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확률변수 가중치 환산법 기반 군용 항공기 생존성 분석기법
양주석(Ju-Suk Yang),이경태(Kyung-Tae Lee),지철규(Cheol-Kyu Jee) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.11
군용 항공기의 개발과정 중 전투 생존성 분석은 반드시 거쳐야 할 필수 과정이다. 군용항공기의 전투 생존성 분석을 위한 방법은 M&S 기법 적용이 일반적이며 필요시 최종단계에서 Live Fire Test를 거친다. 본 연구에서는 비용대비 효과도를 고려하여 M&S기법을 통해 개념설계단계에서 신속하게 정성적으로 전투 생존성을 분석할 수 있는 연구를 수행하였다. 본 연구를 위하여 필수사건 및 필수요소 분석기법, 몬테카를로 시뮬레이션 등 확률, 통계기법들을 이용한 ‘확률변수 가중치 환산법’ 알고리즘을 고안하여 제시하였다. Aircraft combat survivability analysis is essential process for the development of combat aircraft. M&S methodology is the typical procedure for the aircraft combat survivability analysis, and the last step is the expensive Live Fire Test if it is necessary. This study introduced cost and time effective survivability analysis methodology based on the random variable weighted score algorithm in conceptual design phase. For this study, essential element and event analysis (E3A) is used to define the random variables and Monte-Carlo simulation is implemented to estimate weighted score and the final value of survivability.
양주석(Ju Suk Yang),이균호(Kyun Ho Lee),정재동(Jae Dong Chung),서승호(Seung Ho Seo),김정태(Jung Tae Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Dissolved Air Floatation (DAF) process is one of sewage/waste water carriage methods. Purifying process is makes floating matter from sewage/waste water and air bubble. This study focused on basic research step to purifying industrial sewage using DAF process. For this study, Computational Fluid Dynamics (CFD) method was used. Commercial CFD software ANSYS FLUENT V.14.5 was used for multiphase flow analysis between sewage and air bubble in this study.
양주석(Ju-Seok Yang),민경호(Kyung Ho Min),우승걸(Seung-Geol Woo),이희범(Heui Bom Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
High pressure die casting is used in manufacture of the various auto parts due to its excellent productivity compared to any other casting processes. However, it has disadvantage which is difficult to form parts having complex inner shape or under-cut shape by its metal mold. To solve this problem, collapsible cores, which can withstand high pressure and speed of the melt flow on casting and easily be removed after casting, have recently been developed. There are three types of them; sand, salt, and plastic core. The purpose of this study is to develop the sand core which is excellent with respect to productivity, cost, and applicability. In this study, cerabeads was used as core sand and its particle size and resin contents were modified to improve shear strength. In addition, two coating agents were applied to the core and their concentration was adjusted. As the results, the core whose shear strength is above 110kgf/㎠ was obtained, and practical high pressure die casting test using it was performed to verify its applicability.
폐와 중추신경계를 침범한 효모균증(Cryptococcosis)
이민수 ( Min Su Lee ),박상선 ( Sang Seon Park ),고영일 ( Young Il Koh ),장안수 ( An Soo Jang ),임성철 ( Sung Chul Lim ),양주열 ( Ju Yeoul Yang ),박형관 ( Hyung Kwan Park ),나현주 ( Hyun Joo Na ),김영철 ( Young Chul Kim ),최인선 ( 대한결핵 및 호흡기학회 1995 Tuberculosis and Respiratory Diseases Vol.42 No.4