• Asian Journal of Business Environment
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• v.10 no.4
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• pp.29-34
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• 2020

Purpose: Town of Woldia, a semi-arid region in the Northern Wollo region of Ethiopia, faces water supply shortage in general, though the town possesses a running stream of clean water throughout the year. This study is aimed at analyzing the possibility of using rainwater for water scarcity and non-potable water needs of the Woldia University. A careful study and analysis have been made to assess the feasibility of using rainwater in place of the tap water supply. Research design and methodology: This study was done inside the main campus of Woldia University located in Woldia town. The runoff water from the roof of buildings was studied, by the time of rainfall in the town. Also, the budget needed for implementing a rainwater harvesting system was calculated. Results: The findings of the study clearly indicates that the requirements of the water to use for flushing, cleaning, and washing toilets in the administrative buildings and classrooms can be satisfied by using rainwater as an alternative to tap water. Conclusion: Based on the results the study finds it is benefitable for the Woldia University to install the rainwater harvesting system at the earliest to solve the water problems prevailing in the current situation.

• Journal of Korean Society of Water and Wastewater
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• v.21 no.1
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• pp.65-73
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• 2007

To consider business-based requirements beyond the existing roles of water supply, water utilities need enough methodology to integrate lots of related issues and to introduce effective decision-makings. On these grounds, this study modeled and simulated water business system using system dynamics approach. It is expected that formalised model can describe the actual system structurally and statistically, help utilities to predict their business performance and make decisions to solve chronic issues. Moreover, the case study of Y city gave political measures objectively and practically.

• The Journal of the Korea Contents Association
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• v.15 no.3
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• pp.336-351
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• 2015

This paper aims at investigating feasibility of social enterprise approach to water poverty, especially access to safe drinking water issue. Now. over 780 millions of people have no improved access to safe drinking water, which result in various diseases and high mortality in people of developing countries. Recently there is more growing interest on BOP business, a market approach which utilize vitality, innovativeness and profit motives of private business to tackle social problem like poverty. Many BOP businesses have been conducted in the form of social enterprise. In the paper, firstly the severe problems of no improved access to clean and safe drinking water were explained. Secondly, the potential of BOP business to address these problems was explored. Thirdly, some actual cases of social enterprises which successfully run their business were introduced. Fourthly, some business models for social enterprise to want to come into water market were discussed. Finally based on these discussions, some recommendation for Korean companies and government were also suggested.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2016.10a
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• pp.183-183
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• 2016

• Journal of the Earthquake Engineering Society of Korea
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• v.18 no.6
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• pp.271-278
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• 2014

Seismic intensity deduced from instrumental data has been evaluated using the empirical relationship between intensity and peak ground acceleration (PGA) during an earthquake. The Japan Meteorological Agency (JMA) developed a seismic intensity meter, which can estimate the real-time seismic intensity from seismic motions observed at a local site to evaluate the damage during the earthquake more correctly. This paper proposes a practical application of the JMA intensity to dams during the 2013 earthquake in Yeongcheon, Korea. In the present paper, seismic intensity was estimated from the relationships between accelerations observed at Yeongcheon Dam. Estimated seismic intensities were in the range of 0 to 3, which was verified from the displacements of dams and the variation of the ground water level observed at Yeongcheon dam during the earthquake. The JMA intensity, which is determined by considering the frequency, duration of cyclic loading, etc., was 0 (zero) and there was no damage to Yeoncheon dam during the earthquake.

• Proceedings of the KIEE Conference
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• summer
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• pp.1507-1509
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• 2004

Many domestic organizations are pushing ahead with small hydropower business to develop a renewable energy. In addition each organization gradually spreads small hydropower business with searching the best site for it. And Kowaco (Korea Waters Resources Corporation) answers a purpose of the government policy to spread the wide use of a renewable energy. This study explains the researching programs for the best development sites for small hydropower generation with using water pipes managed and controled by Kowaco.

• Journal of Environmental Impact Assessment
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• v.20 no.3
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• pp.397-409
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• 2011

This study was carried out for improving the effectiveness of water resources development project through local resident opinions in the environmental impact assessment(EIA). The EIA reports of seven dams were examined. Four dams -Youngju Dam, Seongduck Dam, Buhang Dam and Hantangang Dam- which included many local opinions including 470 opinions of 341 local residents were selected to be analyzed. Local residents submitted their opinions in the six fields which are meteorological phenomena, water quality, land use, fauna and flora, noise and vibration, and residence, and the major opinions of those opinions came from the atmosphere environment field which is 32% of total opinions and social and economic field which is 38% of total opinions, respectively. In submerged area, opinions of the measure for migration and compensation were 91% and in non-submerged area, opinions of the measure for meteorological phenomena was 86%. Those percentages were maximum in each area. Opinions concerned meteorological phenomena were 86% and 53% in Youngju Dam and Seongduck Dam where area is surrounded by existing dam, but there was only 9% and 0% of opinions in Buhang Dam and Hantangang Dam where area is without existing dam nearby. The reformation methods which reflected the resident's opinions were suggested on EIA in dam development projects. First of all, reliability and objectivity of the field of meteorological phenoma should be enhanced by scientific prediction of the phenomenon days. Secondly, techniques reducing uncertainty of various water quality prediction models ought to be developed and effectiveness of the reduction strategies in environmental impact should be quantified. Finally, the draft of EIA report should involve the detailed plans of migration and compensation's procedures, criteria and measures to support.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.327-329
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• 2008

일반적으로 특정 지역에 특정 발전기만 전력을 공급할 때 이를 단독 계통이라고 한다. 선진국에서는 오지 혹은 섬 등에 이용하고 있으나 전력의 제한 송전을 하는 후진국에서는 일부 지역에 전원을 공급하기 위하여 소수력이 많이 이용된다. 이번 논문에서는 아프카니스탄 이스탈리프 단독 계통 발전기의 과속도 현상에 대한 원인을 검토하고 향후 이러한 단독 계통 개발시 참고자료로 활용코자 한다.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.941-942
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• 2006

The Analysis on AVR-MVR conversion trouble for Excitation System AVR-MVR conversion is a very important function to transfer AVR to MVR when the grid has abrupt changes or the control system has some problems. Therefore through studying on AVR-MVR transfer scheme, and problems which might happen when transferring, we would like to enhance the stability of generator and control system.

• Journal of Environmental Impact Assessment
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• v.20 no.1
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• pp.89-96
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• 2011

This study was carried out to assess the variations of water quality caused by the dam construction on the river. Six dams-Yongdam, Miryang, Hoengseong, Boryeong, Jangheung and Buan- constructed recently in Korea were selected for the study. Chemical oxygen demand(COD) was increased in the initial stage of water storage at dams compared to the lotic(river) environment, but after 3 years it was maintained lower and stabilized concentrations. Five dams except for Jangheung Dam were maintained Ia~Ib grade conditions under the water quality criteria of Korea. The concentrations of total nitrogen(T-N) were decreased under the lentic(reservoir) environment compared to the river status. Total phosphorus(T-P) was decreased 13~63% at the reservoir condition. We concluded that increase of COD concentration was due to the debris organic materials of the land, but temporary phenomenon. T-N and T-P concentrations were decreased at the lentic condition compared to the lotic.