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Nanostructural analysis of ZnO:Al thin films for carrier-transport mechanisms
Seung-Yoon Lee,Woojin Lee,남창우,Jongmin Kim,Sujin Byun,Taehyun Hwang,Byung-Kee Lee,Young Il Jang,Sungeun Lee,Heon Min Lee,박병우 한국물리학회 2013 Current Applied Physics Vol.13 No.4
The carrier mobility of sputter-deposited Al-doped ZnO transparent-conducting (ZnO:Al) thin films was controlled between 22 and 48 cm2/Vs by varying the ZnO:Al seed layer. The statistical distribution of the [001] grain misorientation was characterized from the X-ray diffraction rocking curve in the range from 0.043 (2.5) to 0.179 rad (10.2). The grain-boundary energy barriers (Eb) from Seto’s model [1] clearly exhibit linear dependence on the grain-boundary misorientation angle (u) according to the equation Eb ¼ 78 4 þ 173 32 u meV.
Oxygen-Controlled Seed Layer in DC Sputter-Deposited ZnO:Al Substrate for Si Thin-Film Solar Cells
Seung-Yoon Lee,Taehyun Hwang,Woojin Lee,Sangheon Lee,Hongsik Choi,Seh-Won Ahn,Heon-Min Lee,Byungwoo Park IEEE 2015 IEEE journal of photovoltaics Vol.5 No.2
<P>Oxygen-controlled seed layer in Al-doped ZnO (ZnO:Al) thin films deposited by the industrially compatible dynamic dc magnetron sputter results in both enhanced electron mobilities and appropriate etched morphologies for the Si thin-film solar cells. At the relatively low deposition temperature of 300 °C, optimized ZnO:Al film grown on the seed layer has the carrier mobility of 45 cm<SUP>2</SUP>/V·s and proper postetching morphology with around 1-2-μm crater size. Reduced angular distribution of the (002) grains analyzed by the diffraction rocking curve is shown as the key structural feature for the improved carrier mobility. Finally, the performance of the microcrystalline Si solar cell on the developed ZnO:Al substrate shows high-efficiency potential of the tandem solar cell adapting this transparent conductive oxide substrate.</P>
증 례 : 위에서 발견된 함몰증식성 폴립 1예 보고 및 문헌고찰
이연호 ( Yeon Ho Lee ),주문경 ( Moon Kyung Joo ),이범재 ( Beom Jae Lee ),이지애 ( Ji Ae Lee ),김태현 ( Taehyun Kim ),윤진구 ( Jin Gu Yoon ),이정민 ( Jung Min Lee ),박종재 ( Jong Jae Park ) 대한소화기학회 2016 대한소화기학회지 Vol.67 No.2
An inverted hyperplastic polyp (IHP) found in stomach is rare and characterized by downward growth of hyperplastic mucosal component into the submucosa. Because of such characteristic, IHP can be misdiagnosed as subepithelial tumor or malignant tumor. In fact, adenocarcinoma was reported to have coexisted with gastric IHP in several previous reports. Because only 18 cases on gastric IHP have been reported in English and Korean literature until now, pathogenesis and clinical features of gastric IHP and correlation with adenocarcinoma have not been clearly established. Herein, we report a case of gastric IHP which was initially misdiagnosed as gastrointestinal stromal tumor and resected using endoscopic submucosal dissection. Literature review of previously published case reports on gastric IHP is also presented.
Lee, Byungho,Lee, Sangheon,Cho, Duckhyung,Kim, Jinhyun,Hwang, Taehyun,Kim, Kyung Hwan,Hong, Seunghun,Moon, Taeho,Park, Byungwoo American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.45
<P>Organic-inorganic hybrid perovskite solar cells have emerged as promising candidates for next-generation solar cells. To attain high photovoltaic efficiency, reducing the defects in perovskites is crucial along with a uniform coating of the films. Also, evaluating the quality of synthesized perovskites via facile and adequate methods is important as well. Herein, CH3NH3PbI3 perovskites were synthesized by applying second solvent dripping to nonstoichiometric precursors containing excess CH3NH3I. The resulting perovskite films exhibited a larger average grain size with a better crystallinity compared to that from stoichiometric precursors. As a result, the performance of planar perovskite solar cells was significantly improved, achieving an efficiency of 14.3%. Furthermore, perovskite films were effectively analyzed using a conductive AFM and noise spectroscopy, which have been uncommon in the field of perovskite solar cells. Comparing the topography and photocurrent maps, the variation of photocurrents in nanoscale was systematically investigated, and a linear relationship between the grain size and photocurrent was revealed. Also, noise analyses with a conductive probe enabled examination of the defect density of perovskites at specific grain interiors by excluding the grain-boundary effect, and reduced defects were clearly observed for the perovskites using CH3NH3I-rich precursors.</P>
Lee, Jihye,Lee, Daeho,Park, Yuri,Lee, Sangwon,Ha, Taehyun Elsevier 2019 Transportation research. Part C, Emerging technolo Vol.107 No.-
