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다축응력상태에서의 304 스테인리스강의 고온 파괴수명에 관한 연구
김호경,정강,정진성,Kim, Ho-Kyung,Chung, Kang,Chung, Chin-Sung 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
Specimens of 304 stainless steel were tested to failure at elevated temperatures under multiaxial stress states, uniaxial tension using smooth bar specimens, biaxial shearing using double shear bar specimens, and triaxial tension using notched bar specimens. Rupture times are compared for uniaxial, biaxial, and triaxial stress states with respect to the maximum principal stress, the von Mises effective stress, and the principal facet stress. The results indicate that the principal facet stress gives the best correlation for the material investigated, and this parameter can predict creep life data under multiaxial stress states with rupture data obtained with specimens under uniaxial stresses. The results also suggest that grain boundary cavitation, coupled with localized deformation processes such as grain boudary sliding, controls the lifetimes of the specimens.
김호경,천진미,이아영,이혜원,최지현,장설,고병섭,Kim, Ho-Kyoung,Chun, Jin-Mi,Lee, A-Young,Lee, Hye-Won,Choi, Ji-Hyun,Jang, Seol,Ko, Byoung-Seob 한국한의학연구원 2005 한국한의학연구원논문집 Vol.11 No.2
This study was investigated to determine the quality control of Oriental medicine from stores dealing in Oriental medicine around Seoul and Daegu. We tested total 120 samples that widely used 15 species in herbal medicine (Lycii Fructus, Platycodi Radix, Angelicae Gigantis Radix and 12 others) being collected from Oriental medicine clinic, pharmacy, Oriental pharmacy, Oriental medical hospital and Oriental drug store. We have estimated Oriental medicine by K.P. (Korean Pharmacopoeia), K.H.P(Korean Herbal Pharmacopoeia) and announcement of KFDA. The items of examination were identification, purity, loss on drying, ash, acid insoluble ash, extract content, essential oil content, assay, heavy metal limit, and pesticides residue(BHC, DDT, Aldrin, Endrin, Dieldrin). As a result, 20 samples in total 120 samples were not satisfied with the standard and 7 species in total 15 species were not satisfied with the standard. Identification test, extract content test and pesticides residue(BHC, DDT, Aldrin, Endrin, Dieldrin) were satisfied with the standard. The result will be the basic data for the quality control of Oriental medicine.
유자의 항 Influenza 바이러스 A형 활성에 관한 연구
김호경,고병섭,전원경,Kim, Ho-Kyoung,Ko, Byoung-Seob,Jeon, Won-Kyung 한국생약학회 2000 생약학회지 Vol.31 No.1
To evaluate anti-influenza virus activity of 113 specimens of Korean traditional medicine both water and methanol extracts were examined using haemagglutination inhibition test. The water extract from Citrus junos was found to inhibit influenza virus A/Taiwan/l/86(H1N1). The survival rates of virus were determined by in situ cellular enzyme-linked immunosorbent assay. The water extract of Citrus junos was fractionated by chromatographic separating using Amberlite XAD-4, 40% MeOH and 60% MeOH layer had antiviral activity. The half inhibition concentration $(IC_{50})$ of 40% MeOH layer on survival of influenza virus was $MIC>361.5{\mu}g/ml$ and $IC_{50}$ value of fr. 40-4 fractionated from 40% MeOH layer was $677.19{\mu}g/ml$. These results suggested that the fractions of Citus junos have potent anti-influenza A virus activity.
김호경,서정인,Kim, Ho Kyung,Suh, Jeong In 대한토목학회 1994 대한토목학회논문집 Vol.14 No.6
앵커리지 (Anchorage)가 주케이블을 지지하는 전형적인 현수교에서는 행거를 가설한 후에 보강형을 순차적으로 가설하기 때문에 시공시 행거에 별도의 긴장력이 필요없다. 이와는 달리 자정식 현수교는 가교각으로 보강형을 지지한 후 행거를 설치하게 된다. 따라서 행거 가설시 초기 긴장력을 가할 필요가 있으며 이 후 계속되는 시공과정에 의해 장력이 지속적으로 변화하게 된다. 따라서 행거의 가설방법을 변화시켜가며 이에 따른 행거장력의 변화 양상을 파악하여 가장 효율적으로 행거를 가설할 수 있는 방법을 결정할 필요가 있다. 이를 위하여 본 연구에서는 해석적인 방법을 제시하였다. 현수교 시공의 진행에 따라 단계적으로 변화하는 구조계를 모사할 수 있는 사공단계해석 알고리즘을 제시하였다. 또한 자정식 현수교에서 발생할 수 있는 기하비선형 해석모델을 제시하였다. 실물 교량을 대상으로 제시된 해석방법에 따라 가장 효과적이라고 생각되는 시공방법을 제시하였다. Because the stiffening girders are constructed after the installation of hangers for typical suspension bridge, no additional tensioning to hangers in construction is necessary for this bridge type in which main cable is earth-anchored. However, for self-anchored suspension bridge, hangers are installed after temporarily supporting stiffening girders constructed in previous stage. Therefore, initial tension is required on installing hangers. Tension of hangers varies as the construction proceeds. Hence, it is necessary to determine the most efficient method of installing hangers among several methods. This study presents finite element procedures and the algorithms of construction stage analysis to simulate construction processes. Geometric nonlinear analysis scheme is also included. The most effective method regarding the installation of hangers is presented through the examples of actual bridge model.
$550^{\circ}C$에서의 2.25Cr-1Mo 강 용접부의 고온 균열성장 거동에 관한 연구
김호경,정강,정진성,Kim, Ho-Kyung,Chung, Kang,Chung, Chin-Sung 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.3
Both creep deformation and creep crack growth experiments have been conducted on 2.25Cr-1Mo steel weldment in order to provided an information on residual life prediction of structural component weldment containing a crack. The stress exponent of creep deformation equation for the base metal and weldment at 823k were found to be 10.2 and 7.3, respectively. These two values could be assumed that dislocation climb processes are controlling the creep deformation of both materials. The creep rate of the weldment was very low, compared with that of base metal under the same applied stress. Whereas the creep crack growth rate of the weldment was almost twice higher than that of base metal under the fixed value of $C^*$. This may indicate that the weldment is stronger than the base metal in view of creep deformation and is brittle during creep crack growth due to the intrinsic microstructure of banite and relatively higher and Mn contents.
A comparative electrical transport study on Cu/n-type InP Schottky diode measured at 300 and 100 K
김호경,Chan Yeong Jung,Se Hyun Kim,Yunae Cho,김동욱 한국물리학회 2016 Current Applied Physics Vol.16 No.1
Two oxygen plasma treated InP samples with different plasma powers of 100 and 250 W were prepared and a comparative study on the electrical properties of Cu/n-type InP Schottky diode measured at 300 and 100 K was performed to investigate the current transport mechanism in detail. The forward and reverse bias currentevoltage (IeV) characteristics were analyzed with considering various transport models. The fitting to the forward bias IeV characteristics revealed that relatively high ideality factor at 300 K for untreated sample were related with the generation-recombination (GR) current and the large E00 value at 100 K for 100 W plasma treated sample were associated with more significant tunneling effect. The analyses on the reverse bias current characteristics showed the suitable current transport model has changed from thermionic emission (TE) to TE combined with barrier lowering for both untreated and 250 W treated samples and from TE þ BL to thermionic field emission for 100 W treated sample with increasing temperature from 100 to 300 K.