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가정변형도 쉘요소를 이용한 보강된 쉘구조의 기하학적 비선형해석
최명수,김문영,장승필 한국전산구조공학회 2000 한국전산구조공학회논문집 Vol.13 No.2
보강된 판 및 쉘구조의 기하학적 비선형해석을 수행하기 위하여, total lagrangian formulation에 근거한 증분 평형방정식을 적용하고, 강도행렬 산정시 회전각의 2차항을 포함시켜 기하학적 비선형 해석시 해의 수렴성을 향상시켰으며, 보강된 쉘 구조의 해석시 보강재를 쉘 요소로 모델링하고 주부재와 보강재의 연결점에서 일반적인 변환관계를 이용하였다. 등매개 쉘 유한요소의 단점인 locking 현상을 극복하기 위하여 가정 변형률장을 적용하여 감차적분 또는 선택적분시 나타날 수 있는 제로 에너지 모드를 제거하였다. 수치해석 예제를 통하여 가정 변형률장에 근거한 쉘유한요소에 대한 효율성 및 적용성을 확인하였다. For non-linear analysis of stiffened shell structures, the total Lagrangian formulation is presented based upon the degenerated shell element. Geometrically correct formulation is developed by updating the direction of normal vectors and taking into account second order rotational terms in the incremental displacement field. Assumed strain concept is adopted in order to overcome shear locking phenomena and to eliminate spurious zero energy mode. The post-buckling behaviors of stiffened shell structures are traced by modeling the stiffener as a shell element and considering general transformation between the main structure and the stiffener at the connection node. Numerical examples to demonstrate the accuracy and the effectiveness of the proposed shell element are presented and compared with references' results.
최명수,문덕홍,정하용 한국전산구조공학회 2003 한국전산구조공학회논문집 Vol.16 No.1
파양한 구조물의 정적해석에서 매트릭스구조해석법은 가상 폭넓게 사용되고 있는 강력한 해석기법이다. 그러나 이 방법으로 많은 수의 자유도를 갖는 구조물을 정확히 해석하기 위해서는 많은 계산 메모리와 빠른 처리 능력을 갖춘 고성능 컴퓨터를 필요로하는 취약점이 있다. 따라서 매트릭스구조해석법으로 많은 수의 자유노를 갖는 구조물을 퍼스널 컴퓨터 상에서 정확히 해석하기에는 곤란한 경우가 많다. 매트릭스구조해석법치 이러한 취약점을 극복하기 위하여, 저자들은 전달강성계수법을 제안한다. 전달강성계수법은 해석대상 구조물에 대한 강성계수의 전달에 기본 개념을 두고 있으am로 퍼스널 컴퓨터에 매우 적합한 해석기법이다. 본 논문에서는 골조추조물에 대한 정적해석 알고리듬을 전달강성계수법으로 정식화한다. 그리고 전달강성계수법, NASTRAN, 매트릭스구조해석법 그리고 해석해에 의한 계산 결과들의 비교를 통해 전달강성계수법의 유효성을 확인한다. In static analysis of a variety of structures, the matrix method of structural analysis is the most widely used and powerful analysis method. However, this method has drawback requiring high-performance computers with many memory units and fast processing units in the case of analyzing accurately structures with a large number of degrees-of- freedom. Therefore, it's very difficult to analyze these structures accurately in personal computers. For overcoming the drawback of the matrix method of structural analysis, authors suggest the transfer stiffness coefficient method(TSCM). The TSCM is very suitable to a personal computer because the concept of the TSCM is based on the transfer of the stiffness coefficient for an analytical structure. In this paper, the static analysis algorithm for frame structures is formulated by the TSCM. We confirm the validity of the TSCM through the comparison of computation results by the TSCM, the NASTRAN, the matrix method of structural analysis and the analytical solution.
