항공 재료 : 차량용 주석 도금된 구리 커넥터에서 미세진동에 의한 전기접촉 저항변화에 관한 연구

유환신 ( Hwan Shin Yu ),박형배 ( Hyung Bae Park ) 한국항행학회 2008 韓國航行學會論文誌 Vol.12 No.6

블루투스 4.0 기술을 이용한 차량용 보안인증 시스템 설계

유환신(Hwan-Shin Yu) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.7

블루투스 4.0은 다양한 기기간의 통신에 활용되어 사물 인터넷에 적합한 기술이다. 자동차와 접목하여 서비스를 창출에 적합하다. 본 논문에서는 사물 인터넷 서비스의 구현 사례로, 블루투스 4.0 기술과 차량용 시스템을 연계하여 보안인증 체계를 설계한다. 보안 인증을 위한 절차를 설계하고, 데이터 서버를 활용한 인증 방법을 제안한다. 보안 인증 기능을 제공시, 위험 알림, 사용자 행동 이력에 대한 정보 수집 기능을 활용하여 다양한 부가 서비스를 창출할 수 있다. 또한 블루투스 기술과 기술의 표준화 및 발전 과정에서 소비전력을 낮춘 저전력 상에서 통신이 가능하고 접근성을 높인 무선통신 기술인 BLE(Bluetooth Low Energy) 기술을 접목하여 RFID 또는 NFC 방식을 활용하여 배터리 수명을 개선하고 인식 가능한 범위를 확장하였다. 비접촉식으로 인증 가능한 범위를 확장되어 보안 서비스를 확대할 수 있다. 본 논문에서 제안한 시스템을 활용하면 기존 무선 주파수(Radio Frequency) 기반 시스템의 문제점과 휴대성 및 배터리 사용 문제를 극복하면서, 맞춤형 서비스를 제공할 수 있다. Bluetooth 4.0 is a technology suitable for the Internet of things that is used for communication between various devices. This technologyis suitable for developing aservice by combining with automobiles. In this study, a security authentication system was designed by linking Bluetooth 4.0 technology and a vehicle system as an implementation example of an object internet service. A procedure was designed for security authentication and an authentication method is proposed using a data server. When the security authentication function is provided, various additional services can be developedusing the information collection function of the risk notification and user action history. In addition, BLE (Bluetooth Low Energy) technology, which is a wireless communication technology that enables low-power communication and low-power communication in the process of the standardization and development of Bluetooth technology and technology, improves the battery life through the use ofRFID or NFC This studyexpanded the range possible. The security service can be extended by expanding the scope of authentication by the contactless type. Using the proposed system, a customized service can be provided while overcoming the problems of an existing radio frequency (RF)-based system, portability, and battery usage problem.

WiFi 네트워크 시스템을 활용한 차량 관제용 네트워크의 설계 및 구현

유환신(Hwan-Shin Yu) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3

차량의 자율주행을 위한 최근의 연구는 매우 활성화되고 있고, 안전운행을 보조하고 운전자의 편의성을 향상시키기는 추세이다. 자율주행 차량은 인공지능의 결합, 영상인식 능력과 더불어 사물간의 인터넷 통신이 필수인 상황이다. 모바일 이통통신 네트워크는 처리하는데 한계가 있기 때문에, 쉽게 구현이 가능하고 확장이 용이한 Wi-Fi 네트워크를 활용하여 확장한다. 이러한 차량 관제용 네트워크를 구축하기 위한 무선 설계방식을 제안한다. 이동 단말장치의 데이터 송수신의 손실을 최소화하기 위한 AP의 배치 구성과 소프트웨어 구성방식을 제안한다. 제안한 네트워크 시스템의 설계를 통해서 이동 차량의 통신성능을 비약적으로 높일 수 있다. 또한 다양한 단말장치의 이동에 대한 실험을 통해, 차량용으로 사용할 수 있는 GPS, 영상, 음성 및 데이터 통신의 패킷 구성을 검증한다. 이러한 무선 설계기술을 2.4GHz, 5GHz 및 10GHz Wi-Fi 등의 다양한 범용 무선 네트워크에 확장적용이 가능하다. 또한 무선 지능형 도로망과 자율주행과의 연동이 가능하다. Recent researches on autonomous driving of vehicles are becoming very active, and it is a trend to assist safe driving and improve driver"s convenience. Autonomous vehicles are required to combine artificial intelligence, image recognition capability, and Internet communication between objects. Because mobile telecommunication networks have limitations in their processing, they can be easily implemented and scale using an easily expandable Wi-Fi network. We propose a wireless design method to construct such a vehicle control network. We propose the arrangement of AP and the software configuration method to minimize loss of data transmission / reception of mobile terminal. Through the design of the proposed network system, the communication performance of the moving vehicle can be dramatically increased. We also verify the packet structure of GPS, video, voice, and data communication that can be used for the vehicle through experiments on the movement of various terminal devices. This wireless design technology can be extended to various general purpose wireless networks such as 2.4GHz, 5GHz and 10GHz Wi-Fi. It is also possible to link wireless intelligent road network with autonomous driving.

