U-City - 첨단도시개발을 위한 또 하나의 도전

이상훈,Lee, Sang-Hun 한국건설관리학회 2009 한국건설관리학회 논문집 Vol.10 No.1

유한요소법을 이용한 세미 파인-블랭킹 금형 해석에 관한 연구

이상훈,송기환,손창우,서형진,서태일,Lee, Sang-Hun,Song, Gi-Hwan,Son, Chang-Woo,Seo, Hyoung-Jin,Seo, Tae-Il 한국금형공학회 2016 한국금형공학회지 Vol.10 No.1

Metal sheet forming has been commonly used as the core technology in manufacturing parts of automobiles. It guarantees the highest production rate due to the process of mass production employing the press die. For precision of the product, the accuracy of the molds and its mechanic structures are considered as essential factors. One of these is fine blanking, which is utilized for the production of the metal sheet spring, with which clear sheer surfaces can be achieved in one operation from the materials. However, the current designs of press dies perform the forming analysis with the molds of rigid body, so they are focused on weight lightening by a rule of thumb. Therefore, this paper practice structural analysis about developing the semi fine-fine blanking technology. The semi fine-blanking can be run through the combination of the hydraulic cylinders and normal presses, so this paper analyze the amount of deformation according to the oil pressure. In addition, based on the plasticity of 50CrV4, the materials of the mold parts, the structural analysis and life analysis are proceeded, so they are expected to be useful as data for manufacturing the mold.

포럼탐방-광대역통합망(BcN) 포럼 소개

이상훈,Lee, Sang-Hun 한국정보통신기술협회 2006 TTA저널 Vol.107 No.-

UL 8750 LED Power 규격에 대한 개요 및 규격 인증을 위한 시험 방법 이해

이상훈,박성준,Lee, Sang-Hun,Park, Seong-Jun 한국조명전기설비학회 2011 조명.전기설비 Vol.25 No.4

재활용 현황파악을 위한 공공 자료별 국내 납 물질 흐름 상호 확인

이상훈,김정은,Lee, Sang-hun,Kim, Jungeun 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.3

Supply deficit of lead commodities and environmental pollution can be simultaneously resolved through the recovery and recycling of waste lead. The recent recovery of lead through recycling of the lead battery waste is a positive development. To maximize the effect of lead recovery and recycling in the future, the updated status of the lead material flow should be recognized. However, such an analysis at the preliminary stages may be cumbersome owing to the complexity and diversity of emission sources and material streams. At this stage, a preliminary screening by domestic lead flow using public information should be feasible. Therefore, in this study, using the data from the UN Comtrade and domestic PRTR (Pollutant Release and Transfer Register) databases, the amounts of lead import, emission, and transfer were identified and cross-checked with the domestic lead flow described in the National Material Flow Analysis database. The lead flow for major categories such as waste lead-acid batteries showed a rough consistency between the databases.

폐기물 수출입 흐름 변화가 폐기물 관리에 미치는 영향

이상훈,Lee, Sang-hun 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.3

This study reviewed the examples on analyses of the potential impacts to waste management, due to the recent trends of waste trade regulation, and summarized an analysis strategy of the impacts. As a result, a desirable analysis may begin with reasonable estimation of recent waste amounts and flows, and reasonable prediction of the future trends of waste amounts. Then, it is effective to list various key factors and derive future scenarios of the impacts, as well as employ the traditional viewpoints focusing on waste material flow or environmental regulations. The applicable analyses for each scenario can be largely divided into qualitative and quantitative methods. Due to a high uncertainty in the recent international situations with entailing possible innovative economic changes, qualitative methods may be considered in advance, and then quantitative techniques may be utilized to predict gradual changes at relieved uncertainty of the situations. Based on this review so far, proper methodology and procedures for the impact analysis were suggested on recent waste trade conditions in Korea. Given existence of the recent uncertainties such as the health and economic crises, the analysis preferably focused on deriving strategic scenarios with respect to various aspects, and suggested analysis methods applicable to each scenario.

