• Journal of the Korean Society for information Management
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• v.20 no.2
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• pp.177-198
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• 2003

The most significant part of this study is in developing an experimental medel of user-friendly PDL. This study proposes both theoretical (conceptual) and physical (operational) models. The theoretical model includes the analysis on various factors and the realtionsips among factors which have a serious impacts on the design, building, and managing of PDL. And the physical model shows the shows the detailed structure and process which could be useful for both PDL designers and managers. Also provided is the images of major user interfaces, of which a PDL would be developed on the basis of the proposed medel in near future.

• The Journal of Natural Sciences
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• v.10 no.1
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• pp.1-7
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• 1998

A Lennard-Jones fluid layer adsorbed on a smooth solid surface was studied at coverages $\theta$ ~ 0.8 to 1.8 on an isotherm by performing intensive grand canonical Monte Carlo simulations. The results clearly show a picture of two-step melting process which used to be observed in recent thermodynamic measurements of argon monolayer melting on graphite. The observed melting process consist of an abrupt density change followed by a gradual transition. Snapshots of monolayer configurations indicate that the creation and dissociation of a dislocation pair are involved in the melting mechanism. Taking the effect of system size into account, it is suggested that, while the abrupt density change may be not related to the theory of Kosterlitz, Thouless, Halperin, Nelson, and Young (KTHNY), the second gradual transition is probably a KTHNY-type melting transition.

• Journal of the Korean Society for Library and Information Science
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• v.49 no.4
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• pp.317-334
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• 2015

This study aims to investigate information seeking behavior of mobile-based Web users, especially, college students. This study also evaluates mobile search services based on various criteria, and suggests how to improve portal's mobile search services. The results of this study show that the most urgent improvement is needed in the contents of mobile search services. Improvements are also required in the area of interface design followed by accessibility and mobile search functionalities. The results of this study can be applied to the portal's effective development of mobile search services.

• Journal of the Korean Society for Railway
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• v.11 no.6
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• pp.588-595
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• 2008

This study is carried out for understanding mode choice behavior of shippers and introducing ideal mode share between rail and truck in Korea. The model type is individual behavioral model and the input data type is stated preference (SP) data. SP data was prepared by design of experiments. The explanatory variables in models are transport time, transport cost and service level. The research result shows that it is more effective to reduce transport cost rather than to implement other strategies. For container, reducing transport cost and transport time and increasing service level simultaneously can strengthen the competitiveness of rail over truck transportation. On the other hand, for bulk freight such as cement and steel, it is better to reduce the transport cost than to do other attributes.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.22 no.2
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• pp.81-100
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• 2011

This research used content analysis to examine the research trends of two core journals from 2000 to 2009 in education. The analysis measured research subjects, research methods, research behaviors, numbers of author and co-authors' affiliations, and research funds. The results showed that research articles in educational administration and higher education have increased constantly, whereas research articles in other fields have decreased. Experimental research method was shown to be used widely along with documentary research and survey research method. Most researches were done by one author and each of them were affiliated to universities or research institutions. The research suggested practical educational research, comparative research on international issues and indexes, methodological elaboration, and use of various units of analysis for future studies.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.5
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• pp.43-52
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• 2023

Traffic accidents among children have been decreasing after the installation of yellow carpets. However, the explanatory power of the causal relationship between yellow carpet installation and traffic accidents is still insufficient. The yellow carpet effect was analyzed in greater depth using virtual reality (VR) simulation experiments in various situation that could not be evaluated in existing actual vehicle research studies due to difficulties or risks in implementation. A target site where an actual yellow carpet was installed was selected and, implemented into a virtual environment. Subjects were made to, were gaze measurement equipment and ride the simulator. The visual/driving behavior before and after yellow carpet installation was compared, and a t-test analysis was performed for statistical verification. All the results were found to be statistically significant.

