토픽모델링을 이용한 국내 미세먼지 연구 분류 및 연구동향 분석

박혜민,김태용,권대웅,허준용,이주연,양민준,Park, Hyemin,Kim, Taeyong,Kwon, Daewoong,Heo, Junyong,Lee, Juyeon,Yang, Minjune 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.5

The particulate matter (PM) has emerged as a hot topic around the world as it has been reported that PM is related to an increase in mortality and prevalence rates. In South Korea, the importance of PM has been recognized since the late 1990s, and various studies on PM have been conducted. This study investigated the PM research topics and trends for papers (D=2,764) published in Research Information Sharing Service (RISS) using topic modeling based on Latent Dirichlet Allocation (LDA). As a result, a total of 10 topics were identified in the whole papers, and the PM research topics were classified as 'PM reduction (Topic 1)', 'Government policy and management (Topic 2)', 'Characteristics of PM (Topic 3)', 'PM model (Topic 4)', 'Environmental education (Topic 5)', 'Bio (Topic 6)', 'Traffic (Topic 7)', 'Asian dust (Topic 8)', 'Indoor PM (Topic 9)', 'Human risk (Topic 10)'. In particular, the proportion of papers on topics 'Government policy and management (Topic 2)', 'PM model (Topic 4)', 'Environmental education (Topic 5)', and 'Bio (Topic 6)' to the toal number of papers increased over time (linear slope > 0). The results of this study provide the new literature review methodology related to particulate matter and the history and insight. 전 세계적으로 미세먼지(particulate matter, PM)와 사망률 및 유병률 증가의 관련성이 보고되면서 다양한 연구가 수행되었으며, 우리나라에서는 1990년대 후반을 기점으로 PM에 대한 중요성을 인식하고, PM에 대한 다양한 연구가 수행되었다. 본 연구에서는 '미세먼지' 관련 연구들의 주제를 분류하고, 각 주제별 연구 동향을 확인하기 위해 Research Information Sharing Service (RISS)에 게재된 미세먼지 관련 2,764편의 논문을 대상으로 Latent Dirichlet Allocate (LDA) 분석을 수행하였다. 연구 결과, 총 10개의 주제로 분류하는 것이 가장 적합하였으며, 미세먼지 관련 연구주제는 '미세먼지 저감(Topic 1)', '정부 정책 및 관리(Topic 2)', '미세먼지 특성(Topic 3)', '미세먼지 모델(Topic 4)', '환경교육(Topic 5)', '바이오(Topic 6)', '교통수단(Topic 7)', '황사(Topic 8)', '실내 미세먼지 오염(Topic 9)', '인체 위해성(Topic 10)'의 주제로 분류할 수 있었다. 특히, '정부 정책 및 관리(Topic 2)', '미세먼지 모델(Topic 4)', '환경교육(Topic 5)'. '바이오(Topic 6)' 관련 연구주제들이 시간에 따라 전체 논문에 대한 비율이 증가하는 추세를 보여 성행하는 것을 확인하였다(linear slope>0). 본 연구의 결과는 미세먼지 관련 다양한 분야의 연구자들에게 새로운 문헌 고찰의 방법론을 제시하고, 미세먼지 분야의 역사와 발전에 대한 이해를 제공했음에 의의가 있다.

아스팔트 혼합물의 골재 간극률 예측을 위한 기계학습 프레임워크

박혜민,나일호,김현환,지봉준,Hyemin Park,Ilho Na,Hyunhwan Kim,Bongjun Ji 한국지반신소재학회 2024 한국지반신소재학회 논문집 Vol.23 No.1