공공 자료를 활용한 산업폐기물내 유해성 유가금속 회수관련 초기 현황조사 방안

이상훈,Lee, Sang-hun 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.2

우리나라는 제조업 중심 국가로서 다양한 분야에 많은 양의 금속이 사용되나, 이들 금속이 대부분 수입에 의존하고 있다. 상당수의 금속은 전세계적으로 제한된 부존량 및 생산량에 비해 소비량이 증가하는 실정이다. 어떤 금속들은 부존 및 생산국가가 편재되어 있는 경우가 종종 있어 향후 공급의 불안정성이 우려된다. 또한 이러한 금속이 유해성을 띄고 있을 경우 환경적 측면에서도 문제가 된다. 이를 해결하기 위해 사업장 폐기물내 유해성 유가금속 회수 및 재활용을 통해 공급을 안정화시키고 환경오염을 예방할 수 있으나, 유가 금속의 종류 및 국내 배출업체와 배출폐기물 종류가 매우 많아 초기에 관련 현황파악이 번거롭다. 따라서, 본 연구에서는 공공기관 공개자료를 통해 향후 국내산업에 중요한 유해성 유가금속 선정결과를 소개하고, 국내 화학물질 배출·이동량 정보 등을 이용하여 이러한 금속(니켈, 코발트, 망간 등)를 함유 폐기물을 배출하는 업체들을 보다 용이하게 초기 현황파악 하는 방안을 순서도 형식으로 제시하였다.

저품위 광석 또는 광미내 금 침출기술 현황

이상훈,Lee, Sang-hun 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.2

Recently, the gold leaching technologies draw much interest to recover gold from low grade ores. Current leaching processes mostly use cyanide as the leaching agent, due to its high leaching efficiencies and cost-effectiveness. However, use of cyanide is severely problematic, because of toxicity and thereby environmental risks, and requires strict regulations and environmental management. Especially, this issue becomes further apparent when cyanide should be applied for dump or heap leaching for low cost gold recovery along with recent trends. To resolve this issue, the alternative leaching processes using thiosulfate or halogen compounds, instead of cyanide, have been studied and developed but there have been lots of difficulties toward commercialization, and therefore further research should be conducted. The commercialization of dump or heap bioleaching technologies should be urgently required for effective direct biogenic gold recovery from low grade ores or tailings without use of cyanide.

국내 플라스틱 리싸이클링 현황

이상훈,Lee, Sang-hun 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.6

최근 국내의 폐플라스틱 발생량 증가와 폐플라스틱 처분의 어려움 그리고 미세플라스틱 유해성 등으로 플라스틱 폐기물 문제가 심각하게 인식되고 있다. 이러한 문제를 해결하기 위해 일차적으로 플라스틱 사용량을 규제하는 방안이 있는데 이 경우 해당 품목별 규제근거를 명확히 하는 것이 중요하다. 또 다른 문제로 국내 재활용업체 규모의 영세성을 들 수 있는데 영세업체의 부진한 기술개발역량으로 재활용의 수율과 관련 품목의 가치가 하락하여 소비자들의 인식에 악영향을 끼치게 된다. 이러한 점은 재활용에 대한 기술적 진보와 함께 이를 지원하는 정부의 노력과 제도적 개선이 뒷받침되어야 할 것이다. 재활용 기술개발은 제품이나 포장재의 설계 단계에서부터 환경친화성과 재활용성을 고려해야 하는데 이는 국가적 지원과 지원과 관련 제도의 개선이 요구된다. 또한 선진정책 예를 들면 유럽연합의 정책을 참조하여 재활용 산업을 새로운 투자/고용기회 창출기회로 인식하고 필요하다면 규제에 대한 설득과 근거를 LC A 같은 평가과정을 통해 명확히 객관화해야 한다. 더불어 재활용품내 함유되어 있을지도 모를 유해화학물질의 규명 및 제거를 통해 재활용의 가치를 향상시켜 나가야 할 것이다.

질소/인 회수를 위한 Struvite 생성 메커니즘

이상훈,Lee, Sang-hun 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.3

The recovery of struvite using nitrogen and phosphorus in wastewaters is useful for prevention of eutrophication and use as fertilizer, but there are theoretical and technical issues to be resolved. Through the detailed literature review, this study discusses the possible reasonable prediction of struvite formation reaction by setting a feasible reaction equation with some theoretical considerations. In a technical aspect, the purity of struvite in solid precipitates can be promoted by excluding Ca in an effective way. As for the struvite reaction prediction issue, selection of proper equilibrium reaction as well as its reaction equilibrium coefficient is significant in the neutral and basic pH regions. The equilibrium reaction agrees well with the experimental batch test results. Considering the charge balance of the ions, the pH drop along struvite formation in a diluted solution can be predicted. Also, improvement of struvite purity through elimination of Ca can be expected by providing a highly concentrated ${NH_4}^+-N$ relative to ${HPO_4}^{2-}-P$ because ${NH_4}^+$ can enhance the thermodynamic driving force toward favorable struvite formation. Even though the phosphate reacts rapidly with Ca to form a solid precipitate, the thermodynamic driving force due to the high ${NH_4}^+$ activity can dissociate the phosphate-calcium precipitates and produce struvite.