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그린 리모델링을 위한 중소규모 건물 석재 외장 외단열시스템의 열교 수준별 에너지성능 평가
최보혜,송승영 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.4
The purpose of this study is to compare the energy performance of the existing case using a conventional rectangular pipe frame and alternatives using double and single truss-shaped insulation frames and insulation pads to reduce linear and point thermal bridges in a stone-finished exterior insulation system. Annual heating and cooling energy use was estimated by performing a dynamic building energy simulation. In the building energy simulation, the thermal bridging effect was reflected by the linear and point thermal transmittance obtained from the 3D steady-state heat transfer simulation. Annual heating and cooling energy cost was estimated together. The results showed that the annual energy use of alt D and alt S with insulation frame decreased by 15.4% and 16.6%, the annual energy cost decreased by 14.6% and 15.7%, respectively. The annual energy use of alt D-P and alt S-P with insulation frame and pad decreased by 15.5% and 16.8%, the annual energy cost decreased by 14.7% and 16.0%, respectively.
CT영상에서의 AlexNet과 VggNet을 이용한 간암 병변 분류 연구
최보혜,김영재,최승준,김광기 대한의용생체공학회 2018 의공학회지 Vol.39 No.6
Liver cancer is one of the highest incidents in the world, and the mortality rate is the second most common disease after lung cancer. The purpose of this study is to evaluate the diagnostic ability of deep learning in the classification of malignant and benign tumors in CT images of patients with liver tumors. We also tried to identify the best data processing methods and deep learning models for classifying malignant and benign tumors in the liver. In this study, CT data were collected from 92 patients (benign liver tumors: 44, malignant liver tumors: 48) at the Gil Medical Center. The CT data of each patient were used for cross-sectional images of 3,024 liver tumors. In AlexNet and VggNet, the average of the overall accuracy at each image size was calculated: the average of the overall accuracy of the 200 × 200 image size is 69.58% (AlexNet), 69.4% (VggNet), 150 × 150 image size is 71.54%, 67%, 100 × 100 image size is 68.79%, 66.2%. In conclusion, the overall accuracy of each does not exceed 80%, so it does not have a high level of accuracy. In addition, the average accuracy in benign was 90.3% and the accuracy in malignant was 46.2%, which is a significant difference between benign and malignant. Also, the time it takes for AlexNet to learn is about 1.6 times faster than VggNet but statistically no different (p > 0.05). Since both models are less than 90% of the overall accuracy, more research and development are needed, such as learning the liver tumor data using a new model, or the process of pre-processing the data images in other methods. In the future, it will be useful to use specialists for image reading using deep learning.
최보혜,지상덕,손종곤,Phuong Nguyen,김기영,박영한,고영호 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Recently, we have reported that steamed and freeze-dried mature silkworm powder (SMSP) exerts biopharmaceutical effects, such as extending the healthy life span and increasing resistance to the onset of Parkinson's disease (PD) in animal models. Freeze-dried mulberry leaves (FDML), freeze-dried 3rd day fifth instar silkworm powder (FDSP), freeze-dried mature silkworm powder (FMSP), and SMSP were extracted with 4 different solvents and used in antioxidant activity assays, cell proliferation assays, and Drosophila behavioral assays to identify the components of SMSP responsible for the extension of the life span and enhanced resistance to rotenone-induced PD. Compared with those in the FDML, the phytochemical concentrations and antioxidant activities were significantly reduced in the three silkworm powders (SPs). However, the three SPs exhibited significantly greater inhibition of lipid peroxidation than the FDML. In addition, concentrates of 80% methanol (MeOH) extracts of SMSP (CMeSP) did not display any or only very low cytotoxicity, whereas concentrates from the other samples showed significant cytotoxicity, even at very low concentrations. Furthermore, the resistance to PD observed in SMSP food (SMSPf)-raised flies was accomplished by raising flies with foods containing either CMeSP or the dried portion remaining after the 80% MeOH extraction of SMSP (DMeSP), whereas the extended life expectancy of SMSPf-raised flies was only recapitulated when CMeSP and DMeSP were provided simultaneously. Substances inhibiting the onset of rotenone-induced PD were likely phytochemicals in CMeSP or MSderived digestible silk proteins in DMeSP. In contrast, the extension of life spans in normal individuals required substances found in both CMeSP and DMeSP, suggesting that the anti-aging mechanisms are more necessary for regulating the complex signaling pathways than the inhibition of the onset of PD.