<P><B>Abstract</B></P> <P>Autonomous vehicles are expected to be commercialized within a few years, and researchers have investigated various factors that influence their adoption. However, only a few studies have considered comparative and psychological perspectives that can affect user-vehicle relationships. Focusing on this limitation, this study investigates influential factors on the use of autonomous vehicles in terms of a technology acceptance model (which considers perceived ease of use, perceived usefulness, and intention to use) and factors for autonomous vehicle use (e.g., perceived risk, relative advantage, self-efficacy, and psychological ownership (i.e., feeling of ownership)). Our results show that self-efficacy positively affects the perceived ease of use and intention to use, while the relative advantage affects perceived usefulness. Psychological ownership affects the intention to use but not the perceived usefulness. This implies that encouraging a consumer to form a psychological bond (i.e., psychological ownership) with an autonomous vehicle may be an effective strategy for promoting the use of autonomous vehicles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study examines influential factors for intention to use autonomous vehicles. </LI> <LI> System and psychology level factors are identified by literature reviews. </LI> <LI> Perceived risk affects intention to use without any effects of antecedents. </LI> <LI> Self-efficacy is presented to affect perceived ease of use and intention to use. </LI> <LI> Psychological ownership significantly affects intention to use. </LI> </UL> </P>
Taehyun Lee(이태현),Grimm Noh(노그림),Dongyoub Shin(신동엽) 한국전략경영학회 2019 전략경영연구 Vol.22 No.1
본 논문은 제휴가 기업이 직접적으로 진입하는 시장의 규모에 미치는 패러독스적 효과를 분석하였다. 제휴는 기업이 직접적으로 진입하는 시장의 규모를 성장시킬 수도 있지만, 한편으로는 직접 진입을 대체하는 효과도 있을 수 있다. 본 논문은 다자적 제휴그룹과 양자적 제휴의 차이를 구분함으로써 제휴의 종류에 따라 제휴가 기업의 직접 진입 시장의 규모에 미치는 영향이 달라질 수 있음을 보여주고자 하였다. 미국 항공사 데이터를 분석한 결과, 다자적 제휴그룹에 가입하는 것은 직접 진입 시장규모의 성장을 억제하는 효과가 있는 것으로 나타났고, 양자적 제휴 네트워크 상에서 구조적 공백에 위치하는 것은 직접 진입 시장규모를 확대시키는 효과가 있는 것으로 나타났다. 또한 환경의 위협은 구조적 공백의 효과를 조절하는 것으로 나타났다. This paper examines the paradoxical effects of alliances on the size of the market that a firm directly covers in-house. We argue that alliances may serve as a basis for the growth of directly-covered market or as a substitute for it due to two different functions of alliances as enablers and constraints for market expansion. Focusing on the distinction between multilateral alliance groups and bilateral alliances, we argue that the size of a firm’s directly-covered market is affected differently by the two types of alliances. Through empirical analysis of U.S. airline industry, we found that a focal firm’s membership to a multilateral alliance group negatively affects the size of its directly-covered market, whereas the structural holes of a focal firm’s position in its bilateral alliances have a positive effect. Furthermore, environmental threat turned out to weaken the positive effect of structural holes on the size of directly- covered market.
Lee, Sangwon,Ha, Taehyun,Lee, Daeho,Kim, Jang Hyun Elsevier 2018 Information processing & management Vol.54 No.6
<P><B>Abstract</B></P> <P>Majority opinions are often observed in the process of social interaction in online communities, but few studies have addressed this issue with empirical data. To identify an appropriate theoretical lens for explaining majority opinions in online environments, this study investigates the skewness statistic, which indicates how many “Likes” are skewed to major comments on a Facebook post; 3489 posts are gathered from the New York Times Facebook page for 100 days. Results show that time is not an influential factor for skewness increase, but the number of comments has a logarithmic relation to skewness increase. Regression models and Chow tests show that this relationship differs depending on topic contents, but majority opinions are significant in overall. These results suggest that the bandwagon effect due to social affordance can be a suitable mechanism for explaining majority opinion formation in an online environment and that majority opinions in online communities can be misperceived due to overestimation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study investigates how major opinions are constructed in online environments. </LI> <LI> Skewness statistic is adopted to describe distributional property of the Likes of comments on a Facebook post. </LI> <LI> The skewness statistic is logarithmically changed by the number of comments on a post. </LI> <LI> The results show that bandwagon effect is more suitable mechanism to explain the major opinion construction in online environments. </LI> <LI> This study discusses how the bandwagon effect can be afforded from the social affordance perspective. </LI> </UL> </P>
Lee, Jeong Ae,Sohn, Bong Won,Jung, Taehyun,Byun, Do-Young,Lee, Jee Won Published by the University of Chicago Press for t 2017 The Astrophysical journal Supplement series Vol.228 No.2
<P>We present the catalog of the KVN Calibrator Survey (KVNCS). This first part of the KVNCS is a single-dish radio survey simultaneously conducted at 22 (K band) and 43 GHz (Q band) using the Korean VLBI Network (KVN) from 2009 to 2011. A total of 2045 sources are selected from the VLBA Calibrator Survey with an extrapolated flux density limit of 100 mJy at the K. band. The KVNCS contains 1533 sources in the K band with a flux density limit of 70 mJy and 553 sources in the Q band with a flux density limit of 120 mJy; it covers the whole sky down to -32 degrees 5 in decl. We detected 513 sources simultaneously in the K and Q bands; similar to 76% of them are flatspectrum sources (-0.5 <= alpha <= 0.5). From the flux-flux relationship, we anticipated that most of the radiation of many of the sources comes from the compact components. The sources listed in the KVNCS therefore are strong candidates for high-frequency VLBI calibrators.</P>