(Pb_0.72La_0.28)Ti_0.94O₃ Buffer를 사용한 Pb(Zr_0.52Ti_0.48)O₃ 박막의 수소 후열처리 효과

이은선,이동화,정현우,임성훈,이상렬,Lee, Eun-Sun,Li, Dong-Hua,Chung, Hyun-Woo,Lim, Sung-Hoon,Lee, Sang-Yeol 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.4

Pb(Zr/sub 0.52/Ti/sub 0.48/)O₃(PZT) thin films were deposited by using a pulsed laser deposition method on a Pt/Ti/SiO₂/Si substrate with (Pb/sub 0.72/La/sub 0.28/)Ti/sub 0.93/O₃ (PLT) buffer and on a Pt/Ti/SiO₂/Si substrate without buffer. These films were annealed in H₂-contained ambient for 30 minutes at the substrate temperature of 400。C to evaluate the forming gas annealing effects. The comparative studies on the ferroelectric properties of these two films were carried out, which are shown that ferroelectric properties, such as remanent polarization didn't change in the case of PLT buffered PZT film while remanent polarization value of PZT film degraded from 20.8 C/㎠ to 7.3 C/㎠. The leakage current became higher in both cases, but that of the more-oriented PZT film had the moderate value of the 10/sup -6/ order of A/㎠. This is mainly because the hydrogen atoms which make the degradation of PZT films cannot infiltrate into the more -oriented PZT film as well as the less-oriented PZT film.

측방 접근법을 이용하여 상악동 거상술을 시행한 부위에 식립한 임플란트의 생존율에 대한 후향적 연구

이은선,안용범,이원진,김형섭,Lee, Eun-Sun,Ahn, Yong-Bum,Lee, Won-Jin,Kim, Hyung-Seop 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.4

Purpose: Osseointegration of implants in patients with pneumatized maxillary sinuses is difficult to achieve due to the deficiency of available bone in the posterior maxilla after loss of teeth. Maxillary sinus elevation is a method to overcome this problem. In this study, we evaluated the implant survival rate and the relationship between implant survival in patients with sinus elevation by the lateral approach. Materials and Methods: A total of 48 patients were consecutively treated with sinus elevation by the lateral approach between February 2003 & August 2006 at the dental hospital of Chonbuk National university. A total of 113 implants were placed. The mean healing period was 7.1 months and implants were placed after a mean period of 5.6 months. The mean observation period was 21.8 months. Results: Out of the 113 implants placed, fifteen failed, resulting in a survival rate of 86.7%, 18 cases of sinus membrane perforation were observed out of 65 sinuses treated. 33 implants were placed in a perforated site and 10 failed, representing a 60.7% implant survival. 80 implants were placed in a nonperforated site and 5 failed, representing a 92.6% implant survival. Conclusions: Implant placement with sinus elevation is an acceptable treatment for short term results. Sinus membrane perforation and postoperative complications, however, may have an effect on implant failure.

일축 압축하중 하 다공성 폴리우레탄폼의 재료비선형 거동 및 미세구조 변화

이은선,고태식,이치승,Lee, Eun Sun,Goh, Tae Sik,Lee, Chi-Seung 한국재료학회 2017 한국재료학회지 Vol.27 No.12

Porous materials such as polymeric foam are widely adopted in engineering and biomedical fields. Porous materials often exhibit complex nonlinear behaviors and are sensitive to material and environmental factors including cell size and shape, amount of porosity, and temperature, which are influenced by the type of base materials, reinforcements, method of fabrication, etc. Hence, the material characteristics of porous materials such as compressive stress-strain behavior and void volume fraction according to aforementioned factors should be precisely identified. In this study, unconfined uniaxial compressive test for two types of closed-cell structure polyurethane foam, namely, 0.16 and $0.32g/cm^3$ of densities were carried out. In addition, the void volume fraction of three different domains, namely, center, surface and buckling regions under various compressive strains (10 %, 30 %, 50 % and 70 %) were quantitatively observed using Micro 3D Computed Tomography(micro-CT) scanning system. Based on the experimental results, the relationship between compressive strain and void volume fraction with respect to cell size, density and boundary condition were investigated.

