ARENA를 활용한 3D 프린팅 기술 기반 거푸집 공사의 생산성 분석 시뮬레이션 모델 개발

안희재 ( Ahn¸ Heejae ),이창수 ( Lee¸ Changsu ),김하림 ( Kim¸ Harim ),김태훈 ( Kim¸ Taehoon ),조훈희 ( Cho¸ Hunhee ),강경인 ( Kang¸ Kyung-in ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2

The technology of manufacturing freeform molds with S-LOM based 3D printer has advantages in the production period and the curvature range. However, there is no any support tool about productivity analysis of S-LOM technology because S-LOM technology is early-stage technology. There can be problems about increase of construction time and cost without any decision support tool like productivity analysis models etc. Therefore, in this study, the productivity analysis simulation model for freeform formwork based on S-LOM technology was developed using ARENA software. The process and logic of manufacturing freeform molds can be easily visualized in this model. Futhermore, the resource like labor, equipment and material can be easily optimized with this model. As a result, it can contribute to preventing the increase of construction time and cost in formwork with further productivity analysis.

Safety Assessment on Long-term Radiological Impact of the Improved KAERI Reference Disposal System (the KRS+)

Heejae Ju,In-Young Kim,Youn-Myoung Lee,Jung-Woo Kim,Yongsoo Hwang,Heui-joo Choi,Dong-Keun Cho 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.S

The Korea Atomic Energy Research Institute (KAERI) has developed geological repository systems for the disposal of high-level wastes and spent nuclear fuels (SNFs) in South Korea. The purpose of the most recently developed system, the improved KAERI Reference Disposal System Plus (KRS+), is to dispose of all SNFs in Korea with improved disposal area efficiency. In this paper, a system-level safety assessment model for the KRS+ is presented with long-term assessment results. A system-level model is used to evaluate the overall performance of the disposal system rather than simulating a single component. Because a repository site in Korea has yet to be selected, a conceptual model is used to describe the proposed disposal system. Some uncertain parameters are incorporated into the model for the future site selection process. These parameters include options for a fractured pathway in a geosphere, parameters for radionuclide migration, and repository design dimensions. Two types of SNF, PULS7 from a pressurized water reactor and Canada Deuterium Uranium from a heavy water reactor, were selected as a reference inventory considering the future cumulative stock of SNFs in Korea. The highest peak radiological dose to a representative public was estimated to be 8.19×10-4 mSv‧yr-1, primarily from 129I. The proposed KRS+ design is expected to have a high safety margin that is on the order of two times lower than the dose limit criterion of 0.1 mSv‧yr-1.

Rotational dynamics of thiocyanate ions in highly concentrated aqueous solutions

Kim, Heejae,Park, Sungnam,Cho, Minhaeng The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.18

<P>The thiocyanate (SCN<SUP>−</SUP>) anion is known as one of the best denaturants, which is also capable of breaking the hydrogen-bond network of water and destabilizing native structures of proteins. Despite prolonged efforts to understand the underlying mechanism of such Hofmeister effects, detailed dynamics of the ions in a highly concentrated solution have not been fully elucidated yet. Here, we used a dispersive IR pump–probe spectroscopic method to study the dependence of vibrational lifetimes and rotational relaxation times of thiocyanate ions on KSCN concentration in D<SUB>2</SUB>O. The nitrile stretch mode is used as a vibrational probe for dispersed IR pump–probe and FTIR measurements. To avoid possible self-attenuation of the IR pump–probe signal by highly concentrated SCN<SUP>−</SUP> ions, we added a small amount of <SUP>13</SUP>C-isotope-labeled thiocyanate ions (S<SUP>13</SUP>CN<SUP>−</SUP>) and focused on the excited-state absorption contribution to the IR pump–probe signal of the <SUP>13</SUP>C-isotope-labeled nitrile stretch mode. Quite unexpectedly, the vibrational lifetime of S<SUP>13</SUP>CN<SUP>−</SUP> ions is independent of the total KSCN concentration in the range from 0.46 m (molality) to 11.8 m while the rotational relaxation time of S<SUP>13</SUP>CN<SUP>−</SUP> ions is linearly dependent on the total KSCN concentration. By combining the present experimental findings with the fact that the dissolved ions of KSCN salt have a strong tendency to form a large ion cluster in a highly concentrated aqueous solution, we believe that the ion clusters consisting of potassium and thiocyanate ion pairs in D<SUB>2</SUB>O behave like ionic liquids and the ions inside ion clusters are weakly bound by electrostatic Coulombic interactions. The ability of SCN<SUP>−</SUP> ions to form ion clusters in aqueous protein solutions seems to be a key to understand the Hofmeister ion effect. We anticipate that the present experimental results provide a clue for further elucidating the underlying mechanism of the Hofmeister ion effects on protein stability in the future.</P> <P>Graphic Abstract</P><P>Rotational dynamics of <I>chaotropic</I> thiocyanate ions in highly concentrated aqueous solutions studied by IR pump–probe spectroscopy. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp23749k'> </P>