• Archives of design research
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• v.19 no.1 s.63
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• pp.317-328
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• 2006

So far, the behaviors of Web users have been predicted or analyzed mostly by their demographic characteristics or by considering in which context they gain access to that. But now there is a question about whether those characteristics are the only factors to trigger their use of Web. If the answer is not affirmative, what types of additional factors could cause such an action and how they characterize it should be discussed. User profile information has been considered one of the crucial elements to define user characteristics in user-centered UI design sector, and in order to apply it to UI design, it's needed to meditate on the above-mentioned questions. In this study, it's first attempted to have a good understanding of the users of different media and to review existing user classification methods. Next, user classification variables and relevant scales were prepared to sort out users according to their type of using Web, and case study was conducted to identify the behavioral characteristics of users and classify them according to their behavioral features. Finally, the user profile features of individual user groups were figured out based on data that were gathered by making an experiment, and data mapping was fulfilled between the behavioral characteristics and user profile characteristics to find out what types of behaviors were caused by the characteristics of user profile. As a result, it's found that user characteristics could have an impact on not only their general information and relevant contexts but their attitude of using different media and personality type. There were some problems with the experimental design, but more accurate information on the relationship of user behaviors to user profile characteristics will be obtained if those problems are eliminated. As user behaviors could be predicted only by user profile characteristics, user classification is expected to make a contribution to enhancing the efficiency of UI design.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.1999-2007
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• 2013

The key characteristics of two-lane-and-two-way traffic flow are platoon and overtaking caused by low-speed vehicle such as truck. In order to develop two-way traffic flow model comprised of CF(car-following) and overtaking model, it is essential to develop a car-following model which is suitable to two-way traffic flow. Short distance between vehicles is caused when a high-speed vehicle tailgates and overtakes foregoing low-speed vehicle on two-way road system. And a vehicle following low-speed vehicle decides to overtake the front low-speed vehicle using suitable space within the headway distribution of opposite traffic flow. For this reason, a two-way CF model should describes not only running within short gap but also headway distribution. Additionally considering domestic two-way-road size, there is a on-going need for large-network simulation, but there are few studies for two-way CF model. In this paper, a two-way CA model is developed, which explains two-way CF behavior more realistic and can be applied for large road network. The experimental results show that the developed model mimics stop-and-go phenomenon, one of features of congested traffic flow, and efficiently generates the distribution of headway. When the CF model is integrated with overtaking model, it is, therefore, expected that two-way traffic flow can be explained more realistically than before.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.526-529
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• 2010

국내에서는 철도차량의 화재안전성능을 향상시키기 위해 성능평가를 적용하기 위한 연구가 진행되고 있다. 철도차량에서의 화재 시 피난은 여러 가지 시나리오들이 존재하며, 이중 하나가 터널내부에서 정전이 되어 무조명상태가 되는 것이다. 철도차량은 물리적 공간적 환경이 건축물과 차이가 있다. 또한 문화적 인종적 차이로 인해 외국의 데이터를 바로 적용하는 것도 바람직한 일은 아니다. 그러므로 시나리오를 분석하기 위해 필요한 데이터는 실험을 통해 확보해야할 필요성이 있는 것이다. 무조명 상태에서의 피난인의 행태와 이동속도의 차이 등을 분석하기 위해 실험을 수행하고 그 결과를 분석해 보았다.

• Korean Journal of Legislative Studies
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• v.17 no.3
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• pp.117-143
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• 2011

이 연구는 선거에서 후보자들의 정책 입장(issue stance)을 유권자들이 어떻게 판단하고 인식하는 지 살펴본다. 기존의 연구들은 후보자들의 정책에 대한 유권자들의 인식을 설명하는 데서 캠페인 정보(campaign information)의 직접적인 영향을 제대로 고려하지 않았다. 이 논문은 후보자 정책 입장에 대한 캠페인 정보가 과연 유권자들의 인식에 직접적인 영향을 미치는 지 미국에서 이루어진 실험 데이터를 이용하여 분석한다. 아울러 투영 효과(projection effect)나 허구적 일치성 효과(false consensus effect) 등 기존의 연구에서 제시된 설명들이 이러한 캠페인 정보의 영향을 감안했을 경우에도 여전히 유효한 지 살펴본다. 실험 데이터의 분석 결과는 캠페인 정보가 후보자 정책에 대한 유권자들의 판단에 직접적인 영향을 미치며, 이러한 캠페인 정보의 영향을 감안했을 때 투영 효과는 여전히 유효한 반면 허구적 일치성 효과는 상대적으로 약하게 나타난다는 것을 보여준다.