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Efficient Frequency Management in the IMT-2000 CDMA System
김호,진고환,조철회,차동완,Kim, Ho,Jin, Go-Whan,Cho, Chol-Hoe,Tcha, Dong-Wan The Korean Institute of Communications and Informa 1999 韓國通信學會論文誌 Vol.24 No.12
이 논문은 IMT-2000 CDMA 시스템의 주파수 관리 문제를 다룬다. 다양한 서비스, 상이한 대역폭을 갖는 채널, 중첩셀 구조 등과 같은 시스템의 특성을 검토하여 문제를 정의한다. 고려하는 문제는 제약 최적화 문제로 모형화된다. 제약식은 통화 품질을 만족시키면서 서비스를 수용하는 것이고, 목적식은 가급적 적은 대역폭을 소비하는 것이다. 이 문제를 해결하여 다음과 같은 의사 결정을 하고자 한다. 1) 각 종류의 셀에 어떤 서비스를 할당할 것인가, 2) 각 셀에 어떤 유형의 FA들을 설치할 것인가. 제안된 주파수 관리 정책의 유효성이 실험을 통하여 증명된다. We address the frequency management in the IMT-2000 CDMA system. The system characteristics such as multiple classes of services, multiple kinds of channels with different bandwidths, overlaid cell structure, etc. are examined to make way for the problem definition. The problem is formulated as a constrained optimization model, the objective of which is to consume as narrow bandwidth as possible while satisfying various multimedia demands with required QOSs. A solution algorithm is developed which generates two sets of optimal decisions: 1) which combination of service classes to assign to each cell, 2) which set of frequency channels of varying bandwidths to allocate to each cell. The effectiveness of the proposed deployment policy is demonstrated via computational experiments.
이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
In order to obtain the fundamental data on behavioral hearing capabilities, the hearing indices of coralfish chromis notatus and black rockfish sebastes inermis which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise, 10.0 and 19.3 on the condition of white noise respectively.
이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
In order to obtain the fundamental data on behavioral hearing capabilities. the hearing indices of coralfish chromis notatus and black rockfish sebastes inerms which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise. 10.0 and 19.3 on the condition of white noise respectively.
제주도 연안 갈치 채낚기 어구의 생력화 : 1.연속식 채낚기어구의 모형 실험
서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
The authors carried out a model experiment of continuoius hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with haritail hand line in the coast of Jeju. The results are as follow ; 1.The continuous main line was rotated smoothly by driving roller. 2.The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.
제주도 연안 갈치 채낚기 어구의 생력화 : 1. 연속식 채낚기어구의 모형 실험
서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
The authors carried out a model experiment of continuous hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with hairtail hand line in the coast of Jeju The results are as follow : 1. The continuous main line was rotated smoothly by driving roller. 2. The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.
수중 가청음에 의한 쏨벵이의 청각능력 : 2. 청각 임계비
이창헌,박용석,문종욱,강창익,김고환,서두옥 제주대학교 해양연구소 1999 해양자원연구소연구보고 Vol.23 No.-
수중 가청음은 어군의 행동 제어와 해양목장화에서 음향 순치에 많이 이용되고 있다. 수중 가청음에 의한 어류반응 해석을 하기 위해서는 물고기의 청각능력을 정확히 파악할 필요가 있으며,오래전부터 여러물고기의 청각능력을 관련된 연구가 수행되었다.