2상 HB형 Linear Stepping Motor의 정지정도 개선에 관한 연구

정의남,임윤희,이상교,이경호,송우창 三陟大學校 1999 論文集 Vol.32 No.1

A Linear Stepping Motor (LSM) can operate in an open loop control mode similarly to a rotary stepping motor. However, the LSM occur error between the actual mover position and the ideal position. In this paper, a position accuracy improvement method using an energy stored in winding inductance of the LPM is proposed.

통풍 환자에서의 지질대사

이은우,강기서,강수용,이한준,김경환,임정일,박철경 중앙대학교 의과대학 의과학연구소 2001 中央醫大誌 Vol.26 No.2

Objective: To evaluate hyperlipidemia, a msjor tisk factor of coronary artery disease, frequently asscoiated with gout patients, we compared the mean lipid level of gout patient with that of non-gout male and accessed statistical significance for treatment of gout patient. Method: This study ws performed in the 266 male gout outpatients of the CAU medical center, who had serum lipid level test from Apr. 1996 to Aug. 2000. Serum uric acid, total cholesterol, triglyceride, HDL -cholesterol, and LDL-cholesterol level were measured after 12 hours of fasting. The patients with high lipid level were further evaluated into each type of the hyperlipidemia through electrophoresis study, and the test results were compared with that of the non-gout male adults(40∼60yr), and the statistical significance was examined. Results : The gout patients showed high levels of total cholesterol, triglyceride, and LDL-cholesterol. Especially they showed high level of triglyceride and LDL-cholesterol which suggested as the risk factors of atherosclerosis and coronary heart disease, but shoewed low level of HDL -cholesterol. But there were no definite relations between lipid level and other factors auch as age of patient, initial uric acid ;eve; and duration od gout. Conclusion: To evaluate the risk factors of atherosclerotic change of cadriac vascular system in gout patient, screening tests of serum lipid level of the patient seem mandatory.

경북 최초의 신장이식 1례

이중현,김용섭,이정호,이창우,김상욱,이문섭,오민구,하달봉,이경섭 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

신장이식은 환자의 삶의 질을 높이고 거의 정상적인 사회생활을 가능하게 함으로써 말기신부전 환자의 3가지 신대체 요법(혈액투석, 복막투석, 신장이식) 중에 가장 효과적이고 각광받는 치료법이라 할 수 있다. 최근 들어 의료기술과 의학의 발달로 신장이식의 성공률은 과거에 비해 비약적으로 높아지고 있으며 국내에서도 점차 신장이식수술을 받는 환자가 증가하고 있으나 서울이나 다른 대도시에 비해 의료환경이 열악한 중소도시나 지방의 병원에서는 아직도 시행하지 못하고 있는 형편이다. 이에 저자들은 경북 최초로 자체 의료진에 의해 고혈압과 말기 신부전으로 동국대 포항병원에서 혈액투석을 받고 있던 32세의 남자환자에게 부인으로부터 신장을 제공받아 신장이식을 성공적으로 시행하였기에 문헌고찰과 함께 보고하고자 한다. Kidney transplantation is the preferred treatment modality for many patients with end-stage renal disease (ESRD), because it offers improved quality of life over both hemodialysis and peritoneal dialysis. Patients who do well after transplantation generally report improvement in vitality and freedom to return to the style of life that they experienced before their progression to ESRD. Recently, the success rate of kidney transplantation is greatly being increased as the surgical technique and immunosuppressive drugs are developed. Kidney transplantation is also popular in Korea which has good result. But, until now the general hospitals which are located at small city can't try the kidney transplantation because they don't have proper facilities and experts. We firstly experienced a case of kidney transplantation in a 32 years old man with hypertension and chronic renal failure at KyoungBuk province. So we report this case with references.

