사례기반추론을 이용한 웹 기반 건설실패사례 정보시스템

박용성,오치돈,전용석,박찬식,Park, Yong-Sung,Oh, Chi-Don,Jeon, Yong-Seok,Park, Chan-Sik 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.6

국내 건설 산업에서 실패정보는 사례중심의 비체계적인 문서형태로 관리되고, 통계적 분석결과 정보수준의 자료로 제시되고 있다. 이는 건설실패정보의 활용을 통하여 건설프로세스가 지속적으로 개선될 수 있다는 긍정적인 측면을 간과한 건설실무자의 인식의 부재에 기인한다. 이에 본 연구는 건설실패정보의 관리 및 활용에 대한 문제점을 인식하고, 반복적으로 발생되는 건설실패를 사전에 예방할 수 있도록 실패정보를 체계적으로 관리, 공유, 학습, 활용할 수 있는 웹 기반 건설실패사례 정보시스템을 구축하기 위한 목적으로 수행되었다. 본 연구에서 개발된 건설실패사례 정보시스템은 웹과 사례기반추론기법을 이용하여 가장 유사한 과거 사례가 검색될 수 있도록 구현하였으며, 건설실패정보를 체계적으로 관리할 수 있고, 실패사례를 통한 간접적 지식습득 및 미래의 건설프로젝트의 실패발생 예방대책을 수립하는데 활용될 수 있을 것이다. In order to encourage construction practitioners to acknowledge failures and disseminate the information, the failure information must be documented and accumulated with a well-structured format, which contains not only the fact and result but also the circumstance and cause of the failure. In the Korean construction industry, many failures are not explained clearly and often not even reported publicly, partly because due to the lack of understanding positive aspects of failures, which can improve construction practices as a result of learning from failures. The purpose of this study is to develop a web-based construction failure information system using the case-based reasoning techniques, which can systematically accumulate, manage, and share the valuable failure information using a structured failure cases database. It can be utilized for planning proactive solutions on future failures by searching the very similar past failure cases.

영상기반 방사성동위원소 흡수선량 평가

박용성,이용진,김욱,지영훈,김근배,강주현,임상무,우상근,Park, Yong Sung,Lee, Yong Jin,Kim, Wook,Ji, Young Hoon,Kim, Kum Bae,Kang, Joo Hyun,Lim, Sang Moo,Woo, Sang-Keun 한국의학물리학회 2016 의학물리 Vol.27 No.2

디지털 팬텀을 사용한 선량평가 방법은 일반화된 장기에 대해서만 평가가 가능하여 종양에 대한 선량평가가 불가능하다. 이에 본 연구에서는 몸통 팬텀에 방사성동위원소를 주입하고 실제 측정된 CT 영상을 기반으로 장기와 종양에 대하여 몬테카를로 시뮬레이션을 이용하여 S-value를 계산함으로써 장기와 종양에 대한 흡수선량을 평가하고자 하였다. 몸통 팬텀은 폐, 간, 척추, 실린더로 구성되어 있으며 구 모형 팬텀을 이용하여 종양을 모사하였다. 방사성동위원소의 실제 선량 측정은 방사성동위원소 Cu-64 73.85 MBq 주입된 몸통 팬텀에 유리선량계(glass dosimeter)를 삽입하여 방사성동위원소의 선량을 측정하였다. 몬테카를로 시뮬레이션을 위한 몸통 팬텀의 각 영역 정보는 Cu-64가 주입된 몸통 팬텀을 이용하여 PET/CT 영상을 획득하고 CT영상의 해부학적 정보를 우선으로 평균값과 매뉴얼로 각 장기 및 종양을 영역별로 분할하여 제공하였다. 방사성동위원소의 영역별 잔류시간은 PET 영상에서 분할된 영역을 기반으로 시간변화에 따라 Cu-64 방사능량을 측정하여 계산하였다. 각 영역의 S-value는 몬테카를로 시뮬레이션에 입력된 공간상의 좌표, 복셀 크기, 밀도정보를 사용하여 계산하였다. 흡수선량 평가는 몬테카를로 시뮬레이션을 이용하여 선량분포를 계산하였으며 각 영역별로 미치는 S-value와 잔류시간을 이용하여 계산하였다. 각 영역에서의 흡수선량은 간에서 4.52E-02 mGy/MBq, 종양1에서 4.61E-02 mGy/MBq, 그리고 종양2에서 5.98E-02 mGy/MBq으로 평가되었다. 유리선량계로 측정된 선량 값과 시뮬레이션을 통해 계산된 선량 값의 차이는 평균 12.3% 이내의 차이를 보였다. 본 연구결과는 다양한 크기와 위치에 대하여 영상기반 선량평가의 적용가능성을 제시하였다. An absorbed dose calculation method using a digital phantom is implemented in normal organs. This method cannot be employed for calculating the absorbed dose of tumor. In this study, we measure the S-value for calculating the absorbed dose of each organ and tumor. We inject a radioisotope into a torso phantom and perform Monte Carlo simulation based on the CT data. The torso phantom has lung, liver, spinal, cylinder, and tumor simulated using a spherical phantom. The radioactivity of the actual absorbed dose is measured using the injected dose of the radioisotope, which is Cu-64 73.85 MBq, and detected using a glass dosimeter in the torso phantom. To perform the Monte Carlo simulation, the information on each organ and tumor acquired using the PET/CT and CT data provides anatomical information. The anatomical information is offered above mean value and manually segmented for each organ and tumor. The residence time of the radioisotope in each organ and tumor is calculated using the time activity curve of Cu-64 radioactivity. The S-values of each organ and tumor are calculated based on the Monte Carlo simulation data using the spatial coordinate, voxel size, and density information. The absorbed dose is evaluated using that obtained through the Monte Carlo simulation and the S-value and the residence time in each organ and tumor. The absorbed dose in liver, tumor1, and tumor2 is 4.52E-02, 4.61E-02, and 5.98E-02 mGy/MBq, respectively. The difference in the absorbed dose measured using the glass dosimeter and that obtained through the Monte Carlo simulation data is within 12.3%. The result of this study is that the absorbed dose obtained using an image can evaluate each difference region and size of a region of interest.

