• The Magazine for Energy Service Companies
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• s.8
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• pp.64-73
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• 2001

미국 에너지부는 지난 2000년 4월 18일 연방 에너지 관리 프로그램의 일환으로 연방정부와 그 산하 기관들에 대한 에너지효율 개선 프로젝트에 대한 재정지원 방법을 규정한 초안을 마련했다. 이 초안은 그해 9월 15일 확정되어 현재 적용되고 있는 것으로 ESCO를 통한 ESPC방법과 설비회사를 통한 UESC방법을 소개하고 있다. 국내 ESCO사업의 발전에 도움이 되고자 그 전문을 3회에 걸쳐 원문과 함께 번역, 게재하기로 한다.

• The Magazine for Energy Service Companies
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• s.9
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• pp.66-72
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• 2001

미국 에너지부는 지난 2000년 4월 18일 연방 에너지 관리 프로그램의 일환으로 연방정부와 그 산하 기관들에 대한 에너지효율 개선 프로젝트에 대한 재정지원 방법을 규정한 초안을 마련했다. 이 초안은 그해 9월 15일 확정되어 현재 적용되고 있는 것으로 ESCO를 통한 ESPC방법과 설비회사를 통한 UESC방법을 소개하고 있다. 국내 ESCO사업의 발전에 도움이 되고자 그 전문을 3회에 걸쳐 원문과 함께 번역, 게재하기로 한다.

• Journal of Korean Neurosurgical Society
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• v.61 no.1
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• pp.10-18
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• 2018

Objective : To investigates the effect of curcumin on proliferation of spinal cord neural stem/progenitor cells (SC-NSPCs) and functional outcome in a rat spinal cord injury (SCI) model. Methods : Sixty adult male Sprague-Dawley rats were randomly and blindly allocated into three groups (sham control group; curcumin treated group after SCI; vehicle treated group after SCI). Functional recovery was evaluated by the Basso, Beattie, and Bresnahan (BBB) scale during 6 weeks after SCI. The expression of SC-NSPC proliferation and astrogliosis were analyzed by nestin/Bromodeoxyuridine (BrdU) and Glial fibrillary acidic protein (GFAP) staining. The injured spinal cord was then examined histologically, including quantification of cavitation. Results : The BBB score of the SCI-curcumin group was better than that of SCI-vehicle group up to 14 days (p<0.05). The coimmunoreactivity of nestin/BrdU in the SCI-curcumin group was much higher than that of the SCI-vehicle group 1 week after surgery (p<0.05). The GFAP immunoreactivity of the SCI-curcumin group was remarkably lower than that of the SCI-vehicle group 4 weeks after surgery (p<0.05). The lesion cavity was significantly reduced in the curcumin group as compared to the control group (p<0.05). Conclusion : These results indicate that curcumin could increase the expression of SC-NSPCs, and reduce the activity of reactive astrogliosis and lesion cavity. Consequently curcumin could improve the functional recovery after SCI via SC-NSPC properties.

• Journal of Drive and Control
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• v.12 no.3
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• pp.36-43
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• 2015

An autonomous vehicle control algorithm based on Ackerman Geometry is known to be reliable in low tire slip situation. However, vehicles at high speed make lateral errors due to high tire slip. In this paper, considering the tire slip of vehicles, the steering angle is determined based on the Ackerman Geometry and is supplemented tire slip angle by the Stanley steering algorithm. In addition, to prevent the tire slip, the algorithm, which restricts steering if a certain level of slip occurs, is used to reduce the lateral error. While many studies have been extended to include vehicle slip, studies also need to be carried out on the tire slip depending on hardware performance. The control algorithm of autonomous vehicles is compensated considering the sensor noise and the performance of steering actuator. Through the various simulations, it was found that the performance of steering actuator was the key factor affecting the performance of autonomous driving. Also, it was verified that the usefulness of steering algorithm considering the tire slip and performance of steering actuator.

