Application of Biomass Hydrolysates from Aronia Juice Processing Residue for Bioethanol Fermentation by Saccharomyces cerevisiae

Jeongho LEE,Seunghee KIM,Kang Hyun LEE,Ye Won JANG,Hah Young YOO 한국생물공학회 2020 한국생물공학회 학술대회 Vol.2020 No.10

팔당호 상수원 수질보전을 위한 비용분담 모형

장정호,김성태 淸州大學校 産業經營硏究所 2003 産業經營硏究 Vol.26 No.2

Joint Pilot Studies between Korea and Mongolia on Assessment of Environmental Management System in Gold Mining Industry of Mongolia (II)

( Jeongho Lee ),( Seong-taek Yun ),( Young-joon Lee ),( Jaeyong Choi ),( Yong Ha Park ),( Mendbayar Badarch ),( Erdene-ochir Badarch ),( Jang-soon Kwon ),( Kyoung-ho Kim ) 한국환경연구원 2005 수시연구보고서 Vol.2005 No.-

2004년, 몽골 금광산업 환경관리시스템 수립을 위한 예비 연구가 수행되었다. 당시 연구에서는, 환경관리시스템에 관한 기본 원리가 금광산의 예비 탐사 계획, 광산 공사, 운영, 폐광 및 사후 모니터링과 유지관리에 이르는 개발계획 전 기간에 걸쳐서 종합적으로 적용되어야 하는 것이 제안되었다. 2005년에는 이에 대한 연속 연구로서, 상세한 현지 조사 및 한-몽골간 공동 워크샵이 실시되었으며, 이를 통해 몽골 금광지역 인근의 환경오염 현황 구체화, 국내 폐광산 지역의 사례를 이용한 광산지역 일대 오염 토양에 대한 복원 정책 제시, 몽골 금광지역 일대의 육수 생태계 및 지형 개변 복원 계획과 그에 대한 최상의 환경관리시스템이 제안되었다. 현지 야외 조사에 대해서는 2005년 5월 사금광산 지역 인근 Tuul River와 Orkhon River의 하천수 시료 채취 및 현장 수질 측정, 실내 정밀 화학 분석이 수행되었다. 2005년 7월에는 몽골 울란바토르에서 한-몽골 간 공동 워크샵이 개최되어, 금광산업 환경관리시스템 평가에 관한 총 9건의 연구 결과가 발표되었다. 본 보고서는 상기의 연구결과를 기초로 하여, 몽골 사금광산 일대의 환경오염 현황(특히 하천 수질) 파악, 몽골 광업활동과 연관이 있는 토양오염 문제 해결을 위한 정책 및 기술적 접근, 최적의 환경관리시스템 수립을 통한 환경보호 및 성공적인 광산개발계획 수립에 초점이 맞추어져 있다. 몽골 금속광산 부근 하천 유역의 수질 및 수문학적 특징을 조사하기 위해 총 21개소의 지점에서 105개의 하천수 시료가 채취, 분석되었다. 그 결과 다음의 네 가지 결론을 도출할 수 있었다. 1. 연구지역의 반건조 기후 특징으로 인해, 하천수 시료채취 기간 동안의 하천수 중 유출은 지하수 기저유출에 의한 것임을 알 수 있었다. 2. 연구지역 하천수는 상당히 강한 알칼리수의 특징을 보이는 데, 이는 탄산염 광물의 용해, 하천수 내 서식하는 조류의 생물학적 활동, 하천수로부터의 이산화탄소 배출 등이 그 원인이다. 3. 하천수 내의 부유고형물질은 연구지역 하천 수질 악화의 주요 원인이며, 이는 굴곡이 심한 하천 수계 자체의 유하 특성, 목축 활동, 농업 및 광업과 같은 인간 활동에 의한 결과이다. 4. 인간 및 농업 활동은 하천수계 수질 교란의 직접적 원인이며, 하천내 화학성분 증가를 야기한다. 현재까지 해당 지역에서 광업 활동에 의한 하천수질의 심각한 오염은 발견되지 않았다. 그러나, 하천수 자체의 pH, 탁도 및 황산염의 농도가 매우 심각한 수준이어서, 음용수로의 사용은 불가하다. 더욱이, 사금광산 근처의 하천 제방이 지속적으로 붕괴되고 있는데, 이는 사금 채취를 위한 대규모의 굴착 및 불법 사금 채취자에 의한 일대 지형 교란이 주요 원인이다. 따라서, 이들 광산활동 지역 일대에 대한 지속적인 수질 모니터링이 요구된다. 폐금속 광산의 환경관리는, 토양오염 방지를 우선적으로 수행하는 것이 자연자원 보전 측면에서 가장 우선된 것이다. 이는 최상의 폐광관리 실무, 토지이용계획, 폐기물 최소화, 자원 보전을 위한 인센티브 제공 프로그램 등을 실시함으로서 달성될 수 있으며, 이와 같은 정책적 접근은 몽골 금광산업에 충분히 적용 가능할 것으로 사료된다. 현재 광산활동이 국가 산업 및 경제적으로 중요한 위치를 점유하고 있는 선진국의 사례를 분석하기 위하여, 호주의 광산업 환경관리시스템에 대한 두 가지 체계(광산승인체계 및 광업, 복원, 그리고 환경관리에 대한 체계)를 대표적인 사례로 분석하였다. 몽골 사금광산에 대한 최적의 환경관리시스템 개발을 위한 광권의 승인부터 광산 운영, 폐광에 이르는 광산 개발의 모든 단계에 대하여 환경친화적 관리체계를 제안하였다. 환경 보전을 위한 성공적인 광산 개발 계획은 광산활동시 발생하는 여러 요소에 대해 설계 및 레이아웃에 신중히 적용, 채굴기간 전반에 결쳐 발생할 수 있는 각종 환경적 악영향을 최소화 또는 제거하는 데 그 목적이 있다. In 2004, a preliminary study for establishing environmental management systems (EMSs) of gold mining industry in Mongolia was performed. The results showed that in the mining industry, EMS principles must also be integrated through all phases of mine development from preexploration planning, through construction, operation, closure and postmining monitoring and maintenance. Detailed field investigation and a joint workshop between Korea and Mongolia were carried out to quantitatively specify the status of environmental pollution near gold mining area in Mongolia in 2005. Samplings of river water and in-situ water quality measurements at Tuul River and Orkhon River were performed on May 2005. On July, 2005, a joint workshop between Korea and Mongolia was held in Ulaanbaatar, Mongolia, and a total of 9 research topics were presented with regard to the assessment of EMS in gold mining industry of Mongolia, which includes the remediation policies of contaminated soil in mining area based on case studies