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Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>
( Ju Hee Kim ),( Woong Sik Nam ),( Doo Hyun Lee ),( Su Youn Lee ),( Hung Chan O ),( Jeong Min Joo ),( Kwang Hyeon Liu ),( Jae Yun Han ),( Sung Hwan Ki ),( Tae Cheon Jeong ),( Tae Ho Lee ),( Sang Kyu L 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
Cytochrome P450 (cyp) is an important enzyme that can act on xenobiotic substances such as toxic chemicals or drugs. Phenobarbital(PB) has been widely used to induce CYP2B activity to investigate the drug-drug interaction of CTP2B substrate drugs.leelamine is a diterpene compound, and is the current focus of efforts to develop a treatment for diabetes. In this study. we identi-fied the selective and potent inductive effct of leelamine on CYP2B antdoes of 5,10,or 20 mg/kg in male ICR micc for I or 3 days. In liver, the activity of CYP2B significantly increased 3.6-fold after treatment with leelamine,com-pared to vehicle-treated group. Activities of benzyloxy-resorufin O-dealkylase and pentoxyresorufin O-dealkylase significantly increased 6.3-and 5.3-fold, respectively,with a single treatment of 20 mg/kg leelamine for I day. Fur-thermore. immunoblot analysis showed that signifieantly and dose-dependently increased CYP2B10 protein levels in liver.However,PCR results showed that there were no significant changes in the CAR and CYP2B mRNA levels after leelamine treatment. Accordingly, we suggest that leelamine is a novel substitute of PB for the seleetive inudction of CYP2B activity in vivo.
ICP-RIE 방법에 의한 Si 식각 특성 개선에 관한 연구
강교성(Gyo-Sung Kang),권순일(Soon-Il Kwon),양계준(Kea-Joon Yang),김홍오(Hong-O Kim),임동건(Dong-Gun Lim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, deep trench etching of silicon was investigated as a function of source power (300~600 W), DC bias voltage (0~-100 V), O2 addition (0~29%). As increasing the RF source power from 300 W to 700 W, the etch rate was increased from 3.52 ㎛/min to 7.07 ㎛/min. The addition of O₂ gas improved the etch rate and the selectivity. The highest etch rate is achieved at the O₂ gas addition of 12%. The selectivity to PR was 65.75 with O₂ gas addition of 24%. At DC bias voltage of -40 V and C₄F? gas flow rate of 30 seem, We were able to achieve etch rate as high as 5.25 ㎛/min with good etch profile.
Park, J.H.,Choi, O.,Lee, T.H.,Kim, H.,Sang, B.I. Pergamon Press 2016 CHEMOSPHERE - Vol.163 No.-
Wastewaters from swine farms, nitrogen-dealing industries or side-stream processes of a wastewater treatment plant (e.g., anaerobic digesters, sludge thickening processes, etc.) are characterized by low C/N ratios and not easily treatable. In this study, a hollow fiber-membrane biofilm reactors (HF-MBfR) system consisting of an O<SUB>2</SUB>-based HF-MBfR and an H<SUB>2</SUB>-based HF-MBfR was applied for treating high-strength wastewater. The reactors were continuously operated with low supply of O<SUB>2</SUB> and H<SUB>2</SUB> and without any supply of organic carbon for 250 d. Gradual increase of ammonium and nitrate concentration in the influent showed stable and high nitrogen removal efficiency, and the maximum ammonium and nitrate removal rates were 0.48 kg NH<SUB>4</SUB><SUP>+</SUP>-N m<SUP>-3</SUP> d<SUP>-1</SUP> and 0.55 kg NO<SUB>3</SUB><SUP>-</SUP>-N m<SUP>-3</SUP> d<SUP>-1</SUP>, respectively. The analysis of the microbial communities using pyrosequencing analysis indicated that Nitrosospira multiformis, ammonium-oxidizing bacteria, and Nitrobacter winogradskyi and Nitrobacter vulgaris, nitrite-oxidizing bacteria were highly enriched in the O<SUB>2</SUB>-based HF-MBfR. In the H<SUB>2</SUB>-based HF-MBfR, hydrogenotrophic denitrifying bacteria belonging to the family of Thiobacillus and Comamonadaceae were initially dominant, but were replaced to heterotrophic denitrifiers belonging to Rhodocyclaceae and Rhodobacteraceae utilizing by-products induced from autotrophic denitrifying bacteria. The pyrosequencing analysis of microbial communities indicates that the autotrophic HF-MBfRs system well developed autotrophic nitrifying and denitrifying bacteria within a relatively short period to accomplish almost complete nitrogen removal.
