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2008 International Symposium on Communications and Information Technologies最新文献

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A Graph-based Methodology for Analyzing Firewall Rules with Services 基于图的服务防火墙规则分析方法
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700210
S. Pipattanasakul, Y. Permpoontanalarp
{"title":"A Graph-based Methodology for Analyzing Firewall Rules with Services","authors":"S. Pipattanasakul, Y. Permpoontanalarp","doi":"10.1109/ISCIT.2008.4700210","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700210","url":null,"abstract":"Configuring firewalls is a difficult task. The reason is that the effects of firewall rules cannot be seen during the configuration time. As a result, errors and loopholes in firewall rules are discovered only at the run time and they often cause attacks. In this paper, we develop a graph-based method for analyzing firewall rules with services. Our new model provides advantages over all existing methods in that it can compute effects of firewall rules at multiple firewalls in an intuitive and efficient way. In addition, it offers a new rule analysis called rule tracking.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134201965","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
Joint Power Allocation for Multi-User Uplink MIMO Transmissions with Imperfect CSI 不完全CSI下多用户上行MIMO传输联合功率分配
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700166
C. Kotchasarn
{"title":"Joint Power Allocation for Multi-User Uplink MIMO Transmissions with Imperfect CSI","authors":"C. Kotchasarn","doi":"10.1109/ISCIT.2008.4700166","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700166","url":null,"abstract":"We investigate the problem of robust joint transmitter and receiver power allocation for uplink multi-input multi-output (MIMO) transmissions. The channel model is assumed to have Rayleigh flat fading. The objective of power allocation is to minimize the total MSE each of which has limited transmit power. The problem is formulated as a non-linear optimization problem. In addition, we investigate robust joint transmitter and receiver power allocation with imperfect channel state information (CSI). The CSI error is assumed to be unknown but bounded by a constant. This problem is formulated as a semidefinite programming (SDP) problem with bilinear matrix inequality (BMI) constraints. Numerical results indicate that, with imperfect CSI, the BER performance improvement obtained by taking robustness into account in the joint power allocation process.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134504173","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
Indirect X-Ray Detector Panel Using Multiple Cameras 使用多个摄像机的间接x射线探测器面板
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700224
K. Hemtiwakorn, N. Srisuk, C. Pintavirooj
{"title":"Indirect X-Ray Detector Panel Using Multiple Cameras","authors":"K. Hemtiwakorn, N. Srisuk, C. Pintavirooj","doi":"10.1109/ISCIT.2008.4700224","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700224","url":null,"abstract":"In this paper, the indirect X-ray-detector panel using an array of digital camera with an intensifying screen is designed. To assist the orientation process, the camera calibration was used to derive the information of how the individual camera is oriented. Salt & pepper noise was removed by the median filtering technique. The border of captured image was transformed and registered by using the template matching with cross correlation, and matrix transformation to obtain the registered images. Moreover, the weighted average technique was used to obtain a smooth image mosaic. Finally, Lambert-Beer law was applied to construct the final detector output. Result shows that the mosaic X-ray detector output is as comparable as that of the single X-ray detector. The panel junction smoothness of the detector output is acceptable and the resolution is significantly improved.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134373442","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
Circularly Polarized Right Angle Slot Antennas for WLAN of IEEE 802.11b/g 用于IEEE 802.11b/g无线局域网的圆极化直角槽天线
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700152
A. Pomsathit, C. Benjangkaprasert, N. Anantrasirichai, V. Chutchavong, T. Wakabayashi
{"title":"Circularly Polarized Right Angle Slot Antennas for WLAN of IEEE 802.11b/g","authors":"A. Pomsathit, C. Benjangkaprasert, N. Anantrasirichai, V. Chutchavong, T. Wakabayashi","doi":"10.1109/ISCIT.2008.4700152","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700152","url":null,"abstract":"In this paper, the design consideration for right-hand (clockwise) and left-hand (counterclockwise) circularly polarized microstrip slot antennas are presented. The circularly polarized antenna consists of two right angle slot antennas that is two orthogonal modes in phase quadrature or an array of linearly polarized slot with proper orientations and phases. This antenna can generate circular polarization by radiating orthogonal field components from two slots with equal amplitude but in phase quadrature. Two orientations for circularly polarized are investigated in this paper from simulation and measurement results are shown at resonance frequency 2.45 GHz on return loss, VSWR and radiation patterns.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134446922","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
An Improvement of Ad Hoc Route Maintenance Ad Hoc路由维护的改进
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700161
A. Otakahn, M. Lertwatechakul
{"title":"An Improvement of Ad Hoc Route Maintenance","authors":"A. Otakahn, M. Lertwatechakul","doi":"10.1109/ISCIT.2008.4700161","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700161","url":null,"abstract":"Ad Hoc wireless network consists of mobile nodes that do not rely on any fixed network infrastructure. The dynamic route is allocated for a pair of nodes by Ad Hoc on-demand routing protocol (AODV), that establishes a route only when a source node want to transmit data. Routes in Ad Hoc network can be broken caused by a node in the route may move out of their neighbor's signal range or node's battery may be ran out. Many algorithms have been developed to solve the problem [1],[6], one of them is break avoidance algorithm (AODV-BA [1]). However, using AODV-BA protocol, an upstream node of the broken link has to buffer packets during the route maintenance process. In case that the route maintenance is unsuccessful, the source node must re-establish a new route. In this paper, we propose AODV Backup Route Discovery with 2 Levels of Threshold (AODV-2T). The protocol tests for the power of its own battery power and its neighbors' RF signal. And it would cooperate with the neighbors to find a backup route as to fix the weak link problem where the first threshold is met. Consequently, if the power of signal or battery is fallen below the second threshold level, AODV-2T node could switch the data packet transmission to the new route without any delay. AODV-2T can reduce connection tear-off that causes packets lost and more routing control overhead by 15-18 percent compared to the original AODV and AODV-BA.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127908725","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
