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구매엔지니어링을 위한 지식기반 서비스 적용 방안에 관한 연구
김진일,차재민,신중욱,염충섭,Kim, Jinil,Cha, Jaemin,Shin, Joonguk,Yeum, Choongseup 한국시스템엔지니어링학회 2018 시스템엔지니어링학술지 Vol.14 No.2
In the EPC(Engineering Procurement and Construction) project of the plant, procurement engineering has a profound effect on the profitability of the project. It is important that the procurement specifications are well written to ensure that procurement engineering works properly. In the meantime, the procurement specifications have been created by the experience of the person in charge because there was no system for helping procurement engineering. To cope with this situation, we are developing a procurement engineering management support system (PeMSS). This paper describes how to implement a knowledge-based service in the procurement engineering management support system. First, we briefly introduce the PeMSS, the knowledge base application field, and how to apply it. The parts that requires knowledge-based service are parsing the requirements in the PDF (Portable Document Format) file and management of the document provided by the supplier of the equipment.
김진일,염충섭,신중욱,Kim, Jinil,Yeom, Choongsub,Shin, Joonguk,Salim, Shelly 한국시스템엔지니어링학회 2018 시스템엔지니어링학술지 Vol.14 No.2
This paper is based on the interim result of ongoing research and development project to develop a software system which support procurement activities, namely PeMSS (Procurement Engineering Management Support System). PeMSS is a system that enables development requirements for each equipment and help designing equipment meeting the purchase requirements. Procurement at EPC (Engineering Procurement and Construction) and operational stage of a plant is an important area that determines the integrity and profitability of the plant. Procurement of unsuitable equipment due to selection of suppliers that do not meet or omit critical requirements in purchase specification can result in enormous cost increase due to such as delay in EPC project, unsatisfactory performance and reduced plant operation time. In spite of the importance of the procurement engineering, there is a lack of support system for systematic preparation of purchase specification, so development of the procurement specification is basically relying on the experience of the engineers in charge. Accordingly, it is needed to develop the PeMSS to help procurement engineers develop procurement specification based on systems engineering approach. This paper introduces the design of the PeMSS.
김진일(Jinil Kim),권유진(YooJin Kwon),김진욱(Jin Wook Kim),김성렬(Sung-Ryul Kim),박근수(Kunsoo Park) 한국정보과학회 2010 정보과학회논문지 : 시스템 및 이론 Vol.37 No.1
웹 크롤러는 웹에서 링크를 따라다니며 웹 페이지들을 자동으로 다운로드하는 프로그램으로 주로 웹 환경을 연구하거나 검색 엔진을 만들기 위해 사용된다. 기존의 연구들에서는 웹 크롤러가 인기있는 웹 페이지들을 먼저 크롤링 할 수 있도록 몇 가지 방법들이 제안되었으나 그래프 이론 분야에서 연구되어 온 몇몇 그래프 탐색 기법들은 아직 웹 크롤링 방법으로 고려되지 않았다. 이 논문에서는 잘 알려진 너비 우선 탐색, 깊이 우선 탐색 뿐 아니라 사전식 너비 우선 탐색, 사전식 깊이 우선 탐색 및 최대 크기 탐색을 웹 크롤링 방법으로 고려하여 이 중에서 선형적인 시간복잡도를 가지면서도 인기 있는 웹 페이지를 효율적으로 수집할 수 있는 웹 크롤링 방법을 찾는다. 특히 선형 구현이 단순하지 않은 최대 크기 탐색과 사전식 너비 우선 탐색에 대해서는 분할 정제 방법을 이용한 선형 시간 웹 크롤링 방법을 제시한다. 실험 결과는 최대 크기 탐색이 다른 그래프 탐색 방법에 비해 시간 복잡도 및 크롤링 된 페이지들의 질에 있어서 바람직한 성질을 가짐을 보여준다. Web crawlers are fundamental programs which iteratively download web pages by following links of web pages starting from a small set of initial URLs. Previously several web crawling orderings have been proposed to crawl popular web pages in preference to other pages, but some graph search techniques whose characteristics and efficient implementations had been studied in graph theory community have not been applied yet for web crawling orderings. In this paper we consider various graph search techniques including lexicographic breadth-first search, lexicographic depth-first search and maximum cardinality search as well as well-known breadth-first search and depth-first search, and then choose effective web crawling orderings which have linear time complexity and crawl popular pages early. Especially, for maximum cardinality search and lexicographic breadth-first search whose implementations are non-trivial, we propose linear-time web crawling orderings by applying the partition refinement method. Experimental results show that maximum cardinality search has desirable properties in both time complexity and the quality of crawled pages.
