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2007 International Symposium on Communications and Information Technologies最新文献

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Maximum Likelihood localization of wireless networks using biased range measurements 使用有偏距离测量的无线网络的最大似然定位
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392137
A. Weiss, J. Picard
{"title":"Maximum Likelihood localization of wireless networks using biased range measurements","authors":"A. Weiss, J. Picard","doi":"10.1109/ISCIT.2007.4392137","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392137","url":null,"abstract":"Localization of ad-hoc wireless networks is useful for services, management and routing. Localization is frequently based on station-to-station range measurements and a few reference sensors. We address the localization problem in the case of incomplete set of noisy range measurements with unknown bias. A statistically efficient, maximum likelihood algorithm, inspired by the Gerchberg-Saxton procedure for phase retrieval, is presented. In addition, a compact explicit expression for the Fisher Information matrix is provided. A set of numerical examples demonstrates the bias effect on the localization accuracy. As expected, the localization accuracy improves when the unknown bias is estimated.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132960612","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
Non-intrusive eye gaze direction tracking using color segmentation and Hough Transform 基于颜色分割和霍夫变换的非侵入性眼球注视方向跟踪
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392089
Dong Liang, Lim Kok Houi
{"title":"Non-intrusive eye gaze direction tracking using color segmentation and Hough Transform","authors":"Dong Liang, Lim Kok Houi","doi":"10.1109/ISCIT.2007.4392089","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392089","url":null,"abstract":"This paper presents a method to detect and track the movement of the eye in a controlled context based on image processing techniques with minimal hardware support. Primary image processing techniques used in this paper are color segmentation and Hough Transform for circle detection. This system is capable of detecting the movement of the eye and its direction with reasonable accuracy.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132175533","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
Error probability analysis of IP Time To Live covert channels IP实时隐蔽信道的错误概率分析
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392082
S. Zander, P. Branch, G. Armitage
{"title":"Error probability analysis of IP Time To Live covert channels","authors":"S. Zander, P. Branch, G. Armitage","doi":"10.1109/ISCIT.2007.4392082","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392082","url":null,"abstract":"Communication is not necessarily made secure by the use of encryption alone. The mere existence of communication is often enough to raise suspicion and trigger investigative actions. Covert channels aim to hide the very existence of the communication. The huge amount of data and vast number of different protocols in the Internet makes it ideal as a high-bandwidth vehicle for covert communications. A number of researchers have proposed different techniques to encode covert information into the IP time to live (TTL) field. This is a noisy covert channel since the TTL field is modified between covert sender and receiver. For computing the channel capacity it is necessary to know the probability of channel errors. In this paper we derive analytical solutions for the error probabilities of the different encoding schemes. We simulate the different encoding schemes and compare the simulation results with the analytical error probabilities. Finally, we compare the performance of the different encoding schemes for an idealised error distribution and an empirical TTL error distribution obtained from real Internet traffic.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130262493","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
Java2 distributed application development (Socket, RMI, Servlet, CORBA) approaches, XML-RPC and web services functional analysis and performance comparison Java2分布式应用程序开发(Socket、RMI、Servlet、CORBA)方法，XML-RPC和web服务功能分析和性能比较
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392224
D. Jagannadham, V. Ramachandran, H. Kumar
{"title":"Java2 distributed application development (Socket, RMI, Servlet, CORBA) approaches, XML-RPC and web services functional analysis and performance comparison","authors":"D. Jagannadham, V. Ramachandran, H. Kumar","doi":"10.1109/ISCIT.2007.4392224","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392224","url":null,"abstract":"This paper analyses the functional aspects and compares the performance differences of most commonly used distributed application development approaches in Java (Sockets, RMI, HTTP Servlet, CORBA, and RMIIIOP), XML-RPC and Web services (JAX-WS). Performance data was obtained for these approaches based on test results for simple data types under different scenarios, namely, local, remote and remote through firewalls. Overhead analysis has been done to identify root causes of performance overheads. Performance results can be used to make appropriate choices for developing and optimizing mechanisms to large scale distributed computing systems in Java and web services environments. The paper contributes to the overall understanding of different distributed application development approaches in Java that involves simple data types in different circumstances like local, remote, remote over firewalls.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114231608","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: 15
Optimum wavelet design for noise reduction and feature extraction 优化小波设计降噪和特征提取
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392180
B. Molavi, A. Sadr
{"title":"Optimum wavelet design for noise reduction and feature extraction","authors":"B. Molavi, A. Sadr","doi":"10.1109/ISCIT.2007.4392180","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392180","url":null,"abstract":"In this paper an optimum wavelet for denoising and detection applications is designed. The approach is based on searching for a wavelet basis that provides the best non linear approximation of a given signal. It is shown that such a basis will have the best wavelet denoising performance in the sense of signal estimation error. In addition, such a wavelet can represent the signal more compactly with a few large coefficients which can be considered as the features of the signal. Simulation and experimental results are presented to compare the designed wavelet performance with that of standard wavelets. The optimum wavelet proves effective by providing up to 1.2 dB improvement in the simulations and up to 1dB improvement in the experiments over the same length Daubechies wavelet in denoising signals. The optimum wavelet is also successfully used for extracting specific features which can not be detected by Daubechies wavelet from the experimental signals.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116269506","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 H.264/AVC flexible macroblock ordering based on wavelet-domain partition 基于小波域划分的H.264/AVC柔性宏块排序方法
