• Journal of the Korean Society for Railway
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• v.20 no.5
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• pp.612-624
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• 2017

As the existing metropolitan area metropolitan railway operates on a one-to-one basis, which leads to long travel times, its competitiveness with other means of transportation is deteriorating. Since there is a limit to attracting road traffic by rail, there is a continuing societal demand to expand express train service. Especially in the northern and the southwestern parts of the metropolitan area, a public transportation network system with express function, connecting to the city center of Seoul, is needed because of the social cost of the increase of traffic congestion and the increase of the travel time. The most efficient express service in Korea is Seoul Subway Line 9, which runs in 27 minutes from Gimpo Airport to the high speed terminal; this is a 40% shorter time compared to 44 minutes by car; the congestion in this area is up to 240%, so the preference for this train is quite high. The technical results of this study are expected to contribute to the implementation of an express service metropolitan railway.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.4
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• pp.243-250
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• 2001

This paper presents the structure of a $\mu$Spring package, its fabrication process and an analysis of its electrical characteristics compared to that of a $\mu$BGA. It was found that both $\mu$BGA and $\mu$Spring packages provide with outstanding high speed signal transmission characteristics due to their lower inductance of package interconnection lines, smaller than half of inductance of TSOP package lines. Even the worst case substrate trace of a Rambus DRAM $\mu$Spring package yields the line inductance of 2.9nH, which provides with 25% margin compared to the Rambus DRAM specification of 4nH. The fabrication cost of $\mu$Spring package is lower than that of $\mu$BGA by 50%, passes 1000 thermal cycles, meets JEDEC Level 1 specification whereas $\mu$BGA does not, and thereby yields high reliability and strong competing power.

• The Journal of Society for e-Business Studies
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• v.14 no.3
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• pp.153-168
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• 2009

Many companies and governments perform information technology (IT) projections repeatedly for higher competitiveness and efficiency. Moreover, as the sizes of IT projects increase, the manpower and cost estimation of the projects are getting more important. In this research, we present a size estimation method of information system development projects on the basis of the function point method at the stage of information strategy planning(ISP), and illustrate the size calculation of an example IT project. According to the method, we first identify the types of projects, the scope and boundaries of size estimation, then count data and transaction functions from the artifacts of the ISP project. The unadjusted function points are adjusted to function point by the table of the Early Function Point. The way of calculating the sizes of IT projects will support successful IT projects by estimating reasonable manpower and cost for the projects.

• Journal of the Korea Convergence Society
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• v.9 no.3
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• pp.181-186
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• 2018

Car-sharing services are one of the successful model of sharing economies. The car-sharing service is a kind of car rental service that can pay the cost per minutes, also can makes it easy to book and return by smart phone at any time. Experts predict that the car-sharing services will likely dominate the auto market in the future by reducing the burden on consumers' purchasing cost of car and resolving the environmental issues caused by the vehicle. Therefore, a differentiated service strategy is needed to establish a competitive caching service among these companies. In this study, we surveyed differentiation cases by comparing and analyzing domestic caching companies, And customized service tailored to the situation and effective vehicle type infotainment. As a result of this study, the proposed service method change, customized service provision, and new platform application are expected to be detailed and in depth.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.1B
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• pp.38-47
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• 2008

The system test was accomplished in delivery time for a suitable of various requirements at the software market. Especially, critical faults must be detected and removed for a close main functions and users against target system. In generally, proposed test methods are executed with a calendar time, not a competitive and effectiveness method as selective software testing. These methods are inapplicable to short term test or early system development stage. Moreover, it's accompanied by heavy cost. Overcoming of these problems, must attempted to new software test method role of core function in the system test. Selective software testing method is decided to mixing with the three-information such as a frequency, complexity of use scenario and fault impact. Using this information, searching a fatal error and usefully system test for an executed test scenario. In this paper, we have proposed new test method and verified testing results for the detection of critical faults or search a fatal errors with a system main function.

• The KIPS Transactions:PartD
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• v.14D no.5
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• pp.545-554
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• 2007

The user authentication and authorization in the current home network system almost works at home and home users, sometimes novice, should manage the system directly. This situation can make much of troubles, sometimes cause some suity problems. Moreover, the system costs high to build up, demands special user knowledge to maintain. In this paper, we propose the user authentication and authorization system based on remote management server to solve the problems, designed and implemented the system. To verify the system performance and function, we built a demo system for information appliances. The results of the test, the authentication and authorization function works well and reliably.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.477-477
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• 2012

