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Jeon, Sung Jae,Yu, Jeong Eun,Han, Yong Woon,Suh, Il Soon,Moon, Doo Kyung Elsevier 2019 Journal of industrial and engineering chemistry Vol.71 No.-
<P><B>Abstract</B></P> <P>Structural optimization by using donor–acceptor (D–A) conjugated polymers is a promising strategy for improving the power conversion efficiencies (PCEs) of polymer solar cells (PSCs). In this study, we report the best PCE of 8.9% based on PC<SUB>71</SUB>BM that was achieved by using a 250nm thick active layer in an inverted device through the optimization of side chains of P(2DBDT-DTffBT) backbones. Specifically, by varying the alkyl side chain lengths and shapes in the acceptor unit of polymers, the effect of side chain engineering on photovoltaic performance was systematically studied in terms of the relationship between steric hindrance and molecular weight.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New polymers by structural modification in the same backbones were designed and synthesized. </LI> <LI> This effects of the polymers were and proved through computing simulation and XRD, SCLC <I>etc.</I> </LI> <LI> The best device of P-C4 was reached to 8.9% with 250nm. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jeon, Pyo Jin,Lee, Young Tack,Lim, June Yeong,Kim, Jin Sung,Hwang, Do Kyung,Im, Seongil American Chemical Society 2016 Nano letters Vol.16 No.2
<P>Black phosphorus (BP) nanosheet is two-dimensional (2D) semiconductor with distinct band gap and attracting recent attention from researches because it has some similarity to gapless 2D semiconductor graphene in the following two aspects: single element (P) for its composition and quite high mobilities depending on its fabrication conditions. Apart from several electronic applications reported with BP nanosheet, here we report for the first time BP nanosheet-ZnO nanowire 2D-1D heterojunction applications for p-n diodes and BP-gated junction field effect transistors (JFETs) with n-ZnO channel on glass. For these nanodevices, we take advantages of the mechanical flexibility of p-type conducting of BP and van der Waals junction interface between BP and ZnO. As a result, our BP-ZnO nanodimension p-n diode displays a high ON/OFF ratio of similar to 10(4) in static rectification and shows kilohertz dynamic rectification as well while ZnO nanowire channel JFET operations are nicely demonstrated by BP gate switching in both electrostatics and kilohertz dynamics.</P>
Jeon, Sung Jae,Nam, Seung Jun,Han, Yong Woon,Lee, Tae Ho,Moon, Doo Kyung The Royal Society of Chemistry 2017 Polymer chemistry Vol.8 No.19
<▼1><P>Donor–acceptor (D–A) copolymers have been proved to be excellent candidates for efficient polymer solar cells (PSCs).</P></▼1><▼2><P>Donor–acceptor (D–A) copolymers have been proved to be excellent candidates for efficient polymer solar cells (PSCs). An easy and powerful strategy of D–A copolymer design to enhance the performance of PSCs would advance their industrialization. Here we demonstrate an effective molecular design method using the simple molecular mechanics function of MM2 (Molecular Mechanic program 2) & MMFF94 (Merck Molecular Force Field 94) calculation and noncovalent conformational locking effects in the D–A polymer backbone. It is shown to play an important role in D–A copolymers with a highly ordered structure through intra- and/or intermolecular interactions. We report a newly designed D–A copolymer donor, poly(benzodithiophene-dibenzophenazine), P(BDP-DTPz), using our strategy which exhibits good solubility, high molecular ordering and excellent charge carrier mobility balance. A maximum power conversion efficiency (PCE) of 6.2% is achieved with a P(BDP-DTPz):PC71BM blend under 1.5 G solar irradiation. This work will provide a new perspective for molecular design of D–A copolymers in PSCs.</P></▼2>
Jeon, Sungkwon,Park, Chan Hyung,Park, Sang-Hee,Shin, Min Gyu,Kim, Hyun-Ji,Baek, Kyung-Youl,Chan, Edwin P.,Bang, Joona,Lee, Jung-Hyun Elsevier 2018 Journal of membrane science Vol.555 No.-
