평면트러스로 지지된 리프트 게이트의 진동특성

이성행,양동운,함형길,공보성,신동욱,Lee, Seong-Haeng,Yang, Dong-Woon,Hahm, Hyung-Gil,Kong, Bo-Sung,Shin, Dong-Wook 한국농공학회 2012 한국농공학회논문집 Vol.54 No.3

Dynamic characteristic of lift gate supported by plane truss is studied by a model test scaled with the ratio of 1 : 31.25 in the four major rivers project. The vibrations of gate supported by the plane truss is assessed in comparison with those of gate supported by the space truss which was tested formerly. The gate model is made of acryl panel and calibrated by lead. A model test is conducted under the different gate opening and upstream water levels conditions in the concrete test flume dimensioned 1.6 m in width, 0.8 m in height and 24 m in length. In order to verify the model, natural frequencies of the model gate are measured, and compared with the numerical results. The vibrations of gate model supported by the plane truss in opening height of 1.0 cm~2.0 cm shows greater than one supported by the space truss. It is found that the gate model supported by the plane truss is less desirable than one supported by the space truss. thus, the latter type of gate model is requested to design.

하공정맥 손상의 치험 1례

이성행 대한흉부심장혈관외과학회 1973 Journal of Chest Surgery (J Chest Surg) Vol.6 No.2

Because of the. rise in the incidence of high speed automobile accident and various gun shot wound, complicated vascular injuries are becoming more frequent. Inferior vena caval injury seems to be also in high incidence, but reports in the literature were rare. because of potentially lethal. Recently we have experienced a case of inferior vena caval injury due to stab wound on the posterior aspect of the right abdomen. This was successfully treated with inferior caval ligation on the both, proximal and distal of the injured infrarenal vena cava.

Valsalva 동의 선천성 동맥류 파열: 2례 수술 경험

이성행 대한흉부심장혈관외과학회 1977 Journal of Chest Surgery (J Chest Surg) Vol.10 No.1

Two cases of congenital aneurysm of sinus of Valsalva, ruptured into the right ventricle, and associated with ventricular septal defects, were undergone intracardiac repair with the aid of extracorporeal circulation using Bentley bubble oxygenator and moderate hypothermia. Case 1. A 20 year old male, with the chief complaints of palpitation and dyspnea, was admitted to Kyungpook National University Hospital on Dec. 16, 1976. Continuous machinery murmur was heard best at left 3rd. intercostal space along the sternal border. Retrograde aortography disclosed aneurysm of the right coronary cusp, which ruptured into the right ventricle. Utilizing cardiac bypass and moderate hypothermia, the right ventricle was opened and aneurysm was closed by direct sutures. Associated ventricuar septal defect was directly ,closed and suture line was reinforced by Dacron patch. Total bypass time was 112 minutes and total aortic cross clamping time was 37 minutes. Assist ventilation was carried out for 28 hours postoperatively. His postoperative course was smooth except removal o1 substernal hematoma and he was .discharged on 24th postoperative day. Case 2. A 28 year old man was admitted to our Hospital on June 9, 1976. two weeks prior to this admission, suddenly he had collapsed while he was walking on the street. Following `this episode, palpitation, dyspnea on exertion and frequent respiratory infection developed. Grade IV systolic murmur was heard best at 3rd intercostal space along the sternal border. Retrograde aortography confirmed the diagnosis of rupture of aneurysm of the sinus Valsalva ruptured into the right ventricle. Under the cardiopulmonary bypass the right ventricle was opened and ruptured aneurysm and infracristal ventricular septal defect were directly closed and reinforced with Dacron patch. Postoperative course was uneventful and he was discharged on 14th postoperative day. The pathogenesis of aneurysm of the sinus Valsalva and mode of diagnosis were discussed. Principle of surgical repair was presented.

우심방에 발생한 원발성 섬유성 육종: 1례 치험 보고

이성행 대한흉부심장혈관외과학회 1977 Journal of Chest Surgery (J Chest Surg) Vol.10 No.1

A 51 year old man was admitted to the Thoracic and Cardiovascular Department of Kyungpook University Hospital on April 7, 1976, with chief complaints of orthopnea and the chest pain for about 3 months. Physical examination showed narrow pulse pressure, puffy face, engorged neck veins at sitting position, distant heart sound, enlarged liver and edematous upper extremities. The chest roentgenogram demonstrated markedly enlarged cardiac silhouette. Low voltage and the low to diphagic T`s were noted on the electrocardiogram. Paroxysmal ventricular tachycardia was developed intermittently and was subsided spontaneously. Repeated pericardiocentesis were performed each of which yielded from 100 to 300ml. but intractable cardiac failure was progressed. The bacteriology and cytology of the pericardial fluid were not revealed any specific findings. The pericardiectomy was performed to release the intractable cardiac tamponade. Pericardium was found to be thickened and cardiac constriction was noted. The thickened pericardium was easily removed. A large hen`s egg sized dark blue tumor mass occupied the anterior wall of the right atrium and two thumb tip sized pearl gray tumors were placed at the just below portion of the main pulmonary artery. The biopsy report revealed primary fibrosarcoma of the heart. The patient was improved from the symptoms of the cardiac failure during the postoperative course.

