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Improvement of Thermoelectric Performance of PEDOT by Controlling Counter-Ion-Induced-Disorder
주덕현,김지민,조길원 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this work, we quantified the structural and energetic disorder caused by counter–ions in poly(3,4-ethylenedioxythiophene) (PEDOT), and investigated how the disorder affects charge transport in thermoelectric generators (TEGs). Different counter-ions localized charge carriers differently, and therefore changed the degree of disorder in PEDOT. These changes affected in several qualities, including crystallinity, polaron behaviors, and density of states (DOS) of the PEDOT. The localization of charge carriers in PEDOT that had a high degree of disorder changed the PEDOT planarity, the characteristics of polarons, and the broadness of DOS. These changes resulted in opposite behaviors in the electrical conductivity and the See beck coefficient in PEDOT in response to the extent of disorder, and thereby yielded a high figure of merit ZT of 0.21 in PEDOT that had the lowest degrees of the disorder.
국내 라돈 취약가구에 대한 주거공간의 실내 라돈 농도에 관한 연구
주덕현,박기호,정희원,임형준,복동석,윤동원,민경환,문경덕,김정운,이지민,최원용,김성윤,Zoo, Duck Hyun,Park, Ki Ho,Jeong, Hui Won,Lim, Hyeong Jun,Bok, Dong Seok,Yun, Dong Won,Min, Kyung Hwan,Mun, Kyung Deok,Kim, Jeong Un,Lee, Ji Min,Choi, W 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.2
Objectives: The purpose of this research was to examine radon exposure in terms of the relationship between the living environment and indoor radon concentrations among vulnerable households. Methods: Nationwide, 1,129 subjects were selected using personal questionnaires for adequately understanding the living environment, installation of E-PERM radon gas detectors, and investigation of the structure of the housing. Results: The mean concentration of indoor radon for all subjects was $130.2Bq/m^3$ (GM=101.7), and a total of 438 subjects (38.8%) exceeded the recommended standards ($148Bq/m^3$) for public facilities by the Ministry of the Environment. By location, the highest concentrations ($164.3Bq/m^3$, GM=124.1) were seen in North Chungcheong Province. In the case of the Seoul/Gyeonggi Province metropolitan area, they showed $125.6Bq/m^3$ (GM=105.1) and $118.9Bq/m^3$ (GM=96.5), respectively. By type of housing, indoor radon concentrations in single-family housing were higher than in row/multi-family housing (p<0.01). Although indoor radon concentrations raised in accordance with year of construction (p<0.05), the difference between indoor radon concentrations in underground residences was not observed to be statistically significant (p=0.633). Conclusion: More studies are necessary in the future regarding the difference in indoor radon concentrations that may occur due to different of types of indoor construction, building materials, and the amount of building materials.
안승철,김대선,유화연,권영민,주덕현,Ahn, Seung-Chul,Kim, Dae-Seon,Yu, Hwa-Yon,Kwon, Young-Min,Zoo, Duck-Hyun 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.5
Objectives: In order to investigate the relation between environmental pollution and its effect on human health in large-scale industrial complex regions, monitoring studies have been conducted since 2003. The main purpose of this Gangneung study is to produce background data which can be compared with several large-scale industrial complex regions such as Ulsan, Sihwa, Banwol, Gwangyang, Yeosu, Pohang and Cheongju Daesan industrial complexes. Methods: In this Gangneung study, 1,007 local residents were recruited and the framework of this study was designed to evaluate and monitor health effects associated with low-level but long-term exposure to environmental pollutants. A survey was performed based on personal questionnaires, medical check-ups, and allergy skin prick tests for twelve common allergens. The authors reviewed the prevalence rate of skin allergens in Gangneung compared with in large-scale industrial areas. The results are summarized as follows. Results: The diagnosis prevalence and medical treatment prevalence of asthma were lower than in industrial complex regions, but allergic rhinitis was higher. The allergy skin test prevalence was 26.0% and the most common allergens were dust mites (D. pteronysinus 16.7% and D. farinae 16.3%). Conclusions: The positive findings of the skin prick test were similar with large-scale industrial complex regions in Korea. Further study is required to find the cause of the regional differences in skin prick prevalence.