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김경식,권민석,김병규,박형진,송승면,황정희 경북대학교 사범대학부속 중등교육연구소 2005 중등교육연구 Vol.53 No.3
한국, 일본, 미국, 영국의 교육사회학 학술지 논문을 주제별 내용분석을 통해 각각의 하위개념을 도출하고 개념의 유사성의 정도에 따라 다시 상위개념으로 분류하여 교육사회학의 주요 연구영역을 탐색하였다. 학술지에서 가장 많이 다루어진 영역은 교육과 평등/지위획득, 교육정책과 제도, 교육사회학의 성격/이론, 학교사회와 학업성취, 페미니스트(여성), 청소년 문제와 문화, 교사교육/교직사회, 공교육의 문제/교육개혁 등의 순으로 나타났다. 특히 교육정책과 제도 문제는 한국과 일본에서, 교육사회학의 발달과 정체성 문제는 영국에서, 학업성취 관련 내용은 미국에서 가장 많이 다루어졌다. The purpose of this study was to explore the research trend in sociology of education. To conduct the purpose of this study, the Korean Journal of Sociology of Education(KJSE), the Journal of Educational Sociology(JES), Sociology of Education(SOE), and Bitish Journal of Sociology of Education(BJSE)'s articles were analyzed. The findings of this study were as follows: First, though the major categories(major domains) of research areas were a few differences among nations, they were education & equality, educational policy, sociology of education theory, school society & academic achievement, feminism, adolescent problem & culture, teacher education, school crisis & education reform, course education, sociology of curriculum, and etc. Second, the most frequent research area was the educational policy & system problems in Korea and Japan; the development and identity of sociology of education in Britain; The school society & academic achievement in U.S.A.
Byeong-Ryoel Choi,Chang Woo Ji,Bueyong Park,Chang-Gyu Park,Jeong-Hwan Kim,Jeong Joon Ahn 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
The bird cherry-oat aphid Rhopalosiphum padi (Linnaeus) (Hemiptera: Aphididae) is a polyphagous species and worldwide distribution. We investigated the development periods and survivorship of R. padi nymph, and longevity and fecundity of R. padi adult. The study was conducted at six constant temperatures of 10.0, 15.0, 20.0, 25, 30.0, and 32.5°C, respectively. R. padi developed successfully from nymph to adult stage at all temperatures tested. Developmental rate of R. padi increased as temperature increased from 10.0 to 25.0°C and declined after then. The lower developmental threshold (LDT) and thermal constant (K) of R. padi nymph stage were estimated by linear regression. Higher temperature threshold (TH) and lower temperature threshold (TL) were calculated by two nonlinear functions. LDT and K of R. padi nymph stage were 5.61°C and 100.65DD. The temperature range of R. padi from TL to TH using empirical model (32.18) was wider than that from biophysiological model (27.08). Developmental completion of R. padi nymph stage was described using a two-parameter Weibull distribution model. The adult emergence frequency of R. padi over full range of constant temperatures was simulated using developmental rate functions and Weibull function. Daily egg production of R. padi in relation to adult age and temperature was estimated. Life table parameters were estimated by the jackknife method.
Park, Cheol Hwee,Lee, Hyun Jun,Hwang, Ju Hyun,Kim, Kyu Nyun,Shim, Yong Sub,Jung, Sun-Gyu,Park, Chan Hyuk,Park, Young Wook,Ju, Byeong-Kwon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.11
<P>A high-performance 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HATCN)/molybdenum oxide (MoO3) hybrid buffer layer with high hole-injection efficiency and superior plasma resistance under the sputtering process was developed. The HATCN enhances the hole-injection efficiency, and the MoO3 effectively protects the underlying organic layers from plasma damage during deposition by sputtering. This improves the characteristics of inverted top-emitting organic light-emitting diodes using a top transparent conductive oxide electrode. The device using the hybrid buffer layer showed the highest electroluminescence characteristics among devices with other buffer layers. The high hole-injection efficiency of HATCN was shown by the J-F curve of hole-only devices, and the plasma protection performance of MoO3 was shown by atomic force microscope surface morphology images of the buffer layer film after O-2 plasma treatment.</P>
Simplified thermally activated delayed fluorescence organic light-emitting diodes
Park, Chan Hyuk,Shim, Yong Sub,Park, Cheol Hwee,Jung, Sun-Gyu,Park, Young Wook,Ju, Byeong-Kwon Elsevier 2018 Optical Materials Vol.86 No.-
<P><B>Abstract</B></P> <P>Recently, after the first demonstration of efficient, thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), these devices have been widely investigated, and several new materials (hole and electron transport materials) have been reported. In this work, we demonstrate highly efficient TADF OLEDs with a simplified structure, and systematically characterize these partially evaluated reported materials; (4s,6s)–2,4,5,6,–tetra(9H–carbazol–9–yl)isophthalonitrile (4CzIPN) has been used as a TADF emissive dopant; the exciton blocking and carrier transport characteristics of 9,9′–Diphenyl–6–(9–phenyl–9H–carbazol–3–yl)–9H,9′H–3,3′–bicarbazole (Tris-PCz) and 2,7–bis(2,2′–bipyridin–5–yl)triphenylene (BPy-TP2) have been characterized and compared with those of other widely used well-known organic materials. The demonstrated simplified TADF OLEDs with a 4CzIPN doped single emissive layer showed a high peak external quantum efficiency and power efficiency of 18.6% and 31.5 lm/W, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The characteristics of Tris-PCz and BPy-TP2 were investigated. </LI> <LI> In a simplified structure, exciton blocking layer was also used as a transport layer. </LI> <LI> TADF OLEDs maintained high efficiency with the simplified structure. </LI> </UL> </P>
Temperature effects on development of Naranga aenescens Moore (Lepidoptera: Noctuidae)
Byeong-Ryoel Choi,Chang-Gyu Park,Sang-Guei Lee,Hong-Hyun Park,Jeong Joon Ahn 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
The rice green caterpillar Naranga aenescens Moore (Lepidoptera: Noctuidae) is one of important destructive insect pests to Poaceae including rice and corn. We investigated the development periods of N. aenescens egg, larva, pupa and total immature at eight constant temperatures of 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, and 32.5°C, respectively. N. aenescens developed successfully from egg to the adult stage at all temperatures tested except 15.0°C. Developmental rate of N. aenescens increased as temperature increased from 15.0 to 30.0°C but declined at 32.5°C except pupa stage. The lower developmental threshold (LDT) and thermal constant (K) was estimated by linear regression. Higher temperature threshold (TH) and lower temperature threshold (TL) were calculated by two nonlinear functions. LDT and K from egg to adult emergence were 12.01°C and 330.84DD. The temperature range of N. aenescens from TL to TH using performance model (24.03) was wider than that from SSI model (19.77). Developmental completion of N. aenescens was described using a two-parameter Weibull distribution model. The adult emergence frequency of N. aenescens over full range of constant temperatures was simulated using developmental rate functions and Weibull function.
