노인복지정책의 연구동향 고찰

정연범,김천영 한국지역발전학회 2011 지역발전연구 Vol.10 No.2

우리나라의 노인복지정책이 본격적으로 연구된 것은 1980년대 이후부터 이다. 본 연구에서는 교육학술정보원에서 노인복지정책이란 키워드로 검색한 219편의 이론적 논문을 메타분석적인 방법을 통해 노인복지정책 연구 성과를 조망해보았다. 연구의 결과 우리나라의 노인복지정책은 정책에 관한 연구가 가장 많았고, 고용문제를 포함한 경제문제, 의료문제, 재가노인서비스 등의 연구가 이루어졌고, 주택정책에 대한 연구가 부실한 것으로 나타났다. 이러한 현상은 노인인구의 증가가 점진적으로 이루어진 다른 나라와는 달리 의료기술의 발달, 소득의 증가로 인한 국민생활수준의 향상, 전후세대의 급격한 증가가 노령 층으로 이어 지는 등의 변화가 한꺼번에 이루어진 우리나라만의 독특한 현상 때문에 정책실행과 더불어 학술적인 연구가 거의 동시대적으로 이루어졌기 때문에 나타난 것으로 사료된다. 향후 노인복지 분야의 학술연구에 있어서는 노인들의 삶의 질등에 대한 연구분야가 강화되어야 할 것으로 생각한다.

반사도와 색 차 분석을 이용한 Cu-Zn 합금의 색 변화 고찰

정연범,홍성환,박혜진,김영석,김정태,이후담,황윤중,이영훈,김기범 대한금속·재료학회 2018 대한금속·재료학회지 Vol.56 No.3

The change in reflectivity of Cu-Zn alloys was investigated with the modulation of Zn content. The reflectivity of the prepared alloys were compared with pure copper and divided into wavelength regions corresponding to blue, green, yellow, and red colors. As the amounts of Zn increased, the difference in reflectivity of the yellow region increased, and that of the red region decreased. To determine the color difference, the measured reflectivity of the alloys was transformed into a tristimulus value using the Reflectance-Tristimulus value converting equation. Then the tristmulus value was converted into the CIE L*a*b* color space. The color difference was calculated using the color difference formula of the converted L* a*b* values. When 5 at%Zn was added, the color difference value was 3.224, and it increased with increasing Zn content. As the difference in the reflectivity of the green and yellow regions increased, the b* value of the alloys increased and the a* value of the alloys decreased. In this study, the addition of Zn content to Cu alloy induced changes in the reflectivity of the green and yellow wavelength regions, which influences color differences of α-Cu solid solution alloys.

사전동의 대화의 이상적인 대화구조

정연옥,양태기,박용익,임인석,심기범 한국의학교육학회 2014 Korean journal of medical education Vol.26 No.1

Informed consent (IC) should be a form of communication between a physician and patient in which information regarding all optionsof a medical procedure and the patient’s preference is shared. The aim of this study was to create a standard for communicationby IC for physicians. The IC standard was developed based on an analysis of a dialogue in our previous experience with a medicalcommunication program and a review of the literature. The dialogue pattern of the IC standard had the following six elements:opening; orientation; disclosure of information; conforming and complementing; shared decision making; and closing. Factors thatinfluenced effective IC-based communication included preparation, attitude, empathy, listening, a psychosocial factor, nonverbalcommunication, explanation, and understanding. The IC communication standard will be useful in improving the quality ofcommunication between a physician and patient in obtaining IC. It will also be used as a guideline for communication educatorsand medical students. Innovative strategies and rigorous studies are needed to improve IC counseling to establish effectivepatient-centered interviews.

