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Samuel, Edmund,Jo, Hong Seok,Joshi, Bhavana,Park, Hyun Goo,Kim, Yong Il,An, Seongpil,Swihart, Mark T.,Yun, Je Moon,Kim, Kwang Ho,Yoon, Sam S. Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.423 No.-
<P><B>Abstract</B></P> <P>We demonstrate the fabrication of a MnO<I> <SUB>x</SUB> </I>/carbamide carbon nanofiber (CCNF) composite consisting of MnO particles embedded in CCNFs as a highly flexible and freestanding electrode material for supercapacitors. A sacrificial polymer component, polymethylmethacrylate, included in the precursor solution, pyrolyzes during heating, resulting in pores in the fibers, some of which are filled by the MnO nanocrystals. Carbamide is added to control the size of the MnO<I> <SUB>x</SUB> </I> particles as well as to increase the carbon content of the composite and hence its conductivity. The X-ray diffraction and Raman spectra of the composite show that the MnO particles formed have low crystallinity. Transmission electron microscopy confirms that the MnO particles are distributed very uniformly over the CCNFs. Symmetric supercapacitors constructed using electrodes of this composite exhibit specific capacitances of 498F∙g<SUP>−1</SUP> at a scan rate of 10mV∙s<SUP>−1</SUP> and 271F∙g<SUP>−1</SUP> at a current density of 1A∙g<SUP>−1</SUP>. They also exhibit excellent long-term cycling performance, retaining 93% of their initial capacity after 5000 cycles of galvanostatic charging/discharging.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We successfully fabricated a novel flexible MnO/CCNF composite. </LI> <LI> Flexible MnO/CCNF showed excellent retention (93%) after 5000 cycles at 1Ag<SUP>−1</SUP>. </LI> <LI> MnO/CCNF composite demonstrated specific capacitance of 498Fg<SUP>−1</SUP> at a scan rate of 10mVs<SUP>−1</SUP>. </LI> <LI> Dynamic MnO particle formation controlled by using carbamide. </LI> </UL> </P>
Kim, Moon Young,Baik, Soon Koo,Park, Dong Hun,Lim, Dae Wook,Kim, Jae Woo,Kim, Hyun Soo,Kwon, Sang Ok,Kim, Young Ju,Chang, Sei Jin,Lee, Samuel S. Wiley-Blackwell Publishing 2007 Liver International Vol. No.
<P>Abstract</P><P>Background and Aims</P><P>Alterations in the Doppler hepatic vein (HV) waveform are associated with cirrhosis and portal hypertension. We prospectively evaluated the correlation between the extent of abnormal Doppler HV waveforms expressed as damping index (DI) and the hepatic venous pressure gradient (HVPG) and response to propranolol in patients with cirrhosis.</P><P>Material and Methods</P><P>In 76 patients with cirrhosis (69 men and seven women), both DI of Doppler HV waveform and HVPG were measured, and the relationship between them was analysed. DI was calculated by the minimum velocity/maximum velocity of the HV waveform. An HVPG>12 mmHg was defined as severe portal hypertension. In a subgroup of 19 patients receiving propranolol, changes in both DI and HVPG were evaluated after propranolol administration for 3 months. One author (S. K. B.) performed all DI of Doppler HV waveform studies.</P><P>Results</P><P>Abnormal HV waveforms were seen in 66 of 76 patients (86.8%). DI significantly correlated with the grade of HVPG, i.e. with higher HVPG increased DI was observed (<I>P</I><0.01). By logistic regression analysis, DI>0.6 was significantly more likely to be severe portal hypertension (odds ratio: 14.19, 95% confidence interval: 4.07–49.55). Receiver-operating characteristic curve according to the value of 0.6 of DI showed a sensitivity of 75.9% and a specificity of 81.8% for the presence of severe portal hypertension. In 19 patients of the propranolol subgroup, change of DI following propranolol treatment also significantly correlated with that of HVPG (<I>P</I><0.01).</P><P>Conclusions</P><P>Damping index of the HV waveform by Doppler ultrasonography might be a non-invasive supplementary tool in evaluating the severity of portal hypertension and in responding to propranolol in patients with liver cirrhosis.</P>
