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김정연,김주희,천성일,임동건,김양섭,Kim, Jeong-Yeon,Kim, Ju-Hee,Chan, Sung-Il,Lim, Dong-Gun,Kim, Yang-Seob 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.6
It is summarized that potential causes of performance degradations and failure mechanisms of crystalline silicon photovoltaic (PV) modules installed in Middle East area. In addition, we also reviewed current PV module qualification test (IEC 61215) and the methods for detection of wear-out fault. The failure of PV modules in the extreme environmental conditions such as deserts is mainly due to high temperature, humidity, and dust storms. In particular, cementation phenomenon caused by combination of sand and moisture leads to rapid degradation in the performance of PV modules. In order to evaluate and guarantee the long term reliability of PV modules, specific qualification tests such as sand dust test, salt mist test and potential induce degradation test considering operating environment of PV module should be carried out.
RF 마그네트론 스퍼터링 공정으로 PET 기판 위에 제조한 Ga-doped ZnO 투명전도막의 특성
김정연,김병국,이용구,김재화,우덕현,권순용,임동건,박재환,Kim, Jeong-Yeon,Kim, Byeong-Guk,Lee, Yong-Koo,Kim, Jae-Hwa,Woo, Duck-Hyun,Kweon, Soon-Yong,Lim, Dong-Gun,Park, Jae-Hwan 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.1
산소 플라즈마 전처리에 의한 PET 기판 위에 Ga이 도핑된 ZnO 투명전극 (GZO)의 특성변화를 고찰하였다. GZO 박막은 RF 마그네트론 스퍼터링 공정에 의해 합성하였으며 GZO 증착 이전에 PET 기판의 표면에너지를 높이고 GZO 박막과의 접촉특성을 향상시키기 위해 산소플라즈마 공정을 적용하였다. 산소 플라즈마 처리공정을 시행함에 따라 GZO 박막의 결정성과 전기적 특성이 향상하였다. RF 파워를 100 W로 하고, 플라즈마 처리시간을 600초로 하였을 때 GZO 박막의 최저 비저항 값인 $1.90{\times}10^{-3}{\Omega}-cm$의 양호한 특성을 확인되었다. The effects of $O_2$ plasma pretreatment on the properties of Ga-doped ZnO films on PET substrate were studied. GZO films were fabricated by RF magnetron sputtering process. To improve surface energy and adhesion between the PET substrate and the GZO film, $O_2$ plasma pretreatment process was used prior to GZO sputtering. As the RF power and the treatment time increased, the crystallinity increased and the contact angle decreased significantly. When the RF power was 100 W and the treatment time was 600 sec in $O_2$ plasma pretreatment process, the resistivity of GZO films on the PET substrate was $1.90{\times}10^{-3}{\Omega}-cm$.
김정연,이고은,남옥형,이효설,최성철,김광철,김미선,Kim, Jeongyeon,Lee, Koeun,Nam, Okhyung,Lee, Hyo-seol,Choi, Sungchul,Kim, Kwangchul,Kim, Misun Korean Academy of Pediatric Dentistry 2021 大韓小兒齒科學會誌 Vol.48 No.3
이 연구의 목적은 코로나바이러스감염증-2019의 전파가 학령기 아동과 부모의 심리에 미친 영향을 수면장애와 우울증의 측면에서 평가하는 것이었다. 2020년 4월 2일부터 2020년 4월 25일까지 강동 경희대학교 치과병원 소아치과를 방문한 123명의 부모와 108명의 학령기 아동을 대상으로 직접 기입 방식의 설문조사를 실시하였다. 참가자들은 Pittsburgh Sleep Quality Index, Generalized Anxiety Disorder (GAD) - 7, Center for Epidemiology Scale for Depression 로 평가되었다. 로지스틱 회기 분석은 유의 수준 5%로 시행되었다. 부모의 GAD, 우울증, 낮은 수면의 질은 각각 34.1%, 17.1%, 44.7%에서 나타났다. 아동의 GAD 유병률은 20.4%였다. 로지스틱 회기분석 결과 코로나바이러스 관련 안전재난문자로 인한 스트레스가 부모의 불안장애, 우울증과 관련이 있었다. 아동의 경우, 코로나바이러스감염증 발생 이후의 감정 변화 정도가 GAD와 연관성이 있었다. 이 연구를 통해 코로나바이러스감염증-2019의 유행으로 인한 어린이와 보호자들의 심리적 상태 변화가 있음을 확인하였고, 치과진료 시 이들의 심리상태를 고려해야 하겠다. The purpose of this study is to evaluate the effect of the spread of a new type of coronavirus infection (COVID-19) on the mental state in school-age children and parents focusing on the aspects of sleep disorders and depression. A questionnaire survey was conducted for 123 parents and 108 school-age children who visited Department of Pediatric Dentistry, Kyung Hee University Dental Hospital at Gangdong from April 2, 2020 through April 25, 2020, via the direct writing method. Participants were assessed with Pittsburgh Sleep Quality Index, Generalized Anxiety Disorder (GAD)-7, Center for Epidemiology Scale for Depression. Logistic regressions were used with a level of significance of 5%. The prevalence of GAD, depression, and poor sleep in parents were 34.1%, 17.1% and 44.7%, respectively. The prevalence of GAD in children was 20.4%. Logistic regression showed that stress from Emergency Alert Messages about COVID-19 was associated with GAD and depression in parents. In children, the degree of emotional change after COVID-19 was associated with GAD. This study confirmed that there was a change in the psychological status of children and guardians due to the epidemic of coronavirus disease-2019, and it would be necessary to consider their psychological status during dental treatment.