The Voids in the Mineral Aggregate (VMA) within asphalt mixtures play a crucial role in defining the mixture's structural integrity, durability, and resistance to environmental factors. Accurate prediction and optimization of VMA are essential for enhancing the performance and longevity of asphalt pavements, particularly in varying climatic and environmental conditions. This study introduces a novel machine learning framework leveraging ensemble machine learning model for predicting VMA in asphalt mixtures. By analyzing a comprehensive set of variables, including aggregate size distribution, binder content, and compaction levels, our framework offers a more precise prediction of VMA than traditional single-model approaches. The use of advanced machine learning techniques not only surpasses the accuracy of conventional empirical methods but also significantly reduces the reliance on extensive laboratory testing. Our findings highlight the effectiveness of a data-driven approach in the field of asphalt mixture design, showcasing a path toward more efficient and sustainable pavement engineering practices. This research contributes to the advancement of predictive modeling in construction materials, offering valuable insights for the design and optimization of asphalt mixtures with optimal void characteristics.

우라늄 제거를 위한 실험실 규모 동전기 장치의 개선 방안

박혜민,김계남,김승수,김완석,박욱량,문제권,Park, Hye-Min,Kim, Gye-Nam,Kim, Seung-Soo,Kim, Wan-Suk,Park, Uk-Ryang,Moon, Jei-Kwon 한국방사성폐기물학회 2013 방사성폐기물학회지 Vol.11 No.2

The original pilot-scale electrokinetic equipment suitable to soil contamination characteristics of Korean nuclear facility sites was manufactured for the remediation of soil contaminated with uranium. During the experiment with the original electrokinetic equipment, many metal oxides were generated and were stuck on the cathode plate. The uranium removal capability of the original electrokinrtic equipment was almost exhausted because the cathode plate covered with metal oxides did not conduct electricity in the original electrokinetic equipment. Therefore, the original electrokinetic equipment was improved. After the remediation experience for 25 days using the improved electrokinetic remediation equipment, the removal efficiency of uranium from the soil was 96.8% and its residual uranium concentration was 0.81 Bq/g. When the initial uranium concentration of soil was about 50 Bq/g, the electrokinetic remediation time required to remediate the uranium concentration below clearance concentration of 1.0 Bq/g was about 34 days. When the initial uranium concentration of soil was about 75 Bq/g, the electrokinetic remediation time required to remediate below 1.0 Bq/g was about 42 days. When the initial uranium concentration of soil was about 100 Bq/g, the electrokinetic remediation time required to remediate below 1.0 Bq/g was about 49 days. 방사능 오염 토양 복원을 위해 실험실 규모의 동전기 복원장치를 제작하여 가동 하던 중 토양 내 존재하던 금속이온의 용출로 금속 산화물이 발생하여 음극의 전류 흐름을 차단하는 문제가 발생하였다. 전류의 차단으로 토양 내 우라늄 제거 능력이 상실되어 이러한 문제를 해결하는 해결 방안을 모색하여 개선된 동전기 복원 장치를 제작하였다. 개선된 실험실 규모 동전기 복원 장치를 이용하여 토양복원 실험을 25 일간 수행 하였을 때 우라늄 잔류 농도는 0.81 Bq/g으로 약 96.8%의 제거 효율을 보였으며, 초기 우라늄 농도 50 Bq/g 일 때 우라늄 규제 해제 농도인 1 Bq/g 이하로 제거 되기 까지는 34 일의 복원 기간이 필요하고, 초기 우라늄 농도 75 Bq/g, 100 Bq/g 일 때 각 42 일, 49 일이 필요한 것으로 나타났다.

Effects of Induction Culture on Osteogenesis of Scaffold-Free Engineered Tissue for Bone Regeneration Applications

박혜민,김선화,최병현,Sang-Hyug Park 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.2