• Journal of Advanced Navigation Technology
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• v.25 no.4
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• pp.267-272
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• 2021

The end of the ROK-U.S. missile guidelines opened up the possibility of developing space launch vehicles for various platforms based on air and sea. In particular, the air-based space launch vehicle is an essential space power projection capability compared to the ground-based space launch vehicle in consideration of the geographical location of the Korean Peninsula, such as the deployment of various satellite orbits and the timely launch of satellite. In addition, compared to the ground-based launch vehicle, the cost reduction effect is large, and it has the merit of energy gain because it can be launched with the advantage of the aircraft's altitude and speed. Therefore, in this paper, the necessity of air-based space launch vehicle in the strategic environment of the Korean Peninsula is clearly presented, and through technology trend analysis of various air launch vehicle, the three methods are proposed to have the most efficient air-based space launch vehicle capability in the Korean situation.

• Journal of Auto-vehicle Safety Association
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• v.7 no.1
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• pp.27-32
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• 2015

In order to protect occupant during car crash accident, Regulation and NCAP(New Car assessment Program) have been developed among various countries like U.S.A., Europe, Korea and Australia. Especially NCAP scores affect to sales of vehicles. So vehicle makers are trying to get good score in NCAP. Low leg injuries play an important role in Australia and Euro NCAP and these injuries are related with footrest design. Optimization of footrest design in early stage of vehicle development is necessary to obtain better and robust results of low legs during crash tests. In this paper, DFSS method and finite element model were used to optimize the low leg performance in small RHD vehicles. Compared with the lower leg injury of base model, the lower leg injury of proposed model was slightly improved and robustness was enhanced also.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.773-775
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• 2013

본 논문은 USN 융합기술을 활용하여 u-city 또는 u-bike 등과 같은 시스템을 구축함에 있어서, 필수 구성요소인 USN 기반 센서 네트워크 게이트웨이를 설계하고 구현한다. 따라서 게이트웨이는 관리 대상인 사물에 대한 상황 인지 기능을 수행하기 위하여 상황 인지 처리 하드웨어를 포함하는 게이트웨이 제어부(MPU)와 상황인지 처리 Sink-Node간의 상호 연동 기능, IP 코어망을 통한 센서망 관리 운용 시스템 연동 기능 등을 포함한다. 개발된 게이트웨이는 현재 자전거 공용 시스템에 적용하여 운용되고 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.11
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• pp.1309-1315
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• 2014

The switch for a maglev vehicle should be designed such that the vehicle safely changes its track without touching the guiderail. In particular, a medium-to-low-speed EMS -type maglev train relies heavily on a U-type electromagnet where it generates levitation force and guidance force simultaneously. Therefore, it is necessary to evaluate the safety of the vehicle whenever it passes the switch, as it lacks active control of the guidance force. Furthermore, when the vehicle passes a segmented switch, which is a group of curves made up of connected lines with a small radius of curvature, it may come into mechanical contact with the guiderail owing to the excessive lateral displacement of the electromagnet. The goal of this study is to analyze the influence of a segmented switch on the safety of major design-related variables for achieving improved running safety. We propose a three-dimensional multibody dynamics model composed of two cars with one body. Using the proposed model, we perform a simulation of the lateral air gap, which is one of the measurements of the running safety of the vehicle when it passes the switch. The analyzed design variables are the length between short span girder, the articulation angle, the length between two centers of a fixed girder at its ends, and the number of girders. On the basis of the effects of the considered design variables, we establish an optimized design of a switch with improved safety.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.365-368
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• 2005

The dynamic model was developed to analyze vibration acceleration and ride comfort during the operation of rubber-tired light rail vehicles. The ride comfort for standing passengers was analyzed in accordance with ISO 2631-1, UIC 513R, and CEN Draft prENV 12299 using this model. The result was applied to the detail design of Korean-standard, rubber-tired light rail vehicles, and the detail specifications related to ride comfort was determined based on this result. The ride comfort test was performed along the test track by using 2 car-train, and its result was compared with that of the ride comfort analysis, verifying the validity of the developed dynamic model. It was also verified whether or not the developed Korean-standardized, rubber-tired light rail vehicle met specified target specifications on ride comfort.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.832-836
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• 2004

This study was aimed to establish the acceptable contact force range between power collector and 3rd rail type conductor rail, and ramp slope for the Korean standardized rubber-tired AGT light rail vehicle. Dynamic behavior of the power collector, contact force variation and interruption in operation, were analyzed in the worst installation tolerance and various ramp slope of the conductor rail. The power collector was designed and manufactured to satisfy the Korean Standardized Specifications of the rubber-tired AGT light rail vehicle.