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한국인 여성의 자궁경부암에서 PCR을 이용한 Human papillomavirus 아형의 검출에 관한 연구
김향우,전호종,김윤신,장원재,이미숙,이미자 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2
The polymerase chain reaction (PCR) was used for detection of human papillomavirus (HPV) in paraffin-embedded tissue. Tissues stored as paraffin blocks were a potential source of DNA for retrospective clinicogenetic analysis. Sections in 6 ㎛ (three or five) thick cut from paraffin blocks of 29 uterine cervix dysplasia, 34 uterine cervix carcinoma in situ, 42 uterine cervix squamous cell carcinoma and 10 uterine cervix metaplasia samples were deparaffinized and incubated at 37℃ for 48hrs. in the lysis solution. Following organic extraction and alcohol precipitation, and extracted DNAs were identified by gel electrophoresis. These DNAs carried out PCR. After repeated cycles of specific oligonucleotideprimed extension of viral DNA with thermophilic DNA polymerase. the type of HPV present was then determined on the basis of the size of the ethidium-bromide stained band visible after agarose gel electrophoresis : for HPV 6 is 263 bp. for HPV 11 is 144 bp, for HPV 16 is 601 bp. and for HPV 18 is 360 bp. This study detected HPV DNA in four cases. which broke down to HPV 16 in two case of uterine cervix carcinoma in situ and two case of uterine cervix squamous cell carcinoma, no HPV type in the remainder. Histologically, HPV types 6, 11 are mainly detected in benign genital warts and lowgrade cervical dysplasias, squamous cell carcinoma frequently contained HPV 16, whereas, HPV 18 was present in adenocarcinoma, adenosquamous cell carcinoma and small cell carcinoma of the cervix. These results indicate that cervical cancers might be clinically influenced by the differences in sutible of the infecting HPV.
스케일링 및 데이터 보존을 위한 2단자 사이리스터 랜덤 액세스 메모리 (T-RAM) 특성 분석
김향우(Hyangwoo Kim),조현수(Hyeonsu Cho),최민근(Minkeun Choi),공병돈(Byoung Don Kong),백창기(Chang-Ki Baek) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
2 terminal thyristor random-access memory (T-RAM) is investigated in terms of doping concentrations in the storage region to improve scalability and data retention time. When doping concentrations of N and P storage region are equal to each other at 1018 cm-3, T-RAM exhibits the highest retention time of 100 msec. In addition, it is proposed how to set the standby voltage in an energy-effective way. This standby voltage allows steady data retention of T-RAM with femto-scale leakage current until the erase operation is applied. Consequently, the proposed guideline can give a pathway to realize 2 terminal T-RAM as a promising capacitor-less DRAM technology.
유한요소법을 이용한 승용차 steering column의 3-piece 용접부에 대한 열응력해석
김향우,김옥삼 麗水水産大學校 産業技術硏究所 1996 産業基術硏究所 論文集 Vol.5 No.-
Welding of 3-piece is a important technological method in mechanical engineering. Co₂/MAG(Metal Active Gas) welding means that matal part in steering column of passenger car are joined by melting(with or without a filler material) or that new material is added to a matal part by melting. The welding thermal stresses appear due to a non-uniform temperature field. inhomogeneous material properties, external restraint and volume changes during phase trnsformations. The analysis of thermal stresses may also be possible to avoid some large expensive expriments or experimental parametric studies which can often be made less expensively by numerical simulation. The thermal and mechnical properties of material very with temperature, so that the temperature dependence of material properties must be taken into consideration in the thermal stress analysis of these elements. In this study analysis the thermal stresses distribution of 3-piece welding area in steering column for passenger car using finite element method(FEM). Therefore it calculates the numerical value that can be applied to the optimun design of welding parts and the shapes. The significant results obtained in this study are summerized as follows. At early stage of the cooling, the abrupt thermal stresses gradient has been shown in vicinity of the bottom face of welding area. In the thermal stresses analysis due to temperature gradient and heat shocking maxinum stress was occurred in the top part of welding zone and stresses were distributied from 1950 MPa to -1900 MPa.
