• Journal of Korean Association for Spatial Structures
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• v.9 no.4
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• pp.73-80
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• 2009

It is very important that predict the inelastic seismic behavior exactly for seismic performance evaluation of a building in the performance based seismic design. But, it is difficulty that predict the building behavior of actual and exact in simplified load-deformation relation of structural material and members. In this study, system ductility and story ductility capacity of building structure used to the Backbone hinge Model are estimated and compared considering the characteristics of load-deformation relation of structural material and members. Analyses results, bilinear hinge model has lower system ductility and story ductility demands than those of backbone hinge model.

• Journal of the Korean Society of Propulsion Engineers
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• v.3 no.3
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• pp.53-61
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• 1999

Impinging jets are observed when exhaust gases from missiles or V/STOL aircrafts impinge on the ground, flame deflector, ship deck, etc. The flow shows different patterns according to the nozzle geometry, nozzle-to-plate distance, and plate angle, for example. This paper describes experimental works on the phenomena (pressure distribution, occurrence of stagnation bubble, and so on.) when underexpanded supersonic jets impinge on a perpendicular flat plate using a supersonic cold-flow system, and compares the results with those obtained using a shock tunnel. The flow characteristics for the supersonic cold-flow system were also investigated. Surface pressure distribution of supersonic cold-flow system differed from that of shock tunnel because of water and temperature in the low-pressure chamber. Surface pressure distribution as to underexpanded ratio showed similar patterns together.

• Journal of the Korea Convergence Society
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• v.9 no.2
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• pp.207-215
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• 2018

In this study, targeting KOSPI and KOSDAQ listed companies, the relationship between the abnormal investment of companies and analyst earnings forecasts was empirically analyzed. The analysis period of this study spanned from 2003 to 2015 (with that of dependent variables spanning from 2004 to 2016) based on the variables of interest, and among the companies whose earnings per share forecasts were announced by financial analysts, the final sample of 4,917 companies/year that meets the research condition was selected as the target analysis. The results of the empirical analysis are as follows. First, it turned out that the more total abnormal investment, abnormal R&D and abnormal CAPEX investment, the more accurate were analyst earnings forecasts. Second, the more total abnormal investment, abnormal R&D, abnormal CAPEX investment, the more pessimistic analyst earnings forecasts tended to be. Further analysis has shown that these results came more from over investment groups than under investment groups. The results of this study are expected to make additional contributions to the existing studies in that the abnormal investment is considered as a determinant of analyst earnings forecasts.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.spc1
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• pp.52-57
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• 2006

This research was carried out to determine the effect of controlling nitrogen application on tiller development, yield, and quality of rice under scanty or excess seedling stands in direct-seeded rice on flooded soil surface. Seedling stand was set to 3 levels: scanty $(60/m^2)$, optimum $(120/m^2)$, and excess $(200/m^2)$. In the scanty plot, additional 4 kg/10a nitrogen was applied at the 3rd leaf stage to promote tiller development. On the other hand, applying 3.3 kg/10a nitrogen at 5th leaf stage in the excess plot was omitted to suppress tillering. Maximum numbers of tillers per plant were 15.2 and 8.6 in scanty and excess plots, respectively, as compared with 9.8 in optimum plot. Productive tiller rate decreased with the increase in number of seedling stands. Regardless of seedling density, the first tiller developed on the 3rd node of rice stem from the bottom. The primary tillers developed at 3, 4, 5, 6, 7 nodes in scanty plot, 3, 4, 5 nodes in optimum plot, and 3, 4 nodes in excess plot. The secondary tillers developed only in some portion of plants in scanty and optimum plots. The order of tiller emergence was negatively correlated to stem length, panicle length, non-productive tiller number, grain number per panicle, and fertility in scanty plot, and to perfect grain ratio in excess plot. In the optimum plot, however, the order of tiller emergence was not correlated to any of the mentioned characteristics. The perfect grain ratio of scanty plot was the highest because green-kerneled rice was a very small portion in the primary tillers as compared with those of optimum and excess plots. Yield indexes of scanty and excess plots were 99%, and 97%, respectively, of the yield (494 kg/10a) in optimum plot. In conclusion, when seedling stands are not at optimum level, rice yield and quality similar to optimum planting density level can be obtained by means of controlling nitrogen application.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.1
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• pp.3-14
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• 2002

The purpose of this study was to examine conspicuous consuming tendency and imported-brand preferences based on purchasing behavior of clothing. 464 women living in Seoul were collected for this study. For data analysis, descriptive statistics, Pearson's correlation analysis, ANOVA, Duncan's multiple range teats, and $X^2-test$ were used. As the result, five factors in conspicuous consumption are generated from the factor analysis. Consumers with high conspicuous consumption prefer imported-brand clothing. According to the levels of conspicuous consumption, purchasing behaviors of clothing are significantly different in information usages, clothing selection evaluations, patronage store types, purchasing frequencies, and seasonal clothing expenditure. Finally, clothing purchasing behaviors are significantly different by imported-brand clothing preference in information usages, clothing selection standards, and patronage store types.

