• Asia pacific journal of information systems
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• v.10 no.3
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• pp.17-40
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• 2000

This study aims at proposing a direction of improving the efficiency in Korean information technology(IT) industry. In the face of re-engineering which has been done in most industries, it is very important to assess the validity of their restructuring or M&A based on the future efficiency. At first, by using the DEA/WINDOW, we will evaluate how the 30 firms are efficient for outputting their performance with respect to the profit realization and market ability. Then, in order to propose the direction of the efficiency improvement and suitable restructuring strategy, we will clarify how the efficiency of IT firms depends on their firm size. Finally, we will analyze their 'economy of scale' and also reveal how their economy of scale depends on the firm size based on return-to-scale(RTS).

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2001.01a
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• pp.364-369
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• 2001

As the population of persons over the age of sixty-five is rapidly growing, the population of solitary senior person living at own home is growing in Japan. This situation has caused the social issue of how supports their healthy life. There have been some projects related to improve their quality of life and support their healthy life. Unfortunately mostly they focus the method of measuring vital signal and observing behavior. Nobody reports how utilize the measured data. Aim of our project is how find emergency of the aged people at home. As emergency is big different from regular life behavior, we have to recognize it. We propose concept of the human behavior model and show the some types human behavior knowledge constructed by observed human behavior model and show the some types human behavior knowledge constructed by observed human behavior. This idea is based on human having habitual life. And we discuss the possibility of finding emergency using knowledge and observed data.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.18 no.1
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• pp.72-82
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• 2010

This study investigated how air traffic controllers (ATCs) perceive the visual information on radar screen and examined quantitative and qualitative differences as a function of expertise. Little research has shown that how much information is processed by ATC visually and perceptually, how ATCs represent the information, and what difference exists between experts and novices. Participants were asked to draw representing visual information on the blank sector map after a 5-second exposure. Data were analyzed by a superimposing method to identify correctly represented information. Results showed that the expert group had much larger size of chunking and their pattern was wider and more accurate than the novice group. The practical application and methodological implications are also discussed for further research.

• Journal of the Korea Institute of Military Science and Technology
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• v.10 no.1
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• pp.130-143
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• 2007

Using steady state aerodynamic theories, it has been claimed that insects and birds cannot fly. To make matters worse, insects and birds fly at low Reynolds numbers. Therefore, a recurring theme in the literature is the importance of understanding unsteady aerodynamic effect and how the vortices behave when they separate from the moving surface that created them. In flapping flight, birds and insects can modify wing beat amplitude, stroke angle, wing planform area, angle of attack, and to a lesser extent flapping frequency to optimize the generation of lift force. Some birds are thought to employ two different gaits(a vortex ring gait and a continuous vortex gait) and unsteady aerodynamic effect(Clap and fling, Delayed stall, Wake capture and Rotational Circulation) in flapping flight. Leading edge vortices may produce an increase in lift. The trailing edge vortex could be an important component in gliding flight. Tip vortices in hovering support the body weight of the hummingbirds. Thus, this study investigated how insects and birds generate lift at low Reynolds numbers. This research is written to further that as yet incomplete understanding.

• The Journal of Society for e-Business Studies
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• v.1 no.1
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• pp.117-140
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• 1996

CALS is recognized as a national response to the new chapter of information society. It is essential that the standardization in Korea should be constructed compatible with not only domestic but also international standardization trend. This study aims to propose a proper direction of CALS standardization in Korea, based on the international CALS standardization movement. This paper classifies standard into five types and provides a proper direction and guidance far each standard. As a trend of CALS standard, all ten data files are converted using SGML standard far the interchangeability of data among heterogenous systems. CAD and Graphic data arc also moving toward to the STEP as their standard. In this regard, this paper discusses how to implement SGML and STEP Model. Finally, this paper proposes a method how to construct an EDI system with CALS standard and how to establish a standard authorization institute which will be responsible far the standard authorization. Furthermore, this paper also proposes the CALS Test Network (CTN) as its experimental method.

• Korean Institute of Interior Design Journal
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• no.17
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• pp.223-233
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• 1998

We intend to illustrate how contemporary architects have conceptualized spaces with words. Language practice is so much important work for the contemporary architects as designing realistic building (material practice) As this point of view we need to interest in theses of architects which contains their unique ideas an characters. The purpose of this study is for understanding how contemporary japanese architects embody through special conception when day design the mixed wooden construction and for looking for the possibility of the development of it. As a result the mixed wooden construction candy understood as an expression form how an architects things about relationship between parts and parts, parts and the whole and the character of materials that consist it and such relationship is determined by the requirement of space.

• Korean Journal of Human Ecology
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• v.13 no.5
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• pp.673-681
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• 2004

The purpose of this study is to examine grandparents' role to their grandchildren, the role type, and the variables that influence the role. For this purpose, data were collected from 542 grandparents through questionnaire. The main findings are as follows: 1. The most frequent role activity that grandparents perform include 'advising their grandchildren to be successful,' 'encouraging them to study hard,' 'having them help housework,' and 'teaching them how to behave', whereas the least one is 'to teach things such as cooking, paduk, and chess.' 2. Supporting role, educating role and raising role are three types of grandparents' role activity to their grandchildren. 3. One of the significant variables affecting their role level is living arrangement of grandparents. In addition, age, economic level, and educational level are partially effective variables in grandparents' role, along with whether they work or not, how often they meet their grandchildren, and how old their grandchildren are. However, it is not among significant variables whether they are healthy, or whether they are paternal or maternal.

• Journal of the Korean Institute of Landscape Architecture
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• v.33 no.1 s.108
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• pp.58-70
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• 2005

Management practices and ordinances for urban scenic view protection are varied by cities because they have their distinctive nature and social environment. Therefore landscape management methods for urban scenic views are generally varied by the characteristics of city landscape and ordinance. This case study for scenic view protection practices in U.S.A. is very meaningful and appropriate because cities initiate a plan and/or an ordinance to manage urban scenic view in Korea. Urban scenic view protection methods were analyzed based on followings: 1) how to select scenic view resources and define spatial areas for preserving them, 2) how to control building height, open view corridor and guide landscaping and 3) how to carry out view protection methods and organize them in laws or ordinances. Findings of this study will be applied usefully in the development of urban scenic view protection methods in Korea.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.252-255
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• 2003

This article concerns the event management of the transportation and delivery system in the real time environment. Until now mainstream researches in the transportation and delivery area have largely focused how to create optimized vehicle routing schedule fast and stably, although the execution and event management area has a lot of opportunities which could make logistics efficient and especially customers satisfied. This paper suggests to-be model processes how to execute vehicle routing schedule correctly and when events are occurred how to cope with them effectively. To embody such ideas GIS, GPS and Mobile technologies are attached on optimizing scheduler engine, TMS, WMS, ATP and Monitoring system.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.137-140
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• 2007

We consider the optimum air flow channel design for DMFC's in the present study. The effect of pressure drop across the inlet and outlet of a stack on the performance of a DMFC is the optimization of such geometric parameters is crucial to minimize the parasitic power usage by the auxiliary devices such as fuel pumps and blowers. In this paper, we present how the pressure drop control can optimize the driving point of a DMFC stack. Further, we show how the optimal fuel utilization ratio can be achieved, not degrading the performance of DMFC stacks. Overall, we discuss how the flow channel design affects the selection of balance of plant(BOP) components, the design of DMFC systems and the system efficiency.