면역요법을 받고 있는 알레르기성 비염 환자에서의 혈청내 특이 IgE항체의 변화
최명수,박항,양훈식,김춘길,김훈 중앙대학교 의과대학 의과학연구소 1991 中央醫大誌 Vol.16 No.2
We know that clinical symptoms of allergic rhinitis are improved by immunotherapy but it is very difficult to manifest improvements scientifically. This study was performed to know which immunological parameters were clinically useful to evaluate the effect of immunotherapy. We measured teh clinical symptoms and the changes of serum level of the specific IgE antibody in the patients with allegic rhinitis who had received immunotherapy. The results were as follows. 1. The ratio of male to female was 1.5:1, and mean age was 18.0 years old, and the peak incidence among the age groups was the 2nd decades. 2. Ninety percents of the patients were improved clinically in 24months after beginning of immunotherapy. 3. The index of specific IgE antibodies decreased to 99.74±04.64% of pretreatment level in 1 year of immunotherapy and to 73.50±21.98% in 2 years of immunotherapy.
Max Frisch의 작품「Andorra」에 나타난 眞實의 問題
최명수 대한신학교 1984 논문집 Vol.4 No.-
Die Farbsymbole "Weiβ" und "schwarz" signalisierendie heimliche U¨bereinkunft der ethischen Gegensa"tze "Wahrheit" und "Luge" im Andorranischen. Auch die Kirche Andorras ist nicht so weiβ, wie sie tut. Obwohl der Pater am Tode Andris mitschuldig fu¨hlte weil er die Wahrheit, die er ha¨tte bezeugen ko¨nnen, feige verschwieg, bekalgt er bei seiner Aussage nachher nur, daβ er lieblos und wenig bru¨derlich gehandelt habe, ohne jene Schuld, die ihm all allein geho¨rt, zu erwa¨hnen. Die Schwarzen sind Ausgeburten der in Andorra herrschenden Gesinnungstyrannei. AAndris Tod erlo¨st die widersinnige Einheit von Ohnma¨chtiger Freiheit ma¨chtiger Unfreiheit, nicht in ho¨herer Ru¨hrung der Betrachters;statt dessen lo¨sen sich endgu¨ltig die ungleichen Paarungern auf, so daβ Herrschaft und Fesselung unangefochten siegen. Das Stuck, "Andorra" kapituliert vor der Gewalt. Des Lehrers Wahrheitsliebe zersto¨lediglich Familienkreis, was sie auf dem "Platz von Andorra" nicht retten kann. Zersto¨rt wird nicht nur Andris Menschenwu¨rde, sondern fu¨hrt zum. Tod Andris, Denn "die Wu¨rde des Menschen besteht in der Wahl." Doch die Wahrheit besteht nicht in dem, was an und fu¨r sich ist, sondern in dem, was fu¨r andere bedeutet, namlich was die Umwelt, ihre Instituitionen, Interessen und Affekre als Wahrheit gesetzt haben. Auch der Pru¨fer mit dem untrglichen Auge sieht nicht die Naturhaftbiologosche, sondern die Gesellschaftliche Wahrheit. Auch er sieht nicht so. Andri herkommt, sondern das, was die anderen und schieβlich auch er selbst aus ihm gemacht haben. Die seelenlost Perfektion der Henkershelfers trifft die Wirklichkeit noch am genauesten: Jude ist nicht der, der "Ju¨disches Blut" in seinen Adern hat, sondern der, den seine Umwelt dazu stempein will.
최명수,Takahiro Kondou,Yasuhiro Bonkobara 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.1
A new free vibration analysis method, which is called the Sylvester-transfer stiffness coefficient method (S-TSCM), is developed by combining Sylvester’s inertia theorem and the transfer stiffness coefficient method. In this paper, the free vibration analysis algorithm of a straight-line beam structure is formulated by S-TSCM. From the computation results of the free vibration analysis for the three types of beam structures, we confirm that S-TSCM is a very effective method. In particular, S-TSCM is superior to both the transfer stiffness coefficient method and the transfer matrix method in terms of computational accuracy and time. In the free vibration analysis for the beam structure with a large number of degrees-of-freedom, S-TSCM is superior to the finite element method in terms of computational time and storage.