리튬이차전지 폐자원으로부터 회수된 황산리튬을 이용한 고순도 수산화리튬 분말 합성에 관한 연구

주소영 ( Soyeong Joo ),임병용 ( Byoungyong Im ),김대근 ( Dae-guen Kim ) 한국폐기물자원순환학회 2025 춘계학술연구발표회 Vol.2025 No.-

보로노이 다이어그램을 활용한 긴급대피소 최적 위치 분석

이소영(Lee, Soyeong),김도현(Lee, Soyeong),주희선(Joo, Heesun) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.1

최근 한국의 지진 발생 빈도는 점점 높아지는 추세로 긴급대피소의 위치를 선정하는 것이 매우 중요하다. 이에 본 연구에서는 최단 경로를 찾거나 관할구역을 나누기 위해 유용하게 사용되는 보로노이 다이어그램을 활용하여 긴급대피소 위치를 선정하는 방법을 제시하였다. 먼저, 연구지역은 지진대가 위치한 양산시를 대상지로 선정하였으며, 지진 발생 시 행정구역과 관계없이 인근 긴급대피소로 대피한다는 가정하에 보로노이 다각형을 이용한 대피 시설 권역을 분석하였다. 다음으로 기존의 지진옥외 대피 시설 자료와 유동 인구 데이터를 토대로 연구지역의 대피 취약지를 살펴본 결과, 지역별로 편차가 큰 것을 확인할 수 있었다. 마지막으로 공급이 부족한 곳의 건물 위치 데이터와 긴급 대피 시설 간 거리를 가중치로 정량화하여 양산시 신규 대피소 위치를 선정하였다. 분석 결과, 총 7개의 대피소를 설치하는 것이 가장 효율성이 높은 것으로 도출되었다. 본 연구의 결과는 향후 새로운 대피 시설의 위치를 선정하고 효율적인 대피 계획을 수립하는 데에 기여할 수 있을 것으로 판단된다. Recently, the frequency of earthquakes in Korea has increased; thus it is very important to select the location of an emergency shelter. Therefore, this study proposed a method for selecting an emergency shelter location using the Voronoi diagram, which is usefully used to identify the shortest route or divide jurisdictions. First, Yangsan-si, where the earthquake zone is located, was selected as the target site for the study area, and the evacuation facility area was analyzed using the Voronoi polygon considering an evacuation to nearby emergency shelters regardless of administrative districts. Next, examining the vulnerable portions of the study area based on the existing earthquake outdoor evacuation facility data and floating population data, it was confirmed that there was a large regional variation. Finally, the location of a new shelter in Yangsan-si was selected by quantifying the location data of the building where supply was insufficient and the distance between emergency evacuation facilities as weights. The analysis result showed that installing a total of 7 shelters was the most efficient. The results of this study are expected to contribute to selecting the location of a new evacuation facility and establishing an efficient evacuation plan in the future.

빈집의 현황 및 공간적 밀집 분포 연구

이소영(Soyeong Lee),주희선(Heesun Joo) 대한공간정보학회 2020 한국지형공간정보학회 학술대회 Vol.2020 No.6

고온 표면에 충돌하는 액체 제트의 비등 열전달 특성에 대한 수치해석 연구

이소영(Soyeong Lee),문주현(Joo Hyun Moon),이정호(Jungho Lee),이성혁(Seong Hyuk Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.11

Numerical study on flow and heat transfer characteristics of air-jet cooling system

Moon, Joo Hyun,Lee, Soyeong,Park, Jee Min,Lee, Jungho,Kim, Daejoong,Lee, Seong Hyuk Springer-Verlag 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.12

지역 내 빈집 증가가 주택 매매가격에 미치는 영향 분석

이소영(Lee, Soyeong),주희선(Joo, Heesun),김경원(Kim, Kyeongwon),김도현(Kim, Dohyeon) 한국주거환경학회 2021 주거환경(한국주거환경학회논문집) Vol.19 No.4

