• Journal of the Korean Society for Railway
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• v.17 no.4
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• pp.297-306
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• 2014

This paper analyzes Japan's consignment management of the Chosun Railway to the South Manchuria Railway. While Chosun Railway was entrusted, its management style differed significantly from that of Japan's direct management. After eight years of trust management, the direct management of Chosun Railway was returned to Japan. This of beyond border trust management is very rare. In addition, the management of Chosun Railway by South Manchuria Railway, which had an operation style similar to that of a private company, led to changes in Chosun Railway. This research analyzes the four key traits of South Manchuria Railway's consigned management. The first key trait is the initial Korean infrastructure and operation separation model. The second key trait is the international transportation and administration segregation. The third key trait is that it expanded the railway related businesses and led to the establishment of private railway companies. The fourth key trait is that the continental linked transportation was activated. Through analyses, it would be to create a comparative study of the resulting East Asian countries' operations. Furthermore, this research will in investigating the nature of Chosun Railway.

• Journal of the Korean Society for Railway
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• v.18 no.5
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• pp.489-501
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• 2015

This paper analyses the decision process of the Gilhoe Line construction of the Manchurian Railway and consignment process of the North Korea Line to the South Manchuria Railways as part of the 12-year Chosun railway plan. It was found that these two events were connected and could be explained by Japan's consistent continental policy, which had expanded its territory toward China. This paper explicates Japan's railroad policy and the characteristics of the Chosun railway. Moreover, evidence to identify connections among Japan's national railway, the Manchurian railway, and the Chosun railway has been scrutinized. One territory policy between Chosun and Manchuria is also examined. Comparison of new resources on the Gilhoe Line construction of the Manchurian railway and the 12-year plan of the Chosun railway, and their correlations, is expounded. This paper elucidates that the Gilhoe Line construction and the North Korea line consignment operation by the South Manchuria Railways had the intention of obtaining Japanese military and economic supremacy over East Asia.

• Journal of the Korean Society for Railway
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• v.19 no.2
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• pp.251-261
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• 2016

In this paper, changes of railway-related organization during the Japanese colonial period were studied indepth. The railway-related organizations were expanded from the Railway Management Bureau in 1906 (Residency-General). In 1910, this bureau changed to the General of Chosun Railway Bureau (Government-General) and the Chosun Railway Bureau (Government-General). In the 1940's, it developed into an organization called the Transport Bureau, dealing with the whole transport service. The number of employees in the railway sector increased along with the expansion of the organization and the establishment of a training institution for better recruitment. After examining the period of the construction of railway and connection system, which is deeply related to the railway organizations of the Japanese colonial period, this paper analyzes the transformation process of railway-related laws and organizations. Furthermore, this paper finds common characteristics and differences between railways in a comparison of three countries: Chosun, Japan and Taiwan.

• Journal of the Korean Society for Railway
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• v.20 no.3
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• pp.423-431
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• 2017

This study analyzed the educational background, career, and post-retirement activities of notable bureaucrats employed at Chosun Railway Bureau during the Japanese colonial period in Korea. First, significantly, most railway bureaucrats were of Japanese origin, being specialized in railway operations and adjusted to occupation in a reserved organizational environment for a considerable time period. Second, the Japanese showed explicit eagerness to work at the Chosun Railway, which fitted their ideology of railway bureaucrats. In addition, almost 60% of the bureaucrat population had strong educational experience from Tokyo Imperial University, which is equal to the percentage of graduates from other institutions operating during the Japanese colonial period. Moreover, in the very early period of building the railway system, the demand for specialists was higher than for other jobs and divisions because of the railroad's complex infrastructure, which resulted in high job appointment rates. In a similar sense, based on a strong affiliation of bureaucrats with railways, the number of bureaucrats from Japanese Railway Worker's Bureau was higher initially because of bureaucrats from South Manchurian Railway Company. These changes essentially contributed to alteration of bureaucrats' awareness and created a more positive attitude regarding the Chosun Railway. In the meantime, as opposed to the Taiwan and Manchurian Railways, both Chosun Railway and the Taiwan Railway were operated in compliance with strong bureaucratic traditions.

• Journal of the Korean Society for Railway
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• v.20 no.1
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• pp.128-141
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• 2017

This paper analyzes the under-researched field of the characteristics of th Chosun private railway, such as laws, systems, human resources, and subsidies associated with this railway, in an effort to increase our understanding of these characteristics. It was found that the private railway shared strong identity resemblance with a national project, as it served to assist the roles of the main national railway. General patterns of change of the company indicate that the private railway received increased subsidies consequent to the amendment of a related law and that it was strongly influenced by Japan's railway policies. The private railway system during the Chosun period more subsidies than those administered by Japan, and they tended to depend on fund raising for external capital. A tendency of many board members to be from the Chosun bureau was also noted. Profits in the private railway system were relatively low compared to those of the national railway such that the deficits were supplemented by the subsidies redeived. Based on corroborating examples, the private railway system can be said to have been an organization that had strong connections with national projects. It was especially related to regional industries according to an examination of the distribution of lines, which shows that most assisted the main railway or coincided with regions undergoing industrial development. Typically, northern areas were for resource development while southern areas were for agricultural production and/or passenger transportation. The company carried dual traits as it operated as a subsidiary enterprise for peripheral profit while also playing a role in transportation.

