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ESS 배터리 충방전 시스템을 위한 8kW급 LLC 절연형 컨버터 설계
김진우,백승훈,조영훈,구태근,Kim, Jinwoo,Baek, Seunghoon,Cho, Younghoon,Koo, Tae-Geun 전력전자학회 2018 전력전자학회 논문지 Vol.23 No.3
In battery-operated systems, an isolated converter is used to interface the utility grid with the system to increase stability when charging and discharging batteries. Systems such as vehicle-to-grids (V2Gs), on-board chargers, and energy storage systems (ESSs) have recently become popular, and the roles of isolated converters have become important considerations in fabricating such devices. A fixed-frequency LLC converter, which is a type of isolated converter, presents the advantages of high efficiency and high power density by performing zero-voltage switching (ZVS) over wide frequency ranges. However, the magnetizing inductance of the LLC converter should be designed to enable ZVS in all switching devices. Therefore, in this study, the operating characteristics of the LLC circuit are analyzed, and an optimal design method for ZVS operation is established. Moreover, an 8 kW LLC high-efficiency and high-power-density resonant converter is designed and tested for ESS application. The LLC converter achieves 98% efficiency at rated power.
시스템 다이내믹스를 이용한 건설 작업자의 불안전한 행동의 인지 과정 모델링
김진우,이현수,박문서,권나현,Kim, Jinwoo,Lee, Hyunsoo,Park, Moonseo,Kwon, Nahyun 한국건설관리학회 2017 한국건설관리학회 논문집 Vol.18 No.2
Finding causes of workers' unsafe behaviors is important to prevent construction accidents because 80 percent of accidents occur by workers' unsafe behaviors. In this regard, this research aims to investigate possible reasons of workers' unsafe behaviors based on workers' cognitive process model using System dynamics. This study is based on two ways of workers' cognitive process which are in relation to hazard perception and failure of hazard perception. Based on existing literature, causal loops for workers' cognitive process are developed to explain workers' habituation by staying out of accidents, safety learning by experience, failure of hazard perception, and attitude change by accidents. The interactions between the developed loops provide managerial insights to reduce workers' unsafe behaviors from a safety manager's perspective including increasing the probability of workers' hazard perception through knowledge management, maintaining workers' positive attitude toward safety, and controlling first-line supervisors to eliminate workers' unsafe behavior. The research allows us to better understand the causes and solutions of workers' unsafe behaviors in workers' cognitive perspectives. 건설재해의 직접적인 원인은 작업자의 불안전한 행동과 작업장의 불안전한 상태로 분류할 수 있다. 그러나 작업자의 불안전한 행동의 원인은 불안전한 상태에 비해 상대적으로 발견이 어렵다. 왜냐하면 불안전한 행동은 개인의 인지과정을 거쳐 순식간에 발생하기 때문이다. 따라서 작업자 인지과정모델을 통해 불안전한 행동의 원인을 밝히고 그 관리방안을 밝히는 것이 본 연구의 목적이다. 작업자의 인지과정모델을 개발하기 위해 피드백 관계를 규명하기에 알맞은 시스템 다이내믹스 방법론을 사용하였다. 개발된 인지과정모델은 작업자가 위험을 인식하지 못하는 그 상황 자체의 위험성에 대하여 강조하였으며 작업자가 위험을 인식 하였더라도 불안전한 행동을 할 수 있음을 나타냈다. 또한 불안전한 행동이 바로 사고로 이어지지 않는다는 습관은 작업자의 안전에 대한 부정적 태도인 태도로 이어진다는 점에 대해서도 규명하였다. 이러한 분석은 건설현장의 안전관리자가 작업자의 인지상태를 관리하는데 도움이 될 것이다.
AUTOSAR 표준 기반인 바디시스템 소프트웨어의 개발 기술
김진우(Jinwoo Kim),이우택(Wootaik Lee),홍성준(Soungjoon Hong),오승호(Sungho Oh),이광열(Kwangyeol Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents an overview of AUTOSAR's software modules and its application to the body systems. The implementation of the body systems adopts state-of-the-art automatic code generation method to enhance the development process. A current automotive electric/ electronic(E/E) architecture has a number of requirements which are legal enforcement, passenger convenience, driver assistance and dynamic drive aspects. These requirements makes the E/E architecture more complex to manage. As a result, automotive OEMs and their suppliers need to collaborate more closely, and Leading OEMs and Tier 1 suppliers recognize this to be an industry-wide challenge and decide to work together to address it. AUTOSAR(AUTomotive Open System ARchitecture) is established an open standard for automotive E/E architecture. It will serve as a basic infrastructure for the management of functions within both future applications and standard software modules. The software of body system based on AUTOSAR standard has flexibility for product modification, scalability of solutions across product lines, and improved quality.
ISO 26262을 위한 저가 MCU기반 소프트웨어 플랫폼 설계
김진우(Jinwoo Kim),차현철(Hyunchul Cha),정승연(Seungyeon Jeong),김창선(Changsun Kim),황창국(Changkook Hwang) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The automotive E/E system is faced with various requirements increase and the short development time. Therefore, the latest software architecture needs to design a reusable platform and a standard platform. Besides, ISO26262 and IEC 61508 require Safety mechanism. So a legacy software platform has to develop the functional safety that is defined ISO26262 and IEC 61508. In order to combine a using software platform and safety mechanisms, it is defined and analyzed failure modes of developed software platform. But to apply the safety mechanism of highly diagnostic coverage, these are composed of special HW and redundancy mechanisms. The case leads to increase the unit cost. So it is important to select compatible safety mechanisms for measuring failure modes. This paper suggests safety mechanisms that apply to a low grade MCU and design guide-lines in a development process.
김진우(Kim, Jinwoo) 한국실내디자인학회 2014 한국실내디자인학회 학술대회논문집 Vol.2014 No.6
This paper aims to describe the goals, process, and outputs of the class of the 『Form and Space』in Interior Design Department at Konkuk University in 2013. This course is composed with 3 steps which are 1) Design principles and characteristics of the theory to understand the process, 2) Explorations of two and three-dimensional composition through manipulation of shape, color, and texture, 3) Observe, analyze, and discuss about other students’ outputs to define a deepening process. Training process is organized with 3 projects called “from 2D to 3D”, “from Image to Form and Space”, and “from Concept to Form and Space“. Students have to find out one keyword from formative principles such as contrast, proportion, movement, rhythmical, directional, and so on, fry to express the keyword to form and space by using form, color, and materials. Despite of preparation period for this class, author has to admit that there was unexpected limitations and problems of curriculum while the class was running, sincerely hope for exchanging and discussing about informations and know-hows concerning about basic design courses with colleagues and professionals who have had more and longer experience in this area.