대설 대응의 제도적 개선을 위한 중요도 분석

Kim, Heejae,Yoon, Sanghoon,Park, Keunoh,Kim, Geunyoung 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.3

본 연구는 대설재난 대응을 위한 제도적 개선요인을 도출하고 주요 우선순위를 선정하기 위해 AHP분석을 수행하였다. 그 결과, 대설대응관련 계획수립이 중요도 0.461로 가장 중요한 것으로 나타났다. 이는 대설대응체계 구축을 위해서는 시설, 자원, 정책보다 계획의 수립이 더 중요하다는 것을 의미한다. 대설대응을 위한 계획 중에서도 대응과 관련된 계획 수립이 종합중요도 0.175로 다른 개선요소에 비해 가장 우선적으로 선행되어야 한다고 도출되었다. 이것은 대설관련 계획 중 경감 및 예방, 대비, 대응, 복구계획 중에서 대응측면을 가장 중요하게 생각하는 것으로 대설과 관련된 법제도 개선시 가장 필요하다는 것을 시사해주고 있다. 본 연구결과는 향후 대선재난 대응을 위한 제도적 개선방안 수립시 기초자료로 활용할 수 있을 것이다. This study deducted institutional improvement factors for respond of heavy snowfall disaster and performed AHP analysis for choosing the priority. The result of Analysis, establishment of plan concerned heavy snowfall respond was represented most important factor(Importance : 0.461), this is meaningful establishment of plan is more important than facilities, sources, policies for building system of heavy snowfall respond. Establishment of plan concerned respond was represented most important element(Comprehensive Importance : 0.175) in plan for heavy snowfall respond, it is suggested that establishment of respond plan of heavy snowfall has to need for improving law and institution about heavy snowfall. The result of this study will be useful when the central or local government establish institutional improvement plan for respond of heavy snowfall disaster.

Ways to Vitalize Traditional Culture Based on the Youth Entertainment Culture - With a Focus on Hanbok Rental Trends

Heejae Kim,Heesoo Choi 한국콘텐츠학회 2016 한국콘텐츠학회 ICCC 논문집 Vol.2016 No.12

The Korea Nurses' Health Study: A Prospective Cohort Study

Kim, Oksoo,Ahn, Younjhin,Lee, Hea-Young,Jang, Hee Jung,Kim, Sue,Lee, Jung Eun,Jung, Heeja,Cho, Eunyoung,Lim, Joong-Yeon,Kim, Min-Ju,Willett, Walter C.,Chavarro, Jorge E.,Park, Hyun-Young Mary Ann Liebert 2017 Journal of women's health Vol.26 No.8

Infrared Probes for Studying the Structure and Dynamics of Biomolecules

Kim, Heejae,Cho, Minhaeng American Chemical Society 2013 Chemical reviews Vol.113 No.8

<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/chreay/2013/chreay.2013.113.issue-8/cr3005185/production/images/medium/cr-2012-005185_0021.gif'></P>

지역별 제설 시나리오 응원체계 구축연구

Heejae Kim,Youngsuk Oak,Geunyoung Kim 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.2