BACKGROUND: Restoration of the bone defects caused by infection or disease remains a challenge in orthopedic surgery. In recent studies, scaffold-free engineered tissue with a self-secreted extracellular matrix has been proposed as an alternative strategy for tissue regeneration and reconstruction. Our study aimed to engineer and fabricate self-assembled osteogenic and scaffold-free tissue for bone regeneration. METHODS: Osteogenic scaffold-free tissue was engineered and fabricated using fetal cartilage-derived progenitor cells, which are capable of osteogenic differentiation. They were cultured in osteogenic induction environments or using demineralized bone powder for differentiation. The fabricated tissue was subjected to real-time qPCR, biochemical, and histological analyses to estimate the degree of in vitro osteogenic differentiation. To demonstrate bone formation in an in vivo environment, scaffold-free tissue was transplanted into the dorsal subcutaneous site of nude mice. Bone development was monitored postoperatively over 8 weeks by the observation of calcium deposition in the matrix. RESULTS: In the in vitro experiments, engineered osteogenically induced scaffold-free tissue demonstrated three-dimensional morphological characteristics, and sufficient osteogenic differentiation was confirmed through the quantification of specific osteogenic gene markers expressed and calcium accumulation within the matrix. Following the evaluation of differentiation efficacy, in vivo experiments revealed distinct bone formation, and that blood vessels had penetrated the fabricated tissue. CONCLUSION: The novel engineering of scaffold-free tissue with osteogenic potential can be used as an optimal bone graft substitute for bone regeneration.

컨조인트 분석을 이용한 지식정보 데이터베이스 서비스 품질에 대한 고객 선호도 조사

박혜민(Hyemin Park),박희준(Heejun Park),백민호(Minho Baek),박종우(Jongwoo Park) 한국IT서비스학회 2008 한국IT서비스학회지 Vol.7 No.2

  This research is to study the core factors for knowledge information database service and very important database service quality factors to improve customer satisfaction. The database service quality has been critical issue rather than just information service in these days, because the qualitative aspect is becoming more important factors rather than quantitative aspect. As database service quality has been influenced by satisfaction of database user, it needs to try to get excellent results by enhancing ability to obtain information. In order to satisfy this condition, it needs to measure database service quality more accurately first. In this study, we apply conjoint analysis to measure how much to give quality condition to achieve customer satisfaction.

Alemtuzumab을 이용한 이차성 순적혈구 빈혈의 치료

박혜민 ( Hye Min Park ),임재욱 ( Jae Uk Im ),박주환 ( Ju Hwan Park ),김은혜 ( En Hye Kim ),전홍길 ( Hong Gil Jun ),박재후 ( Jae Hoo Park ),김혁 ( Hawk Kim ) 대한내과학회 2013 대한내과학회지 Vol.85 No.2

Pure red cell aplasia (PRCA) in adults is usually idiopathic, although some underlying conditions can cause PRCA. Immunosuppressive therapy (IST) is used to treat PRCA, but IST has side effects and may fail. The anti-CD52 monoclonal antibody alemtuzumab (ALM) was recently used to successfully treat therapy-resistant PRCA. We herein report successful treatment of secondary PRCA after erythropoietin therapy using ALM and cyclosporin A (CsA) in one patient. The total dose of ALM was 60 mg over 3 days (10, 20, and 30 mg, respectively) plus CsA for at least 6 months. The patient achieved a complete response 18 months after ALM-CsA treatment and his treatment could be changed to a different erythropoietin stimulating agent. (Korean J Med 2013;85:214-217)

철 전극 전기분해를 이용한 지하수 중의 질산성질소 제거

박혜민 ( Hye Min Park ),신자원 ( Ja Won Shin ),주경민 ( Kyung Min Joo ),박주양 ( Joo Yang Park ) 한국물환경학회 ( 구 한국수질보전학회 ) 2008 공동 추계학술발표회 Vol.2008 No.-

증 례 : 우연히 발견된 십이지장 천공 증례

박혜민 ( Hye Min Park ),도민영 ( Min Young Do ),최세명 ( Sei Myung Choi ),양경호 ( Kyung Ho Yang ),허창재 ( Chang Jae Hur ),조광범 ( Kwang Bum Cho ) 대한췌담도학회 2015 대한췌담도학회지 Vol.20 No.4

