• Proceedings of the Korea Water Resources Association Conference
• /
• 2012.05a
• /
• pp.564-564
• /
• 2012

유역내에서 발생한 고탁수는 저수지로 유입됨으로써 용수 공급에 지장을 초래하고, 수환경 악화 및 하류지역의 정수비용 부담을 가중시키는 등 사회, 경제적으로 여러 가지 문제를 일으키고 있다. 우리나라 대부분의 다목적댐은 홍수기에 탁수로 인하여 다양한 문제를 겪고 있다. 탁수문제는 수중생태계를 파괴하고, 상수원을 오염시키며, 물이 가지는 관광자원으로서의 가치를 심각하게 훼손시키는 등 심각한 문제를 야기 시키고 있다. 특히, 최근에는 잦은 이상 집중강우 현상 때문에 탁수의 장기화 문제가 대두되면서 중요한 사회문제로 떠오르고 있다. 수자원의 효율적 이용을 극대화하기 위한 댐의 연결사업은 탁수의 인위적인 외곡이 발생하기 때문에 적절한 조절을 통해 그 영향을 최소화할 필요가 있다. 댐에서 물의 밀도는 온도, 염도 및 탁도 등의 변화로 인하여 일정하지 않고 시간과 공간에 따라 변화하며, 일반적으로 혼합되지 않고 밀도와 두께가 다른 층에 분리되어 존재한다. 여름철 집중 강우 시 유입되는 고탁수층은 저수지의 밀도성층으로 인하여 표수층 하부에 위치하며, 이를 적기에 배제하지 않을 경우에는 수평방향의 확산현상과 연직방향의 전도현상으로 인해 저수지 전역에 분포하게 되어, 탁수현상의 장기화를 유발한다. 본 연구에서는 EFDC의 댐의 수리 및 수질예측모형을 이용해 여름철 집중강우시 유입되는 고탁수의 도달시간과 탁수량 등을 예측 평가하였다. 댐의 취수탑이 설치되는 위치는 댐의 상류측으로 일반적인 댐 주변의 온도 및 탁수거동과는 다르기 때문에 이 부분을 반영하여 평가하여야 한다. 본 연구에서는 EFDC의 댐 수리 및 수질예측모형을 이용하여 여름철 댐으로 유입되는 탁수거동을 평가하고, 댐 연결터널로 유입되는 취수탑 앞의 탁수농도를 예측하여 적절한 선택취수를 통해 댐 연결로 인한 고탁수의 댐간 이동을 최소화하기 위한 취수설비 운영방안을 제시하였다. 총 6개의 홍수사상('99년 홍수, '02년 루사, '03년 매미, '06년 에위니아, '09년 홍수 등)을 선정하여, 홍수사상에 대한 시단위의 유입량자료를 이용하여 양 댐간 연결로 인한 탁수거동을 분석하였다.

• Resources Recycling
• /
• v.26 no.5
• /
• pp.29-38
• /
• 2017

This study suggests optimal policy options for collection of used diapers through benchmarking of foreign countries and perception surveys. By conducting a survey, this study can identify the actual problems involved in the collection process and enhance the social acceptance toward diaper recycling policies. As a perception survey result, the economic burden of emission bags and sanitary issues were most important for the collection pilot test. Respondents thought that twice-a-week collection frequency was appropriate and that free emission bags might be preferable to participants. Currently municipal wastes are subject to waste management laws, which are applied by local governments. Diaper waste is categorized with municipal waste, so it seems to be treated by municipal waste systems. In terms of connection with government, possible alternatives were suggested to identify the relevant local government. Useful data could be obtained, to determine the economical viability of any future diaper recycling system implementation in the entire Seoul metropolis and adjacent areas of dense population.

• The Journal of the Korea Contents Association
• /
• v.21 no.9
• /
• pp.644-651
• /
• 2021

This study used a qualitative research method to derive meaning through intensive interviews on stress, focusing on the subjective perceptions and experiences of college students about COVID-19. The study participants were 12 college students enrolled at University Y in Gyeonggi-do, and the questionnaires were 'How has your daily life changed due to COVID-19?' and 'What changes have you made in your environment due to COVID-19?', 'What kind of comfort/inconvenience did you experience due to COVID-19?'As a result of analyzing the stress experienced by university students due to COVID-19, the stress factors were found to be four types: concerns about academic quality, anxiety about disconnection from social relationships, burden due to decrease in jobs (part-time jobs), and health and safety anxiety. The results of this study, it seems that the university's efforts to optimize online classes, seeking social relationships through non-face-to-face, preparing policies for job creation for college students, and health management measures due to COVID-19 should be discussed.

• Journal of Korea Water Resources Association
• /
• v.54 no.9
• /
• pp.643-656
• /
• 2021

Recently, water supply management technology is highly developed, and a computer simulation model plays a critical role for estimating hydraulics and water quality in water distribution networks (WDNs). However, a simulation of complex large water networks is computationally intensive, especially for the water quality simulations, which require a short simulation time step and a long simulation time period. Thus, it is often prohibitive to analyze the water quality in real-scale water networks. In this study, in order to improve the computational efficiency of water quality simulations in complex water networks, a hierarchical water-quality-simulation technique was proposed. The water network is hierarchically divided into two sub-networks for improvement of computing efficiency while preserving water quality simulation accuracy. The proposed approach was applied to a large-scale real-life water network that is currently operating in South Korea, and demonstrated a spatiotemporal distribution of chlorine concentration under diverse chlorine injection scenarios.

