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Yang, S.J.,Je Lee, W.,Kim, E.A.,Dal Nam, K.,Hahn, H.G.,Young Choi, S.,Cho, S.W. North-Holland ; Elsevier Science Ltd 2014 european journal of pharmacology Vol.736 No.-
Thiazole derivatives are attractive candidates for drug development because they can be efficiently synthesized and are active against a number of diseases and conditions, including diabetes. In our present study, we investigated the anti-inflammatory and antioxidant properties of N-adamantyl-4-methylthiazol-2-amine (KHG26693), a new thiazole derivative, in a streptozotocin (STZ)-induced model of diabetes mellitus. STZ-induced diabetic rats were intraperitoneally administered KHG26693 (3mg/kg-body weight/day) for 4 weeks. KHG26693 administration significantly decreased blood glucose, triglycerides, and cholesterol and increased insulin. KHG26693 also suppressed several inflammatory responses in STZ-induced diabetic rats, as evidenced by decreased levels of serum tumor necrosis factor-α, interleukin-1β, and nitric oxide. Additionally, KHG26693 significantly modulated hepatic lipid peroxidation, catalase and superoxide dismutase activity, and the nonenzymatic antioxidant status (e.g., vitamins C and E), and reduced the glutathione content. These anti-inflammatory/antioxidative actions occurred as a result of the downregulation of inducible nitric oxide synthase and nuclear factor-kappa B. Taken together, our results suggest that KHG26693 successfully reduces the production of oxidative stress in STZ-induced diabetic rats by regulating the oxidation-reduction system, specifically increasing antioxidant capacity. Furthermore, KHG26693 treatment significantly reverted the key enzymes of glucose metabolism, such as glucokinase, glucose-6-phosphatase, glycogen synthase, glycogen phosphorylase, and fructose-1,6-bisphosphatase, to near-normal levels in liver tissues. These results indicate that KHG26693 normalizes disturbed glucose metabolism by enhancing glucose utilization and decreasing liver glucose production via insulin release, suggesting the possibility of future diabetes treatments.
반응성 증착 및 활성화 반응성 증착에 의한 질화물 피막의 구조 및 성질에 관한 연구
한봉희,윤의준 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.4
In this experiment, titanium nitride films were deposited by Activated Reactive Evaporation at low substrate temperature, and these were characterized by (1) phase identification, lattice parameter determination, and preferred orientation from X-ray diffraction, (2) observation of microstructures of the surface and the fractured cross section of the deposits, and (3) microhardness testing. From the results of the characterization, conditions for the formation of titanium nitrides and overall physical properties were discussed. Kinds of the phases present in the deposits could be predicted by the relative ratio of deposition rate to gas pressure, and the lattice parameter of TiN increased as the nitrogen gas pressure increased, and the deposits were under residual compressive stress condition. TiN in the deposits showed a strong (111) preferred orientation and the microhardness of the deposits increased as more Ti₂N phase were present in the deposits. Deposits belonged to zone 1 of Movchan-Demchishin model, judged from the microstructure of the surface and the fractured cross section, as were observed the longitudinal porosities several hundres A wide between tapered crystallites. Size of the domes in the surface increased as the deposition rate increased and differences in fracture mode were observed between TiN deposits and TiN+Ti₂N deposits.
플라즈마 물리증착에 의한 (Ti, Al) N 피막의 조직 및 성질에 미치는 플라즈마 조건의 영향
한봉희,전중환,임재은 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.3
There has been a great interest recently in the deposition of hard coatings on tools by physical vapor deposition processes. In this study (Ti, Al)N films were deposited onto high speed steels by biased activated reactive evaporation, varying plasma conditions during deposition. Electron density and electron temperature of glow discharge plasma during deposition were measured using a single electric probe technique. Discharge current of auxiliary electrode was a key parameter to control the plasma density. The films were characterized by x-ray diffractometry in order to determine phase, preferred orientation, mean microstrain, lattice parameter, and grain size. The film morphology was observed by scanning electron microscopy. Microhardness and adhesion strength were also measured. Electron density increased with discharge current of auxiliary electrode and average electron energy showed little variation. As the substrate bias voltage increased (200) texture developed and grain size decreased, while mean microstrain decreased and lattice parameter increased, all showing minimum or maximum values at-1000V bias. Microhardness increased with and adhesion was improved by substrate biasing. Also impact indentation modes showed the same tendency. All results would be caused by ion bombardment effects during deposition.
