廢電子스크랩에서 Thiobacillus ferrooxidans를 이용한 Cu, Al, Zn, Ni, Co, Sn 및 Pb의 浸出

안재우,김명운,정진기,이재천,김동진,안종관,Ahn, Jae-Woo,Kim, Myeong-Woon,Jeong, Jin-Ki,Lee, Jae-Chun,Kim, Dong-Gin,Ahn, Jong-Gwan 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.1

폐전자스크랩으로부터 미생물 침출법에 의해 유가금속을 회수하기 위한 기초 연구로 Thiobacillus ferrooxidans를 이용하여 Cu, Zn, Al, Co, Ni, Sn 및 Pb의 침출 거동을 조사하였다. 예비실험으로 각 금속의 침출 거동을 조사하기 위해 먼저 폐전자스크랩 대신 각 금속분말을 이용하여 침출 실험을 실시하였는데, 금속분말의 양이 증가함에 따라 츰출율을 감소하는 경향을 보였으며 각각의 금속분말의 농도가 5 g/L이하에서 Cu, Co 및 Zn의 경우 85%이상의 침출율을 나타내었다. 한편 폐전자스크랩을 이용한 침출실험 결과 고액농도가 100 g/L에서 Cu, Co의 경우는 90%이상의 침출율을 보이고 있으나 Al, Zn 및 Ni의 경우는 40%이하의 침출율을 나타내었다. Pb의 경우는 PbSO$_4$ 형태로 Sn의 경우는 SnO 형태로 침전되어 침출액중으로는 거의 용출되지 않았다. In order to recover valuable metals from the waste electronic scrap, bioleaching of Cu, Zn, Al, Co, Ni, Sn and Pb was carried out using Thiobacillus ferrooxidans as a leaching microorganism in a shaking flask. In a preliminary study, to obtain the data on the leaching of Cu, Zn, Al, Co and Ni, the metal leaching was accomplished using metal powers instead of electronic scrap. The leaching percentaga of Cu, Zn, Co, Al and Ni powers was reduced with the increase of metal power concentration in solution. Below the metal concentration of 0.5 g/L, more than 85% of Cu, Co and Zn powers was leached out. At the electronic scrap concentration of 100 g/L, Thiobacillus ferrooxidans were able to leach more than 90% of the available Cu and Co while Al, Zn and Ni were able to leach less than 40%. Pb and Sn were not detected in the leachate. Pb was precipitated as PbSO$_4$, whereas Sn precipitated probably as SnO.

습식공정에 의한 폐리튬이온전지(LIB) 재활용 기술 현황 및 전망

안재우,조연철 한국자원리싸이클링학회 2023 資源 리싸이클링 Vol.32 No.4

Recently, d ue t o the rapid growth o f the l ithium-ion b attery(LIB) industry a nd t he s ignif icant increase i n waste L IB generation, the LIB recycling business has garnered global attention. The recycling of waste LIBs holds paramount importance as it facilitates resource circulation by reusing precious and valuable metals like Mn, Co, Ni, and Li contained within batteries, thereby preventing environmental pollution. In this study, we aim to introduce a technology that utilizes a hydrometallurgical process to separate and recover Mn, Co, Ni, Li, and other materials from the black mass generated after pretreating waste LIBs. Specifically, we will analyze instances of solvent extraction technology application, which serves as the core technology in the separation process. We will elucidate efficient process design methods and provide an overview of potential future eco-friendly technologies poised to capture attention.

New Record of Two Derbesia Species (Chlorophyta) in Korea

안재우,강필준,남기완 한국환경생물학회 2018 환경생물 : 환경생물학회지 Vol.36 No.2

Two siphonous green algae were collected from the eastern coast of Korea. These species share the typical features of Derbesia sporophytes, such as erect and prostrate siphonous filaments and the presence of basal septum in lateral branches. One is characterized by the combined features of a relatively small tufted sporophytic thalli arising from a rhizoidal base, subdichotomously branched filaments with a basal septum and one pyrenoid per subspherical to lenticular chloroplast. The other shows a larger sporophytic thallus, sparsely subdichotomously branched filaments with a basal septum and one pyrenoid per spherical chloroplast. In a phylogenetic tree based on rbcL sequence, the two above-mentioned Korean algae nest in the same clades as Derbesia minima and D. indica, respectively. The genetic distance between the sequences within the clades was 0.5-0.8%, which is considered to be included in the intra-specific range for the genus. These two siphonous Korean algae are identified as D. minima and D. indica, respectively, based on the morphological and molecular analyses. These species are newly recorded in the Korean marine algal flora herein.

