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김영서,황충연,허만용,유대인,Kim Young seo,Hwang Chung Yeun,Her Man Yong,Yoo Dae In 대한방사선사협회 1999 대한방사선사협회지 Vol.25 No.1
The detection of X-ray fluoroscopy is tedious and time-consuming for human doing. Lowering of efficiency for chest diagnosis is caused by lots mistakes of radiologist because of detecting the micro pathology from the film of small size. Therefore, in the
양끝이 열린 단층 탄소 나노튜브에 흡착된 질소에 대한 연구
유대황,김청식,황윤희,김형국,류기홍 한국물리학회 2002 새물리 Vol.45 No.1
The adsorption of N$_2$ on the open-ended single-walled carbon nanotube bundles was studied. The amount corresponding to the first coverage adsorbed on open-ended carbon nanotube bundles was three times larger than the amount adsorbed on close-ended nanotube bundles. The isosteric heat of adsorption was obtained from adsorption isotherm measurements performed at different temperatures ranging from 117 K to 130 K. The estimated heat of adsorption of nitrogen on the open-ended nanotube bundles was about twice that on the close-ended nanotube bundles. This directly leads to the conclusion that the binding energy of nitrogen on open-ended nanotubes is greater than that of nitrogen on close-ended nanotube bundles. 열린 단층 나노튜브에 흡착된 질소의 흡착에 대한 연구를 하였다. 열린 나노튜브에서 흡착된 첫 번째 층에 대응하는 질소 양의 크기는 닫힌 튜브에 흡착한 경우에 비하여 약 3배정도 증가하였다. 그리고 117 K에서 130 K 의 영역에서 등온 흡착 실험을 하여 얻은 등적 흡착열은 닫힌 나노튜브의 경우에 비해 약 두 배 더 큼을 알 수 있었다. 이것은 탄소 나노튜브의 내부에서 결합 에너지가 더 클 것이라는 이론적 예상과 일치한다.
한국 전통 누룩 미생물의 문헌적 고찰(1945년 이후를 중심으로)
유대식(Tae-Shick Yu),김정(Jung Kim),김현수(Hyun-Soo Kim),현지숙(Ji-Suk Hyun),하현팔(Hyun-Pal Ha),박문근(Moon-Geun Park) 한국식품영양과학회 1998 한국식품영양과학회지 Vol.27 No.4
한국 전통누룩은 생전분질을 조분쇄하여 물과 혼합하여 일정한 크기로 성형하여 자연계에 존재하는 미생물의 자연접종에 의하여 제조된 효소제이다. 1945년 이후 누룩으로부터 Aspergillus속의 14종과 Penicillium속의 9종이 새로 분리ㆍ동정되어 합계 12속 38종이 분리되었다. 누룩으로부터 새로 분리된 Aspergillus penicilloides와 Penicillium expansum은 생전분 소맥분 배지에서 산(酸) 생성능이 높을 뿐 아니라, amylase 활성이 높고 효소의 안정성도 3개월간 매우 안정한 누룩 사상균이였다. 누륙효모는 1945년 이전에는 분리되지 않았던 Candida속의 5종, Hansenula속의 4종, Pichia와 Schizosaccharomyces속의 각 1종이 새로 분리ㆍ동정되어 합계 8속 18종의 누룩효모가 분리되었다. 더욱이, 누룩세균은 Bacillus pumilus, Lactobacillus casei와 Leuconostoc mensenteroides의 3속 3종의 분리ㆍ동정되었다. Literatures on microorganisms of traditional Korean nuruk published since 1945 were reviewed in this paper. Traditional Korean nuruk consists of raw barley and various grains. Traditional Korean nuruk consists of unboiled raw barley and various grains. They are ground to paste and moistened, and then naturallly inoculated by airborne microorganisms. Therefore, many kinds of microorganisms such as fungi, yeast, and bacteria grow in nuruk. Since 1945, new 14 species of Aspergillus and 9 species of Penicillium have been identified from traditional Korean nuruk. Total number of fungal species identified so far is now up to 38 species among 12 different genus. Among newly isolated fungal species, Aspergillus penicilloides and Penicillium expansum showed not only high production rate of acid and amylase but also extreme stability of the enzyme at room temperature for 3 months. As examples of newly isolated yeast species, there are 5 species of Candidn, 4 species of Hansenula, 1 species of Pichia and 1 species of Schizosaccharomyces. Total number of yeast species isolated so far is up to 18 species from different 8 genus. Newly isolated bacteria, were Bacillus pumilus, Lactobacillus casei and Leuconost mnsenteroides.