대학생의 자아존중감과 스트레스에 미치는 영향 요인

정연옥,심규범,이명선,남철현 한국학교·지역보건교육학회 2015 한국학교지역보건교육학회지 Vol.16 No.3

Objectives: The purpose of this study was to investigate self esteem and stress of students at their universities for the development of a program related to school life and guidance. Methods: The survey were carried out in 5 universities located in Gyounggi Do, Gyungbuk Do, Busan city and Daegu city from 2014. October 1. to November 30. Out of a total of 500 Questionnaires answered by 500 students, 489 Questionnaires, were analyzed with SPSS version 12.0. Results: The total mean of the self esteem point of college student’s school living was 3.41±0.44 points. The total mean of the general stress point of college students was 2.67±0.52 points. Affecting factors of the self-esteem of subjects(multiple regression analysis) were important things of school living(p<0.05), human and friendship(p<0.05), protector's job(p<0.001), home economic states(p<0.001), and friendship(p<0.001). Based on multiple regression analysis, affecting factors of the stress of subjects were important things of school living(p<0.05), human and friendship(p<0.05), religion(p<0.001), protector's job(p<0.001), friendship(p<0.001), and arbeit job(p<0.05). Conclusions: The results of this study help to provide a basis for development of a strategy to improve the self-esteem and solve problems of stress for university students. Also relevant programs should be developed and provided by related authorities and universities.

Cross-linkable Aqueous Binder for High Performance Li-S Batteries Inspired by Paper Wet-strengthening Chemistry

전재범,정연식 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.1

Glyoxalated Polyacrylamide as a Covalently Attachable and Rapidly Cross-linkable Binder for Si Electrode in Lithium Ion Batteries

유정근,전재범,강기석,정연식 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2

Recently, investigation of Si-based anode materials forrechargeable battery applications garnered much interest dueto its exceptionally high capacity. High-capacity Si anode(~4,200 mAhg−1) is highly desirable for the replacement ofconventional graphite anode (< 400 mAhg−1) for large-scaleenergy-storage applications such as in electric vehicles (EVs)and energy storage systems (ESSs) for renewable energysources. However, Si-based anodes suffer from poor cyclingstability due to their large volumetric changes during repeatedLi insertion. Therefore, development of highly efficient bindermaterials that can suppress the volume change of Si is one ofthe most essential parts of improving the performance of batteries. We herein demonstrate highly cross-linked polymeric binder(glyoxalated polyacrylamide) with an enhanced mechanical property by applying wet-strengthening chemistry used in paperindustry. We found that the degree of cross-linking can be systematically adjusted by controlling the acidity of the slurry and hasa profound effect on the cell performance using Si anode. The enhanced cycle performance of Si nanoparticles obtained bytreating the binder at pH 4 can be explained by its strong interaction between the binder and Si surface and current collector, andalso rigidity of binder by cross-linking.

Improved performance of silicon anode using PEDOT:PSS copolymer binder

전기웅,전재범,유정근,허윤형,정연식 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.1

저융점 원소의 첨가에 따른 Ti₆₅Fe₃₅ 과공정 합금의 미세구조와 기계적 특성의 변화

황윤중,홍성환,김정태,김영석,박혜진,김희진,정연범,이영훈,김기범,Hwang, Yun Jung,Hong, Sung Hwan,Kim, Jeong Tae,Kim, Young Seok,Park, Hae Jin,Kim, Hee Jin,Jeong, Yeon Beom,Lee, Young Hoon,Kim, Ki Buem 한국재료학회 2017 한국재료학회지 Vol.27 No.10

The microstructural evolution and modulation of mechanical properties were investigated for a $Ti_{65}Fe_{35}$ hypereutectic alloy by addition of $Bi_{53}In_{47}$ eutectic alloys. The microstructure of these alloys changed with the additional BiIn elements from a typical dendrite-eutectic composite to a bimodal eutectic structure with primary dendrite phases. In particular, the primary dendrite phase changed from a TiFe intermetallic compound into a ${\beta}$-Ti solid solution despite their higher Fe content. Compressive tests at room temperature demonstrated that the yield strength slightly decreased but the plasticity evidently increased with an increasing Bi-In content, which led to the formation of a bimodal eutectic structure (${\beta}$-Ti/TiFe + ${\beta}$-Ti/BiIn containing phase). Furthermore, the (Ti65Fe35)95(Bi53In47)5 alloy exhibited optimized mechanical properties with high strength (1319MPa) and reasonable plasticity (14.2 %). The results of this study indicate that the transition of the eutectic structure, the type of primary phases and the supersaturation in the ${\beta}$-Ti phase are crucial factors for controlling the mechanical properties of the ultrafine dendrite-eutectic composites.