Tessellation-independent Approximation of Normal Vectors

안재우,김응순,Ahn, Jaewoo,Kim, Woongsoon Korea Computer Graphics Society 1998 컴퓨터그래픽스학회논문지 Vol.4 No.2

When rendering polyhedral models, normal vectors at polygon vertices are necessary for smooth shading. The most commonly used technique of approximating a vertex normal vector by averaging normal vectors of faces around the vertex yields, however, different results on different tessellations Further, continuous deformation of models may cause abrupt discontinuous changes in normal vector directions. In this paper, a variation of the above technique is proposed to avoid these problems. Specifically, it uses a weighted average of normal vectors of faces around the vertex, where the weight of a face being the angular span of the two edges incident on the vertex. 다면체를 부드럽게 렌더링하기 위해서는 각 꼭지점에서의 법선 벡터가 필요하다. 기장 흔히 쓰는 법선 벡터 계산 방법은 꼭지점 주변 면들의 법선 벡터들을 평균하는 것인데, 이 방법은 면들이 어떻게 분할 되어 있는지에 영향을 받으며, 따라서 비록 모델을 연속되게 변형하더라도 면 분할을 행하고 나면 법선 벡터들이 연속되지 않게 변할 수 있다. 본 논문에서는 이러한 문제점들을 해결하기 위하여 기존의 방법을 약간 변형한 법선 벡터 계산 방법을 제시한다. 이 방법에서는 꼭지점 주변 면들의 법선 벡터를 가중합하여 구하는데, 한 면의 가중치는 꼭지점에 걸쳐있는 두 모서리가 이루는 각으로 정한다.

PCB 질산에칭액으로부터 질산과 유가금속의 회수

安在우,安鐘寬,李晩承 대한금속·재료학회 2002 대한금속·재료학회지 Vol.40 No.1

The Non-Eco-Friendly Drive : Understanding South Korea’s Post-Dieselgate Volkswagen Sales

안재우 한국생태환경사학회 2016 생태환경과역사 Vol.- No.2

This study is an observation on the unusual post-dieselgate Volkswagen sales in South Korea, through the magnifying glasses of the humanities and social sciences. An analysis on the causality behind the country’s general utility function with regard to Volkswagen’s automobiles has been conducted by applying the theories of Pierre Bourdieu, Ivan Illich and Edward Said.

2D 콘텐츠의 3D 입체 콘텐츠로의 변환 기법

안재우,고민수,유지상 에스케이텔레콤 (주) 2011 Telecommunications Review Vol.21 No.4

본 논문에서는 3D 입체영상 생성 기법에 대한 기본 원리를 설명하고 기존에 제안되었던 다양한 기법들을 소개하고자 한다. 또한 성능이 우수한 변환 기술을 새로이 제안한다. 3D 입체영상 생성 기술은 지난 20년간 꾸준히 연구 개발이 진행되어온 분야로 최근 3DTV 보급과 더불어 3D 콘텐츠의 수요 증가와 함께 관심을 받는 분야이다. 본 논문에서는 영상이나 동영상 등 2D 콘텐츠에서 좌, 우 스테레오 3D 콘텐츠 변환 기법과 좌우 스테레오 콘텐츠로부터 다수의가상 시점(다시점) 콘텐츠를 생성하는 IVR 기법을 3D 콘텐츠 변환 기법에 포함하였다. 좌, 우 스테레오 영상 생성시발생하는 가려짐 영역을 보상하기 위하여 심카빙(seam carving) 기법을 이용하여 에너지 패턴을 구하고 이를 이용하는 새로운 기법을 제안한다. 또한 다시점 영상 생성시 발생하는 공통 홀(common hole)을 보상하기 위하여 나선형 가중 평균 기법(spiral weighted average method)도 제안한다. 심카빙 기법은 에너지 변화가 가장 작은 패턴을 찾아가려짐 영역 보상에 해당 영역을 이용하여 보상된 영역의 자연스러움을 최대로 할 수 있다는 장점이 있다. 나선형 가중 평균 기법도 공통 홀 주변 화소의 깊이 정보 차이값과 거리의 가중치를 이용하여 가장 근사한 화소의 색상값으로 보상을 하기 때문에 객체 정보를 반영할 수 있다는 장점이 있다. 실험 결과를 통해 제안하는 기법이 기존 기법들 보다 성능이 우수하다는 것을 보였다.

