband noise based on ALE and noise reconstruction filter 基于ALE和噪声重构滤波器的正弦和宽带噪声降噪方法

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412909

K. Sumi, N. Sasaoka, Y. Itoh, K. Fujii, S. Tsuiki

引用次数: 1

A comparison of integer fast Fourier transforms for lossless coding 用于无损编码的整数快速傅里叶变换的比较

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413884

Y. Yokotani, S. Oraintara, R. Geiger, G. Schuller, K. Rao

{"title":"A comparison of integer fast Fourier transforms for lossless coding","authors":"Y. Yokotani, S. Oraintara, R. Geiger, G. Schuller, K. Rao","doi":"10.1109/ISCIT.2004.1413884","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413884","url":null,"abstract":"The lifting scheme-based integer fast Fourier transform (IntFFT), an integer approximation of the FFT, is reversible. When it is used for lossless coding applications, the computational complexity and approximation error increase due to realization of the trivial butterflies by three lifting steps. Since the error appears as a \"noise floor\" and it limits the lossless coding efficiency, it is desirable to reduce not only the computational complexity but also the noise floor level as much as possible. This survey presents two schemes to realize an improved IntFFT in terms of the number of arithmetic operations and the level of the noise floor. The first scheme is based on employment of two/three lifting step schemes with combined rounding operations, and the second one is the multidimensional lifting (MDL) scheme. The improvement is shown by comparing the number of arithmetic operations and rounding operations to compute the IntFFT and also by comparing levels of the noise floor. In addition, an improvement in lossless coding efficiency due to the reduced noise floor can be predicted by observing the reduced estimated entropy of the IntFFT coefficients.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"29 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":"123604383","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

Algebraic declaration and axiom based validation for user interface design of IT instrument 基于代数声明和公理的IT仪器用户界面设计验证

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412485

Y. Kikuchi, S. Kanai, T. Kishinami

引用次数: 0

Robust speech analysis in noisy environment using running spectrum filtering 基于运行频谱滤波的噪声环境下的鲁棒语音分析

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413869

Q. Zhu, N. Ohtsuki, Y. Miyanaga, N. Yoshida

引用次数: 11