대학교 재학생에서 Fatigue Severity Scale의 신뢰도 및 타당도 연구

이정현,정현석,임수미,조한별,마지영,고은,임주연,이선혜,배수진,이유진,류인균,정도언,Lee, Junghyun H.,Jeong, Hyeonseok S.,Lim, Soo Mee,Cho, Han Byul,Ma, Ji-Young,Ko, Eun,Im, Jooyeon J.,Lee, Sun Hea,Bae, Sujin,Lee, Yu-Jin,Lyoo, In Kyoon,Je 대한생물정신의학회 2013 생물정신의학 Vol.20 No.1

Objectives There are only a limited number of studies on instruments assessing fatigue in university students, although fatigue exerts negative influences on their health and academic performances and fatigue-related complaints are more frequently reported in young adults than middle-aged adults. The aim of this study was to validate the 9-item Fatigue Severity Scale (FSS) among university students including both undergraduate and graduate students in South Korea. Methods A total of 176 university students completed a battery of self-report questionnaires, including the FSS, the Brief Fatigue Inventory (BFI), the Beck Depression Inventory-II (BDI-II), the Beck Anxiety Inventory (BAI), the Medical Outcomes Study Short Form 36 version 2 (MOS-SF36v2), and the Inclusion of Community in the Self Scale (ICS). The data were collected from February of 2012 to June of 2012. The reliability, convergent validity, divergent validity, and exploratory factor analyses were conducted to assess psychometric properties of the FSS. Results The mean FSS score was 3.20 (standard deviation = 1.43). The FSS demonstrated an excellent internal consistency (Cronbach's ${\alpha}$ = 0.93) and item-total correlations ranged from 0.56 to 0.90. Correlations of the FSS with the BFI (r = 0.71, p < 0.01), BDI-II (r = 0.54, p < 0.01), BAI (r = 0.46, p < 0.01), MOS-SF36v2 physical component summary (r = -0.28, p < 0.01), MOS-SF36v2 mental component summary (r = -0.55, p < 0.01), and ICS (Spearman's rho = -0.07, p = 0.33) showed acceptable convergent and divergent validity. Exploratory factor analysis defined one underlying factor (eigenvalue = 5.67) that explained 93.50% of the total variance. Conclusions To the best of our knowledge, this is the first study to investigate reliability and validity of the FSS in university students. The FSS exhibits good psychometric properties for evaluation of fatigue among university students in South Korea. Since the FSS is easy to administer, score, and interpret, it could be a useful tool in research and practice for assessing fatigue among university students.

신 흡수제(KoSol-5)를 적용한 0.1 MW급 Test Bed CO₂ 포집 성능시험

이정현,김범주,신수현,곽노상,이동욱,이지현,심재구,Lee, Junghyun,Kim, Beom-Ju,Shin, Su Hyun,kwak, No-Sang,Lee, Dong Woog,Lee, Ji Hyun,Shim, Jae-Goo 한국공업화학회 2016 공업화학 Vol.27 No.4

