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네트웍 트래픽 관리를 위한 데이터 웨어하우스 시스템 구현
윤상의,유흥렬 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1
A data warehouse is a repository of information integrated from several, heterogeneous, operational databases. Data warehouses are usually dedicated to the processing of data analysis and decision support system (DSS) queries. Although diverse tools are used in network traffic management, network managers should undergo several steps to get necessary information because manual works still take a major part in handling traffic management. This paper presents design and implementation of a data warehouse system for managing network traffic data consistently and providing a useful information to network mangers quickly.
Code Division Multiplexing based MIMO Channel Sounder Architecture utilizing Chaotic Sequence
Minjae Kim,Hyoungsuk Jeon,Heung-Ryeol You,Hyuckjae Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we propose a novel MIMO channel sounding architecture by using chaotic sequence instead of PN sequence in conventional sounder.
Byung Moo Lee,Heung Ryeol You,Hyun Beom Lee,Jung Joon Kim,Sang Hong Lee 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Adjacent channel interference is one of se-rious problems in wireless communication systems, and various researchers have been analyzed and/or developed related technologies to avoid and/or suppress it. In future wireless communication technologies, flexible communi-cations, like congitive radio, would be one of main trends. In this situation, simple and fast analysis of adjacent chan-nel interference gives a lot of benefit, because it makes real-time parameter adjustment possible to cope with flex-ible communications. Keeping this in mind, in this paper, we present simple BER perforamance analysis of adjacent channel interference. We regard adjacent channel inter-ference as AWGN and simply add with another AWGN, communication noise. Obviously adjacent channel inter-ference is also affected by fading channel, like transmit signal. We show that, in Rayleigh fading channelwith zero mean and unit variance, we don’t need to concern about fading of adjacent channel interference. The validity of our analysis is tested by simulations.