특징 거리와 방향성을 이용한 필기체 수식 인식

강경완,이우선,정성환 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

We propose the recognition method of hand written numerical formula using the feature distance and the directionality. The proposed method uses the real time concept that is characteristic of on-line hand written character recognition. First, it receives the pixel coordinates of a numerical formula from a tablet. Secondly, it achieves the separation process on the inputed formula. Thirdly, it supplies sequentially one completed mathematical formula unconcerned with notes order. Finally, using the pattern conformity of feature distance and directionality, we recognize a completed mathematical formula. In the experiment using 100 mathematical formulas, the proposed method showed the recognition rate of about 98%

Gas Chromatographic Profiling을 이용한 n-Decane으로부터 Sebacic Acid를 생산하는 Candida tropicalis 변이주의 탐색연구

金京禮,金正漢,李華雨,李尙駿 성균관대학교 약학연구소 1990 成均藥硏論文集 Vol.2 No.1

Abstracts-The cells of Candida tropicalis KCCM 32008 were irradiated by UV lamp for 1 hour. After treatment with UV, mutants were isolated. In order to identify dicaboxylic acids produced in the culture medium of isolated mutants, acids were isolated from other organic compounds by solid-phase extraction method. This method made it possible to process many samples from small amounts of culture media with rapidity. Isolated acids were converted to tert. -butyldimethylsilyl derivatives, followed by gas chromatographic analysis. Dicarboxylic acids produced by Candida tropicalis were identified rapidly by computer searching of the retention index library of organic acids. Three mutants, which produce sebacic acid of high purity, were selected among eleven mutants.

17β-Estradiol의 심근 보호작용에 대한 연구 ; 재관류 부정맥을 유발한 동물실험

홍정석,김원,조규종,이미우,장성은,임경수 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: Although reperfusion certainly prevents tissue ischemia from possible cardiac death, several lines of evidence suggest that reperfusion may paradoxically aggravate the frequency of serious reperfusion-induced lethal arrhythmias. It has been reported that acute administration of estrogen at physiological concentrations reduced with myocardial ischemic injury in women with coronary heart disease. In studies with canines, acute administration by either the intra-muscular or the intra-coronary route similarly prevented ischemia and reperfusion dysrhythmias and also reduced the infarct size because the estrogen increased the distal coronary perfusion pressure, scavenged free radicals and had other effects during both ischemia and reperfusion. However, the canine heart is notoriously well collateralized. 17β-estradiol induces very little vasorelaxation in cat coronary rings, suggesting that increased ischemic myocardial blood flow dose not contribute to the protective effect. In the present study, employing a cat model of regional cardiac ischemia, we examined whether reperfusion rendered after acute administration of 17β-estradiol could lower the incidence of reperfusion-induced lethal arrhythmia and the death rate. Method: Adult mongrel male cats(n=31, 2.7∼4.5 kg) were anesthetized under positive-pressure artificial ventilation with room air. Electrocardiograms were recorded. The animals of the control group(n=15) were subjected to 20-minute left anterior descending coronary artery(LAD) occlusion followed by abrupt reperfusion. The animals in the experimental 17β-estradiol(2 or 20 ㎍/kg) group were subjected to ischemia/reperfusion insult following drug treatment: 17 β -estradiol was applied intravenously within the 60 seconds just before LAD ligation followed by abrupt reperfusion. The Fisher's exact test was used to compare the data from different animal groups(p<0.05). Results: The number of arrhythmias(ventricular premature beat, ventricular tachycardia and ventricular fibrillation) emerging during the reperfusion phase were not statistically different from that in the control group. The death rate in the 17β-estradiol 20㎍/kg group was lower from that in the control group(P value = 0.039). Conclusion: Acute administration of 17β -estradiol at a supraphysiological concentration might produce cardioprotective effects, not by modificating the coronary blood flow into the threatened myocardial region, but by other mechanisms that directly or indirectly increase the intrinsic myocardial ischemic tolerance in the cat during the reperfusion phase.

다이아프램 맨홀현상에 따른 응력 분배 거동

김경남,정경섭,권소진,우상익 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.1

Using of steel box girder bridges have been used a tendency to increase for workability and economic reasons. For maintenance and management of these bridges, manholes are needed for route. (But installation of manholes causes a loss of area of section. It is developed with stiffness down and stress concentration.) By way of prevention, it is reinforced with attachments and stiffeners or its shape strengthened by as aspect in geometry. Sometimes it is over-estimated and excessive reinforcing at a welding cost follows. In this paper, both experimental and analytical results are performed to verify the behavior of a steel box girder bridge under increasing dead loads. Furthermore, there is some structural analysis on several manhole types of diaphragm, which reflect the real effect of the support. The presentation in this paper is ultimately the most reasonable and economical reinforcing method for the manhole of a diaphragm is a steel box girder bridge.

