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마이크로스트립 직사각형 패치 안테나의 접지면 크기에 따른 특성 변화
최형석,황희용 강원대학교 정보통신연구소 2010 정보통신논문지 Vol.14 No.-
본 논문은 접지면의 크기에 따른 마이크로스트립 직사각형 패치 안테나의 특성변화를 알아보았다. 제작된 마이크로스트립 직사각형 패치 안테나는 중심주파수 2.45 GHz으로 설계하였고, FR4(t=0.762 mm,εr=4.4, tanδ=0.025)기판을 사용하였다. 접지면의 크기에 따른 중심 주파수와 입력 포트에서 안테나를 바라본 임피던스는 크게 변화 하지 않았다. 반면에 접지면이 커질수록 반전력 빔폭의 각도는 커졌으며 방사 효율은 일정한 크기에서 포화하였다. 최대 이득은 일정한 크기에서 가장 큰 값을 얻음을 확인할 수 있었다. 시뮬레이션 결과를 바탕으로 최대 이득을 가지는 마이크로 스트립 직사각형 패치 안테나를 설계하여 반사손실과 최대 이득, 방사 패턴을 비교하였다.
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造景業의 發展科程 및 展望 : 造景工事 實積을 중심으로
최형석 수원대학교 산업기술연구소 1990 산업기술연구소논문집 Vol.5 No.-
This study intends to analysis the development of Landscape Architecture in the actual results of construction works and have a view of the Landscape Architecture with regard for the change of internal and external problems. The results of the analysis are summarized as follows; 1. The sites of the construction works and the offices have been located only in 2-3 areas. 2. The constructions by the private have been increased, but the government offices have taken possession of most constructions. 3. The scale of the constructions has been very small, so in most construcions private contracts have been made. The internal and external problems that are expected to exert dierct and indierct effects upon the future of Landscape Architecture are lifting the ban on the licance, opening to the forgeign companies and beginnmg local self-government.
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최형석 수원대학교 1996 地域社會開發 Vol.8 No.-
Many approaches for historic lanscape preservation have been suggested, and among them, the restriction of building heights around historic landscape has been expected to be neccesary for area-wide preservation. Though the Korean institutional arrangement for area-wide preservation around historic landscape has been multipled and broadened till these days, there are some issues to be addressed. This study aims, first, to map the domestic systems for the restriction of building heights around historic landscape, second, to introduce and analysis the existing studies on criteria of building heights for historic landscape, and finally, suggest future approaches for the improvement of the system.
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城廓周邊公園의 利用特性 및 利用 滿足度에 관한 硏究 : 水原市를 중심으로
崔亨碩 수원대학교 1992 地域社會開發 Vol.4 No.-
This study aims to identify the characteristics of parks(including park-users) around castles and to investigate the factors and variables which significantly effect on users' satisfaction with the facilities of parks in Suwon. The questionnaire answered by 300 users of the 3 parks(Paldal, Jangahn, Dong) were analyzed by SPSS-PC^* and the methods of frequencies(user satisfaction), factor analysis and multiple regression analysis (effects on user satisfaction) were used. The results are as follows. 1. The usres' characteristics are differrent fron the indeces of park planning which were made out at the beginning. 2. The 3 parks are considered as more than neighborhood unit park in accessibility, and the presence of castles has an more impertant effect upon the users than any other reasons. 3. The factor analysis identified that four factors were involved in satisfaction with park facilities and the most important factor was 'static space and its environment' such as distribution of plant, surounding landscape, conditions and atmosphere of pedestrian walks and conditions of lighting. 4. Among 13 variables, distribution of plant, number and position of convinient facilities, state of castle preservation and extent of use of castle were identified as important variables whicg significantly effect on overall satisfaction.
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최형석,이호우 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.1
This paper considers an M/G/1 vacation system in which the server takes two different types of vacations under some probabilistic choice. When the system becomes empty, the server leaves for a vacation of random length V with probability p or leaves for a vacation of random length U with probability 1-p. If he finds at least one customer, when lie returns from a vacation, he begin to serve. If no customers are waiting, he leaves for another vacation. We derive the system size distribution and the waiting time distribution by defining supplementary variables. Also we show that the decomposition property .holds for this probabilistic vacation system.