An Effective Web Crawling Algorithm by Graph Search Techniques
김진일(Jinil Kim),권유진(yoojin Kwon),김성렬(Sung-Ryul Kim),박근수(Kunsoo Park) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.2
Web crawlers ar fundamental software which iteratively downloads web pages by following links of web pages starting from a small set of initial URLs. Previously several web crawling orderings have been studied by [1,2]. In this paper we consider various graph search techniques and treat internal links and external links in different manners for effective crawling. For maximum cardinality search (MCS) and lexicographic breadth-first search (LexBFS), we present linear time algorithms based on the partition refinement method [3,4,5]. The experimental results show that maximum cardinality search is preferable to other graph search techniques for web crawlers since it visits web pages with high PageRank earlier than others.
김인준 ( In June Kim ),김성현 ( Sunghyun Kim ),김소영 ( Soyoung Kim ),김진일 ( Jinill Kim ),신관호 ( Kwanho Shin ) 한국금융연구원 2017 한국경제의 분석 Vol.23 No.1
Under the current economic environment characterized by slow growth, low inflation and financial instability, ojectives of central bank have expanded to include financial stability in addition to the traditional objectives of price and employment stability. This paper studies what the proper role of the Bank of Korea (BOK) should be in conducting macroprudential policy to enhance financial stability. This paper proposes that BOK should attempt to stabilize output while maintaining the flexible inflation targeting policy. The global financial crisis shows that price and output stability does not gaurantee financial stability and that financial instability can adversely affect price and output stability in turn. Therefore, the central bank should actively engage in achieving financial stability in advance. Monetary policy itself would not be sufficient to achieve financial stability. BOK needs proper tools to conduct macroprudential policy to satisfy the objective of financial stability added to the BOK Bylaws in 2011. One practical way is to amend the Bylaws to require that the Financial Supervisory Commission (FSC) should consult with BOK in macroprudential policy making process. At the same time, it is necessary to be explicit about the responsibility of BOK. For long-term solution, we suggest three proposals: (1) establishing the “Committee for Financial Stability” who is responsible for all policy making regarding macroprudential policy; (2) designating BOK as the main institution for macroprudential policy; (3) making BOK responsible for all policies regarding financial stability, replacing the role of FSC, following the case of U.K. in the post global financial crisis period. However, the last proposal is not so easy to implement in practice because it requires the overhaul of the whole banking and financial supervisory structure.
평행관 모델링을 통한 보일러 화로벽관 내 밀도파 불안정의 해석
김진일(Jinil Kim),최상민(Sangmin Choi) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.2
화력발전용 관류보일러 화로벽관에서의 밀도파 불안정 예측을 목적으로 수치모델을 개발하였다. 시간 도메인에서 1 차원 유한체적법을 적용하여 관내 비정상상태의 유동장을 계산하였으며, 화로벽관의 평행관 연결을 모사하기 위해 헤더의 모델도 포함하였다. 평행관들 가운데 하나의 관에 열 섭동을 부가 후 관 입출구 유량의 변동을 관찰함으로써 밀도파 불안정을 찾았다. 개발된 모델은 문헌의 실험결과와 검증을 거쳐 700MW 보일러 화로벽관에 적용하였다. 그 결과 Takitani 의 실험결과에서는 평행으로 연결된 우회 유량이 줄어들수록 불안정 경계 열량이 상승하는 경향이 있었던 반면, 보일러 화로벽관의 경우에는 평행관 모델링에 크게 영향을 받지 않음을 확인하였다. A numerical model was developed to predict the density wave oscillation (DWO) in the furnace wall tubes of a fossil-fired once-through boiler. The transient flow fields in the tubes were obtained using a 1D finite volume method in the time domain. A header model was also implemented to simulate the parallel tube connection of the wall tubes. The inlet and outlet mass flow variation in one of the parallel tubes was examined after a heat perturbation to find the DWO. After successful verification with experimental results reported in literature, the developed model was applied to the wall tubes of a 700-MW boiler furnace. In contrast to the simulation of Takitani’s experiment, in which the unstable power thresholds tended to rise in the reduced bypass channel flow, no remarkable changes were observed in the power thresholds in the parallel channel modeling of the wall tubes of the boiler furnace.