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우리나라 일반적인 밭경지 특성을 고려한 초생대 유사저감효과 분석
서정훈,최경숙,Seo, Jeong-Hoon,Choi, Kyung-Sook 한국농공학회 2013 한국농공학회논문집 Vol.55 No.4
This study focused on the sediment reduction effects of VFS (vegetative filter strip) systems for the general characteristics of uplands in Korea. General conditions of upland fields were investigated through national scales of annual agricultural statistics. 7-15 % of slope with loam soil was the dominant types of uplands, and the hydrologic soil group feature usually belong to Type B. The common sizes of uplands were bigger than 0.1 ha and less than 0.2 ha, and 86.2 % of them account for less than 1.0 ha. With this information, 0.1 ha, 0.5 ha, and 1.0 ha of uplands with various shapes and 7-15 % of slopes were considered for the VFS system simulations. 20 mm, 40 mm, and 100 mm of daily precipitation were applied. As a result, the trapping efficiencies of VFS systems were obtained 37.4~100 % for 7 % slope and 18.1~98.0 % for 15 % slope of the less than 1.0ha of uplands. As rainfall increased, sediment loads also increased with slope and slope length increase. Also as size and slope of uplands and slope length increased with VFS length decrease, the trapping efficiency decreased for the same amount of rainfall. The optimum lengths of VFS systems for the givien upland conditions were suggested based on the modelling results with condition of VFS length less than 20 % of upland areas.
Automating Model Building Processes for Simulation of Complex Manufacturing and Logistics Systems
서정훈,김갑환,Seo, Jeong Hoon,Kim, Kap Hwan The Korea Society for Simulation 2018 한국시뮬레이션학회 논문지 Vol.27 No.2
시뮬레이션은 물류 또는 제조 시스템의 효율성을 평가하고 시스템의 결과를 예측하는 데 사용되었다. 새로운 시뮬레이션 모델은 시설 설계 프로세스 중에 새로운 대체 설비 및 배치를 평가하는 데 필요로 한다. 시뮬레이션 모델을 수정하여 매개변수와 같은 사소한 변경을 처리하기는 쉽지만 시뮬레이션 모델러가 많은 시뮬레이션 서브 모델의 변경을 포함하여 레이아웃을 변경하는 데는 많은 시간과 노력이 필요로 한다. 따라서 본 연구에서는 AutoCAD layout의 정보를 시뮬레이션 모델에 자동으로 변환하는 방법을 제안한다. 또한 표준 문서를 Excel 양식으로 정의하고 기본 레이아웃, 프로세스, 시설 및 작업자에 대한 정보를 시뮬레이션 모델에 자동으로 변환하는 방법도 제안한다. Tecnomatix Plant Simulation 9.0이라는 시뮬레이션 전용 Tool이 사용되었다. 본 논문에서 제시한 접근한 방법은 반도체 웨이퍼 공장을 대상으로 사례 연구되었다. Simulations have been used to evaluate the efficiency of logistics or manufacturing systems and predict the outcomes of the systems. New simulation models are needed to evaluate new alternative plants and layouts during the resource design process. Although it is easy to handle minor changes in parameters by modifying a simulation model, it takes considerable time and effort for simulation modelers to alter the layout, which involves changes in many simulation sub-models. Therefore, this study proposes a method to transfer information in AutoCAD layout to the simulation model automatically. This study also defines a standard document as an Excel Form, and suggests a method to transfer information on the basic layouts, processes, resources, and workers to a simulation model automatically. A simulation tool, called Tecnomatix Plant Simulation 9.0, was used for this study. The proposed approach in this study was applied to a semiconductor wafer factory for a case study.
레일 방식의 컨테이너 터미널에서의 이송장비 할당 알고리즘
서정훈(Jeong Hoon Seo),이상혁(Sanghyuk Yi),김갑환(Kap Hwan Kim) 대한산업공학회 2017 대한산업공학회지 Vol.43 No.6
With the emergence of mega vessels, global shipping lines are implementing the mass container transport strategy to achieve economies of scale. To serve the mega container vessel, the ship operation in a container terminal is facing the limitation of productivity. Thus, new conceptual designs of a container terminal have been suggested in many researches to enhance its efficiency. This paper discusses the concept of the rail-based automated container terminal which consists of the rail-mounted transport area and rail-based storage yard area. In this system, the transport area play an important role, because numerous vehicles should transport containers within the limited area. Hence, the dispatching rules for vehicles are proposed in order to improve the productivity of the terminal. The simulation model is developed to perform experiments which compare the performance of the proposed rules. In addition, the statistical analysis is conducted to confirm the meaningful performance of these rules.
가정용 스마트 화분의 환경정보 모니터링을 위한 어플리케이션 구축 연구
서정훈(Seo Jeong Hoon),여현(Yoe Hyun),이명훈(Lee Meong Hun),양광호(Yang Kwang Ho),김승재(Kim Seung Jae) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
1세대 스마트팜 기술은 농민의 피로도 감소와 노동력 절감을 목적으로 한 원격 제어 관리 기술을 말한다. 본 논문에서 제시한 가정용 스마트 화분의 환경정보 모니터링을 위한 어플리케이션 구축을 통해 스마트 화분에서 수집된 센싱 데이터가 저장된 데이터베이스에서 웹으로 송출된 데이터를 시간과 공간의 제약 없이 모바일로 모니터링이 가능하게 함으로써 가정용 스마트 화분을 이용하여 반려식물을 기르는 사용자들에게 작물 재배 실패에 대한 불안감을 줄여줄 수 있을 것으로 기대된다.
