• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.152.1-152.1
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• 2011

This study analyzes transitions to a green path in transportation system in South Korea. We develop transportation system model with four new technology options, green cars; Hybrid electric vehicle, plug-in hybrid vehicle, electric vehicle and fuel cell vehicle. Among those technologies fuel cell vehicle is the best option assuming no GHG emissions when driving. We use MESSAGE model to get an optimal solution of pathway for high deployment of fuel cell vehicles under the Korea BAU transportation model. Among hydrogen production sources, off gas hydrogen is most economic since it is hardly used to other chemical sources or emits in South Korea. According to off gas hydrogen projection it can run 1.8 million fuel cell vehicles in 2040 which corresponds to 10% of all passenger cars expected in Korea in 2040. However, there are concerns associated with technology maturity, cost uncertainty which has contradictions. But clean pathway with off gas and renewable sources may provide a strong driving force for energy transition in transportation in South Korea.

• 한국산업융합학회 논문집
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• 제27권4_2호
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• pp.825-832
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• 2024

Traditional cars have a structure that steers the front wheels to change their direction so they have difficulties in performing parking motion, especially in a narrow space. As electric vehicles developed, robotics technology especially omni-directional mobile robot technology began to be incorporated into the automobile field. Omni-directional mobility and special turning movements are particularly useful for parking cars. In this paper, we propose a four-wheeled mobile robot. The proposed robot has a structure that can combine or separate robot body and robot wheel parts by using electric brakes. The proposed robot has omni-directional mobility and has the ability to rotate around an arbitrary point. Due to these omnidirectional and rotational characteristics, the proposed robot allows for various types of movements when applied to a car. In particular, parking is performed in a simple and intuitive manner that does not require complicated path planning. We implemented the proposed four-wheeled robot and showed its effectiveness by conducting several parking experiments.

• 한국정보통신학회논문지
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• 제22권12호
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• pp.1639-1644
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• 2018

전기자동차는 엔진 소음을 발생시키지 않는다. 엔진 소리가 없으면 보행자의 안전과 운전자의 주행 상태 인지에 문제를 가져온다. 이러한 문제를 피하기 위해 전기자동차 제조업체는 보통 샘플링 방식으로 엔진 소리를 녹음하여 재생하는 방식으로 엔진소리를 만들어 만든다. 그러나 샘플링 방식의 엔진 소리는 자연적인 엔진 소리를 만드는 것에 몇 가지 제한을 가진다. 이 문제를 극복하기 위해 우리는 소프트웨어 신디사이저를 이용하는 두 가지 방법을 연구했다. 그 둘은 감산형(subtractive)신디사이징과 웨이브테이블(wavetable) 신디사이징 방식으로 실제 엔진, 샘플링 방식, 감산형 방식과 비교한 결과 웨이브테이블 신디사이징 방식이 실제 엔진소리와 가장 유사함을 발견했다. 또한 데이터 사용과 제작비용에서 샘플링방식과 감산형 신디사이징 방식에 비해 유리함을 확인했다.

• 한국소음진동공학회논문집
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• 제18권3호
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• pp.335-344
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• 2008

In recent years, public complaints against railroad noise by KTX and Ordinary train have been rising. Regulation of railways noise uses same standard without distinguishing the type of railroad cars. According to the type of railroad cars, the frequency characteristics of emitting noise is different. Therefore it is requested to know how the public response vary to each types of railroad cars. The noise annoyance from three types of trains(KTX, electric train, diesel train) was analyzed by jury evaluation test for assessing the effect of frequency characteristics. The numerical results by a semantic differential method showed that annoyance response to three type of trains depended on the frequency characteristics. As a result, this study proposed that the KTX could have a bonus level of maximum 2.9 dB(A) compared to ordinary train.

