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커튼월 고층 건물 빛 반사에 의한 운전자 눈부심 가능성
송형준,서영교,Song, Hyung-Jun,Seo, Young Kyo 한국안전학회 2021 한국안전학회지 Vol.36 No.2
Buildings with glass curtain walls have become popular due to their appealing aesthetics and ability to let in natural light. However, light reflection from the glass surface is unavoidable in these buildings. In particular, the reflection of light from the glass envelope can create afterimage glare, a hazard to nearby drivers and pedestrians. Despite this potential danger, glare from buildings with curtain walls has not been well-studied. Hence, we analyzed the effect of light reflection on glare around a glass-enclosed skyscraper, depending on its surface reflectance. We investigated the potential hazard of glare to drivers using a commercially available software program. The results indicate that the direction of light reflection is distinctive when the incident angle of solar light increases. Moreover, this light reflection is high enough to induce an afterimage to drivers and pedestrians near the building. We found that keeping the reflectance of the building surface under 3% is required to minimize the afterimage hazard to drivers. Consequently, we recommend managing glass reflectance and installing additional traffic safety systems to reduce traffic accidents near curtain wall buildings.
송형준(Hyung Jun Song),김종원(Jong Won Kim),박준석(Jun Seok Park),김용석(Yong Seok Kim),최유신(Yoo Shin Choi),김범규(Beom Gyu Kim),차성재(Sung Jae Cha),박성준(Sung Jun Park),장인택(In Taik Chang),박성일(Sung Il Park),박언섭(Eon Sub P 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.1
Purpose: Postsurgical adhesion formation is a significant clinical problem within every surgical specialty. Several adhesion barriers have been developed in the form of solution, membrane or film in an attempt to solve these problems. The purpose of the present study is to compare the efficacy of antiadhesive agents in the prevention of postsurgical adhesion formation in a standardized rat adhesion model. Methods: We examined forty Sprague-Dawley rats, which is a cecal abrasion with partial peritonectomy model. Three treatment groups (Group Ⅰ: Film-type Surgiwrap<SUP>ⓡ</SUP>, Group Ⅱ: Solution-type Guardix-sol<SUP>ⓡ</SUP>, Group Ⅲ: Membrane-type Interceed<SUP>ⓡ</SUP>), each consists of 10 rats, and a control group of 10 rats were used by saline. Ten days after surgery, the rats were killed, and the levels of adhesion were graded. Immunohistochemical staining for microvessel density (CD34, MVD) and macrophage (ED1) were performed in adhesion tissue. Results: The peritoneum adhesion mean scores are as follows: control group: 2.2±0.78, Group Ⅰ: 1.0±1.06, Group Ⅱ: 0.9±0.99, Group Ⅲ: 0.6±0.84. All treatment groups showed significantly less peritoneum adhesion (P=0.006), while there was no significant difference in each group. The intraperitoneal organs adhesion mean scores are as follows: control group: 2.8±0.91, Group I: 2.6±1.06, Group Ⅱ: 1.4±0.84, Group Ⅲ: 1.0±0.81. Group Ⅰ had no significant difference about intraperitoneal organs adhesion with control group, but Group Ⅱ and Group Ⅲ showed less intraperitoneal organs adhesion. The mean numbers of microvessel density are as follows: control group: 42.5±4.83, Group Ⅰ: 40.8±6.53, Group Ⅱ: 30.9±6.15, Group Ⅲ: 15.60±4.37, from which there was a significant difference between Group Ⅱ and Group Ⅲ with control group (P<0.001). The mean numbers of macrophage are as follows: control group: 223.3±33.12, Group I: 211.25±10.96, Group Ⅱ: 171.60±23.96, Group Ⅲ: 147.0±12.22, from which there was a significant difference between Group Ⅱ and Group Ⅲ with control group (P<0.001). Conclusion: In our animal model, three different types of antiadhesive agents (Surgiwrap<SUP>ⓡ</SUP>, Guardix-sol<SUP>ⓡ</SUP>, Interceed<SUP>ⓡ</SUP>) were effective in adhesion prevention, but Surgiwrap<SUP>ⓡ</SUP> had less antiadhesive effect for intraperitoneal organs adhesion. Membrane-type Interceed<SUP>ⓡ</SUP> had a better effect for microvessel density (MVD) and macrophage than solution-type Guardix-sol<SUP>ⓡ</SUP>.
SnBiAg 전도성 페이스트를 이용한 Shingled 결정질 태양광 모듈의 전기적 특성 분석
윤희상,송형준,강민구,조현수,고석환,주영철,장효식,강기환,Yoon, Hee-Sang,Song, Hyung-Jun,Kang, Min Gu,Cho, Hyeon Soo,Go, Seok-Whan,Ju, Young-Chul,Chang, Hyo Sik,Kang, Gi-Hwan 한국재료학회 2018 한국재료학회지 Vol.28 No.9
In recent years, solar cells based on crystalline silicon(c-Si) have accounted for much of the photovoltaic industry. The recent studies have focused on fabricating c-Si solar modules with low cost and improved efficiency. Among many suggested methods, a photovoltaic module with a shingled structure that is connected to a small cut cell in series is a recent strong candidate for low-cost, high efficiency energy harvesting systems. The shingled structure increases the efficiency compared to the module with 6 inch full cells by minimizing optical and electrical losses. In this study, we propoese a new Conductive Paste (CP) to interconnect cells in a shingled module and compare it with the Electrical Conductive Adhesives (ECA) in the conventional module. Since the CP consists of a compound of tin and bismuth, the module is more economical than the module with ECA, which contains silver. Moreover, the melting point of CP is below $150^{\circ}C$, so the cells can be integrated with decreased thermal-mechanical stress. The output of the shingled PV module connected by CP is the same as that of the module with ECA. In addition, electroluminescence (EL) analysis indicates that the introduction of CP does not provoke additional cracks. Furthermore, the CP soldering connects cells without increasing ohmic losses. Thus, this study confirms that interconnection with CP can integrate cells with reduced cost in shingled c-Si PV modules.
사업장에 적용 가능한 감염병(COVID-19) 위험성평가 지표 개발
김하경,이명하,송형준,Kim, Ha Kyeong,Lee, Myoung Ha,Song, Hyung-Jun 한국안전학회 2022 한국안전학회지 Vol.37 No.2
Widespread infectious diseases are a concern for workers working in confined spaces. However, there is no risk assessment index for the risk of infectious disease in the workplace. Therefore, we propose a simple but effective index model to assess the risk of infectious diseases in the workplace. The proposed model identifies the risk of each workplace through an evaluation sheet comprising the frequency and intensity of the infectious disease. The intensity of an infectious disease is generally governed by the density of workers, whereas frequency is the sum of physical-e nvironmental and human management factors. By multiplying intensity and frequency, the risk of the workplace is derived. Through the proposed model, we evaluate the risks of workers at 15 different work sites. The proposed model clearly reveals what should be improved to keep workers safe from infectious diseases and will be helpful in assessing the risk of contagious disease at the work place.