• 한국대기환경학회지
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• 제23권3호
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• pp.311-321
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• 2007

Nowadays, concerns have much more growing regarding indoor air quality (IAQ) on the public transportation including railway vehicles. Last year Korea Ministry of Environment (ME) set new guideline for public transportation. In this study several factors were analyzed which may affect comfortableness of railway passenger cabin, and we monitored IAQ parameters (PM10, CO, $CO_2$, VOCs, temperature and humidity) to investigate the present pollution in passenger cabin. In general, the railway air quality was satisfactory. The PM10 and $CO_2$ level on all passenger cabin were below the new guideline level 1 for PM10 $(200{\mu}g/m^3)\;and\;CO_2(2,000ppm)$. Clustering method was carried out to classify the air polluting pattern of the cabin. As a result, the pollutants could be classified to 4 clusters and the origin of pollution is soil, diesel exhaust gas, abrasion of rail and plume.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.392-395
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• 2003

In the maritime container terminal, LMTT (Linear Motor-based Transfer Technology) is horizontal transfer system for the yard automation, which has been proposed to take the place of AGV (Automated Guided Vehicle). The system is based on PMLSM (Permanent Magnetic Linear Synchronous Motor) that is consists of stator modules on the rail and shuttle car (mover). Because of large variant of mover's weight by loading and unloading containers, the difference of each characteristic of stator modules, and a stator module's trouble etc., LMCPS (Linear Motor Conveyance Positioning System) is considered as that the system is changed its model suddenly and variously. In this paper, we will introduce the soft-computing method of a multi-step prediction control for LMCPS using DR-FNN (Dynamically-constructed Recurrent Fuzzy Neural Network). The proposed control system is used two networks for multi-step prediction. Consequently, the system has an ability to adapt for external disturbance, cogging force, force ripple, and sudden changes of itself.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2010년도 춘계학술대회
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• pp.165-166
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• 2010

오늘날 국제사회는 세계 곳곳에서 열어나고 있는 환경위기를 인식하여 국제환경협약과 선진국의 환경 규제를 강화하고 있다. 특히 항만도시들은 선박 및 화물자동차에서 배출되는 대기오염물질 등으로 항만의 높은 오염도에 많은 위협을 받고 있다. 이렇듯 세계적으로 환경 규제 논의가 활발한 지급 이미 선진국(미국, 일본, EU)에서는 친환경 항만정책 및 프로그램을 적극 투자하여 실현하고 있는 추세이다. 앞으로 더욱 엄격해질 환경규제(교토의정서, IMO협약 등) 속에서 저탄소 배출관리는 부산항의 미래 항만전략에서 경쟁력을 가지기 위해서 꼭 필요한 요소가 될 것으로 예상된다. 본 연구에서는 친환경정책에 앞장선 주요 선진국의 사례를 통해 항만과 배후 철송장과의 효율적인 연계방안에 대해 연구하는데 의의가 있다고 볼 수 있다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.307-310
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• 2003

In the maritime container terminal, LMTT(Linear Motor-based Transfer Technology) is horizontal transfer system for the yard automation, which has been proposed to take the place of AGV(Automated Guided Vehicle). The system is based on PMLSM (Permanent Magnetic Linear Synchronous Motor) that is consists of stator modules on the rail and shuttle car (mover). Because of large variant of mover's weight by loading and unloading containers, the difference of each characteristic of stator modules, and a stator module's trouble etc., LMCPS (Linear Motor Conveyance Positioning System) is considered as that the system is changed its model suddenly and variously. In this paper, we will introduce the soft-computing method of a multi-step prediction control for LMCPS using DR-FNN (Dynamically-constructed Recurrent Fuzzy Neural Network). The proposed control system is used two networks for multi-step prediction. Consequently, the system has an ability to adapt for external disturbance, cogging force, force ripple, and sudden changes of itself.

• 한국자동차공학회논문집
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• 제19권4호
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• pp.32-37
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• 2011

Biodiesel fuel is already remarkable alternative fuel in many countries. So, many studies are performed on the environmental or economic effects as well as the characteristics of diesel engine fueled biodiesel in combustion and emission. In this study, an CRDI diesel engine used to commercial vehicle was fueled with diesel fuel and 20% biodiesel blended fuel (BDF 20%) with city mode in excess of 300 hours. Engine dynamometer testing was completed at regularly scheduled intervals to monitor the engine performance and exhaust emissions. The engine performance and exhaust emissions were sampled at 1 hour interval for analysis. To check the engine parts (valve and injector), the engine was inspected after test. It was concluded that there were no unusual deteriorations of the engine, or any unusual changes in engine power and exhaust emissions in spite of operation of 300 hours with BDF 20%.