미생물 연료전지는 정부가 추진하고 있는 신성장 동력사업의 녹색성장 정책에 부합하는 환경융합 신기술로써 일상생활에서 배출되는 하 폐수와 같은 유기물질을 전자공여체로 이용하여 전기에너지를 생산 할 수 있다는 점에서 각광받고 있다. 미생물 연료전지는 산화전극부의 미생물이 공급된 유기물질 을 분해하여 전자와 수소이온을 생성시키며 이들은 산소가 존재하는 환원전극부로 이동하여 물로 환원 됨 으로써 전기를 생성한다. 전기 화학적 성능의 향상을 위해 미생물 연료전지에서는 환원전극부에 서의 산소와 전자 및 수소이온의 빠른 환원반응을 유도해 주는 Pt촉매를 이용한다. 하지만 고가의 Pt 촉매는 미생물 연료전지의 현장적용을 위한 규모확장 시 초기비용이 증가되는 문제점을 초래한다. 이에 미생물 연료전지의 대체촉매 개발에 대한 많은 연구가 진행되고 있다. 화학적 연료전지에 관한 논문에서 연료전지의 촉매로 산소 환원반응에 높은 성능을 보이는 Co-N/C 형태의 Cobalt poly-pyrrole carbon가 제시 되었다. 이는 가격적인 측면에서는 Pt촉매의 약1/10배 정도 수준이지만 셀 성능은 Pt촉매의 95%정도의 효율을 보인다는 측면에서 향후 Pt 대체촉매로 가능성을 보여주는 새로운 비금속 촉매물질이다. Cobalt poly-pyrrole carbon이 Pt-catalsyt 셀 전압 성능 대비 약 66 %의 효율을 보였고 내부저항과 최대전력 밀도에 있어서도 촉매를 사용하지 않은 경우와 비금속 촉매의 성능보다 높음을 알 수 있었다. 본 연구는 Pt-catalsyt를 대체할 수 있는 저가의 산소환원 촉매물질 발굴을 위해 미생물연료전지에서 사용된 전례가 없으며 현재 화학전지의 촉매로 널리 쓰이고 있는 Cobalt poly-pyrrole carbon의 산소환원 촉매로써의 이용가능성을 평가하기 위해 실시되었으며, 평가한 결과는 첫 번째로 Cobalt poly-pyrrole carbon을 사용한 경우가 촉매를 사용하지 않은 경우와 비금속 촉매보다 환원 전극부에서의 원활한 환원작용이 진행되고 있음을 추측할 수 있으며 Pt-catalyst와 비교하였을 때 성능 대비 저렴한 가격으로 가격 경쟁력에 있어서 우월하다고 판단되었고 두 번째로 전기화학적 성능평가 및 EIS를 이용한 환원전극부의 내부저항 평가를 실시한 결과 셀 전압에 있어서 가장 많은 도말량 ($2.0mg/cm^2$)이 높은 성능을 보이고 있음을 알 수 있었다.

• Journal of Korean Society of Transportation
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• v.27 no.5
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• pp.75-82
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• 2009

Air transport markets are composed of airlines' networks through their base airports. The analysis of an air transport market has been focusing on determining the efficiency or competitiveness of airports or airlines in the market using number of routes, number of passengers, transfer rates, revenues, costs, and other data. However, little work has been done in analyzing the airport network itself. Assuming the air transport markets of Korea, China, and Japan are integrated, this paper aims to analyze the characteristics of the resulting airport network. To that end, the degree of connectivity, the degree of closeness, and the betweenness of centrality are employed. The analysis shows that Incheon International Airport is better than most other airports in terms of the degree of connectivity and that of closeness. Airports in Japan, however, exhibit strong connectivity but weak closeness and betweenness of centrality. Although it has low connectivity, Shenyang Airport has a possibility of becoming an attractive point of the integrated market in the future due to its high degree of closeness.

• Journal of Korea Society of Industrial Information Systems
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• v.25 no.2
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• pp.73-85
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• 2020

While Korea became one of manufacturing powers in the world through a fast-follower strategy as well as implementing the approach of advancing manufacturing business focused on quantitative input, The advent of the fourth industrial revolution and demand becoming more complicated than ever both require a system that quickly detects the change of markets in advance and reflects it in the manufacturing strategy. Accordingly, the introduction of a smart factory is not optional but mandatory in order to strengthen the competitiveness of manufacturing business using ICT. This paper aims to investigate key factors having influence on the intention to continuously use a smart factory, the innovative IT device, on the basis of the technology acceptance model. This paper analyzed the influence of the leadership of CEO, organizational learning and perceived switching costs on the intention to continuously use a smart factory by the parameters of perceived ease of use and usefulness, the major belief valuables of the IT acceptance model.

• The Journal of the Korea Contents Association
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• v.3 no.2
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• pp.87-95
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• 2003

Prompt and efficient information collection on each research area is emerging as the key factor of national technology competitiveness in industrialized society. Accordingly, constructing a variety of specialized DBs as the tool for supporting R&D activities and providing appropriate information are essential task to be solved in promoting R&D productivity. On this study, We have developed ceramics material property DB to support and facilitate R&D activities of industry, academia and research institutes. The ceramic property DB which was regarded as the most important DB surveyed from korean done for scientists and researchers was selected. To develop this DB, us have designed DB customized for domestic users after analyzing items and structures of ceramic material property information. We hope that R&D researchers can save time and cost in acquiring property information and the R&D productivity will be improved by utilizing our research result.