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White Light Emission Using Heteroleptic Tris-Cyclometalated Iridium (III) Complexes
YoungHee Lee,Gui Youn Park,Young Sik Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
The synthesis and photophysical study of efficient phosphorescent heteroleptic tris-cyclometalated iridium (III) complexes for white organic light-emitting devices (WOLEDs) are reported. In order to obtain a large broad band, we designed and prepared Ir(dfppy)$_2$(pq) and Ir(pq)$_2$(dfppy), where dfppy and pq are 2-(2,4-difluorophenyl) pyridine and 2-phenylquinoline, respectively. The emission wavelengths and the lifetimes of Ir(dfppy)$_2$acac and Ir(pq)$_2$acac (acac = acetyl acetonate) were reported as 469 nm and 596 nm, and 1.6 $\mu$s and 2.0 $\mu$s, respectively. A reasonably similar phosphorescent lifetime is crucial for white light emission materials. The luminescence mechanism is determined by using the decay times of two different cyclometalated (C$\hat{~}$N) ligands. As similar phosphorescent lifetimes are possible for luminescence in two ligands at the same time, the emission wavelengths of Ir complexes have large broad peaks, leading a white color. Our experimental results provide evidence that the absorption of Ir complexes occurs at each ligand upon excitation. Thus, the excitation energy causes blue and orange colors to be emitted in each ligand of the complex. To realize this idea, we synthesized an iridium complex having two different ligand structures and theoretically calculated the complex by using a computational method.\\
The hallmarks of L2 writing viewed through the prism of translation universals
Younghee Cheri Lee 경희대학교 언어정보연구소 2018 언어연구 Vol.35 No.S
Rooted in a perception that second language (L2) writing bears neither resemblance with nontranslated counterparts nor relation to translation, this article explores the untested terrain of revealing lexical and textual attributes unique to L2 writers texts, thus identifying their linguistic qualities from the angle of translation universals. Setting plausible parameters to discern translational instances related to lexical and syntactical choices, this article argues that idiosyncratic properties shared by translated English may typify the hallmarks of L2 writing produced by non-anglophone scholars in English disciplines. By compiling the comparable corpora of English journal abstracts consisting of 638,764 tokens, it is shown how salient translational features arise in expert L2 writers texts in compliance with corpus linguistics. Kruskal-Wallis tests are applied to evaluate linguistic indices that make Korean scholars L2 writing distinct from native scholars’ original writing. On a substantial level, a general presumption on the interrelatedness between expert L2 writers English and translational English has turned out to be warranted, meaning that Korean scholars L2 writing can be marked by universals of simplification, normalization, explicitation, and convergence in their broad outlines. It can be deducible from the findings that regardless of L2 proficiency levels, second language writers may be destined to go through a ‘mental translation as an inescapable cognitive mechanism during the L2 writing process, which in turn renders translational manifestations pervasive in the ‘product’ of L2 writing. The terminal pedagogical aim building metacognitive awareness to be mindful of second language processing, thus, this article concludes that expert L2 writers need to equip themselves with metacognitive strategies, thereby being consciously and explicitly aware of what to avoid and what to accept during the process of L2 writing entailing mental translation.
Lee, Keun-Wook,Jung, Jinwon,Lee, Younghee,Kim, Tae-Yoon,Choi, Soo-Young,Park, Jinseu,Kim, Doo-Sik,Kwon, Hyung-Joo Elsevier 2006 Molecular immunology Vol.43 No.13
<P><B>Abstract</B></P><P>Bacterial DNA has a variety of immunostimulatory activities, such as the activation of B cells and natural killer cells, the induction of interferon-γ, and the induction of Th1-type immune responses. In contrast, mammalian DNA does not have these activities. To evaluate the genomic DNA sequences of <I>Mycobacterium bovis</I> that have immunostimulatory activity, we used a computer to analyze the <I>M. bovis</I> genome and we designed a series of synthetic, 20 base length, phosphodiester backbone oligodeoxynucleotides (ODNs) that contain CpG motifs (MB-ODNs). We screened the immunostimulatory MB-ODNs that induce the activation of the NF-κB-responsive IL-8 promoter in RAW 264.7 cells. Our experimental analyses demonstrate that the potent CpG DNA in the <I>M. bovis</I> genome has functional effects as a Th1-responsive adjuvant, and that it activates the transcription factor NF-κB. Moreover, we found that both the CpG motifs and the context of the sequence surrounding the CpG motif are important for the immunostimulatory activities. The identification of the potent immunostimulatory DNA sequence in a native bacterial genome may give insights to the optimal sequence for well-controlled immune responses.</P>
ECgene: an alternative splicing database update
Lee, Yeunsook,Lee, Younghee,Kim, Bumjin,Shin, Youngah,Nam, Seungyoon,Kim, Pora,Kim, Namshin,Chung, Won-Hyong,Kim, Jaesang,Lee, Sanghyuk Oxford University Press 2007 Nucleic acids research Vol.35 No.suppl1
<P>ECgene () was developed to provide functional annotation for alternatively spliced genes. The applications encompass the genome-based transcript modeling for alternative splicing (AS), domain analysis with Gene Ontology (GO) annotation and expression analysis based on the EST and SAGE data. We have expanded the ECgene's AS modeling and EST clustering to nine organisms for which sufficient EST data are available in the GenBank. As for the human genome, we have also introduced several new applications to analyze differential expression. ECprofiler is an ontology-based candidate gene search system that allows users to select an arbitrary combination of gene expression pattern and GO functional categories. DEGEST is a database of differentially expressed genes and isoforms based on the EST information. Importantly, gene expression is analyzed at three distinctive levels—gene, isoform and exon levels. The user interfaces for functional and expression analyses have been substantially improved. ASviewer is a dedicated java application that visualizes the transcript structure and functional features of alternatively spliced variants. The SAGE part of the expression module provides many additional features including SNP, differential expression and alternative tag positions.</P>
THE ROLE OF CUSTOMER SERVICE CENTER TO BUILD LOYALTY RELIATIONSHIP
Younghee Lee,JungKun Park,Ren Tianbao 서비스마케팅학회 2016 서비스마케팅학회 학술대회 발표논문집 Vol.2016 No.5
With the recent advancements in information and communications technology, e-contact centers have taken on a new role in the retail world. They have become an essential gateway to retailers’ relationship with their customers. The use of consumer-trusted advanced communication technologies in e-contact centers has been found to play an important role in the creation of customer loyalty. The purpose of this study was to investigate the effect of consumer trust in information and communication technology on the trust, satisfaction, and loyalty that customers develop with e-contact centers and to provide an integrated model to assess the effect of a trustsatisfaction- loyalty linkto e-contact centers on the formation process of their loyalty to retailers. The results suggest that trust in communication technology plays an important role in the formation process of customer trust, satisfaction and loyalty within e-contact centers, and that customer trust, satisfaction, and loyalty to e-contact centersare linked to their loyalty to retailers.
Application of Distance Education for Mathematics of Junior High School
Lee, Younghee 한국수학교육학회 2002 수학교육연구 Vol.6 No.2
Recently a new type of educational method through the internet, distance education, has been developed with technology development. To find out any complement between distance education and traditional in-class education, a series of study with junior high school mathematics were conducted. Both distance education and in-class education have merits and shortcomings. Some advantages with distance education shown from the study can be used for complement to in-class education depending on the contents and subjects. Distance education in mathematics education can be a good turning point for future education.