A hybrid OCDMA/WDMA system is further investigated. We propose an OCDMA receiver design to receive the desired signal with the least interference. Lower probability of error is obtained and better performance can be achieved
{"title":"Receiver design for OCDMA users in a hybrid OCDMA/WDMA system","authors":"Po-Hao Chang, Chi-Yi Liao, Jun-Ren Chen","doi":"10.1109/ICITA.2005.232","DOIUrl":"https://doi.org/10.1109/ICITA.2005.232","url":null,"abstract":"A hybrid OCDMA/WDMA system is further investigated. We propose an OCDMA receiver design to receive the desired signal with the least interference. Lower probability of error is obtained and better performance can be achieved","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"133 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128661494","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626981
V. Ramanathan, K. Mercier, R. Powers, P. Revesz
The human genome project and similar efforts have resulted in the identification of an abundance of novel proteins. There is a need to expedite the process of assigning function to novel proteins. Nuclear magnetic resonance (NMR) spectroscopy can be used to infer a general biological function for a protein of unknown function by identifying compounds that preferentially bind the protein and comparing these results against proteins with defined structure and function. The functional NMR screen generates hundreds of data sets and a manual analysis of these data sets is laborious and time-consuming. It is hypothesized that several sub-tasks of the functional NMR can be automated successfully using an integrated database and data analysis system. Our database system integrates NMR data collection, processing, analysis, and data archiving into a unified user interface. An NMR spectra comparison algorithm is designed and implemented to compare NMR data in the presence and absence of a protein to ascertain if any compound-protein binding occurred
{"title":"Using databases and computational techniques to infer the function of novel proteins","authors":"V. Ramanathan, K. Mercier, R. Powers, P. Revesz","doi":"10.1109/EIT.2005.1626981","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626981","url":null,"abstract":"The human genome project and similar efforts have resulted in the identification of an abundance of novel proteins. There is a need to expedite the process of assigning function to novel proteins. Nuclear magnetic resonance (NMR) spectroscopy can be used to infer a general biological function for a protein of unknown function by identifying compounds that preferentially bind the protein and comparing these results against proteins with defined structure and function. The functional NMR screen generates hundreds of data sets and a manual analysis of these data sets is laborious and time-consuming. It is hypothesized that several sub-tasks of the functional NMR can be automated successfully using an integrated database and data analysis system. Our database system integrates NMR data collection, processing, analysis, and data archiving into a unified user interface. An NMR spectra comparison algorithm is designed and implemented to compare NMR data in the presence and absence of a protein to ascertain if any compound-protein binding occurred","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437364","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626964
Liang Dong
A beamforming approach is developed for mobile wireless systems operated in vehicular scenarios such that the channel undergoes fast Rayleigh fading. In this approach, the downlink beamforming weights of the base antennas are generated based on the orthogonal basis of the uplink signal subspace. The downlink transmission to a particular mobile is through its effective signal subspace via multiple diversity branches. Thanks to the stability of the signal subspace, the received signal strength at the mobile is robust to fast Rayleigh fading. When the distance between the uplink and downlink subspaces is negligible, the open-loop beamforming can be applied to FDD systems. Ray tracing simulations in a three-dimensional urban physical model show that the subspace beamforming enhances the link quality of mobile systems over Rayleigh fading channels
{"title":"Robust beamforming for FDD mobile systems over Rayleigh fading channels","authors":"Liang Dong","doi":"10.1109/EIT.2005.1626964","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626964","url":null,"abstract":"A beamforming approach is developed for mobile wireless systems operated in vehicular scenarios such that the channel undergoes fast Rayleigh fading. In this approach, the downlink beamforming weights of the base antennas are generated based on the orthogonal basis of the uplink signal subspace. The downlink transmission to a particular mobile is through its effective signal subspace via multiple diversity branches. Thanks to the stability of the signal subspace, the received signal strength at the mobile is robust to fast Rayleigh fading. When the distance between the uplink and downlink subspaces is negligible, the open-loop beamforming can be applied to FDD systems. Ray tracing simulations in a three-dimensional urban physical model show that the subspace beamforming enhances the link quality of mobile systems over Rayleigh fading channels","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"430 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133158665","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1627045
A. S. López, A.S. Reza, J. Jurado
This paper shows the adopted strategy to transfer data among multi-platform process information systems. The main characteristics of the strategy for data exchanging, data conditioning, data type conversion and software design are shown. Some of the most important technological challenges that were faced in applying this strategy are related to restrictions in time to transfer a large number of signals from the data generator to other systems, different hardware and software platforms in the systems, keeping the efficiency of processes previously installed, assurance of low use of the capacity of processing power available, robustness and elimination of overload and conflicts to other processes
