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권익노,권택진 한국공간구조학회 2001 한국공간구조학회지 Vol.1 No.2
The structural behaviors of anisotropic laminated shells are quite different from that of isotropic shells, Also, the classical theory of shells based on neglecting transverse shear deformation is invalid for laminated shells. Thus, to obtain the more exact behavior of laminated shells, effects of shear deformation should be considered in the analysis. As the length of x-axis or y-axis is increase, the effects of transverse shear deformation are decrease because the stiffness for the axis according to the increasing of length is large gradually. In this paper, the governing equations for anisotropic laminated shallow shell including the effects of shear deformation are derived. And then, by using Navier's solutions for shallow shells having simple supported boundary, extensive numerical studies for anisotropic laminated shallow shells were made to investigate the effects of shear deformation for 3 typical shells. Also, static analysis is carried out for cross-ply laminated shells considering the effects of various geometrical parameters, e,g., the shallowness ratio, the thickness ratio and the ratio of a(length of x-axis)-to-b(length of y-axis). The results are compared with existed one and show good agreement.
Development a Knowledge-based Medical Diagnosing System for Thyroid Disorders
조권익,김성희,노재범,Cho, Kwun-Ik,Kim, Soung-Hie,Noh, Jae-Bum 대한산업공학회 1990 산업공학 Vol.3 No.2
In this study, we will present a knowledge-based consulting system, called THYCONS, for diagnosing thyroid disorders. It has been developed to make the knowledge and expertise of the human expert more widely available, therefore achieving a high-quality diagnosis. Frames will be used to represent the medical knowledge of thyroid disorders, and several rules are attached in each slot of a frame. The uncertainty of diagnostic processes is manipulated by the subjective Bayesian method under the assumption that the pieces of evidence are conditionally independent. Searching for the group of diagnostic tests to be carried out and their optimum sequences will be established in order to infer a more correct diagnosis on the basis of maximum information gain with cost and time restrictions. Additionally. differential diagnosis will be carried out based on the information gained.
강현진,권익노,김응교,최현식,권태식 대한건축학회 1998 大韓建築學會論文集 : 構造系 Vol.14 No.6
구조요소로 사용되는 원통쉘이 캔틸레버 형태로 지지되는 경우를 탑상형 원통쉘 구조물이라 하며, 이러한 구조물이 횡력을 받게되면 휨, 축력, 면내 전단력 등이 복합적으로 작용하게 되며, 이들 응력상태는 하중조건과 쉘의 형상파라미터, 그리고 기초와의 접합방법등 여러 가지 변수에 의해 서로 다른 양상을 나타낸다. 기존 연구를 통해, 대칭하중을 받는 원통쉘에 대해 서는 상당한 연구 진척이 있었지만, 횡력과 같은 비대칭 하중을 받는 원통 쉘에 대해서는 아직 연구되어야 할 부분이 많다. 따라서, 본 연구에서는 횡력이 작용하는 탑상형 원통쉘에 있어서 그 형상에 따른 응력분포상태를 손쉽게 파악할 수 있는 방법을 연구하는 데 그 목적이 있다. 본 연구에서는 단부하중이 작용하는 원통쉘의 지배 미분방정식을 유도하고, 상단에 수평하중이 작용하는 탑상형 원통쉘에 대한 경계조건을 적용하여, 응력을 계산하는 프로그램을 작성한다. 작성된 프로그램을 통해, 쉘의 형상(두께)에 따른 응력의 분포를 파악하며, 유사한 구조물의 설계 등에서 응력상태를 손쉽게 예측할 수 있는 자료를 제공한다.
Runge-Kutta법을 이용한 축대칭 하중을 받는 직교 이방성 구형쉘의 해석
김우식,권익노,권택진 한국공간구조학회 2002 한국공간구조학회지 Vol.2 No.3
It is often hard to obtain analytical solutions of boundary value problems of shells. Introducing some approximations into the governing equations may allow us to get analytical solutions of boundary value problems. Instead of an analytical procedure, we can apply a numerical method to the governing equations. Since the governing equations of shells of revolution under symmetric load are expressed by ordinary differential equations, a numerical solution of ordinary differential equations is applicable to solve the equations. In this paper, the governing equations of orthotropic spherical shells under symmetric load are derived from the classical theory based on differential geometry, and the analysis is numerically carried out by computer program of Runge-Kutta methods. The numerical results are compared to the solutions of a commercial analysis program, SAP2000, and show good agreement.