전 세계적으로 이상기후로 인한 고위도 북반부에 폭설이 빈번하게 발생하고 있으며, 폭설로 발생하는 피해액은 국내 자연재해 피해액 중 높은 실정이다. 자연재해가 다양하게 발생하고 있다. 우리나라에서는 2004년, 2005년, 2011년 강릉 및 포항 지역에서 폭설로 인한 특별재난지역으로 선포되며, 도로 제설업무 수행요령안(안)이 개정되었다. 제설방법론과 지역별 장비보유량 및 제설담당구간이 국도별로 분류가 되어있지만, 인근 시·군별 응원체계 구축은 분류가 되어있지 않은 상태이다. 다만, 자체 제설이 불가능할 경우 군부대 및 인근 사무소에 지원 및 협조 요청이라는 내용이 담겨있다. 따라서, 본 연구에서는 대설재난 발생시 대설재난 유형 시나리오를 개발하고, 시나리오별 지역특성을 고려한 대응체계 및 응원체계 구축하는 연구를 하였다. 시나리오 도출을 위해 지역별 일 강설데이터와 재해연보 데이터를 수집하고, 유사 과거사례를 비슷한 패턴으로 분류하여 재설 GIS지도를 도출하였다. 본 연구에서는 지역별 대설재난 유형별로 분석함으로써 5단계의 시나리오를 도출하여, 지역별 제설응원체계를 구축하였다. 5단계의 시나리오는 전국(1단계), 수도권·충청권(2단계), (3단계), 영동권·호남권(4단계), (5단계)로 유형으로 도출되었으며, 그에 따른 인근 시·군 제설 응원체계 구축을 제시하였다. Because of abnormal weather, a heavy snow on the Northern latitudes occurs frequently. This has resulted in significant damage and recovery costs. In korea, it has been declared a special disaster area due to heavy snowfall in Gangneung and Pohang 2004, 2005 and 2011, so there was a revision of action instruction for the road snow removal. Although, in our current system, snow removing methodology, regional equipment holdings, and snow responsible interval, respectively, has been classified by the National Highway, near cities and provinces support system not yet prepared. Only, if snow removing is not possible within the region itself, which contained the contents of "support and assistance to military or nearby offices requests". In this thesis, we studied the disaster scenario development according to heavy snow and the response and support system to the features of each regional. For the scenario deduction, we preferentially collected day snowfall and disaster yearbook data to regionals, classified similar pattern and plotted GIS snow map. We also classified heavy snow disaster by region and type and we deduced five-step scenario. The five-step scenario is nationwide(1st-stage), the National Capital region(2nd-stage), the Chungcheong Provinces(3rd-stage), the Kangwon province(4th-stage) and the Chŏlla provinces(5th-stage). Therefore we build near provinces support system according to five-step scenario.

V. Consortium Members Can Directly Acquire Claim for Contract Price Supreme Court, 2009Da105406, Decided May 17, 2012 [Claim for Contract Price]

( Heejae Kim ),( Yunhee Kim ),( Jeesoo Kim ),( Suebin Park ) 고려대학교 법학연구원 2017 Korea University Law Review Vol.21 No.-

Three Dimensional FEM Simulation for Spinning of Non-circular Fibers

Kim, Heejae,Chung, Kwansoo,Youn, Jae-Ryoun The Korean Fiber Society 2000 Fibers and polymers Vol.1 No.1

A finite element method is employed fer a flow analysis of the melt spinning process of a non-circular fiber, a PET(polyethylene terephthalate) filament. The flow field is divided into two regions of die channel and spin-line. A two dimensional analysis is used for the flow within the die channel and a three dimensional analysis fur the flow along the spin-line. The Newtonian fluid is assumed for the PET melt and material properties are considered to be constant except for the viscosity. Effects of gravitation, air drag force, and surface tension are neglected. Although the spin-line length is 4.5 m only five millimeters from the spinneret are evaluated as the domain of the analysis. Isothermal and non-isothermal cases are studied fer the flow within the die channel. The relationship between the mass flow rate and the pressure gradient is presented for the two cases. Three dimensional flow along the spin-line is obtained by assuming isothermal conditions. It is shown that changes in velocity and cross-sectional shape occur mostly in the region of 1mm from the die exit.