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한국에서의 Human T-Cell Leukemia Virus Type-1(HTLV-1)에 대한 혈청학적 및 역학에 관한 연구
이영열,이성열,김은실,이홍복,김병국,이문호,박선양,김노경,서철원,규경채,최강원,조한익,고월청,야마구찌이찌세이 대한내과학회 1986 대한내과학회지 Vol.31 No.2
Type-C retrovirus, human T-cell leukemia virus type-l(HTLV-1), has been shown to be associated etiologically with adult T-cell leukemia, which is an endemic disease in southwestern parts of Japan. We examined the seroepidemiological characteristics of antibody to adult T-cell leukemia virus associated antigen (anti-ATLA-antibody) by the indirect immunofluorescent assay and ELISA from the healthy individuals and various diseased patients in the Republic of Korea, a country adjacent to Japan in which HTLV-1 is endemic. The results were as follows. 24 out of 9,603 individuals(0.25%) were seropiositive. The positve rate was 0.17% in males and 0.36% in females, the sex difference was female predominent relatively. HTLV-1 carriers were found 16 individuals in Seoul, 5 in Kyonggi area, 1 in Chungnam and Jonbuk, respectively, but found only 1 individual in Busan city and Jaejoo area close to southwestern parts of Japan. Positive rate to anti-ATLA-antibody seemed to be high in older age, especially at the 50s(0. 4Yo). In conclusion the prevalence rate of anti-ATLA- antibody seemed to be very low in the Republic of Korea adjacent to Japan in which HTLV-1 is endemic and no patient with adult T-cell leukemia has been found as yet. Also we noted that the Republic of Korea is not an endemic area to HTLV-1.
Effects of Plastic Strain and Strain Path on Young's Modulus of Sheet Metals
Yamaguchi, K .,Adachi, H .,Takakura, N . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
The effects of plastic strain and strain path on Young's modules of sheet metals are experimentally investigated using low carbon steel, stainless steel, aluminium, copper and brass sheets of 1 mm thickness. These sheets are firstly deformed to different plastic strains under a few strain paths from balanced biaxial stretching to uniaxial tension. Then, a small uniaxial tension test specimen is cut from each deformed sheet and Young's modules is measured using electrical-resistance strain gauges glued to both surfaces of the specimen. The experimental results show that Young's moduli of the low carbon steel and stainless steel sheets decrease with increasing plastic strain, while those of aluminium, copper and brass sheets hardly change with the plastic strain. In all materials, however, the effect of the strain path on Young's modules is not necessarily evident. It is confirmed that Young's modules of the low carbon steel sheet can be recovered to the initial value of undeformed sheet by a subsequent annealing. In addition to Young s modules, the effects of the plastic strain and the strain paths on Poisson's ratio of these materials are also shown.
Experimental investigation of a linear-chain structure in the nucleus <sup>14</sup>C
Yamaguchi, H.,Kahl, D.,Hayakawa, S.,Sakaguchi, Y.,Abe, K.,Nakao, T.,Suhara, T.,Iwasa, N.,Kim, A.,Kim, D.H.,Cha, S.M.,Kwag, M.S.,Lee, J.H.,Lee, E.J.,Chae, K.Y.,Wakabayashi, Y.,Imai, N.,Kitamura, N.,Lee North-Holland Pub. Co 2017 Physics letters. Section B Vol.766 No.-
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α-cluster states in the radioactive <SUP>14</SUP>C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
Research on Optimization Design of High Efficient Low Noise SiC-MOSFETs Inverters
K. Yamaguchi,K. Katsura 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents an optimized design example of high efficient inverter which consists of Silicon- Carbide (SiC) Metal-Oxide-Semiconductor-Field-Effect- Transistor (MOSFET) and optimized gate driver for SiCMOSFETs. The purpose of this research is to optimize design of SiC-MOSFETs inverters. We confirmed that the proposed inverter is capable of operating efficiently with experimental results. The proposed gate driver can reduce switching losses and switching time without increasing surge and ringing voltage. We also analyzed effects of removing Schottky-Barrier-Diode (SBD) from SiC-MOSFETs power modules. Removing SBDs gives some positive effects that can not only reduce cost and size of inverters, but also can reduce switching surge and ringing voltage. SiC-MOSFETs without SBDs have bigger damping coefficient and smaller junction capacitance than SiC-MOSFETs with SBDs. The bigger damping coefficient can reduce ringing voltage. The smaller junction capacitance can reduce switching losses and noise.
Study on α-cluster levels in non-4n nuclei using low-energy RI beams
Yamaguchi, H,Kahl, D,Hayakawa, S,Sakaguchi, Y,Abe, K,Nakao, T,Suhara, T,Iwasa, N,Kim, A,Kim, D H,Cha, S M,Kwag, M S,Lee, J H,Lee, E J,Chae, K Y,Wakabayashi, Y,Imai, N,Kitamura, N,Lee, P,Moon, J Y,Lee, IOP Publishing 2017 Journal of physics. Conference series Vol.863 No.-
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.