ECO2를 이용한 노후 공공 건축물 에너지 성능평가 시 주요 입력변수의 영향도 분석

변지연(Ji Yeon Byun),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11

For achieving carbon-neutrality in building sector, retrofit for old buildings is crucial. Accordingly, a green-remodeling or green-retrofit to improve the energy performance of old public building is in progress in Korea. The energy saving effect through domestic green remodeling is evaluated using the Building Energy Efficiency Rating Certification Evaluation Program (ECO2). Various input data are required for ECO2 energy performance evaluation, and an error in the input value greatly affects the energy performance evaluation result. The energy use intensity of the last years green remodeling projects showed a large deviation despite similar uses, structures, and locations. The aims of this study is to evaluate the impact of the input variables on energy performance using the ECO2 program. The main input variables that cause large deviations on the result of the building energy performance are analyzed. The results showed that the window U-vlaue and the wall U-vlaue were found to have the greatest influence on the results. In order to reduce the deviation of the results, it seems that a follow-up study on the appropriate input values of the window U-vlaue and the wall U-vlaue

건물 외벽 열관류율 현장측정에서 일사의 영향 분석

변지연(Ji Yeon Byun),박소민(So Min Park),심지수(Ji Soo Shim),송두삼(Doo Sam Song) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6

Thermal performance of building envelope, especially thermal transmittance of wall affects the heating and cooling load. There are methods to measure the thermal transmittance of wall, HFM, ASTR, and IRT Method. HFM Method(ISO 9869-1) is widely used and know to be the most reliable method. This method is prescribed to be measured by the North for at least 3 days to exclude the effects of solar radiation. However, in actual building conditions, there are cases where it is unavoidable to measure the south wall. Therefore, data processing to correct the measured result is required, and the data is averaged and the length of measured period is decided by convergence of data. The aims of this study is to analyze the effect of solar radiation on in-situ measurement results of thermal transmittance of building envelope. Minimum measurement period to determine wall transmittance of South wall is analyzed. The results showed that the south wall showed a large fluctuation in the heat flux due to the solar radiation compared to the north. All the conditions for convergence were satisfied after five days for the north wall, while it is need to measure more than 10 days for the south wall. It is difficult to produce reliable results during the minimum required period (3 days).

노후 건물의 에너지 성능 분석에서 경년변화와 환경요인을 고려한 열관류율의 가중계수 제안

변지연(Ji Yeon Byun),박소민(So Min Park),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

The aims of this study is to propose the weighting factor of building thermal transmittance considering the elapsed year and building conditions. This method can relatively accurately predict the heat flow rate of the old building envelope by visual observation alone. Based on the on-site measurement of the thermal transmittance(Heat Flux Method) for a total of 39 old buildings, a weighting factor to correct the thermal transmittance by visual inspection was calculated. As a result of a regression analysis between the measured thermal transmittance and designed value, the type of exterior wall finishing material, color, and ambient climatic conditions actually affected the deterioration of the thermal performance of the wall.

노후 건물의 에너지 성능 분석에서 경년변화와 환경요인을 고려한 열관류율의 가중계수 제안

변지연(Ji Yeon Byun),박소민(So Min Park),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

The aims of this study is to propose the weighting factor of building thermal transmittance considering the elapsed year and building conditions. This method can relatively accurately predict the heat flow rate of the old building envelope by visual observation alone. Based on the on-site measurement of the thermal transmittance(Heat Flux Method) for a total of 39 old buildings, a weighting factor to correct the thermal transmittance by visual inspection was calculated. As a result of a regression analysis between the measured thermal transmittance and designed value, the type of exterior wall finishing material, color, and ambient climatic conditions actually affected the deterioration of the thermal performance of the wall.