Global patterns of hepatocellular carcinoma management from diagnosis to death: the BRIDGE Study
Park, Joong-Won,Chen, Minshan,Colombo, Massimo,Roberts, Lewis R,Schwartz, Myron,Chen, Pei-Jer,Kudo, Masatoshi,Johnson, Philip,Wagner, Samuel,Orsini, Lucinda S,Sherman, Morris Wiley-Blackwell Publishing 2015 Liver International Vol.35 No.9
<P><B>Background & Aims</B></P><P>Hepatocellular carcinoma (HCC) is the second most common cause of cancer deaths worldwide. The global HCC BRIDGE study was a multiregional, large-scale, longitudinal cohort study undertaken to improve understanding of real-life management of patients with HCC, from diagnosis to death.</P><P><B>Methods</B></P><P>Data were collected retrospectively from January 2005 to September 2012 by chart reviews of eligible patients newly diagnosed with HCC at participating institutions.</P><P><B>Results</B></P><P>Forty-two sites in 14 countries contributed final data for 18 031 patients. Asia accounted for 67% of patients, Europe for 20% and North America for 13%. As expected, the most common risk factor was hepatitis C virus in North America, Europe and Japan, and hepatitis B virus in China, South Korea and Taiwan. The most common Barcelona Clinic Liver Cancer stage at diagnosis was C in North America, Europe, China and South Korea, and A in Taiwan and Japan. Across all stages, first HCC treatment was most frequently transarterial chemoembolization in North America, Europe, China and South Korea, percutaneous ethanol injection or radiofrequency ablation in Japan and resection in Taiwan. Survival from first HCC treatment varied significantly by region, with median overall survival not reached for Taiwan and 60, 33, 31, 24 and 23 months for Japan, North America, South Korea, Europe and China respectively (<I>P</I> < 0.0001).</P><P><B>Conclusions</B></P><P>Initial results from the BRIDGE study confirm previously reported regional trends in patient demographic characteristics and HCC risk factors, document the heterogeneity of treatment approaches across regions/countries and underscore the need for earlier HCC diagnosis worldwide.</P>
Samuel, Edmund,Jo, Hong Seok,Joshi, Bhavana,An, Seongpil,Park, Hyun Goo,Il Kim, Yong,Yoon, Woo Young,Yoon, Sam S. Elsevier 2017 ELECTROCHIMICA ACTA Vol.231 No.-
<P><B>Abstract</B></P> <P>We demonstrate the fabrication of freestanding and flexible MnO-decorated carbon nanofiber (CNF) composites as lithium-ion battery anode materials. They showed an initial capacity of 1131mAh·g<SUP>−1</SUP> and a retention capacity of 923mAh·g<SUP>−1</SUP> after 90 charge-discharge cycles under a current rate of 123mA·g<SUP>−1</SUP>. Decoration of MnO nanocrystals on the CNFs enhanced the lithium storage capacity of the composites. The optimal concentration of MnO was identified by varying its weight percentage from 0 to 7%. When the concentration was increased, more reaction sites for lithium ions were formed, which in turn increased the overall specific capacity. The intensity of the <I>D</I> band in the Raman spectra of the decorated CNFs was higher than that of the <I>G</I> band, indicating the enhanced diffusion of lithium ions. The plateau region of the discharge curve observed in the cases of higher MnO concentrations indicated the active reduction of MnO; consequently, a higher reversible capacity was achieved. These flexible and freestanding MnO-CNF nanocomposites can be used in lightweight, portable, and flexible batteries.</P>
Association between IRF6 and nonsyndromic cleft lip with or without cleft palate in four populations
Park, Ji Wan,McIntosh, Iain,Hetmanski, Jacqueline B,Jabs, Ethylin Wang,Kolk, Craig A Vander,Wu-Chou, Yah-Huei,Chen, Philip K,Chong, Samuel S,Yeow, Vincent,Jee, Sun Ha,Park, Beyoung Yun,Fallin, M Danie Springer Science and Business Media LLC 2007 Genetics in medicine Vol.9 No.4
