• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2002년도 춘계학술대회 논문집
• /
• pp.437-445
• /
• 2002

The development of railway vehicle and bogie involves the proper selection of design parameters not only to achieve high speed of the train but also to reduce the vibration. In this study, an analytical model of a high speed freight car is developed to find the critical speed. The high speed freight car can generate the snake motion of the lateral, rolling and yawing motion of the car body and the bogie. The numerical analysis for the equation motions with 17 degrees of freedom showed the running stability and the critical speed due to the snake motion. Also the vibration modes of the high speed freight car was calculated using ADAMS RAIL software, which showed that the critical speed have the yawing modes of the car body and the bogie.

• 대한안전경영과학회지
• /
• 제3권2호
• /
• pp.181-188
• /
• 2001

This paper deals with a newly developed direction indicator system of a car which displays left turn and U-turn signal differently, so that the following driver can identify the intent of the next car ahead easily. In general, when a car want to change its direction, the driver move the blinker lever below the steering wheel up or down. However, as the left turn and U-turn signal are the same, there always be the risk of rear-end collision by misinterpreting U-turn signal as left turn signal. In this paper, a new direction indicator system which differentiates left turn and U-turn signal is developed. The left turn signal is the same as before, but when a driver want to U-turn, an additional U-turn signal blinks at the rear of the car. By identifying the direction signals clearly, the developed system is expected to alleviate the risk of car accident.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2002년도 추계학술대회 논문집(I)
• /
• pp.193-201
• /
• 2002

The development of railway vehicle and bogie involves the proper selection of design parameters not only to achieve high speed but also to reduce the vibration of the train. In this study an analytical model of a high speed freight car is developed to find the critical speed. The high speed freight car can generate the snake motion of the lateral and yawing motion of the car body, the bogie, and the wheelset. Numerical analysis for the nonlinear equation motions with 17 degrees of freedom showed the running stability and critical speed due to the snake motion. Also, the vibration modes of tile high speed freight car was calculated using ADAMS RAIL, which showed that the critical speed have the yawing modes of the car body and the bogie. Finally, this paper shows that the snake motion of the vehicle can be controlled with the modifications of the design parameters.

• 한국정보통신학회논문지
• /
• 제18권8호
• /
• pp.1869-1876
• /
• 2014

자동차 후방카메라 시스템은 후진시 차량 후방을 모니터 영상으로 보여주어 인명보호와 주차의 편리, 운전자의 안전 운전을 위한 다양한 서비스를 제공한다. 본 논문에서는 우리나라가 독자 개발한 개인용 무선통신 Binary CDMA 신기술을 이용하여 설치가 자유롭고 설치비용과 기술료를 절감할 수 있는 자동차 후방카메라 시스템의 개발방법 및 설계에 관해 연구하였다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 1998년도 추계학술대회 논문집
• /
• pp.464-475
• /
• 1998

The study was carried out about the design of Power Car for Korean High Speed Train of maximum operating speed of 350㎞/h. At 350㎞/h, air resistance accounts for by far the greater part of overall resistance to forward motion. So, The Power Car's shape has to be largely determined by aerodynamic considerations. In a multiple unit such as the KHST, the two power cars assume the role of a locomotive. They accommodate all the machinery for providing traction. The train is controlled and monitored from power cars. The mechanical portion of KHST Power Car is the subject of this paper, which focuses on aerodynamics, mass balance, the car body and the layout of the equipment that is fitted into power car.

• 자동차안전학회지
• /
• 제14권4호
• /
• pp.84-90
• /
• 2022

With the popularization of autonomous driving technology, safety has emerged as a more important criterion. However, there are no assessment protocol or methods for AES (Autonomous Emergency Steering). So, this study proposes AES assessment protocol and scenario corresponding to collision avoidance Car-to-Car scenario of Euro NCAP in order to prepare for obstacles that appear after the emergency steering of LV (Leading Vehicle) avoiding obstacles in front of. Autoware-based autonomous driving stack is developed to test and simulate scenario in CARLA. Using developed stack, it is confirmed that obstacle avoidance is successfully performed in CARLA, and the AES performance of VUT (Vehicle Under Test) is evaluated by applying the proposed assessment protocol and scenario.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2022년도 춘계학술대회
• /
• pp.694-696
• /
• 2022

본 연구에서는 KIA의 K3 중고차 가격을 예측하기 위해 2013년부터 2021년까지 K Car 사이트에 등록된 자동차의 데이터를 사용하였으며, 상관분석에서 사용할 변수는 연식, 사고유무, 주행거리, 연료, 배기량을 사용하였다. 이 데이터를 토대로 상관관계를 분석하기 위해 Google Colab 플랫폼을 사용하였으며, 분석을 통해 중고차 가격에 대해 상관관계의 여부를 알 수 있었다.

• IMMUNE NETWORK
• /
• 제22권1호
• /
• pp.6.1-6.19
• /
• 2022

Chimeric antigen receptor (CAR) T cells, which express a synthetic receptor engineered to target specific antigens, have demonstrated remarkable potential to treat haematological malignancies. However, their transition beyond haematological malignancy has so far been unsatisfactory. Here, we discuss recent challenges and improvements for CAR T cell therapy against solid tumors: Antigen heterogeneity which provides an effective escape mechanism against conventional mono-antigen-specific CAR T cells; and the immunosuppressive tumor microenvironment which provides physical and molecular barriers that respectively prevent T cell infiltration and drive T cell dysfunction and hypoproliferation. Further, we discuss the application of CAR T cells in infectious disease and autoimmunity.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2007년도 춘계학술대회 논문집
• /
• pp.591-592
• /
• 2007

• 한국화재소방학회논문지
• /
• 제31권1호
• /
• pp.89-97
• /
• 2017

본 연구에서는 서비스센터에서 정비를 받고 출고한 날로부터 5일 후 터널 주행 중에 발생한 디젤승용차 화재 사례를 조사분석하였다. 조사분석한 결과, 배기구 내부에 흰색 이물질이 다량 부착되어 있었고, 배기관의 중간에 설치된 diesel particulate filter (DPF) 위쪽의 차열재가 용융 및 소실되어 있었고, DPF 위쪽의 차실 내부 금속재 바닥이 천공되어 금속재 바닥 위에 놓인 고무매트가 연소된 케이스이었다. 그리고 DPF 앞쪽의 배기관에는 과열흔적이 없고 DPF부터 배기구까지의 배기관에 과열흔적이 있는 특이점이 있었다. 이러한 특이점들은 DPF가 과열되고 DPF에서 발화된 경우에만 나타나므로 이 승용차화재는 DPF 내부 과열에 의해 발생한 것으로 분석할 수 있었다. 그리고 이 승용차화재조사를 통해 디젤승용차 화재원인조사 과정에서 배기구 내부에서 흰색 이물질이 확인되는 경우에는 DPF를 분리하여 DPF 내부의 손상을 조사하여 화재원인을 판정하여야 함을 알 수 있었다.