New Hybrid Hole Extraction Layer of Perovskite Solar Cells with a Planar p–i–n Geometry
Park, Ik Jae,Park, Min Ah,Kim, Dong Hoe,Park, Gyeong Do,Kim, Byeong Jo,Son, Hae Jung,Ko, Min Jae,Lee, Doh-Kwon,Park, Taiho,Shin, Hyunjung,Park, Nam-Gyu,Jung, Hyun Suk,Kim, Jin Young American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.49
<P>We report a highly efficient p–i–n type planar perovskite solar cell with a hybrid PEDOT/NiO<SUB><I>x</I></SUB> hole-extraction layer. It has been found that the perovskite solar cell with a NiO<SUB><I>x</I></SUB> thin film as a hole-extraction layer generally exhibits lower fill factor compared to the conventionally used PEDOT:PSS thin film, whereas it shows higher photocurrent and photovoltage. The fill factor of the NiO<SUB><I>x</I></SUB>-based perovskite solar cell can be significantly improved by treating the NiO<SUB><I>x</I></SUB> surface with a dilute PEDOT solution. The photoluminescence quenching study and impedance spectroscopic (IS) analysis have revealed that the hole injection at the perovskite/NiO<SUB><I>x</I></SUB> interface is significantly facilitated with the PEDOT treatment, which should lead to the increased fill factor. As a result, the p–i–n type planar perovskite solar cell with the new hybrid hole-extraction layer exhibits a high conversion efficiency of 15.1% without the hysteresis effect.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-49/acs.jpcc.5b09322/production/images/medium/jp-2015-093225_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b09322'>ACS Electronic Supporting Info</A></P>
Park, Hong-Gyu,Lee, Jong-Jin,Dong, Ki-Young,Oh, Byeong-Yun,Kim, Young-Hwan,Jeong, Hae-Yoon,Ju, Byeong-Kwon,Seo, Dae-Shik Royal Society of Chemistry 2011 SOFT MATTER Vol.7 No.12
<P>In this paper, nanoimprint lithography was utilized to transfer a nano-pattern (NP) onto a homeotropic polyimide (PI) surface for use in liquid crystal displays (LCDs). The nano-patterned silicon mold was fabricated by laser interference lithography. A NP PI layer acted as the homeotropic alignment layer to easily and uniformly align the liquid crystal (LC) molecules. A NP LC cell with a NP PI layer was successfully operated as a vertical aligned LCD, and its performance was evaluated. The threshold voltage and response time of the NP LC cell were 2.472 V and 22.7 ms, respectively. In addition, the NP LC cell was characterized by a high thermal budget. Therefore, the competitive performance of the NP LC cell could allow new approaches to replace the conventional rubbing process in display technology.</P> <P>Graphic Abstract</P><P>We used nanoimprint lithography to form a grating nanopattern and then employed these structures as liquid crystal alignment layers for LCDs <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sm05083d'> </P>
Electrocaloric effect of K(Ta,Nb)O3/BaTiO3 multilayer thin films prepared by sol-gel method
Byeong-Jun Park,Jeong-Eun Lim,Ji-Su Yuk,Sam-Haeng Lee,Myung-Gyu Lee,Joo-Seok Park,Sung-Gap Lee 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.1
KTN/BT multilayer films were fabricated using the sol-gel method and the spin coating method. The average thickness of thesingle-coated film was about 62 to 67 nm and the average grain size was about 92 to 95 nm. TEM analysis made it possibleto observe a clear image difference between the KTN layer and BT layer due to the difference in composition and crystalstructure. As the number of coatings increased, the dielectric constant increased and the Curie temperature increased. The6-layer KTN/BT multilayer film exhibited the highest dielectric constant of about 2530 at a transition temperature of 26 °C. The 6-layer KTN/BT multilayer films showed a remanent polarization and a coercive field of 9.2 μC/cm2 and 91 kV/cm,respectively, at around room temperature. The ΔT and ΔT/ΔE of the 5-layer KTN/BT multilayer film with an applied electricfield of 150 kV/cm were 0.72 K and 4.8 mK·cm/kV, respectively, at around room temperature.