• Journal of the Korean Society for Railway
• /
• v.9 no.4 s.35
• /
• pp.379-387
• /
• 2006

The objective of this study is to describe the influence of railway and railway station on the change of city structure in Korea in the early 20th century. In the 1900s, railway was constructed in Japanese concessions and in new pore cities such as Incheon, Busan, and Wonsan. In the 1920s, railroad construction became related with the cities, which could produce the corps. In the 1930s, railroad also became related to the colonial industrial cities. Traditional city structure was then completely changed because new city structure was focused on not Seoul but Japan or harbors towards Japan. So Korean cities, which were netted by railway, had become the subsystem of Japan in the early 20th century. Korean cities have developed on the basis of this system until 1945. For example, the twelve main cities were chosen through the relationship with Japanese life, and the provincial office governments moved near railroad stations. However nowadays, these cities have possibilities of being international cities, such as Incheon and Busan, because of the extroversion of these cities.

• Proceedings of the KIEE Conference
• /
• 2002.04a
• /
• pp.263-265
• /
• 2002

This paper presents a design method of database to manage materials having hierarchical structure on Kyungbu high-speed catenary system. Through this method, the automatic management software was developed. The software can get to find out assemblies as well as single fittings used in a section.

• Proceedings of the KSR Conference
• /
• 2004.10a
• /
• pp.1661-1664
• /
• 2004

This study is to examine the competitiveness of railroad freight transportation and build and activate railroad freight transportation strategy in terms of operation, such as logistics structure and manpower, and marketing strategy, that it could improve the efficiency of railroad freight transportation and maximize profitability.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.29 no.7
• /
• pp.566-569
• /
• 2018

A power line coupler that can apply high-frequency power to a railway overhead line structure was analyzed. It is difficult to supply auxiliary power to an overhead line in a high-voltage environment, and doing so requires a long-distance transfer. A method is proposed that utilizes the resonance on the Rogowski coil, which does not use a magnetic core. A simple overhead line structure was fabricated that consisted of a contact wire, messenger wire, and dropper. Couplers of various sizes were fabricated and deployed on the messenger wire, and the transfer characteristics of the two couplers were compared at a distance. As a result of applying the matching circuit to the coupler, the transmission efficiency was 53% at a distance of 2.5 m. The proposed method shows that it is possible to apply the auxiliary power by using the existing conductor in a special structure, such as the overhead line.

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.395-403
• /
• 2007

Railroad track consists of relatively simple structures such as rail, sleeper, ballast. Roadbed shares vertical pressure by train load which passed through rail to ballast as base that supports the track. For evaluating stress and displacement of roadbed due to the railroad load is an important role on the track as a basic data for estimation of the durability and design of the roadbed thickness. GEOTRACK program applied multi-layered theory was developed for analyzing railroad track structure. GEOTRACK program is a sort of numerical analysis program which has advantage that can analysis component of track by simple method. In this study, this program was used to preform the numerical analysis by changing track conditions and roadbed conditions such as tie, reinforced roadbed, dynamic wheel load, Resilient modulus and so on. Further detail will be presented on the paper.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.357-361
• /
• 1998

A new current controlled PWM technique for a 3-level inverter has been proposed and described in the paper. The proposed current control has the simple structure without needing to calculate the switching angles of the voltage vectors. The output in the proposed inverter contains less harmonic content than that of a conventional current controlled PWM controller, since the current control can be applied to the 3-level inverter. In addition, the proposed current controlled PWM technique has lower switching frequency than that of a conventional current controlled PWM technique at the same current limit. The control method and the performance for a proposed 3-level inverter has been discussed and investigated by the computer simulation.

• International Journal of Railway
• /
• v.6 no.2
• /
• pp.53-58
• /
• 2013

In this study, cyclic triaxial tests were carried out with the coarse granular materials used in Korean railway infrastructure (reinforced trackbed, gravel of transition zone, upper subgrade of railway) and Young's modulus for the target materials in small strain level were suggested. And the result of elastic modulus suggested in this study is expected to be effectively applied to dynamic analysis of the railway embankment structure using similar material, since the grain size distributions and unit weight of the material tested in this study are specified in Korean Railway Design Criteria.

• Proceedings of the KIEE Conference
• /
• 2001.04a
• /
• pp.433-435
• /
• 2001

Certification is the process of issuing a certificate to indicate conformance with a standard, a set of guidelines or some similar document. Any organization or individual may issue a certificate. In some cases a certificate may be required for legal reason. In such circumstance the certificate takes on the role of a licence from a statutory authority. In railway industry safety has always been the first concern. To achieve certification, specific safety management is required. In this paper, different types of safety management process through out the world are mentioned, and safety management structure appropriate to our circumstance is represented.

• Journal of the Korean Society of Systems Engineering
• /
• v.1 no.1
• /
• pp.26-31
• /
• 2005

In order to care about preserving the environment for future generations, each country has been required to make the laws of the environment. So manufacturers must design, manufacture and sell goods that meet customer's need and must do this while meeting the needs of the environment. In this research we have developed product structure and configuration management system that treats electronic catalogs for recycling of train parts. This research focused on two system. One is JAVA-based electronic catalog that give the information about recycling of train parts. The other is product structure and configuration management system based on electronic catalog and Bill of Materials(B.O.M).

• Proceedings of the KIEE Conference
• /
• 2001.07d
• /
• pp.2741-2743
• /
• 2001

The railway signaling systems are computerized vital equipments for safety guarantee of train running. And also it is important to prepare the reliable communication link between signalling equipments. In this paper the review of signalling communication protocol used at current railway signalling is presented and basic line for reliable protocol structure is represented. And also the direction for our further study on these is discussed.