Di-n-Hexyl Sulfide 함유 지지액막을 통한 팔라듐의 투과 특성

안재우,정진기,이재천 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9

The transport of palladium through supported liquid membranes from hydrochloric acid solution has been investigated. Di-n-Hexyl Sulfide(DHS) has been stuided as a mobile carrier for the facilitated transport of Pd(Ⅱ) and kerosene as a diluent. Ammonium hydroxide solution has been employed as a stripping agents. The transport behavior of Pd(Ⅱ) was studied at various factors such as concentration of hydrochloric acid in feed solution, ammonium hydroxide in stripping solution, DHS in membrane phase, palladium in feed solution and the effect of stirring speed. The separation of palladium from palladium-platinum mixed solutions has also been investigated.

염산산성(鹽酸酸性) 용액(溶液)중에서 알루미늄에 의한 주석(朱錫)의 치환반응(置換反應)

안재우,소순섭,Ahn, Jae-Woo,So, Sun-Seob 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.2

폐전자스크랩, 함주석 폐액 등에서 주석 성분을 회수하기 위한 기초 연구로 주석이 함유된 염산용액에서 알루미늄 분말을 이용한 치환반응에 대한 연구를 실시하였다. 주석이온의 치환 반응에 미칠 수 있는 용액의 pH, 알루미늄 분말 첨가량, 반응온도, 반응시간, 염소이온($Cl^-$) 농도, 불순물 농도 둥에 대해 고찰하였다. 치환실험 결과 알루미늄 분말의 첨가량. 반응온도, pH 및 염소이온 농도가 증가함에 따라 주석이거 치환속도가 증가함을 알 수 있었다. 이들 결과로부터 알루미늄 금속분말을 이용한 금속 주석의 치환 및 회수에 관한 최적 조건을 제시하였다. A study on the cementation for the recovery of tin with aluminium in the hydrochloric acid solution was carried out. Parameters, such as aluminium metal equivalent, pH, reaction time, reaction temperature and the concentration of chloride ions were investigated. The experimental results showed that the cementation rate of Sn(II) ions increased with increase of the addition amount of aluminium powders, temperature, pH and the concentration of chloride ions in hydrochloric acid solution. From the results, the optinum conditions for recovery of metallic tin by cementation with aluminium metal powders were proposed.

소아 및 성인 천식 유병률 파악을 위한 델파이법을 활용한 표준조사서 개발

안재우,이경석,김진택,양현종,조유숙,장광천,송우정,권혁수,윤종서,한만용 대한 소아알레르기 호흡기학회 2018 Allergy Asthma & Respiratory Disease Vol.6 No.1

Purpose: Recently, the prevalence and disease burden of asthma have increased. Thus, the need for early diagnosis and appropriate management of asthma is emerging. However, it is difficult to identify the diagnosis, symptoms and the prevalence of asthma due to lack of reliable investigating items. The purpose of this study was to develop a standardized survey format in order to assess the prevalence of asthma in Koreans. Methods: We investigated surveys and related information that are utilized to assess asthma diagnosis and prevalence by systematic review. After that, Delphi survey was conducted on 44 Korean allergists in order to develop a standardized survey in Korea. The process consisted of 3 serial rounds across 3 age groups. Each subsequent round narrowed investigating items for the decision of standard set about asthma prevalence, current asthma, and asthma aggravation. Results: Lifetime asthma was defined as “ever doctor-diagnosed asthma” in all age groups. Current asthma was defined as “treatment for asthma during the past 12 months” in all age groups, and “doctor-diagnosed asthma during the past 12 months” was added on the ≥5-year-old and adult groups. “Wheezing ever” was defined as “wheezing at any time in the past,” and current wheeze was defined as “wheezing in the last 12 months.” Asthma aggravation was defined as “visits at the emergency department or admission due to asthma attack within the last 12 months” in all age groups. Conclusion: We established applicable nationwide definitions of “lifetime asthma,” “current asthma,” and “asthma aggravation” in Koreans by the Delphi survey.