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사료내 한방약제 추출물 첨가가 과밀사육환경 하에서의 육계의 성장과 면역세포 증식에 미치는 영향
최형석,김기현,박상훈,남인식,황성구,남기택,Choi, Hyoung-Seog,Kim, Ki-Hyun,Park, Sang-Hoon,Nam, In-Sik,Hwang, Seong-Gu,Nam, Ki-Taeg 한국유기농업학회 2010 韓國有機農業學會誌 Vol.18 No.3
본 시험은 한방약제 추출물 급여가 과밀사육 환경에서의 육계 (Ross broiler)의 생산성 및 면역세포 중식에 미치는 영향을 조사하기 위하여 실시하였다. 육계 수컷 240수를 저밀도 사육구와 고밀도 사육구로 나누어 각각 대조구와 처리구를 두었으며 저밀도 사육구는 pen 당 10수씩 고밀도 사육구는 pen당 30 수씩 임의 배치하였다. 저밀도와 고밀도의 대조구 사료에 한방약제 추출물 0.23%(AP 0.2%+ DFP 0.03%)를 첨가 급여였다. 사육밀도에 따른 평균 사료섭취량은 저밀도 사육구에 비하여 고밀도 사육구에서 유의하게 낮게 나타났으며(p<0.05), 한방약제 추출물 첨가에 따른 영향은 없었다. 사육밀도에 따른 평균 체중은 고밀도 사육구에서 저밀도 사육구보다 유의하게 낮게 나타났으나(p<0.05), 저밀도와 고밀도 사육구 모두에서 한방약제 첨가 처리구가 대조구에 비하여 통계적 유의차는 없었으나 일당증체량은 개선되는 경향을 나타내었다. 과밀사육에 의한 증체량 감소 및 사료섭취량 감소 현상은 생육 중기에 주로 나타난 결과 이며 후기에는 이러한 환경에 적응하여 회복되는 것으로 나타났다. 사료요구율은 한방약제 첨가 처리구가 고밀도 사육구 및 저밀도 사육구에서 유의한 차이는 없었으나 모두 개선되는 경향을 보여 주었다. 면역세포증식은 비장세포 종식도, LPS로 자극시킨 B세포 증식도와 ConA로 자극시킨 T세포 증식도 모두에서 한방약제 추출물 처리구에서 유의한 차이를 보이며 높은 증식도를 나타내었다(p<0.05). 결과적으로 고밀도환경하에서 한방약제 추출물 급여에 따라 육계의 면역력이 증가한 것으로 판단되며, 궁극적으로 육계의 질병예방 및 일부 생산성 향상에도 긍정적인 영향을 미칠 수 있을 것으로 판단된다. This experiment was conducted to investigate the effects of dietary supplementation of oriental herb extracts (Alpha $Plus^{(R)}$ (AP)+Dried Foxglove Powder (DFP)) on growth performance and proliferation of splenocytes in broiler chicken raised under low or high density stocking conditions. A total of 240 male broiler chicks were randomly divided into four treatment groups with three replicates composed of ten birds in low density stocking groups and thirty birds in high density stocking groups. The four treatment groups were as follows: Cl (low density without AP and DFP); T1 (low density with AP 0.2% and DFP 0.03%); C2 (high density without AP and DFP); T2 (high density with AP 0.2% and DFP 0.03%). The feed intake of the high density stocking group was significantly lower than that of low density stocking groups during overall experimental period (p<0.05). The body weight of high density stocking groups was lower than that of low density stocking groups (p<0.05). The decrease of feed intake and body weight gain in growing stage (7~25day) under the high density stocking condition seems to be recovered in final stage (26~34day). Meanwhile dietary supplementation of AP+DFP in low and high density stocking groups tended to have higher daily body weight gain than control groups. The proliferation of splenocytes in treatment groups was significantly higher than control groups (p<0.05). In conclusion, the result of the present study suggested that the oriental herb extracts (AP+DFP) could be used as an alternative feed additive resources to improve growth performance and immune activity in broiler chickens.
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