한전 전력연구원에서 개발한 고효율 아민계 습식 $CO_2$ 흡수제(KoSol-5)를 적용하여 0.1 MW급 Test Bed $CO_2$ 포집 성능시험을 수행하였다. 500 MW급 석탄화력발전소에서 발생되는 연소 배가스를 적용하여 하루 2톤의 $CO_2$를 처리할 수 있는 연소 후 $CO_2$ 포집기술의 성능을 확인하였으며 또한 국내에서는 유일하게 재생에너지 소비량을 실험적으로 측정함으로써 KoSol-5 흡수제의 성능에 대한 신뢰성 있는 데이터를 제시하고자 하였다. 그리고 주요 공정변수 운전 및 흡수탑 인터쿨링 효율 향상에 따른 에너지 저감 효과를 테스트하였다. 흡수탑에서의 $CO_2$ 제거율은 국제에너지기구 산하 온실가스 프로그램(IEA-GHG)에서 제시하는 $CO_2$ 포집기술 성능평가 기준치($CO_2$ 제거율: 90%)를 안정적으로 유지하였다. 또한 흡수제(KoSol-5)의 재생을 위한 스팀 사용량(재생에너지)은 $2.95GJ/tonCO_2$가 소비되는 것으로 산출되었는데 이는 기존 상용 흡수제(MEA, Monoethanol amine)의 평균 재생에너지 수준(약 $4.0GJ/tonCO_2$) 대비 약 26% 저감 된 수치이다. 본 연구를 통해 한전 전력연구원에서 개발한 KoSol-5 흡수제 및 $CO_2$ 포집 공정의 우수한 $CO_2$ 포집 성능을 확인할 수 있었고, 향후 본 연구에서 성능이 확인된 고효율 흡수제(KoSol-5)를 실증급 $CO_2$ 포집플랜트에 적용할 경우 $CO_2$ 포집비용을 크게 낮출 수 있을 것으로 기대된다. The absorption efficiency of amine $CO_2$ absorbent (KoSol-5) developed by KEPCO research institute was evaluated using a 0.1 MW test bed. The performance of post-combustion technology to capture two tons of $CO_2$ per day from a slipstream of the flue gas from a 500 MW coal-fired power station was first confirmed in Korea. Also the analysis of the absorbent regeneration energy was conducted to suggest the reliable data for the KoSol-5 absorbent performance. And we tested energy reduction effects by improving the absorption tower inter-cooling system. Overall results showed that the $CO_2$ removal rate met the technical guideline ($CO_2$ removal rate : 90%) suggested by IEA-GHG. Also the regeneration energy of the KoSol-5 showed about $3.05GJ/tonCO_2$ which was about 25% reduction in the regeneration energy compared to that of using the commercial absorbent MEA (Monoethanolamine). Based on current experiments, the KoSol-5 absorbent showed high efficiency for $CO_2$ capture. It is expected that the application of KoSol-5 to commercial scale $CO_2$ capture plants could dramatically reduce $CO_2$ capture costs.

경찰공무원에서 외상후스트레스장애와 기질 및 성격 특성의 관계

이정현,김옥주,남윤영,신정하,이희봉,김지애,심민영,Lee, Junghyun H.,Kim, Ok Joo,Nam, Yoon-Young,Shin, Jungha,Lee, Heebong,Kim, Jiae,Sim, Minyoung 대한불안의학회 2015 대한불안의학회지 Vol.11 No.1

Objective : Police officers are exposed to job-related traumatic events and have a high prevalence of post-traumatic stress disorder (PTSD). This study examined the relationship between PTSD symptoms and dimensions of temperament and character in police officers. Method : Thirty-six police officers participating in a psychological support program were enrolled. All subjects were asked to complete a demographic questionnaire, the Impact of Event Scale-Revised (IES-R), the Temperament and Character Inventory (TCI) and other self-reported symptoms scales. Results : Among all participants (age $40.8{\pm}10.2$, men 94.4%), the rate of 'post-traumatic stress symptoms group' was 47.2%. After controlling for confounding factors, lower self-directedness scores were significantly associated with higher PTSD symptoms (${\beta}=0.6$, p=0.03) in multiple regression analysis. Conclusion : Character traits, especially self-directedness, were associated with the severity of PTSD symptoms severity. These findings may provide useful information regarding personality factors related to PTSD in police officers.

사회복지전담공무원의 외상사건 및 스트레스 대처방식과 외상후스트레스증상 관련성

이정현,김지애,심민영,전경선,오승아,양정일,이영렬,Lee, Junghyun H.,Kim, Jiae,Sim, Minyoung,Jeon, Kyoungsun,Oh, Seunga,Yang, Jungll,Lee, Yunglyul 대한생물정신의학회 2015 생물정신의학 Vol.22 No.2

