• Journal of the Korean Institute of Gas
• /
• v.22 no.6
• /
• pp.28-33
• /
• 2018

Currently, the government has been expanding the supply of semi-low-pressure in order to solve the problems of unsupplied area of city gas and to secure the economical efficiency of small supplied area. It is mainly supplied from the central storage tank to each household by buried piping. It is necessary to provide such a shutoff valve that can block the excess flow gas due to pipeline leak or rupture when piping is damaged by other construction. For this study, System CFD code named Flownex has been used and a component corresponding to the actual EFV was developed. We compared Flownex results with experimental data to verify the accuracy of Flownex and confirmed the error rate to be around 2%. In this study, pipeline network modeling was done by selecting the LPG supply pipeline in a village and installed the component of the EFV at each junction. We selected the longest pipeline from the main pipeline and set scenarios so that the excess flow occurs by that the pipeline is ruptured before entering the household. The excess flow occurs by the pipeline rupture and the EFV is closed. At this time, we analyzed backflow effects to the other pipeline by closing EFV.

• International Area Studies Review
• /
• v.20 no.1
• /
• pp.147-165
• /
• 2016

We empirically examine the validity of second generation endogenous growth theory suing 21 OECD countries' panel data(1981~2011). Due to non-stationarity in all variables, we test the cointegrated relationships strongly supporting the semi-endogenous growth model. In the estimation of total factor productivity growth function, the growth of domestic and foreign R&D investment levels statistically significantly affect total factor productivity growth. R&D intensity, however, has significant impacts on the total factor productivity growth only in a few models, and international technology gap also has positive impacts on GDP growth. Thus the semi-endogenous growth model is relatively supported while fully endogenous growth model is weakly and occasionally supported in OECD countries. The policy implication of supporting the semi-endogenous growth model is that the sustaining growth requires increasing R&D expenditures.

• Journal of Wetlands Research
• /
• v.24 no.3
• /
• pp.161-169
• /
• 2022

In this study to estimate suitable size of rain tank in Suwon district, monthly rainfall, daily rainfall duration curve and daily rainy days have been analyzed. Annual rainwater consumption and daily average amount of storage with respect to size of rain tank have been calculated by applying continuity equations that take account of daily rainfall, daily consumptive use, storage of rain tank, It has been shown that above 50 mm of rainfall in the ordinance related to reclamation water may be inappropriate regulation if annual amount of rainfall captured, efficiency of utilized rainwater, number of days for utilized rain tank, daily average amount of storage and daily consumptive use have been considered. Thus, it has been shown that suitable size of rain tank should be determined considering reasonable daily consumptive use with respect to district, constructed cost of rain tank and benefit of rain tank constructed.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.30 no.6D
• /
• pp.561-567
• /
• 2010

Recently, several number of Multi-Intermodal Transfer Center are nominated to improve convenience of public transportation user. Due to budget constraints, it should be defined which is the first consideration among the discussed many works. In this circumstance, there are some absurdities in the evaluation of validity of existing methods. Therefore, we suggested the Priority Order Valuation for Multi-Intermodal Transfer Centerer. The evaluation method, we suggested, is considered quantitative analysis and qualitative analysis. In this study, we find out that B/C ratio and construction costs are strongly related to the quantitative analysis so that Multi-Intermodal Transfer Centers in metropolitan area are evaluated the positive results. Therefore, both quantitative analysis and qualitative analysis are applied to the Priority Order, metropolitan area and other area are fairly evaluated the results for the Priority Order.

• Journal of the Korean Society for information Management
• /
• v.33 no.4
• /
• pp.77-101
• /
• 2016

Recently, attention has been drawn to a new form of a public library, that is, a public library in a complex facility constructed in the same building or site with another facility. To get active users' or local governments' supports in the public library in a complex facility, it is necessary to build library strategic plans based on the analysis of users' evaluation and demands. Thus, this study analyzed the user satisfaction and perception of the 28 public libraries in complex facilities in Seoul. As a result, it was found that most users overall satisfied with public libraries in complex facilities in terms of human resources, information resources, and the links among services and positively perceived their environments and services. In order to provide more satisfaction to the users in public libraries in complex facilities first, it is necessary to improve the accessibility of libraries, to secure the sufficient library space, to prevent the outside noise, to link the facilities which bring mutual synergistic effect, and to develop a program and service accompanying other facilities.

• The Journal of the Korea Contents Association
• /
• v.15 no.10
• /
• pp.214-224
• /
• 2015

The purpose of this study is to establish the social support system for social integration by analyzing the effect of multicultural experiences on multicultural perception and stereotype and the meditating effect of multicultural perception. The research result is summarized as follow : First, multicultural perception is differently influenced according to multicultural experiences. That is, multicultural experiences have found to have the positive effect on multicultural acceptance and the negative effect on rejection about other cultures or prejudice about other cultures. Second, the result which analyzed the effect of multicultural perception on stereotype has found that acceptance about other cultures doesn't have any effect on stereotype. However, it can be found that the prejudice and rejection about other cultures are verified to be the variables which have the positive effect on stereotype. Third, the result which analyzed the direct effect of multicultural experiences on stereotype and the indirect effect through multicultural perception has found that multicultural experiences don't have any direct effect on stereotype, but do have the indirect effect through multicultural perception. With the help of information technology.

