ITO 박막이 증착된 편광판을 기판으로 하는 액정 셀의 제작

진혜정,김기한,박경호,손필국,김재창,윤태훈,Jin, Hye-Jung,Kim, Ki-Han,Park, Kyoung-Ho,Son, Phil-Kook,Kim, Jae-Chang,Yoon, Tae-Hoon 한국광학회 2011 한국광학회지 Vol.22 No.2

본 논문에서는 액정 디스플레이의 구현에 있어서 필수적인 필름인 편광판에 ITO를 증착하여 기존 액정 디스플레이에서 두께의 대부분을 차지하는 유리기판을 제거함으로써 경략 박형 액정 셀을 구현하였다. 저온($40^{\circ}C$)에서 편광판에 sputtering으로 buffer layer와 ITO를 증착하여 높은 투과율과 낮은 비저항 및 편평도를 확보하였다. 최종적으로 저온공정이 가능한 ion-beam 배향법을 이용하여 액정을 배향하고 액정 셀을 제작하고 전기광학특성을 확인하였다. We propose a super-thin and light-weight liquid crystal cell, in which glass substrates are eliminated and polarizers are used as substrates. We fabricate a polarizer substrate by depositing a-SiOX as a buffer layer, indium-tin-oxide as a transparent conducting layer, and a-SiOX as an alignment layer on a polarizer sequentially at a low temperature. We use the ion-beam method to align liquid crystals on polarizer substrates.

폴리머 네트워크가 형성된 TN 액정셀의 고속응답 특성

진혜정,김기한,백종인,김재창,윤태훈,Jin, Hye-Jung,Kim, Ki-Han,Baek, Jong-In,Kim, Jae-Chang,Yoon, Tae-Hoon 한국광학회 2010 한국광학회지 Vol.21 No.2

본 논문에서는 광학적으로 비등방성인 폴리머를 이용하여 $90^{\circ}$ TN(Twisted Nematic) 액정셀의 응답시간을 향상시키는 방법을 제안하였다. 액정과 비등방성 폴리머를 일정 비율로 혼합하여 TN 액정셀에 주입한 뒤 UV를 조사하여 폴리머 네트워크를 형성시킴으로써 투과율에 영향을 주지 않고 응답시간을 향상시킬 수 있다. 폴리머 네트워크가 형성되지 않은 TN 액정셀의 turn-off 시간이 16 ms인데 반해 제안된 방법에서는 액정과 비등방성 폴리머의 혼합 비율이 3, 5, 10 wt%로 증가할 때 12, 11, 9 ms로 고속 turn-off가 구현될 수 있다. 또한, turn-off 동작 시 TN 액정셀에서 발생하였던 delay time과 backflow가 폴리머 네트워크의 형성에 의해 크게 개선됨을 확인하였다. We propose a method to enhance the response time of a twisted nematic liquid crystal (TN-LC) cell using an anisotropic polymer. Polymer networks are formed by the phase separation between a LC and a UV-curable polymer. A TN-LC cell is exposed to UV light after the mixture of LC and anisotropic polymer is injected into the TN-LC cell. As a result, turn-off time of a TN-LC cell can be decreased remarkably without any loss of the transmittance. The turn-off time of a TN-LC cell with pure LC was 16 ms, but those of polymer networked TN-LC cells were 12, 11, and 9 ms when the concentration of the polymer was 3, 5, and 10 wt%, respectively. Moreover, by virtue of the polymer network, the backflow effect and the delay time generated during the turn-off process disappeared.

어린이에서 치과용 아말감과 요중 수은 축적 농도의 관련성

진혜정 ( Hye Jung Jin ),사공준 ( Joon Sakong ),최연희 ( Youn Hee Choi ),안서영 ( Seo Young An ),이영은 ( Young Eun Lee ),송근배 ( Keun Bae Song ) 대한예방치과·구강보건학회 2011 大韓口腔保健學會誌 Vol.35 No.3

Objectives. Dental amalgam consists of approximately 50% mercury, which is a toxic element. Since children are more at risk for mercury toxicity, we aimed to assess the association between dental amalgam filling and urinary mercury concentration in children. Methods. Four hundred eighty four elementary school children in grades 1∼4 were conveniently recruited from two schools located in Daegu city, Korea. Oral examination were conducted to obtain dental caries experience states using the full term for DFS index, number of amalgam filling surfaces and the type of filling materials. A questionnaire was used to collect information about general characteristics and the frequencies of tooth brushing, gum chewing and fish/seafood consumption. The statistical analysis was done using the SPSS 18.0 program. Results. The mean urinary mercury concentration in children having eight amalgam surfaces was highest at the level 4.26μg/L. The level of urinary mercury in children with 6∼10 amalgam fillings and more than 11 amalgam surfaces was significantly higher than in those having no amalgam after adjusting for other covariates. Conclusions. Children exposed to more dental amalgam may be prone to an increased urinary mercury level.

