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중수소 프라즈마 처리가 다결정 실리콘 TFT의 안정성에 미치는 영향에 관한 연구
손송호,배성찬,김동환,Sohn Song Ho,Bae S. C.,Kim Donghwan 한국재료학회 2004 한국재료학회지 Vol.14 No.7
We applied a deuterium plasma treatment to the surface of polycrystalline silicon films using PECVD and observed the change with AFM, XRD, ET-IR, and SIMS measurement. A bias temperature stressing (BTS) test was carried out to evaluate the reliability of the thin-film transistors (TFT). TFTs with channel lengths as small as 2 ${\mu}m$ were electrically stressed fer up to 1000 sec at room temperature. From the parameter variation such as s-factor, leakage current and on/off ratio, we suggest that the deuterium plasma treatment suppress the hot carrier effect and improve the stability of TFTs.
Molybdenum - benzoinoxime complex 로부터 molybdenum 의 분리
김연구,정원명,박경배,박진호,황두성,이규일,박소진 한국공업화학회 1999 응용화학 Vol.3 No.2
Generally, a sodium hydroxide solution containing hydrogen peroxide is used to dissolve molybdenum-benzoinoxime complex in the α-benzoinoxime precipitation method. However, the existence of residual hydrogen peroxide in the solution will interfere with the adsorption of ^(99)Mo by alumina. The separation of molybdenum with only sodium hydroxide solution was carried out in this work. A simulated solution consisted of 50 ppm molybdenum and 1 M nitric acid was used. Adding benzoinoxime with the 20-weight ratio of benzoinoxime to molybdenum produced molybdenum-benzoinoxime complex. Molybdenum was separated from molybdenum-benzoinoxime complex by reaction during 5 minutes using distillated water,0.1 N,0.4 N sodium hydroxide solution, and sodium hydroxide solution containing 1 wt% hydrogen peroxide. As results, molybdenum was separated over 97 %, and the separation efficiency was not different with the case of solution containing hydrogen peroxide. It is estimated that hydrogen peroxide acts to accelerate dissolution rate of benzoinoxime and does not affect to separate molybdenum from molybdenum-benzoinoxime complex.
Senthilkumar, V.,Kadumudi, F.B.,Ho, N.T.,Kim, J.W.,Park, S.,Bae, J.S.,Choi, W.M.,Cho, S.,Kim, Y.S. Elsevier Sequoia 2016 Journal of Power Sources Vol.303 No.-
The present work focuses on the development of template-free mesoporous NiO nanoarrays with large surface area grown on 3D nickel foam networks by a seed mediated aqueous chemical growth technique and subsequent annealing process. The resultant binder-free, well-aligned and vertically grown NiO nanoarrays exhibits a micron-sized planar structure as well as an ultrathin thickness (~7 nm). The unique surface and electronic structure facilitates surface-dependent electrochemical reaction processes with no dead volume. They deliver a high capacitance of 2065 F g<SUP>-1</SUP> at a current density of 16 A g<SUP>-1</SUP> as a three electrode system. A specific capacitance of 1247 F g<SUP>-1</SUP> is maintained at a higher current rate of 70 A g<SUP>-1</SUP> with 88.9% retention after 5000 cycles. Finally, in a solid-state asymmetric supercapacitor configuration using NiO//activated carbon, the device delivers an enhanced supercapacitive performance, with an energy density of 43.5 Wh kg<SUP>-1</SUP> and power density of 2.1 kW kg<SUP>-1</SUP>. Thus, the current research paves the way for the use of NiO nanoarrays as an electrode material for practical supercapacitor devices with higher cycling retention and rate capacity.
Lee, Min Goo,Jeong, Myung Ho,Ahn, Youngkeun,Chae, Shung Chull,Hur, Seung Ho,Hong, Taek Jong,Kim, Young Jo,Seong, In Whan,Chae, Jei Keon,Rhew, Jay Young,Chae, In Ho,Cho, Myeong Chan,Bae, Jang Ho,Rha, S The Korean Academy of Medical Sciences 2010 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.25 No.10
<P>We sought to determine the prevalence of metabolic syndrome (MS) in patients with acute myocardial infarction and its effect on clinical outcomes. Employing data from the Korea Acute Myocardial Infarction Registry, a total of 1,990 patients suffered from acute ST-elevation myocardial infarction (STEMI) between November 2005 and December 2006 were categorized according to the National Cholesterol Education Program-Adult Treatment Panel III criteria of MS. Primary study outcomes included major adverse cardiac events (MACE) during one-year follow-up. Patients were grouped based on existence of MS: group I: MS (n=1,182, 777 men, 62.8±12.3 yr); group II: Non-MS (n=808, 675 men, 64.2±13.1 yr). Group I showed lower left ventricular ejection fraction (LVEF) (<I>P</I>=0.005). There were no differences between two groups in the coronary angiographic findings except for multivessel involvement (<I>P</I>=0.01). The incidence of in-hospital death was higher in group I than in group II (<I>P</I>=0.047), but the rates of composite MACE during one-year clinical follow-up showed no significant differences. Multivariate analysis showed that low LVEF, old age, MS, low high density lipoprotein cholesterol and multivessel involvement were associated with high in-hospital death rate. In conclusion, MS is an important predictor for in-hospital death in patients with STEMI.</P>
Development and characterization of PET/Fish Gelatin–nanoclay composite/LDPE laminate
