• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.5D
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• pp.617-625
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• 2008

In low-density areas where travel pattern is widely dispersed and travel demand is relatively low, transit operators find it very difficult to provide a reasonable level of service at a reasonable cost. Timed-transfer system or network, if designed properly, can provide a reasonable level of service for passengers using transit systems serving low-density areas. The paper intends to apply a timed-transfer system for bus lines serving Yangsan City area and to assess the effects resulted from the application. The concept of a timed-transfer network/system is briefly described, and the present conditions of bus systems in Yangsan City area are discussed, focusing on the aspects of network type and the related problems. The bus timed-transfer network for the area is then developed by adjusting the existing routes and network with the consideration of travel time, route alignments, headways and transfer centers. One must note that developing a timed-transfer network presumes that network and schedule should be developed together. The effects of the developed time-transfer system on the passengers and operators are found substantially so as to justify its introduction to the City. The results of this study will be of considerable use for planners to design the transit systems in low density areas, where in general travel activities are widely dispersed and travel demands are low, so that provision of good quality of transit services are difficult.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.170-173
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• 2016

국내 항만공사는 항만공사법이 2003년 제정되고 부산항만공사가 2004년 설립된 이후 인천항만공사, 울산항만공사, 여수광양항만공사가 설립되어 운영되고 있다. 그러나 항만공사의 운영이 비효율적인 방향으로 흘러감에 따라 정부를 중심으로 공기업 통 폐합 등의 조직 개편 움직임의 목소리가 나오고 있다. 정부에서 구상하는 개편 방안 중 항만관리에 대해 통합적 운영이 적절한지, 분권적 운영이 바람직한지에 대해 보다 심층적인 논의가 필요하다. 본 연구는 항만공사 운영방식 개혁에 대한 논의에 대비하여 이러한 통합적인 접근방식과 분권적인 접근방식에 대한 비교분석을 하는 것을 그 목적으로 한다. 이를 위해 항만공사제도의 도입배경과 현황, 조직의 통합운영과 분산운영에 대한 이론적 배경, 국내 공기업 통합 사례 및 해외항만 운영 사례, 항만공사 운영 방식의 대안별 비교를 실시하였다. 이를 통해 다음과 같은 결론을 얻을 수 있었다. 첫째, 항만공사제도는 기존의 항만관리제도 개선을 위한 노력이라는 역사적 맥락을 기반으로 하여 기존 관리제도의 문제점을 개선하기 위한 대안으로 도입된 제도이며, 이러한 제도적 목적을 기반으로 항만공사 운영개선방안 논의가 되어야 한다는 것이다. 둘째, 공공기관 운영에 있어 내재되어 있는 문제점을 개선하기 위해 기관통합, 기능 조정, 부분통합 등 다양한 방식으로 개선이 가능하며 반드시 하나의 방법으로 이루어 질 수는 없다는 것이다. 셋째, 해외 주요 항만의 경우 개별 항만에 항만공사를 운영하는 개별적 운영방식을 택하고 있으며 대만이 유일하게 통합 운영하는 방식으로 개편하였으나 그 통합으로 인해 기대하는 효과가 실현되고 있지 않아 통합운영 방식의 근거가 되기는 어렵다. 넷째, 항만의 운영 자료를 분석한 결과 항만별로 처리하는 화물과 선대의 특성이 차이가 나고 운영방식과 대상이 되는 시장이 다름을 알 수 있었다. 이러한 항만별 운영과 고객의 차이를 감안하면 개별적 운영방식이 바람직하다고 판단된다. 결과적으로 통합 운영방식의 운영 효율성 개선 효과가 있을 수 있음에도 불구하고 항만공사제도의 목적과 취지를 감안할 때 현행 개별운영 방식을 유지하는 것이 바람직하다는 결론을 제시한다.

