유한이득 증폭기 대역폭 개선에 관한 연구

林承雨 충주대학교 1984 한국교통대학교 논문집 Vol.18 No.1

New circuits for realizing actively compensated finite gain amplifiers using operational amplifiers and resistor are described. Its performance is compared with those of the conventional ones and shown to offer a significantly improved bandwidth and phase. Experimental results confirm the theoretical predictions.

대동맥류의 외과적 치료

임승우,이동협,한승세,Im, Seung-U,Lee, Dong-Hyeop,Han, Seung-Se 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.7

Twelve patients underwent surgical interventions for aortic aneurysms consecutively from September 1986 to September 1990 in the Department of Thoracic and Cardiovascular Surgery, Yeungnam University Hospital. They were all men ranging in age from 25 to 68 years with the mean age of 48 years. Five patients of them had aneurysms involving ascending aorta, one aneurysm involving both ascending and descending aorta, four aneurysms involving descending thoracic aorta, and the others had aneurysms involving abdominal aorta. According to morphological classification, six cases of them were in dissection and the others in fusiform aneurysms. All the cases were pathologically true aneurysms and four of them were in acute status. According to causal classification, seven patients of them had atherosclerosis, three cystic medial necrosis, and the others had syphilis and trauma respectively. Six patients with ascending aortic aneurysm had annuloaortic ectasia with aortic regurgitation and underwent ascending aortic graft and aortic valve replacement[Bentall`s operation]. The others with descending thoracic and abdominal aortic aneurysms underwent Dacron graft replacement. Both hemorrhage necessitating reopening of the chest and wound dehiscence were observed in three patients and hoarseness in one patient. Cerebrovascular accident occurred three and a quarter years postoperatively in one patient and he died two days later. The others were followed up via OPD and have been doing well postoperatively.

자연기흉의 흡인법 치료 효과

임승우,이동협,이정철,Im, Seung-U,Lee, Dong-Hyeop,Lee, Jeong-Cheol 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.9

We have performed a prospective study to assess the efficacy of suction drainage in 45 patients with primary spontaneous pneumothorax and 15 patients with secondary spontaneous pneumothorax, treated by closed chest tube drainage with underwater seal during the period Jan. 1990 to Dec. 1990 at the Department of Thoracic and Cardiovascular Surgery, Yeungnam University Hospital. The patients were divided randomly into two groups, 28 cases receiving suction and the other 32 cases no suction. The success rate was 82.1% for the former and 87.5% for the latter with the overall success rate of 85.0% and there was no significant difference in success rate between the two groups According to the causes and the extent of pneumothorax, the difference between the success rates of the two groups was also not significant statistically. But according to the duration of air leakage, suction group under 2 days showed a high success rate[46.4%] and the same group with 3-4 days, a relatively low success rate[21.4%] compared with that of the former. We conclude that the suction treatment is somewhat valuable in shortening the tubing time in patients with small amounts of air leakage, but it doesn`t seem to increase the success rate in all patients.

개심술에서 냉각 심정지액 주입에 따른 심근온도의 변화

임승우 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.4

The myocardial temperature was monitored in 19 patients of open heart surgery using the Shiley myocardial temperature probe in Department of Thoracic and Cardiovascular Surgery, Yeungnam University Hospital. The myocardial temperature were measured time-wise: initial and 15 minutes following the infusion of the cardioplegic solution into the aortic root and upon reinfusion, which is 30 minutes apart from the initial. The measurements were made in the anterior wall of the right ventricle, the posterior wall of the left ventricle and the interventricular septum. Immediately after initial infusion, the temperature of the right ventricle[10.7 $\pm$4.3oC] was the lowest and that of the left ventricle[12.9$\pm$3.9 oC] the highest in the mean values among all 19 patients. However, no significant differences were noted among the different regions. At 15 minutes after infusion, the lowest temperature was in the right ventricle[17.5$\pm$5.1 oC], followed by interventricular septum[17.9$\pm$2.9 oC], and left ventricle[21.4$\pm$2.5 oC]. At 30 minutes after infusion, the lowest temperature was measured in the interventricular septum[13.6$\pm$2.7 oC ], followed by right ventricle[13.8$\pm$4.0 oC] and left ventricle[14.5$\pm$4.5 oC ]. Evaluating changes of myocardial temperature according to postinfusion time, the temperature at 15 minutes after infusion showed significant increase as compared with that immediately after the infusion in all three regions[p<0.05] and the temperature at 30 minutes after infusion showed significant decrease as compared with that at 15 minutes after the infusion in the left ventricle and the interventricular septum[p<0.05]. The left ventricle was rewarmed most rapidly and its temperature the highest in the mean values, Accordingly, the maintenance of optimal hypothermia of the left ventricle indicated a very careful factor in myocardial protection.

폐방선균증;1례 보고

임승우,이정철,한승세,Im, Seung-U,Lee, Jeong-Cheol,Han, Seung-Se 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.12

A 39 year-old woman presenting with a hemoptysis, pulmonary infiltrate was found to have thoracic actinomycosis by the specimens of excised lung. Recently, pulmonary actinomycosis is very rare by the widespread use of antibiotics. Clinical, radiological, and microbiological findings can be nonspecific. The diagnosis is dependent on a high index of suspicion. Chances for cure are excellent with lengthy antibiotic administration. The purpose of this paper is to review our experience and to remind us of pulmonary actinomycosis.

有限利得 增幅器의 能動補償에 關한 硏究

林承雨 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2

In many applications of operational amplifiers to high quality and precision electronic circuit, such as active RC filters, the frequency response characteristics of the opamp becomes the primary limiting factor in circuit performance. In this paper, means of compensating for the finite gain bandwidth of operational amplifier. when used in voltage-controlled voltage source structures, are described. A universal active compensation scheme is proposed which can be used with operational amplifier voltage controlled voltage source, When looked upon as a general three-port building block. It is shown that phase shift contributed by imperfect operational amplifiers are virtually eliminated over an extended frequency range. Experimental result are given

4次 帶域通過 RC 能動 濾波器 構成法에 對한 考察

林承雨 忠州大學校 1980 한국교통대학교 논문집 Vol.13 No.1

The low-pass to band -pass transformation is used to generate the band-pass functions. Band-pass functions can be readily obtained from low-pass functions by means of a simple transformation. In this paper I an going to study RC active filter having 4th-order band-pass characteristics by LP-BP transformation.

포스터 ( 천연물 및 유기합성 ) : 한국산 마늘 성분들의 항암성에 관한 연구

임승우,김태효,전문진 한국응용생명화학회(구 한국농화학회) 1996 한국응용생명화학회 학술발표회 Vol.1996 No.1

펄스부호변조 실험장치 설계에 대한 고찰

林承雨 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.2

The purpose of this paper is to desigh a PCM transmitter which is the basis of digital communication and to utilize it as a set for experiment.

핸드폰을 이용한 공장관리 시스템개발에 관한 연구

林承雨,洪炳昊 충주대 2001 한국교통대학교 논문집 Vol.35 No.2

In case of abnormality in the situation like interruption of electric power, low temperature and checking a thermostat, or the situation of industrial disaster caused by the gas leakage and a fire in any company, a manager gets the voice information about the current situation automatically by using the company management system.It can make the managers understand the whole situation through celluarphones automatically at the place where it is hard to establish telephone lines.Even if a manager is out far away, he is completely capable of meeting any difficult situation through the voice information.Therefore the manager can keep the damage at a minimum and protect facilities.