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정경훈,김강수,박근배 한국전산구조공학회 1997 한국전산구조공학회논문집 Vol.10 No.4
이 논문은 압축성 유체로 채워진 원통형 탱크의 고유진동 특성을 파악하기 위한 해석적 방법을 제시하고 있다. 탱크의 동적거동은 유한 Fourier 급수전개 방법으로 전개하였으며, 압축성 유체는 선형 포텐셜 이론으로 전개하였다. 해석방법의 타당성을 검증하기 위하여 물로 채워진 양단고정의 경계조건을 갖는 원통형 탱크의 고유진동수를 해석적 방법으로 구한 다음, 상용 유한요소해석 프로그램인 ANSYS 5.2를 이용하여 검증하였다. 그 결과, 유한요소해석결과와 이론적인 방법으로 구한 이론해가 잘 일치하고 있음을 확인하였다. 또한 유체의 밀도와 압축성이 탱크의 고유진동수에 미치는 영향을 정규화된 무차원 고유진동수를 통해서 평가하였다. 유체의 밀도는 탱크의 모든 진동 모드의 고유진동수에 영향을 주지만, 유체 압축성의 영향은 저차 원주방향 모드의 진동수에서 더 크게 나타나고 있음을 확인할 수 있었다. This paper presents an analytical method for evaluating the free vibration of a circular cylindrical tank filled with bounded compressible fluid. The analytical method was developed by means of the finite Fourier series expansion method. The compressible fluid motion was determined by means of the linear velocity potential theory. To clarify the validity of the analytical method, the natural frequencies of a circular cylindrical tank with the clamped-clamped boundary condition, and filled with water, were obtained by the analytical method and the finite element method using a comercial ANSYS 5.2 software. Excellent agreement on the natural frequencies of the liquid-filled tank structure was found. The compressiblity and the fluid density effects on the normalized coupled natural frequencies were investigated. The density of fluid affects on all coupled natural frequencies of the tank, whereas the compressibility of fluid affects mainly on the natural frequencies of lower circumferential modes.
Fine Structural of the Hemopoietic Tissues in the Mealworm Beetle, Tenebrio molitor
정경훈,문명진 한국곤충학회 2004 Entomological Research Vol.34 No.2
The fine structure of the hemopoietic tissue and its detailed reticular organization inthe mealworm beetle, T. molitor were examined using light and scanning electron microscopes.The major hemopoietic tissues in the abdomen were located on the upper surface of the dorsal diaphragmwhich continuous over the ventral wall of the heart. Histologic characteristics of this hemopoietictissues are dense clusters of cells. They are irregular in outline and are not surrounded byany connective tissue sheath. The hemopoietic tissue of this insect is consisted of three cellularcomponents which are the reticular cells, hemocytic stem cells and several kinds of mature hemocytes.The reticular cells had numerous cytoplasmic processes and forming a complex network.The stem cells give rise to differentiating hemocytes of the different cell lineages. Mature hemocyteswithin this hemopoietic tissue are originated from the stem cells and differentiated into severaltypes of hemocytes including prohemocytes, plasmatocytes, and granulocytes.
고속액체크로마토그래피를 이용한 항원충제 분석법 개발: 톨트라주릴 및 디클라주릴
정경훈,정미영,박해철,아킬후세인,김대균,이광직,강정우,Jeong, Kyung Hun,Jeong, Miyoung,Park, Hae-Chul,Hossain, Md Akil,Kim, Daegyun,Lee, Kwang-Jick,Kang, Jeong Woo 대한수의학회 2017 大韓獸醫學會誌 Vol.57 No.4
This study was undertaken to develop new analytical methods for assessment of anticoccidials. High-performance liquid chromatography (HPLC) was found to be a fast, reliable, and practical method. The anticoccidials used in this experiment were toltrazuril and diclazuril, and the analysis factors were specificity, linearity, accuracy, repeatability, and intermediate precision. The linearity of each anticoccidial was better than 0.99, and the accuracies were 99.5% and 99.1% with relative SD of 0.5 and 0.4, respectively. To assess whether the developed HPLC method could be effectively applied, toltrazuril and diclazuril post-market veterinary products (five products) that are currently sold were tested. The results revealed no non-compliant items and the method was applied successfully. Therefore, the newly developed HPLC method for anticoccidial assessment described in this study may be useful as a reference method in the Korean Standards of Veterinary Pharmaceuticals for the analysis of toltrazuril and diclazuril.