• Journal of Korean Society of Steel Construction
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• v.18 no.4
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• pp.481-490
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• 2006

The actual performance of a building during an earthquake depends on many factors. The prediction of the seismic performance of a new or existing structure is complex, due not only to the large number of factors that need to be considered and the complexity of the seismic response, but also due to the large inherent uncertainties and randomness associated with making these predictions. A central issue of this research is the proper treatment and incorporation of these uncertainties and randomness in the evaluation of structural capacity and response has been adopted in the seismic performance evaluation of steel tall buildings to account for the uncertainties and randomness in seismic demand and capacities in a consistent manner. The basic framework for reliability-based seismic performance evaluation and the key factors for statistical studies were summarized. A total of 36 target structures that represent typical tall steel buildings based on national building code (KBC-2005) were designed for the statistical studies of demand factor s and capacity factors. The incremental dynamic analysis (IDA) approach was examined through the simple steel moment frame building in determination of global drift capacity.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.5
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• pp.119-127
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• 2010

This paper provides a new approach for durability prediction of reinforced concrete structures exposed to carbonation. In this method, the prediction can be updated successively by a Bayes' theorem when additional data are available. The stochastic properties of model parameters are explicitly taken into account in the model. To simplify the procedure of the model, the probability of the durability limit is determined based on the samples obtained from the Latin Hypercube Sampling(LHS) technique. The new method may be very useful in design of important concrete structures and help to predict the remaining service life of existing concrete structures which have been monitored. For using the new method, in which the prior distribution is developed to represent the uncertainties of the carbonation velocity using data of concrete structures(3700 specimens) in Korea and the likelihood function is used to monitor in-situ data. The posterior distribution is obtained by combining a prior distribution and a likelihood function. Efficiency of the LHS technique for simulation was confirmed through a comparison between the LHS and the Monte Calro Simulation(MCS) technique.

• International Area Studies Review
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• v.13 no.2
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• pp.505-523
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• 2009

We study the cost of capital of Islamic enterprise using the Capital Asset Pricing Model(CAPM). When there exists no risk-free interest rate, the security market line(SML) of Islamic enterprise shows an upward slope starting from the origin. The slope is bigger than that of SML with risk-free interest rate. This is because the cost of capital of Islamic enterprise is higher than that of western firms for the same level of systematic risk. When the effect of zakat is considered, the risk-free interest rate is replaced by minimum required rate of return. The SML of Islamic enterprise reveals an upward slope but it does not pass through the origin. This is because Islamic enterprise cannot invest on risk-free asset. In order to overcome the theoretic limits of CAPM, we propose to use multi-factor approach such as arbitrage pricing model instead of single-factor model for future study.

• The Journal of Information Systems
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• v.30 no.4
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• pp.173-202
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• 2021

Purpose This study explored overall phenomena in context such as YouTube channel operation, strategy, and profit generation through interviews with two research participants who started their own businesses and are recognized as influencer on YouTube and analysis of viewer responses to uploaded contents. With the explosive growth of YouTube content provision and use, previous studies on YouTube are only being conducted individually on YouTube's content, influence, and content providers, so it is need to explore YouTube channel operations and the effect of revenue generation in context from an integrated perspective. Therefore, the purpose of this study is to present an integrated model that provides a specific process by contextually linking the factors and results influencing YouTube channel operation and revenue generation phenomena to individuals and companies who are trying to operate YouTube channels for the first time. Design/methodology/approach This study systematized and structured the overall phenomena in context such as YouTube channel operation, communication strategy, effect on revenue generation, and YouTube channel operation results by selecting interview subjects and collecting data through interviews, and analyzing viewer reactions (likes, comments, etc.). Due to the lack of previous studies exploring integrated phenomena, research analysis used Strauss & Corbin (1998)'s grounded theory approach, which presented inductive research methods to discover new theories by structuring concepts and categories based on detailed observations and information provided by interviewees. Findings The academic implication of this study is that while previous studies are conducted as individual studies on YouTube's content, influence, and content providers in the current situation where YouTube content provision and use are exploding, it integrally explores and presents an integrated model throughout the process. In addition, taking into account the lack of previous studies, it can be found in the aspect of using the grounded theory approach, an inductive theory approach that establishes a new theory. The practical implications can be found in that it presented practical directions to beginners who want to start operating YouTube channels by identifying operational preparations, communication strategies with viewers, and response management strategies.