한국 청소년의 스트레스와 구취의 관련성

이은선 ( Eun-sun Lee ),도경이 ( Kyung-yi Do ) 한국치위생학회 2022 한국치위생학회지 Vol.22 No.2

Objectives: The purpose of this study was to examine the relationship between stress and halitosis in a representative sample of Korean adolescents. Methods: This study was based on the 15th Korea Youth Risk Behavior Survey (2019). The final participation rate in the survey was 95.3%; 57,303 out of 60,100 (95.3%) adolescents aged 13-18 years were selected. Multiple logistic regression with complex samples was performed to identify the correlation between stress and halitosis. Stress level was classified as ‘very much’, ‘a little’, and ‘not much’ and halitosis was defined as the presence of an unpleasant odor in the oral cavity. Results: The prevalence of halitosis among students was 21.3%. As a result of multiple regression analysis, the ‘a little’ [odds ratio (OR); 1.39, 95% confidence interval (CI); 1.29-1.49] and ‘very much’ stress group (OR; 1.78, 95% CI; 1.66-1.90) exhibited significantly higher risk of halitosis than the ‘not much’ stress group. Conclusions: A significant correlation between stress and halitosis exists among Korean adolescents. Therefore, psychological factors such as stress should be considered in managing halitosis in adolescents.

치주질환과 만성신장질환의 연관성: 코호트 연구에 대한 체계적 고찰

이은선 ( Eun-sun Lee ),도경이 ( Kyung-yi Do ) 한국치위생과학회 2017 치위생과학회지 Vol.17 No.2

본 연구는 치주질환과 신장질환의 연관성을 알아보기 위한 체계적 고찰이다. Embase, PubMed, The Cochrane Library데이터베이스에서 2016년 4월 17일 검색을 완료하였다. 문헌의 선택은 코호트 연구 설계를 기준으로 하였으며, 환자군은 치주질환 또는 중증의 치주질환이 있는 대상자로 하였다. 최종 결과는 만성신장질환의 발생이나 신장기능의 저하로 eGFR을 제시한 연구로 하였다. 최종 선정된 문헌의 양적합성을 위하여 Review Manager (RevMan) 통계 분석 소프트웨어를 이용하였다. 고정효과모형 멘텔-헨젤 방법(M-H)을 이용하여 메타분석을 시행하여 치주질환과 만성신장질환의 연관성을 추정하였다. 검색 전략을 이용하여 총 3,018개의 문헌이 검색되었고, 그 중 4개의 문헌이 최종 분석에 포함되어 메타 분석한 결과 치주질환이 만성신장질환 발생위험과 유의한 연관성이 있음이 나타났다(OR, 1.65; 95%CI, 1.44∼1.90; p<0.001). 만성신장질환 발생 및 신장기능저하를 예방하기 위해서는 개인의 삶의 질 저하와 의료비용부담을 줄이기 위해 기존에 알려진 전통적 위험인자 외에 만성신장질환에 영향을 미치는 치주질환의 예방 및 관리의 필요성이 크다. The purpose of this systematic review was to investigate the association between periodontal disease and chronic kidney disease. A search of Embase, PubMed and The Cochrane Library databases was performed up to April 17, 2016. Article selection was based on cohort study design and the study subjects were patients with periodontal disease or severe periodontal disease. The final result was development of chronic kidney disease and kidney function decrease based on the estimated glomerular filtration rate values. The quantitative synthesis of the final selected articles was assessed using Review Manager statistical analysis software. A fixed-effects model meta-analysis was performed to estimate the degree of association between periodontal disease and chronic kidney disease. The search strategy identified 3,018 potentially eligible articles, of these, four studies were finally selected for meta-analysis, revealing that periodontal disease was significantly associated with the risk of developing chronic kidney disease (odds ratio, 1.65; 95% confidence interval, 1.44∼1.90; p<0.001). In order to prevent the development of chronic kidney disease and kidney function decrease it is important to prevent periodontal disease, as well as minimizing the traditional risk factors known to reduce the quality of life of patients and increase disease burden.