차량용 네트워크 활용을 위한 5GHz WiFi 설계 및 분석

유환신(Hwan-Shin Yu) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.8

사물인터넷 기술의 발전에 따라 사물 간 데이터 통신이 확장되고 있는 추세이다. 관련 기술을 차량에 접목하고자 하는 차량간 데이터 통신기술과 관련된 연구가 활발히 진행되고 있다. 이동식 단말의 데이터 통신을 위해서는 데이터 안정성과 신뢰성, 실시간성이 보장되어야 한다. 무선 네트워크의 대역폭과 통신 속도, 무선 포화도에서 유리한 5GHz Wi-Fi 대역을 차량간 데이터 통신 네트워크로 선정하였다. 5GHz Wi-Fi 네트워크를 차량용 네트워크에 설계 및 구현하기 위한 분석을 진행한다. 이동통신 단말장치의 특성을 고려하고 고속데이터 스위칭이 가능하도록 연속적 가변 통신 구조를 제안한다. AP접속 절차를 단순화해 무선 단말 간 접속시간 지연을 줄인다. TCP/IP기반 DHCP 서버 기능을 제한하고 동보전송 프로토콜 방식으로 구현함으로써, 단말장치간의 통신지연을 개선한다. 일반적인 상용 Wi-Fi 통신 방식과 대비하여, 접속 동작 및 반응속도가 5초 이상 향상되었다. 이 방식을 활용하여 차량 간 다양한 이벤트 데이터 통신에 확장 적용이 가능하다. 또한 무선 데이터 기반 지능형 도로망과 자율주행을 위한 체계로 확장이 가능하다. With the development of water internet technology, data communication between objects is expanding. Research related to data communication technology between vehicles that incorporates related technologies into vehicles has been actively conducted. For data communication between mobile terminals, data stability, reliability, and real-time performance must be guaranteed. The 5 GHz Wi-Fi band, which is advantageous in bandwidth, communications speed, and wireless saturation of the wireless network, was selected as the data communications network between vehicles. This study analyzes how to design and implement a 5 GHz Wi-Fi network in a vehicle network. Considering the characteristics of the mobile communication terminal device, a continuous variable communications structure is proposed to enable high-speed data switching. We simplify the access point access procedure to reduce the latency between wireless terminals. By limiting the Transmission Control Protocol Internet Protocol (TCP/IP)-based Dynamic Host Configuration Protocol (DHCP) server function and implementing it in a broadcast transmission protocol method, communication delay between terminal devices is improved. Compared to the general commercial Wi-Fi communication method, the connection operation and response speed have been improved by five seconds or more. Utilizing this method can be applied to various types of event data communication between vehicles. It can also be extended to wireless data-based intelligent road networks and systems for autonomous driving.

차량용 블랙박스 및 초소형 시스템을 위한 차선이탈 경보 알고리즘 최적화

유환신(Hwan-Shin Yu) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.10

Recent market penetration of automotive black-boxes are being popularized and is causing competition for those products. So the universal tendency add features to take advantage of the video along with the basic features of the black-boxes. In this paper, minimize the image processing operation for the lane departure warning on the treatment process of the recorded image and the live image output operation of the vehicle black box system dynamically based on the image resolution and field of view lens. According to the unit area of the region of interest for detecting the external condition of the lane system, to optimize the amount of computation in real time operating system is required (Real Time Operating System: RTOS) for use in the method based or microcomputer-based system solution is proposed. To conduct a performance evaluation by the proposed method to optimize the performance seems to improve it.