환망 초지기의 배트 운용이 종이의 품질에 미치는 영향

박용성,전양,서영범,Park, Yong-Sung,Jeon, Yang,Seo, Yung Bum 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.2

Cylinder machine usually gives more fiber orientation than fourdrinier and has limitation in machine speed because of fiber wash-off caused by centrifugal force when machine speed increases. This study aimed for the improvement of paper formation and productivity by setting an apron in vat inlet and by adjusting mould water head. Improvement of formation and increase of machine speed were achieved, which ultimately improve productivity. Installing an apron successfully decreased fiber wash-off. Fiber orientation and two-sideness of ash distribution became less severe. The proper adjustment of water head inside the cylinder mould proved to be an important factor not only in paper formation but also in decreasing paper two-sideness.

다양한 조성의 Sn-Ag-Cu 합금계 무연 솔더볼과 ENIG(Electroless Ni Immersion Gold), Cu-OSP(Oraganic Solderability Preservertive) 금속 패드와의 계면 반응 연구

박용성,권용민,손호영,문정탁,정병욱,강경인,백경욱,Park, Yong-Sung,Kwon, Yong-Min,Son, Ho-Young,Moon, Jeong-Tak,Jeong, Byung-Wook,Kang, Kyung-In,Paik, Kyung-Wook 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.4

본 논문에서는 다양한 조성의 주석-은-구리 합금계 솔더볼과 ENIG 및 Cu-OSP 패드와의 계면 반응에 대해 연구하였다. ENIG 패드와 미량의 Sb이 첨가된 합금 솔더와의 계면 반응 시 다른 솔더에 비해 매우 얇은 100 nm 내외의 두께를 가진 P-rich Ni layer가 형성되었다. 미량의 Ni이 첨가된 합금 솔더와 Cu-OSP 금속 패드와의 계면 반응 시에는 다른 솔더와는 달리 균일한 두께의 $Cu_6Sn_5$ 금속간화합물이 형성되었으며 추가 리플로우 시에 금속간화합물 입자가 거의 성장하지 않았다. 또한 $150^{\circ}C$의 장시간 열처리 시에 다른 솔더에 비해 매우 얇은 두께의 $Cu_3Sn$ 금속간화합물이 형성되었다. In this study, we investigated the interfacial reactions between various Sn-Ag-Cu(SAC) solder alloys and ENIG(Electroless Ni Immersion Gold) and Cu-OSP(Organic Solderability Preservative) pad finish. In the case of the interfacial reaction between Sb added SAC solder and ENlf thinner P-rich Ni layer was formed at the interface. In the case of the interfacial reaction between Ni added SAC solder and Cu-OSP, the uniform $Cu_6Sn_5$, intermetallic compounds(IMCs) were formed and $Cu_6Sn_5$ grain did not grow after multiple reflows. Thinner $Cu_3Sn$ IMCs were farmed at the interface between $Cu_6Sn_5$ and Cu-OSP after $150^{\circ}C$ thermal aging.

PDA 화면 내 버튼 선택을 위한 입력지원방식의 사용성 평가

박용성,한성호,문정태,전석희,Park, Yong-S.,Han, Sung-H.,Moon, Jung-Tae,Jeon, Suk-Hee 대한인간공학회 2005 大韓人間工學會誌 Vol.24 No.3

The primary objective of this study is to design input methods for assisting button selection tasks on a PDA screen. Familiar methods in the existing computing environments were investigated to develop aiding methods. Factors manipulated in the experiment included aiding method, button size, and users' prior experience with PDAs. A total of sixteen participants examined the usability of button selection tasks. Two types of button selection tasks were used as experimental tasks; one was selecting a target button, and the other was selecting multiple target buttons consecutively. The results showed that the aiding method and the button size had significant effects on the subjective satisfaction as well as the performance. In addition, users' prior experience with PDAs affected the performance significantly. The interaction between the aiding method and the button size was found to have significant effects on the performance. However, the interaction effect between the button size and the PDA experience was significant on the task performance time only for the multiple button selection tasks. Design considerations were proposed based on the experimental results. These can be applied to the PDA interaction design to make the PDAs more usable.

