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박상윤(Sang-Yun Park),김성균(Sung-Kyun Kim),최종운(Jong-Woon Choi),송오섭(Ohseop Song) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
In this paper free vibration analysis of symmetric and cross-ply elastic laminated shells based on FSDT was performed through discretization of equations of motion and boundary condition. Model of laminated composite shells subjected to a combination of magnetic and thermal fields is developed. These coupled equations of motion are based on the electromagnetic equations (Faraday, Ampere, Ohm, and Lorenz equations) and thermal equations which are involved in constitutive equations. Dynamic characteristic of composite shells for change of magnetic fields is investigated.
CORBA - compliant ORB들간의 interoperability 지원을 위한 IIOP 엔진의 설계
박상윤(Sang Yun Park),이근영(Geunyoung Lee),엄영익(Young Ik Eom) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅲ
객체지향 기술의 발전에 따라 객체에 대한 개방형 서비스를 제공하기 위한 구조로써 CORBA(Common Object Request Broker Architecture)가 정의되었고 CORBA-compliant ORB(Object Requst Broker)들간의 상호연동(interoperability)이 필수적인 객체 서비스의 조건이 되었다. 본 논문에서는 CORBA-compliant ORB들간의 상호연동을 위한 IIOP 엔진을 설계하고, 엔진 구성요소들의 기능에 따른 세부사항을 제안하며, 타 ORB와의 상호연동 시의 동작을 중심으로한 시나리오를 통해서, IIOP 엔진의 각 요소들의 동작원리를 제시한다.
CORBA-compliant ORB들간의 상호연동성 지원을 위한 IIOP 엔진의 설계 및 구현
박상윤(Sang Yun Park),이근영(Geunyoung Lee),엄영익(Young Ik Eom) 한국정보과학회 1998 정보과학회 컴퓨팅의 실제 논문지 Vol.4 No.4
분산 객체지향 기술의 발전에 따라 객체에 대한 개방형 서비스를 제공하기 위한 구조로써 CORBA(Common Object Request Broker Architecture)가 정의되었고 CORBA-compliant ORB(Object Request Broker)들간의 상호연동(interoperability)이 객체 서비스의 필수적인 요건이 되었다. 본 논문에서는 CORBA-compliant ORB들간의 상호연동을 위한 IIOP 엔진을 설계 및 구현하고, 엔진 구성요소들의 기능에 따른 세부사항을 제안하며, ORB 내부의 클라이언트와 서버간 통신과 타 ORB들과의 상호연동시의 동작을 중심으로한 시나리오를 통해서, 본 IIOP 엔진 각 요소들의 동작원리를 제시한다. In the development of distributed object-oriented technologies, CORBA is defined as an architecture for providing open object services and the interoperability between CORBA-compliant ORBs becomes the essential components for object services. In this paper, we present the design and implementation of an IIOP engine for interoperability between CORBA-compliant ORBs as well as for communication between the clients and servers in one ORB environment. We present the details of our IIOP engine components and explain the operation principles of the IIOP engine components through the scenarios of interactions between CORBA-compliant ORBs.
PCVN 시편 파괴인성의 균열 깊이 영향에 대한 Scaling 모델 해석
박상윤(Sang Yun Park),이호진(Ho Jin Lee),이봉상(Bong Sang Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.4
Standard procedures for a fracture toughness testing require very severe restrictions for the specimen geometry to eliminate a size effect on the measured properties. Therefore, the used standard fracture toughness data results in the integrity assessment being irrationally conservative. However, a realistic fracture in general structures, such as in nuclear power plants, may develop under the low constraint condition of a large scale yielding with a shallow surface crack. In this paper, cleavage fracture toughness tests have been made on side-grooved PCVN (precracked charpy V-notch) type specimens (10 by 10 by 55 ㎜) with various crack depths. The constraint effects on the crack depth ratios were evaluated quantitatively by the developed scaling method using the 3-D finite element method. After the fracture toughness correction from scaling model, the statistical size effects were also corrected according to the standard ASTM E 1921 procedure. The results were evaluated through a comparison with the T0 of the standard CT specimen. The corrected T0 for all of the PCVN specimens showed a good agreement to within 5.4℃ regardless of the crack depth, while the averaged PCVN T0 was 13.4℃ higher than the real CT test results.
경계조건에 따른 자기장 및 열하중을 받는 복합재료 원통셸의 진동해석
박상윤(Sang-Yun Park),김성균(Sung-Kyun Kim),최종운(Jong-Woon Choi),송오섭(Ohseop Song) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
In this paper free vibration analysis of symmetric and cross-ply elastic laminated shells based on FSDT with two different boundary conditions(C-C, S-S) was performed through discretization of equations of motion and boundary condition. Model of laminated composite cylindrical shells subjected to a combination of magnetic and thermal fields is developed via Hamilton’s variational principle. These coupled equations of motion are based on the electromagnetic equations (Faraday, Ampere, Ohm, and Lorenz equations) and thermal equations which are involved in constitutive equations. Variations of dynamic characteristics of composite shells with applied magnetic field, temperature gradient, and stacking sequence for each boundary conditions are investigated and pertinent conclusions are derived.