• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.11
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• pp.6412-6418
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• 2014

This paper performed a numerical study of an air-liquid ejector. An ejector is a fluid-transportation device that spouts high-pressure fluid from driving pipes using the kinetic energy of the spouted fluid and increases the pressure through the exchange of momentum with the surrounding gases of the lower pressure. The air-liquid ejector was investigated through steady three-dimensional multiphase CFD analysis using commercial software ANSYS-CFX 14.0. Water as the primary fluid is driven through the driving nozzle and air is ejected as the second gas instead of ozone in real applications. The difference in performance according to the shape of the diffuser of the ejector was examined. The results provide deep insight into the influence of various factors on the performance of the air-liquid ejector. The proposed numerical model will be very helpful for further design optimization of the air-liquid ejectors.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.8
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• pp.2766-2773
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• 2010

Science business park(SBP) has been formulated and developed for the purpose of economic development. In addition to the Daedeok Innopolis, cities of Daegu, Gwangju, and Sejong are considering making the SBP in now. Research Triangle Park(RTP) which was planned by the local government, industry, and academic leaders has been developed for 50 years and has planned the next strategy. This RTP experience is very precious to Korean cases and can be contribute to three cities and other regions. Key success factors of Korean SBP are as follows, research capability and talents, visionary local leadership and collaboration, creative business model, and quality of life.

• Journal of Korean Society of Environmental Engineers
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• v.37 no.6
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• pp.380-386
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• 2015

In this study, the spatial and temporal distribution of volatile organic compounds (VOCs) in an industrial shipbuilding complex was monitored, and the local characteristics estimated. The major VOC component measured at all of the sampling sites were almost the same as those found at an indoor painting facility, indicating that painting works conducted in the shipyards were a significant source of VOCs in the vicinity of shipbuilding areas. The main parameters affecting the VOCs distribution were the distance between the sampling site and painting work place, and the intensity of the painting works. A quite broad range of VOC concentrations were observed in all of the sampling sites, depending on the intensity of painting works in nearby areas suppressing the typical seasonal and temporal variation trends in VOCs observed in urban areas.

• Journal of environmental and Sanitary engineering
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• v.15 no.2
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• pp.95-101
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• 2000

High growth of economy and industrial development was produced every air pollutants, that is, SOx, NOx, dust, VOCs and malodorous gas was produced. Recently, volatile organic compounds(VOCs) was bring about very serious environmental problems. Ulsan petrochemical complex was densely a large scale of petrochemical plant. This study was carried out to select treatment equipment of VOCs produced from petrochemical plant, and has compared with Carbon filter, Regenerative thermal oxidation(RCO) and Flare stack for technical merit and demerit but also initial investment and operating cost.

• Journal of Korean Society on Water Environment
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• v.23 no.5
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• pp.766-775
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• 2007

The use of toxic chemicals was extended as the industry in Korea has grown dramatically during the last three decades. However, list of toxic substances and limit concentrations in the water environment are not consistent within management of ambient water, drinking water and industrial effluent. This article suggests the systematic framework to classify toxic substances in the water environment and deriving their effluent limits. The most important factor for decision-making to classify toxic substances is whether their concentrations in the water environment are higher than the reference concentrations, estimated by considering human health risk and ecological risk. Using a risk-based reference concentration, the ambient water quality criterion, it is possible to derive the regulatory limit concentrations of toxic substances in drinking water and in industrial effluent. The goal concentrations in the effluent, which guarantee the human and ecological safety, should be determined with scientific investigation, balancing environmental benefit and economical effect, considering availability of treatment technology and identifying characteristics of wastewater from different industries.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.465-469
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• 2008

수도권의 중요한 상수원인 팔당호 수질에 큰 영향을 주고 있는 경안천 유역의 오염배출량을 저감하기 위하여 많은 인공습지조성이 계획되었으나 이들의 위치선정의 적합성에 대한 분석이 부족한 실정이다. 또한 경안천은 상류에서 중류까지는 주변 농경지의 용수공급을 위해 많은 수중보가 설치되어 물의 흐름이 단절되어있어 수리적 요소에 인공요인으로 작용하고 있으며, 하류로 갈수록 하천이 곡선형태로 흐르고 하폭 또한 넓어져 자체적으로 유기물이 증가하기 좋은 환경을 가지고 있다. 본 연구에서는 유역의 자연적, 인공적 요소를 고려한 물리적 모델을 구축하고 각 오염원특성별 부하량 분석을 통한 속성정보를 반영하였으며 오염저감시설설치 시나리오의 타당성분석을 분석을 수행하였다. 연구과정을 좀더 상세히 살펴보면 첫째, 비점오염원의 주된 경로중 하나인 축산계부하량 저감을 위하여 지형적 인자를 고려한 인공습지조성 적지분석 결과를 HSPF모델에 반영하였다. 둘째, 기존 오염 총량제에서 수행해오던 오염부하량 산정방식을 통해 산정된 양을 유역단위로 재분배 하여 오염원 분포를 반영하였다. 주요 오염부하량인 축산계와 토지계의 오염부하량만을 적용하였으며 일부 오염원 항목들은 생략하거나 하수처리시설을 통해 처리되고 있는 것으로 모의하였다. 셋째, 각 시나리오별 시뮬레이션을 수행하여 경안천 인공습지조성가능성 및 수질개선 효과를 예측하였다. 기존의 점오염원 처리시설만으로는 하천에서의 목표수질을 만족시키는데 한계가 있기 때문에 점오염원 저감시설뿐 아니라 비점오염원 저감시설인 인공습지를 기존의 처리시설에 연계하여 시나리오를 구성하였다. 기존습지시설의 오염저감율은 각 시설들의 평균값을 적용하였으며 처리효율은 BOD, TN, TP 각각 40%, 25%, 12%로 적용하였다. 오염원분포를 고려한 모의결과 현재 인공습지 입지대상지역들 중 좀 더 효율적인 오염저감 효과를 보이는 지역이 분석되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1939-1943
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• 2008