한국 청소년의 위생습관 중 잇솔질과 손 씻기의 연관성

진혜정 ( Hye Jung Jin ),이영은 ( Young Eun Lee ),안상헌 ( Sang Hun Ahn ),진명욱 ( Myoung Uk Jin ),최순례 ( Soon Lye Choi ),송근배 ( Keun Bae Song ),최연희 ( Youn Hee Choi ) 한국치위생학회(구 한국치위생교육학회) 2013 한국치위생학회지 Vol.13 No.1

Objectives: The aim of this study was to evaluate the relationship between the hand washing management and tooth brushing frequency. Methods: The subjects in this study were 7,285 adults who were selected from the third-year(2009) raw data of the fourth national health & nutrition survey. Results: The mean frequency of daily toothbrushing was 3.35. Increases the frequency of both toothbrushing and hand washing with higher grade class. The higher the tooth brushing frequency, the intention of hand washing management at school and home was more increased. Conclusions: This study can contribute to the general health and oral health promotion.

치주질환상태 측정을 위한 자기기입식 설문도구의 타당성과 신뢰성

진혜정 ( Hye Jung Jin ),배광학 ( Kwang Hak Bae ),김진범 ( Jin Bom Kim ),박덕영 ( Deok Young Park ),정성화 ( Seong Hwa Jeong ),김백일 ( Beak Il Kim ),정승화 ( Seung Hwa Jeong ),임상욱 ( Sang Uk Im ),최연희 ( Youn Hee Choi ) 대한예방치과·구강보건학회 2014 大韓口腔保健學會誌 Vol.38 No.3

Objectives: The purpose of this study was to develop a self-administered questionnaire survey to determine its validity and reliability as well as to improve the instructions for measurement of periodontal disease during oral examination for reliably calculating the prevalence of periodontal disease. Methods: The data obtained was analyzed using SPSS 20.0 and the WINSTEPS program that employs the Rasch model to evaluate validity and reliability of the instrument. Results: We developed a self-administered questionnaire survey consisting of 14 questions based on NHANES. We confirmed the reliability by testing and re-testing the questionnaire survey using selfadministered methods. The average Kappa index obtained was 0.73, which indicated a relatively high reliability. Conclusions: Reliability and validity of the self-administered assessment tool for periodontal disease developed for the local situation/circumstances of Korea is suitable to be applied for oral examination of a large population. Moreover, the questionnaire survey for periodontal disease could be used to acquire data for constructing a database for oral health policy development.

소아,청소년의 대사증후군과 치은건강의 관련성

진혜정 ( Hye Jung Jin ),최연희 ( Youn Hee Choi ),이상규 ( Sang Gyu Lee ),송근배 ( Kean Bae Song ),이희경 ( Hee Kyung Lee ),권호장 ( Ho Jang Kwon ),김형규 ( Hyung Gyoo Kim ) 대한예방치과·구강보건학회 2010 大韓口腔保健學會誌 Vol.34 No.4

Objectives. Metabolic syndrome (MS) is becoming a common disorder worldwide. Preventing metabolic syndrome is important because the presence of multiple MS components increases the risk of developing cardiovascular diseases. In this cross-sectional study, we aimed to assess the association of between MS and gingivitis in youth. Methods. A total of 947 subjects (513 boys and 432 girls) who underwent medical and dental checkups with all MS components was final sample size from data analysis from the fourth Korea National Health and Nutrition Examination Survey. We examined the relationship between each component and the number of positive components of MS (central obesity, hypertriglyceridemia, low high-density lipoprotein-cholesterol, hypertension, insulin resistance) and gingivitis status using the Community Periodontal Index. The logistic regression models were build odds ratios (ORs) and 95% confidence intervals (CIs) were calculation using SPSS 17.0 program. Results. Of the five components of MS, low HDL cholesterol level and high blood pressure were each significantly related with having gingivitis. Logistic regression analysis for full model including all metabolic syndrome components and other risk factors the OR for low HDL-cholesterol was 1.52 significantly and the OR for high blood pressure was 1.38. Conclusions. Gingivitis was positively associated with MS in Korean, suggesting that further studies should be needed to investigate causal relationship.