<P><B>Abstract</B></P> <P>Thin film composite (TFC) membranes have attracted intense interest due to applications in various molecular separation processes including water purification, gas separation, organic solvent separation and saline-gradient energy production. In particular, growing global demands for clean water and reduced energy consumption have raised interest in highly permselective and low fouling TFC membranes for water treatment and desalination. This drive has led to the design of new molecular structures of TFC membranes using advanced materials. Here, we designed a new building block material, a star-shaped polymer, which can be assembled into the selective layer of the TFC membrane <I>via</I> a commercial interfacial polymerization (IP) technique. This ideal 3-dimensional compact globular geometry along with high density end-functional groups enabled the realization of membranes with higher permselectivity as well as superior antifouling properties even compared to commercial membranes. We demonstrate the remarkable versatility of this building block by using the same starting materials to fabricate membranes that can function either as nanofiltration or reverse osmosis membrane depending on the IP process conditions, which is not feasible with the conventional materials used in membrane fabrication.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TFC membranes were fabricated by interfacial polymerization of star polymers (SP). </LI> <LI> RO and NF performances can be obtained by adjusting the polymerization conditions. </LI> <LI> SP assembly produces a highly permselective layer with a unique stratified structure. </LI> <LI> SP-assembled membranes show separation performance exceeding commercial membranes. </LI> <LI> SP-assembled membranes have superior fouling resistance to commercial membranes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Valproate prevents MK801-induced changes in brain-derived neurotrophic factor mRNA in the rat brain
Jeon, Gye Sun,Park, Sang-Ha,Lee, Kuem-Ju,Lee, Min-Soo,Chun, Boe-Gwun,Shin, Kyung-Ho Elsevier 2006 european journal of pharmacology Vol.545 No.2
<P><B>Abstract</B></P><P>To investigate whether the anticonvulsant valproate influences the changes in brain-derived neurotrophic factor (BDNF) mRNA expression induced by MK801 in rat brain, we injected valproate prior to MK801 and observed the changes in the BDNF expression 3?h later. MK801 significantly increased BDNF expression in the retrosplenial and entorhinal cortex, and these increases were prevented by valproate pretreatment. Valproate pretreatment significantly blocked the MK801-induced increase of BDNF expression in retrosplenial cortex at 3?h, 6?h, and 9?h after MK801 injection, suggesting that valproate pretreatment did not delay the MK801-induced increase of BDNF expression. However, MK801 significantly decreased BDNF expression in the granule cell layer of hippocampus, and valproate pretreatment before MK801 potentiated the MK801-induced decrease in BDNF expression in granule cell layer. These results indicate that valproate pretreatment differentially affects the MK801-induced changes in BDNF expression in a region-selective manner.</P>
Insulin Resistance as a Risk Factor for Gallbladder Stone Formation in Korean Postmenopausal Women
( Sang Soo Kim ),( Jeong Gyu Lee ),( Dong Wok Kim ),( Bo Hyun Kim ),( Yun Kyung Jeon ),( Mi Ra Kim ),( Jeong Eun Huh ),( Ji Young Mok ),( Seong Jang Kim ),( Yong Ki Kim ),( In Joo Kim ) 대한내과학회 2011 The Korean Journal of Internal Medicine Vol.26 No.3
Background/Aims: The objective of this study was to determine whether insulin resistance is associated with gallbladder stone formation in Korean women based on menopausal status. Methods: The study included 4,125 consecutive Korean subjects (30-79 years of age). Subjects who had a medical history of diabetes, hypertension, dyslipidemia, other cardiovascular disorders, or hormone replacement therapy were excluded. The women were subdivided into two groups according to their menopausal status. Results: Analysis of premenopausal women showed no significant differences in the homeostasis model of assessment-insulin resistance (HOMA-IR) index between the two groups in terms of gallstone disease. The associations between the occurrence of gallbladder stones and age, obesity, abdominal obesity, hyperinsulinemia, and high HOMA-IR index were statistically significant in the analysis with postmenopausal women. In a multiple logistic regression analysis, low high density lipoprotein-cholesterol was an independent predictor of gallbladder stone formation in premenopausal women. However, the multiple logistic regression analysis also showed that age and HOMA-IR were significantly associated with gallbladder stone formation in postmenopausal women. In an additional analysis stratified by obesity, insulin resistance was a significant risk factor for gallbladder stone formation only in the abdominally obese premenopausal group. Conclusions: Insulin resistance may be associated with gallbladder stone formation in Korean postmenopausal women with abdominal obesity.
