E. coli에 의한 1세 미만 요로 감염의 치료에 방광요관역류가 미치는 영향

김형대,이상윤,이균우,정현기 고신대학교의과대학 2006 고신대학교 의과대학 학술지 Vol.21 No.2

Background : Vesicoureteral reflux(VUR) is the major cause of urinary tract infection(UTI) in children. The study was done to confirm the influence of vesicoureteral reflux on treatment of urinary tract infection. Methods : One hundred seventy one patients below 1 year old diagnosed with UTI by Escherichia. coli (E. coli) in the Department of Pediatrics, Dae-Dong Hospital from January, 2001 to December, 2005 were retrospectively enrolled to analyze relevant information obtained from medical record, including hematologic and urine analysis, renal ultrasonography, 99mTc-DMSA renal scan, antimicrobial susceptibilities and response of treatment, comparing two group of absence and presence of VUR. Results: Leukocytosis and decreased Hemoglobin level was predominent and the rate of bacteriuria and nitrite positivity were 84.1% and 40.4% respectively. Renal ultrasonography didn't contribute to the prognostication of VUR. Presentation of photopenic area in 99mTc-DMSA renal scan was related to VUR and the severity of VUR was significantly correlated with renal scar formation(P<0.05). Average count of administrated intravenous cefotaxime for treatment of UTI was 2.4 times until afebril state, 9.6 times until loss of pyuria and 2.2 times until no growth of Escherichia. coli in urine. Conclusion : There was no differentiations in WBC count, Hb level, urine analysis and response of treatment estimated by count of administrated intravenous cefotaxime until afebrile state, loss of pyuria and no growth of E. coli in urine between the group of absence and presence of VUR.

Hg^2+에 의한 토마토 뿌리조직 마이크로솜 H^+-ATPase의 가역적 저해

신대섭,조광현,김영기 충북대학교 첨단원예기술개발연구센터 1999 연구보고서 Vol.4 No.-

토마토 뿌리조직의 마이크로솜 ATPase 활성에 대한 중금속의 효과를 조사하기 위하여 뿌리조직으로부터 마이크로솜을 분리하였고, enzyme-coupled assay를 이용하여 마이크로솜 이온펌프(ATPase)의 활성을 측정하였다. 여러 가지 중금속 이온들 중 Hg2+은 마이크로솜 ATPase 활성을 농도 의존적으로 저해하였으며, Gd3+ 과 Fe3+, La3+, Zn2+ 그리고 Pb2+ 등은 마이크로솜 ATPase의 활성을 현저히 저해하면서 동시에 assay에 사용된 효소를 저해하였다. 그러나, CS+과 BA2+은 마이크로솜 ATPase 활성에 영향을 미치지 않았다. Hg2+은 원형질막과 액포막에 위치하는 H+-ATPase들의 활성을 10 μM 이상의 농도에서 급격히 저해하였고, 1 mM 이상의 농도에서 완전히 저해하였으며, 두 효소들에 대한 활성저해의 Ki 값은 각각 80 , μM, 58 μM로 나타났다. Hg2+에 의해 저해된 ATPase의 활성은 DTT의 농도를 증가시킴에 따라 회복되어, HG2+에 의한 ATPase 활성저해는 가역적임을 확인하였다. 이러한 결과들은 Hg2+이 원형질막과 액포막에 위치한 H+-ATPase들을 비선택적이고 가역적으로 저해함을 보여준다. In order to characterize the effects of heavy metal ions on the microsomal ATPase activities, microsomes were prepared from the roots of tomato plant and the activity of microsomal ATPase was measured by an enzyme-coupled assay. Hg2+ inhibited the activity of microsomal ATPase in a dose-dependent manner, while Gd3+, Fe3+, La3+, Zn2+, and Pb2+ inhibited not only the ATPase activity but also the activities of enzymes used in the assay. However, Cs+ and Ba2+ showed no significant effect. Hg2+ inhibited the activities of both plasma membrane and vacuolar membrane H+-ATPases. In the dose-response to Hg2+, the activities of both microsomal H+-ATPases were severely inhibited at the concentration of Hg2+ above 10μM and were completely inhibited at 1 mM Hg2+. Apparent Ki values of Hg2+ on the inhibitions of plasma membrane and vacuolar membrane H+-ATPases were 80 μM and 58 μM, respectively. The Hg2+-induced inhibitions were reversible since the addition of dithiothreitol completely reversed the inhibitory effects of Hg2+.These results suggest that the inhibitory effects of Hg2+ on both plasma membrane and vacuolar membrane H+-ATPases are nonselective and reversible.

多目的 計劃法에 의한 合成PC橋의 最適化

金基大,朴聖圭,林鍾國 大邱大學校 科學技術硏究所 1999 科學技術硏究 Vol.6 No.2

This paper is to propose optimum Design with the multiobjective function for the composite PCI girder algorithm by the SLP method, which is able to get a optimum solution easily by the use of the linear programming method in order to design a practical composite PCI girder bridges. To verify, the reliability of results, this method was applied to the composite PCI girder bridge which is being used in fields now. As a result, the algorithm of this paper was revealed easy and practical to get the PCI girder space, the optimum prestress, and the eccentric space.

Wilson θ 법에 의한 橋梁의 動的應答 解析

김기대,홍병희,박성규 大邱大學校 科學技術硏究所 2000 科學技術硏究 Vol.7 No.1

This study presents the use of transfer matrix method to determine the natural frequencies of bridges, and the application of Wilson B method to the analysis of dynamic response of the bridges caused by moving loads. To check the reliability of the theory introduced and the computer program developed, the dynamic responses of single-span and multi-span bridges subjected to moving vehicle loads with constant velocity were studied. The results obtained were compared with the field test results of existing information. It was found that good agreement was achieved, and the conclusions obtained from the observations of analysis inform that can use as rational approach to the dynamic analysis for these problems.