대부분의 십이지장 천공은 증상을 유발하므로 급성기에 발견된다. 그러므로 시기를 알 수 없이 우연히 발견된 만성 십이지장 천공은 드물고 치료의 기준도 명확하지 않다. 본 증례 경우에는 보존적 치료 후에 병변이 호전되었다. 이와 같이 우연히 천공이 발견된 증례는 드물고 향후 관심이 필요할 것으로 사료되어 문헌 고찰과 함께 보고한다. Duodenal perforation can occur due to complications caused by ulcers, other inflammation or by the instrument used during the procedure such as endoscopy, endoscopic retrograde cholangiopancreatography (ERCP); however, its incidence is not high. Most cases of perforation of the lateral wall of the duodenum are acute and require immediate surgical or endoscopic treatment. Cases of chronic duodenal perforation are rarely reported. This report presents the case of a previous perforation that was discovered unexpectedly during ERCP in a patient with cholangitis due to common bile duct stones. The time of occurrence of the perforation was unknown. After medical treatment, the patient was able to return to daily life. We have reported this case along with a literature review.

변산향유 종자 발아에 미치는 온도의 영향

박혜민(Hye Min Park),박지은(Ji Eun Park),이상인(Sang In Lee),김상용(Sang Yong Kim),조원우(Won Woo Cho) 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10

변산향유(Elsholtzia byeonsanensis M. Kim)는 전북 변산에서 발견된 향유속 신종으로 분포지역이 매우 좁은 한국 고유종이다. 주로 바닷가 바위 틈에서 자라며 한해살이풀로 꽃향유에 비해 식물체가 작은 특징을 갖고 있으며, 잎은 털이 없고 윤기가 나며 꽃은 수상꽃차례로 10~11월에 개화한다. 변산향유의 원예적 가치가 높다고 알려져 있지만 최근에 알려진 식물로 재배 연구가 미흡하다. 따라서, 본 연구는 변산향유의 재배기술 개발을 위한 기초자료 수집의 일환으로 종자 발아를 위한 적정 온도를 구명하기 위하여 실시하였다. 변산향유 종자는 2020년 11월에 채종 후 4°C에 보관하였다가 2021년 7월 사선법으로 정선하여 충실한 종자만을 사용하였다. 모든 처리구는 petri dish에 filter paper 2매를 깔고, 20립씩 3반복으로 치상하였으며, 7일간 Growth chamber 내에서 온도(5, 10, 15, 20, 25, 30°C)에 따른 발아 특성을 조사하였다. 총 발아율은 5°C (0.0 ± 0.0), 10°C (68.3 ± 4.4), 15°C (73.3 ± 7.3), 20°C (81.7 ± 4.4), 25°C (68.3 ± 10.1), 30°C (6.7 ± 4.4)로 5°C는 발아하지 않았으며, 20°C 온도 처리 시 유의차를 보이며 발아율이 가장 높았다. 15°C 발아세는 0.0 ± 0.0, 평균발아일수 5.8, 발아균일도 22.1로 조사되었으며, 발아속도 0.2, 평균발아속도 2.1로 나타났다. 또한, 20°C의 발아세는 51.7, 평균발아일수 4.5, 발아균일도 11.6으로 처리구 중 가장 높은 것으로 조사되었다. 20°C 온도 처리 시 종자발아속도는 0.2으로 10, 15, 30°C 처리구와 유의차가 없었으나, 평균발아속도는 8.0로 다른 처리구에 비해 빠른 것으로 알 수 있었다. 따라서, 변산향유 종자는 파종 후 20°C 온도 처리가 발아에 있어 가장 적합한 것으로 판단된다.

인공해수와 0가 철 부식을 이용한 질산성질소 제거

박혜민(Park Hye Min),신자원(Shin Ja Won),최원호(Choi Won Ho),박주양(Park Joo Yang) 대한토목학회 2008 대한토목학회 학술대회 Vol.2008 No.10