Applied the artificial neural network for reduce the position error on GPS receiver due to ionospheric irregularities 应用人工神经网络减小了电离层不规则性对GPS接收机的定位误差
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700273
S. Nontasud, N. Leelaruji
{"title":"Applied the artificial neural network for reduce the position error on GPS receiver due to ionospheric irregularities","authors":"S. Nontasud, N. Leelaruji","doi":"10.1109/ISCIT.2008.4700273","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700273","url":null,"abstract":"When the GPS signal pass through the ionosphere irregularities effect to rapid fluctuation of signal or scintillation occurred. This effect to the GPS receiver position error. This paper presents the error reduction of GPS receiver due to ionosphere irregularities by artificial neural network. The GPS position error depends on the strength of scintillation which measured in scintillation index or S4 index which due to total electron content (TEC) in the ionosphere. We used the measurement data which include the S4 index to analyze and correct the position error by artificial neural network. The result of this research we found the position error can reduce to less than 1 meter. The positions average close to correct position.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121219430","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 High-Speed Architecture for 32-Bit Binary Coded Decimal (BCD) Multiplier 32位二进制编码十进制(BCD)乘法器的新型高速结构
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700251
S. Veeramachaneni, M. Srinivas
{"title":"Novel High-Speed Architecture for 32-Bit Binary Coded Decimal (BCD) Multiplier","authors":"S. Veeramachaneni, M. Srinivas","doi":"10.1109/ISCIT.2008.4700251","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700251","url":null,"abstract":"With the increasing prominence of commercial, financial and Internet-based applications that process data in decimal format, there is a renewed interest in providing hardware support to handle such data. In this paper, novel efficient parallel architectures for 32-digit binary coded decimal (BCD) multipliers are proposed using novel binary counters, BCD full adders and binary to BCD converters. These binary counters have been designed and used to add the partial products generated during multiplication using a partial product reduction tree. The proposed architecture focuses on using efficient binary architectures to compute BCD products without the loss of accuracy. The existing and proposed architectures have been simulated and compared (both qualitatively and quantitatively) and the results have been mentioned.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128675448","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: 18
Notice of Violation of IEEE Publication PrinciplesDesign of Microwave Filters Using DSP Technique 基于DSP技术的微波滤波器设计
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700272
S. Shrivastava, D. Upadhyay
{"title":"Notice of Violation of IEEE Publication PrinciplesDesign of Microwave Filters Using DSP Technique","authors":"S. Shrivastava, D. Upadhyay","doi":"10.1109/ISCIT.2008.4700272","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700272","url":null,"abstract":"In this paper, a novel method for the design of microwave filters using digital signal processing technique with arbitrary frequency response is presented. It is mainly based on the conversion of the microwave specifications to the digital specification, where the digital filter design technique mainly IIRPNORM algorithm is applied. With the use of digital signal processing techniques, the method calculates the poles and zeros for the analog frequency response that satisfies the given specifications. By the poles and zeros, the microwave filter can be realized using conventional techniques. As an example to demonstrate the proposed technique, a filter with user-defined specifications over two independent passbands has been implemented and this would be tested in microstrip technology.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117121719","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
New Current-Controlled Current-Mode Multifunction Filter Using Translinear Current Conveyors 一种新型电流控制电流型多功能滤波器
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700153
M. Kumngern, N. Napat Sra-ium, K. Dejhan
{"title":"New Current-Controlled Current-Mode Multifunction Filter Using Translinear Current Conveyors","authors":"M. Kumngern, N. Napat Sra-ium, K. Dejhan","doi":"10.1109/ISCIT.2008.4700153","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700153","url":null,"abstract":"A new current-mode universal biquadratic filter with two inputs and two outputs employing only two translinear current conveyors with controlled gain and two grounded capacitors is proposed. The proposed circuit offers the following features: realization of lowpass, bandpass, highpass, bandstop and allpass current responses from the same configuration, no requirements for component-matching conditions, independent current control of the natural frequency and the quality factor, low active and passive sensitivities, minimum active and passive components, high impedance output. The characteristics of the proposed circuit are simulated using PSPICE to confirm the theory.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114110225","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
Improved Sorting Algorithm for Explicit FMO Macroblock Classification in H.264 H.264中显式FMO宏块分类的改进排序算法
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700245
R. Cajote, S. Aramvith, R. Guevara, Y. Miyanaga
{"title":"Improved Sorting Algorithm for Explicit FMO Macroblock Classification in H.264","authors":"R. Cajote, S. Aramvith, R. Guevara, Y. Miyanaga","doi":"10.1109/ISCIT.2008.4700245","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700245","url":null,"abstract":"An improved sorting algorithm is presented that classifies macroblocks into different slice groups for FMO in H.264. The classification process reinforces the slice structured coding nature of H.264 by making a conscious effort to minimize the variations in the statistics of the macroblock parameters of the resulting slice group maps. Results show that modest improvements can be achieved in terms of PSNR and the number of undecodable macroblocks by using the proposed improved sorting algorithm as compared to an interleave sorting algorithm where the MB is assigned to different slice groups following the order of the sorted list.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127045686","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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