of abandoned mine sites in Korea and the best environmental management system and rehabilitation plan of the disturbed lands and riparian ecosystem near gold mining areas of Mongolia. This report, a compilation of knowledge from the field investigation and workshop between Korea and Mongolia, is mainly focused on the assessment of pollution status near the placer gold mining area (especially the water quality status), political and technical approaches to reduce the environmental problems of soils related to mining activities and its application in Mongolia. Finally, it suggests how to develop successful mine planning with the environment in mind, to establish the best EMS in gold mining of Mongolia, including detailed mitigation measures for both disturbed lands and riparian ecosystem. 105 water samples of Tuul River and Orkhon River were collected from semi-arid, central Mongolia to investigate the water quality and hydrological characteristics in the watershed near metallic deposits. The results of the hydrochemical analysis of rivers near the metallic mine areas are as follows: 1. Groundwater baseflow was the dominant runoff for the sampling periods due to semi-arid climatic feature in the study area. 2. Strong alkaline property of the river water is characteristic of dissolved carbonate minerals, algal activity and CO2 degassing. 3. Suspended solid particles resulting from the erosion caused serious problem in water quality near the study area. 4. Anthropogenic and agricultural activities are major disturbances in river system, resulting in acceleration of chemical constituents in river. Up until now, any serious pollution problems of river water caused by metallic mining activities (including gold) has not been observed. It must be detailed that these river waters should not be used for human drinking because of high values of pH and turbidity, and of sulfate contents locally. Moreover, the river bank area near the placer gold mines is being devastated with a fast rate by dredging soils with great scale for gold mining and illegal mining activities. The land devastation will continuously add soil materials to the river. The possibility of turbidity decrease is unlikely. Effluent of sewage without any treatment is also a concern. Therefore, continuous monitoring of the river water quality is necessary for the metallic mining area in Mongolia. In case of environmental management in abandoned metal mine area, prevention of soil contamination in the first place is the best way to protect natural resources. This can be accomplished through best management practices, land use planning, waste minimization, and programs that provide incentives for protecting resources. Also, more proactive attitude in managing the potential for soil contamination should be considered. In order to develop a good EMS for mining, especially for placer gold mining in Mongolia, substantial processes to environmentally manage all phases of mine development from approval and planning through operation to closure are necessary. Two major processes based on the best examples from Australia’s case studies are Mining Approval Process (MAP) and Mining, Rehabilitation and Environmental Management Process (MREMP). Successful mine planning for environment protection can avoid or minimize potentially adverse environmental impacts over the life of the mine and into the future by carefully considering the layout and design of the various components of a mine. As such, an establishment of a comprehensive EMS of placer gold mining in Mongolia needs to be essential.