고신뢰성 데이터 유지 특성을 가진 3단자 사이리스터 랜덤 액세스 메모리
김향우(Hyangwoo Kim),조현수(Hyeonsu Cho),서명해(Myunghae Seo),이승호(Seungho Lee),공병돈(Byoung Don Kong),백창기(Chang-Ki Baek) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
Three-terminal thyristor random access memory(TRAM) is investigated in terms of gate-cathode voltage(VGC,ST) and anode-cathode voltage(VAC,ST) in the standby state to improve the retention characteristics and low-power operation. The device with the optimized VGC,ST of -0.4 V and VAC,ST of 0.55 V shows the continuous retention capability without refresh operation with a low standby current of 0.13 pA. In addition, the proposed array operation scheme can effectively minimize operation disturbances on unselected cells. Consequently, the three-terminal TRAM with the proposed array operation provides excellent retention and high-reliable memory configurations comparable with or surpass DRAM.
피부 미용에 있어서 자외선 차단제의 개발 및 유효 안전성
김상춘,남기대,이향우 ( S . C . Kim,K . D . Nam,H . W . Lee ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.2
The ultraviolet blocking agents used to skineare are largely classified ultraviolet scattering agent and ultraviolet absorbent agents. There are UVC, UVB, and UBA in ultraviolet ray(UV) showing shorter wavelength than visible light. Both visible light and UVA give rise to 1st dark-skinned phenomena. On exposure of the skin to UV, phenomena of skin variation are termed sunburn or suntan. There are chronic and acute adverse reactions in skin response to UV. The latter is caused by UVB, which has mainly effects on the skin. But lately due to destruction of ozone layer, UVA has more serious irritation on the skin than UVB. In this paper spectrometric properties of UV absorbent agents such as PABA, octyl-PABA, Urocanic acid, and 2-hydroxy-4-methoxy benzophenone in vitro have been investigate. As results, it was found that the three fomer were more suitable than the last. UV scattering measurements on the sample used inorganic pigments showed that pigments containing titanium dioxide had a better scattering effects than the inorganic pigments such as Fe_2O_3, Al_2O_3, etc.
과채류 및 식기류에 있어서 합성세제와 계면활성 성분의 잔류성과 안전성에 관한 연구
김형식,남석우,이향우,홍사욱 한국환경독성학회 1994 환경독성보건학회지 Vol.9 No.2
Synthetic detergents and commercial surfactants have been widely used as household and industrial detergents. The purposes of this study was to investigated the residual amounts and its safety of synthetic and commercial surfactants on the surfaces of fruits, vagetables and tablewares. The tested solutions were four kinds of raw materials of detergents such as LAS (Linear alkyl benzene sulfonate), AOS (α-Oleffine sulfonate), SLS (Sodium lauryl sulfonate) and SLES (Sodium lauryl ester sulfonate) and two kinds of commercial surfactants for kitchen. Cabbage and grapes were dipped in the each solution of the synthetic or commercial surfactants and washed 5 times in static or flow state. For the other experiments, stainless bowl was dipped in the each solution and washed also 5 times with cold and hot water in static or flow state. The residual amounts of the detergents were measured and also safety assessment was determined. The results of this study were summarized as follows. 1. The residual amounts of the detergents on the tested cabbage and grapes after 5 times washing were detected with the range from 0.105 to 3.009ppm in static state and from 0.104 to 2.963ppm in flow state. 2. The residual amounts of the detergents on the tested stainless bowl after 5 times washing were detected with the range from 0.012 to 1.243ppm in static state and from 0.014 to 1.4232ppm in flow state. 3. The safety ratio has been used as an evaluation of human health effects on the exposure of synthetic and commercial detergents. In this study, the estimated safety ratio was 2,459 and it is higher than recommended safety ratio on the food additives in WHO.
랫트에 있어서 DWH-01 (Ranitidine:Bismuth subcitrate:Sucralfate) 의 급성독성에 관한 연구
김용기,이향우,김형식,유영효,이병무,이제원,변수현,박선미 한국응용약물학회 1993 Biomolecules & Therapeutics(구 응용약물학회지) Vol.1 No.2
Acute toxicities of DWH-O1 (Ranitidine : Bismuth : Sucralfate=1.5 : 2 : 6) were investigated in Sprague-Dawley rats. Seven days after oral administration of DWH-O1 with different doses (10 g/kg, 5 g/kg, 2.5 g/kg, 1.25 g/kg, 0.625 g/kg), we examined numbers of deaths, general signs, weight measurement and histopathological examination for both sexes of rats. Summaried results are: 1) No deaths were occurred, 2) There were no pathological and clinical differences compared with control group, 3) No significant changes of body weights were observed, and 4) In histopathological examinations of organs and tissues, there was some hemorrhage in a lung tissue of low dose group for male and female respectively, but it was thought to be caused by environmental factor. The results suggest that toxicity of DWH-Ol is low and its LD_(50), is over 10 g/kg in Sprague-Dawley rats.