국제화시대 한국교육의 "무한경쟁주의" 극복을 위한 인문학적 성찰

이은선 ( Eun Sun Lee ) 한국교육철학학회(구 교육철학회) 2008 교육철학연구 Vol.41 No.-

효율적 객체정보 검출을 위한 다중색상 정규화

이은선(Eun-Sun Lee),김상훈(Sang-Hoon Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅱ

본 연구에서는 영상안에서의 중요한 객체정보를 검출하기 위한 전처리 과정으로 효율적인 색상정보 정규화에 의한 영역분석 방법을 제안한다. 다중색상 정규화는 기존의 화소내 색상성분간의 정규화와 모든 화소에 대한 성분별 정규화를 복합적으로 사용함으로써, 객체의 영역들이 갖는 고유 생상성분의 분포를 좀더 특징 공간에 집중시키고 영상분할을 용이하게 한다. 이러한 방법의 효과를 입증하기 위해 가상의 입력영상을 제작하여 기존의 알고리즘과 본 논문에서의 방법을 함께 적용, 비교평가한다.

서울시 지하철 2호선 본선구간의 입자상물질 농도 특성 및 미세분진의 오염지도 개발

이은선(Eun-Sun Lee),박민빈(Min-Bin Park),이태정(Tae-Jung Lee),김신도(Shin-Do Kim),박덕신(Duck-Shin Park),김동술(Dong-Sool Kim) 한국대기환경학회 2016 한국대기환경학회지 Vol.32 No.2

최근 한국 복음주의 운동 ; 한국 복음주의 신학의 최근 동향

이은선 ( Eun Sun Lee ) 현대기독교역사연구소 2009 성결교회와 신학 Vol.22 No.-

국내 사회적기업 조직군의 특성: 정책의 결과인가, 경쟁의 결과인가?

이은선 ( Eun Sun Lee ) 한국정책학회 2015 韓國政策學會報 Vol.24 No.4

본 연구는 국내 사회적기업 조직군에서 일자리제공형 사회적기업이 집중적으로 성장하고 있는 현상과 사회서비스 부문의 저조한 성장이 왜 나타나는지에 대해 분석하였다. 이론적으로는 조직생태학에 근거하여 이러한 특성이 정책의 결과인지 (진입)경쟁의 결과인지를 구체적으로 논의하였다. 분석결과 초기 사회적기업에 대한 정부의 관심은 일자리 창출이었고, 2007년 이전 사회적기업으로 간주될 수 있던 조직군 중 생활공동체/빈민운동 기반 조직군의 주요 관심도 일자리 창출이었기 때문에 국내 사회적기업이 일자리제공형에 집중되기 유리한 구조를 갖게 되었다. 인증심사시 일자리제공형이 유리한지에 대해 실증적으로 분석한 결과, 일자리제공형이 다른 유형에 비해 인증심사를 위한 서류증빙이 수월하여 전략적으로 이 유형을 선택하고 있음을 발견하였다. 실제 사회적기업 관계자, 예비사회적기업을 인터뷰한 결과 인증유형에 실질적인 의미를 부여하지 않는 경향이 있었다. 사회서비스 부문의 저조한 성장은 최초에 잘못된 업종구분에 따른 통계적 수치에 근거한 것으로 밝혀졌으며, 선행연구에서 제시한 다양한 해석 또한 이러한 현실을 전혀 반영하지 못한 것이었음을 발견하였다. This study analyzes why social enterprises that provide jobs have centrally developed among all the other organizing groups while social service sector has seen a lagging development in South Korea. Theoretically, based on the organizational ecology, this study discusses in detail whether such phenomenon is a result of policy or (entry) competition. According to the analysis, in the early years of social enterprise in South Korea, the government's main focus was on creating jobs; moreover before 2007, groups that could be considered as social enterprises like the so-called community groups or groups that act for the poor, also focused on job creation, therefore, South Korea's organizing structure of social enterprise became favorable to such a type. After an objective research on whether the Authorized Certification Job Creation type is favorable, it was revealed that this type has been picked strategically as it is less difficult to receive documentary evidences compared to other types. After conducting interviews with social entrepreneurs and pre-social entrepreneurs, they do not place practical significance to what authorization type they receive. Regarding the lagging development of the social service sector, it has been revealed that it was due to using the wrong statistical data by putting it in a different category in the initial years of research, and this study reveals that such reality has not been taken into account in any other preceding researches.