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디지털 위성 방송을 위한 이동체의 위성 지향 알고리즘에 관한 연구
김기열,김성회,박종국 慶熙大學校 材料科學技術硏究所 1999 材料科學技術硏究論集 Vol.12 No.-
To receive satellite broadcasting data in vehicle, it is inevitable to have active antenna control system, which traces the satellite in real time. In this paper, it is proposed the real time algorithm for pointing satellite. Earth geostationary satellite is stationary in the sky. However, looking relative view in space, geostationary satellite seemed to move around earth with speed. Therefore, it is needed the fast and accurate satellite pointing algorithm. Applying the Newton's law of motion and Kepler's the second law, the proposed algorithm derives the angle of azimuth and elevation for vehicle. And it is preferred the Euler's roll, pitch and yaw system Ⅲ to represent vehicle's motion. The effectiveness of proposed algorithm was proved by the simulation.
김정수,김성지,구태회 경희대학교 한국조류연구소 2002 연구보고 Vol.8 No.1
본 연구는 광덕산 일대의 서식지에 따른 조류분포에 관한 연구로서 1997년 4월부터 10월까지 모두 7회 조사하였다. 광덕산 일대에서 관찰된 조류는 총 47종 677개체이며, 우점종은 박새 Parus major (14.18%), 붉은머리오목눈이 Paradoxornis webbiana(13.15%), 까치 Pica pica(9.16%), 직박구리 Hypsipetes amaurotis(5.47%) 순이었다. 농경지 및 개활임지에서 관찰된 조류는 29종 249개체이며, 이중 우점종은 붉은머리오목눈이(24.90%), 박새(15.26%), 오목눈이 Aegithalos caudatus(13.25%)였다. 계곡지역에서 관찰된 조류는 41종 428개체로서 박새(13.55%), 까치(8.41%), 직박구리(8.41%) 등이 우점종들이었다. This survey was conducted during April-October 1997 at the Mt. Kwangduk in Kyanggi-do, Korea. The total of 47 species and 677 individuals were recorded. The dominant species was Parus major (14.18%), Paradoxornis webbianus (13.15%), Pica pica (9.16%). On the cultivated area or open field, a total of 29 species and 249 individuals were sighted among which dominant species were Paradoxornis webbianus (24.90%), Parus major (15.26%), Aegithalos caudatus (13.25%). In the valley area, a total of 41 species and 428 individuals were sighted, among which dominant species were Parus major (13.55%), Pica pica and Hypsipetes amaurotis (8.41%).
한국산 시궁쥐(Rattus norvegicus)와 곰쥐(Rattus rattus)의 mtDNA RFLPs
김회숙,유선아,백상기,김영진 충남대학교 기초과학연구소 1996 忠南科學硏究誌 Vol.23 No.2
RFLPs(restriction fragment length polymorphisms) of mitochondrial DNA(mtDNA) of Rattus norvegicus and Rattus rattus in Korea were observed. All of the mtDNA of R. norvegicus individuals were shown no variatioin by the single digestion with EcoR Ⅰ, Hind Ⅲ, Ksp Ⅰ, Hind Ⅱ and Cfo Ⅰ as well as the double digestion with BamH Ⅰ/Sac Ⅰ or Hpa Ⅰ/Xba Ⅰ. Morph-1(18.75%) and morph-2(81.25%)) were observed by digestion with Hind Ⅱ in mtDNA of R. norvegicus. Morph-1(91.70%) and morph-2(8.30%) were observed by digestion with Cfo Ⅰ in mtDNA of R. norvegicus. In the mtDNA obtained from 3 R. rattus individuals, no variants were observed. The types of mtDNA obtained from 48 R. norvegicus individuals were four types(RN 1, RN 2, RN 3 and RN 4). The frequency of RN 1, RN 2, RN 3 and RN 4 was 66.67%, 14.58%, 6.25% and 12.50%, respectively. The value range of nucleotide diversity in mtDNA of R. norvegicus was between 0.0059 and 0.0153, and the value of nucleotide diversity of mtDNA between R. norvegicus and R. rattus was 0.13. The divergence time between the two species is believed to be 6.5 million years ago.
문성기,김만회 嶺南大學校 工業技術硏究所 1989 연구보고 Vol.17 No.2
Two-dimensional plane stagnation flow is known to be linearly stable to three-dimensional disturbances. This three-dimensional disturbances is propotional to the streamwise-direction distance, not arbitrary disturbances. The purpose of this theoretical study is to show that the same flow destabilized if fluction levels are sufficiently high and arbitrary type. In the present formulation, finite-amplitude disturbances are expanded in terms of the eigenfunctions pertaining to coordinate perturbations. The growing disturbance takes the form of secondary vortice, i.e. vortices more or less parallel to the streamlines. The instability is usually confined to the boundary layer and spacing of the secondary vortices is analysed theoretically for the case of infinitesimal disturbances of the type first sturdied by Gortler and Hammerlin. The third order disturbances grows exponentially above certain critical intensity. The existence of such a threshold is in qualitative agreement with exerperimental studies of secondary vortices arising in flows past blunt bodies.
장창덕,허준,박성환,김철훈,오수진,황희성,최설희,신상훈 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4
Langerhans cell histiocytosis(LCH) appears to arise from Langerhans cell and comprises a spectrum of clinical disease previously described in the literature by a variety of eponyms including histiocytosis X, eosinophilic granuloma, Hand-Christian disease, and Letterer Siwe syndrome. This rare disorder occurs in all groups, predominently affecting children & young adults. LCH has a wide spectrum of clinical features. The differentiation of several forms of this disease is primarily a clinical and not a histologic one. The radiographic characteristics include the appearance of solitary "intraosseous" lesios, the multipicity of "alveolar bone" lesions, the bone lesions, periosteal new bone formation, and slight root resorption. Prognosis of a single bone lesion, is known to be excellent. In contrast, disseminated disease has seen associated with a chronic course, a high rate of morbidity and late consequences, and possible mortality. Treatment of LCH remains problematic. Treatment of multisystem disease, where organ function is being compromised has generally been with high-dose systemic corticosteroids or multiple chemotherapy.
해안리조트 여행객의 정보원천유형에 따른 여행목적지 선택행동에 관한 연구
박인규 ; 김상회 김천대학교 1997 김천대학교 논문집 Vol.18 No.-
오늘날 여행산업의 발전으로 인하여 정보 및 지식을 대량으로 획듣하는 것이 가능하게 되었고 이것이 또한 정보서비스에 대한 수요확대를 초래하여 기술혁신이 새로운 서비스 수요를 창출하고 있다. 또한 여행상품은 무형적, 비가시적인 환상을 구입하는 것이어서 위험지각의 정도가 높고 여행객들의 새로운 목적지 추구성향 등으로 인해 여행객 측면에서도 신중한 의사결정이 요구되어 이 과정에서 문제해결자로서의 역할 수행을 위한 다양한 정보탐색 활동이 요구된다.