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시스템엔지니어링 기법 적용에 따른 경량전철시스템 요구사항체계 구축에 관한 연구
허재훈(Jae-Hun Heo),배준호(Joon-Ho Bae),최원찬(Won-Chan Choi),배성훈(Sung-Hoon Bae),주지영(Ji-Young Joo) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Light Rail Transit is system that offer target Performance and function because various sub-system such as vehicles power supply signaling communication mechanical track civil is consisted as large complex system. Light Rail Transit and the complex system of safety reliability to be a behavior and target performance and function properly to system's configuration design manufacture installation and test verification through operations system requirements to accurately describe what It is more important. With this study light rail system KSX ISO / IEC 15288 system life cycle process by applying engineering techniques utilizing light rail system in the early stages of construction from the concept design production operation maintenance and end-use to the disposal stage throughout the entire life cycle from the beginning of construction until the end of construction of the stakeholder to define requirements analyze the introduction of the system developers and system requirement of those who wish to be described accurately by selecting the best system and system requirement in order to achieve their purpose.
허재훈(Jae-Hun Heo),김아란(A-Ran Kim),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
본 논문에서는 NEV 구동을 위한 스위치 릴럭턴스 전동기의 설계와 특성해석을 수행하였다. NEV의 구동을 위한 SRM의 설계를 위하여 동급의 직류전동기의 특성 및 사양을 분석하고 성능을 만족하기 위한 전동기 설계를 수행하였다. 설계한 SRM의 특성을 기존의 직류전동기와의 특성 비교를 통하여 그 가능성을 검증 하였다.
국제표준 ISO/IEC 15288 기반의 경량전철 전력시스템 검증 프로세스에 관한 연구
최원찬,배준호,허재훈,이상근,한석윤,Choi, Won Chan,Bae, Joon Ho,Heo, Jae Hun,Lee, Sang Geun,Han, Seok Youn 한국시스템엔지니어링학회 2013 시스템엔지니어링학술지 Vol.9 No.1
The object of this study is to define systematically for outputs of Verification Process among the system life cycle process based on ISO/IEC 15288 for power supply system, which is one of the importance sub-systems to configure the LRT system. Furthermore, to prevent various problem in advance that can occur in the Transition LRT's power supply to be completed Integration. For this purpose, traceability of verification requirement and outputs. should be managed to use verification for system requirement and data processing tool. by system engineering techniques of system life cycle process based on ISO/IEC 15288 to LRT system.
상용자석을 사용한 단상 하이브리드 SRM의 설계 및 구동 특성
안진우(Jin-Woo Ahn),허재훈(Jae-Hun Heo) 대한전기학회 2013 전기학회논문지 Vol.62 No.2
Compared to a multiphase SRM, a single-phase SRM has some advantages, such as lower number of switches and power converter size, which leads to gradually increasing in the household appliances and industrial applications. But the torque dead zone is existed in the single-phase SRM which decreases the starting capability of the motor and increases the torque ripple. In order to solve the aforementioned problems, a single-phase hybrid SRM with commercial ferrite permanent magnet is proposed in this paper. Basic design principle for the proposed structure is described. To verify the proposed structure, FEM is employed to get the characteristics of the proposed structure. Based on the analysis, a prototype is designed and manufactured. And, the experimental system is also constructed. The validity of the proposed structure is verified by the experimental results.
