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김형균,성동근,조경미,김상범,김재영,최준호,Kim, Hyong-Gyun,Sung, Dong-Keon,Cho, Kyong-Mi,Kim, Sang-Beom,Kim, Jae-Young,Choi, Jun-Ho 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.2
This study, "The study about performance evaluations of mobile cover for X-ray's diffusion and distribution in mobile radiation" is based on the rules of mobile defense apparatus for radiation producer in 2006. To use the mobile cover for X-ray for diagnosis has been compulsory in common wards except operation rooms, emergency rooms and intensive care units. we have confirmed the effect in arbitrary shielding material after Qualitiy Control was carried out for accuracy in an experiment of mobile photographing equipment. The performance evaluation was conducted with the fabrics of selenium, 0.2 mmPb, 0.1 mmPb and aluminiums. Considering the result, we choosed 0.1 mmPb and attached cover to mobile photographing equipment. We have finished making the cover after drew up the draft to attach cover to mobile photographing equipment through the modeling and the structural analysis. the process of the study is that we assembled the manufactured structures and carried out the practical experiment to take the photograph after attaching the fabric of 0.1 mmPb to mobile photographing equipment. It is need of additional thesises hereafter that we compare the result between the part to improve for safety besides convenience in photographic experiment about clinical radiation and the effect of covering the diffusion in condition attached the cover.
김형균,이언정,권용택,황광호,주홍현,송봉근,Kim, Hyeong-Kyun,Lee, Eun-Jeong,Kweon, Yong-Taek,Hwang, Kwang-Ho,Joo, Hong-Hyun,Song, Bong-Keun 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.1
The unripe fruit of Poncirus trifoliata Raf has been used for the treatment of allergic disease. Recently it was reported that the fruit inhibits passive cutaneous anaphylaxis and histamine release at mast cell. Type I immediate hypersensitivity of anaphylactic type is caused by released mediate chemical at mast cell. Histamine is also known as one of potent mediate chemical. Also release of mediate chemical is affected by specific stimulation of IgE combined with mast cell. Activation of mast cell is known to be stimulated by compound 48/80 and inhibited by increase of cAMP. In this experiment, the effect of water extract of Poncirus trifoliata Raf fruit (PT) on a histamine release, cAMP concentration and IgE production was measured. Compound 48/80 was administrated to the mouse peritoneal cell which was pretreated with PT. PT dosedependently inhibited histamine release at peritoneal mast cell and the serum level of histamine induced by compound 48/80. PT also instantly increased cAMP level of peritoneal mast cell right after it was added and the level gradually decreased. Production of IgE induced by antigens at mouse peritoneal cell was inhibited by PT. The IgE synthesis is induced by IL-4 and it is known that lipopolysaccharide(LPS) plus IL-4 cause an increase in IgE secretion by murine B cells. The effects of PT inhibited the production of IgE activated by LPS plus IL-4 at human U266B1 cells. These results indicate that PT has antiallergic activity by Inhibition of IgE production from B cells and histamine release by increase of cAMP.
김형균,이현종 ( H . K . Kim,H . J . Lee ) 한국축산학회 1974 한국축산학회지 Vol.16 No.2
This experiment was conducted to investigate the effect of freezing temperatures and storaging durations on the chemical components of different section of frozen milk. The results obtained were as follows: 1) Physical properties of milk were not affected by freezing temperature and storaging duration. 2) Fat and protein content of milk was slightly decreased but the change was considered to be caused by the separation of caseinate system and destruction of fat emulsion. 3) Fat distribution of milk was concentrated in the top layer while that of homogenized milk was concentrated in the bottom layer. Pasteurized milk showed more uniform distribution of fat when frozen at -20℃ than at -10℃. 4) Protein distribution of frozen milk whether pasteurized or homogenized was concentrated in the bottom layer when defrosted. The same trends were obtained for the distribution of acid casein, whey protein, 12% T.C.A. precipitated protein and 12% T.C.A. soluble protein.
탄소나노 튜브위에 성장된 Pd 및 Pt 나노 입자의 제조 및 특성
김형균,이임렬,Kim, Hyung-Kun,Lee, Rhim-Youl 한국재료학회 2009 한국재료학회지 Vol.19 No.4
Carbon nanotubes (CNT) were used as a catalyst support where catalytically active Pd and Pt metal particles decorated the outside of the external CNT walls. In this study, Pd and Pt nanoparticles supported on $HNO_3$-treated CNT were prepared by microwave-assisted heating of the polyol process using $PdCl_2$ and $H_2PtCl_6{\codt}6H_2O$ precursors, respectively, and were then characterized by SEM, TEM, and Raman. Raman spectroscopy showed that the acid treated CNT had a higher intensity ratio of $I_D/I_G$ compared to that of non-treated CNT, indicating the formation of defects or functional groups on CNT after chemical oxidation. Microwave irradiation for total two minutes resulted in the formation of Pd and Pt nanoparticles on the acid treated CNT. The sizes of Pd and Pt nanoparticles were found to be less than 10 nm and 3 nm, respectively. Furthermore, the $SnO_2$ films doped with CNT decorated by Pd and Pt nanoparticles were prepared, and then the $NO_2$ gas response of these sensor films was evaluated under $1{\sim}5\;ppm$ $NO_2$ concentration at $200^{\circ}C$. It was found that the sensing property of the $SnO_2$ film sensor on $NO_2$ gas was greatly improved by the addition of CNT-supported Pd and Pt nanoparticles.