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392061
Zeng-Yao Lin, C.C. Ho
{"title":"Novel H.264/AVC flexible macroblock ordering based on wavelet-domain partition","authors":"Zeng-Yao Lin, C.C. Ho","doi":"10.1109/ISCIT.2007.4392061","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392061","url":null,"abstract":"H.264/AVC is the latest block-based video coding standard from MPEG and VCEG. It not only provides efficient video coding at various bit rates, but also uses some new error resilience tools. Flexible macroblock ordering (FMO) is one of the new error resilience tools involved in H.264/AVC. Here, we present a novel algorithm, wavelet-based flexible macroblock ordering (WFMO), to adaptively allocate macro blocks into four slice groups based on Discrete Wavelet Transform (DWT), and then adopt unequal error protection to enhance the robustness of the packet carrying the slice group of importance and psychovisual sensitivity Simulations show the proposed WFMO can partition the psychovisiually sensitive slice groups efficiently and keep better subjective video quality under poor network condition.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116631705","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
Implementation and analysis of configurable Real Time Address Trace Compressor for embedded microprocessors 嵌入式微处理器可配置实时地址跟踪压缩器的实现与分析
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392005
Lei Shi, Jun Pang, Siliang Hua, Tiejun Zhang, C. Hou
{"title":"Implementation and analysis of configurable Real Time Address Trace Compressor for embedded microprocessors","authors":"Lei Shi, Jun Pang, Siliang Hua, Tiejun Zhang, C. Hou","doi":"10.1109/ISCIT.2007.4392005","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392005","url":null,"abstract":"Real-Time Address Trace Compression (RTATC) is a very useful method for debugging or analyzing software programs running on a processor-based system. Address trace compression means that the instruction addresses, which are produced in the instruction-fetch stage of the microprocessor, are compressed and out putted for later reconstruction and analysis. This paper presents a kind of RTATC method which includes three phases: branch filtering, address encoding and address compressing. A synthesizable RTL code for this method is constructed and integrated with a DSP&CPU processor to analyze the compressing effect and evaluate the hardware cost. The results show that our hardware is capable of real-time compression and achieving a very high compression ratio.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"42 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113960782","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 discriminant approach to sports video classification 体育视频分类的判别方法
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392081
N. Watcharapinchai, S. Aramvith, S. Siddhichai, S. Marukatat
{"title":"A discriminant approach to sports video classification","authors":"N. Watcharapinchai, S. Aramvith, S. Siddhichai, S. Marukatat","doi":"10.1109/ISCIT.2007.4392081","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392081","url":null,"abstract":"The problem of automating sports video classification is investigated by analyzing the low-level visual signal patterns using autocorrelogram. In this paper, two discriminant techniques are tested, namely, neural network with PCA and support vector machine (SVM), when testing data set is larger size than training data set. Seven different kinds of popularly televised sports are studied, namely basketball, Thai boxing, football, golf, diving, tennis, and volleyball. The experiments were emphasized on classifying video sequences at frame level. Classification results indicated that SVM were more efficient supervised learners than neural network with PCA for classifying sports videos with the classification accuracy of up to 91.09%.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123770990","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
Lane detection for driver assistance and intelligent vehicle applications 用于驾驶员辅助和智能车辆应用的车道检测
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392216
C. d’Cruz, J. J. Zou
{"title":"Lane detection for driver assistance and intelligent vehicle applications","authors":"C. d’Cruz, J. J. Zou","doi":"10.1109/ISCIT.2007.4392216","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392216","url":null,"abstract":"Since the 1990s, there have been various lane detection systems designed to suit various road conditions such as highways, urban and rural roads. Current research has shown to predominantly detect only 1 lane marking set in real time and is unable to provide additional lanes for support in situations such as lane closures, road work conditions and car accidents that may obstruct the driving lane. These driver assistance systems are limited in their ability to assist the driver in these conditions. In this paper we propose a method to determine the markings of 2 lanes which can be used in conjunction with a detection system to detect obstacles present in front of the driver on the road. We first determine a suitable threshold for the perspective image to extract these road markings and signs, then apply morphological transformations to counter possible 'deviations' that may arise in this feature extraction technique. This method provides a robust approach to lane detection and works considerably well in various weather conditions. The resulting images show that the method developed can be used for lane-departure warning, as well as for obstacle detection, in driver assistance.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121459682","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: 36
Iterative frequency domain equalization for DQPSK signals DQPSK信号的迭代频域均衡
2007 International Symposium on Communications and Information Technologies Pub Date : 2007-12-04 DOI: 10.1109/ISCIT.2007.4392127
P. Pedrosa, R. Dinis, F. Nunes
{"title":"Iterative frequency domain equalization for DQPSK signals","authors":"P. Pedrosa, R. Dinis, F. Nunes","doi":"10.1109/ISCIT.2007.4392127","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4392127","url":null,"abstract":"Differentially encoded quadrature phase shift keying (DQPSK) modulation has worse bit error rate than coherent QPSK but on the other hand DQPSK is more robust to carrier frequency offset (CFO) offering a solution to the problem presented by the presence of CFO in wireless communication systems based on block transmission. Iterative block decision feedback equalization (IB-DFE) with CFO estimator proved to be a valid receiver structure for single carrier frequency domain equalization (SC-FDE) combined with QPSK modulations. In this paper we test the natural extension of the IB-DFE receiver for SC-FDE combined with DQPSK modulations in the presence of CFO.","PeriodicalId":331439,"journal":{"name":"2007 International Symposium on Communications and Information Technologies","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125112572","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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