고분자 전해질막 연료전지(PEMFC) 가스확산층의 이방성에 따른 성능 해석
서정훈(Jeong Hoon Seo),김동규(Dong Kyu Kim),백경돈(Kyung Don Baik),김선엽(Seon Yeop Kim),송한호(Han Ho Song),김민수(Min Soo Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Performance characteristics according to fiber direction of anisotropic Gas Diffusion Layer(GDL) has been numerically investigated. To analyze the characteristics accurately, different GDL properties(as porosity, diffusivity and permeability) under rib/channel by non-uniform compression is defined when mesh grid is generated. Simulation results explain that performances of fuel cell with 90˚ GDL are generally higher than those with 0˚ GDL, because saturation water distribution is lower in 90˚ GDL by higher permeability and porosity compared with 0˚ GDL. The results mean anisotropic characteristics of GDL can play import role in water management and cell performance.
레일기반 컨테이너 이송 시스템의 교착에 관한 시뮬레이션 연구
서정훈(Jeong-Hoon Seo),이상혁(․,Sang-Hyuk Yi),김갑환(Kap-Hwan Kim) 한국항해항만학회 2018 한국항해항만학회지 Vol.42 No.1
초대형선박의 등장으로 컨테이너 터미널 생산성의 한계에 직면하고 있으며 이를 해결하기 위한 새로운 개념의 터미널시스템들이 제안되고 있다. 본 논문에서는 개념설계 중인 레일기반 컨테이너 이송시스템을 대상으로 연구한다. 이는 레일 위를 움직이는 무인반송차인 플랫카와 천장형 레일을 따라 움직이는 셔틀크레인으로 구성된 시스템이다. 자동화된 컨테이너 터미널에서 컨테이너 수송 기능을 담당하는 무인반송차의 운영 시 교착과 같은 병목현상은 오랫동안 중요한 문제로 잘 알려져 있다. 따라서 초대형 선박과 같이 대량의 컨테이너 취급하는 신개념의 레일기반 컨테이너 이송시스템에서 발생 가능한 교착 현상을 정의하고 해결방안에 대해 논한다. 교착 현상은 이종장비 간 교착과 플랫카 간 교착문제로 구분하여 소개한다. 본 연구는 시뮬레이션 접근법을 사용하여 레일기반 컨테이너 시스템 모델을 개발한다. 개발된 시뮬 레이션 모델의 실행을 통하여 수송구간에서 발생 가능한 교착 상태를 확인하고 이를 해소하기 위한 교착 회피 규칙을 개발한다. 시뮬레이션 실험을 통하여 교착발생 빈도를 기준으로 교착 회피 규칙들의 성능을 비교한다. In this study, the focus is on the issue of whether a container terminal is facing the limitation of its productivity for serving mega-vessels with numerous containers. In order to enhance the terminal operations, a new conceptual design of the container handling system have been proposed. This research focuses on the rail-based container transport system and its operations. This system consists of rail-based shuttle cranes and rail-based transporters called flatcars. The deadlock problem for managing automated transporters in container terminals has been an important issue for a long measurement of time. Therefore, this study defines the deadlock situation and proposes its avoidance rules at the rail-based container transport system, which is required to handle numerous container throughput operations. The deadlock in the rail-based container transport system is classified into two parts: deadlock between cranes and flatcars; deadlock between flatcars. We developed the simulation model for use with characterizing and analyzing the rail-based container transport system. By running the simulation, we derived possible deadlock situations, and propose the several deadlock avoidance algorithms to provide results for these identified situations. In the simulation experiments, the performances of the deadlock avoidance algorithms are compared according to the frequency of deadlocks as noted in the simulations.
잠수함(정)용 고분자 전해질막 연료전지의 이방성 가스확산층의 영향에 대한 연구
서정훈(Jeong Hoon Seo),김동규(Dong Kyu Kim),백현민(Hyun Min Baek) 한국해군과학기술학회 2019 Journal of the KNST Vol.2 No.2
Dead-end mode Polymer Electrolyte Membrane Fuel Cell(PMEFC), emerging as a power of submarine and Unmanned Underwater Vehicles according to anisotropy of Gas Diffusion Layers (GDL) was studied. Dead-end mode PEMFC must execute purge periodically because water accumulates in GDL after response of fuels. Because the deformation happens when fuel cell stack is assembled, the deformation can be differed by difference of physical strength. So, we make a comparison with 0 degree GDL and 90 degree GDL to identify the difference of deformation and purge characteristics. As a result, 90 degree GDL have lower deformation and longer purge period, which means there is longer underwater time of submarine and UUV. This result will be a reference to the development for propulsion capability of future naval submarine and UUV.