코골이 경감을 위한 임베디드 시스템 개발

박진호(Jin-Ho Park),김민호(Min-Ho Kim),김숙희(Sook-Hui Kim),문지혜(Ji-Hye Moon),정연성(Yun-Sung Jung),안창범(Chang-Beom Ahn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

본 논문에서는 일반적으로 뇌파, 안전도, 근전도, 심전도, 동맥혈, 산소포화도, 복부와 흉부의 호흡운동, 호흡기류, 코골이, 몸의 자세 등을 이용하여 측정 하는 수면 다원검사를 근간으로 하여 보다 간편하게 수면상태를 측정하고 피드백할 수 있는 시스템을 개발하여 제시한다. 이 코골이 경감을 위한 임베디드 시스템을 통해 코골이로 인해 어려움을 겪는 사용자가 숙면을 취하고, 자신의 상태를 쉽게 모니터링 할 수 있을 것으로 기대된다.

일반화 파레토 분포에서 임계치 결정에 대한 대안적 연구

윤정연,조재범,정병철,Yoon, Jeong-Yoen,Cho, Jae-Beom,Jun, Byoung-Cheol 한국통계학회 2011 응용통계연구 Vol.24 No.5

In practice, thresholds are determined by the two subjective assessment methods in a generalized pareto distribution of mean extreme function(MEF-graph) or Hill-graph. To remedy the problem of subjectiveness of these methods, we propose an alternative method to determine the threshold based on the robust statistics. We compared the MEF-graph, Hill-graph and our method through VaRs on the Korean stock market data from January 5, 1987 to August 3, 2009. As a result, the VaR based on the proposed method is not much different from the existing methods, and the standard deviation of VaR for our method was the smallest. The results show that our method can be a promising alternative to determine thresholds of the generalized pareto distributions. 일반적으로 일반화 파레토 분포(Generalized Pareto Distribution; GPD)에서 임계치를 결정하는 방법으로는 MEF-그래프나 Hill-그래프를 통한 주관적인 판단을 이용한다는 약점이 존재한다. 본 연구에서는 이와 같은 기존 방법의 약점을 해결하기 위하여 GPD에서 임계치를 결정하는 방법으로 로버스트 추정량을 이용하는 새로운 접근 방법을 제안하였다. 더불어 1987년 1월 5일부터 2009년 8월 3일까지 공시된 KOSPI지수의 일별수익률의 손실부분에 해당하는 왼쪽꼬리부분을 이용하여 실증분석을 실시하였다. 실증분석은 기존의 그래프를 이용한 임계치 결정방법과 본 연구에서 제안한 방법에서 계산된 VaR이 어떤 차이가 존재하는가를 알아보는 방법으로 실시되었다. 분석결과 본 논문에서 제안한 임계치 결정방법에 의하여 계산된 VaR값들은 기존 방법의 VaR과 큰 차이를 보이지 않았다. 아울러 본 연구에서 제안한 임계치 결정방법의 안정성을 파악한 결과 기존 방법과 큰 차이를 보이지 않았다. 이와 같은 결과들을 토대로 본 연구에서 제안한 로버스트 추정량을 이용한 임계치 결정방법은 기존의 그래프를 이용한 주관적인 임계치 결정방법에 대한 대안적인 방법으로 충분히 고려될 수 있을 것으로 생각된다.