Al-Zn-Mg合金의 加工熱處理에 미치는 遷移元素의 影響

趙顯驥,李基大,金熙都 慶北大學校 1982 論文集 Vol.33 No.-

An investigation for influence of a small additions of transition metals (Mn, Zr, Cr) on the thermomechanical treatment (TMT) in Al-Zn-Mg alloys has been carried out by means of the measurements of tensile strength and micro-vickers hardness. The results obtained from this experiment are summarized as follows; 1) Hardness and strength of Al-Zn-Mg alloys are increased remarkable by a small additions of transition metals (Mn, Zr, Cr) at as-quenched state. 2) Influence of a small additions of transition metals like Mn, Zr and Cr added to Al-Zn-Mg alloys on ageing phenomena was retarding the ageing character. 3) The mechanical properties (hardness and strength) of Al-Zn-Mg alloys which were processed by TMT are increased when the deformation rate is lower than 30%, on the other hand those of Al-Zn-Mg alloys added transition metals were decreased with increasing deformation rate.

釜山大學校 학생 써클활동 實態와 그 運營改善方案에 관한 調査硏究

李衡基,李成海,李大雨,鄭榮洪,林再澤 부산대학교 학생생활연구소 1983 硏究報 Vol.19 No.1

The present study deals with student circle activities at Pusan National University in an effort to improve student circle guidance. University circles are regarded as influencing an individual's self-growth. Two sources of data were used for this research. A total of 764 students at Pusan National University who were randomly sampled out of the registered students in 1982 Spring semester were the main subjects. Another source for the study were from 70 student circle leaders whose responses to another questionaire in a special leader training session held on October of 1982. Student respondents for this study were analyzed in three groups;(1) students who participate in circle activities at the time of the research, (2) students who participated in a circle in the past but not active at the time of the questionaire interview, (2) students who have never been members of a circle. The student respondents who were or have been members of the circles in which they participate:social service circles;academic circles; circles for special hobbies; religious circles; athletic circles for special hobbies; anti-communism circles. Some of the important findings from this research are summarized in the following. (1) Pusan National University students enjoy more student circle activities as demonstrated in the sheer number of student circle activities registered in the Student Affairs Section of the University. Circles with friendship purpose seem to decline, while circles for special hobbies and academic purposes tend to increase. (2) Many students were found to drop out of the circle activity mainly due to the lack of the circle activity information before their participation in those circle. More coeds than male students show this tendency. (3) Student circle members with specific purpose and goal in mind before participating in those circle regard aircle activity as contributing to the self-growth. (4) Many respondents think that circle activities are vital and necessary in the campus life. However, they do not find proper circle to paticipate. (5) The role of the student circle guidance professors was found to be important. (6) Problems for funding the student circles and finding meeting places for the circle activity remain to be solved. In short, the present study underlines the importance of the activization student activities which can be achieved through intensive circle guidance by circle advice professor and proper funding.

低濃度 Al-Si系合金에 있어서의 Si 析出物의 粗大化 現象

趙顯麒,李基大,崔德淳 慶北大學校 1981 論文集 Vol.31 No.-

The coarsening behaviours of Si precipitates in dilute Al-Si alloys havs been investigated by means of scanning electron microscopy and also determined the number density of Si precipitates and activation energy for the growth of precipitates. The mean radius of Si precipitates in dilute Al-Si alloys was proportional to (time)^(1/3) and this results agree with Lifshitz-Wagner theory for the diffusion controlled mechanism. The number density of Si precipitates was decreased monotonously with increasing of ageing time. Activation energies for the coarsening of Si precipitates in Al-0.8wt% Si alloy and Al-1.2wt%Si alloy were 33.44 Kcal/mol and 32.9 Kcal/mol respectively, which agreed with that of inter-diffusion.

직교성 다항식을 이용한 평판의 진동 해석

韓秉基,韓大湜,鄭 剛 弘益大學校 1988 弘大論叢 Vol.20 No.2

In this study, by using the polynomials by Gram-Schmidt process of several orthogonal polynomials as characteristic function, the defects of general orthogonal functions, for example, beam functions induced the complex analysis and orthogonal polynomials applied to limited boundary conditions, and so on, were overcome. Especially, as consequence of compare with the results by general beam functions and orthogonal polynomials, the results of this paper accord very well with those results. Thus, this paper the application possibility of very useful, new characteristic function, and the basic data in dynamic problems were repared for all possible boundary coditions of plates.

양자교환 방식에 의한 방향성 결합기의 제작 및 특성연구

소대화,채기병,강기성,윤형도 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-

In this study, a directional coupler which is fabricated on X-cut LiNbO₃ substrate by using proton exchange method is described. It is found that the directional coupler waveguide varied widely with controlling diffusion process. On the other hand, the on-off state of modulator is performed by annealing process and self-aligned electrodes are used in fabricating the direction coupler. As a results, the direction coupler has good characteristics : the measured on-off switching voltage of about 2.7-3V.

Y-Ba-Cu-O계 초전도 박막 제작 및 특성 연구

채기병,소대화,강기성 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

The superconducting thin films have ben deposited on the SiOx substrate by R.F magnetron sputtering using YBa₂Cu₃Ox single target. The thickness of films was 1000-2000Å with a rate of 20-25Å/min and superconducting properties were studied of thin films depend on the compositions. We have studied the superconducting thin films obtained under the various conditions in this sputtering method of fabrication and aiso analyzed SEM photograph and X-ray diffraction patterns of calcination powder to target and the thin films have an influence in addition. We could measure the annealing condition and the electric properties of superconducting thin films owing to substrate about 50K.