• Journal of Gifted/Talented Education
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• v.18 no.3
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• pp.543-568
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• 2008

The study attempted to articulate standpoints towards compulsory education system based on schooling age and year in careful considerations with the gifted. For these ends, literatures were reviewed and various education laws, regulations and documents and related law reports and judicial decisions were investigated. Literature review was conducted to develop that ideas of rights to compulsory education for regular students are closely related to those for gifted. Structures of general education laws and gifted education law and regulations were compared. Later, limitations of compulsory education were discussed when it was applied for the gifted. In conclusions, it is inappropriate that the gifted are ruled by compulsory education system based on schooling age. If compulsory education system is designated to provide an effective opportunity for all students, it should be duties and rights to enter elementary schools at schooling age. However, it appeared that the duties and rights to enter elementary schools at certain schooling ages function as inhibitors against the gifted with giftedness and potentials far beyond those of regular students. Therefore, the gifted should be separately ruled under flexible systems of compulsory education if their achievement level is assessed as sufficient to enter elementary schools before schooling age. On the other hand, legal systems of compulsory education are gradually evolved to flexible systems. However, it is necessary to establish social atmosphere and support system of educational administration in order to practice the flexible system of compulsory education for the gifted.

• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.107-114
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• 2015

This study aimed to identify the impact of make-up education program on the level of satisfaction with make-up and the self-esteem of 80 elderly women. This education was provided during 8 weeks from May 28 to 16 July 2010 to women over 60 who were visiting P seniors welfare center, in D city. Some people fell out of the research, so finally the experimental group was 34 and the control group 36. During this research seven methods of make-up, including that of light make up were taught to the experimental group. Comparing the satisfaction and self-esteem levels before and after education. The result was that through the education the levels of their satisfaction with make-up and of their self-esteem were shown to have increased (p<0.05), significantly. We hope that through this research old people's healthy living and their social confidence can better converge.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.4
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• pp.319-326
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• 2015

Recently in the fields o f stochastic optimal control ( SOC) and reinforcemnet l earning (RL), there have been a great deal of research efforts for the problem of finding data-based sub-optimal control policies. The conventional theory for finding optimal controllers via the value-function-based dynamic programming was established for solving the stochastic optimal control problems with solid theoretical background. However, they can be successfully applied only to extremely simple cases. Hence, the data-based modern approach, which tries to find sub-optimal solutions utilizing relevant data such as the state-transition and reward signals instead of rigorous mathematical analyses, is particularly attractive to practical applications. In this paper, we consider a couple of methods combining the modern SOC strategies and approximate inference together with machine-learning-based data treatment methods. Also, we apply the resultant methods to a variety of application domains including financial engineering, and observe their performance.

• Journal of The Korean Association For Science Education
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• v.36 no.3
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• pp.371-387
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• 2016

Learning at the elbow of scientist is a well-known educational approach to improve students' understanding of science and scientific practice. This study, in the perspective of legitimate peripheral participation in a community of practice, explores how students' scientific practice and perception could be shifted through R&E program with the development of participation. Data from participant observation for 18 months and in-depth interviews were analyzed based on constant comparative method to extract common characteristics of students' participation and major shifts in their scientific practices and perceptions. Students' development of participation was categorized into three stages: legitimate, peripheral, and full participation. In the stage of peripheral participation, students perceived themselves as mere students and showed passive engagement. They just followed the directions of researchers and didn't know what they should be doing. But through continuous participation, students showed enhanced engagement like voluntary article reading, role assignments, and establishing norms in a community of practice with the reference of scientists'. In this stage of transitional participation, students also showed a deepened perception on everyday life of scientist and the community of scientist. And finally in the stage of full participation, students showed responsibility and ownership on research and continuous efforts to refine their research. They recognized themselves as beginning scientists. With these findings, this paper highlighted the dynamic processes of students' development of scientific practices and identity through R&E participation. It also suggests implications for research programs for education, especially for students who have already articulated a science-related career but still have only foggy notions about science.