빈집이 증가할수록 해당 지역에 더욱 부정적인 영향을 미친다. 빈집이 증가하면 지역 내 범죄 장소 제공, 지역사회의 활기 저하, 외관 훼손과 생활환경 악화 등으로 주민들의 불안감을 증대시키는 문제가 발생한다. 본 연구는 2017년부터 2019년까지 패널 데이터를 통한 패널 회귀 분석을 실시하여 빈집이 주택가격에 영향을 미치는지 여부를 판단하는 것이 목적이다. 이에 공동주택, 빈집, 단독주택, 아파트, 연립주택, 다세대주택, 비주거주택, 기초생활보장 수급자, 1인 가구, 표준화 사망비, 시·군 입주, 시·군 구간, 지가 변동률 등을 변수로 설정하여 분석을 진행하였다. 분석 결과, 빈집, 단독주택, 1인 가구수, 시·군·구간 이전, 시·도간 이전 및 지가 상승이 긍정적(+) 효과를 보인 것으로 나타났다. 비주거 주택과 주택 이외의 주택은 (-) 효과가 있는 것으로 나타났다. 본 연구는 빈집과 주택매매가격 사이의 부정적인 측면을 실증했다는 점에 의의가 있으며, 이에 빈집을 억제하고 활용할 수 있는 대책 마련이 시급함을 시사하였다. 빈집이 증가하면 지역 내 범죄 장소 제공, 지역사회의 활기 저하, 외관 훼손과 생활환경 악화 등으로 주민들의 불안감을 증대시키는 문제가 발생한다. 본 연구는 2017년부터 2019년까지 패널데이터를 통한 패널 회귀분석을 실시하여 빈집이 주택가격에 영향을 미치는지 여부를 판단하는 것이 목적이다. 이에 공동주택, 빈집, 단독주택, 아파트, 연립주택, 다세대주택, 비주거주택, 기초생활보장 수급자, 1인 가구, 표준화 사망비, 시·군 입주, 시·군 구간, 지가 변동률 등을 변수로 설정하여 분석을 진행하였다. 분석 결과, 빈집, 단독주택, 1인 가구수, 시·군·구간 이전, 시·도간 이전 및 지가 상승이 긍정적(+) 효과를 보인 것으로 나타났다. 비주거 주택과 주택 이외의 주택은 (-) 효과가 있는 것으로 나타났다. 본 연구는 빈집과 주택매매가격 사이의 부정적인 측면을 실증했다는 점에 의의가 있으며, 이에 빈집을 억제하고 활용할 수 있는 대책 마련이 시급함을 시사하였다. 아울러 빈집 분포 및 현황 통계 수립 등 빈집 유지·활용을 위한 다양한 지원 방안을 모색할 필요가 있음을 시사한다. 빈집 정비는 상당한 공적예산이 필요하기 때문에 예산의 실효성을 분석하고 경제적 편익 추정을 토대로 빈집 정비사업 대상지 선정 우선순위를 정할 필요가 있다. 이를 통해 수혜 항목 중 빈집 정비에 따른 주택 매매가격 인상도 고려해야 한다. The more vacant houses there are, the more negatively they affect the area. As the number of vacant houses increases, the provision of criminal places in the area, the vitality of the local community decreases, and anxiety among residents increases due to damage to appearance and deterioration of the living environment. This study is to determine whether vacant houses affect housing prices by conducting panel regression analysis through panel data from 2017 to 2019. The variables are as follows. The number of apartment houses, vacant houses, detached houses, apartments, row houses, multi-family houses, non-residential houses, non-residential houses, basic living security recipients, single-person households, standardized death costs, city/county moving in, city/county section, and land price change rate were set as variables. The results are as follows. It was found that the number of vacant houses, detached houses, number of single-person households, relocation between cities, counties, and districts, and relocation between cities and provinces and housing prices had a positive (+) effect. It was found that non-residential housing and residences other than housing had a (-) effect. Since this study showed the negative aspect of house price decline due to vacant houses, it suggests that it is urgent to prepare measures to contain vacant houses and utilize them. In addition, it need to find various support methods for the maintenance or utilization of vacant houses, such as data on the distribution of vacant houses and establishment of statistics on the current status. Since the maintenance of vacant houses requires considerable public budget funds, it is necessary to analyze the effectiveness of the budget and prioritize the selection of target sites for vacant houses maintenance projects based on the estimation of economic benefits. Through this, the increase in housing sales prices due to the maintenance of vacant houses among the items of benefit should be considered.

저농도 은이 함유된 LTCC 전극공정부산물로부터 은 회수 및 나노입자 제조 연구

주소영,안낙균,이찬기,윤진호,Joo, Soyeong,Ahn, Nak-Kyoon,Lee, Chan Gi,Yoon, Jin-Ho 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3

In this paper, the recovery and nanoparticle synthesis of Ag from low temperature co-fired ceramic (LTCC) by-products are studied. The effect of reaction behavior on Ag leaching conditions from the LTCC by-products is confirmed. The optimum leaching conditions are determined to be: 5 M $HNO_3$, a reaction temperature of $75^{\circ}C$, and a pulp density of 50 g/L at 60 min. For the selective recovery of Ag, the [Cl]/[Ag] equivalence ratio experiment is performed using added HCl; most of the Ag (more than 99%) is recovered. The XRD and MP-AES results confirm that the powder is AgCl and that impurities are at less than 1%. Ag nanoparticles are synthesized using a chemical reduction process for recycling, $NaBH_4$ and PVP are used as reducing agents and dispersion stabilizers. UV-vis and FE-SEM results show that AgCl powder is precipitated and that Ag nanoparticles are synthesized. Ag nanoparticles of 100% Ag are obtained under the chemical reaction conditions.

