• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2923-2934
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• 2009

This paper presents study on technological forecasting of Next-Generation Display technology. Next-Generation Display technology is one of the emerging technologies lately. So databases on patent documents of this technology were analyzed first. And patent analysis was performed for finding out present technology trend. And the forecast for this technology was made by growth curves which were obtained from forecast models using patent documents. In previous study, Gompertz, Logistic, Bass were used for forecasting diffusion of demand in market. Gompertz, Logistic models which were often used for technological forecasting, too. So, two models were applied in this study. But Gompertz, Logistic models only consider internal effect of diffusion. And it is difficult to estimate maximum value of growth in two models. So, Bass model which considers both internal effect and external effect of diffusion was also applied. And maximum value of growth in Gompertz, Logistic models was estimated by Bass model.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.3
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• pp.333-342
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• 2022

Due to climate change, increased heavy rainfalls result in flood damage every year. To investigate the storm-runoff reduction effects of Low Impact Development (LID), this study performed runoff analyses using the U.S. Environmental Protection Agency (EPA) Storm Water Management Model (SWMM) for past and future representative storm events of the Yongdu Rainwater Pumping Station basin. As a result, the infiltration loss for representative future rainfalls increased by 3.17 %, and the surface runoff and peak runoff rate increased significantly by 32.50 %, and 128.77 %, respectively. To reduce the increased surface runoff and peak runoff rates, this study investigated the applicability of LID approaches, including a permeable pavement, green roof, and rain garden, by adjusting the LID parameters and the ratio of installation area. We identified the ranges of LID parameters that decreased peak runoff rate and surface runoff, and increased infiltration. In addition, when the application ratio of permeable pavement, green roof, and rain garden was 2:1:3, best performance was attained, leading to a reduction of peak runoff of 26.85 %, infiltration loss 12.01 %, surface runoff 15.11 %, and storage 509.47 %. Based on analyzing the effect of storm runoff reductions for various return periods, it was found that as the return period increased, the proportion of peak runoff and surface runoff increased and the proportion of infiltration loss and storage decreased.

• Journal of the Korean Society for Library and Information Science
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• v.31 no.4
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• pp.113-137
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• 1997

Bylaw Is essential to assuring continuity and preventing disagreements and misunderstanding. But library bylaws of the wide-area self-governing cities in Korea are complicated In structure and violated the law according to administrative authorities. Therefore, the purpose of this paper is to suggest an integrated bylaw model including goal of bylaw operations of library : the library director officers : branch libraries : substructure, use rules : assigned materials promotion committee of library promotion fund ; amendment procedures, etc.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.13 no.3
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• pp.254-261
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• 2001

It is well known that when long waves propagate from deep ocean onto a continental shelf with a very steep continental slope, the waves reflected from the shore can not propagate offshore and are re-reflected from the continental slope so that large water level fluctuations are induced near the shore. Liu(1986) has analyzed this phenomenon by assuming a topography which has a depth discontinuity along a semicircular offshore boundary, but his solution is erroneous. In the present paper, we correct his analytical solutions for a straight shoreline and a rectangular harbor. The corrected solution is then compared with the numerical results of the Galerkin finite element model of Jeong et al.(1998), which is based on the extended mild-slope equation.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.219-222
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• 2013

본 논문에서는 스크래치2.0을 활용한 초등정보영재의 프로그래밍 교육 방안을 제안하고자 한다. 스크래치는 블록을 쌓는 것만으로 프로그래밍이 가능하기 때문에 프로그래밍을 처음 접하는 초등정보영재 학생의 프로그래밍 교육과정으로 적합하다. 또한 2.0으로 버전업되면서 스크립트 보기(See inside)나 리믹스(Remix)기능이 추가되어 프로그램의 공유 및 협업이 더 용이하여졌다. 따라서 이러한 스크래치2.0의 기능을 사용한다면 학습자에게 필요한 협업 및 의사소통 능력을 기르게 하는데 적합하다고 할 수 있다. 또한 영재학생들은 학습자 스스로 목표를 정하고 계획을 능동적으로 수행해나갈 때 높은 성과를 보이는 특성이 있다. 따라서 자기 주도적 학습 모형을 영재학생들에게 사용한다면 더 효과적이다. 이에 본 연구에서는 스크래치 2.0을 활용하여 Treffinger의 자기 주도적 학습모형을 적용한 프로그래밍 교육 방안을 제안하였다. 추후에 초, 중, 고 영재기관 연계를 위한 프로그래밍 교육위계에 대한 연구가 필요하다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.7 no.1
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• pp.46-56
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• 1995

