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Tension assisted metal transfer of graphene for Schottky diodes onto wafer scale substrates
Lee, Jooho,Lee, Su Chan,Kim, Yongsung,Heo, Jinseong,Lee, Kiyoung,Lee, Dongwook,Kim, Jaekwan,Lee, Sunghee,Lee, Chang Seung,Nam, Min Sik,Jun, Seong Chan IOP 2016 Nanotechnology Vol.27 No.7
<P>We developed an effective graphene transfer method for graphene/silicon Schottky diodes on a wafer as large as 6 inches. Graphene grown on a large scale substrate was passivated and sealed with a gold layer, protecting graphene from any possible contaminant and keeping good electrical contact. The Au/graphene was transferred by the tension-assisted transfer process without polymer residues. The gold film itself was used directly as the electrodes of a Schottky diode. We demonstrated wafer-scale integration of graphene/silicon Schottky diode using the proposed transfer process. The transmission electron microscopy analysis and relatively low ideality factor of the diodes indicated fewer defects on the interface than those obtained using the conventional poly(methyl methacrylate)-assisted transfer method. We further demonstrated gas sensors as an application of graphene Schottky diodes.</P>
Lee, Young Hoon,Park, Sunghee,Oh, Jihun,Shin, Jong Won,Jung, Jaehoon,Yoo, Seunghyup,Lee, Min Hyung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.28
<P>A synthetic approach to highly efficient thermally activated delayed fluorescence (TADF) is proposed that uses ortho donor (D) acceptor (A) compounds (PXZoB, DPAoB, and CzoB), wherein the acceptor is based on triarylboron and the donor is phenoxazine (PXZ), diphenylamine (DPA), or carbazole (Cz). Combined with the ortho D-A connectivity, the bulky nature of the triarylboron endows the D-A dyads with inherent steric 'locking' for a highly twisteD-Arrangement, leading to a small energy difference between singlet and triplet excited states (Delta E-sT) and thus exhibiting very efficient TADF with microsecond-range lifetimes. In sharp contrast, the Corresponding para D-A derivatives, DPApB and CzpB, only display short-lived, normal fluorescence. Organic light-emitting diodes (OLEDs) incorporating the proposed ortho D-A compounds as emitters display orange, greenish-blue, and pure blue emission and exhibit high external quantum efficiency (eta(EQE)). In particular, the pure blue OLEDs based on the proposed ortho D-A emitters with a carbazole donor (CzoB) show a record-high eta(EQE) of 22.6% with CIE color coordinates of (0.139, 0.150), well illustrating the validity of the proposeD-Approach. Upon optical optimization, the eta(EQE) is further improved to 24.1%.</P>
Lee, Changyeol,Kim, Soonok,Li, Wei,Bang, Sunghee,Lee, Hanna,Lee, Hyun-Jung,Noh, Eun-Young,Park, Jung-Eun,Bang, Woo Young,Shim, Sang Hee Springer Science and Business Media LLC 2017 Journal of antibiotics Vol.70 No.6
<P>Endophytes, important plant-associated mycobionts, have attracted a great deal of attention because of their bioactive secondary metabolites. Even though halophytes have been reported to overcome salt stress via associations with their endophytes, few studies have investigated the metabolites produced by the endophytes from halophytes. In this study, a dark septate endophytic fungal strain (JS0464), identified as Gaeumannomyces sp. by ITS sequencing, was isolated from the rhizome of a halophyte, Phragmites communis, in Suncheon bay, South Korea. This strain was cultured on a large scale and extracted with ethyl acetate. Chemical investigations of extracts of JS0464 led to the isolation of two glycosylated dialkylresorcinol derivatives (1-2), an anthraquinone derivative (3) and eight known compounds (4-11), which were identified by spectroscopic analyses incorporating one-dimensional/2D NMR and MS. Nine compounds showed significant nitric oxide reduction activity in lipopolysaccharide-stimulated microglia BV-2 cells, seven of which did not impair cell viability. The results suggest that endophytes from the halophytes could be potential resources for bioactive natural products.</P>
Sunghee Lee,Ahram Cho,Ohsoo Na,Seongmin Sohn 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.5
When a manufacturer’s profit level depends on a supplier’s selling price, the supplier has two options according to whether it seeks the public purpose or private profit. The lava water industrialization support center under Jeju Technopark plays a supplying role for the lava water to the nearby companies. This paper analytically shows that the strategically different approaches by the supplier influences the manufacturer’s production pattern. Furthermore, we provide the basis for understanding the public supplier’s non-public action.
( Sunghee Lee ),( Kyung Min Park ),( Jongbae Park ) 한국모자보건학회 2007 한국모자보건학회 학술대회 연제집 Vol.2007 No.2
Background: As more females smoke, women’s health is in danger. New smoking cessation programs incorporating the special needs of female populations is awaited. Self- performed hand massage with aroma oil was suggested to be promisingly effective to help stop smoking, hence rigorous testing is warranted. Purpose: To test the effects of self-hand massage with aroma oil on the smoking habit and the depression of female college student smokers. Method: Fifty-one female college student smokers who wished to stop smoking took part in the study. The participants were randomly allocated to either an educational program on smoking cessation only, or self- hand massage with aroma oil for 4 weeks in addition to the educational program. The aroma oil was comprised of Lavender, Chamomile, and Bergamot essence oil. Result: The self-hand massage with aroma oil group showed significant changes on daily cigarette use and depression. Conclusion: It is promising that self-hand massage with aroma oil can be an effective adjunctive to reduce the use of daily cigarettes, and improve the depression of female college student smokers who attempted to stop smoking.
The PPLA motif of glycogen synthase kinase 3beta is required for interaction with Fe65.
Lee, Eun Jeoung,Hyun, Sunghee,Chun, Jaesun,Shin, Sung Hwa,Lee, Kyung Eun,Yeon, Kwang Hum,Park, Tae Yoon,Kang, Sang Sun Korean Society for Molecular Biology 2008 Molecules and cells Vol.26 No.1
<P>Glycogen synthase kinase 3beta (GSK 3 beta) is a serine/ threonine kinase that phosphorylates substrates such as beta-catenin and is involved in a variety of biological processes, including embryonic development, metabolism, tumorigenesis, and cell death. Here, we present evidence that human GSK 3beta is associated with Fe65, which has the characteristics of an adaptor protein, possessing a WW domain, and two phosphotyrosine interaction domains, PID1 and PID2. The GSK 3beta catalytic domain also contains a putative WW domain binding motif ((371)PPLA(374)), and we observed, using a pull down approach and co-immuno-precipitation, that it interacts physically with Fe65 via this motif. In addition, we detected co-localization of GSK 3beta and Fe65 by confocal microscopy, and this co-localization was disrupted by mutation of the putative WW domain binding motif of GSK 3beta.Finally, in transient transfection assays interaction of GSK 3 beta (wt) with Fe65 induced substantial cell apoptosis, whereas interaction with the GSK 3beta AALA mutant ((371)AALA(374)) did not, and we noted that phosphorylation of the Tyr 216 residue of the GSK 3beta AALA mutant was significantly reduced compared to that of GSK 3beta wild type. Thus, our observations indicate that GSK 3beta binds to Fe65 through its (371)PPLA(374) motif and that this interaction regulates apoptosis and phosphorylation of Tyr 216 of GSK 3beta.</P>