Jeon, Sung Jae,Lee, Tae Ho,Han, Yong Woon,Moon, Doo Kyung Elsevier 2018 Polymer Vol.149 No.-
<P><B>Abstract</B></P> <P>A new building block of two-dimensional (2D) A<SUB>1</SUB>-π-A<SUB>2</SUB> copolymers for P(dDTPz-ID) and P(dDTPz-DTBT) was designed and synthesized. Their structures have two strong acceptor units (isoindigo and benzothiadiazole derivatives) in the backbone, respectively. It displayed a benefit of A<SUB>1</SUB>-A<SUB>2</SUB> building blocks, which is complementary and broad light absorption from 300 to 750 nm due to acceptors with different withdrawing strengths. Also, the introduction of dangling-thiophene, π unit allowed the formation of 2D-strcuture, which and led to effective and inter-chain packing of PC<SUB>71</SUB>BM for both copolymers. Two copolymers exhibited enhanced π-π stacking properties and had predominant face-on structure, which was confirmed by XRD. We also reviewed the optical, electrochemical, morphological, charge transport properties and performance compared with A<SUB>1</SUB>-A<SUB>2</SUB> copolymers for P(DTPz-ID) and P(DTPz-DTBT), respectively. The inverted device fabricated with optimized condition for P(dDTPz-DTBT) showed efficient charge transport from enhanced energy alignment, high V<SUB>oc</SUB> and dipole moment and fine morphology, and thus obtained 5.0% of best power conversion efficiency (PCE).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two-dimensional (2D) A<SUB>1</SUB>- π -A<SUB>2</SUB> new concept of copolymers was designed and synthesized. </LI> <LI> The copolymers were characterized through GPC, TGA, UV, CV, XRD and so on. </LI> <LI> Power conversion efficiency of the best device for P(dDTPz-DTBT) was reached to 5.0%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Sang Soo Kim ),( Yun Kyung Jeon ),( Soo Hyung Lee ),( Bo Hyun Kim ),( Seong Jang Kim ),( Yong Ki Kim ),( In Ju Kim ) 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.3
We report a rare case of distant subcutaneous parathyroid carcinoma recurrence. A 50-year-old woman was referred to our hospital because of sustained hypercalcemiadespite surgical removal of a parathyroid carcinoma. A focal uptake in theupper mediastinal area was detected in a 99mTc-sestamibi scan, and 18F-fluorodeoxyglucose(FDG) positron-emission tomography (PET)/computed tomography(CT) imaging demonstrated a subcutaneous mass. She underwent tumor resection,and the pathological findings were consistent with a parathyroid carcinoma. The postoperative serum parathyroid hormone (PTH) level remained withinnormal limits. However, a new palpable solitary mass was identified in the upperportion of the left breast 1 year postoperatively. Both a 99mTc-sestamibi scanand 18F-FDG PET/CT imaging revealed an abnormal lesion in the upper breast,and subsequent pathology reports confirmed parathyroid carcinoma metastasis. Serum PTH and calcium levels fell within normal ranges after tumor resection. Two subcutaneous recurrent lesions appeared likely due to tumor seeding duringthe previous endoscopic operation at a local hospital.