• Journal of Families and Better Life
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• v.13 no.2
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• pp.68-77
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• 1995

본 연구는 급속한 산업화와 현대화 과정에서 파생괸 과소비 호화혼수, 재벌의 변칙 적인 부의 세습, 상류층내의 배타적인 결혼 지나친 교육열, 환경오염등과 같은 다양한 가족 이기주의 현상의 심각성을 재인식하고 이에 영향을 미치는 요인을 살펴봄으로써 가족이기주 의의 예방을 개선을 도모해 나갈 기본자료를 마련하는데 목적을 두고 있다 서울시에 거주하 는 기혼남녀 333명을 대상으로 가족이기주의 행동의 실태와 이에대한 사회인구학적 변인과 가족주의 가치관의 영향을 살펴본 결과 가정내에서의 가족이기주의 행동에 영향을 미치는 변인은 성별($\beta=.238$), 교육수준($\beta=.237$), 소득($\beta=.188$), 가족우선성의식($\beta=.156$), 형제자매 및 친척간 사회경제적 연대의식($\beta=-.155$)이었고, 교육에서의 가족이기주의 행동에 영향을 미치는 변인은 소득($\beta=.233$), 성별($\beta=.200$), 연령($\beta=.176$), 교육수준($\beta=.156$)이었으며, 환경에서의 가족이기주의 행동에 영향을 미치는 변인은 소득($\beta=.263$)인 것으로 나타났다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2003.05a
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• pp.27-31
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• 2003

An experimental investigation for impingement of under-expanded, axisymmetric jets on a flat plate has been conducted, and the surface pressure, the adiabatic wall temperature distributions on the plate have been measured in detail at small nozzle-to-plate distances. the pressure ratio and the nozzle-to-plate distance have been considered as experimental parameters.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.175-176
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• 2014

데이터 병합은 무선센서네트워크에서의 근본적인 문제로 최근 몇 년간 큰 주목을 받고 있다. 본 논문은 무선센서네트워크의 분산 환경에서 네트워크의 에너지 효율 및 데이터 병합에 대해 다룬다. 기존 딜레이 효율 네트워크 구조는 센서의 전송범위가 제한 없이 네트워크를 구성했지만, 제안 알고리즘은 제한된 전송범위를 고려하여 네트워크를 구성한다. 센서들의 에너지 소비는 보다 거리가 먼 노드간의 통신으로 과소비 되는 경우가 많지만, 제안 알고리즘을 사용하여 상대적으로 거리가 먼 노드간 통신을 막아 에너지 소비를 줄일 수 있다. 데이터 병합 시 주요 방해요소인 primary interference를 고려하며 트리를 구축한다. 제안 기법에 의해 구축된 네트워크는 데이터 병합 딜레이를 최소화되고, 에너지 효율이 향상될 것이다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.05a
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• pp.185-190
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• 1998

요즈음 국제 에너지 회의 등에서 에너지가 더 이상 공공재가 아니며, 소비재로서 적정한 서비스 대가를 받아야 한다는 지적이 자주 거론된다. 그동안 경제성장 과정에서 우리 제품의 해외 가격경쟁력을 높이기 위해 정부가 에너지 가격을 인위적으로 낮게 추진해온 바 있다. 이 같은 저에너지 가격정책이 에너지 과소비와 비효율적 사용을 부추긴 원인의 하나였다고 볼 수 있다. 최근 국제 경제위기가 촉발된 '97년 말부터 에너지 가격이 폭등하였는데, 이것이 비록 정책적인 원인에 의한 것이라기보다는 환율 급등에 따른 것이었지만, 그 여파로 에너지 소비가 줄어드는 현상이 나타나게 된 것이 이점을 증명해준다 하겠다. (중략)

• Proceedings of the Korean System Dynamics Society
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• 2003.08a
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• pp.25-48
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• 2003

복잡한 시스템의 악순환 고리를 끊는다는 것은 많은 어려움과 또 다른 구조적인 문제를 초래할 수도 있다. 우리나라의 수도권과 비 수도권간의 격차 문제는 복잡한 시스템의 악순환 구조를 보여주는 대표적인 사례일 것이다. 수도권으로의 정치, 경제, 사회적 집중과 상대적으로 비 수도권 지역의 과소·소외 상황은 어세, 오늘의 문제가 아니라 지난 40여년 이상 누적되어 온 과제라고 할 수 있다. 수도권의 집중이 가속화되는 동안 정부는 이를 완화시키기 위하여 각종 조치를 취하여 왔다. 그러나 수도권으로의 기능 집중은 지금도 진행되어 오고 있으며, 정부의 관련 정책들의 효과는 상대적으로 미약한 수준이다.(중략)