대두와 귀리를 첨가하여 영양을 강화시킨 기능성 시니어 혼합 두유 개발에 관한 연구
김정연,최광진,강진양,최원천,최일숙,신경옥,Kim, Jeong-Yeon,Choi, Kwang-Jin,Kang, Chin-Yang,Choi, Won-Cheon,Choi, Il-Sook,Shin, Kyung-Ok 한국식품영양학회 2020 韓國食品營養學會誌 Vol.33 No.2
The purpose of this study was to develop a functional senior mixed soymilk for seniors and to provide functional senior-mixed soymilk to prevent disease outbreaks. The isoflavone content of senior soymilk was 0.15±0.01 mg/g. The β-glucan content of senior soymilk was 9.82±0.01 mg/g. The weight gain of mice were significantly higher in the high-fat diet group than in the other groups. The serum triglyceride content was high at 102.67±40.61 mg/dL in the high-fat diet group, but significantly lower at 83.00±42.43 mg/dL in the 20% senior soymilk group. Thus, the results of this study comprehensively suggest that food intake should be ingested for each life cycle with reference to the dietary reference intakes for Koreans. In particular, the elderly in their 50s and older are deficient in protein and weakened immune capacity, so it is imperative that they maintain their health through various foods such as soymilk, which is evenly nutritious.
김정연,Kim, Jeong-Yeon 한국단미사료협회 2006 피드저널 Vol.4 No.2
인터넷 포털 사이트 다음의 조사 자료에 의하면 지난 몇 년간 인기 애완동물 베스트 10위 중 1위 개, 2위 고양이, 3위 물고기, 4위 새, 5위 거북이, 6위 햄스터, 7위 원숭이, 8위 뱀, 9위 이구아나, 10위 전갈 등 이었으니, 최근에는 마니아들로부터 한때 인기를 누렸던 기니피그와 고슴도치 이구아나의 등의 감소세가 두드러지고 새롭게 타란툴라(Tarantula)와 같은 이탈리아 맹독성 거미와 같은 독특하고 특이한 동물들이 개성시대에 걸맞게 새롭게 인기군으로 부상하고 있는 추세이다.
SnO<sub>2</sub> 반도체 나노선 네트웍 구조를 이용한 NO<sub>2</sub> 가스센서 소자 구현
김정연,김병국,최시혁,박재관,박재환,Kim, Jeong-Yeon,Kim, Byeong-Guk,Choi, Si-Hyuk,Park, Jae-Gwan,Park, Jae-Hwan 한국재료학회 2010 한국재료학회지 Vol.20 No.4
Recently, one-dimensional semiconducting nanomaterials have attracted considerable interest for their potential as building blocks for fabricating various nanodevices. Among these semiconducting nanomaterials,, $SnO_2$ nanostructures including nanowires, nanorods, nanobelts, and nanotubes were successfully synthesized and their electrochemical properties were evaluated. Although $SnO_2$ nanowires and nanobelts exhibit fascinating gas sensing characteristics, there are still significant difficulties in using them for device applications. The crucial problem is the alignment of the nanowires. Each nanowire should be attached on each die using arduous e-beam or photolithography, which is quite an undesirable process in terms of mass production in the current semiconductor industry. In this study, a simple process for making sensitive $SnO_2$ nanowire-based gas sensors by using a standard semiconducting fabrication process was studied. The nanowires were aligned in-situ during nanowire synthesis by thermal CVD process and a nanowire network structure between the electrodes was obtained. The $SnO_2$ nanowire network was floated upon the Si substrate by separating an Au catalyst between the electrodes. As the electric current is transported along the networks of the nanowires, not along the surface layer on the substrate, the gas sensitivities could be maximized in this networked and floated structure. By varying the nanowire density and the distance between the electrodes, several types of nanowire network were fabricated. The $NO_2$ gas sensitivity was 30~200 when the $NO_2$ concentration was 5~20ppm. The response time was ca. 30~110 sec.