Three Pressure type wave gauges were installed for about 10 days for the analysis of long wave agitations in Mukho Harbor. Helmholtz and second resonant periods of seiche in Mukho Harbor are shown to be approximately 10.0-14.3 and 3.3 minutes from the spectral analysis of measured wave data. Amplification ratio at Helmholtz period reaches about 6.8 and the wave amplitudes in the harbor were in the range of 5-10 cm during the measurement period. Helmholtz and second resonant periods of seiche in Mukho Harbor agree very well with those computed using Jeong dt al. (1993b)'s model. The model gives rise to the first and third resonant peaks at 7.5 and 1.9 minutes, respectively.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.8 no.2
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• pp.174-184
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• 1996

In the present study, for fully-open rectangular harbors, sensitivity analyses are made for the major parameters which are relevant to the practical application of a hybrid element model widely used fur the analysis of harbor oscillation. The results show that it is desirable to extend the finite element region to the area in which depth change is not large and that it is appropriate to take the depth of the outer region for analytic solution as the average along the boundary between the two regions. It is expected that the number of Fourier components of the analytic solution may not be important for a constant-depth simple-shaped harbor but its significance may increase for harbors of varying depth and complex geometry. It is found that the effect of incident wave direction is not significant for the first resonance mode but its effect becomes important as the bottom slope increases, especially for the higher resonance modes.

• Journal of Korean Society of Transportation
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• v.31 no.1
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• pp.65-76
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• 2013

Traffic accidents at signalized intersections have been increased annually so that it is required to examine the causation to reduce the accidents. However, the current existing accident models were developed mainly by using non-linear regression models such as Poisson methods. These non-linear regression methods lack to reveal the complicated causation for traffic accidents, though they are the right choice to study randomness and non-linearity of accidents. Therefore, it is required to utilize another statistical method to make up for the lack of the non-linear regression methods. This study developed accident prediction models for 4 legged signalized intersections with Poisson methods and compared them with structural equation models. This study used structural equation methods to reveal the complicated causation of traffic accidents, because the structural equation method has merits to explain more causational factors for accidents than others.

• Journal of the Korean Data and Information Science Society
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• v.28 no.4
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• pp.853-862
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• 2017

In this study, we analyse the determinants of the youth employment rate of public agencies and local public enterprises. On the other hand the youth employment rate contains information of the youth employment rate and the size of the youth employment. We use pooled tobit model and panel tobit model since dependent variable is a censored form observed only in a certain area. The results of the analysis are summarized as follows. First, the panel tobit model is more statistically significant as compared to the combined tobit model. Second, the youth employment rate is more statistically significantly higher in 2014 and 2015 than in 2011. Third, the youth employment rate in public enterprises is more statistically significantly higher than that in local public agencies. Finally, the higher the average wage is, the lower the youth employment ratio is.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.454-457
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• 2008

교육에서 평가는 교육의 효과를 분석하고 개선하기 위해서는 학생, 교사, 교육 환경에 대한 평가가 이루어져야 한다. 학생에 대한 평가는 학습 과정에서 학생의 참여 행위가 평가되어야 한다. 기존의 교육 방법에서는 학생의 참여도에 대한 공정한 정보를 취득하기가 어려웠다. 그러나 u-learning에서는 이러한 정보들을 그전의 교육 방법에 비해 쉽게 공정한 참여도 정보를 얻을 수 있기 때문에 평가도 공정하게 할 수 있는 환경이 갖추었다 할 수 있다. 본 연구에서는 u-learning 환경에서의 학습자들의 학습 행위에 대한 평가를 하는 방법을 u-learning 시스템 모델과 함께 제안한다.