Objectives Social workers can suffer from occupational stress resulting from dealing with clients, which might lead to metal health problems. We aimed to investigate the association of duty-related traumatic experiences and stress coping strategies with post-traumatic stress symptoms among social workers in public sector. Methods A total of 110 social workers in public sector (men 30.9%, $36.5{\pm}7.6$ yrs) participated in this study. All subjects were evaluated the frequency and the impact of duty-related traumatic events. Additionally, they completed questionnaires including the Impact of Event Scale-Revised for post-traumatic stress symptoms, the Beck Depression Inventory-II for depressive symptoms, the Scale for Suicidal Ideation for suicide symptoms and the Ways of Coping Checklist for stress coping strategies. Results The most frequent traumatic events were "Violent or abusive language from a client" (95.0%) and "Client made a fuss" (94.5%). The most distressing traumatic event was "Seeing a dead body on duty" (7.6 out of 10), which predicted post-traumatic stress symptoms (odds ratio 4.04 ; 95% confidence interval, 1.79-9.11). Among 4 types of stress coping strategies, the emotion-focused coping was positively correlated with post-traumatic stress symptoms after controlling age and sex (${\beta}$ = 0.50, p < 0.001). Conclusions Social workers in public sector showed high level of post-traumatic stress symptoms. Duty-related traumatic events and the emotional-focused coping strategies were associated with the severity of post-traumatic stress symptoms. The modification of stress coping strategies would alleviate post-traumatic stress symptoms in social workers in public sector.

실험계획법을 이용한 예인 음탐기용 음향패키지 형상 연구

이정현,신증호,권오조,김군칠,Lee, JungHyun,Shin, Jeungho,Kwon, Oh-Cho,Kim, Gunchil 한국음향학회 2019 韓國音響學會誌 Vol.38 No.2

본 연구에서는 예인 음탐기용 음향패키지에 대한 수신전압감도 특성을 분석하기 위해 수치해석과 실험계획법을 적용하였다. 수치해석 결과는 초기 설계된 음향패키지의 구조 공진 모드 특성으로 인한 수신전압감도 변화를 보여준다. 수신전압감도 편차를 줄이기 위해 도출된 음향패키지 설계 변수의 영향은 실험계획법을 통해 분석하였다. 수신전압감도 편차는 수중청음기 쉴드캔 두께(t)의 변화에 가장 민감한 것을 확인하였다. 수조시험 결과 실험계획법에 의해 도출된 음향패키지는 수신전압감도 편차가 감소됨을 확인하였다. In this paper, the characteristics of receiving voltage sensitivity about acoustic package in towed array sonar is analyzed through the numerical simulation and design of experiments. Simulation results show that the variation of receiving voltage sensitivity is caused by the structural resonance mode shape on baseline acoustic package. The effect of design parameters of the acoustic package are analyzed through the design of experiments to reduce the deviation of receiving voltage sensitivity. A change of hydrophone shield can thickness (t) is the greatest effect on the deviation of receiving voltage sensitivity. As a result of water tank test, the acoustic package derived from the design of experiments has reduced deviation of receiving voltage sensitivity.

Interagency Operations Advisory Group (IOAG) Service Catalog 에 따른 국제 표준화 및 국내 적용 방안

이정현,박덕종,안상일,Lee, Junghyun,Park, Durkjong,Ahn, Sangil 한국우주과학회 2022 우주기술과 응용 Vol.2 No.2

Space development has been independently performed by space agencies in each country. This causes redundant development for individual function, resulting in waste of space resources. Accordingly, Interagency Operations Advisory Group (IOAG) was established for standardization with mutual agreement between international organizations, and space resources can be used efficiently between space agencies through cross-support. IOAG define Service Catalog#1, #2, and #3, according to the network layer. In this technical paper, the background and main contents of the IOAG Service Catalog, and the application plan for domestic space development will be discussed.

