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주관적/객관적 가중치를 이용한 한국 도서지역의 물이용 취약성 평가
구재욱,황태문,신용현,남숙현,김은주 한국수처리학회 2023 한국수처리학회지 Vol.31 No.4
In island areas without a water supply pipe, water use is limited to small reservoirs or groundwater. These small reservoirs depend on precipitation and are not always available due to changes in precipitation patterns. Island areas in Korea are susceptible to drought, and water supply restrictions and the transport of water from the mainland are necessary to relieve the impact of drought conditions. A method for assessing water use vulnerability that considers the unique characteristics of these islands is required to respond to water scarcity during times of drought. In developing a vulnerability assessment, we used the pressure-state-response (PSR) framework to establish indicators corresponding to pressure, state, and response. We employed objectively weighted decision-making using the entropy method to identify the indicators for each factor. To establish the weight reflecting the importance of each factor, we used subjective weighting according to the Delphi method. The water use vulnerability assessment method was developed by adding factors representing the groundwater and sea levels according to the characteristics of the islands. The results of this assessment of the water use vulnerability in island areas revealed the most vulnerable area and the water supply priority area. The method developed in this study reflects subjective opinions for water use in island areas and can be used to assess water use vulnerability by calculating the weights of specific indicators based on the differences of the alternatives. This method forms the basis for an approach to determining priority areas for transported water supply. .
구재욱,이상호,홍승관,김준하,Koo, Jae-Wuk,Lee, Sangho,Hong, Seungkwan,Kim, Joon Ha 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
Shale gas has the potential to significantly change the way of the world's energy use. However, there are increasing concerns on environmental problems, particularly with respect to water use and wastewater treatment. This paper highlights issues related to shale gas water management and technologies currently used to address them. It also presents perspectives of emerging technologies for the treatment of shale gas wastewater, including forward osmosis (FO) and membrane distillation (MD). 셰일가스는 전 세계의 에너지 사용방식을 크게 변화시킬 만한 잠재력을 가지고 있다. 그러나 셰일가스 생산과정에서의 물의 사용과 폐수의 처리와 관련된 환경문제에 대한 관심이 증가하고 있다. 이 논문은 셰일가스 용수관리와 관련된 이슈를 제시하고 이러한 이슈를 해결하기 위한 기존 기술들에 대한 내용을 소개하고 있다. 또한 본 논문은 정삼투와 막증류와 같이 셰일가스 폐수처리를 위한 새로운 기술의 전망에 대해서도 다루고 있다.
막증발법 공정에서 셰일가스 플랜트 용수 처리: 막 오염 효과
구재욱,황태문 한국수처리학회 2022 한국수처리학회지 Vol.30 No.4
The increase in shale gas production in recent years has resulted in environmental and water management challenges because the water utilized in hydraulic fracturing contains many pollutants. Therefore, the treatment of this wastewater has received significant attention. In the present study, the feasibility of membrane distillation for the treatment of wastewater from shale gas plants was examined. The results indicated that direct-contact membrane distillation (DCMD) is suitable for treating both low-range and high-range flowback water. Based on theoretical calculations and long-term experiments, DCMD was shown to achieve a recovery rate of over 70%. However, the flux abruptly decreased above this critical recovery rate due to membrane fouling. The examination of fouled membranes using scanning electron microscopy revealed that scale was the major source of fouling. In order to ensure that DCMD can become a reliable next-generation desalination technology, the membrane fouling mechanisms were investigated in more detail. This study confirmed that DCMD could be used to treat high-concentration wastewater, but membrane wetting occurred due to scale formation, oil, and grease. Moreover, oil and surfactants were identified as serious obstacles to the use of DCMD because they cause membrane wetting. .
구재욱,남숙현,심진우,김은주,최용준,황태문 대한상하수도학회 2016 상하수도학회지 Vol.30 No.6
Pressure retarded osmosis (PRO) processes can be implemented on a number of water types, using different technologies and achieving various power outcomes. In this study, Sewage facility effluent was used for feed solution of PRO and synthetic NaCl water for draw solution. This study was conducted to investigate effect of water quality of pretreatment on power density and flux decline in PRO process. The results show that organic and particulate foulants have to be removed for more stable operation. Flourescence technique with EEM enables to investigate the chemical properties of aquatic organic matter by extracting spectral information. Humic/fulvic matters and soluble microbial by-products were analyzed as the most affecting factors on the PRO performance. As a result of analyzing the whole system based on the energy consumption of the unit process, specific energy consumption(SEC) of the applicable technology for PRO pre-treatment should be about 0.2 kWh/m3 or less.
구재욱,김도훈 한국정보보호학회 2024 情報保護學會誌 Vol.34 No.1
본 연구에서는 퍼블릭 블록체인 기술을 적용하여 탈중앙화된 식별 정보(DID) 어플리케이션을 개발하였다. 기존의 컨소시엄 블록체인을 사용한 DID는 일부 참가자들 간의 신뢰를 기반으로 동작하여 특정 그룹의 중앙화된 통제 가능성으로 인해 보안 문제가 발생하는데, 이를 극복하기 위해 퍼블릭 블록체인을 도입하여 안전하고 투명한 디지털 식별 체계를 제시한다. 또한, 본 연구에서는 웹앱 형태의 DID 어플리케이션을 사용자 친화적이고 직관적인 디자인으로 구현하여 사용자들이 쉽게 식별 정보를 관리하고 교환할 수 있도록 하였다. 더불어 안전한 키 관리 및 전자 서명 기술을 적용하여 사용자들은 자신의 식별 정보를 완전히 통제할 수 있으며, 이를 통해 탈중앙화된 신뢰 모델을 체험할 수 있다.