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Ion Implantation과 Ion Plating법으로 제작한 반도체 태양전지 및 방사선 검출기의 물리적 성질과 그응용에 관한 연구(Ⅱ)
조철우,황정남,고년규,정원모,이철주,우정주 연세대학교 자연과학연구소 1983 學術論文集 Vol.11 No.-
p형 Si에 Li^+이온을 가속기를 사용하여 이온 주입시킨후 열자극 전류(TSC)를 측정하여 양공 에너지 준위, 양공 방출율, 양공 포획 단면적 등을 결정하였다. 161K에서 하나의 TSC peak가 형성되었으며 이 peak가 hole trap임을 확인하였고, 이 peak에 대한 E_p, B_p 및 σ_p는 각각 0.264±0.028 eV, 4.11×10^4_s^-1K^-2 및 2.32×10^-17cm^2이었다. 이 trap은 divacancy나 [Li_I+O+V] defect에 의한 것으로 추측하였다. Hole trap energy level, hole emission rate, hole capture cross section and trap charge state are investigated from TSC curves of p-type Si implanted with low energy (<20 keV) Li^+ ions from a low energy accelerator which was designed and constructed in this research. When a reverse bias voltage of 20 V is applied during cooling and light excitation, the TSC curve shows a peak at 161K and the value of δ/ω is 0.57, which means that the TSC is due to a 2nd kinetic order mechanism. The values of the parameters E_p, B_p, and σ_p are 0.264±0.028 eV, 4.11 × 10^4_s^-1K^-2 and 2.32 × 10^-17㎠, respectively. This hole trap may be due to the divacancy or the [Li_I + O + V] defect.
정택균,김경훈,Dong-Woo Joh,Kyu-Young Heo,이효수,Sung-Chul Lim,권혁천 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6
The tensile properties of a Cu/Ni fine clad prepared by surface activation bonding were investigated as a function of the heat-treatment temperature and the diffusion layer thickness. A negligibly thin diffusion layer, less than 5 nm in thickness, was formed in the as-bonded Cu/Ni fine clad, but the thickness increased significantly after subsequent heat treatments. As the temperature increased, the yield strength and tensile strength increased; this was attributable to the microstructural features of the raw materials. The yield strength values calculated using a rule-of-mixture model were lower than those determined experimentally. We attributed this difference in the values to the diffusion layer and friction at the interfaces between the various phases. The friction strength of the copper/nickel foils was higher than those of the copper foil/diffusion layer and the nickel foil/diffusion layer. The results of the study suggested that the tensile properties of the Cu/Ni fine clad were affected by the following: (1)the volume fraction of the raw materials and their individual strengths, (2) the volume fraction of the diffusion layer and its strength, and (3) the friction strength at the interfaces of the various phases.
Highly pathogenic avian influenza (H5N1) in the commercial domestic ducks of South Korea
Kwon, Yong-Kuk,Joh, Seong-Joon,Kim, Min-Chul,Sung, Haan-Woo,Lee, Youn-Jeong,Choi, Jun-Gu,Lee, Eun-Kyoung,Kim, Jae-Hong Taylor Francis 2005 Avian pathology Vol.34 No.4
<P>The present study reports the clinical, virological and pathological findings observed in a natural outbreak of highly pathogenic avian influenza in farmed commercial ducks. The ducks developed clinical signs, including mild respiratory distress, depression, mild diarrhoea, loss of appetite and increasing mortality (up to 12%). At necropsy, multifocal mottled necrosis was commonly found in the pancreas with splenomegaly, hepatomegaly, and swollen kidneys. Microscopically, there was necrotized pancreatitis and hepatitis, and lymphocytic meningoencephalitis and myocarditis. Influenza viral antigen was demonstrated in areas closely associated with histopathological lesion. Avian influenza virus was isolated from the caecal tonsil, faeces, and kidney of the domestic ducks. The isolated virus was identified as a highly pathogenic H5N1, with a haemagglutinin proteolytic cleavage site deduced amino acid sequence of … QREKRKKR/GLFGAIAG … In order to determine the pathogenicity of the isolate, eight 6-week-old specific pathogen free chickens were inoculated intravenously with the virus, and all birds died within 24  h after inoculation. This is the first report of an outbreak of highly pathogenic avian influenza with clinical signs in commercial domestic ducks in South Korea. Influenza Aviaire Hautement Pathogène (H5N1) chez des canards domestiques en Corée du Sud La présente étude rapporte les résultats des observations clinique, virologique et pathologique réalisées à partir d'un élevage de canards qui a présenté un cas spontané d'influenza aviaire hautement pathogène. Les symptômes développés par les canards incluaient une affection respiratoire bénigne, de la dépression, une légère diarrhée, une perte d'appétit, et une augmentation de la mortalité (jusqu'à 12%). A l'autopsie, une nécrose marbrée multifocale à généralement été observée au niveau du pancréas avec une splénomégalie, une hépatomégalie