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Position Effect Based on Anthracene Core for OLED Emitters
Kang, Hyeonmi,Shin, Hwangyu,Kim, Beomjin,Park, Jongwook American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.3
<P>Green-orange emitters based on anthracene core have been successfully synthesized by substitution with triphenylamine side group in the 9,10 or 2,6 positions. There are larger blue shifts in the UV-visible absorption and PL spectra of the synthesized 2,6-substituted derivative compared to the 9,10-substituted derivative. When the synthesized compounds were used as emitting layers in non-doped OLED devices, a related trend was observed in their optical properties. In particular, the OLED device containing the 2,6-substituted derivative was found to exhibit excellent characteristics, with maximum EL emission at 518 nm, pure green emission with CIE coordinates of (0.334, 0.604), and external quantum efficiency of 2.83%.</P>
추억 감성을 활용한 스토리텔링 패션제품 리디자인 기획과 제작
강현미(Hyeonmi Kang),박혜원(Hyewon Park) 충북대학교 생활과학연구소 2022 생활과학연구논총 Vol.26 No.3
Background/Objectives: This study aims to plan a memory redesign process and produce actual fashion products accordingly. Methods: The methods were literature reviews and case studies. The research papers and Internet sources on storytelling, memory emotion, and redesign were examined. Further, Depth-interviews and production processes were conducted. Through literature research, we defined a concept of storytelling and discovered trend of redesign in the fashion industry. Moreover, we explored the processes and products of design planning cases through storytelling with customers. Fashion brands that specifically revealed the procedures and contents of the work produced through storytelling with customers were selected as the case study by searching “storytelling design” on an Internet portal site using keywords. Results: Based on the study, the memory redesign process was planned as 1) a contest and client selection; 2) memory storytelling involving depth-interview and keyword derivation; 3) design planning involving concept setting and mapping; 4) work creation involving draft presentation, decomposition, and combination; 5) sharing thoughts. Accordingly, the process of recruiting clients and producing memory-sensitive products in person through in-depth interviews of a selected person was revealed, and the individual memory sensibility and redesign method were summarized. The “decomposition and combination” method, which is most widely used in the fashion industry, was used as the redesign technique at the time. Conclusion/Implications: This study focuses on the emotional value of personal memories contained in fashion products. Further, it can expand the area of customization by individuals at the product planning stage and contribute to the development of sustainable fashion sector by redesigning the products that individuals had.
교수자의 학습과 교수에 대한 개념(COLT) 척도의 한국판 타당화 연구
홍현미(Hyeonmi Hong),김경지(Kyong-Jee Kim),강영준(Youngjoon Kang) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.21
목적 본 연구에서는 의학교육 개선에 중요한 영향을 미치며 인구집단의 건강에 긍정적인 효과를 기대할 수 있는 의과대학 교수자의 학습과 교수 개념을 측정하기 위해 개발된 COLT 척도의 한국어판인 K-COLT에 대한 신뢰도와 타당도를 검증하였다. 방법 이를 위하여 제주대학교 의과대학, 동국대학교 의과대학, 전북대학교 의과대학 등 3개 의과대학에 소속된 교수자 154명을 대상으로 K-COLT를 이용한 자기기입식 조사를 실시하였다. 수집한 자료를 바탕으로 탐색적 요인분석, 확인적 요인분석, 신뢰도 분석을 실시하였다. 결과 K-COLT 척도는 3개 요인으로 구분되었으며, 원척도와는 다른 문항으로 구성되었다. 3개 요인은 각각 능동적 학습자 중심, 전문성 실천의 교수자, 상호 작용 학습환경으로 명명되었다. 결론 K-COLT 척도는 높은 신뢰도와 타당도를 가진 국내의 실정에 사용 가능한 척도임이 검증되었다. 원척도와 요인 구성의 차이가 나타난 것은 동서양의 문화와 사회적 상황의 차이에서 기인한 것으로 보이며, K-COLT 척도가 보다 한국의 의과대학 교수자의 학습과 교수에 대한 개념을 적절하게 반영하는 것으로 판단된다. 