미세혈관 협심증 환자의 임상상 및 지표에 관한 연구

박상호,온영근,김현정,이태훈,길효욱,김현건,박수진,송해정,한대희,방덕원,신원용,이내희,김성구,권영주 순천향의학연구소 2003 Journal of Soonchunhyang Medical Science Vol.9 No.1

Background : Microvascular angina or syndrom X is heterogenous and encompasses different pathogenetic entities. Several studies suggest that microvascular angina have good prognosis and occurs predominantly in postmenopausal women. Lipoprotein (a), total cholesterol, LDL-cholesterol, HDL-cholesterol, triglyceride, homocystein, CRP and fibrinogen are the independent risk factor of acute coronary syndrome and are the chief underlying cause of atherosclerosis. We investigated clinical characteristics and markers in patients with microvascular angina. Methods : We studies 23 patients diagnosed with microvascular angina and 16 control group with negative treadmill exercise test and no significant coronary angiogram. We investigated clinical characteristics in patients group and evaluated symptom during a follow-up period of 4.2± 2.5 month. Exercise time in treadmill exercise test was compared between patients and control group. We assessed the level of markers, such as lipoprotein (a), total cholesterol, LDL-cholesterol, HDL-cholesterol, triglyceride, homocystein, CRP and ESR in two groups. Results : There is no difference in age between two groups. Patients group had a tendency to increase in female, hypertension, DM, and smoking history, but there was no statistical significance difference. Exercise duration time was significantly decreased in patients with microvascular angina (p<0,05). Serum lipoprotein (a), total cholesterol, LDL-cholesterol, HDL-cholestrol, Triglyceride, ESR, Fibrinogen and Homocystein value were no significant difference between microvascular angina and control group. Only CRP was significantly high in patients with microvascular angina (p<0.05). Conclusion : There was no statistical significance difference in age, sex, hypertension, DM and smoking history between two groups but patients group had a tendency to increase the prevalence in hypertension, DM and smoking history, female. Also, Symptom improvement and disappearance in follow-up was presented in 11 patients of 19(57.9%). Exercise tolerance was worse in patients group than control group. CRP value was significantly higher in patients group than control group. There was no statistical significance difference in lipoprotein (a), total cholesterol, LDL-cholesterol, HDL-cholesterol, triglyceride, homocystein, ESR and Fibrinogen between two groups.

열대열 말라리아 치료 후 발병한 삼일열 말라리아 1예

이건화,김태형,박노진 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Endemic malaria in the northen parts of the Republic of Korea is caused by P. vivax. And imported malaria cases in Korea from south Asia, Indian subcontinents are usually caused by P. falciparum species. We report a case P. vivax malaria after successful treatment of P falciparum malaria with a review of literatures. Co-infection of P. vivax and P. falciparum, which relapsed only with P. vivax, after successful treatment of P. falciparum malaria was considered. A 38-year old Bangladeshi woman who had lived in Korea visited our hospital due to fever and headache. Eight months ago, she was admitted to a hospital in Calcutta in India because of P. falciparum malaria. She was treated successfully with mefloquine and doxycycline. In this time she was presented with features of malaria with every-other day fever. Awaiting the species identification, we empirically prescribed mefloquine and doxycycline. But the peripheral blood smear showed erythrocytic schizogony, trophozoite and gametocytes typical of P. vivax. So she was finally treated with hydroxychloroquine and primaquine. The patients was well during outpatient follow up period.

IC 실현에 적합한 정현파 능동 발진기의 회로 및 특성에 관한 연구(Ⅱ)

이원건,손태호,박종연 江原大學校 産業技術硏究所 1991 産業技術硏究 Vol.11 No.-

Two kinds of simple active oscillators are proposed and analyzed assuming that operational amplifier has two-poles frequency characteristics. The first circuit is composed of one operational amplifier, one resistor and one grounded capacitor. The second oscillator is realized with one operational amplifier and three resitors. Proposed oscillators have the low sensitivity of the oscillation frequency for little variations of the passive element values. By the experimental results obtained with Op-Amp.?A741, the simple oscillators can be useful for the frequency range 1.25 KHz≤f? ≤400KHz for the active -R ocillator, and it is shown to transform the active-R oscillator circuit into the voltage controlled type.Therefore, two kinds of oscillators circuit are attractive for the IC realization, because they hve one operational amplifier, one resistor and one grounded capacitor, or three resistors.