NFT기반 연구 논문 오픈 액세스 플랫폼 설계

이정현(Junghyun Lee),임윤정(Yunjeong Im),송규원(Gyuwon Song),조민상(Minsang Cho) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.06

3차원 수리·수질모델을 활용한 낙동강 보 구간 연계모의

이정현 ( Junghyun Lee ),송용식 ( Yong-sik Song ),조재갑 ( Jeagab Cho ),민중혁 ( Joong-hyuk Min ),신창민 ( Chang-min Shin ),김경현 ( Kyunghyun Kim ) 한국물환경학회 2017 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2017 No.-

스포츠 교육학 초보 연구자의 질적 연구 경험 탐색

이정현(Junghyun Lee),박대원(Daewon Park) 한국스포츠교육학회 2021 한국스포츠교육학회지 Vol.28 No.2

이 연구의 목적은 스포츠 교육학 전공 대학원생이 초보 연구자로서 질적 연구방법을 통해 학위논문을 작성하는 경험의 이야기를 수집하고, 그 내용에 담긴 의미를 해석하는 데 있다. 이를 위해 H 대학교, 스포츠 교육학 전공 대학원생 2명을 연구참여자로 선정하고, 2020년 3월부터 11월까지 진행된 학위논문 작성 과정에서 세미나 경험의 이야기와 심층 면담, 연구계획서, 세미나문서 등의 자료를 수집하였다. 수집한 자료의 분석은 Riessman(2008)이 체계화한 “내러티브 분석 유형과 방법” 중 ‘주제 중심 분석법’과 ‘상호작용적 분석법’을 통해 이루어졌다. 연구참여자들은 질적 연구를 활용해 자신이 관심 있는 주제로 학위논문 작성을 시작했지만, 초보 연구자로서 그 과정은 절대 쉽지 않았다. 논문 주제와 연구방법의 선정에서부터 문헌 검토를 통한 이론적 배경 만들기, 질문지 작성과 면담, 질적 연구의 자료 분석과 해석까지 전 과정에서 많은 어려움을 겪었다. 이 과정에서 ‘불안’, ‘어려움’, ‘혼란’, ‘좌절’을 경험하고, ‘배움’과 ‘도전’을 통해 변화를 시도하였다. 최종적으로 두 대학원생의 학위논문 작성 경험은 ‘새로운 사고 양식 경험 및 안목의 확장’, ‘의미 구조의 변화를 통한 총체성 추구’, ‘학술적 글쓰기를 통해 연구자로 태어나기’, ‘질적 연구를 통해 체육교육자로 거듭나기’라는 의미로 해석되었다. 또한, 두 참여자는 질적 연구의 과정에서 배움과 도전을 통해 자신과 세상을 주체적으로 해석하고, 적극적으로 이해해나가며 초보 연구자이자 체육교육자로 성장하는 것으로 나타났다. The purpose of this study is to collect the stories of experience of graduate students majoring in sports pedagogy who has conducted qualitative research method as beginner researchers in the process of writing a thesis and to interpret the meaning contained in the story. The participants were selected as two graduate students majoring in sports education at H University according to the purposeful sampling. The seminar data were collected in the course of writing the thesis from March to November 2020, the story of the seminar experience, in-depth interview, the research plan of the participants, seminar document. The data collected were analyzed using the Thematic Analysis and Interactive Analysis among the "narrative analysis types and methods" systemized by Riessman(2008). The participants started writing thesis on the subject of their interest using qualitative research, but the process was really difficult. They had a lot of difficulties in selecting the topic and research method of the paper, making theoretical background through literature review, writing and interviewing questionnaires for narrative inquiry, and analyzing and interpreting data. In this process, participants experienced ‘anxiety’, ‘difficulty’, ‘confusion’, ‘disapproval’ and tried to change through "learning" and "challenge". The experience of the two graduate students in the process of writing their thesis was interpreted as meanings such as ‘extension of new thinking style and perspective’, ‘pursuing totality through change of meaning structure’, ‘rebirth as a researcher through writing’, and ‘rebirth as a physical education educator through qualitative research’. Participants of this study were found to grow up as beginner researchers and physical education educators by interpreting in a subjective way and actively understanding themselves and the world through learning and challenges in the process of qualitative research.

Tolerance analysis and diagnosis modeling of assembly considering welding distortion and patterns

Junghyun Lee(이정현) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계