Joshi, Bhavana,Park, Sera,Samuel, Edmund,Jo, Hong Seok,An, Seongpil,Kim, Min-Woo,Swihart, Mark T.,Yun, Je Moon,Kim, Kwang Ho,Yoon, Sam S. Elsevier S.A 2018 Journal of Electroanalytical Chemistry Vol.810 No.-
<P><B>Abstract</B></P> <P>Zeolitic imidazole frameworks (ZIFs) are a class of metal organic frameworks (MOFs) with diverse energy-related applications. High-surface area materials derived from ZIFs can serve as electrodes with good long-term capacity retention. Herein, we demonstrate an electrospun ZIF7/carbon nanofiber (CNF) derived nanocomposite as a freestanding electrode for supercapacitors with excellent capacitance retention. The optimal ZIF7 composite nanofiber carbonized at 950 °C exhibited a specific capacitance of 202 F·g<SUP>−1</SUP> at a current density of 1 A·g<SUP>−1</SUP> and ~98% specific capacitance retention after 5000 charge–discharge cycles. N-doped nanoporous C and the Zn framework of ZIF7 composite fibers delivered an energy density of 42 W·h·kg<SUP>−1</SUP> at a power density of 0.6 kW·kg<SUP>−1</SUP>. These scalable ZIF7/CNF composite textiles (30 × 10 cm<SUP>2</SUP>) can be used as freestanding supercapacitor electrodes without a separate substrate or current collector.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zeolitic imidazole frameworks-7 nanofiber as a freestanding electrode for supercapacitors is demonstrated. </LI> <LI> The ZIF-7 nanofiber exhibited a specific capacitance of 202 F·g<SUP>−1</SUP> at a current density of 1 A·g<SUP>−1</SUP>. </LI> <LI> The nanofiber exhibited 98% specific capacitance retention after 5000 charge–discharge cycles. </LI> <LI> The well-embedded ZIF-7 that formed pores in the CNF by the removal of Zn increased the electrochemical performance. </LI> <LI> This one-step fabricated method is produced by a commercially scalable process. </LI> </UL> </P>
Joshi, Bhavana,Samuel, Edmund,Kim, Tae-Gun,Park, Chan-Woo,Kim, Yong-Il,Swihart, Mark T.,Yoon, Woo Young,Yoon, Sam S. Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.768 No.-
<P><B>Abstract</B></P> <P>This manuscript reports the preparation, characterization, and testing of stable high-capacity lithium-ion battery anodes based on graphitic carbon nitride (g-CN) nanosheets hosting ZnFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles (ZFCN). The ZFCN is prepared by a one-pot thermal process, then supersonic cold spraying is used to rapidly deposit films with a lamellar morphology that allows enhanced capacity retention by preventing particle agglomeration. The presence of g-CN nanosheets minimizes degradation of ZnFe<SUB>2</SUB>O<SUB>4</SUB> by providing a buffering space during the lithiation/delithiation process. The ZFCN composite anodes exhibit first reversible capacities of 1550 mAh·g<SUP>−1</SUP> at 50 mA·g<SUP>−1</SUP> and up to 934 mAh·g<SUP>−1</SUP> at 1000 mA·g<SUP>−1</SUP> after 20 cycles. The superior electrochemical performance and capacity retention (88% after 160 cycles at 100 mA·g<SUP>−1</SUP> relative to the first reversible capacity) are attributed to highly reversible alloying/conversion mechanisms. The combination of high performance and stability with the use of low-cost earth-abundant elements and scalable processing approaches gives this ZFCN composite immense potential for use as a stable high-performance anode material for lithium-ion batteries.</P> <P> <UL> <LI> ZnFe<SUB>2</SUB>O<SUB>4</SUB>/g-C<SUB>3</SUB>N<SUB>4</SUB> films were fabricated as LIB anode via rapid supersonic spraying. </LI> <LI> Lamellar morphology prevented particle agglomeration ensuing enhanced capacity retention. </LI> <LI> High capacity retention of 93% is observed at 100 mA·g<SUP>-1</SUP> after 70th cycle. </LI> <LI> The ZFCN composite shows high capacity of 934 mAh·g<SUP>-1</SUP> at 1000 mA·g<SUP>-1</SUP> current rate. </LI> </UL> </P>