Glow Discharge 증착법에 의한 a-Si:H 박막의 Doping 효과 및 비정질 Si 태양전지 제작에 관한 연구

지일환,염덕선,최범식,김수길,고년규 연세대학교 자연과학연구소 1983 學術論文集 Vol.12 No.-

GDa-Si:H박막의 전기전도도 σ, 활성화에너지 ΔE, 광흡수계수 α 및 optical oprtical gap energy E_g(opt.)를 측정하여 전기적, 광학적 성질을 조사하였다. 또한 이들 박막의 광전기력 응용으로서 a-Si:H ITO/_(p-i-n)접합 태양전지를 제작하여 광전기력 현상을 관찰하였다. The electrical and optical properties of GD a-Si:H films have been investigated to obtain electric conductivity σ, activation energy ΔE, optical absorption coefficient α, and optical gap energy Eg(opt.). As a photovoltaic application of GD a-Si:H film, amorphous silicon ITO/p-i-n heteroface solar cells have been fabricated and the photovoltaic characteristics of the solar cells have be studied.

연쇄상구균을 실험감염시킨 넙치치어의 병리조직학적 관찰

조성환,류시윤,김현수,박배근,김덕환,손화영,윤원기,신창호 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-

Pathological observations were examined after abdominal inoculation in 7∼8㎝ sized flounder (Paralichthys olivaceus) with 1X10^7 cfu/㎖ of Streptococcus faecalis. The infected flounder were clinically observed and weighed a fish body at 0, 5, 10, 15, 20, 25, 30 days post inoculation. In infected group, mortality were 70% and feed efficiency were 7.2%. In non-infected group, mortality were 10% and feed efficiency were 18.2%. Macroscopically, the significant lesions were characterized by protrusions and opacity of the eyes and ulcer of the caudal pecuncle. Histopathologically, the lesions were observed a degeneration. necrosis and inflammatory cells in muscle of the caudal peduncle and a degeneration and necrosis of the rod cells and detached retina from the black pigmented layer

개에서 관찰된 모기질세포종의 증례보고

조성환,손화영,김혜성,최종윤,류시윤,박배근,윤원기,홍성혁,김덕환 충남대학교 수의과대학 동물의과학연구소 2002 動物醫科學硏究誌 Vol.10 No.-

Pilomatricoma was histopathologically diagnosed in a 2.5-year-old male Alaskan malamute. The patient was referred to Chungnam National University, Veterinary Medical Teaching Hospital with solitary, firm and well-circumscribed mass at shoulder. Grossly, the mass was dome shaped to tumor like and 10 x 8 x 5㎝ in size. Some lesions had gritty or bony consistency and was chalky when sectioned Histopathologic feature included mumerous clusters of tightly arranged, basaloid cells with evenly distributed chromatin and ghost cells were characterized by a central unstained zone. The ghost cells often become calcified and osseous metaplasia was also present.

중성자에 조사된 원자로 압력용기 재료의 Barkhausen 노이즈에 관한 연구

옥치일,김장환,박덕근,홍준화,이종규 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 자기이력곡선과 Barkhausen noise amplitude(BNA), Barkhausen noise energy(BNE) 및 미세경도 변화를 측정하여 이들 사이의 상관관계를 구하였다. 중성자 조사에 의하여 자기이력곡선은 변화가 없었으며, BNA, BNE 및 경도는 중성자 조사량에 따라 세 단계의 변화를 보였으며, 중성자 조사량이 10 n/㎠에서는 급격히 변하여 이들 사이의 상관관계가 있음을 알 수 있었다. 따라서 BNA와 BNE가 중성자 조사에 의한 재료의 미세 구조 결함을 조사하는데 비파괴적인 방법으로 가능성이 있음을 알 수 있었다. Hysteresis loop, Barkhausen noise(BN), and hardness were measured in the neutron irradiated RPV steel for various fluence, irradiated dose up to 10 n/㎠. The coercivity, remanence and maximum induction of neutron irradiated samples did not change significantly, but the BNA and BNE were decreased as the neutron irradiation increased. The changes of BNE and BNA were characterized by three stages with respect to neutron dose. The BNA and BNE were decreased with an increase of neutron dose to 10 n/㎠, and remained nearly constant up to 10 n/㎠, then were decreased rapidly with an increase of the neutron dose above 10 n/㎠. On the other hand, the hardness was observed revesely with the change of BNA and BNE.