• 동력기계공학회지
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• 제17권6호
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• pp.149-155
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• 2013

Since bio-diesel oil has a merit that it satisfies both demand of substitution for fossil fuel and reduction in carbon dioxide emission, it is widely used in diesel engines by blending in gas oil in small quantity. It is needed to reduce in NOx emission in some way or others if blending ratio of bio-diesel oil is going to increase, because it is demerit that bio-diesel oil emits more NOx emission than gas oil. In this study, it was accomplished to optimize 3 factors what effect on NOx emission as blending ratio of bio-diesel oil, injection timing and common rail pressure with an introduction of a design of experiments, in order to minimize a number of tests. It was cleared that to introduce the design of experiments was very available in NOx optimization.

• 터널과지하공간
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• 제16권4호
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• pp.288-295
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• 2006

본 연구에서는 발파 및 지진발생으로 인한 횡방향 지반진동에 대하여 KTX 차량 및 부산지하철을 대상으로 주행안전성을 평가하였다. 이를 위하여 휠/레일 상호작용 해석 WERIA프로그램인 프로그램을 이용하여 철도차량의 동적거동을 시뮬레이션 하였다. 또한 횡방향 지반진동이 철도차량에 유발할 수 있는 차륜/레일간의 큰 상대변위를 고려하기 위하여 차륜/레일간 접촉면의 기하학적 형상과 크리프힘을 반영하였다. 입력하중은 국내의 내진규정 특성에 부합하는 인공지진과 공사중 발생하는 발파진동을 사용하였다. 해석 결과 차륜/레일간의 상대변위와 탈선계수를 산정하여 철도 차량의 주행안전성을 평가한 결과 탈선가능성은 없는 것으로 나타났다.

• 한국도로학회논문집
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• 제16권5호
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• pp.19-28
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• 2014

PURPOSES : This paper evaluates, using LS/DYNA-3D software, the vehicle impact performance of flexible barriers made of steel W-Beam supported by four different types of post configurations. These types include circular post, H-shape post, C-shape post, and square post. METHODS : The post-soil interaction has been investigated according to different impact angles. For this purpose, energy absorption, maximum displacements of post and rail, and occupant risk index of THIV have been compared each other. The three dimensional soil material model, instead of the conventional spring model based on Winkler and p-y curve, has been used to increase the correctness of computational model. RESULTS : It is noted the crash energy absorption has been increased with respect to the increase of impact angle. CONCLUSIONS : In particular, a post with open section(H-shape, C-shape) shows the greater crash energy absorption capability as compared with a post with closed section under the same level of impact conditions.

• 비파괴검사학회지
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• 제34권5호
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• pp.390-396
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• 2014

본 연구에서는 압전소자를 이용한 철도차량용 스마트 좌석 기술에 대한 적용성을 검토하였다. 이를 위해 스마트 좌석 기술에 대한 개념을 정립하였고, 실제 철도차량용 좌석을 단순화한 축소 모형을 제작하여 압전소자를 적용한 후 스마트 좌석의 기능에 대한 시뮬레이션 시험을 수행하였다. 시험을 통해, 본 연구에서 제안한 실시간 착석 확인 및 도착알림기능이 포함된 압전소자기반 스마트 좌석 시스템의 실현 가능성을 검증하였다. 본 연구 결과는 향후 실용화를 통해 검토 업무 효율화를 통한 고소철도 서비스의 질적 향상에 기여할 수 있을 것이다.

• 한국안전학회지
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• 제30권5호
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• pp.92-99
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• 2015

The diameter of a new wheel in EMUs is 860mm and it can be used up to 773mm. To obtain an predefined acceleration despite wheel diameter changes, the tractive efforts of the vehicles must be properly controlled. In the commencement of this study, acceleration tests were performed for empty EMUs when the wheel diameter was changed to 860mm, 820mm and 780mm, respectively. In order to deal with more complicated running conditions, we developed dynamic simulation models of the EMUs using VI-Rail, and simulated the models in empty and full passenger loads, respectively. Using the simulation results, we analyzed the gradient of time-velocity graphs by considering the changes of the total weight vehicles and moment of inertia of the wheelsets as well as tractive effort according to the wheel diameter changes. As the results, it was found that there are significant differences in acceleration performances according to the wheel diameters and the payloads of EMUs. In case of 860mm which is the maximum wheel diameter, the test & simulation results show that the vehicle couldn't reach the predefined acceleration, 3.0km/h/s, due to lack of tractive effort.