국내 경유자동차 촉매식 후처리장치의 성능 및 기술 현황

박용성(Yong Sung Park) 한국자동차공학회 2008 오토저널 Vol.30 No.1

정책네트워크의 동태적 유형분석에 관한 연구

박용성(Park Yong-Sung) 서울행정학회 2004 한국사회와 행정연구 Vol.15 No.3

Public policy-making are increasingly handled through consensus-seeking partnerships involving most affected stake-holders. This paper formalizes the concept of a dynamic policy network and analyze the characteristics of watershed policy-making process in the case of the Han-river and the Nakdong river. It examine the dynamic interactions between policy actors(government-local resident-NGOs) and analyze the evolution of dynamic patterns of policy network. In particular, the paper focused on the investigation of the dynamic interdependent relationship around policy making process, and the how policy actors construct networks or form advocacy coalitions around the watershed policy-making. Results from the studies highlights the dynamics of policy making process in regulatory policy area involving various stake-holders.

Phenothiazine계 전도성고분자의 합성 및 유기박막태양전지로의 적용 연구

박용성 ( Yong Sung Park ),유한솔 ( Han Sol Yoo ) 한국공업화학회 2013 공업화학 Vol.24 No.1

본 연구에서는 고온 고압반응을 통하여 4종의 전도성 고분자 poly[(N-butyl-phenothiazine)-sulfide] (PBPS), poly[(N-hexyl- phenothiazine)-sulfide] (PHPS), poly[(N-decyl-phenothiazine)-sulfide] (PDPS), poly[(N-(2-ethylhexyl)-phenothiazine)-sulfide] (PEHPS)를 합성하였다. 각 단계의 합성된 화합물의 구조는 1 H-NMR을 통하여 확인하였고, UV-Vis, cyclic voltammetry, GPC를 이용하여 합성된 고분자의 물성을 확인하였다. PBPS, PHPS, PDPS, PEHPS의 최대흡수파장은 각각 338, 341, 340, 334 nm이었으며, 각 고분자의 광학적 밴드 갭은 3.11, 3.13, 3.16, 3.05 eV이었다. 유기박막태양전지로서의 적용가 능성을 확인하기 위해 합성된 고분자를 전자 받개 물질인 PC71BM과 블렌딩하여 ITO/PEDOT : PSS/polymer (PBPS, PDPS) : PC71BM (1 : 3, w/w)/BaF2/Ba/Al 구조의 소자를 제작하였고, solar simulator로 광전변환효율을 측정하였다. PBPS의 광전변환효율은 0.076%이었고, PDPS의 광전변환효율은 0.136%이었다. In this paper, four conducting polymers (poly[(N-butyl-phenothiazine)-sulfide] (PBPS), poly[(N-hexyl-phenothiazine)-sulfide] (PHPS), poly[(N-decyl-phenothiazine)-sulfide] (PDPS), and poly[(N-(2-ethylhexyl)-phenothiazine)-sulfide] (PEHPS)) were synthesized with a high temperature and high pressure reaction. The structures of synthesized polymers were confirmed by 1 H-NMR and characterized by UV-Vis, cyclic voltammetry, and GPC. From the UV-Vis absorption spectra, the λmax values of PBPS, PHPS, PDPS, and PEHPS were 338, 341, 340, and 334 nm, respectively and their optical band gaps were 3.11, 3.13, 3.16, and 3.05 eV, respectively. To evaluate the feasible applicability as a photovoltaic cell, the devices composed of for example, ITO/PEDOT : PSS/polymer (PBPS, PDPS) : PC71BM (1 : 3, w/w)/BaF2/Ba/Al were fabricated using the blends of the PBPS and PDPS as a donor, and PC71BM as an acceptor. Then, the power conversion efficiencies (PCE) of devices were estimated as 0.076% of PBPS and 0.136% of PDPS by solar simulator.

천장형 전열교환기를 이용한 환기시스템

박용성(Park Yong Sung) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

지방행정체제개편의 이론과 실제

박용성(Park Yong-sung) 경기연구원 2008 경기논단 Vol.10 No.4

Focusing on the comparable efficiency of local administrative service, the article reviews the theoretical and practical possibility of local administrative reform in terms of the existence of the economy of scale in providing local administrative service. Based on an comparative reviews of cases of Japan, UK and Korea, It is founded that the continued focus on consolidation of local entities and shared services can be helpful to enhance of the competitive of local autonomous entities. This article provides some policy implications for the creation of an efficient local entities in Korea in aspects of legal and administrative framework as well as incentive building systems. It is also recommended that any administrative reform need to take the role of the local indigenous institutions and contextual values into account, and that the voluntary consolidation among the local autonomous entities need to reflect institutional competence as well as competitiveness of the local administrative system.