Facile Fabrication of a Two-Dimensional TMD/Si Heterojunction Photodiode by Atmospheric-Pressure Plasma-Enhanced Chemical Vapor Deposition

Kim, Yonghun,Kwon, Soyeong,Seo, Eun-Joo,Nam, Jae Hyeon,Jang, Hye Yeon,Kwon, Se-Hun,Kwon, Jung-Dae,Kim, Dong-Wook,Cho, Byungjin American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.42

<P>A growth technique to directly prepare two-dimensional (2D) materials onto conventional semiconductor substrates, enabling low-temperature, high-throughput, and large-area capability, is needed to realize competitive 2D transition-metal dichalcogenide (TMD)/three-dimensional (3D) semiconductor heterojunction devices. Therefore, we herein successfully developed an atmospheric-pressure plasma-enhanced chemical vapor deposition (AP-PECVD) technique, which could grow MoS<SUB>2</SUB> and WS<SUB>2</SUB> multilayers directly onto PET flexible substrate as well as 4-in. Si substrates at temperatures of <200 °C. The as-fabricated MoS<SUB>2</SUB>/Si and WS<SUB>2</SUB>/Si heterojunctions exhibited large and fast photocurrent responses under illumination of a green light. The measured photocurrent was linearly proportional to the laser power, indicating that trapping and detrapping of the photogenerated carriers at defect states could not significantly suppress the collection of photocarriers. All the results demonstrated that our AP-PECVD method could produce high-quality TMD/Si 2D-3D heterojunctions for optoelectronic applications.</P> [FIG OMISSION]</BR>

폐리튬이차전지에서 회수한 탄산리튬으로부터 2-step 침전공정을 이용한 고순도 수산화리튬 분말 제조 연구

주소영,강유빈,심현우,변석현,김용환,이찬기,김대근,Joo, Soyeong,Kang, Yubin,Shim, Hyun-Woo,Byun, Suk-Hyun,Kim, Yong Hwan,Lee, Chan-Gi,Kim, Dae-Guen 한국자원리싸이클링학회 2019 자원리싸이클링 Vol.28 No.5

A valuable metal recovery from waste resources such as spent rechargeable secondary batteries is of critical issues because of a sharp increase in the amount of waste resources. In this context, it is necessary to research not only recycling waste lithium-ion batteries (LIBs), but also reusing valuable metals (e.g., Li, Co, Ni, Mn etc.) recovered from waste LIBs. In particular, the lithium hydroxide ($LiOH{\cdot}xH_2O$), which is of precursors that can be prepared by the recovery of Li in waste LIBs, can be reused as a catalyst, a carbon dioxide absorbent, and again as a precursor for cathode materials of LIB. However, most studies of recycling the waste LIBs have been focused on the preparation of lithium carbonate with a recovery of Li. Herein, we show the preparation of high purity lithium hydroxide powder along with the precipitation process, and the systematic study to find an optimum condition is also carried out. The lithium carbonate, which is recovered from waste LIBs, was used as starting materials for synthesis of lithium hydroxide. The optimum precipitation conditions for the preparation of LiOH were found as follows: based on stirring, reaction temperature $90^{\circ}C$, reaction time 3 hr, precursor ratio 1:1. To synthesize uniform and high purity lithium hydroxide, 2-step precipitation process was additionally performed, and consequently, high purity $LiOH{\cdot}xH_2O$ powder was obtained.

과산화 티타늄 복합체를 이용한 염료감응형 태양전지용 페이스트의 제조 및 열처리 온도에 따른 특성

박현수,주소영,최준필,김우병,Park, Hyunsu,Joo, Soyeong,Choi, Joon-Phil,Kim, Woo-Byoung 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.6

The organic binder-free paste for dye-sensitized solar cell (DSSC) has been investigated using peroxo titanium complex. The crystal structure of $TiO_2$ nanoparticles, morphology of $TiO_2$ film and electrical properties are analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Electrochemical Impedance Spectra (EIS), and solar simulator. The synthesized $TiO_2$ nanopowders by the peroxo titanium complex at 150, 300, $400^{\circ}C$, and $450^{\circ}C$ have anatase phase and average crystal sizes are calculated to be 4.2, 13.7, 16.9, and 20.9 nm, respectively. The DSSC prepared by the peroxo titanium complex binder have higher $V_{oc}$ and lower $J_{sc}$ values than that of the organic binder. It can be attributed to improvement of sintering properties of $TCO/TiO_2$ and $TiO_2/TiO_2$ interface and to formation of agglomerate by the nanoparticles. As a result, we have investigated the organic binder-free paste and 3.178% conversion efficiency of the DSSC at $450^{\circ}C$.