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- 저자 : 신혜린(Hyerin Shin) (검색결과 4 건)
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서울시 지하철 2호선의 가을철 객실 PM<sub>2.5</sub> 농도의 특성
신혜린,정현희,이기영,Shin, Hyerin,Jung, Hyunhee,Lee, Kiyoung 한국환경보건학회 2019 한국환경보건학회지 Vol.45 No.2
Objectives: Subway is one of the most common transportation modes in Seoul, Korea. The objectives of this study were to determine characteristics of in-cabin $PM_{2.5}$ concentration in Seoul Metro Line Number 2 and to identify factors of the $PM_{2.5}$ concentration. Methods: In-cabin $PM_{2.5}$ concentrations in Seoul Metro Line Number 2 were measured using real-time monitors and the factors affecting $PM_{2.5}$ concentration in cabin were observed. Linear regression analysis of in-cabin $PM_{2.5}$ concentration and indoor/outdoor (I/O) ratio were performed. Results: In-cabin $PM_{2.5}$ concentration was associated with the in-cabin $PM_{2.5}$ concentration in previous station. In-cabin $PM_{2.5}$ concentration was correlated with ambient $PM_{2.5}$ concentration and associated with underground station with control of the in-cabin $PM_{2.5}$ concentration in previous station. I/O ratio increased as the number of passengers increased and when passing through the underground station with control of I/O ratio in previous station. Conclusion: In-cabin $PM_{2.5}$ concentration was affected by ambient $PM_{2.5}$ concentration. Therefore, management of in-cabin $PM_{2.5}$ concentrations should be based on outdoor air quality.
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최신 교정치료에서의 Skeletal Temporary Anchorage Devices (TADs)의 적용과 해부학적 고려사항
한성호(Seong Ho Han),신혜린(Hyerin Shin),박영석(Young-Seok Park) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.9
In contemporary orthodontic treatment skeletal temporary anchorage devices (TADs) are routinely used as an anchorage reinforcement to provide improved anchorage control with reduced requirement for patient’s compliance. For past few decades, various types of TADs have been explored and their clinical application has been expanded. Therefore, the purpose of this article is to present three major types of orthodontic skeletal anchorage devices and discuss their rationale, clinical procedure, insertion site, and potential complications as well as their management.
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곽수영(Sooyoung Guak),임미영(Miyoung Lim),신혜린(Hyerin Shin),박지영(Ji Young Park),이기영(Kiyoung Lee) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.3
Objectives: The purpose of this study was to determine skin adhesion rate of children’s modeling clay for exposure assessment. Methods: Children’s modeling clays were classified into 10 categories as PVA clay, PVA soft clay, starch-based clay, foam clay, rubber clay, oil clay, muddy clay, terra clay, paper clay and slime. A total of 26 children’s clay goods was selected. Moisture content (%) and hardness of clays were measured. Five adults aged 20 to 25were recruited for experiment. Gravimetric difference of modeling clay was determined after 3 minutes playing time. Skin adhesion rate (g/min/cm2) was estimated bythe amount of skin adhesion per minute (g/min) and each individual’s palm surface area (cm2). Results: Twenty four of the 26 children’s modeling clay products were adhesive to skins. Two products of foam and rubber clay were not adhered to skin. For the 24 products, the average skin adhesion rate was 5.5×10 -4± 4.0×10 -4 g/min/cm 2 . The highest skin adhesion rate was 1.3×10 -3±4.4×10 -4g/min/cm 2 for paper clay. The lowest skin adhesion rate was 4.6×10 -5 ±1.1×10 -4g/min/cm 2 for oil clay. The skin adhesion rate was increased with increase of moisture content. Adhesion rates of some clays were varied by person and testing trials. Conclusion: The study determined skin adhesion rate of children’s modeling clay. The adhesion rate is useful for exposure and risk assessments and setting safety guideline to protect children’s health.
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Determinants of Indoor PM<SUB>2.5</SUB> Concentrations in Ger, a Traditional Residence, in Mongolia
Ju Young Ahn(안주영),Lim Song(송림),Hyerin Shin(신혜린),Wongeon Jung(정원건),Chimedsuren Ochir,Kiyoung Lee(이기영) 서울대학교 보건환경연구소 2018 보건학논집 Vol.55 No.2
Objectives: Use of coal by residents of ger, the traditional Mongolian residence, is a major cause of increasing indoor PM<SUB>2.5</SUB> concentrations. While high-level of indoor PM<SUB>2.5</SUB><SUB></SUB> concentrations of ger have been reported in the previous studies, the contributions of daily activities, such as indoor coal burning, cooking and smoking to the indoor PM<SUB>2.5</SUB> concentrations have not been clearly determined. The aims of this study were to determine the factors of indoor PM2.5 concentration in ger and to quantify the effect of them on both average and real-time indoor PM<SUB>2.5</SUB> concentrations. Methods: PM<SUB>2.5</SUB> concentrations of gers and dwellings were measured in winter over three years. During the measurement, information of residents’ indoor activities were observed. Multiple regression was carried out with daytime average indoor PM2.5 concentration as a dependent variable. In order to determine the effect of indoor activities on real-time indoor PM<SUB>2.5</SUB> concentration, the peak analysis was performed. Results: Indoor PM<SUB>2.5</SUB> concentration and I/O ratio were significantly higher in gers than dwellings. Outdoor PM<SUB>2.5</SUB> concentration and indoor smoking were significant factors affecting daytime average of indoor PM<SUB>2.5</SUB> concentration in gers. Daily activity factors were associated with real-time PM<SUB>2.5</SUB> concentration - average peak magnitude of 224.3 μg/m3 occurred with fuel addition, 260.1 μg/㎥ with cooking, and 407.7 μg/㎥ with indoor smoking. Conclusion: Indoor PM<SUB>2.5</SUB> concentration of ger was extremely high, even more than dwellings in adjacent area. The indoor smoking and outdoor air pollution affected average indoor PM<SUB>2.5</SUB> concentration in ger. Daily activities of residents of ger such as fuel usage, cooking and smoking increased indoor PM<SUB>2.5</SUB> concentration in a short time.
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