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광학거울 시스템의 지지구조 설계를 위한 라그랑지 방정식과 최적화 기법 적용에 의한 효과분석
김학인,남병욱,김광태,김병운,Gimm, Hak In,Nam, Byoung Uk,Kim, Gwang Tae,Kim, Byung Un 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.3
The support structure of an optical mirror system is the one of the important design elements because the one affects the optical aberrations of the mirror surface. In this paper, Lagrange equation of the moving body of the fast steering mirror system(FSM) has been formulated to use with optimization design. Major goals for optimization are to assign the reasonably flexible stiffness to the structure and to enhance the first natural frequency of the mirror and support system in aid of more affordable control bandwidth for the FSM. Pursuing these purposes with the proposed method, the finite element analysis(FEA), optimization technique and the Zernike polynomial estimation are used for the design effects. It is concluded that the proposed approach for design well guides toward the desired design goals with regards to both structural and optical performances.
김학인 한국지방공기업학회 2006 한국지방공기업학회보 Vol.2 No.1
대구광역시환경시설공단은 대구시의 환경기초시설을 수탁 받아 운영하는 시설운영 지방공기업으로 2005년도 행정자치부 주관 「전국 지방공기업 경영평가」에서 환경시설공단 중 최우수등급인 “가”등급을 획득하였고, 환경부 주관 「전국 하수처리장 운영실태평가」에서 3년 연속 최우수 처리장으로 평가받는 등 선도적인 공기업으로 발전하여 왔다. 이 논문은 대구광역시환경시설공단의 그간 추진성과와 실적에 대한 고찰과 함께 앞으로의 공단이 발전하기 위한 바람직한 발전방향은 무엇인지를 파악하였다. 발전방향을 검토하기 위해 먼저 우리 공단의 외부·내부 환경을 분석하였으며, Mission, Vision 달성을 위한 경영전략, 사업영역 확장, 기술경영개선용역 결과를 활용한 운용효율 극대화, 혁신경영을 통한 공단 효율성 확보방안으로 구분하여 알아보았다. 그러나, 실무적인 입장에서 접근하여 전문성이 부족하고, 검토된 발전방향의 시행을 위해서는 좀 더 깊이 있고 체계적인 논의가 있어야 한다.
김학인 全南大學校 藝術硏究所 2001 藝術論集 Vol.4 No.-
The Music of the Greek is the most important in all antiquity. There are two cults that dominated musical concepts in general : (1) The Apollon cult made use of kithara, and was Characterized by charity of form, purity, and objectivity of expression. (2) The Dionysian cult, on the other hand, used the aulos and was characterized by ecstasy, passion, sensuality, and subjectivity. These two concepts have had varying roles in the subsequent history of oriental music, the former embodied in classical trends and the later in romantic trends. The doctrine of Ethos involved the belief that music has a direct effect upon the soul. The doctrine was established by the Peripatetics and Stoics. The diterming factors in musical Ethos were rhythm, mode, and the instrument employed. Very little is known about Roman music. In general, the Roman were imitators of Greek culture. They developed brass instruments largely for military purposes. The Christian Era in music encompasses the development of monophonic music from about 200 A.D. to about 1300. Sacred and secular melodies continued to develop long after the advent of polyphony. The most significant innovation in the entire history is the advent of polyphony in the 9th century. The polyphonic concept dominates the artistic development of all occidental music. The early states of its development(800-1200) take place in the late Carolingian period and the early Middle Ages. The music of the 12th and 13th centuries is referred to as the Ars Antiqua. This was the time of the late crusades, the building of the great Gothic Cathedrals of Europe.