• Journal of odor and indoor environment
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• v.17 no.4
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• pp.303-314
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• 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.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.140-145
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• 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.

• Journal of the Korean Society for Railway
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• v.4 no.2
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• pp.62-70
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• 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.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1444-1448
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• 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.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.59-64
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• 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.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1915-1916
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• 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.

• Proceedings of the KSR Conference
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• 1999.05a
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• pp.358-364
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• 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.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.3
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• pp.473-478
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• 2020

The communication between train and it's moving environments is considered as a necessity factor to support accuracy and safety for operation of train. Communication structure and performance between sensor and train used to measure and monitor between train and it's moving environments is required in operation of the train. In this paper, railway sensor network based on LTE-R is described and analyzed for moving train to support effective measure operation and environment data from various sensor devices located through railway and then transfer the data to data control center. Finally, implementation requirement for railway sensor network is suggested.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.873-876
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• 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.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.1
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• pp.69-74
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• 2017

Due to the advantage of communication coverage extension and removement of shadowing area, relay can be applied in various wireless communication systems. In this paper, we analyze performance of downlink with dual-hop communication systems which use a relay in railway environments. We adopted asymmetric communication system which use coherent modulation scheme in base station-relay link and differential modulation scheme in relay-destination link. The performance of communication system is analyzed using symbol error rate, and performance comparison with the systems which adopts fully coherent scheme is studied. We also investigate the performance of system depending on relay distance and energy allocation.