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정태훈 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
In press forming of sheet metals, the material sheet is usually subjected to very large plastic strain under in-plane stressing. Moreover, the sheet also very often is subjected to out-of-plane compressive force between tools such as the upper and lower dies, the blank holder and the die, and so forth. In this paper, it is clearly demonstrated theoretically that out-of-plane stress may notably raise the forming limit strain and thus it can be effectively utilized to avoid earlier fracture of the sheet in press forming.
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大邱地方에서 分離한 Salmonella의 抗菌濟感受性(1978年)
丁泰勳 慶北大學校 1979 論文集 Vol.27 No.-
Three hundred strains of Salmonella consisted of 70 Salmonella paratyphi A and 230 S. typhi isolated in Taegu area during the period from January to December of 1978 were studied for their susceptibilities to antimicrobial drugs of routine use. All strains were susceptible to chloramphenicol, tetracycline, streptomycin, nalidixic acid, ampicillin, kanamycin, gentamicin, trimethoprim-sulfamethoxazole, amikacin, carbenicillin, and cephaloridine. S. paratyphi A showed the highest susceptibility to gentamicin, and S. typhi to ampicillin among the drugs tested. A majority of S. paratyphi A were weakly resistant to sulfisomidine and rifampicin, and most strains of S. typhi were only weakly resistant to rifampicin. Multiply drug-resistant and R plasmid-carrying strain was not found among Salmonella tested.
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정태훈,임진모,이덕래,Jeong, Tae-Hun,Im, Jin-Mo,Lee, Deok-Rae 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.12
This study were made on the air permeability of weft knitted fabrics using cotton yarn as raw materials. It is general assumption that the air permeability as weft knitted fabrics are resulted from the sum of two parts. The one is a nozzle part such as space among yarns in cotton knitted fabrics, and the other is a capillary part such as space among fibers in knitted yarn. Based on this assumption we had studied on the three basic weft knitted structures as plaint 1$\times$1 rib and interlock stitches in connection with air permeabilty. And we had made the regression equations between parameter A(nozzle part), B(capillary part) and air-permeability of cotton knitted fabrics by means of stepwise regression analysis. From the analysis, the f311owing results were obtained: Vupia, n) : 7.36639+203.03799A+371.05482B, Vunb)=26.27621+ 256.03855A+281.64791B, Vu, n‥‥1~k)= 56.51290+56.78075A+54.97715B, Vu, o, at)=28.807)6+214.90318A+71.51714B.
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정태훈,한대현,최영식 東義大學校産業技術開發硏究所 2003 産業技術硏究誌 Vol.17 No.-
본 논문에서는 IMT-2000 기지국(중계기)용 저잡음 증폭기에 적합한 저 전압, 저 전류 동작점을 설정하고 이와 동시에 낮은 잡음 특성과 높은 입력 인터셉트점을 가지는 증폭기를 설계하였다. 입력 부정합에 의한 높은 입력 IP_3를 얻기 위하여 50Ω에 가까운 최적의 잡음지수를 얻기 위한 반사계수 값이 아닌 0.3㏈ 이하의 일정 잡음지수원 상에서 보다 적절한 부정합을 얻을 수 있는 입력 반사계수를 설정하고 출력을 복소 정합회로로 설계하여 두 특성을 최대로 얻을 수 있게 하였다. 본 논문에서는 최근 통신소자로 각광받고 있는 HEMT소자를 사용하였으며 Agilent사의 pHEMT ATF-36077을 능동소자로 채택하고 Agilent사의 고주파 시뮬레이터인 ADS를 이용하여 회로 설계 및 모의실험, 회로 및 성능의 최적화를 수행 하였으며 모의실험 결과를 활용하여 유전율 ε_r=3.0, 두께 0.762㎜인 테프론(Teflon) 기판을 이용하여 제작하였다. 구현한 저잡음 증폭기는 정합 및 바이어스의 최적화를 수행하여 기지국(중계기)용으로 제작되었으며 V_(ds)=2[V], I_d=9[mA]의 동작특성과 낮은 잡음특성, 높은 입력 인터셉트점, 그리고 입/출력에서 양호한 정합 특성을 얻을 수 있었다.
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丁泰勳,鄭聖洙,李圭寶,黃基錫 慶北大學校 醫科大學 1978 慶北醫大誌 Vol.19 No.2
著者들은 1975年 5月부터 1977年 12月까지 慶北醫大附屬病院에 入院한 4例의 原發性骨髓機維症을 臨床血液學的으로 觀察한 바 다음과 같이 要約할 수 있었다. 1. 男女比는 同一하였으며 年齡은 10代에서 2例 30代에서 2例로서 比較的 젊은 年齡層에 屬하였다. 2. 主訴는 全身無力感, 鼻出血, 腹部腫瘤等이 었으며 첫 症狀이 發現한 후 診斷時까지의 期間은 1個月부터 4年사이였다. 3. 初診當時 全例에서 輕度부터 中等度으 肝腫(1∼4橫指), 輕度부터 高度의 脾中(1∼10橫指)이있었다. 骨髓穿剌는 모두 dry tap로 끝났으며 骨髓生檢에서 비로소 纖維症을 全例에서 證明할 수 있었다. 4. 全例에서 貧血이 있었으며 自由球數는 減少 도는 增加하였고 血小板數는 正常 또는 減少되었다. 全例에서 淚適狀赤血球를 볼 수 있었으며 3例에서 赤芽球 및 末熟白血球가 나타났다. 5. 全例에서 durabolin 및 myleran으로써 治療하였으나 多少 效果가 있었다. 6. 4 例中 2例에서는 確診후 1個月 및 4個月 후에 各各 死亡했으며 1例는 行方不明, 그리고 나머지 1例는 繼積加療中이다. The authors observed four patients with idiopathic myelofibrosis who had been admitted to Kyungpook National University Hospital between May 1975 and December 1977. the pertinent clinical results are as follows: 1) The male-to-female ratio was equal. Two patients were in the second decase and other two patients in the fourth decades. 2) The chief complaints were general weakness, epistaxis and adbominal masses. The intervals from the onset of the disease to the diagnosis were between one month and four years. 3) There were hepatomegaly(1-4f.b.) and also splenomegaly(1-10f.b.) in all patients at the time of their first visit to the Hospital. All marrow aspirations attempt resulted in dry tap and a diagnosis of myelofibrosis was proved only by menas of marrow biopsy in all patients. 4) anemia was seen in all patient on first admission. Leukopenia or leukocytosis and normal platelet count or thrombocytopenia were observed. Tear drop cells were noted uniformly in all patients. Normoblasts and immature leukocytes were seen on the peripheral blood in three patients. 5) All patients had been treated with durabolin and myleran with somewhat encouraging results. 6) Two out of four patents were expired within one month and four months respectively after a diagonsis was made. One patient was lost to follow-up and another patient is currently under treatment
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정태훈 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In this paper, Compression in the case where dissimilar blocks arc twinned variously are carried out in the condition of lubricated interface. The degree of growth is experimentally investigated. Moreover, numerical simulations are carried out by the elastic-plastic FEM for the case of the dissimilar blocks with the initial sawtooth angle of 60°. The dissimilar blocks are twinned, larger difference between material properties leads smaller growth, and the degreased interface leads smaller growth than that in the lubricated one. Furthermore, by the simulation of compression where dissimilar blocks are twinned, it is confirmed that the tendency of the general deformation pattern is very similar to the experiment.
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