어린이에서 구강내 아말감 제거 후 요중 수은농도 변화

진혜정 ( Hye Jung Jin ),사공준 ( Joon Sa Kong ),송근배 ( Keun Bae Song ),전은숙 ( Eun Suk Jeon ),김기림 ( Ki Rim Kim ),최연희 ( Youn Hee Choi ) 한국치위생과학회 2015 치위생과학회지 Vol.15 No.2

The objective of this study is to estimate the relationship between amalgam removal and urinary mercury levels. To measure urinary mercury concentration, urine of participants was collected at baseline, immediately, 24 hours and 48 hours after removal of amalgam restorations. The statistical analysis was performed using IBM SPSS Statistics ver. 20.0. The overall mean urinary mercury concentration at baseline, immediately, 24 hours and 48 hours after removal of amalgam restorations was 2.77, 2.75, 2.95 and 4.00 mg/g creatinine, respectively. Logistic regression model shows that the gender leads to increased odds of high urinary mercury concentration in children (odds ratio, OR=1.99), even after adjusting for high amalgam surfaces (OR=1.23) and fish consumption (OR=1.26) at the baseline. Our findings suggest that mercury exposure from dental amalgam adversely impact health and therefore are a health risk.

장애인의 미충족 치과치료 실태조사

진혜정(Jin, Hye-Jung) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.11

이 연구는 장애인 대상 치과진료 필요자 중 치과의료 서비스 미충족율과 그 이유를 조사하고, 미충족 치과치료에 따른 구강상태를 분석하였다. 국민건강영양조사 참여 대상 중 만 19세 이상 장애등록 응답자 444명을 선정하였고, 그 중 구강검진과 설문조사를 완료한 대상자 375명을 최종분석하였다. 장애유형은 6종류(지체장애, 뇌병변장애, 감각장애, 발달 장애, 정신장애, 내분비장애)로 분류하였다. 연구대상자 중 미충족 치과치료 대상자는 128명이었으며, 최근 1년 동안 치과 진료를 받지 못한 가장 주된 이유는 ‘경제적인 이유로’에 대한 항목이 49.2%으로 가장 많았으며, ‘다른 문제에 비해 덜 중요하다고 느껴서’에 대한 항목이 18.0%이었다. 치주질환과 영구치우식경험을 가진 장애인 중 미충족 치과치료 빈도와 진행정도가 높은 것으로 확인하였다. 치과진료 자원의 가용성 측면에서 장애인 수 대비 적절한 치과진료 서비스를 충분히 제공하여 치과진료 서비스의 원활한 이용이 요구된다. This study analyzed the rate of unmet dental care service for the disabled who were judged to require the dentistry due to oral health-related problems and those reasons, and also examined the oral health status according to the unmet dentistry. 375 subjects, who were 19 years or older and completed oral health examination and a survey, among 444 responded positive of disability registration after participation in National Health and Nutrition Examination Survey(NHANES), were analyzed. Disability type was classified into 6 kinds(physical disability, brain lesions, sensory defect, developmental disability, mental disorder, endocrine disorder). Participants had 128 of their dental care needs unmet when it was required. ‘Financial burden’ was the main reason, with the subject of 49.2%, followed by ‘lower on the priority scale’ were 18.0%. The high frequency and progression permanent teeth caries experiencs and periodontal status of their dental disease were confirmed. In availability aspect of dentistry resources, it is required for using dentistry service smoothly through providing sufficient proper dental care service comparing with the number of the disabled.

