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.

스파티필름 비율에 따른 포름알데히드 및 휘발성유기화합물 제거효율

박혜민,김윤정,류가영,이자희,이애경 한국화훼학회 2018 한국화훼학회 정기총회 및 학술발표회 자료집 Vol.26 No.1

Distribution and reproductive aspects of the pandalid shrimp, Pandalus eous, in the deep sea of the East Sea, Korea

박혜민,오철웅,손명호 한국통합생물학회 2012 Animal cells and systems Vol.16 No.1

The objective of the study was to investigate if reproductive characteristics of Pandalus eous affect the depth distribution in the East Sea of Korea. P. eous was found at depths of 500900 m in the East Sea of Korea, with the highest percentage occurrence (34%) at 500 m. A negative correlation was observed between the number of individuals and the depth. The overall sex ratio also turned out to be significantly correlated with depth. On average,the larger individuals (bigger than 26.37 cm), which included transitional, female, and ovigerous females, were mostly distributed at 700 m depth. The percentage of males increased by depth and ovigerous females were mainly distributed in the shallow water (300 m) during winter. Ovigerous females were not found at 900 m, which is the deepest depth range in this study. The percentage of transitional individuals was greatest at 500 m and decreased gradually with depth. All ovigerous female individuals were of the spent ovarian stage in winter. Female numbers in the ripe ovarian stage increased with depth and immature females rarely appeared. The gonadosomatic indices of the nonovigerous females and ovigerous females were highest at 700 m in depth. The mean egg size of P. eous was 0.8390.11 mm3 in the noneyed stage and 0.9390.17 mm3 in the eyed stage.

융게 도이체 필하모니 내한 연주회 <2002년 4월 24일 인천종합문화예술회관>

박혜민 한국음악평론가협회 2002 음악평론 Vol.12 No.-

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.

고도근시녹내장에서 안축장으로 보정한 빛간섭단층촬영 Significance Map의 유용성

박혜민,성민철,이원준 대한안과학회 2022 대한안과학회지 Vol.63 No.5

목적: 고도근시안의 황반부 및 시신경유두주변 significance map을 안축장으로 보정하여 지도의 각 망막영역별로 녹내장 진단 정확도의 변화를 분석하고 임상적 유용성에 대해 고찰하고자 한다. 대상과 방법: 고도근시를 동반한 정상안 42안과 정상안압녹내장 28안을 대상으로 후향적 분석하였다. Mirante spectral domain-optical coherence tomography를 이용하여 significance map을 얻었으며, 내장된 소프트웨어를 통해 안축장으로 보정하였다. 보정 전후로지도의 각 망막 영역별 민감도 및 특이도를 지도의 최소 한 영역에서 빨간색으로 표시되는 경우를 정상의 1% 수준에서 비정상, 노란색으로 표시되는 경우를 정상의 5% 수준에서의 비정상으로 정의하여 비교하였다. 결과: 정상치의 1% 수준에서는 유의한 변화가 없었다. 5% 수준에서는 황반부 GChart의 안쪽동심원의 하이측 영역은 61.9%에서78.6%로(p=0.016), 바깥쪽동심원의 하이측 영역은 69%에서 83.3%로의 증가(p=0.031)를 보였다. 시신경유두 주변의 whole chart, superior/inferior chart는 상측에서 각각 54.8%에서 78.6% (p=0.002), 59.5%에서 76.2% (p=0.039)로의 특이도의 증가, 12-clockwise map에서는 59.5%에서 76.2% (p=0.002)로의 특이도의 유의한 증가를 보였다. 결론: 안축장을 보정한 significance map의 참고가 위양성률을 줄이는 데 기여할 수 있으며, 고도근시안 환자의 녹내장 진료에 있어서도움을 줄 수 있을 것으로 생각된다.

부지 및 지하수 내 감시용 베타선 모니터링 시스템 연구

박혜민,박기현,박진훈,주관식 대한방사선방어학회 2016 대한방사선방어학회 학술발표회 논문요약집 Vol.2016 No.12

괜찮은 결정

박혜민 우리신학연구소 2010 갈라진 시대의 기쁜소식 Vol.- No.942

A VECM Analysis of Monetary and Fiscal Policies for the EU

박혜민,이재득 한국유럽학회 2014 유럽연구 Vol.32 No.1

This paper investigates the relative impact of monetary and fiscal policies on nine countries of the European Union(EU), using quarterly data between 1980:Q1 and 2012:Q3. Based on vector autoregression(VAR), cointegration and vector error correction model(VECM) are adopted to uncover relationships in both long-run and short-run; also dynamic interactions are identified to establish these relationships between variables through impulse response functions and variance decomposition methods. Results suggest that: In Austria, both monetary and fiscal policies have positive effects on the real national income; monetary policy has larger impact on GDP. In Denmark, fiscal policy has positive effect on the real national income. In Greece, both monetary and fiscal policies have positive effects on the real national income; monetary policy has larger impact on GDP. In Ireland, fiscal policy has positive effects on the real national income in the short-run. In Italy, no clear conclusions on the effects of both policies on GDP. In the Netherlands, fiscal policy has positive effects on the real national income. In Portugal, monetary policy has small positive effects on the real national income. In Spain, monetary has positive effects on the real national income. In Sweden, both fiscal and monetary policies have positive effects on the real national income; monetary policy has larger impact on GDP. The results show that increase in money supply has positive effect on the economic growth in Austria, Greece, Portugal, Spain and Sweden. In Denmark, Ireland and the Netherlands, increase in government spending stimulated economic growth.

Quality Assessment of Health Care of RA: Analysis of the Korea National Health Insurance claims data

박혜민,서미령,여지나,최효진,정재훈,백한주 대한내과학회 2022 대한내과학회 추계학술대회 Vol.2022 No.2