• Journal of the Korea Institute of Building Construction
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• v.15 no.6
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• pp.641-651
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• 2015

With its recent tourism boom, Vanuatu, a small country in the South Pacific, is experiencing an increasing demand for construction. However, it has been struggling with persistent schedule delays in their construction projects due to a variety of reasons. In an attempt to respond to this situation, this paper aims to identify the major causes of schedule delays in building construction in Pacific island countries, with a focus on Vanuatu. To collect data on the factors affecting schedule delays, face-to-face interviews were conducted. Based on these, seven major causes of schedule delays, as selected by the majority of the participants, were identified and discussed to provide perceptive insights for future improvement opportunities. This paper attempts to help contractors with limited resources better understand the major causes of schedule delay in Vanuatu and achieve better performance in building projects.

• Proceedings of the KSME Conference
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• 2001.06e
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• pp.373-379
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• 2001

When a train runs into a tunnel at high-speed, aerodynamic drag suddenly increases and the booming noise is generated at the exit of tunnel. The noise shape is very important to reduce the aerodynamic drag in tunnel as well as on open ground, and the micro-pressure wave that is a source of booming noise is dependent on nose shape, especially on area distribution. In this study, the nose shape has been optimized employing the response surface methodology and the axi-symmetric compressible Navier-Stokes equations. The optimal designs have been executed imposing various conditions of the aerodynamic drag and the micro-pressure wave on object functions. The results show that the multi-objective design was successful to decrease micro-pressure wave and aerodynamic drag of trains.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.127-128
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• 2009

CCP방식의 식각에 있어서 CF4/O2 Plasma Etch에 Ar을 첨가함으로써 Etch특성이 어떻게 변화하는지를 조사하였다. FE-SEM를 이용하여 Etch Profile를 측정하였다. 또한 Elipsometer와 Nanospec을 이용하여 Etch rate를 측정하였다. Ar의 비율이 전체의 47%정도를 차지하였을 때까지 Etch Profile이 향상되었다가 그이후로는 다시 감소하는 것을 볼 수 있었다. Ar을 첨가할수록 etch rate은 계속 향상되었다. Ar을 첨가하는 것은 물리적인 식각으로 반응하여 Etch rate의 향상과 적정량의 Ar을 첨가했을 때 Etch profile이 향상되는 결과를 얻었다.

• The Research Journal of the Costume Culture
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• v.6 no.4
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• pp.175-187
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• 1998

Hats are an important part of the fashion accessory business and Their importance is increasing year by year. Their importance is increasing not only as a means of accessory ut also as a means of sportswear due to the leisure-sports boom of the 90's. As hats are becoming more and more popular and ready-made, demand for comfortable and easy-fitting hats are increasing. Being an piece of apparel, fitting is very important factor in hats as well s in other forms of clothing. But many hat-wears complain of dissatisfaction of fitting of their hats. In addition to this, another problem is hat most hat designs have been flown in from the West without inspection of their fits. Designs to fit the Koran face and head have not been developed properly. This study is based on the need for the development of a well-fitting hat pattern design for Korean young women. After taking actual measurements of 170 young womens, a size system was organized for developing patterns for different size groups.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.9 no.2
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• pp.59-65
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• 2000

In this paper the comparison of the first order approximation schemes such as SLP(sequential linear programming) CONLIN(convex linearization) MMA(method of moving asymptotes) and the second order approximation scheme SQP(sequential quadratic programming) was accomplished for optimization of nonlinear structures. It was found that MMA and SQP are the most efficient methods for optimization. But the number of function call of SQP is much more than that of MMA. Therefore when it is considered with the expense of computation MMA is more efficient than SQP. In order to examine the efficiency of MMA for complex optimization problem it was applied to the helicopter tail boom con-sidering column buckling and local wall buckling constraints. it is concluded that MMA can be a very efficient approxima-tion scheme from simple problems to complex problems.

• Journal of the Korean Professional Engineers Association
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• v.30 no.4
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• pp.18-29
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• 1997

The telecommunications industry pro-grossed as old media, but new media is going into a new era of multi-media in the 21st century. In the latter half of 1970s we saw a boom of new media as a post-telephone era began. As the machines grew to the world level(standard), facsimiles, minitels of France and word processors of Japan were developed. Today some 15 years since the advent of new media era, the progress of technology is astonishing. Advancement of technology is seen in V and U letters attached to semiconductor chips, astonishing capability advancement of light emitting lasers and photo-diodes, etc and additionally technology advancement in large capacitized light disks. Thus these technologies have made possible transmitting a broad band network and a mobile communication and digitalized broadcasting. Increased capacity of every terminal, e.g, "letters $.$ voice $.$ still and mov-ing pictures" are essential for new media simultaneous and two -way transmission.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.244-250
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• 2003

국내에 보급된 방제기는 인력분무기, 동력 분무기, 동력 살분무기, 스피드 스프레이어, 붐방제기 등이 있다. 그 중 동력경운기에 탑재하거나 트랙터에 견인되는 동력분무기를 주축으로 기계화되어 있다. 작은 입경의 분무입자로서 가급적 적정량을 균일하게 뿌릴 때 방제효율을 높일 수 있는데도 불구하고, 동력분무기에 의한 액제 살포는 원거리 살포에 따라 분무입자의 입경 분포가 다양하며 대부분 분무입자가 매우 크므로 고른 살포를 기대하기 어렵기 때문에 약액을 1000대 1로 희석하여 흠뻑 적실 정도로 다량 살포를 하여 살포효율을 높이고 있다. 그러나 이러한 방제 방법은 효율성, 작업능률과 환경의 오염 측면에서 상당한 문제로 지적되고 있다. (중략)

• Korean Institute of Interior Design Journal
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• no.34
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• pp.140-148
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• 2002

This Study is concerned with the present condition and prospect of architectural stained glass in Korea. Stained glass had been architectural art from the origin. But it had declined since the Renaissance era, and began to revive in the early 20th century. The stained glass inflowed with church architecture occasionally by the western missionaries. And it has been developed actively since 1980' with the boom in church building. There are about 30 studios which are making stained glass in Korea, but very few studio work true architectural stained glass. Stained glass is still treated as simple decoration or 2-dimensional mosaic. Architect and interior designer even have little understanding of architectural character of stained glass.I have considered the problems and prospected architectural stained glass which inspire modern architecture with human sensitivity in Korea.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.39-42
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• 2003

A community can have a physical presence or can be formed from a group of people who communicate remotely via a conference call, a fixed Internet chatroom or instant message solution and most recently, a mobile handset. The mobile handset gives community members the advantage over fixed line or physical communities that they are not constricted by time or place as to when they can communicate with any members of their community. Operators, riding on the back of the SMS boom, are deploying community applications to increase both average revenue per user and customer loyalty. The purpose of this study is to find the effects of the characteristics of mobile community on the consumers'satisfaction and loyalty so that operators'participation in mobile community could be enhanced. A general model for the study was proposed with three independent variables. The variables are community usability(dialog and social support, information design, navigation, access), community sociability (purpose, people, policies), and mobile community content(location, personalization, immediacy, availability).

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.606-609
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• 1995

To stabilize a satellite, a spin stabilization method is used for attitude control. The spin stabilization uses the centrifugal force of a pendulum damper which is tilted long boom, to stabilize the unstable satellite. In this paper, an inverted pendulum system is implemented which is similar to the spin stabilization method. Study on the velocity of the rotation axis and the inverted pendulum's angle stability is shown. We designed a controller using a 32bit TMS320C31 DSP for the CPU and also performances by PLD control and Sliding Mode Control is compared.