활성화 반응성 증착에 의한 탄화물 막 구조 및 성질에 관한 연구
한봉희,송요승,윤의준 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.6
TiC films, through A.R.E. (Activated Reactive Evaporation), were deposited on 304 stainless steel substrate. The structure and properties of TiC films were analyzed according to the substrate temperatures and the partial pressures of the reactive gas (C₂H₂). Coated surfaces and cross sections were examined by S.E.M., and the pole intensity were measured by x-ray diffraction. Hardness was measured by a Micro Vickers Hardness Tester with 10 gr load. Surface structure was of micro-dome structure at low temperature (=0.23 T_m) and the micro-dome structure changed to smooth dome-structure at 650℃ (=0.28 T_m). The intergrated pole intensities of (200) and (220) increased with temperature, but that of (111) were strong at all temperatures. Hardness decreased from 3000 to 1875 ㎏/㎟ and C/M ratio decreased from 0.701 to 0.667, with decreasing temperature and partial pressure.
이흥수,한은주,백경선,옥항남 연세대학교 자연과학연구소 1985 學術論文集 Vol.14 No.-
비정질강자성체 Fe_80B_20의 뫼스바우어 스펙트럼을 액체질소 온도로부터 541K까지 여러 온도에서 취하였으며 이것을 분석하여 각 온도에서의 초미세자기장의 분포와 전기사중극자분렬의 분포로 인한 선폭증가의 분포 및 이성질체이동의 분포를 계산하였다. 또한 이와 같은 세가지 분포로 인한 뫼스바우어 공명흡수건의 선폭증가를 비교해 본 결과 6선 스펙트럼의 경우, 외곽의 네선에 대해서는 초미세자기장의 분포로 인한 선폭증가가 전기사중극자분렬의 분포로 인한 것보다 크나 두개의 내부선의 경우는 오히려 전기사중극자분렬의 분포로 인한 선폭증가가 더 컸다. 이성질체이동의 분포로 인한 선폭증가는 어느 선의 경우에도 제일 작았다. Mo"ssbauer spectra of amorphous ferromagnet, Fe_80B20 have been taken at various temperatures ranging from liquid nitrogen temperature to 541K, and analyzed to calculate distributions of the hyperfine field, isomer shift, and quadrupole broadening. Comparison of line broadenings due to the three kinds of distributions indicates that the four outer lines in six-line pattern are broadened much more by the distribution of the magnetic hyperfine field than by that of the quadrupole splitting whereas the two inner lines are broadened more by the distribution of quadrupole splitting. The line broadening due to the distribution of the isomer shift is smallest for any line of a six-line pattern.
Study of a-cluster Structure in 22Mg Using a Radioactive Ion Beam
차수미,K. Y. Chae,김민주,M. S. Kwag,E. J. Lee,K. Abe,S. Hayakawa,H. Shimizu,H. Yamaguchi,L. Yang,S. H. Bae,S. H. Choi,D. N. Binh,N. N. Duy,Z. Ge,V. H. Phong,K. I. Hahn,B. Hong,B. Moon,N. Iwasa,D. Kahl,L. H. 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
The ff-clusterization of an atomic nucleus has been studied for a long time, even from the earliest days of nuclear physics. Our understanding of the ff-cluster structure is, however, mainly limited to the self-conjugate A = 4n (n = 2; 3; 4; ) light nuclei and some of the neutron-rich radionuclides such as 10Be, 11B, and 14C. In order to study the ff-cluster structure of a neutron-deficient 22Mg nucleus, we have measured the 18Ne(ff, ff)18Ne scattering in inverse kinematics by using radioactive 18Ne beams and the 4He gas target at the Center for Nuclear Study radioactive ion beam separator of the University of Tokyo. Recoiling ff particles from the scattering were detected by using silicon strip detectors, which constitute E-E telescopes for particle identification. By adopting a thick target method, we were able to investigate a wide range of excitation energies Ex = 9:9 - 16.5 MeV in 22Mg in this work.