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입자상 물질 수량 규제 대응을 위한 디젤 승용자동차의 국내연구기관간 입자상 물질 배출 상관성 시험 및 평가
이형민(Hyungmin Lee),권상일(Sangil Kwon),이상민(Sangmin Lee),전종익(Jongik Jun),우영민(Youngmin Woo),이민호(Minho Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In early 2008, the ILCE (Inter-Laboratory Correlation Exercise) was performed by the Korea Particle Measurement Program (KPMP) with a domestic diesel passenger vehicle equipped with a catalyzed DPF between three certification laboratories and the research center of an automotive manufacturer to meet EURO 5 and EURO 6 of particle number concentration for light-duty vehicles. This paper focused on measuring the particle number and mass levels from a representative light-duty diesel passenger vehicle during new European driving cycle (NEDC) mode to analyze the repeatability and reproducibility between laboratories in Korea. In addition, particle size distribution characteristics from ILCE test vehicle were compared with LPG, gasoline, and non-DPF diesel vehicles. From the ILCE test results in Korea, the mean total particle number concentration levels ranged from 5.43E+10 #/㎞ to 1.58E+11 #/㎞ and 0.0003 g/㎞ to 0.0036 g/㎞ for particle mass. Repeatability between participating laboratories ranged from 32% to 66% for particle number, 11% to 70% for particle mass; the reproducibility level was 46% for particle number, and 66% for particle mass emission.
MaengJe Cho,SuJeong Seong,JeeEun Park,InWon Chung,YoungMoon Lee,Ahn Bae,JoonHo Ahn,DongWoo Lee,JaeNam Bae,SeongJin Cho,JongIk Park,Jungwoo Son,SungMan Chang,BongJin Hahm,JunYoung Lee,JeeHoon Sohn,JinS 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.2
Objective-The aim of this study was to estimate the prevalence and correlates of mental disorders in Korean adults. Methods-Door to door household surveys were conducted with community residents aged 18–74 years from July 19, 2011, to November 16, 2011 (n=6,022, response rate 78.7%). The sample was drawn from 12 catchment areas using a multistage cluster method. Each subject was assessed using the Korean version of the World Health Organization Composite International Diagnostic Interview (CIDI) based on the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Results-Lifetime and 12-month prevalence estimates were as follows: alcohol use disorders, 13.4% and 4.4%, respectively; nicotine use disorders, 7.2% and 4.0%, respectively; anxiety disorders, 8.7% and 6.8%, respectively; and mood disorders, 7.5% and 3.6%, respectively. The prevalence rates of all types of DSM-IV mental disorders were 27.6% and 16.0%, respectively. Being female; young; divorced, separated, or widowed; and in a low-income group were associated with mood and anxiety disorders after adjustment for various demographic variables, whereas being male and young were associated with alcohol use disorders. Higher income was not correlated with alcohol use disorder as it had been in the 2001 survey. Conclusion-The rate of depressive disorders has increased since 2001 (the first national survey), whereas that of anxiety disorders has been relatively stable. The prevalence of nicotine and alcohol use disorders has decreased, and the male-to-female ratio of those with this diagnosis has also decreased.
김종익(Jongik Kim),최일환(Ilhwan Choi),이현숙(Hyun-Sook Lee),김형주(Hyoung-Joo Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
XML은 반 구조 데이터(semi-structured data)의 일종으로 데이터들이 정형화된 구조를 가지고 있지 않다는 것이 특징이다. 기존의 데이터베이스 시스템은 고정된 스키마를 통해 데이터를 저장 관리하기 때문에 정형화된 구조를 가지지 않는 XML 문서를 저장하기에는 한계가 있다. 본 논문에서는 정형화된 구조를 가지지 못하는 XML 문서를 효과적으로 저장하고 관리할 수 있는 저장장치를 구현하고 구현 사항에 대해 설명한다. 본 논문의 저장 장치는 XML을 DOM트리로 표현한 후 DOM트리의 각 노드를 객체로 만들어 저장한다. 본 논문의 저장 장치는 다중 사용자를 지원하기 위해 클라이언트 서버 구조로 구성되어 있으며 각 객체는 전용 파일, 관계형 시스템의 LOB등 다양한 하부 구조에 저장될 수 있다.
변종익,이경식,박성수,강성열 한국경영과학회 2002 한국경영과학회지 Vol.27 No.4
This paper considers subway crew scheduling problem. Crew scheduling is concerned with finding a minimum number of assignments of crew to a given timetable satisfying various restrictions. Traditionally, crew scheduling problem has been formulated as a set covering or set partitioning problem possessing exponentially many variables, but even the LP relaxation of the problem is hard to solve due to the exponential number of variables. In this paper, we propose the solution is not guaranteed. We develop an algorithm that solves the column-generation problem in polynomial time. In addition, the integrality of the solution is accomplished by variable-fixing technique. Computational result for a real instance is reported.
한강 살리기 4공구 여주보가 지역 환경에 미치는 영향에 관한 문헌적 고찰
김종익(Jongik Kim),이태관(Taegwan Lee) 계명대학교 낙동강환경원 2010 環境科學論集 Vol.14 No.1
The 4 major rivers restoration plan of South Korea was first announced as a part of the “Green New Deal” policy. Yeoju weir, which is constructed under this restoration plan, is to provide water security, maintain the level of water depth, and prevent flood control. Yeoju weir also pursues regional development centered on rivers that elevates local economical growth, regional culture, and quality of life. However, there is a possibility that Hyohongneung and Sejongneung which are Joseon-era royal tombs alongside a Yeoju county would be damaged and as a result, those neung-type tombs would be negated by UNESCO World Heritage Site. Moreover, a slower flow velocity deteriorates the water quality, and the increased ground water level overflows or forms its surroundings wetlands. Therefore, after weir construction, it is necessary to provide fundamental resolution of floods and water scarcity and to secure the status of two tombs as they are under UNESCO policy.
이은석 ( Eunseok Lee ),김종익 ( Jongik Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
유사문자열 검색이란 문자열 집합에서 주어진 문자열과 유사한 문자열들을 검색하는 것으로 정보검색, 데이터 클리닝 등의 분야에서 활용되고 있다. 효율적인 유사문자열 검색을 위해 사전에 문자열 집합에 대한 역리스트를 구성하고 문자열이 주어졌을 때, 주어진 문자열에 관련된 역리스트를 병합하여 유사도 기준을 만족하는 문자열을 찾는다. 이때 비용을 줄이기 위해 일부의 역리스트만 병합하고 나머지 역리스트에 대해서는 이진탐색을 하는 방법이 있다. 본 논문에서는 역리스트를 이진탐색할 때, 불필요한 탐색구간을 제거하여 역리스트 탐색 비용을 줄이는 방법을 제안한다.