• 실내환경 및 냄새 학회지
• /
• 제17권4호
• /
• pp.303-314
• /
• 2018

The urban railway system is a convenient public transportation system, as it carries many people without increasing traffic congestion. However, air quality in urban railway environments is worse than ambient air quality due to the internal location of the source of air pollutants and the isolated space. In this paper, characteristics of particulate matter (PM) pollution in urban railway environments are described from the perspective of diurnal variation, chemical composition and source apportionment of PM. PM concentrations in concourse, platform, passenger cabin, and tunnel are summarized through an analysis of 34 journal articles published in Korea and overseas. This information will be helpful in developing effective policies to reduce PM pollution in urban railway environments.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 추계학술대회 논문집
• /
• pp.140-145
• /
• 2005

The dynamic performances of railway vehicles, such as ride comfort, stability and safety, have the opposite characteristics of response each other according to design changes of suspensions. For this reasons, it is necessary that multidisciplinary engineers join in design processes of the suspensions so as to satisfy the requirements of dynamic performance with design constraints. Sometimes iterative dynamic analyses are required so many times during the design processes. In this paper, the development of integrated process environments and the dynamic analyses of railway vehicles based on the environments are presented. Using agent and wrapping technologies, process managements about the work process and design parameters were set up under the distributed computing environments. Also, dynamic analyses on the sample railway vehicle were carried out and the efficiency and improvement in future work were discussed as results.

• 한국철도학회논문집
• /
• 제4권2호
• /
• pp.62-70
• /
• 2001

Pure copper, Cu-1.1wt%Cd and ACSR(Aluminum Conductor Steel Reinforced) have been used as catenary materials of the electric railway system. Since these materials may be exposed to the corrosive environments like polluted air, acid rain and sea water, it is important to investigate the corrosion rates in various corrosive environments. The aqueous corrosion characteristics of catenary materials in aerated acid, neutral and alkali solutions were studied by using immersion corrosion tests, electrochemical measurements and analytical techniques. In order to examine corrosion characteristics according to the dissolved oxygen content, pH, chloride ion concentration ion, and the addition of Cd to Cu, a series of tests such as potentiodynamic polarization, a.c impedance spectroscopy and galvanic corrosion tests were carried out with these materials. Results showed that the addition of Cd to Cu and chloride ion in the solution have an adverse effects on the resistance to corrosion. Additionally, Galvanic currents between Al and steel wires of ACSR were confirmed by using ZRA(zero resistance ammeter) method.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 추계학술대회 논문집
• /
• pp.1444-1448
• /
• 2004

The railway electromagnetic environment is much more severe than that found in commercial and domestic environments. However, in many instances the railway runs very close to such environments. Tn this paper we measure the strength of electromagnetic fields for Korean High Speed Train Prototype and compare that with the past result and evaluate the result according to domestic and international guideline.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 추계학술대회 논문집
• /
• pp.59-64
• /
• 2005

The railway electrical environment is much more severe than that found in commercial and domestic environments. However, in many instances the railway runs very close to such environments. In this paper we measure the harmonic, the strength of electromagnetic fields and the consumption energy for Korean High Speed Train and compare that with the past result and evaluate the result according to domestic and international guideline.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
• /
• pp.1915-1916
• /
• 2006

Recently, for positioning a train and synchronizing between equipments in railway environment, the utilization of GPS(Global Positioning System) is increasing. But, the defects of GPS are pointed out. The risk of dependence on only GPS is not neglectable. Therefore, we prepare the implementation of the future railway system through the research on the safety and reliability of applying GPS to railway system.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 1999년도 춘계학술대회 논문집
• /
• pp.358-364
• /
• 1999

A wheel/rail contact module for dynamics analysis of railway vehicles is developed. The developed module is based on non-linear contact and FASTSIM algorithm which calculates contact forces. And the module is incorporated into the general purpose program DADS using user-defined subroutines. The simulation results of this developed program is compared to those of the railway vehicle dynamics analysis program AGEM. Since the module is based on DADS, various simulation environments can be considered.

• 한국전자통신학회논문지
• /
• 제15권3호
• /
• pp.473-478
• /
• 2020

열차 운행의 정확성과 안정성을 위하여 열차와 열차이동 주변환경 사이의 통신은 필수적인 요소이다. 열차 운행을 지원하기 위해서는 열차와 열차이동 주변 환경 사이에 측정/감시 등을 목적으로 사용되는 센서와 열차 간의 통신 구조와 성능의 분석이 요구된다. 본 논문에서는 이동 중에 있는 열차가 열차궤도 주변에 있는 각종 센서장치로부터 측정된 열차운행 및 환경 정보를 효과적으로 수신하고 이를 열차 데이터 관제 센터로 전송하는 LTE-R 기반의 철도 센서네트워크에 대한 성능을 분석하고 철도 센서 네트워크 구축에 필요한 구축 조건을 제시한다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 춘계학술대회 논문집
• /
• pp.873-876
• /
• 2005

The railway electromagnetic environment is much more severe than that found in commercial and domestic environments. However. in many instances the railway runs very close to such environments. In this paper we measure the harmonic and the strength of electromagnetic fields for Korean High Speed Train and compare that with the past result and evaluate the result according to domestic and international guideline.

• 한국전자통신학회논문지
• /
• 제12권1호
• /
• pp.69-74
• /
• 2017

중계기는 송신기에서 수신기로 신호를 전송할 때 통신반경을 확장시키고 음영지역을 제거시키는 장점 때문에 다양한 무선통신 시스템에서 적용이 가능하다. 본 논문에서는 철도환경에서 중계기를 사용하는 듀얼홉 통신시스템을 적용하여 하향링크에서의 성능을 분석한다. 통신방식은 기지국에서 중계기사이에서는 동기변조방식을 사용하고 중계기에서 수신기 사이에서는 차등변조방식을 사용하는 비대칭 전송방식을 적용한다. 시스템의 성능은 심벌오류율을 이용하며 분석하며 전체시스템이 동기방식을 이용하는 시스템과의 성능을 비교한다. 중계기 거리 및 에너지할당에 따른 성능 또한 분석한다.