구미산업단지 대기중 휘발성유기화합물(VOCs)의 농도특성

최우건,배상호,박덕신,정연구,김태오 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3

This study focuses on the measurement of airborne Volatile Organic Compounds (VOCs) in the Kumi electronic industrial complex during the time periods of August and September, 2002 and January and February, 2003. This study was based on the US-EPA method TO-14 while the VOCs were analyzed with GC/MSD. The toluene level revealed high concentration at all measurement sites. The areal rank of average concentrations of VOCs is as follows : industry l>industry2>urban>middle>residential. Concentrations of VOCs in Kumi electronic industrial ones were generally higher than at Yeochon and Ulsan industrial complexes. Dichloromethane and trichloroethylene, which are used as a cleaner in the process of electronic industries, were observed 4 to 8 times higher than those of other areas. Among the aromatic compounds, toluene showed the highest level, while the concentrations of dichloromethane and trichloroethylene were higher than those of other halogen compounds. In Kumi, toluene, trichloroethylene, and dichloromethane were confirmed as the major compounds of VOCs by this research.

Cu-SiO₂촉매상에서 메탄올의 메틸포메이트로의 탈수소 반응에 관한 연구

김경림,박해경,설용건,이태희,전민기 연세대학교 산업기술연구소 1990 논문집 Vol.22 No.2

Cu-SiO₂촉매상에서 구리의 함량을 달리하며 메탄올을 반응물질로 하여 탈수소 반응을 고정층 연속흐름 반응기에서 행하였다. 조작조건의 범위는 온도 175∼250℃, 압력 ?? 접촉시간 0.013∼0.043g.cat.hr/mL이었다. 구리의 함량에 따라 전화율과 선택도가 달라지고 구리의 함량이 1.5wt.%일 때 메틸포메이트로의 수율이 가장 좋았다. 최적 조작 조건은 온도와 접촉시간이 각각 225℃, 0.033g.cat.hr/mL 부근이었다. 이온 교환법으로 제조된 1.5wt.% Cu-SiO₂촉매상에서 메탄올의 탈수소 반응의 활성화 에너지는 3.73kcal/mol이었다. The dehydrogenation of methanol to methylformate was studied over Cu-SiO₂catalyst prepared by ion-exchange method with the change of copper content in a fixed bed, continuous flow reactor. The ranges of experimental conditions were : at the temperature between 175℃ and 250℃, pressure at ??, and contact time between 0.013 and 0.043g.cat.hr/mL. Conversion and selectivity were changed with Cu content and yield of methylformate showed the highest value with 1.5wt.% Cu. The optimum conditions were 225℃, 0.033g.cat.hr/mL for reaction temperature and contact time, respectively. The activation energy of dehydrogenation of methanol to methylformate was 3.73kcal/mol over 1.5wt.% Cu-SiO₂.

슬라이딩 평면을 이용한 I-PD 제어계의 구성

김성근,박건우,고태언 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-

In this paper, I-PD controller by nearal network is designed using variable structure controller. The I-PD control system is stable in the sense that the error is inside the constraint set, the variable structure controller is idle. If the error hits the boundary of constraint, the variable structure controller begins operation to force the error back to the constraint set. Applying this control technique to the position control system using a DC servo motor as a driver, the control performance of controller is verified by the results of computer simulation.

쇼트피닝 가공한 평기어의 피로특성

정성균,정동건,박충식,김태형,이재헌 서울産業大學校 2002 논문집 Vol.53 No.1

In this paper, the effect of shot peening on the fatigue characteristics have been investigated. Two types of specimens were used to obtain the experimental results. One type of specimen was made by machining and heat-treating SCM415 steel. The other type of specimen was made by machining, heat-treating, and shot peening SCM415 steel. The hydraulic testing machine was used to do the fatigue test (R=0.1, 10Hz). The experimental results show that the fatigue life and strength of shot peened gear were largely improved compared with the unpeened gear.