• 반도체디스플레이기술학회지
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• 제15권4호
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• pp.61-66
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• 2016

This paper presents the implementation for a network structure of railway cars using a point to point communication. Most of network's representative specifications for a train are the FIP (Field Bus), MVB (Multifunction Vehicle Bus), CAN and WTB (Wire Train Bus) which is used by ALSOM, SIEMENS and BOMBADIER as major in this field. These networks in a physical layer use a multi-drop method, connected from $1^{st}$ car to $n^{th}$ car of a train through a cable without any extra services such as an electric part, amplifier. However waveforms which is passed through a long cable in the multi-drop are distorted by a capacitance or resistance of the cable or environments. Also since using a cable connected directly from $1^{st}$ car to $n^{th}$ car, if over two trains make double head, it isn't easy to distinguish ID for each railway cars. So by using the point to point network per each car, it is able to reduce a distortion. Also since reducing distortion, this communication speed can be been higher and transmit and receive any packets more stably. Using proposed token in a packet, this can make ID per each railway car automatically. Finally experimental results show the good performance and effectiveness of the proposed method.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.896-899
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• 2003

The electric railway has been widely used as a transportation all over the world. It also was opened in 1973 in korea and it has been steadily proceeded in making electric railway network for a big city and building Keongbu high speed , electric railway. That's why the system of electric railway is able to solve the environmental pollution and operate the useful energy in environmental ways, it helps to increase the ability of transportation and to decrease the cost. Because of the advantage of making the economic situation better, the system of electric railway is trying to do their best in developing technique of electric railway. Because of the increasing of transportation and the high speed operation, cars with regenerative braking system was adapted. Therefore, unbalanced voltage and current of three phase system and the drop and rise of voltage of feeding circuit is expected. Now that building the substation, newly spends lots of costs and time, it is a very difficult situation to solve the problem. We can guess that electric railway line can't receive power from the power system of bigger size in building newly electric railway. In this paper, it was proved that series voltage compensator was suitable as a solution according to voltage drop and voltage fluctuating through computer simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.947_948
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• 2009

In an attempt to minimize the air pollution caused by CO2, $NO_X$x, and $SO_X$ and the fuel cost, the auto industries and researchers recently are looking into replacing the diesel and gasoline cars with hybrid electric vehicles, plug-in electric vehicles, or battery powered electrical vehicles. This paper reports the technical status of the primary components such as batteries, motors, power control units and auxiliary parts to be used for electric vehicles.

• 마이크로전자및패키징학회지
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• 제26권4호
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• pp.1-6
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• 2019

Recently, as electric vehicles and hybrid vehicles are widely used, the use of rechargeable batteries is increasing. Electric and hybrid cars are made up of hundreds to thousands of electric cells depending on the car model. And the assembly process of the cells and modules requires a variety of bonding process. Meanwhile, in order to connect several cells in series, Cu used as a cathode and Al of an anode must be bonded. In this paper, the characteristics of Al and Cu metals, laser types, characteristics and principles of welding lasers for welding of Cu and Al electrodes are introduced.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.281-287
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• 2006

Subway line becomes an important way of transportation as road traffic goes to limit. Recently the large number of passengers of the subway lines near metropolitan area, In-Cheon, Su-Won, Pyung-Teak and Chon-An, is rapidly increasing. The electric cars of the No. 1 subway line in the suburbs are now running fast compared to the downtown area. However, the fast electric car can be uncomfortable to ride in, because there are so much noise and vibration. In this research, the running characteristics of the electric car of the No. 1 subway line in the suburbs is investigated through the measurements of the noise and vibration at running condition.

• 전기학회논문지
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• 제63권6호
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• pp.738-745
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• 2014

Recently, various measures have been discussed for overcoming depletion of fossil fuels and environmental pollution. One of the measures is electric vehicles. But electric vehicles has some limitations from high cost of battery and low efficiency, so operation distance of electric cars is limited. Also there are difficulties that charging lines should be connected by an electric car whenever it charges. Thus, many studies have been conducted to overcome the limitation using conventional batteries of electric vehicles. As a result, the OLEV(On-Line Electric Vehicle) was developed. But the OLEV system is some limitations. The OLEV system causes power quality problems when it charges. Power quality problem cannot be ignored because OLEV systems are closely connected by distribution grids. In this paper, the OLEV system is designed by using PSCAD/EMTDC, and the power quality is measured and evaluated. Power quality is divided by two cases; harmonics and high-frequency. Harmonics were evaluated according to IEEE Std. 519-1992. But the evaluation of High-frequency could not take it because there was no standard. For this reason, the data measured by OLEV system was compared with the EN50065 regulation.