시스템엔지니어링 모델 기반의 도시철도 운영시나리오 연구
전서탁(Seo-Tak Jeon),허재훈(Jae-Hun Heo),고재현(Jae-Hyung Ko),민경세(Kyung-Se Min),박범환 (Bum-Hwan Park) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
도시철도 시스템은 다양한 분야의 복잡한 시스템 집합체로 시스템 성능 보증을 통한 열차운행의 안전성 확보를 위하여 계획 단계부터 철저한 준비가 선행되어야 한다. 이를 위해 시스템엔지니어링 모델링을 통한 도시철도 운영시나리오를 구현하고자 한다. 본 논문은 시스템엔지니어링 모델 기반의 열차운행과 관련된 기능흐름을 분석하고 도출된 데이터를 통해 운영시나리오 구성과 검증방안에 대하여 기술하고자 한다 The Urban railway system must be thoroughly prepared from the planning stage to secure the safety of the train operation by guaranteeing system performance as a complicated system assembly of various fields of this, we must consist of an urban railway operation scenario by Systems engineering modeling. In this paper, we are going to describe operation scenario composition and verification plan through the function flow analysis related to train operation based on system engineering model
DVD 시스템에 있어서 DOLBY AC-3 디코더의 실시간 구현에 관한 연구
이원우,김승호,장성철,이희수,허재훈,Lee, Won-Woo,Kim, Sung-Ho,Jang, Sung-Chul,Lee, Hee-Soo,Heo, Jae-Hun 한국음향학회 1996 韓國音響學會誌 Vol.15 No.2
본 연구에서는 20bit 고정 소숫점 범용 DSP 칩을 이용하여 Dolby AC-3 디코더를 실시간으로 구현하였으며, PC를 이용하여 구현한 AC-3 C-simulator와의 성능비교를 통하여 본 연구의 실시간 디코더가 성능이 뒤지지 않음을 보였다. 또한 향후 DVD 재생기에 있어서 본 연구의 AC-3 디코더가 어떻게 설계되었는지에 대해서도 논하였다. 특히 본 연구에서 제안하는 Dolby AC-3 디코더는 최소한의 지연시간을 갖도록하여 기존의 디코더보다 향상된 성능을 가짐을 보였다. A real-time Dolby AC-3 decoder has been implemented using a 20-bit fixed point general purpose DSP chip. It is shown that AC-3 decoder of this paper has same performance as decoder of C-simulator on PC. And also, it is applied to DVD player. Especially, in this paper, we proved that it has shorter latency time than that of previous AC-3 decoder.
안테나 배열형 고출력 모듈의 냉각을 위한 공랭식 유로 형상 최적화 연구
이주현(Ju-Hyun Lee),윤세진(Se-Jin Yoon),이정민(Jung-Min Lee),허재훈(Jae-Hun Heo) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.8
최근 전자 기술의 발전으로 방위산업을 비롯한 다양한 산업 분야에서 고출력 소형 전자 부품이 널리 적용되고 있으며, 이로 인한 다양한 열적 문제에 직면하고 있다. 본 연구는 균일한 간격으로 배열된 안테나의 고발열, 고열유속 부품의 냉각을 위한 공랭식 유로 형상에 대한 최적화에 대하여 수행하였다. 다양한 냉각 핀 유형, 단면 및 길이와 관련된 기하학적 매개변수에 따른 열 성능 영향에 대한 연구로서 이전에 제시된 연구보다 더 많은 형상 매개변수가 고려되었다. 특히, 기존의 최적화 형상 연구들은 부품의 최대 작동 온도와 최대 압력 강하에 초점을 맞춘 반면, 본 연구는 부품의 작동온도, 최대압력 강하와 함께 배열된 부품간의 온도 편차를 줄이기 위한 핀 형상 최적화에 중점을 두었다. 다양한 기하학적 형상에 따른 열적 성능을 평가하기 위한 성능 지수를 정의하여 열적 성능을 비교하고, 최적화된 냉각 핀 형상을 제시하였다. Recently, with the development of electronic technology, small high-power electronic components have been widely applied in various industrial fields, including the defense industry, but researchers are facing various thermal problems. This study was conducted on the optimization of an air-cooled flow-path shape for cooling high-heat-flux components of an antenna arranged at uniform intervals. We studied the effect of the thermal performance on geometric parameters related to different cooling fin types, cross-sections, and lengths, and more geometric parameters were considered than in previous studies. While previous studies on optimized shapes focused on the maximum operating temperature and maximum pressure drop of components, this study focused on optimizing the fin shape to reduce the temperature deviation between the components, as well as the operating temperature and maximum pressure drop of the components. A performance factor was defined to evaluate the thermal performance according to various geometries, the thermal performance was compared, and an optimized cooling fin shape is proposed.
최원찬(Won-Chan Choi),배준호(Bae Joon Ho),허재훈(Jae-Hun Heo),주지영(Ji-Young Joo) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The purpose of this study is based on the optimize the system life cycle cost apply to the advanced systems engineering techniques consideration thought to the system life cycle for the power system which is the one of the major component of the light rail transit system. Generally, the systems engineering techniques apply to the LRT’s power systems are not optimize the whole life cycle cost of the power systems because systems engineering management activities are concentrate in performing the key-technology oriented at the construction stage of the dedicated power systems for light rail transit. Through this study, All the stakeholders can be utilize a this advanced systems engineering techniques which is fully considered the life cycle cost through the considering in whole system life cycle (such as concept, design, operation, maintenance and dispose stage as well as construction stage) and adopted by KSX ISO/IEC 15288 system life cycle processes.