Quick Phase Search Method on an Adsorbed System
유대황,김형국,류기홍,이호섭,백현종,황윤회 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The desorption rate of adsorbed nitrogen on planar graphite was measured as the change in the adsorbed amount with increasing temperature. There exist regions in which the desorption rate changes with increasing temperature, and the regions coincide with the phase boundaries of nitrogen on graphite. These regions are caused by changes in the binding energy and the heat of adsorption under a phase transition in the adsorbed system, which affects the interaction between an adsorbed particle and either neighboring particles or the substrate. Those results show that this temperature scanning adsorption method is useful for a rough search of phases and phase boundaries in an adsorbed system without the help of other auxiliary measurements such as heat capacity measurements. This method is different from the traditional isothermal adsorption process in which much effort is needed to follow measurements repeated at different temperatures and in which other experimental methods are needed to obtain information for phases and phase changes related to the phase diagram for the adsorbed system. Through this experimental method, we can easily find the phases and the phase boundaries needed to complete the phase diagram of the adsorbed system, so the method saves much time for traditional isothermal adsorption experiments.
뇌졸중 환자의 구음장애에 대한 경두개 직류 전류 자극의 효과
유대상,김대열,한은영,정승은,전민호 대한재활의학회 2010 Annals of Rehabilitation Medicine Vol.34 No.1
Objective: To investigate whether transcranial direct current stimulation (tDCS) can improve dysarthria in stroke patients. Method: Twelve patients who developed dysarthria after acute middle cerebral artery (MCA) infarction were included in this study. In a prospective, double blinded, randomized case control study performed between January 2007 and December 2008, six patients were randomized to anodal tDCS application and conventional speech therapy, and six patients were randomized to the sham group which received only conventional speech therapy. tDCS was delivered for 30 minutes at 2 mA with 25cm2, five times/week, for a total two weeks. The effects were assessed in maximal phonation time (MPT), alternative motion rates (AMR)-Pa, AMR-Ta, AMR-Ka, and sequential motion rates (SMR)-PaTaKa using the Multi-Media Dimension Voice Program. Results: Pre-treatment patient evaluation showed no significant difference between the two groups for all parameters. The MPT, AMR-Pa, AMR-Ta, AMR-Ka, and SMR-PaTaKa were improved pre- and post-treatment in the stimulation group, while MPT, SMR-PaTaKa were improved in the sham group (p<0.05). The AMR-Pa significantly improved in the stimulation group compared to the sham group (p<0.05). Conclusion: As these results demonstrated the beneficial effects of anodal tDCS on dysarthria, tDCS can successfully be used as a treatment modality for patients suffering from dysarthria after stroke. (J Korean Acad Rehab Med 2010; 34: 10-14) Objective: To investigate whether transcranial direct current stimulation (tDCS) can improve dysarthria in stroke patients. Method: Twelve patients who developed dysarthria after acute middle cerebral artery (MCA) infarction were included in this study. In a prospective, double blinded, randomized case control study performed between January 2007 and December 2008, six patients were randomized to anodal tDCS application and conventional speech therapy, and six patients were randomized to the sham group which received only conventional speech therapy. tDCS was delivered for 30 minutes at 2 mA with 25cm2, five times/week, for a total two weeks. The effects were assessed in maximal phonation time (MPT), alternative motion rates (AMR)-Pa, AMR-Ta, AMR-Ka, and sequential motion rates (SMR)-PaTaKa using the Multi-Media Dimension Voice Program. Results: Pre-treatment patient evaluation showed no significant difference between the two groups for all parameters. The MPT, AMR-Pa, AMR-Ta, AMR-Ka, and SMR-PaTaKa were improved pre- and post-treatment in the stimulation group, while MPT, SMR-PaTaKa were improved in the sham group (p<0.05). The AMR-Pa significantly improved in the stimulation group compared to the sham group (p<0.05). Conclusion: As these results demonstrated the beneficial effects of anodal tDCS on dysarthria, tDCS can successfully be used as a treatment modality for patients suffering from dysarthria after stroke. (J Korean Acad Rehab Med 2010; 34: 10-14)