치주건강과 만성폐쇄성폐질환의 관련성

진혜정 ( Hye Jung Jin ),김은경 ( Eun Kyong Kim ),안서영 ( Seo Young An ),임상욱 ( Sang Uk Im ),송근배 ( Keun Bae Song ),최연희 ( Youn Hee Choi ) 대한예방치과·구강보건학회 2013 大韓口腔保健學會誌 Vol.37 No.3

만성폐쇄성폐질환은 높은 유병률과 사망률임에도 불구하고 과소 진단되고 있는 질병이다. 이 연구에서는 국민건강영양조사를 이용하여 우리나라 성인을 대상으로 치주질환과 만성폐쇄성폐질환의 관련성을 파악하여 구강위생을 통한 치주건강을 향상시킴으로써 만성폐쇄성폐질환 악화를 예방하기 위한 기초자료를 마련하고자 하였으며, 다음과 같은 결론을 얻었다. 1. 연구대상자의 치주상태에 따른 분포에서 폐기능정상군에서 치석형성치주조직을 가진 대상자가 42.3%로 가장 높게 나타났으며, 천치주낭형성치주조직을 가진 대상자가 24.1%, 심치주낭형성치주조직을 가진 대상자가 6.3%로 나타났으며, 만성폐쇄 성폐질환군에서도 치석형성치주조직을 가진 대상자가 31.5%, 천치주낭형성치주조직을 가진 대상자가 28.8%, 심치주낭형성치주 조직을 가진 대상자가 13.3% 순으로 나타났다. 2. 로지스틱 회귀분석한 결과, 건전치주조직을 가진 대상자에 비해 천치주낭형성치주조직 대상자의 만성폐쇄성폐질환 위험비는 0.79배(95% CI=0.50, 1.25)로 나타났으며, 심치주낭형성치주조직 대상자의 만성폐쇄성폐질환 위험비는 1.18배(95% CI=0.63, 2.21)로 치주질환과 만성폐쇄성폐질환과는 관련성이 없는 것으로 나타났다. 3. 흡연상태를 층화시켜 분석한 결과, 심치주낭형성치주조직대상자의 만성폐쇄성폐질환을 가질 위험비는 흡연자에서 0.92배(95% CI=0.41, 2.05), 비흡연자에서 1.29배(95% CI=0.64, 2.59)로 나타났지만 통계적으로 유의하지 않았다. Objectives: The aim of this study was to examine the relationship between periodontal health and chronic obstructive pulmonary disease (COPD) in a Korean population. Methods: The Community Periodontal Index (CPI) data of 7,264 subjects, aged over 25 years, who participated in the Fourth Korea National Health and Nutrition Examination Survey was used to assess the periodontal status of the population. Severity of COPD in the subjects was classified according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD) definition. Results: Subjects with more severe COPD were more likely to have severe periodontal disease. After adjustment for gender, age, monthly income, education, economic activity, and occupation, the odds ratio of COPD was 1.18 (95% Confidence interval [CI], 0.63-2.21) for severe periodontal disease in the study sample. When stratified by smoking status, the odds ratio of current smokers was 0.92 (95% CI, 0.41-2.05) and that of non-smokers was 1.29 (95% CI, 0.64-2.59). Conclusions: Periodontal health was not significantly related to the severity of the COPD, even though smoking was a common risk factor. This is the first study examining the relationship between periodontal health and COPD in a Korean population. Studies that further investigate the causal relationship between the two are recommended.

자기기입식 설문도구의 치주염 진단 가능성 평가

진혜정 ( Hye Jung Jin ),김백일 ( Beak Il Kim ),박덕영 ( Deok Young Park ),정성화 ( Seong Hwa Jeong ),배광학 ( Kwang Hak Bae ),김진범 ( Jin Bom Kim ),정승화 ( Seung Hwa Jeong ),이혜린 ( Hye Rin Lee ),우경지 ( Gyeong Ji Woo ),최연희 대한예방치과·구강보건학회 2015 大韓口腔保健學會誌 Vol.39 No.1

Objectives: The present study aimed to evaluate the validity of a set of self-reported questionnaires for periodontitis for estimating the prevalence of chronic adult periodontitis in the Korean population. Methods: The questionnaire is comprised of a total of 14 questions with four summarized concepts including self-diagnosis of oral status, subjective signs related to oral health, smoking and drinking status, and use of auxiliary oral hygiene devices including scaling. The predictiveness of the measures from these self-reported questions was assessed by logistic regression modeling using receiver operating characteristic (ROC) statistics, sensitivity, and specificity. Results: The sensitivity, specificity, and AUC including all questions were 0.571, 0.768, and 0.781, respectively; the sum of sensitivity and specificity was 1.34. To gain robustness, a simplified predictive model was built with six questions. Its results were 0.536, 0.817, and 0.762 for sensitivity, specificity, and AUC, respectively. The sum of sensitivity and specificity was found to be 1.35. Conclusions: The self-reported questionnaire for periodontitis showed considerable validity, but further study is required to provide optimal validity and predictability.