{"title":"A strategy to share data among multi-platforms process information systems","authors":"A. S. López, A.S. Reza, J. Jurado","doi":"10.1109/EIT.2005.1627045","DOIUrl":"https://doi.org/10.1109/EIT.2005.1627045","url":null,"abstract":"This paper shows the adopted strategy to transfer data among multi-platform process information systems. The main characteristics of the strategy for data exchanging, data conditioning, data type conversion and software design are shown. Some of the most important technological challenges that were faced in applying this strategy are related to restrictions in time to transfer a large number of signals from the data generator to other systems, different hardware and software platforms in the systems, keeping the efficiency of processes previously installed, assurance of low use of the capacity of processing power available, robustness and elimination of overload and conflicts to other processes","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"219 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133317157","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1627033
J. Kite, Leen-Kiat Soh
Event history calendars are a relatively new and useful survey tool for collecting autobiographical and retrospective data. They are much better for this type of data recall than classical question-list surveys. The nature of this type of survey is such that an expert interviewer is needed to guide subjects through the survey process. Because expert interviewers are expensive, the relevance of an intelligent survey assistant in this context is high. We describe an online survey framework programmed as a Java applet. Our framework is built specifically as an event history calendar for the study of tobacco users and their behavior over a six month period. We describe our methods and our modular approach that lends itself to the development of an intelligent survey assistant. We expand on the opportunities for artificial intelligence research within the system
{"title":"An intelligent survey framework using the life events calendar","authors":"J. Kite, Leen-Kiat Soh","doi":"10.1109/EIT.2005.1627033","DOIUrl":"https://doi.org/10.1109/EIT.2005.1627033","url":null,"abstract":"Event history calendars are a relatively new and useful survey tool for collecting autobiographical and retrospective data. They are much better for this type of data recall than classical question-list surveys. The nature of this type of survey is such that an expert interviewer is needed to guide subjects through the survey process. Because expert interviewers are expensive, the relevance of an intelligent survey assistant in this context is high. We describe an online survey framework programmed as a Java applet. Our framework is built specifically as an event history calendar for the study of tobacco users and their behavior over a six month period. We describe our methods and our modular approach that lends itself to the development of an intelligent survey assistant. We expand on the opportunities for artificial intelligence research within the system","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"7 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133077433","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626996
Z. Zhang, J. Liu, C. Wang, K. Sohraby, Y. Liu
In this paper, a new joint frame synchronization and carrier frequency offset estimation scheme in orthogonal frequency division multiplexing (OFDM) systems is proposed. The new scheme needs only one training symbol to perform both frame synchronization and carrier frequency offset estimation, and the carrier frequency offset acquisition range of the new scheme is as large as one half of the total signal bandwidth. It thus realizes high accuracy frame synchronization and carrier frequency offset acquisition simultaneously. Simulation results demonstrate the superiority the proposed scheme in terms of the estimation accuracy of carrier frequency offset
{"title":"Joint frame synchronization and carrier frequency offset estimation in OFDM systems","authors":"Z. Zhang, J. Liu, C. Wang, K. Sohraby, Y. Liu","doi":"10.1109/EIT.2005.1626996","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626996","url":null,"abstract":"In this paper, a new joint frame synchronization and carrier frequency offset estimation scheme in orthogonal frequency division multiplexing (OFDM) systems is proposed. The new scheme needs only one training symbol to perform both frame synchronization and carrier frequency offset estimation, and the carrier frequency offset acquisition range of the new scheme is as large as one half of the total signal bandwidth. It thus realizes high accuracy frame synchronization and carrier frequency offset acquisition simultaneously. Simulation results demonstrate the superiority the proposed scheme in terms of the estimation accuracy of carrier frequency offset","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134198187","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626965
A. Coleman, D. Dampier
Expert witness testimony is an essential factor in computer forensics work. Any computer scientist who engages in computer forensics work may eventually be called upon to testify in a court of law and to render an opinion about computer evidence. This paper outlines issues relevant to computer scientists who may be called upon to perform as an expert witness. Laws, as well as opinions are presented
{"title":"Expert witness: a computer science emphasis","authors":"A. Coleman, D. Dampier","doi":"10.1109/EIT.2005.1626965","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626965","url":null,"abstract":"Expert witness testimony is an essential factor in computer forensics work. Any computer scientist who engages in computer forensics work may eventually be called upon to testify in a court of law and to render an opinion about computer evidence. This paper outlines issues relevant to computer scientists who may be called upon to perform as an expert witness. Laws, as well as opinions are presented","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125187798","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626993
K. Haisch, M. Atashbar, B. Bazuin