국내 학습과 교수에 대한 개념을 측정한 결과를 토대로 의과대학의 교수 개발에 적용할 수 있을 것이다. Objectives This study aimed to validate the Korean version of the COLT (K-COLT), an instrument for measuring medical faculty conceptions of learning and teaching. Methods The COLT scale was translated to Korean by the authors, and the questionnaires were administered to faculty members at 3 medical schools, 154 professors from three medical universities, Jeju National University Medical University, Dongguk University Medical University, and Chonbuk National University Medical University. To analyze the validity of the K-COLT, exploratory and confirmatory factor analysis were conducted. Cronbach’s α was analyzed to evaluate reliability. Results A total of 154 questionnaires were returned (approximately 51% response rate). The exploratory factor analysis identified three factors: (a) Learner Centeredness, (b) Professional Practice, and (c) Interactive Learning Environment. These three factors accounted for 54.868% of the variance. Cronbach’s alphas were 0.807, 0.744, and 0.736. Confirmatory factor analysis resulted in three factors, and CFI = 0.921, TLI = 0.9, RMSEA = 0.068, which demonstrated satisfactory goodness-of-fit indices. Reliability estimates of the three subscales were also satisfactory (Cronbach’s α = .74 - .81). Conclusions This study shows K- COLT appears to be a construct valid tool for measuring medical teachers’ conceptions of learning and teaching. The K- COLT can be a promising tool to improve faculty development in Korean medical schools
Effect of the Length of Side Group Substitution on Optical and Electroluminescene Properties
Hwangyu Shin,Hyeonmi Kang,Beomjin Kim,Youngil Park,Young-Jun Yu,박종욱 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
Blue emitting materials, 9,10-bis-biphenyl-4-yl-anthracene (AC-P), 9,10-bis-[1,1';4',1'']terphenyl-4-yl-anthracene (AC-DP), and 9,10-bis[3'',5''-deiphenyltriphenyl-4'-yl]anthracene (AC-TP) were synthesized through boration and Suzuki aryl-aryl coupling reaction. EL performance of blue light-emitters was optimized and improved by varying the chemical structures of the side groups. In the thin film state, the three materials exhibit PLmax values in the range of 442-456 nm. EL device with the synthesized compounds in the following configuration was fabricated: ITO/4,4',4''-tris(N-(2-naphthyl)-N-phenylamino)triphenylamine (2-TNATA) 60nm/N,N'-bis (naphthalene-1-yl)-N,N'-bis(phenyl)benzidine (NPB) 15nm/synthesized blue emitting materials (30nm)/1,3,5- tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi) 20nm/LiF 1nm/Al 200nm. The current efficiency and C.I.E. value of AC-TP were 3.87 cd/A and (0.15, 0.12). A bulky and non-planar side group helps to prevent π-π* stacking interaction, which should lead to the formation of more reliable amorphous film. This is expected to have a positive effect on the high efficiency of the operating OLED device.
Effect of the Length of Side Group Substitution on Optical and Electroluminescene Properties
Shin, Hwangyu,Kang, Hyeonmi,Kim, Beomjin,Park, Youngil,Yu, Young-Jun,Park, Jongwook Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
Blue emitting materials, 9,10-bis-biphenyl-4-yl-anthracene (AC-P), 9,10-bis-[1,1';4',1"]terphenyl-4-yl-anthracene (AC-DP), and 9,10-bis[3",5"-deiphenyltriphenyl-4'-yl]anthracene (AC-TP) were synthesized through boration and Suzuki aryl-aryl coupling reaction. EL performance of blue light-emitters was optimized and improved by varying the chemical structures of the side groups. In the thin film state, the three materials exhibit $PL_{max}$ values in the range of 442-456 nm. EL device with the synthesized compounds in the following configuration was fabricated: ITO/4,4',4"-tris(N-(2-naphthyl)-N-phenylamino)triphenylamine (2-TNATA) 60nm/N,N'-bis (naphthalene-1-yl)-N,N'-bis(phenyl)benzidine (NPB) 15nm/synthesized blue emitting materials (30nm)/1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi) 20nm/LiF 1nm/Al 200nm. The current efficiency and C.I.E. value of AC-TP were 3.87 cd/A and (0.15, 0.12). A bulky and non-planar side group helps to prevent ${\pi}-{\pi}^*$ stacking interaction, which should lead to the formation of more reliable amorphous film. This is expected to have a positive effect on the high efficiency of the operating OLED device.