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치과의원 내원환자가 평가한 치과 의료서비스 질과 관련 요인
연정미 ( Jeong Mi Yeon ),이태용 ( Tae Yong Lee ),민희홍 ( Hee Hong Min ) 한국치위생학회(구 한국치위생교육학회) 2012 한국치위생학회지 Vol.12 No.4
Objectives : This study purposed to identify factors related to dental service quality perceived by dental clinic patients, and for this purpose. Methods : The data conducted a questionnaire survey of 362 patients who had visited a dental clinic in Daejeon twice or more in August 2010 and aged over 20 during the period from the 1st to 31st of August 2010 and obtained results as follows. Results : The patients` general characteristics, perceived dental service quality was higher in older ones, married ones, high school or lower school graduates, civil servants, self-employed ones, and housewives, and the differences were statistically significant. according to the patients` dental clinic use characteristics, perceived dental service quality was higher when the stay in dental clinic was short, and the difference was statistically significant. Conclusions : Perceived dental service quality was related to the patients` general characteristics and dental clinic use characteristics. therefore, dentists and dental hygienists should make efforts to be more patient- oriented and to create pleasant dental care environment.(J Korean Soc Dent Hyg 2012;12(4):665-674)
RF 열플라즈마를 이용한 이차전지 음극재용 탄소나노실리콘복합소재 합성
이순직,김대신,연정미,박원규,신명선,최선용,주성후 한국재료학회 2023 한국재료학회지 Vol.33 No.6
To develop a high capacity lithium secondary battery, a new approach to anode material synthesis is required, capable of producing an anode that exceeds the energy density limit of a carbon-based anode. This research synthesized carbon nano silicon composites as an anode material for a secondary battery using the RF thermal plasma method, which is an ecofriendly dry synthesis method. Prior to material synthesis, a silicon raw material was mixed at 10, 20, 30, 40, and 50 wt% based on the carbon raw material in a powder form, and the temperature change inside the reaction field depending on the applied plasma power was calculated. Information about the materials in the synthesized carbon nano silicon composites were confirmed through XRD analysis, showing carbon (86.7~52.6 %), silicon (7.2~36.2 %), and silicon carbide (6.1~11.2 %). Through FE-SEM analysis, it was confirmed that the silicon bonded to carbon was distributed at sizes of 100 nm or less. The bonding shape of the silicon nano particles bonded to carbon was observed through TEM analysis. The initial electrochemical charging/ discharging test for the 40 wt% silicon mixture showed excellent electrical characteristics of 1,517 mAh/g (91.9 %) and an irreversible capacity of 133 mAh/g (8.1 %).