• 융합보안논문지
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• 제19권3호
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• pp.71-79
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• 2019

스마트 자동차에 대한 수요가 급격하게 증가하고 있다. 3GPP와 5GAA와 같은 표준기구에서는 스마트 자동차를 위한 자율 주행 자동차를 포함한 커넥티드 카, 자동차 네트워크 인프라에 대한 표준 통신 프로토콜을 제시하고 있다. 하지만 이와 같이, 스마트 자동차 네트워크 환경에는 기존의 유선 통신 네트워크 보다 더욱 위험할 것으로 예상되는 보안 위협 요소들이 존재한다. 대표적으로 스마트 자동차의 주변 장치들이 신분을 위장하여 차량에 대한 위치정보, 개인 정보 등을 탈취할 수 있을 뿐만 아니라, 스마트 자동차 주변의 인프라 요소들이 공모하여 주행중인 자동차를 위험한 상황에 빠뜨려 생명에 위협을 가할 수도 있을 것이다. 이를 해결하기 위해서, 본 논문에서는 속성 기반 권한 위임 관리 기법과 임계치 암호 알고리즘을 사용해 공모 공격으로부터 안전한 시스템을 제안하였다. 제안한 시스템은 앞서 예로 제시한 공모 공격으로부터 안전할 수 있음을 의미론적 안전 모델을 사용해서 증명하였다.

• 드라이브 ㆍ 컨트롤
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• 제11권4호
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• pp.61-67
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• 2014

When a manual transmission equipped car stops on an incline where the nose of the car is higher than the rear, hill-start control or hill-holder could prevent the vehicle from rolling backward as the car moves forward. The easy-hill assist valve consists of a check valve and a needle type ON/OFF solenoid valve connected in parallel; it is a hydraulic actuator that can maintain brake pressure using an electrical signal from the ECU. As the EHA valve is a safety-related component of the brake system, high reliability as well as superior dynamic performance is required for it to be applied in commercial vehicles. This paper presents the design of the EHA valve as a piece of equipment that can simulate the brake actuation pressure with a pressurizing piston. Following specific test standards, the experimental results validate the implemented functions of the test equipment, proving the test stand to be effective for the performance and endurance of the EHA valve.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.205-208
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• 2008

Generally, there are several types in rear suspension. The rear suspension of subframe type consisting of side member and front/rear cross member is widely used in a medium car and full car. In the small car case, the beam of tubular type without independent suspension system is used to reduce manufacturing cost. The optimized rear suspension of subframe type using hydroforming method has been developed in this study. In designing suspension, the driving stability and durability performance should be considered as an important factor. The stability is related to dynamic frequency and durability is connected with stress analysis of structure. We focus on increasing the stiffness of suspension and decreasing the maximum stress relating to durability cycle life. For making use of the merits of hydroforming which is possible to make the bead, tube expansion, and feeding in desiring position, several optimization design techniques such as shape, size, and topology optimization are proposed. This optimization scheme based on the sensitivity can provide distinguished performance improvement in using hydroforming. Through commercial software based on the finite element, the superiority of this design method is demonstrated.

• 한국자동차공학회논문집
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• 제7권9호
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• pp.75-81
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• 1999

In this paper, the details of electronically controlled CVT is described , which Kia Motor company recently developed in prototype form for hybrid passenger car. This transmission has two input shafts, one for engine and the other for traction motor. The shaft for traction motor is located at rear side which is extended from primary pulley shaft and connected to traction motor through adapter gear box. Adopting two input system, various driving mode is available such as motor alone driving in hybrid vehicle application. As far as electrohydraulic system concerned , this transmission uses two bleed type variable force solenoids for line pressure and ratio control, and one on-off solenoid for clutch control. Another feature for this transmission is that oil pump for transmission is separate from CVT for supplying oil pressure even at vehicle standstill.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 추계학술발표회 발표논문집
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• pp.657-658
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• 2004

The reactor protection system (RPS) of HANARO is a safety class system. The reactor is tripped by dropping four shut off rods (SOR). The SOR system consists of a SOR, hydraulic pump, hydraulic cylinder, solenoid valves and a power supply unit which has the AC coil contactor as a switching component. The hydraulic pump lifts up the SOR. The SOR drops by loss of the hydraulic pressure in the hydraulic circuit at the occurrence of voltage sags or interruptions. From this experiment, we knew that the magnitude of the voltage sag which impacts on this system is 70V, 500msec. The reactor regulation system (RRS) of HANARO has four CARs which are connected to the driver through a magnetic clutch. The CAR drops by loss of electromagnetic force of the magnetic clutch when the deeper voltage sags to lower than 10V, 500msec.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1768-1771
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• 2002

Automatic Transmission System(ATS) was designed to replace the human's manual operation of the gear box. So far, this system operates with the fixed shift pattern information. In this paper, new algorithm considering driver's operation tendency is proposed. Also, to get rid of the uselessly frequent shift of the ATS, the conditions and the status of the vehicle would be included for the evaluation in making a decision of shifting. A field test is done in a car equipped with the computer set connected to Transmission Control Units(TCU) to check the status of the test car, and it shows the excellency of the proposed algorithm.

• 디지털산업정보학회논문지
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• 제14권4호
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• pp.27-33
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• 2018

The recent efforts in academia and industry represent a paradigm shift that will extend the IoT from the home environment so that it is interoperable with the Internet of Vehicles (IoV). IoV is a special kind of IoT. It allows to connect between vehicle and things located in infrastructure. Furthermore, IoV enable to create new intelligent services through collaboration with existing various services such as smart city and connected home. In this paper, we develop a service in order to realize IoV. To this end, we design a novel vehicle service platform which could automatical controlling the IoT device according to drivers' voice. To show practical usability of our proposed platform, we develop a prototype service could be call car-to-thing (C2T). We expect that our proposed platform could eventually contribute to realizing IoV.

• 한국전자파학회지:전자파기술
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• 제26권6호
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• pp.24-30
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• 2015

최근 자동차, 도로, 교통시스템에서 전파서비스의 활용과 안전하고 편리한 자동차 이용에 대한 관심이 증가하고 있다, 커넥티드 카(Connected Car) 서비스는 이러한 이용자 니즈에 따라 등장하여 급속히 관심이 증가하고 있으며, 급속한 기술개발 및 표준화가 진행되고 있다. 이 논문에서는 이러한 동향의 커넥티드 카 서비스에 대한 개념과 기술구성 및 세계 주요국의 정책동향 및 주요 참여기업의 서비스 개발 동향과 표준화 동향을 제시하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 춘계학술대회 논문집
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• pp.27-31
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• 1999

Recently, manufacturing industries, specially connected with car are doing their best to increase productivity and to reduce production time. This paper deals with the machining of profile(core/cavity) of mold die using the commercial CAM system. In this study, the effect of machining condition on precision of die profile is investigated by experimental observation and analysis.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2020년도 추계학술발표대회
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• pp.284-287
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• 2020

현재 자율주행은 Stand Alone 으로 차량 자체적인 센서만을 이용해서 자율주행을 하고 있다. 이번 연구로 Stand Alone 하지 않은 서버 제어 방식의 자율주행 차량 개발이 가능해져 자율주행 차량의 센서와 연산장치가 줄어 차량의 가격이 줄어들며 이 시스템의 궁극적 목표인 자율주행 차량의 사고 감소에 큰 도움을 줄 것을 기대한다.