Off-road 차량용 디젤엔진의 NOx 저감을 위한 EGR 시스템 적용에 관한 연구

강정호(Jeongho Kang),남대우(Daewoo-Nam),정건우(Gunwoo Jeong),조규백(Kyubak Cho),장용수(Youngsoo Jang),김문형(Munhyung Kim),박상호(Sangho Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5

In order to decrease NOx emission, the EGR system was applied on the off-road vehicle diesel engine. First of all, the primary map of EGR rate was formed by testing EGR in various engine driving conditions, and the engine performance and the NOx reduction was investigated. As the results of experiments, in the case of applying HPL EGR system on diesel engine used WGT, it is shown that the operating region of EGR is effective in low or middle load due to changing the differential pressure between turbocharger inlet and intake manifold. Increased EGR rate, NOx emission decrease according to increasing EGR rate, but THC shows the increasing tendency because of the increased fuel mass to compensate for the deteriorated power by EGR. Also, the temperature in intake and EGR system is raised highly by increasing the recirculated exhaust gas. From above results, the operating region of EGR is limited. However, NOx emission entirely decrease about 20~40% by applying EGR. So, if using the appropiate EGR rate for various engine driving condition, it is expected that NOx reduction is improved more and more.

High Directive Circular Polarized Metasurface Antenna combined with a Negative Resonance Radiating Structure for Radar Development

Kyeongnam Jang(장경남),Sungtek Kahng(강승택),Jinil Lee(이진일),Jinsu Jeon(전진수),Jeongho Ju(주정호),Hosub Lee(이호섭) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.10

설명가능한 인공지능을 활용한 합성곱 신경망 모델의 원 이미지 분류 강건도 분석

박정호(JeongHo Park),장혁순(HyukSoon Jang),조겨리(Kyuri Jo) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6

한국 증시에서 자사주 매입과 투자주체별 수급 동향

황정호(Jeongho Hwang),장범식(Beomsik Jang),김수현(Soohyun Kim) 대한경영학회 2017 大韓經營學會誌 Vol.30 No.8

이중관 열교환기를 적용한 차량용 냉난방 시스템 성능예측에 관한 연구

이정호(JeongHo Lee),조용석(Yong-Seok Cho),김광연(Kwangyeon Kim),장길상(Kilsnag Jang),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

In recent years, many automotive companies and researchers say that fuel consumption is one of the most important factor to evaluate cars, because of the depletion of fossil fuel like petroleum. From the this viewpoint, we focus on the air conditioning system to reduce the fuel consumption. Also, we apply the double pipe heat exchanger in the air conditioning system to improve the cooling performance and reduce fuel consumption. So we have to improve the cooling performance of the cars cooling system. This study is that to improve cars cooling system performance prediction using 1-D simulation.

수용가용 전력저장시스템의 경제성분석에 관한 연구

김정호(Jeongho Kim),장준오(Junoh Jang) 한국신재생에너지학회 2014 신재생에너지 Vol.10 No.3

A Study of Soil Moisture Retention Relation using Weather Radar Image Data

Choi, Jeongho,Han, Myoungsun,Lim, Sanghun,Kim, Donggu,Jang, Bong-joo Korea Multimedia Society 2018 The journal of multimedia information system Vol.5 No.4

Potential maximum soil moisture retention (S) is a dominant parameter in the Soil Conservation Service (SCS; now called the USDA Natural Resources Conservation Service (NRCS)) runoff Curve Number (CN) method commonly used in hydrologic modeling for event-based flood forecasting (SCS, 1985). Physically, S represents the depth [L] soil could store water through infiltration. The depth of soil moisture retention will vary depending on infiltration from previous rainfall events; an adjustment is usually made using a factor for Antecedent Moisture Conditions (AMCs). Application of the method for continuous simulation of multiple storms has typically involved updating the AMC and S. However, these studies have focused on a time step where S is allowed to vary at daily or longer time scales. While useful for hydrologic events that span multiple days, this temporal resolution is too coarse for short-term applications such as flash flood events. In this study, an approach for deriving a time-variable potential maximum soil moisture retention curve (S-curve) at hourly time-scales is presented. The methodology is applied to the Napa River basin, California. Rainfall events from 2011 to 2012 are used for estimating the event-based S. As a result, we derive an S-curve which is classified into three sections depending on the recovery rate of S for soil moisture conditions ranging from 1) dry, 2) transitional from dry to wet, and 3) wet. The first section is described as gradually increasing recovering S (0.97 mm/hr or 23.28 mm/day), the second section is described as steeply recovering S (2.11 mm/hr or 50.64 mm/day) and the third section is described as gradually decreasing recovery (0.34 mm/hr or 8.16 mm/day). Using the S-curve, we can estimate the hourly change of soil moisture content according to the time duration after rainfall cessation, which is then used to estimate direct runoff for a continuous simulation for flood forecasting.