기존 각파이프 프레임과 트러스 단열 프레임 적용 커튼월 시스템의 단열성능 비교평가
최보혜,신동일,송승영 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.1
The aim of this study is to compare the insulation performance of each curtain wall system applying the conventional rectangular pipe frame and the truss-shaped insulation frame that reduces the thermal bridging effect of the conventional frame. The insulation performance of each system was evaluated by performing a three-dimensional steady state heat transfer simulation reflecting the actual installation conditions. The results show that the heat losses of the conventional and alternative systems are 33.06 W and 21.12 W, respectively, and the effective U-factors are 0.264 W/㎡K and 0.169 W/㎡K, respectively. The effective U-factor of the conventional system is significantly higher than the design U-factor, indicating that the heat loss due to the thermal bridge is large. The effective U-factor of the alternative system is reduced by 36% compared to the conventional system, which significantly reduces the heat loss. In addition, the lowest indoor surface temperature and temperature difference ratio of the alternative system increases by 0.5℃ and decreases by 0.02, respectively, compared to the conventional system, which reduces the risk of condensation.
결로개선형 복층유리 이중창의 동계 공동주택 현장 성능 평가
최보혜(Choi, Bo-Hye),박시현(Park, Si-Hyun),송승영(Song, Seung-Yeong) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.6
To reduce condensation risk and ensure occupant comfort, the Korean Design Standard for Preventing Condensation in Apartment Buildings was enacted in 2014. Because this design standard is made recent, few window products satisfy the condensation resistance requirement for glazing edges, especially in the coldest region. The aim of this study is to verify the performance of a window developed to reduce the risk of condensation through field tests in an actual apartment. Infrared thermal images were taken, indoor and outdoor temperature and indoor surface temperature were measured on-site, and the temperature difference ratio was analyzed. As a result, the developed window showed a significant reduction in the risk of condensation compared to the existing window.
그린 리모델링을 위한 트러스 단열 프레임 적용 석재 외장 외단열 시스템의 단열성능 현장 평가
최보혜(Choi, Bo-Hye),송승영(Song, Seung-Yeong) 대한건축학회 2023 대한건축학회논문집 Vol.39 No.12
This study aims to assess the insulation performance of stone-finished exterior insulation system with truss-shaped insulation frames. The evaluation involves measuring the thermal transmittance of concrete exterior walls in small non-residential buildings where this system is implemented. Through on-site evaluation and analysis using the heat flow meter method and the average method, the thermal transmittance of the exterior wall was determined to be 0.188 W/㎡K. Following remodeling, the measured U-value showed a 79.0% reduction compared to pre-remodeling, surpassing the calculated U-value at 65.6%. This indicates an enhanced improvement in the thermal bridging effect with the application of an exterior insulation system with truss-shaped insulation frames. Additionally, the difference between the calculated and measured U-values, a critical verification condition in International Organization for Standardization (2014), was less than 20%, affirming the reliability of the on-site measured thermal transmittance.
열교 영향을 반영한 트러스 단열 프레임 적용 외단열 시스템의 에너지 성능 및 경제성 평가
최보혜(Choi, Bo-Hye),송승영(Song, Seung-Yeong) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.2
This study aims is to compare the energy performance and economic feasibility of outer wall insulation systems using conventional rectangular pipe frames as the base case with double and single truss-shaped insulation frames intended to reduce the thermal bridging effect of alt 1 and alt 2. Annual heating and cooling energy use were estimated by performing a dynamic building energy simulation. The thermal bridging effect was modeled by applying the linear thermal transmittance obtained from the three-dimensional steady-state heat transfer simulation to the building energy simulation. The annual energy cost, construction cost, and life cycle cost for 30 years were estimated together. The results indicated that the annual energy use of alt 1 and alt 2 decreased by 12.5% and 13.9%, the annual energy cost decreased by 11.8% and 13.2%, the construction cost decreased by 1.4% and 6.8% and the life cycle cost of alt 1 and alt 2 decreased by 2.6% and 7.5% respectively.