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친수성/소수성 나노클레이 기반 SSPCM (Shape-Stabilized Phase Change Materials)의 열적·형태학적 성능 평가
남지희(Nam, Ji-Hee),김수민(Kim, Su-Min) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
The COVID-19 pandemic has led to an increase in indoor occupancy, which in turn has led to an increase in building energy consumption. This has increased the demand for energy efficiency. Thermal energy storage is an effective way to save energy. In this study, Shape-Stabilized Phase Change Materials(SSPCM) to increase energy efficiency were prepared and evaluated. SSPCM was fabricated by vacuum impregnating with n-octadecane. Nanoclay consists of layers formed by arranging crystal structure. Natural Nanoclay, Interlayer space is hydrophilic. However, n-octadecane is hydrophobic. Due to low compatibility, three types of organic nanoclays were selected. The purpose of this study is to evaluate the thermal/morphological performance by comparing the hydrophilic and hydrophobic SSPCMs.
LPM 표면마감처리 활용 누출안정화 상변화물질/목질보드 축열성능 평가
남지희 ( Jihee Nam ),양성웅 ( Sungwoong Yang ),육현성 ( Hyeonseong Yuk ),김수민 ( Sumin Kim ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
As increased of the occupancy time, the thermal comfort of the occupants has been an important responsibility. Furniture having a large proportion of indoor space can affect the comfort of occupants. As the function of furniture is gradually expanded, research on thermal comfort and energy increase is being actively conducted. In this study, a phase change material (PCM) with excellent thermal energy storage capacity was applied to expand the thermal performance of furniture. PCM was integrated into the wood board through vacuum impregnation and showed latent heat and heat storage performance. Through the LPM finish, the possibility of PCM leakage of PCM/wood board was reduced, and it showed high stability in the heating-cooling cycle. PCM/wood board applied with LPM finishing treatment has high utility for furniture materials. It suggests the possibility of improving the thermal comfort of occupants when applied indoors.
간질환 종류에 따른 비침습적 간섬유화 평가법의 유용성 분석: C형 간염 보균자 중심으로
남지희(Nam Ji-Hee),김정훈(Kim Jung-Hoon) 대한방사선과학회(구 대한방사선기술학회) 2019 방사선기술과학 Vol.42 No.5
Liver biopsy is the gold standard for diagnosing liver fibrosis, but it is invasive and has a risk for complications. For this reason, recently, study has been actively conducted on non-invasive liver fibrosis evaluation method. But, there is no established standard for the type of diffuse liver disease. Therefore, this study was suggest the usefulness and cut-off values of Fibroscan, FIB-4, APRI and AAR of patients with hepatitis C in Korea. According to the diagnosis, 240 people in hepatitis C are classified into fatty liver, chronic hepatitis, and liver cirrhosis. The statistical analysis was performed by ANOVA to verify difference between groups. The ROC curve was analyzed to determine the usefulness and practical cut-off value. A s a result, for all diseases, the AUC value for Fibroscan was 0 .8 o ver a nd t he APRI was 0 .7 o ver. Cut-off value of serum based liver fibrosis markers was increased in order of fatty liver, chronic hepatitis and liver cirrhosis. If Fibroscan and serological liver fibrosis markers are applied to predict liver fibrosis, it is expected that excessive liver biopsy can be reduced.
열교환 효율 향상을 위한 상변화물질 적용 전열 환기 설비시스템 성능평가
남지희(Jihee Nam),양성웅(Sungwoong Yang),위승환(Seunghwan Wi),강유진(Yujin Kang),김수민(Sumin Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
As interest in saving energy in buildings and improving indoor air quality isincreasing, research on heat exchange ventilation systems is more active. Many studies have been conducted to increase the efficiency of the heat exchange ventilation system, a method of thermal energy Storage(TES) using a phase change material(PCM) with high latent heat has been proposed. This reduces the energy loss that occurs during ventilation through the exchange of latent and sensible heat. In this study, heat exchange efficiency was analyzed by introducing PCM to the existing heat exchange ventilation system. To this end, a Heat exchange device with PCM was manufactured, and experiment was conducted to compare and analyze the temperature reduction effect and exchange efficiency. As a result of the experiment, the heat exchange rate has increased by 5% compared to the previous one, which means that the energy efficiency of the ventilation system can be improved through the application of phase change materials, and it can help to reduce building energy.
복무부적응 용사 식별을 위한 온톨로지 구현 프로세스 설계
남지희(JiHee Nam),강동수(Dongsu Kang) 한국컴퓨터정보학회 2019 한국컴퓨터정보학회 학술발표논문집 Vol.27 No.2
군 내 복무부적응 용사들로 인한 병영사고는 대군 신뢰도 저하, 비전투력 손실로 인한 전투력 약화 등의 문제와 더불어 병영기피와 군에 대한 거부감까지 초래하고 있다. 군은 복무부적응 용사들을 사전에 식별하고 사고를 예방하기 위한 심리검사체계로 신인성검사를 자체 개발하여 적용하고 있지만, 이는 피검자의 의도적인 결과 왜곡이나 검사 결과에 대한 맹신 등의 문제점이 있다. 본 논문에서는 복무부적응 용사들의 행동 양식 및 증상들을 온톨로지로 설계하여 사고 우려자 식별을 위한 보조 도구로 활용할 수 있도록 온톨로지 구현프로세스를 제안한다. 복무부적응 용사 식별을 위한 온톨로지 구현을 통해 사고 우려자를 식별하는데 객관적인 기준 제공 및 정보 공유로 사고 예방에 효과적인 역할을 할 것으로 기대된다.