• International Area Studies Review
• /
• v.16 no.3
• /
• pp.135-155
• /
• 2012

The objective of this study was to empirically analyze how Chinese urban residents use mortgage loan in their purchase of houses. For the research purpose, 205 households were surveyed on use of housing finance in Beijing, using prepared questionnaires in advance. The survey result showed that 39.5% of the respondents used mortgage loan in their housing purchase in Beijing. Most of the mortgage loan users got their loans from four state-owned commercial banks. This implies that the government could effectively govern the housing market by managing qualifications and interest rates under the government control. The households who did not use mortgage loan raised the fund mostly from own capital and their parents' money. In general, it was found that the Chinese, besides mortgage loan from commercial banks, rarely depend on outside sources. The dichotomous logistic analysis by logit model showed that socio-economic variables such as age, income, housing price and entry into the housing provident fund had significantly positive effects on the use of mortgage loan in the purchase of housing.

• The Journal of the Korea Contents Association
• /
• v.19 no.3
• /
• pp.328-335
• /
• 2019

Korea is entering into an "Aging Society" rapidly. In this currency, the Elderly Supporting Problems is emerging as a main issue of elderly welfare services policy. The study is based on the welfare panel data of 2016 (11th), and it is divided into the national selection group and the family selection group who are in charge of the elderly welfare services in terms of operation and delivery and financial burden. And analyzed the factors that affected the effect. As the result of the analysis, it is found that the higher the age of the elderly, the higher the age and education level, The more we experience welfare services, the more we receive public pensions, the greater the responsibility of the elderly, the greater the elderly spending. It is meaningful to provide basic data for solving the elderly supporting problem at the present time which is not sufficient for the elderly welfare system.

• Convergence Security Journal
• /
• v.18 no.2
• /
• pp.149-158
• /
• 2018

Military officials in Korea are forced to change jobs early due to the retirement age after active service. Measures are needed in view of the 55% average employment rate of middle and long term soldiers during the last five years. The last government of Park Geun-hye push ahead creating of 50,000 jobs in discharged soldier with policy, but the results were not great. Therefore, it is time to drastically change the government's efforts to create large-scale jobs for discharged soldiers. It is necessary to break away from the traditional ways of expanding opportunities for employment at the academic level. So it became necessary for discharged soldiers to actively review ways to build their own organizations. For such reasons, this study presents a measure to create job through food service, Security personnel training and Manpower provision business, Special Soldier Control and Training Center Operation business, Han River Water Cleaning Project, Caring business, and delivery business by establishing their own social cooperation to create jobs for discharged soldiers.

• Journal of Industrial Convergence
• /
• v.18 no.6
• /
• pp.107-117
• /
• 2020

The purpose of this study is to verify the effect of burden of support for unmarried adult children on the depression of married women and the mediating effect of couple conflict in the process. To this end, 1,076 married women with baby boomer husbands and unmarried adult children were extracted based on the data from the 7th year of the Women and Family Panel (KLoWF) and analyzed by using a structural equation. Looking at the results of the analysis, first, the burden of supporting unmarried adult children had a positive(+) effect on the depression of married women, and also had a positive(+) effect on couple conflict. Second, it was found that couple conflict had a positive(+) effect on the depression of married women. Third, couple conflict was found to play a role as a partial mediator between the burden of supporting unmarried adult children and the feeling of depression. Based on the above findings, the study suggested the various programs to resolve couple conflicts and decrease the depression of married women.

• Journal of Appropriate Technology
• /
• v.5 no.2
• /
• pp.97-105
• /
• 2019

Most of the BoP (Base of the Pyramid) do not have the economic power to eat balanced nutrients. Therefore, the solution is to add essential nutrients to the food you eat. This method can improve nutrition without putting an economic burden on the BoP classes. The aim of the paper is to apply the strategic management process for analysing BoP solutions in nutrition improvement sector. This allows identification of critical aspects in developing BoP solutions. This includes reaching sustainability related objectives. Two cases (Ajinomoto, Grameen Danone) covering both products and services have been researched, allowing a contribution towards the applicability of strategic management in respective situations. In this study, we analyzed the case through the "Appropriate Technology 2.0" framework of Polak and Warwick (2014). In addition, we introduced the strategy of BoP business. Based on the results of this analysis, we analyzed the success factors of appropriate technology business in the emerging markets through the 4A model.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
• /
• v.7 no.12
• /
• pp.371-380
• /
• 2017

This paper aims to explore a comparative instructional effects among meaning-based communicative language teaching, input-enhanced FnF instruction and output-enhanced FnF instruction in order to optimize the teaching methods of target grammar and vocabulary. The experiment selected three homogeneous groups of 30 students in each group for the comparison: One comparative group with communicative language teaching, one input-enhanced FnF group and another output-enhanced FnF group. The result indicates that the input-enhanced group outperformed the comparative group in the grammar test with statistical significance and the output-enhanced group overweighted the comparative group in the vocabulary test. However, no significant statistical difference was found between the input-enhanced group and the output-enhanced group. The conclusion from the result could bear the following pedagogical implication: The general English education must use the eclectic method of adopting communicative language teaching with FnF of input-enhanced target grammar and output-enhanced target vocabulary to supplement the students with the basic vocabulary and grammar.