유리섬유강화 복합절연재료의 열화특성에 관한 연구

이규철,유근민,김경석,박홍태 울산대학교 1996 공학연구논문집 Vol.27 No.2

본 연구에서는 주위 환경 열화에 따른 복합절연재료의 절연특성과 수명을 향상시키기 위해 고온에서 흡습량을 변화시켰을 때와 탈습량을 변화시켰을 때 흡십시료와 탈습시료의 전기적 특성 및 기계적 특성을 조사하였다. 유리섬유 각층의 흡습상수는 각각 1층에서 0.0117, 2층에서 0.0123, 3층에서 0.0152를 나타냈다. 전기적 특성 및 기계적 특성은 복합재료의 흡습에 따라 크게 떨어졌다. 70℃에서 습기가 완전히 건조되어도 흡습전의 전기적 및 기계적 특성을 얻기가 어려운 것으로 나타났다. 수분에 의해 발생한 복합절연재료내에 존재하는 많은 결함들은 에폭시 메트릭스와 필라사이에 존재하였다. The electrical and mechanical properties of moisture absorbed and moisture desorbed specimens were investigated to improve the insulating characteristics and the reliability of composite materials against environment aging. Moisture absorption constants with the layers of glass fiber showed 0.0117 in 1 layer, 0,0123 in 2 layer and 0.0152 in 3 layer, respectively. Although moisture was removed at 70℃, it was impossible to obtain the initial electrical and mechanical properties. Many defects induced by moisture were observed at the interface between epoxy matrix and filler in composite materials.

복부둔상에 의한 간 손상의 임상적 고찰

홍순찬,최상경,박순태,하우송,이진석,권수인,이영준,정은정,조현언,정광근,임병찬 대한외상학회 2000 大韓外傷學會誌 Vol.13 No.2

Because of the merit of nonoperative management of blunt hepatic trauma, which is the avoidance of operative morbidity, the use of nonoperative management has been extended. However the indications for such treatment have not been sufficiently determined. To suggest possible criteria for nonoperative management, we reviewed 95 cases with blunt hepatic injuries which were confirmed by abdominal exploration or abdominal CT in Gyeong Sang National University Hospital from January 1992 to October 2000. Of the 95 patients, 38 patients were treated with operation and 57 patients treated with nonoperative management. We analyzed the patients for age, sex, cause of injury, injured organ, injury grade, transfusion amount, and shock on admission, complications and mortality. The results are as follows; 1) The peak incidence of age was in the 3rd decade (20%), and the male-to-female ratio was 3:1. 2) The most frequent injury mechanism was traffic accidents (40, 42%). 3) The most frequently used diagnostic modality was abdominal CT (95 cases) in the nonoperative and the operative group. 4) On the liver injury scale of the American Association for the Surgery of Trauma (AAST), 13 were grade I, 18 were grade II, 10 were grade III, 13 were grade IV, and 3 were grade V in the nonoperative group ; 1 were grade I, 6 were grade II, 18 were grade III, 8 were grade IV, 4 were grade V, and 1 were grade VI in the operative group. 5) Between the nonoperative and the operative groups, there were significant differences in the systolic blood pressure in the first 8 and 24 hours, transfusion amount, and GOT/GPT level (p$lt;0.05). 6) In comparison of complication, there were 3 cases of heaptic abscess,1 case of intrahepatic hematoma, 1 case of bile leakage, 1 case of rebleeding in operative group (15.7%). There were 2 cases of intrahepatic abscess, 2 cases of intrahepatic hematoma, 4 cases of biloma, 1 case of subcapsular hematoma in nonoperative group (15.7%). In mortality cases, 6patients died in operative group. Among them, 5patiens died from DIC (disseminated intravascular coagulation) and multiorgan failure, 1patient died from ARDS (adult respiratory distress syndrome) in operative group and 2patients died from hypovolemic shock in nonoperative group. In conclusion, i) nonoperative management may be considered as a first choice in children and adults with blunt abdominal trauma and stable vital signs. ii) Patients with hemodynamically stable hepatic injury 8 hrs after resuscitation, even with an AAST OIS grade 4 injury, may be candidates for nonoperative management.

전기분해에 의한 계면활성제 함유 폐수처리에 관한 연구

이춘식,정병윤,하태명,박현건 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

This study was carried out to investigate the purification effect of wastewater included LAS by electrolysis treatment system. Wastewater included LAS treated electrolysis treatment process, temperature of inner treated system were high than those of this raw wastewater, temperature change was electrolysis oxidation of LAS wastewater both cathode and anode. Electrolysis oxidation was oxidized LAS by oxidants of chlorine and ozone, on the time, according to the result development of treated efficiency on electrolysis contact time.