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정인수,황영규,Jeong, I.S.,Hwang, Y.K. 대한설비공학회 1999 설비공학 논문집 Vol.11 No.1
A heat transfer analysis for the two-dimensional (2-D) steady state using finite difference method (FDM) is performed to predict the thermal behavior of the primary first-wall (FW) system of fusion reactor under various geometric and thermo-hydraulic conditions, such as the beryllium (Be) armor thickness, pitch of cooling tube, and coolant velocity. The FW consists of authentic steel (type 316 stainless steel solution annealed) for cooling tubes, Cu for cooling tubes embedding material, and Be for a protective armor, based on the International Thermonuclear Experiment Reactor (ITER) report. The present 2-D analysis, the control volume discretized with hybrid grid (rectangular grid and polar grid) and Gauss-Seidel iteration method are adapted to solve the governing equations. In the present study, geometric and thermo-hydraulic parameters are optimized with consideration of several limitations. Consequently, it is suggested that the adequate pitch of cooling tube is 22-32mm, the beryllium armor thickness is 10-12mm, and that the coolant velocity is 4.5m/s-6m/s for $100^{\circ}C$ of inlet coolant temperature. The cooling tube should locate near beryllium armor. But, it would be better for locating the center of Cu wall, considering problems of material and manufacturing. Also, 2-D analysis neglecting the axial temperature distribution of cooling tube is appropriate, regarding the discretization error in axial direction.
MANET에서의 802.11을 적용한 위치기반서비스 프로토타입 디자인
정인수(Insu Jeong),최현준(Hyunjun Choi),정연권(Yeonkweon Jeong),마중수(Joongsu Ma) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
현재 MANET에 관한 대부분의 연구는 라우팅문제에 초점을 맞추고 있다. 하지만 우리는 MANET에서 응용될 수 있는 시스템에 대하여 관심을 갖게 되었다. 특히 셀룰라망(Cellular network)의 단점, 즉 처리량(Throughput)이 낮고 독립적인 망 구축과 데이터 서버로의 접근이 용이하지 않다는 것을 보완하기 위한 802.11기반 위치기반서비스(LBS: Location Based Service)라는 응용 시스템을 제안하게 되었고 MANET에서의 동적 IP 주소 할당과 웹 기반 응용프로그램(Web based application)을 구현하였다. 본 논문에서는 이동적응 망에서의 802.11기반 위치기반서비스에서 필요한 서비스발견(Service discovery)과 등록(Service registration), 동적 IP 주소 할당, 라우팅(Routing)과 웹 기반 응용프로그램(Web based application)을 연동한 시스템 프로토타입을 제안하고 구현한다.
메타-휴리스틱을 이용한 유한구체법의 직접 질량 역행렬법 개발
정인수(Insu Jeong),유민철(Minchul Yu),노건우(Gunwoo Noh) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The method of finite spheres is a kind of non-element method that overlaps spheres of a certain radius in the analysis area without the need to construct a complex grid. When solving the explicit dynamics equation using this MFS, the inverse of the global mass matrix needs to be found, but since the size of the global mass matrix is very large, high computational cost is required to find the inverse matrix. In this case, there is a method to obtain the inverse matrix in the local area instead of in the global area using the direct mass inverse matrix method. In this regard, we will find the appropriate direct mass inverse matrix method and parameters using a meta-heuristic algorithm. We evaluated the superiority of the solution by comparing the accuracy and operation speed of the solution with the existing method when the improved direct mass inverse matrix method is applied.