탈지대두박에서의 Isoflavone의 분리를 위한 흡착제의 조건

여경은,조성빈,김우정 한국산업식품공학회 2003 산업 식품공학 Vol.7 No.4

탈지대두박을 이용한 isoflavone의 분리 및 정제를 위한 최적 조건을 찾고자 absorption resin인 Amberlite XAD-1180를 사용하여 흡착제의 활성화용매의 농도, 흡착된 isoflavone의 용출용매의 농도, 용출용매의 양과 용출속도, 시료와 흡착제의 비율 그리고 수지에 미치는 pH와 ion의 영향을 조사하였다. 수지의 활성화와 용출에는 Amberlite XAD-1180의 경우 methanol 75%로 활성화시키기 ethanol 80%로 용출시키는 경우가 가장 높은 값을 보였으며, 이때 사용하는 absorption resin은 isoflavone 흡착을 위해 사용한 단백질제거 탈지대두박용액양의 약 0.5배로, ethatnol의 양은 단백질제거 탈지대두박용액 양의 4배를 사용하여 flow rate 12mL/min의 경우가 적절한 조건임이 밝혀져 흡착제 사용이 isoflavone 함량을 최고 2~3배까지 향상시키는 결과를 보였다. 이때 분리된 isoflavone의 순도는 최고 40%까지 얻을 수 있었다. pH와 ion의 영향에서는 pH는 5.0,NaCl은 0.25N 이하에서 isoflavone의 유출량이 높았다. Conditions for sorption and elution of isoflavone with using amberlite XAD-1180 were studied to separate Isoflavone from defatted soybean flour (DSF). Isoflavone analyzed were daidzin, genistin, glycitin, daidzein, genistein and glycitein by HPLC. The result showed that washing Amberlite XAD-1180 with 75% methanol and then elution of isoflavone with 80% ethanol resulted the highest amounts of isoflavone recovered from the absorption resin. The most proper eluent factor was 4(eluent/sample volume), the sample factor was about 2(the volum of sample/the weight of resin) ad flow rate 12 mL/min. The pH 5.0 and less than 0.25 N NaCl were found to be proper for seperation of isoflavone. The isoflavone contents after seperation with absorption resin were about 40% in dry weight basis.

정전 열 접합을 이용한 Multi-Substrate Bonding

이덕중,주병권,최우범,한정인,조경익,이광배,장진,오명환 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

We performed silicon-to-glass bonding using silicon direct bonding followed by anodic bonding(SDAB). Initial bonding between glass and silicon was caused by the hydrophilic surfaces of silicon and glass ensemble using silicon direct bonding(SDB) method. We found that the bonded specimen using SDAB process had higher strength than one using anodic bonding process only. We performed multiple layer bonding by SDAB, which is glass- silicon -glass as sandwich structure. In the silicon wafer, the (1mm x 2mm x 500μm)-sized cavity was formed by the anisotropic etching of the silicon substrate in EPW(Ethylendiamin-Pyrocatechol-Water). And, the cavity was sealed with glass wafers by SDAB method.

용융슬래그로부터 합성된 제올라이트 이용한 해수 중의 N, P 제거

임준혁,정진영,이성우,홍성호,김경희,이제근 한국공업화학회 2003 응용화학 Vol.7 No.1

This study examined, as the one way of using zeolite, the about the removal of ammonia nitrogen and phosphorus that cause the eutrophication occurred the adjoining seas.4A type zeolite was used as an adsorbent to remve NH_4-N, PO_4^3-P ion in the artificial seawater. Zeolite is more required than in the fiesh water, under the same conditions, in order to remove NH_4-N in the sea water. The lower the thickness of NH_4-N is in the early stage, the more Freundlich type equation the value of 1./n increases. In case of PO_4^3-P indicated that the removal efficiency was relatively independent of PO_4^3-P concentration. Freundlich parameter 1/n has the value nuder 2. So it shows that absorption is made with relatively ease.