• Journal of Advanced Engineering and Technology
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• v.10 no.2
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• pp.203-208
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• 2017

Due to global climate change issues, there is a growing demand for systems throughout the industry. In the case of power conversion, studies have been actively conducted to change the structure of the power conversion circuit and to apply new power devices. In particular, the WBG (Wide Band Gap), which is newly emerged device in the market for developing semiconductor technology, has demonstrated advantages in applying for various aspects in comparison to the existing Si (Silicon) Semiconductor. Recent research centers in the railway industry are focusing on developing technologies suitable for railway vehicles by utilizing these new developments in railway countries such as Japan and Europe. This paper researches the WBG device that is applicable to the auxiliary power supplies (APS) in railway system, and analyzes the downsizing effects to APS in high-speed railway by conducting a theoretical analysis and simulation.

• International Journal of Railway
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• v.6 no.3
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• pp.90-94
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• 2013

Cement or lime is generally used to improve the strength of soil. However, bacteria were utilized to produce cementation of loose soils in this study. The microo rganism called Bacillus, and $CaCl_2$ was introduced into loose sand and soft silt and $CaCO_3$ in the voids of soil particles were produced, leading to cementation of soil particles. In this study, loose sand and soft silt typically encountered in Korea were bio-treated with 3 types of bacteria concentration. The cementation (or calcite precipitation) in the soil particles induced by the high concentration bacteria treatment was investigated at 7 days after curing. Based on the results of Scanning Electron Microscope (SEM) tests and EDX analyses, high concentration bacteria treatment for loose sand was observed to produce noticeable amount of $CaCO_3$, implying a significant cementation of soil particles. It was observed that higher calcium carbonate depositions were observed in poorly graded distribution as compared to well graded distribution. In addition, effectiveness of biogrouting has also been found to be feasible by bio-treatment without any cementing agent.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.1
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• pp.171-175
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• 2015

In this paper, because of global environmental problems such as energy shortage and abnormal climate, green energy development and energy saving technology development is being magnified. Heat insulation, the most basic and traditional energy saving method, is highly expected. Especially, simple and advanced heat insulation technique based on Nano material is promising future technology. The railway system also requires heat insulation. Especially, traditional heat insulator such as glass wool has been adopted frequently to rolling stock. The heat insulator is also adopted in general railway service buildings. Take account of cost-effective heat blocking performance, the heat insulator shall be adopted in diverse fields such as electric power, railroad, signal and communication. The only and direct solution for this problem is installing heat insulator with outstanding endurance, corrosion resistance and heat resistance to block outer heat Upgrading heat specification of equipment can be a solution, but since price and maintenance cost rise severely, this plan might be incongruous. In this research, energy saving effect of ultrathin heat insulator film was demonstrated by installing the film on roof of electrical room.

• Journal of architectural history
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• v.28 no.6
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• pp.55-65
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• 2019

Ganggyeong, a city which is located at riverside of Geum River, played a role to connect the inland cities and the coastal cities through the Geum river waterway. In Chosun dynasty, Ganggyeong was one of the three major markets in Korea, and at the same time, it was one of the two river docks in Korea. However, after the railway was installed in Korea, railroad was more important than waterway in transporting logistics and in 1911 Honam railroad and Ganggyeong railway station was installed. Thus it was necessary to reorganize urban structure of Ganggyeong city from the traditional river-dock city to modern railroad city. In addition, urban infrastructure to prevent flood damage was needed because Ganggyeong suffered from floods and water shortages every year. Therefore, between 1910s and 1930s large-scale social infrastructures including road, water and sewage system, river bank, floodgate was constructed not only to revitalize the declining city but also to prevent flood damage and water shortages that hinder urban development. The installation of urban infrastructure has enabled the urban expansion and development of Ganggyeong city, and it is still served as a basic urban structure.

• Journal of the Korean Geosynthetics Society
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• v.14 no.1
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• pp.59-65
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• 2015

The objective of the study is to verify a new calibration equation of dry density and water contents with TDR. Since the traditional calibration equation was proposed, some research to develop a new calibration equation has been conducted by several researchers. As traditional calibration equation is difficult to be applied for loose soil and fine-grained soil at high water contents, this study developed a new calibration equation. Thus, this study introduces a new calibration equation and its applicability by comparing TDR test results with conventional test results. Based on the analyses, the calibration equation for water content has large error. A new calibration equation was proposed and it showed more than 95% accuracy for estimating water content of soil.