안성훈 ( Seong Hun Ahn ),김민수 ( Min Su Kim ),이상훈 ( Sang Hun Lee ),권오상 ( O Sang Kwon ),김재효 ( Jae Hyo Kim ),소광섭 ( Kwang Sup Soh ),손인철 ( In Chul Sohn ) 대한경락경혈학회 2009 Korean Journal of Acupuncture Vol.26 No.1
Objective: In 1960`s Bonghan Kim`s team found BongHan(BH) ducts which were presumed as acupuncture meridians and BH corpuscles. They asserted Bonghan theory and SanAl theory which was involved in cell division and cell restoration. However, many other experiments which had been operated to demonstrate and find the existence of BH ducts had failed because of the secret of blue stain drugs. During the last several years, BongHan theory has been revived through experimental researches to find the anatomical structures of BH ducts and corpuscles by Soh`s Biomedical Physics Lab. Soh`s research team used the staining with Janus Green B, Alcian blue, nanoparticles and Acridine Orange. We used DAPI staining to find the existence of BH ducts and the corpuscles and to observe nuclear arrangement. Methods: We used japan white rabbits as experimental animals. BH ducts and corpuscles were stained with DAPI. The nucleus configuration in BH ducts stained with DAPI were observed with microscope. Results: In this study, we found thread like structures in silver white color distinguished from the blood vessels, nerves and lymph vessels. These thread like vessels in the linear duct shape were connected to same colored mass in the ball shape. Thread like structures we found could be separated easily from the surrounding other organ mass. The nuclei of the thread like structure in DAPI staining, are about 10~20㎛ length, in rod shape and linear arrangement. Conclusion: We concluded that the thread like structure we found was same vessel reported by Soh`s research team, BongHan ducts and corpuscle.
Moon, Seokyoon,Park, Sung O.,Ahn, Yun-Ho,Kim, Heejoong,Shin, Eunhye,Hong, Sujin,Lee, Yunseok,Kwak, Sang Kyu,Park, Youngjune Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.348 No.-
<P><B>Abstract</B></P> <P>To unlock the potential of clathrates hydrate for versatile applications in energy and environmental application such as energy storage, gas separation, and novel functional materials, profound understanding of their hidden nature must be secured. In this study, we focused on the complex host–guest and heterogeneous guest–guest interactions occurring on the sH hydrates of 3,3-dimethyl-1-butanol with help gases of CH<SUB>4</SUB> or CO<SUB>2</SUB>. The density functional theory calculations and spectroscopic experimental analyses showed that the dynamics of the large 3,3-dimethyl-1-butanol guest molecule as well as the host water frameworks of sH hydrate were significantly influenced by the type of gaseous co-guest molecules via complex host–guest and/or guest–guest interactions. The flexible hydrogen-bonded water framework underwent contraction or elongation in the O:H–O hydrogen and O–H polar-covalent bonds induced by distinct occupation patterns of the co-guest help gases, and it was observed that, depending on the type, the co-guest help gases triggered the transformation of torsional configuration of the hydrophobic moieties of the large 3,3-dimethyl-1-butanol guest molecule while the hydrophilic part was incorporated into the host water framework.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The complex host–guest interactions occurring on sH hydrates was investigated <I>via</I> experimental and DFT calculation. </LI> <LI> The dynamics of DMB guest molecules were significantly influenced by the type of gaseous co-guest molecules. </LI> <LI> The contraction and/or elongation patterns of the intermolecular hydrogen bond were examined. </LI> <LI> The co-guest help gases evoked a discrete torsional configuration of the DMB molecule. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
장기 저장연료의 열안정성 및 연료접촉 고무오링의 수명예측 연구
정근우(K. W. Chung),홍진숙(J. S. Hong),김영운(Y. W. Kim),한정식(J. S. Han),정병훈(B. H. Jeong),권태수(T. S. Kwon),서동욱(D. O. Suh),성민준(M. J. Sung),권영일(Y. I. Kwon) 한국트라이볼로지학회 2018 한국윤활학회지(윤활학회지) Vol.34 No.5
Thermal deterioration of fuel due to long-term storage influences engine performance and causes malfunctions. Fuel stability is usually evaluated via heat resistance and thermal stability during a brief heat shock at high temperature; storage stability in this scenario means that there is very little change in the quality of the fuel during long-term storage. In addition, rubber-based products such as oil seals, O-rings, and rubber hoses can influence the quality of the fuel. When these rubber products are in contact with fuel, they can swell, mechanically weaken, and occasionally crack, thus leaking low molar weight rubber and additives including plasticizer and antioxidant into the fuel to degrade its properties and shorten its useful lifetime. This study determines the thermal stabilities of three kinds of synthetic fuels by evaluating their low temperature kinematic viscosities, chemical composition changes via GC analyses, gross heat of combustion, and color changes. We evaluate the compression set of O-rings by immersing one NBR and two FKM rubber O-rings in the three synthetic fuel samples in airtight containers at variable storage temperatures for six months; from this, we estimate the lifetimes of the O-rings using the Power law model. There were very little changes in the chemical compositions and gross heat of combustion after six months of the experiment. The lifetimes are thus dependent on the materials of the rubber products, and in particular, the FKM O-ring was calculated to have a theoretical lifetime of 200 to 5,700 years. These results indicate that the synthetic fuels maintain their physical properties even after long-term storage at high temperatures, and the FKM O-ring is suitable for long-term sealing of these fuels.