마우스에서 오존수의 급여가 쥐와포자충 감염에 미치는 영향

박배근,김덕환,류시윤,김현수,조성환,전무형 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

Ozone is very effective in acute and chronic viral disease as a virucidal agent in reversing positive antibody tests and in improving the general health of the animals. The effects of ozonized water supply against Cryptosporidium muris was studied in 5-weeks-old mice. After oral inoculation of mice with 1×10^6 oocysts, ozonized water(0.5ppm) and tap water were supplied to experimental and control group, respectively. The prepatent period of both group was 8 days postinoculation(PI). The patent period of experimental group was longer(62days) than that of experimental group(57days). The number of oocysts in the feces were maxium on days 28 PI, indicating 3.54×10^6 oocysts/experimental mouse and 5.56×10^6 oocysts/ control mouse. The number of discharge oocysts during 12-33 PI was more in control group than that of experimental group. In the view of gastric gland section on days 28 PI, the number of endogenous development of C muris was smaller in experimental group than in control group. This results indicates that the autoinfected sporozoite were damaged by ozone.

개에서 발생한 다발성 림프종 치료 증례

서영민,이영원,김덕환,조성환,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2008 動物醫科學硏究誌 Vol.15 No.1

A 7 years old intact male Maltese dog with masses on the neck region, intraabdominal and popliteal region was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Neck and popliteal masses were symmetrical. Right neck mass size was 4 cm in width, 3 cm in length and 3 cm in height and left neck mass size was 3.5 cm in width, 3 cm in length and 3 cm in height. This case was diagnosed as the multicentric lymphoma by physical examination, laboratory examination, radiography, ultrasonography, CT, fine needle aspiration and histopathologic examination. The dog followed by treatment with L-CHOP protocol. The dog revealed that complete remission duration(CRD), first remission duration(FRD), second remission duration(SRD) and survival time was 7days, 115days, 99days and 214days, respectively.

중성자에 조사된 원자로 압력용기 재료(SA508)의 Magneto-acoustic emission 효과

홍준화,박덕근,옥치일,김장환,이종규 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70 ℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 미세경도 변화와 magneto-acoustic emission(MAE) 에너지를 측정하였다. 중성자 조사에 따른 경도의 변화는 조사량이 10 /㎠까지는 거의 일정하였으나, 조사량이 10 /㎠이상에서 급격히 증가하였다. MAE 에너지의 변화는 중성자 조사량에 따라 경도의 변화와 같은 형태로 변하였으나 그 변화량은 감소하여 그변화의 추이는 경도의 변화와는 역의 형태였고, 또한 MAE에너지의 상대적 변화와 경도 변화사이에는 아주 좋은 선형성을 보였다. 이러한 결과에서 SA508 강재는 10 /㎠이상의 중성자에 조사될 경우에 재료에 중성자 조사에 의한 미세 결함이 급격히 증가하여 전위(dislocation)이동에 대한 저항성을 나타내는 마찰경화의 증가가 경도의 증가를 유발하고, 또한 이러한 미세 결함은 자기장과의 반응에서는 90°자벽의 운동중에 자기탄성 변화를 유도하여 MAE 에너지의 감소를 유발함을 알 수 있었다. 그리고 경도의 변화량보다 MAE 에너지의 변화량이 더 크게 나타나, 중성자 조사에 의한 미세결함은 기계적 성질보다 자기적 성질에 더 민감하게 반응한다는 것을 알 수 있었다.따라서 MAE가 중성자 조사에 의한 재료의 미세 구조 결함을 비파괴적인 방법으로 평가하는 강력한 도구의 가능성이 있음을 알 수 있었다. Magneto-acoustic emission (MAE) energy and hardness were measured in the reactor pressure vessel steel (SA508 Steel) for the various neutron fluence, irradiated dose up to 10 n/㎠. The hardness was nearly a constant up to 10 n/㎠, but it was rapidly increased with an increase of the neutron irradiation above 10 n/㎠. It may be considered that the increase of hardness is due to the hindrance of dislocation motion induced defect clusters by irradiation. On the other hand, the MAE energy was slowly decreased as the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation above 10 n/㎠. The decrease of the MAE energy may be considered as an increase of the defect clusters which is very sensitive to the 90°domain wall motion. Furthermore, the change of MAe energy and hardness had nearly a linear relationship, but the change of MAE energy was more significant than the change of the hardness. Therefore, MAe may be considered as a very useful technique for the nondestructive evaluation of irradiation damage.