et des reins gonflés. Sur le plan microscopique, il a été noté une hépatite et une pancréatite nécrosées, ainsi qu'une méningo-encéphalite et une myocardite lymphocytaires. L'antigène viral de l'influenza a été mis en évidence dans des zones étroitement associées aux lésions histopathologiques. L'AIV a été isolé à partir des amygdales cæcales, des fèces et des reins des canards domestiques. Le virus isolé, a été identifié comme étant H5N1 hautement pathogène, avec la séquence déduite en acides aminés du site de clivage de l'hémagglutinine protéolytique : “…  QREKRKKR/GLFGAIAG  …’. Afin de déterminer la pathogénicité de l'isolat, des poulets, exempts de microorganismes pathogènes spécifiés, âgés de 6 semaines ont été inoculés par voie intraveineuse avec le virus et tous les animaux sont morts dans les 24 heures après l'inoculation. Ceci est le premier rapport d'un cas de HPAI avec des signes cliniques chez des canards d'élevage en Corée du Sud. Hochpathogene aviäre Influenza (H5N1) in kommerziellen Hausenten in Südkorea Die vorliegende Studie berichtet über die klinischen, virologischen und pathologisch-anatomischen Befunde im Rahmen eines natürlichen Ausbruchs einer hochpathogenen Influenza (HPAI) bei kommerziell gehaltenen Enten. Die klinischen Symptome der Enten umfassten geringradige Atemnot, Störung des Allgemeinbefindens, milde Diarrhoe, Appetitlo
김병수,이승철,박경찬,권태은,유재학,유희준,조광열,고우석,안종성,임정구,여운철 대한피부과학회 1998 대한피부과학회지 Vol.36 No.6
Background : Vitiligo is an acquired depigmentary disorder of the skin and hair. The etiology is unknown, however an autoimmune hypothesis is favored. Objective : We performed this study to develop a better understanding of the clinical features of vitiligo patients. Method : We evaluated clinical manifestations of 1203 vitiligo patients(556 males and 647 females). Results and Conclusions : 1. The mean age of onset and that of the first visits made by patients were 22.9±18 and 27.9±19 years, respectively. 2. The face(37.4%) was the most common site of initial involvement. In decreasing order of frequency, the common sites of involvement were the face and neck(65.9%), thorax and abdomen(42.9%), upper extremities(42.3%). 44.5% of the cases had the vulgaris type, 26.1% the focal type, and 21.1% the segmental type. During the three months before a visit, 44% of patients experienced progression of disease. Within one year, about 75% of patients reported that the disease had progressed. 3. Precipitating or aggravating factors such as trauma(13.1%), psychological stress(9.2%), sun light (2.8%) and pregnancy(2.5%), were found in 30.9% of patients. Thyroid disease was the most common associated disease.
방사선치료계획을 위한 PET 종양용적 결정 연구: 컴퓨터 모의실험
윤석남,조철우,이재성,Yoon Seok Nam,Joh Chul-Woo,Lee Jae Sung 한국의학물리학회 2005 의학물리 Vol.16 No.4
PET 기기의 보급이 급속도로 증가하고 있으며 여러 임상 및 연구 분야에서 그 유용성이 입증되어 널리 이용되고 있다. 이 가운데서도 종양 진단 분야에서 PET의 활용도는 매우 높아 대부분의 PET검사를 종양 검사가 차지하고 있으며 특히 양성과 악성종양의 감별, 종양의 치료효과 판정 및 종양의 재발진단 등에 널리 이용되고 있다. 최근에는 PET과 CT를 결합한 PET-CT의 사용이 증가됨에 따라 방사선치료분야에서 PET의 활용에 대한 관심이 커지고 있다. 방사선치료를 위한 종양의 경계를 결정하기 위하여 해부학적인 영상인 CT를 이용하는 것이 보편적이나 이 경우 실제 암조직에 상관없이 모양만을 기준으로 삼으므로 암조직에 대한 방사선 치료 용량이 많거나 적을 수 있어 적절한 치료가 되지 않을 수 있다. 따라서 PET을 이용한 기능적이고 살아 있는 암조직의 정확한 용적 측정은 적절한 치료 지표를 줄 수 있어 매우 중요한 일이나 상대적으로 낮은 공간해상도에 의해 정확한 경계를 결정하기 어려운 문제가 있다. 이 연구에서는 실제 종양의 용적을 구할 수 있는 영상화소 값의 역치가 변변의 크기, PET 기기의 공간해상도, 병변 대 주변 섭취비에 어떠한 영향을 받는지를 평가하기 위한 컴퓨터 모의실험을 수행하였다. The utilization of PET has been increased so fast since the usefulness of the PET has been proved in various clinical and research fields. Among the many applications, the PET Is especially useful in oncology and most of the clinical PET scans are peformed for the oncologic examination Including the different diagnosis of malignant and benign tumors and assessment of the treatment effects and recurrent tumors. As the PET-CT scanners are widely available, there is Increasing interest in the application of the PET Images to the radiation treatment planning. Although the CT images are conventionally used for the target volume determination in the radiation treatment planning, there are fundamental limitation In use of only the anatomical information. Therefore, the volume determination of the functionally active tumor region using the PET would be important for the treatment planning. However, the accurate determination of the tumor boundary is not simple in PET due to the relatively low spatial resolution of the currently available PET scanners. In this study, computer simulations were peformed to study the relationship between the lesion size, PET resolution, lesion to background ratio and the threshold of Image Intensity to determine the true tumor volume.