• The Journal of the Korea Contents Association
• /
• v.19 no.8
• /
• pp.293-302
• /
• 2019

The purpose of this study was to examine the reliability and validity of Stroke Impact Scale 3.0 (SIS 3.0). Here, the SIS 3.0 was completed by 154 stroke patients (mean = 62.7; standard deviation [SD] = 9.43). Construct validity was verified by analyzing the correlation between SIS 3.0 sub-domains, and convergent validity was investigated by analyzing the correlation between the Modified Barthel Index (MBI) and the Mini-Mental State Examination-Korean (K-MMSE) version. The characteristics of each item were analyzed by internal consistency and item discrimination based on the classical item theory. Construct and convergent validity were verified through this study. Although the item i included in the emotion domain showed low item discrimination, all but this item showed high discrimination. Internal consistency was also high in all sub-domains.

• Convergence Security Journal
• /
• v.20 no.5
• /
• pp.81-88
• /
• 2020

China, since the early days, according to their ideology, neighboring countries and their citizens were under their sphere of power. This means that only the Hanzu are real native Chinese and the other minor ethics groups are technically immigrants. The People's republic of china, part of the chinese communist party, has had rapid economic growth after Deng Xioping took over and implemented various expansionist policies and reforms, opening china to the world. Internally, the minority ethnic groups were forcibly relocated to specific regions, prohibited from using their native languages, and their culture was absorbed or incorporated into the Hanzu culture in an attempt to internally suppress or erase them. Externally, various projects such as the 'Xia-Shang-Zhou Chronology Project', 'Origins of Chinese Civilization Project', 'Northeast Project', 'Northwest Project', and the 'Southwest Project' were implemented to spread their culture and history to neighboring countries in an attempt to expand their territory. In addition, as capitalism spreads throughout china through reforms and its expansion, it has pioneered the one belt one road aiming to secure as safe transit and raw materials, expand their military facilities, and expand their export market. By doing so, China is infringing on other countries' politics, economy, and borders, and as a result there is a need for Korea to also reexamine its policies in all fields related to china such as politics, economy, history, and culture.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.11 no.3
• /
• pp.282-288
• /
• 2023

In this study, we analyzed the amount of roadside fine dust generated from newly constructed specially modified asphalt pavement and general asphalt pavement from existing roads. We collected the 1,000 g (100 g/day) of dust samples from the roadside of the express bus terminal and commercial facility area in Chungcheongnam-do's C site at three-day intervals during the summer of 2022 and 2023. The collected samples were separated from fine dust according to size in the 75-150 ㎛ range and, were separated only from Tire and Road Wear Particles through density separation. No.1-3 are general asphalt pavement section as an existing road. Fine dust and Tire and Road Wear Particles in No.1-3 were 24.27 g, 24.36 g, 0.53 g, and 0.53 g, respectively, and the quantitative results for 2022 and 2023 were similar. On the other hand, No.4-6 are newly constructed specially modified asphalt pavement section. Fine dust decreased by 14.8 % and tire and road wear particles decreased by 29.6 % in 2023 compared to 2022 in No.4-6. In addition, according to the results of thermogravimetric analysis, Tire and road wear particles in No.1-3 are tire and road components at 30 % and 70 %, respectively. And Tire and road wear particles in No.4-6 are tire and road components at 35 % and 65 % in 2023, respectively. From these results, it was confirmed that the newly constructed specially modified asphalt pavement can be effective in reducing roadside fine dust and Tire and Road Wear Particles. However, there may be some shortcomings in conclusive research results due to limited space and sample collection period. In the future, we plan to conduct various case studies.

• 한국HCI학회:학술대회논문집
• /
• 2006.02a
• /
• pp.1246-1251
• /
• 2006

본 연구에서는 영역 분할 알고리즘과 3차 스플라인 보간법을 이용하여 스테인드 글라스 렌더링을 위한 개선된 유리 타일 생성 알고리즘을 제안하였다. 먼저 유리 타일의 초기 형태를 추출하기 위하여 입력 영상에 Mean shift 분할 알고리즘을 적용하였다. Mean shift 분할 알고리즘은 영상의 각 픽셀(pixel)에서의 지역 밀도 최대 점(local density maximum)을 찾아 클러스터링(clustering)하는 알고리즘으로 영상을 효과적으로 분할할 수 있다. 그리고 분할된 영역에서 영역을 사용자 입력으로 병합하고, 영역에서 부적절한 형태를 없애기 위해 본 연구에서는 형태론적 연산(morphological operation)을 이용하였다. 추출된 영역으로부터 유리 타일의 형태로 만들기 위하여 추출된 각각의 영역에 3차 스플라인 보간법(cubic spline interpolation)을 적용하여 경계가 완화된 영역과 납틀(leading)의 형태를 얻는다. 그 다음 영역을 스플라인 곡선(spline curve)을 이용하여 재분할하고, 각 영역에 변환(transformation)된 색상을 적용하여 최종적인 유리 타일을 만들어낸다. 본 연구에서는 3차 스플라인 보간법을 이용하여 실제 스테인드 글라스에서 생길 수 있는 부드러운 경계를 갖는 유리 타일의 형태를 만들어 이를 스테인드 글라스 렌더링에 이용하였다. 이 방법은 기존의 영역 분할 알고리즘에 형태론적 연산만을 적용하여 유리 타일의 형태를 생성하는 것보다 효과적으로 유리 타일의 형태를 생성할 수 있다. 또한, 생성된 영역에 재분할 과정을 거쳐서 작은 유리 타일이 모여서 이루는 조형적인 형태를 이룰 수 있도록 하였다.