젖소 足皮膚炎에 대한 오존수의 治療 效果

이수진,조성환,전무형,김덕환,박창식,한홍율,김명철 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10

This study was carried out to determine therapeutic the effect of ozonated water therapy on bovine pododermatitis. In addition, bactericidal effect of ozonated water on etiological agent of bovine pododermatitis was examined. The pathohistological examination for the pododermatitis, according to application with ozonated water and ozone ointment was investigated. Thirty healthy cattle were divided two groups(each of 15) : control group (povidone group), treatment group (ozone solution group). Various parameters were evaluated in terms of the lameness score, swelling score, lesion score, WBC count, neutrophil count, pathohistological finding, and antimicrobial action. The decrease of lameness and lesion score were shown in hoof lesions on 14 days after application of ozonated water. Significant decrease of swelling was shown in hoof lesions on 14 days 1 Corresponding author after application of ozonated water(p < 0.01). In hematological findings, WBC count revealed values within normal range. The number of neutrophils was slightly higher than that of normal, however, this was improved on 14 days after application of ozonated water. In pathohistological findings, recovery was rapid macroscopically and microscopically in the treatment with ozonated water on the hoof lesions and ozonated water was effective. In antimicobial action, bactericidal effect was observed in treatment with ozonated water on the hoof lesions and ozonated water was effective.

젖소 足皮膚炎에 대한 오존연고의 治療 效果

이수진,전무형,조성환,김덕환,박창식,김명철 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10

Thirty dairy cows with pododermatitis were selected and treatment effect of ozone ointment for bovine pododermatitis was investigated. In addition, bactericidal effect of ozone ointment on etiological agent of bovine pododermatitis was evaluated. The pathohistological examination for the pododermatitis, according to application with ozone ointment was investigated. Thirty dairy cows were divided two groups: control group(vaseline group: 15 cows), treatment group(ozone ointment group: 15 cows). Various parameters were evaluated in terms of the lameness score, swelling score, lesion score, WBC, neutrophil, pathohistological finding, and antimicrobial action. As compared with vaseline group, ozone ointment group revealed significant decrease of lameness (p<O.05), swelling (p<O.O1) and lesion score (p<O.05) were shown in hoof lesions on 14 days after application. In hematological findings, WBC count revealed slightly high values within normal range before treatment, however, this was I Corresponding author improved on 14 days after application of ozone ointment. The number of neutrophils was slightly higher than that of normal, however. this was improved on 14 days after application of ozone ointment. In pathohistological findings, normal dermal tissue was found in tissues with pododermatitis on 14 days after application of ozone ointment. In antimicobial action, marked decrease rate of bacteria was observed in feet of all cases treated with ozone ointment. The decreasing rate of bacteria in anaerobic culture was higher than that in aerobic culture.

Scanning Electron Microscopical Findings of Thelazia callipaeda from a Domestic Dog

Kim, Joo-Taek,Cho, Sung-Whan,Kim, Hyun-Soo,Ryu, Si-Yun,Jun, Moo-Hyung,Kim, Duck-Hwan,Park, Bae-Keun 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

시베리안 허스키의 오른 쪽 눈에서 충체를 분리하였다. 충체는 선충으로 크림색-흰색을 띠고 있었으며 양쪽 끝이 가느다랗다. 크기는 수컷이 0.35x11㎜, 암컷은 0.45x15㎜에 달하였다. 암컷은 음문이 식도-장 연접부의 앞에 위치하고, 수컷에는 교접자(spicule)가 있고 항문 앞쪽에 5쌍의 유두가 존재하므로 T callipaeda로 동정하였다. 전단에는 좁은 각질 가로줄무늬가 있으며, 구강 개구부 아래에는 평활한 부분이 있었다. 개구부의 내측 표면에는 여섯 방향의 대칭 구조가 있는데 미발달된 6개의 입술로 여겨진다. 주머니 모양의 한 쌍의 쌍기가 입 바깥쪽에서 관찰되었다. 구강바닥에 있는 식도 내강의 입구는 3각형이었다. 개구부의 바깥 가장자리에서는 4 쌍의 유두가 관찰되었고, 몸통 전체에 걸쳐 각질 가로줄무늬를 볼 수 있었다. 가로줄무늬에는 촘촘한 주름들이 있었으며 이들은 가로줄무늬에 직각으로 배열되어 있었다. 충체의 후단에는 한 쌍의 phasmid가 관찰되었다. 경부유두는 음문 전방에 양측으로 종선의 선상에 위치하며 측선은 충체의 측면으로 주행하였다. 암컷의 경우, 음문은 식도-장 연접부의 앞쪽에 위치했다. 수컷의 경우, 꼬리는 감겨 있으며, 항문은 복측에서 볼 수 있었고, 항문 앞쪽에는 5쌍의 유두가, 항문 뒤쪽에는 2쌍의 유두가 관찰되었다.