This paper describes the development of MATLAB code to find dominant modes of acoustic waves in piezoelectric substrate versus range of velocities that substrate can support. In general, these modes of propagation are Rayleigh SAW, leaky SAW, shallow bulk acoustic wave, and bulk acoustic wave. Because each mode of propagation travels at a different velocity, this program is valuable for evaluating various wave velocities in a particular substrate rotation. The code plots the poles of the complex effective permittivity versus the wave velocity. The pole components (real and imaginary) indicate the wave type, and the magnitude of the poles show which wave is dominant in the particular substrate orientation. Each step of this process is discussed, and the results of the MATLAB program are benchmarked against those of a similar program from Chiba University, Japan
{"title":"Identification of acoustic wave modes in piezoelectric substrates","authors":"K. Haisch, M. Atashbar, B. Bazuin","doi":"10.1109/EIT.2005.1626993","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626993","url":null,"abstract":"This paper describes the development of MATLAB code to find dominant modes of acoustic waves in piezoelectric substrate versus range of velocities that substrate can support. In general, these modes of propagation are Rayleigh SAW, leaky SAW, shallow bulk acoustic wave, and bulk acoustic wave. Because each mode of propagation travels at a different velocity, this program is valuable for evaluating various wave velocities in a particular substrate rotation. The code plots the poles of the complex effective permittivity versus the wave velocity. The pole components (real and imaginary) indicate the wave type, and the magnitude of the poles show which wave is dominant in the particular substrate orientation. Each step of this process is discussed, and the results of the MATLAB program are benchmarked against those of a similar program from Chiba University, Japan","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133877666","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1626995
F. Behmann
The mobile infrastructure market is the second largest wireless communications market and arguably the most challenging. Rapid technology change (2.0/2.5G and 3G) and slow revenue growth turning to declining revenues, have created a difficult environment for companies competing in this market. In contrast, Wi-Fi wireless LAN (802.11x) is a fast emerging, widely deployed technology. Recently, WiMAX, a standards-based (802.16x) technology, has emerged as an alternative to cable and DSL in delivering last-mile wireless broadband access. WiMAX forum-certified systems provide fixed, nomadic, portable, and, eventually, mobile wireless broadband connectivity without direct line-of-sight with a base station. Are 3G, Wi-Fi and WiMAX competing technologies? Can they co-exist? Which technology is more cost-effective? Will a convergence take place in the future? This paper takes a closer look at each of these technologies and compares market potentials, deployment costs, potential applications and areas of competitive threat, co-existence, and potential convergence. A summary timeline is presented to compare these three technologies and their impact on key deployments. The paper concludes with examples of efforts taken by operators to deliver what is perceived to be the best, most cost effective solution to customers
{"title":"Impact of Wireless (Wi-Fi, WiMAX) on 3G and Next Generation — An Initial Assessment","authors":"F. Behmann","doi":"10.1109/EIT.2005.1626995","DOIUrl":"https://doi.org/10.1109/EIT.2005.1626995","url":null,"abstract":"The mobile infrastructure market is the second largest wireless communications market and arguably the most challenging. Rapid technology change (2.0/2.5G and 3G) and slow revenue growth turning to declining revenues, have created a difficult environment for companies competing in this market. In contrast, Wi-Fi wireless LAN (802.11x) is a fast emerging, widely deployed technology. Recently, WiMAX, a standards-based (802.16x) technology, has emerged as an alternative to cable and DSL in delivering last-mile wireless broadband access. WiMAX forum-certified systems provide fixed, nomadic, portable, and, eventually, mobile wireless broadband connectivity without direct line-of-sight with a base station. Are 3G, Wi-Fi and WiMAX competing technologies? Can they co-exist? Which technology is more cost-effective? Will a convergence take place in the future? This paper takes a closer look at each of these technologies and compares market potentials, deployment costs, potential applications and areas of competitive threat, co-existence, and potential convergence. A summary timeline is presented to compare these three technologies and their impact on key deployments. The paper concludes with examples of efforts taken by operators to deliver what is perceived to be the best, most cost effective solution to customers","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134556188","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}
Pub Date : 2005-05-22DOI: 10.1109/EIT.2005.1627009
Haowei Bai, David Liljat
Explicit congestion notification (ECN) used with random early detection (RED) is known to reduce delays for low-bandwidth delay-sensitive transport control protocol (TCP) connections by avoiding unnecessary packet drops and retransmissions. However, choosing the optimum values for buffer size and RED parameters is still an ongoing research topic. In this paper, we present a model to determine the buffer size and RED parameters to minimize packet losses at a RED gateway
{"title":"Buffer requirements at ECN-capable RED gateways to minimize packet losses","authors":"Haowei Bai, David Liljat","doi":"10.1109/EIT.2005.1627009","DOIUrl":"https://doi.org/10.1109/EIT.2005.1627009","url":null,"abstract":"Explicit congestion notification (ECN) used with random early detection (RED) is known to reduce delays for low-bandwidth delay-sensitive transport control protocol (TCP) connections by avoiding unnecessary packet drops and retransmissions. However, choosing the optimum values for buffer size and RED parameters is still an ongoing research topic. In this paper, we present a model to determine the buffer size and RED parameters to minimize packet losses at a RED gateway","PeriodicalId":358002,"journal":{"name":"2005 IEEE International Conference on Electro Information Technology","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116082621","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：