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장동주,Jong-Min Lee,Hyun-Suk Nam,NAM-SU HUH,Yun-Jae Kim,Hyeong Do Kweon,김종성 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7
In this paper, strain-based damage assessment based on elastic-plastic FE analysis was carried out for the piping system test under seismic loads conducted at Bhabha Atomic Research Center (BARC, India) to suggest relevant damage evlaution method and cyclic hardening model. For the damage evaluation method, the cumulative plastic damage and cumulative fatigue damage assessment methods, suggested in ASME B&PV Sec. VIII and Sec. III, respectively, were considered. For the FE analysis, hybrid models consisting of the beam and solid elements were used, validated by comparing with the results using full solid models. To simulate the cyclic hardening behavior of the material, the bi-linear kinematic hardening model suggested in the JSME Code case and the Chaboche kinematic hardening model were considered. By comparing with test results, it is shown that predicted failure cycles are about 33~53 % of the test result, and the use of the cumulative plastic damage method is found to be more conservative than the cumulative fatigue damage method. The effect of the hardening model on evaluation results is found to be not so significant.
姙娠된 白鼠 腹腔內로 投與한 Compound 48/80 의 胎子 肥滿細胞에 미치는 影響
張東柱,金正洙,李武三 의과학연구소 1988 全北醫大論文集 Vol.12 No.1
This study was performed to investigate the effect of compound 48/80 on mast cells of the rat fetus. After intraperitioneal injection of compound 48/80 into pregnant rat on the 19th Day of pregnancy, the morphological changes of fetal mast cells were observed in fetal mesentery, diaphragm, and placenta. Results were as followings : 1. Degranulation rates of fetal mesenteric, diaphragmatic, and placental mast cells were significantly increased in compound 48/80 treated group than those of the control group. 2. The degranulation responses of fetal mesenteric and diaphragmatic mast cells to compound 48/80 were dose-dependent. From the above results, it was suggested that compound 48/80 affected to the fetal mast cells by passing through the placental barrier. (Key words : Fetal mast cell, Compound 48/80)
장동주(Jang Dong-Ju),김백기(Kim Baekki) 한국정보기술학회 2016 Proceedings of KIIT Conference Vol.2016 No.6
본 논문에서 제안한 앱을 구현하기 위하여 Eclipse 개발 툴과 Java 언어 및 Android SDK 4.2.2를 사용하여, 로딩화면과 메인 탭 4개로 구성하였다. 로딩화면은 스플래쉬 기능을 이용하여 설계하였으며, 각 탭의 구성으로는 1번째 탭은 날씨, 버스, 명소, 여행일정 버튼 4개로 구성되어 있고, 2번째 탭에는 DB를 이용한 버스의 노선도 및 실시간 현황과 3번째 탭은 행사일정에 대한 탭, 4번째 탭에는 1번째 탭의 여행일정 이미지를 저장하는 기능을 Eclipse로 구현한다. In this paper, we used the Eclipse development tools and Java language and Android SDK 4.2.2 to realize application. It is made up the loading screen and the four main tab. Loading screens were designed using the splash function. In the setting of each tab, the first sheet of the tab is composed of weather, bus, tourist attractions, and four travel schedule button. The second tab is provided with a current route map or real-time bus using DB and the third tab is provided with the events of the Schedule tab. In the fourth tab, the function to store the travel schedule of first tab is implemented with Eclipse.
Development of a Portable Fluorescent Detection Device for Microalgae
장동주(Dongju Chang),조영학(Young Hak Cho),이치범(Chibum Lee) Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.9
Recently, many attempts have been made to use microalgae as raw material for next generation biodiesel. Since conventional microalgae detection is performed in the laboratory after collecting algae in the field, it is necessary to develop a portable fluorescence measuring device that can effectively reduce detection duration in the field. In this study, we developed a portable fluorescence measurement device composed of an optical system and a control system to detect microalgae in the field. The optical system stimulates excitation light suitable for algae to be measured and determines the amount of algae by measuring the amount of emitted light through the PMT sensor. The optical system facilitates seamless change of filters and lenses according to kinds of algae. This was validated by checking the amount of light measured according to concentration of CC125. Reliability of the fluorescence measuring device was verified through repeated experiments.
다양한 유형의 공간객체를 위한 R<SUP>m</SUP>-tree 기반의 mkNN 질의처리기법
장동주(Dongjue Jang),안수연(Sooyeon An),정성원(Sungwon Jung) 한국정보과학회 2011 정보과학회논문지 : 데이타베이스 Vol.38 No.5
본 논문에서는 다양한 유형의 위치기반 데이터들을 하나의 R-트리로 통합한 Rm-트리구조와 이 Rm-트리를 이용하여 질의포인트로부터 각 유형별로 k개의 가까운 위치기반 데이터를 찾는 mkNN(multi-type k Nearest Neighbor) 질의처리기법을 제안하였다. 특히, 다양한 유형의 위치기반 데이터들을 각 유형별로 독립된 R-트리로 유지하지 않고, 하나의 Rm-트리로 통합하여 관리함으로써 mkNN 질의처리시 같은 레벨의 공간의 반복탐색을 줄일 수 있도록 하였다. 그리고 각 유형에 대한 위치데이터를 관리하는 부가적인 유형정보 자료구조로서 위치데이터들을 포함하는 지역정보를 담은 TMBR(Type Minimum Bounding Rectangle), 데이터 개수정보를 담은 l-entry를 새로이 고안하여 mkNN 질의처리시 효율적인 휠터링(filtering)과 검색과정이 이루어지도록 하였다. In this paper, we propose an Rm-tree that integrates with location data of various types. We also propose an efficient mkNN query processing technique based on the Rm-tree that computes to find k nearest neighbors with m types for a given query point p. Especially, our proposed mkNN query processing method is able to reduce the repetitive traversal of the search space to compute multi-type k nearest neighbors. We add TMBR(Type Minimum Bounding Rectangle) and l-entry to Rm-tree to have the efficient filtering and searching performance for the processing of mkNN query.
m-유형 공간객체를 위한 R<SUP>m</SUP>-tree기반의 mk-최근접질의 처리기법
장동주(Dongjue Jang),안수연(Sooyeon An),정성원(Sungwon Jung) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1C
본 논문에서는 다양한 타입의 위치기반 데이터들을 하나의 R-tree로 통합한 R<SUP>m</SUP>-tree의 구조와 이 R<SUP>m</SUP>-tree를 이용하여 질의 포인트로부터 각 타입에서 k개의 가까운 위치기반 데이터를 찾는 mkNN(multi-type k nearest neighbor) 질의 처리기법을 제안하였다. 특히, 다양한 타입의 위치기반 데이터들을 각 타입별로 독립된 R-tree로 유지하지 않고, 하나의 R<SUP>m</SUP>-tree로 통합하여 관리함으로써 mkNN 질의 처리시 같은 레벨의 공간의 반복탐색을 줄일 수 있도록 고안하였다. 그리고 각 타입 t에 대한 위치데이터를 관리하는 부가적인 타입정보 자료구조로서 위치정보를 담은 TMBR, 데이터 개수정보를 담은 I<SUB>t</SUB>-entry를 새로이 고안하여 mkNN질의 처리시 효율적인 휠터링(filtering)과 검색과정이 이루어지도록 하였다.