Infectious exanthems in childhood

변지연 ( Ji Yeon Byun ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1

Educational Lecture 1-5 (EL 1-5) : Topical and systemic corticosteroids

변지연 ( Ji Yeon Byun ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1

Glucocorticosteroids (GC) continue to be among the most frequently prescribed anti-inflammatory agents in dermatology and all of medicine, with a large number of disorders responding to these drugs. Clinical pharmacology and therapeutic use of GC in dermatology are reviewed in this presentation. The major naturally occurring GC is cortisol (hydrocortisone). Under basal conditions, the adrenals produce approximately 20 mg of cortisol (equivalent to 5 mg of prednisone), with a diurnal peak around 8AM. All steroids, including GC, have the basic four-ring structure of cholesterol, with three hexane rings and one pentane ring. Modifications of cortisol result in compounds that have different potencies, mineralocorticoid effects, durations of action, metabolism and adverse effects. Systemic GC can be administered intralesionally, orally, intramuscularly, and intravenously. Intralesional GC administration allows direct access to either a relatively few lesions or a particularly resistant lesion. Triamcinolone acetonide is diluted to the desired concentration (2~40mg) and injected in small amounts into the lesion(s). Dermatologists occasionally use intramuscular (IM) administration of GC for control of acute dermatoses. There are several drawbacks to IM injection because of erratic absorption and lack of daily control of the dose. IM agents, such as betamethasone and dexamethasone, which have a duration of action of less than 1 week, may be preferred in self-limited dermatoses. Longer-acting IM agents that produce effects for about 3 weeks, such as triamcinolone acetonide and methylprednisolone acetate, should not be given more than about 4-6 times per year. When oral GCs are prescribed, prednisone and prednisolone are most commonly selected and usually administered daily or every other day; although for acute disease, split daily doses can be used. If less than 3-4 weeks, GC therapy can be stopped without tapering. Intravenous (IV) doses of GCs may be necessary in severe or life-threatening dermatologic conditions. A total daily dose of 2 mg/kg or more of methylprednisolone is given initially in divided doses every 6-8 hours. Another method of dosing is IV pulse therapy; methylprednisolone is given IV in doses of 0.5-1 g over 2 hours daily for 1-5 days. Topical GC regimens are available in a wide range of potencies and a variety of vehicles. Topical GCs can be categorized into seven classes based on potency ranging from the superpotent agents in class 1 to the very low potency agents in class 7, based on vasoconstrictor assays. The vehicle cangreatly influence the percutaneous absorption and therapeutic efficacy of GCs. In an attempt to develop GC compounds with optimal potency and minimal side effects, GC molecules that retain high activity in the skin and are quickly broken down into inactive metabolites have developed. Some of those compounds include budesonide, mometasone furoate, prednicarbate, methylprednisolone aceponate, alclometasone dipropionate, and fluticasone propionate.

노후 건물의 에너지 성능 분석에서 경년변화와 환경요인을 고려한 열관류율의 가중계수 제안

변지연(Ji Yeon Byun),박소민(So Min Park),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

The aims of this study is to propose the weighting factor of building thermal transmittance considering the elapsed year and building conditions. This method can relatively accurately predict the heat flow rate of the old building envelope by visual observation alone. Based on the on-site measurement of the thermal transmittance(Heat Flux Method) for a total of 39 old buildings, a weighting factor to correct the thermal transmittance by visual inspection was calculated. As a result of a regression analysis between the measured thermal transmittance and designed value, the type of exterior wall finishing material, color, and ambient climatic conditions actually affected the deterioration of the thermal performance of the wall.

띠모양 편평태선 1예

변지연 ( Ji Yeon Byun ),문경원 ( Kyoung Won Moon ),김성현 ( Seong Hyun Kim ),최혜영 ( Hae Young Choi ),명기범 ( Ki Bum Myung ),최유원 ( You Won Choi ) 대한피부과학회 2006 大韓皮膚科學會誌 Vol.44 No.9

ICT기업의 외국인지분율과 기업가치에 관한 연구

변지연(Ji-Yeon Byun),임인섭(In-Seob Im) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.4

본 연구는 ICT기업의 외국인지분율과 기업가치에 관한 연구로 외국인지분율이 기업가치에 미치는 영향을 분석하기 위하여 2011년부터 2018년까지 8개년 동안 KOSDAQ에 상장된 ICT기업 94개를 대상으로 752개의 표본을 이용하여 연구를 진행하였다. 연구결과, 외국인지분율이 증가할수록 기업가치가 증가하는 것으로 나타났다. 또한, 외국인지분율과 부채비율의 상호작용이 기업가치에 미치는 영향을 분석한 결과에서는 외국인지분율과 부채비율의 상호작용이 기업가치에 정(+)의 영향을 미치는 것으로 나타났다. 다만, 이러한 상호작용효과는 외국인지분율과 기업가치의 관계보다 통계적인 유의성이 떨어지는 것으로 나타났는데 이는 외국인 투자자들이 부채사용에 따른 감시 및 통제역할을 이미 어느 정도 수행하고 있기 때문에 외국인지분율과 부채비율의 상호작용효과가 상대적으로 작게 나타난 것으로 파악된다. This is a study on the relationships between foreign ownership and the firm value of Korean-listed ICT companies in the KOSDAQ market. The data based on 752 firm-year observations during the sample period from 2001 to 2018 was utilized to analyze the impact of foreign ownership in terms of the firm value. As a result of this analysis, more foreign ownership has positive effects on the firm value. An analysis of the effects of the interaction between foreign ownership and the debt ratio on the firm’s value found that the interaction between foreign ownership and debt ratio had a positive effect on the firm’s value. On the other hand, this interaction effect was less significant than the relationship between foreign ownership and the firm value. This is because foreign investors are already performing the role of monitoring and disciplining the use of debt to some extent. Therefore, the interaction effect was relatively small.

Educational Lecture 1-5 (EL 1-5) : Topical and systemic corticosteroids

변지연 ( Ji Yeon Byun ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1