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차량의 안전 향상을 위한 ISO 26262에 보안을 고려한 통합적 분석 방법
정지현(Jihyun Jung),민상윤(Sangyoon Min) Korean Institute of Information Scientists and Eng 2018 정보과학회논문지 Vol.45 No.11
Recently, new technologies and services such as autonomous driving, Connected Car, ADAS and V2X have been applied to vehicles. With more than 1G byte of code and more than 70 ECUs, the automotive is continuously getting complex and connected. These situations have led to the emergency of security problems along with increase in security risks. However, there respectively exist safety processes dealing with automobile safety and security processes dealing with security, so that automobile safety problems arising from security threats are not prepared. Furthermore, ISO 26262 Second Edition calls for consideration of the mutual influence of security and security. In this paper, we propose an integrated analysis method considering security in ISO 26262 with aim of contribution towards improvement the safety of the vehicle.
통합제어를 이용한 Split_μ 노면에서의 제동 시 차량의 거동안정성 향상을 위한 연구
정지현(Jihyun Jung),윤상호(SangHo Yoon),구본경(BonGyeong Koo),김동신(Dongshin Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Purpose of this study is to improve yaw stability of the vehicle while braking on the split_μ road with UCC that is consist of ESC and EPS. ESC system needs the additional control logic to calculate Steering Assist Torque using the estimated wheel pressures and measured yaw rate. And then, ESC system communicates the Steering Assist Torque to EPS system by CAN. When EPS system receives this value, it turns front wheels forward low_μ surface. It is ultimately to enhance yaw stability of the vehicle. For this reason, it is possible that vehicles go straight while braking on the split_μ road. Winter Test in China is performed to acquire the real car test results on the split_μ road that is made of ice and dry asphalt road. In this paper, the structure of UCC control logic and the test results of UCC system for yaw stability of the vehicle while braking on the split_μ road are shown.
Hybrid Brake System의 Clamping force 보상 제어
정지현(Jihyun Jung),김명준(Myoungjune Kim),김주곤(Joogon Kim),정대종(Daejong Jeong) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
EMB is a suitable brake model on the trend of the safety devices, the convenient devices and the eco-friendly devices. It is the equipment to brake using motors instead of hydraulic pressures. This paper describes the system overview of the EMB, braking control principles and clamping force compensation algorithm. EMB System requires the motor device while braking, not the existing hydraulic device. EMB is the device that Motor rotation movement converts to the straight movement and this straight power converts to the clamping force while braking. But the clamping force varies with the friction and Assembly of gears. Therefore clamping force is not easy to estimate in the current control. Furthermore clamping force control is not the same in a common CBS situation even if the two sides of the wheel EMB actuator receive the same current command. Difference of the clamping force means the difference between the left and right actuators. It is disadvantageous to the stopping distance and stability of the vehicle. Therefore clamping force compensation algorithm is used to compensate the difference in the clamping forces. First, the current vs. clamping force map is made by actuator. To eliminate the differences of the two clamping forces of the actuator, it needs that to find the current control value corresponding to the needed clamping force with the current vs. clamping force of map of the standard actuator. As a result of the test with the current control, the control value is changed to meet the same amount of clamping force due to the actuator performances.
정지현(Jihyun Jung),황인철(Inchul Hwang),보하라(Padam Bahadur Bohara) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
A demand for the car security technologies is increasing as vehicle prices and exports of car are ascending. Especially Microbus need appropriate security technologies to cover their large interior volume. In this paper we introduce a security system which is redesigned to be suitable to Microbus based on the intrusion detection system of Sedans. The security system is composed of two ultrasonic sensor modules which have two TX sensor and one RX sensor. Dark current ascent and ultrasonic sensor transmission collision problems due to implantation to Microbus have been solved by sequence control between modules. This intrusion detection system for Microbus has verified by vehicle test using shuttle bus, and we confirmed that it has the equivalent performance with intrusion detection system of Sedans and the detect extent covers all the passenger seats in the Microbus.
다문화 리터러시 교육 프로그램 참여 고등학생의 다문화 인식에 관한 연구
정지현(Jung, Jihyun),김영순(Kim, Youngsoon),홍정훈(Hong, Junghoon) 한국열린교육학회 2014 열린교육연구 Vol.22 No.2
본 연구는 다문화 리터러시 교육 사례로 청소년다문화유레카 프로그램을 소개하고, 이 프로그램에 참여한 고등학생들의 다문화 인식을 살펴보는데 연구의 목적이 있다. 본 연구를 위해 연구참여자들의 성찰일지와 인터뷰, 참여관찰자의 관찰일지와 인터뷰 등의 자료를 수집하여 분석하였다. 유레카 프로그램은 학습자 중심적 학습, 실제성 학습, 체험적 학습, 협동학습, 자기 성찰적 학습을 통한 과정 중심의 체험학습 활동으로 이루어졌다. 프로그램 진행 과정에서 고등학생들의 다문화 인식을 살펴보면 다문화적 지식습득의 단계에서 학생들은 소수 집단의 시각에서 문제와 사건들을 인식할 수 있는 관점을 가지고 지식을 재구성하는 것을 볼 수 있었다. 또한 다문화적 태도 형성의 단계에서 학생들은 다양성에 대해 수용성을 획득하여 다문화적 관계 형성 능력과 개방성을 함양해 가고 있었다. 그리고 다문화적 행동 기술 실천의 단계에서 학생들은 열린 태도와 문화 간 소통 능력을 확장하여 주변인의 인식 개선을 위해 행동하는 모습을 확인할 수 있었다. 본 연구의 결과에서 유레카 프로그램은 다수 고등학생들의 인식의 변화를 도모할 뿐만 아니라 다수 청소년들을 위한 다문화교육의 목표로 나아가는 출발점이 되고 있었다. 그리고 유레카 프로그램은 실제 세계와 관련된 체험적 지식을 바탕으로 고등학생들이 문제 해결 능력을 획득하고 자신의 문화와 서로 다른 문화와의 차이를 수용하고 존중할 수 있는 다문화교육의 목표를 지향하고 있음을 알 수 있었다. 따라서 다문화 리터러시 교육 프로그램이 국경없는 마을의 지역적 특성을 떠나 광범위하게 적용되기 위해서 유레카 프로그램과 같은 사례가 더 많이 발굴되는 등의 보다 심층적인 연구가 요구된다. This study was designed to introduce the Youth Multicultural Eureka Program (Eureka program) as the example program for multicultural literacy and to calculate multicultural recognition of high school students who participated in this program. Research results were analyzed according to research participants' and program participants' reports and interviews. The Eureka program is composed of learner-centered learning, practical learning, experimental learning, cooperative learning, and self-examination learning. In the stage of knowledge acquisition, students restructure knowledge in the aspects of recognizing the situation toward minority groups during this program. They admit variety of others and form ability of multicultural relationship formation and openness. Also, students can extend communication ability between cultures and attitude toward openness in their practice stage. The findings of this study are follows. Firstly, the Eureka program can promote the changes of multicultural perception for high school students. Secondly, this program plays an important role as a starting point of multicultural education. In addition, the results show that the Eureka program contributes to the growing ability of problem solving and learning cultural diversity in terms of the high school curriculum. This study proposes that the multicultural literacy education programs, like the Eureka program, are widely applicable for many high schools beyond the Border-less Village.