Bae, Ho J.,Park, Hyun J.,Darby, Duncan O.,Kimmel, Robert M.,Whiteside, William S. John Wiley Sons, Ltd. 2009 Packaging technology & science Vol.22 No.7
<P>A three-layer laminate film was developed with the following structure: polyethylene terephthalate (PET)/fish gelatin (FG)–nanoclay composite/low-density polyethylene (LDPE). The FG–nanoclay composite material functioned as the oxygen barrier layer and demonstrated comparable oxygen barrier properties when compared with a similar laminate utilizing ethylene vinyl alcohol as the barrier layer at a relative humidity (RH) of up to 50%. The introduction of nanometer-sized filler clay into the FG matrix lowered the oxygen permeability (OP) because of the tortuosity effect of the clay particles. In addition, the FG–nanoclay composite film exhibited bond strengths similar to both LDPE and PET. The hydrophilic nature of FG significantly increases OP under high (>50%) RH conditions. However, this new FG laminate film could be a possible alternative for packaging designers desiring a more sustainable packaging material for low-RH (<50%) applications. Copyright © 2009 John Wiley & Sons, Ltd.</P>
S. E. Moon,Bae Ho Park,E.-K Kim,H.-C. Ryu,H.-Y. Lee,J. Park,K.-H. Park,K.-Y. Kang,M.-H. Kwak,S.-J. Lee,Y.-T. Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
Oriented (Ba$_{0.6}$,Sr$_{0.4}$)TiO$_3$ (BST60) and graded (Ba,Sr)TiO$_3$ (BST) films were deposited on MgO (001) single crystals by using a pulsed laser deposition method. Structural properties of the films were investigated by using an X-ray diffractometer. The dielectric properties of the films were investigated under a dc bias field of 0 $-$ 20 V in the temperature region from 173 to 393 K by using interdigital capacitors (IDC) fabricated by photolithography and an etching process. The temperature-dependent small-signal dielectric properties of the films were measured with a Keithley 590 C-V meter. The measured temperature-dependent tunability for an IDC device based on BST60/MgO, BT/$\cdot\cdot$/ST/MgO and ST/$\cdot\cdot$/BT/MgO multilayer structure showed interesting data. The trends of the dielectric properties of the IDC may be due to the fact that they are affected by Curie temperature, lattice constant, strain/stress, {\it etc.}
Precision measurement of a potential-profile tunable single-electron pump
Bae, Myung-Ho,Ahn, Ye-Hwan,Seo, Minky,Chung, Yunchul,Fletcher, J D,Giblin, S P,Kataoka, M,Kim, Nam BUREAU INTERNATIONAL DES POIDS ET MESURES 2015 METROLOGIA -BERLIN- Vol.52 No.2
<P>We performed a precision measurement of the current from a single-parameter electron pump, where the potential-profile for a quantum dot was manipulated by multiple top-metal gates. In an optimally tuned condition, driven with a sinusoidal-waveform microwave at <I>f</I> = 0.95 GHz, <I>B</I> = 11 T, and <I>T</I> = 0.3 K, the relative deviation of the pump current from <I>ef</I>, <I>δI</I><SUB><I>p</I></SUB>/<I>ef</I>?≡?(<I>I</I><SUB><I>p</I></SUB>?−?<I>ef</I>)/<I>ef</I> was measured to be (−0.92 ??? 1.37) ppm. Our experiment reproduces the current quantisation accuracy of a previous measurement of a single-parameter pump, but in a device fabricated using very different geometry, thereby indicating that accurate single-parameter pumping is insensitive to device details.</P>
Bae, Jun-Young,Ok, Im-Ho,Lee, Seung-Hyung,Hung, Silas S.O.,Min, Tae-Sun,Bai, Sung-Chul C. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.7
This study was designed to re-evaluate the dietary methionine requirement by means of the plasma methionine and ammonia concentrations in surgically modified rainbow trout, Oncorhynchus mykiss. A total of 35 rainbow trout averaging $505{\pm}6.5$ g (initial body weight, mean${\pm}$SD) were randomly distributed into seven groups with five fish in each group. After 48 h of feed deprivation, each group of fish was fed one of seven L-amino acid based diets containing 0.5% cystine and graded levels of methionine (0.25, 0.40, 0.50, 0.60, 0.70, 0.80 or 0.95% of diet, dry matter bases) by intubation at 1% body weight on dry matter basis. Blood samples were taken at 0, 5 and 24 h after intubation. Post-prandial plasma free methionine concentrations (PPmet, 5 h after intubation) and post-absorptive plasma free methionine concentrations (PAmet, 24 h after intubation) of fish fed diets containing 0.60% or higher methionine were significantly (p<0.05) higher than those of fish fed diets containing 0.50% or lower methionine. PPmet and PAmet in fish fed diets containing 0.60% or higher methionine were not significantly different except PPmet of fish fed diet containing 0.95% methionine. Post-prandial plasma ammonia concentrations (PPA, 5 h after intubation) of fish fed diets containing 0.70% or higher methionine were significantly higher than those of fish fed diets containing 0.60% or lower methionine, and PPA of fish fed diets containing 0.25 and up to 0.60% methionine were not significantly different from each other. Broken-line model analyses on PPmet, PAmet, and PPA indicated that the dietary methionine requirement of rainbow trout was between 0.59 (1.69) and 0.67 (1.91) % of diets (% dietary protein bases) when the diets contained 0.5% cystine.