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P-doping Effects of Tungsten Diselenide Transistors by Fluoropolymer Encapsulation
Hyeonji Lee,Seongin Hong,Hocheon Yoo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
We show that the ambipolar charge transport of the WSe<sub>2</sub> transistor can be made into a unipolar p- type through Cytop fluoropolymer and thermal annealing. After doping, the charge transport can be controlled by thermal annealing temperature. The C-F bond is rearranged through thermal annealing, and the well-aligned dipole moment causes the Fermi level to be lowered, enabling the channel transport to be p-doped.
Blue-light emitting electrochemical cells comprising pyrene-imidazole derivatives
Lee, Hyeonji,Sunesh, Chozhidakath Damodharan,Subeesh, Madayanad Suresh,Choe, Youngson Elsevier 2018 Optical materials Vol.78 No.-
<P><B>Abstract</B></P> <P>Light-emitting electrochemical cells (LECs), the next-generation lighting sources are the potential replacements for organic light-emitting diodes (OLEDs). In recent years, organic small molecules (SMs) have established the applicability in solid-state lighting, and considered as prospective active materials for LECs with higher device performance. Here, we describe the synthesis of pyrene-imidazole based SMs, <B>PYR1,</B> and <B>PYR2</B> that differ by one pyrene unit and their characterization by various spectroscopic methods. To investigate the thermal, photophysical, and electrochemical properties of the two synthesized compounds, we performed thermogravimetric, UV–visible, photoluminescence (PL), and voltammetric measurements. The photoluminescence (PL) emission spectra of <B>PYR1</B> and <B>PYR2</B> measured in the acetonitrile solution, where <B>PYR1</B> and <B>PYR2</B> emit in the blue spectral region with peaks aligned at 383 nm and 389 nm, respectively. The fabricated LEC devices exhibited broader electroluminescence (EL) spectra with a significant red shift of the emission maxima to 446 nm and 487 nm, with CIE coordinates of (0.17, 0.18) and (0.18, 0.25) for <B>PYR1</B> and <B>PYR2</B>, respectively. The LECs based on <B>PYR1</B> and <B>PYR2</B> produced maximum brightness values of 180 and 72 cd m<SUP>−2</SUP> and current densities of 55 and 27 mA cm<SUP>−2</SUP>, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pyrene-imidazole based SMs, <B>PYR1</B> and <B>PYR2</B> were synthesized and characterized. </LI> <LI> PL emission spectra of <B>PYR1</B> and <B>PYR2</B> emit in the blue spectral region. </LI> <LI> LECs exhibited broader EL spectra with a significant red shift than PL spectra. </LI> <LI> The LECs based on <B>PYR1</B> produced maximum brightness than <B>PYR2.</B> </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Haloferula chungangensis sp. nov., isolated from marine sediment.
Kang, Hyeonji,Traiwan, Jitsopin,Weerawongwiwat, Veeraya,Jung, Min Young,Jeong, Ji Hoon,Myung, Soon Chul,Lee, Keun Chul,Lee, Jung-Sook,Kim, Wonyong Society for General Microbiology 2013 International journal of systematic and evolutiona Vol.63 No.1
<P>A Gram-stain-negative, non-spore-forming, non-motile, strictly aerobic, rod-shaped bacterial strain, designated CAU 1074(T), was isolated from marine sediment and its taxonomic position was investigated using a polyphasic approach. Strain CAU 1074(T) grew optimally at 30 C and pH 6.5. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CAU 1074(T) formed a distinct lineage within the genus Haloferula and was most closely related to Haloferula harenae KCTC 22198(T) (96.0% similarity). Strain CAU 1074(T) contained MK-9 as the major isoprenoid quinone, and iso-C(14:0,) C(16:1)ω9c and C(16:0) as the major fatty acids. The cell wall peptidoglycan contained meso-diaminopimelic acid. The major whole-cell sugars were glucose, xylose, mannose and ribose. The polar lipids were composed of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, aminoglycolipid and two unidentified phospholipids. The DNA G+C content of the strain was 64.0 mol%. On the basis of phenotypic and chemotaxonomic data, and phylogenetic inference, strain CAU 1074(T) should be classified as a member of a novel species in the genus Haloferula, for which the name Haloferula chungangensis sp. nov. is proposed; the type strain is CAU 1074(T) (= KCTC 23578(T) = CCUG 61920(T)). An emended description of the genus Haloferula is also provided.</P>
잉여 없는 웹 서비스 조합을 위한 2단계 탐색 알고리즘
김현지(Hyeonji Kim),권준호(Joonho Kwon),이대욱(Daewook Lee),이석호(Sukho Lee) 한국정보과학회 2009 정보과학회논문지 : 데이타베이스 Vol.36 No.2
최근 웹 서비스 관련 기술들이 많은 관심을 받고 있다. 그 중 하나인 웹 서비스 컴포지션에 대한 연구도 활발히 진행되고 있다. 웹 서비스 컴포지션은 기존에 존재하던 웹 서비스들을 조합하여 마치 하나의 서비스처럼 보여 주는 것이다. 웹 서비스 컴포지션을 사용하면 기존에 존재하지 않던 웹 서비스의 기능도 제공할 수 있으며 사용자에게 더 많은 질의 결과를 줄 수도 있다. 기존의 많은 웹 서비스 컴포지션 관련 연구들은 전향 혹은 후향 체인 방식을 사용하였다. 그러나 전향 체인 방식이나 후향 체인 방식은 질의와 상관없는 방향을 탐색하는 경우가 많기 때문에 많은 시간이 걸린다는 단점이 있다. 전향과 후향을 모두 사용하여 2단계로 컴포지션을 찾는 방식도 있으나, 이 방식은 컴포지션에 포함되지 않아도 되는 웹 서비스를 포함한 결과를 낸다는 문제점이 있다. 본 논문에서는 전향 단계와 후향 단계를 거쳐 웹 서비스 컴포지션을 찾는 2단계 웹 서비스 컴포지션 탐색 방법을 제안하였다. 전향 단계에서는 미리 구축한 연결 인덱스를 사용하여 좀 더 빠르게 후보 컴포지션을 찾는다. 후향 단계에서는 토큰을 사용하여 후보 컴포지션을 잉여 웹 서비스가 포함되지 않은 컴포지션으로 분해한다. 실험을 통해 2단계 웹 서비스 컴포지션이 기존의 한 방향으로 진행하는 방식보다 더 효율적이라는 것을 보였다. 또한 기존의 2단계 방식보다 더 많은 컴포지션 결과를 사용자에게 돌려주면서도 실행 시간 면에서 기존의 2단계 방식에 필적한다는 것을 보였다. In recent years, the web services composition search has become an issue of great interest. The web services composition search is the process of integrating individual web services to yield desired behavior. Through the web services composition search, more sophisticated functionalities can be provided. Current solutions can be classified into three main classes: forward chaining approach, backward chaining approach and two-phase approach. However one-way chaining approaches, such as forward chaining approach and backward chaining approach have limitations of searching irrelevant web services. And two-phase approach has limitations of including redundant web services. In this paper, we propose an unredundant web services composition search based on the two-phase algorithm. The algorithm consists of a forward phase and a backward phase. In the forward phase, the candidate web services participating composition will be found efficiently by searching the Link Index. In the backward phase, unredundant web services compositions will be generated from candidate web services by using the Token Manager. The experimental results show that our proposed algorithm is more efficient than one-way chaining approaches. The experimental results also show that our algorithm can provide more solutions than previous two-phase approach and is comparable to previous one in execution time.