Lee, Go-Eun,Yun, Jong-Min,Yang, Seung-Bum,Kang, Yeonseok,Kang, Hyung-Won,Choi, Kwang-Ho,Kim, Junbeom,Kwon, O. Sang,Park, Ji-Eun,Kim, Jae-Hyo Hindawi 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-
<P>The aim of this preliminary study is to investigate the changes in phase synchronization in the theta and alpha bands before and during the performance of classical acupuncture on the Sinmun (HT7). The electroencephalogram (EEG) signals from nine healthy young subjects were recorded before and during acupuncture in the “closed-eye” state. The EEG signals were acquired from 19 surface scalp electrodes (FP1, FP2, F7, F3, Fz F4, F8, T3, C3, Cz, C4, T4, T5, P3, Pz, P4, T6, O1, and O2). Needles were inserted into the HT7 bilaterally and were then manipulated to induce<I> deqi</I> and retained for 15 minutes. Phase synchronization was measured by phase coherence. In the theta band, coherence significantly increased between the temporal (T5, T6) and occipital areas (O1, O2) during the acupuncture stimulation. In the alpha band, coherence significantly increased between the left temporal area (T5) and other areas (frontal, parietal, and occipital). Phase coherence in the theta and alpha bands tended to increase during the retention of the acupuncture needles after<I> deqi</I>. Therefore, it can be concluded that acupuncture stimulation with<I> deqi</I> is clinically effective via the central nervous system (CNS).</P>
CHF₃ / C₂F6 플라즈마에 의한 실리콘 표면 잔류막의 특성
권광호(K.-H. Kwon),박형호(H.-H. Park),이수민(S. M. Lee),강성준(S. J. Kang),권오준(O.-J. Kwon),김보우(B.W. Kim),성영권(Y.-K. Sung) 한국진공학회(ASCT) 1992 Applied Science and Convergence Technology Vol.1 No.1
실리콘을 CHF₃/C₂F_6 가스 플라즈마를 이용하여 식각하면 실리콘위에 탄소, 불소 및 산소로 이루어진 잔류막이 형성된다. 이 잔류막을 XPS로 분석한 결과 탄소는 C-Si, C-Si, C-C/H, C-CF_x(x≤3), C-F, C-F₂, C-F₃ 결합을 하고 있으며, 불소는 F-Si, F-C 및 F-O 결합으로 이루어져 있음을 알았다. 한편 산소는 O-Si 및 O-F 결합으로, 실리콘은 Si-Si, Si-C 및 Si-O 결합상태를 나타낸다. 잔류막의 수직분포 연구를 통하여 Si-O 및 Si-C 결합이 탄소와 불소의 결합층 아래에 존재하고, 잔류막의 표면부에 F-O 결합이 분포함을 알았다. 또한 건식식각 변수가 잔류막 형성에 미치는 영향이 조사되었으며 CHF₃/C₂F_6 가스 유량비, RF power 벚 압력 등이 잔류막의 두께, 조성비 및 잔류막의 결합상태에 영향을 미침을 알 수 있었다. Si surfaces exposed to CHF₃/C₂F_6 gas plasmas in reactive ion etching (RIE) have been characterized by X-ray photoelectron spectroscopy (XPS). CHF₃/C₂F_6 gas plasma exposure of Si surface leads to the deposition of residual film containing carbon and fluorine. The narrow scan spectra of C 1s show various bonding states of carbon as C-Si, C-Si, C-C/H, C-CF_x(x≤3), C-F, C-F₂, and C-F₃. The chemical bonding states of fluorine are described with F-Si, F-C, and F-O. And the oxygen and silicon are also detected. The effects of parameters for reactive ion etching as CHF₃/C₂F_6 gas ratio, RF power, and pressure are investigated.