• 철도저널
• /
• 제12권5호
• /
• pp.20-24
• /
• 2009

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2006년도 춘계학술대회 논문집
• /
• pp.1108-1111
• /
• 2006

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2003년도 춘계학술대회 논문집
• /
• pp.1499-1502
• /
• 2003

This paper describes the result of carbody and vibration test for freight car. The purpose of the test is to evaluate an safety which carbody structure shall be considered fully sufficient rigidity so as to load a freight car under maximum load and operating condition on line track. The test carbody is constructed by RS korea co., LTD. in accordance with KNR specfication. The test cases of the carbody is tested the vertical load and compressive load to verify the strength and stillness. The vibration test is tested for analysis and evaluation of vibration, to allow for the fact that mechanical vibration in railway vehicles have specific characteristics.

• 한국철도학회논문집
• /
• 제4권3호
• /
• pp.116-122
• /
• 2001

As freight traffic becomes heavier, the high speed of existing freight cars is essential, instead of the construction of a new railway. The high speed can be achieved by the modifications of freight bogie design. In this paper, an analytical model of freight bogie is developed to decide the critical speed. The dynamic responses of the analytical model are compared with the experimental data from a running test of freight bogie and showed good agreements between them. The analytical model is used to find the design of freight bogie. The parameter studies show that the reduction of wheelset mass ratio and the increase of the axle distance of freight bogie can increase the critical speed, but the primary lateral stiffness has little effects on the critical speed. And this study also shows that smaller wheel conicity deteriorates the running safety of freight car, which means that the overhauling of the wheel of freight bogie should be done regularly.

• 한국식생활문화학회지
• /
• 제4권3호
• /
• pp.221-227
• /
• 1989

조선시대(朝鮮時代)에 육대(六大) 차류(茶類)의 전래여부(傳來與否)와 국내생산(國內生産) 여부(與否)를 고찰(考察)한 결과(結果) 다음과 같은 사실(史實)이 확인(確認)되었다. 1. 중국(中國)으로부터는 화차(花茶)인 향편차(香片茶), 청차(靑茶), 흑차(黑茶)가 전래(傳來)되었고, 일본(日本)으로부터는 홍차(紅茶)가 전래(傳來)되었다. 2. 이 중(中)에서 화차(花茶), 황차(黃茶), 흑차(黑茶)는 국내(國內)에서도 생산(生産)되었다.

• 한국자동차공학회논문집
• /
• 제10권6호
• /
• pp.194-201
• /
• 2002

In this study is presented a numerical method which assesses running safety of the freight car loading with loom CWR and structural safety of conventional railway track and fastening when passing over sharp curves and steel girder bridges. Optimal speed of the freight car is suggested based on the numerical reviews of the safety against derailment of the freight car and structural safety of track and fastening at vulnerable points of the conventional line.

• 한국소음진동공학회논문집
• /
• 제20권4호
• /
• pp.373-380
• /
• 2010

An interest is increased of environment and energy so, importance on railroad high energy efficiency is magnified. And after Gyeong-bu High speed rail is completed, share rate freight transportation of railroad is expected to be gradually increased due to expand investment for railroad and operate mainly freight transportation on convention line. Therefore a research on DMT freight cars is necessary under like this situation. In paper, we developed analysis model for DMT freight car and DMT freight was analyzed numerically using VI-Rail in each condition of railway having different curve and carried out vibration analysis on curving using developed analysis model. And we carried out test on driving stability follow changing curve radius then measure against UIC code 518.

• 한국식품영양과학회지
• /
• 제18권1호
• /
• pp.34-39
• /
• 1989

쌍화차의 제조공정중 추출은 용매를 50% etanol 로 하고 그 첨가량은 원료량의 10배로 하였을 때 가장 수율이 높았고, 추출온도 및 시간은 $90^{\circ}C$ water bath에서 8시간 추출하는 방법이 가장 효과적으로 생산비를 절감할 수 있었다. 또한 특수성분의 HPLC분석 결과는 50% ethanol로 추출한 제품이 물로 추출한 것보다 높은 양을 나타내었고 특히 Decursinol성분의 경우에 물추출로는 38.59 PPM, 50% ethanol추출로는 298.02PPM으로 가장 현저한 차이를 나타내었다.

• 한국철도학회논문집
• /
• 제6권3호
• /
• pp.149-155
• /
• 2003

The development of railway vehicles 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 freight car is developed to find the critical speed. The 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 the 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.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2008년도 춘계학술대회 논문집
• /
• pp.1005-1006
• /
• 2008