저수지 수질은 유역의 점오염원 배출부하와 강우시 발생하는 비점오염부하 발생에 의한 유역유출수의 저수지 유입과 저수지내 상황 및 기상등에 많은 영향을 받는다. 이와같이 저수지 수질은 저수지 내외의 다양한 요인에 따라 그 특성을 달리함으로 수질관리를 위해서는 기상, 수리 수문, 수질, 지형, 오염원, 처리시설 등 많은 자료를 필요로 하게 된다. 따라서 각종자료의 입력, 수정 및 분석을 하는 자료관리시스템, 수질모의를 수행하는 모델시스템 그리고 분석결과를 표나 그래프로 표현하는 체계를 하나의 시스템으로 통합 구축하여 필요한 분석을 실시함으로서 여러 가지 대안에 대한 평가를 시각적으로 쉽게 할수 있게 되어 관리자는 보다 정확하고 신속하게 의사결정을 할 수 있게 된다. 본 논문에서는 UML(Unified Model Language)기반 하에서 Visual $C^{++}$ 언어를 사용하여 Class diagram, 화면명세, Database명세 등을 생성하는 체계적인 시스템을 구축하였으며, 수질모의를 위해 유역모델로 HSPF 모형을 선정하였고 저수지 모델로는 CE-QUAL-W2를 적용하였다. 구축된 시스템의 활용을 위해 유역관리 시나리오 4개(하폐수처리장 운영에 따른 수질변화모의, 점오염원 제거시 수질모의, 비점오염원 제거시 수질모의, 개발지 관리에 의한 수질모의)와 저수지관리 시나리오 4개(저수지 운영조건 변화에 따른 수질모의, 조류 차단막 설치에 의한 수질모의, 조류제거선 운영에 따른 수질모의, 빈도강우시 탁수관리 모의)를 적용하여 수질변화를 모의하였으며, 다양한 새로운 시나리오를 원활한 적용할수 있도록 설계하였다. 이상의 적용결과로 평가해 볼 때 본 시스템은 저수지 수질관리에 활용할 수 있는 효율적인 시스템으로 평가되었다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.6
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• pp.139-147
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• 2014

The ballast water may be discharged into another sea area with marine organisms, it caused problems to disturb the marine ecosystem. So, in order to remove these environmental risk factors, the IMO has mandated the installation of BWTS to the all ships. Our monitoring system diagnose and predict a failure of BWTS by analyzing the sensor information of BWTS collected from which the ships scattered in the ocean of several. This paper presents the design and implementation of communication modules for BWTS remote monitoring considering the satellite communication charge fee. In the our study, we implemented the safety and cost-saving communication modules by LabVIEW program. The collected sensor informations is encrypted and compressed by LabVIEW modules running on RIO. Then they will be transfer to the land server and will be decrypt to enable monitoring in the land server. For the verification, we build the test modules which can verify from collecting the sensor data to consuming them in the monitoring server. We carried out 20 times for the data pattern in all of case. So, we verified the excellent functionality and reliability through the experimental result.

• The Journal of the Convergence on Culture Technology
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• v.6 no.3
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• pp.217-224
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• 2020

The conditions of university education are also changing as society changes. In particular, the rapid decline in the school-age population heralds a change in the environment of university education. In this study, we would like to draw up educational issues that arise with changes in the educational environment, and propose the university's efforts to resolve them. For example, the challenges of change include expanding the scope of admission resources, providing substantial education, producing competent talent, and administrative and financial bases for implementing educational tasks. Based on this, it is necessary to understand the change in educational paradigm for all members to have a solid education, starting with opening university doors to adult learners. In addition, efforts to change need to be made in consideration of various categories and factors in order to strengthen the educational power of universities in relation to the administrative and financial foundations for implementing them.

• Journal of the Korean Wood Science and Technology
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• v.46 no.5
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• pp.577-596
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• 2018

ASEAN countries consist of vast coastal areas and thousands of islands that are vulnerable to the effects of climate change on sea level rise. It is believed that this will play an important role in reducing greenhouse gas emissions globally in order to minimize the damage suffered by ASEAN countries. To overcome this issue, biofuels have been used to minimize the impact on the environment by replacing fossil fuels and to reduce greenhouse gas emissions. In those cases of United States, Brazil and Europe, where biofuels are highly utilized, research, development and investment in this field have been actively conducted in the past. In ASEAN countries, however, it has not been a long time since the biofuel policies were established. To overcome this problem, we investigated the renewable fuel policy in the United States, Brazil and the European Union. Based on this, we suggested the utilization plan and prospect of biofuel policy in ASEAN countries.