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      • KCI등재

        원형어레이에서의 새로운 어레이 공분산 행렬 추정 방법

        김영수,김영수,김창주,박한규,최상삼 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.7

        In this paper, we present a performance improvement method for the direction-of-arrival (DOA) estimation algorithm of the narrowband signals incident on a uniform circular array. It is very important to estimate the covariance matrix effectively because the performance of DOA algorithm mainly depends on the exactness of the sampel coveriance matrix which is computed from the received samples of signals. In case of uniform circular array with the even number sensors, the structure of the arrray has a useful geometrical property. Therefore we present the method which can estimate covariance matrix more effectively using this property. The simulation results are shown to demonstrate the superior perfodrmance obtained by the proposed covariance matrix estimation method relative to that of the conventional estimation method.

      • SCOPUSKCI등재
      • KCI등재

        가상확장 어레이를 이용한 공간스펙트럼의 분해능 향상

        김영수,김영수 한국전자파학회 2000 한국전자파학회논문지 Vol.11 No.8

        본 논문에서는 임의 배열 안테나에 입사하는 다중 협대역 인코히런트 신호를 분리 추정하기 위한 분해능 향상 알고리즘을 제안한다. 도래각 추정 알고리즘의 분해능은 배열 안테나 개구면의 크기에 좌우되므로 분해능을 좋게 하기 위해서는 개구면을 크게 해야 한다. 그러나 실환경하에서 배열 안테나의 개구면 크기를 증기시키는 것은 비 실용적이므로 배열 안테나의 센서간격을 가상적으로 확장시킴으로서 개구면의 크기를 증가시키고 적절한 변환 행렬을 사용하여 이 가상 배열 안테나의 스티어링 행렬을 구하는 방안을 제시한다. 시뮬레이션을 통하여 비교분석한 결과 등간격 협대역 인코히런트 신호가 원형배열 안테나에 입사되었을 경우에 제안된 방법이 표준 MUSIC보다 뛰어난 분해성능을 보여주었다. In this paper, we propose a resolution enhancement method for estimating direction-of-arrival (DOA) of narrowband incoherent signals incident on a general array. The resolution of DOA algorithm is dependent on the aperture size of antenna array. But it is very impractical to increase the physical size of antenna array in real environment. Therefore we propose the method that increases the aperture size by virtually expanding the sensor spacing of original antenna array and then construct the steering matrix of the virtual array using the proper transformation matrix. Superior resolution capabilities achieved with this method are shown by simulation results in comparison with the standard MUSIC for incoherent signals incident on a uniform circular array.

      • 地域農業育成을 위한 農漁民自律事業의 重要性

        김영수 全南大學校 農漁村開發硏究所 1994 농어촌개발연구 Vol.29 No.-

        To overcome the crisis of Agriculture, it must increase the international competitive power and stress the rearing of regional agriculture which makes the regional specialization in producing like international division of agriculture. As a trial they drive Farmer’s Autonomous Project and this study’s aim is the seeking of the efficient drive way of it. This study is examined the relationship between Farmer’s Autonomous project and New Agricultural Policy, detected the details, charicteristics, of the problems Farmer’s Autonomous Project and found out the efficient drive way of it. Stressed the Farmer’s Autonomous Project is subjected to farmer or farmer's group. In New Agricultural Policy, the way to solve the problems of agriculture and farming villages is likely to put an emphasis on rearing the market farming, the farming corporate organizations, a small number of the best farmers. But due to agriculture has it’s own weakness, it is influenced by natural and regional conditions of location. So Farmer’'s Autonomous Project shoud be made by regional farmers because they knew about their region’s charcteristics. Farmer’s Autonomous Project must drive by a small number of the best farmers with the regional farmer rather than by the market farming or the farming corporate organizations. And through it reigional unit’s competition must be made. The problem of Farmer's Autonomous Project is a loan and a expenses which charges to the farmers. This disturbs the liberalization of Agricultural Policy. As a result, the Farmer’s Autonomous Project must drive by a small number of the best farmers and successors linking regional farmers in the crisis of agriculture.

      • 跆拳道의 體系的 考察(Ⅳ) : 國民學校 敎育課程을 中心으로 Especially Centered on the Primary School Curriculum

        金永洙 대구교육대학교 1976 論文集 Vol.12 No.-

        The results of a study on the instruction and learning of Taeqwondo are as follows: 1. 68% of all the primary school in Koung Bug areas does not at all instruct the skill of Tae(wondo to the children. 81% of the schools in which Taeqwondo is not practiced does not know about the technique of Taeqwondo only 2% observes the guiding principle as stated in the curriculum while 98% does not. 2. Training of instructors is imperative. 3. The head teacher of physical education shows much concern on its curricular operation while the classroom teacher has litter interest in it. This hinders the development of Taeqwondo.

      • 農道全南 農業의 進路에 關한 硏究

        金映秀,金浩,曺彰浣 全南大學校 農漁村開發硏究所 1992 농어촌개발연구 Vol.27 No.-

        Korean agricultural problem seems to be result from relative stagnation of growth in developing economic process rather than it comes from weakness in agricultural structure itself. So Korean people think serious Korean agricultural problem of a destiny. Futhermore confronting about agricultural problem which is more difficult digresses from solving agricultural problem itself reasonably and makes with political issue. In this point of view this paper makes several counterproposal about Korean agriculture's future by reexamining and analyzing characteristics and problems of Korean agriculture, including Chonnam agriculture. Especially, between the process of high industrialization and the opening process of agriculture market, instability of agricultural price and this causes instability of farm income and again, this causes instability of agricultural product supply and at last it makes agricultural problems repeat. Even this phenomenon causes low production, cost push, low quality, the weakness of international competitive power and inefficient use in limited resources, etc. Therefore the basic way which solves essentially all this problems is raising commercial farmer, improving agricultural structure which can gives income incentives to farmer constantly and developing regional agriculture through regional specialization of farming. Agricultural specialization which follows regional characteristics has a relative advantage not only increasing production, producing high quality products and cost down but also position of regional agriculture in among regions' competitions, international competitive power and inefficient use in limited resources, etc. Therefore the basic way which solves essentially all this problems is raising commercial farmer, improving agricultural structure which can gives income incentives to farmer constantly and developing regional agriculture 소개호 regional specialization of farming. Agricultural specialization which follows regional characteristics has a relative advantage not only increasing production, producing high quality products and cost down but also position of regional agriculture in among regions' competitions, international competitions. As a result, the solution of agricultural problem is a stablization in agricultural supply by raising regional agriculture stably and that stablizes price of agricultural products at a low level and that makes farm income stable and that makes agricultural resources more efficient.

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