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도플러 중심주파수 변화를 최소화하는 인공위성 자세명령 생성
오시환,이선호,윤석택,김진희 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.4
고해상도 영상획득을 임무로 하는 인공위성은 영상품질 저하를 방지하기 위하여 정밀한 자세명령을 생성해야만 한다. 목표지점의 방향뿐 아니라 지구의 자전 및 편구 효과, 궤도의 이심률 등을 고려하여 자세명령 생성이 이루어져야 하며 탑재체의 종류에 따라서 각기 다른 자세명령이 생성되어야만 한다. 합성개구레이더를 탑재한 위성은 광학 카메라를 탑재하고 있는 위성과는 달리 도플러 중심주파수의 변화가 최소화되도록 위성의 자세명령이 생성되어야 하며 이를 위해 위성의 편향 외에 추가적인 자세명령이 필요하다. 본 연구에서는 도플러 중심주파수의 변화를 줄이기 위한 몇 가지 알고리즘의 성능을 모의실험을 통해 비교하여 보았다. Yaw and/or pitch steering attitude command is required to prevent the high quality image product from performance degradation due to not only Earth rotation but also Earth oblateness and orbital eccentricity. Yaw and/or pitch steering compensation is basically needed both for an optical camera and SAR payload, however the reason and the resulting steering profiles are different from each other, even though they have an identical geometry and orbit. The steering profile should be generated by minimizing the Doppler centroid variation For SAR satellite. In this study, a mathematical model and a simulation environment are built and several steering algorithms are analyzed and evaluated via computer simulation.
오시환,안강식 진주여자전문대학 1993 論文集 Vol.16 No.-
As stated above, I considered the multifarious point of views with respect to the concepts of social welfare and then tried to integrate the vertical and horizental concept of social welfare. However, The concept of social welfare is multidimentional and unclear. Social welfare could be divided two defintions. One is broad defintion. The other narrow. I mean that the broad definition is to make a body politic improve the level of welbeing of all people by systematizing the goal concept-thoughts, ideas, philosoph, and values of social welfare-with the mean concept-policys, plans, programs, actions, services of social welfare. Also I mean thatt the narrow definition is to make a body politic promot the level of the specific people regardless of systematizing the broad concept and narrow one. To keep the conceptual confusion of social welfare first of all, I think that the students of social welfare must use the more concrete concept of social welfare than the abstract one of it by differing the broad concept from the narrow concept.
오시환,윤석택,윤형주,김진희,O, Si-Hwan,Yun, Seok-Taek,Yun, Hyeong-Ju,Kim, Jin-Hui 한국천문학회 2012 天文學會報 Vol.37 No.2
인공위성의 자세 제어 및 자세 결정에 사용되는 센서들의 정렬오차는 자세명령생성 오차, 자세제어 오차, 자세결정 오차 등과 더불어 지향정밀도를 저하시키는 하나의 요인으로 작용한다. 본 연구에서는 자이로 센서에만 정렬오차가 존재한다고 가정하는 상황에서 별추적기와 자이로 센서를 이용한 자세결정 필터에 의해 추정되는 자이로 바이어스 값만을 이용하여 자이로 센서의 정렬오차를 확인(Identification)하는 방법 및 결과에 대해 기술한다. 이를 추정하는 다른 방법으로는 여러 가지가 있으며 대표적으로 위성의 다축기동 정보를 입력으로 사용하는 확장칼만필터를 이용한 궤도상 보정(On-orbit Calibration) 방법이 있으나 본 연구에서는 위성의 기동 또는 많은 계산량을 소모하지 않고 비교적 간단하게 자이로 정렬오차를 추정하는 방법을 제시하였다. 그리고 실제 궤도상 위성의 거동 데이터를 이용하여 제안한 방법의 효율성을 검증하였다. 결과적으로, 제안된 방법을 이용했을 때 소수점 둘째 자리 이하의 정확도를 가지고 정렬오차가 추정됨을 확인하였다.
오시환,안강식 진주여자전문대학 1994 論文集 Vol.17 No.-
As stated above, I explained the various theories of oututs of welfare policy which had been developed in Europe:Convergency theory, monopolistic capitalism theory, political pluralism theory, class conflict politics theory. Convergency theory and monopolistic capitalism theory put emphasis on economics and the other theories emphasize politics.
吳時煥,李俊 진주여자전문대학 1991 論文集 Vol.14 No.-
An inequal growth among regions is pointing out one of the very serious social problems in the Korea of today. A purpose of this thesis, after analize relations among changes of industrial structure, population distribution·movement, a group of policy maker, puts emphasis on proofing that these factors are really connected with inequal growth among regions. Analytic technique that is useing in this thesis is a Correlation research, and results of analysis are following. ⅰ) An industrial structure and population distribution·movement are connected with each other closely. ⅱ) Propensity for regionalism of a growp of policy maker is showed strongly, and this propensity brings about inequal growth among regions connected with changes of industrial structure. ⅲ) In the case of dividing into 5 sphers our country, there is proofed that the National Capital region contains great variety of factors that are able to grow, and next by order of following Yeongnam region, Choong cheong region, Kangweon region and Honam region.
吳時煥 진주여자전문대학 1991 論文集 Vol.14 No.-
The national development plan in earnest had been carried out under guidance of administrative branch since the 1960's and as a result, high guowth of ecanomy had been accomplished in korea. But the regional inequal developoment has been made a subject of discussion as one of the social problem at the latest. Therefore, first of all, general types of regional development theory have been looked about in this thesis for searching its cause. Generally, top-down development paradigm and bottom-up development paradigm as a regional development theory have been debated and the main current as a theory of developing countries has been a top-down development paradigm. For instance in korea, in the case of checking up on situation since the 1960's, it has not been gotten over a general mode of developing coumtries therefore, Korea fixed upon top-down development paradigm as a regional development theory. This has been primary cause bring along inequal development among legions in korea. As a result, for equal developoment among legions in future, I consider that it will better be examined, introduced a endogenous regional development theory cautiously.