차량용 블랙박스 시스템을 위한 최적화된 파일시스템 설계

유환신(Hwan-Shin Yu),정의붕(Eui-Bung Jeoung) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.2

The market situation of vehicle black boxes that have been widely popularized recently stirs a market competition of the product and there is an apparent growing trend towards the use of the images from these black boxes in various situations. However, there are some problems caused by saving data in SD cards. Storage hours is not long enough and omissions or errors of saved data occur very often due to the deficiency of durability from repetitive overwriting. In the study, processing operation is suggested to improve the efficiency of durability of the storage of real time-saving image or various data and minimize processing steps then suggest utilization method that requires real time or microcomputer based solutions. The proposed scheme or plan is measured against FAT32 method which is widely applied and it shows that there is improvement of the performance under the optimization situation and minimize processing steps then suggest utilization method for RTOS based system which requires real time or microcomputer based solution.

차량용 블랙박스 파일시스템의 복원 및 검색기능 강화 알고리즘

유환신(Hwan-Shin Yu) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.10

Reliable reproduction and restoration of recorded data on car black boxes becomes one of the most important issues to address. In order to safely reproduce the data, their successful retrieving and restoring can be done well should be considered from storing them together with performance and environment of storage media. In this paper, we proposed an algorithm to smoothly handle the search, playback and restore operations of the car black box system. The proposed algorithm divides the areas of the file system and performs the search index backup process whenever reaching each threshold for doing recorded data sorting. Depending on the restoration and retrieval conditions, this algorithm optimizes the computational complexity and distributes the number of writes considering performance and life time of storage medium used. Experimental results show the proposed algorithm outperforms the FAT32-based file system in terms of recovery capability.

차량용 블랙박스 기반 어라운드 뷰 모니터링 시스템의 차선인식 강화 알고리즘

유환신(Hwan-Shin Yu),정의붕(Eui-Bung Jeoung) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.1

The Around view monitor system is a trend that is spread around a luxury vehicle with adding another features as well as the ability to view the original shadow area or a rectangular area. In this paper, we view images from around the environment and improve the errors in the lane departure warning system and algorithm of vehicle black box small embedded systems. In particular, in the method of using only the front image, it proposes an optimized recognition algorithm to recognize left / right to the image and a rear image. Accordingly, real-time is required for the operating system: observation of peripheral through-around view image in (Real Time Operating System RTOS) based system, and a microcomputer-based solution, and utilized through the recognition of the video, and smoothly use the vehicle black box function, it seems, for optimized performance in 5~15%.

자이로와 가속도 센서를 이용한 차륜형 도립진자 이동로봇 제어

유환신 ( Hwan Shin Yu ),박형배 ( Hyung Bae Park ) 한국항행학회 2012 韓國航行學會論文誌 Vol.16 No.4

본 논문은 비선형성이 내재된 모바일 역진자형 로봇 시스템의 제어기 성능을 개선하고, 위치와 속도제어를 위하여 두 개의 다룬 휠로 구동되는 역진자형 타입의 모바일 로봇으로 모델링하였다. 이 시스템은 파라미터의 변화를 실시간으로 체크하고. 제어신호는 여러 상황에서 시스템이 원하는 상태를 유지하도록 변화하게 구성하였고, PI 제어기로 설계하였다. 시스템이 불안정하므로 시스템의 안전성 판별을 통하여 PI 제어기의 게인 값을 설계하였다. 위 실험 결과로서 수동 튜딩 방법 보다 터 좋은 적절한 방법의 성능을 얻을 수 있었다. This paper proposes the improvement of control performance in the wheeled inverted mobile robot system. and describes the modeling of a wheeled inverted pendulum type mobile robot driven by two different wheels for the position and velocity control. The system is sensitive on the parameter variation, therefore control signal should change to maintain desired state of the system in every instant. we designed proportional-plus-integral controller for our system, After linearization, the system was still unstable, throughout stability analysis of the system, we designed the values of the gains of a proportional-plus-integral controller. From the experimental results, we can find that the performance of the proposed method is better than of the manual tuning method.

블루투스 4.0 기술을 이용한 차량 간 충돌방지 알고리즘 설계 및 구현

유환신(Hwan-Shin Yu) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.5

Bluetooth 4.0 is a technology suitable for Internet of things, and can be used in various environments. In this paper, iBeacon technology based on Bluetooth 4.0 is implemented in the vehicle, and the position and distance between the vehicles are identified and the system is designed and implemented to inform the driver of the risk. Based on iBeacon’s location-based information gathering technology, it overcomes the problems of existing ultrasonic based system and suggests ways to overcome cost increase problems in commercialization. In analyzing the collected information, the range of recognition is extended not only to the vehicle but also to fixed devices and user terminal devices by analyzing the distance between various secured objects. Based on this system, it is possible to provide the safe driving function of the intelligent intersection and the access road, and the utilization can be expanded to the use of the pedestrian’s safe pedestrian crossing.