Pneumotachograph 로 측정한 건강인의 동적 폐 Compliance

이성행 대한흉부심장혈관외과학회 1977 Journal of Chest Surgery (J Chest Surg) Vol.10 No.2

Dynamic lung compliance was measured in healthy ten young[mean age, 26 years] male and five young[mean age, 25 years] female. Lung volume was integrated of the rate of flow signal which was obtained by using pneumotachograph and differential pressure transducer[PM 5, Statham]. Intrapleural pressure was measured as that of intraesophagel pressure. Esophageal ballon, 15. 5cm in length, 4ml of luminal capacity and made of thin latex, was connected to the polyethylene tube that had 12-14 side holes and was of 1.5mm of ID. Transpulmonary pressure was traced by means of differential pressure transducer[PM 131, Statham] to which connected the esophageal balloon catheter and connection tube from mouth piece. Lung volume and transpulmonary pressure were photographed by cathode ray oscilloscope camera while the subjects were breathing spontaneously. Dynamic lung compliance loop was displayed on single trace monitor and subtraction was performed for the quasi-static hysteresis. Dynamic lung compliance was measured, 1. by plotting the pressure-volume relationship 2. from the subtracted pressure-volume loop. Results were as follows. 1. Dynamic lung compliances measured by plotting of healthy young male and female were $0.202{\pm}0.06$ and $0.190{\pm}0.023L/cm$ $H_2O$ respectively. 2. When measured from subtraction loop, dynamic lung compliance for male and female were $0.327{\pm}0.107$, and $0.27{\pm}0.06L/cm$ $H_2O$ respectively. 3. Dynamic chest wall and total respiratory system compliance were also measured. 4. Dynamic lung compliance by plotting appeared to be essentially same when compared to that of static compliance reported previously from our laboratory, however, that obtained from subtraction loop revealed higher values than the compliances obtained by plotting and that of static compliance.

체외순환을 위한 혈액희석법에 대하여

이성행 대한흉부심장혈관외과학회 1977 Journal of Chest Surgery (J Chest Surg) Vol.10 No.2

Open heart surgery has been performed on 20 patients, using hemodilution principle under the moderate hypothermia from Dec. 1975 through Aug. 1977 at the Department of Thoracic and Cardiovascular Surgery, Kyungpook National University School of Medicine. All these patients, body surface area ranged from 0.53 to 1.67$M^2$, were divided into two groups as a child group [below 15 yrs] and a adult group[above 15 yrs]. The oxygenator were primed with fresh ACD blood, 5 per cent dextrose, Hartmann`s solution, 15 per cent mannitol, sodium bicarbonate, dexamethasone and antibiotics. The average flow rate was 2.0 L/$M^2$/min. in child group and 2.3L/$M^2$/min. in adult group. The degree of hemodilution in child and adult group was 30.7% and 29.3% respectively. The minimal value of rectal temperature was $30.84{\pm}0.7^{\circ}C.$, in child group and $30.0{\pm}1.5^{\circ}C.$, in adult group. We studied the changes of hemodynamic status, blood components, electrolyte, acid-base status. blood lactic acid and urine output during and after cardiopulmonary bypass.

흉부외과영역에 있어서의 출혈과 응급처치

이성행 대한의학협회 1974 대한의학협회지 Vol.17 No.1

트러스형 리프트 게이트의 진동현상에 관한 모형실험

이성행,김하집,박영진,함형길,공보성,Lee, Seong-Haeng,Kim, Ha-Jip,Park, Young-Jin,Hahm, Hyung-Gil,Kong, Bo-Sung 한국농공학회 2011 한국농공학회논문집 Vol.53 No.3

A model test is carried out to investigate the vibration of truss type lift gate in the four major rivers project. The gate model scaled with the ratio of 1 : 25 is made of acryl panel dimensioned 1.6 m in width, 0.28 m in height in the concrete test flume. Firstly natural frequencies of the model gate are measured and the results are compared with the numerical results in order to verify the model. The amplitudes of the vibration are measured under the different gate opening and water level conditions. The results are analyzed to study the characteristics of the gate vibration according to the small gate opening, the large gate opening and the overflow conditions. These test results presents a basic data for the guide manuals of gate management and a design method to reduce the gate vibration of truss type lift gate. Finally, the vibration of truss type lift gate are assessed in comparison with those of formerly tainter gate.

콘크리트 박스거더교의 상판 아스팔트 두께에 따른 최저 설계 유효온도 산정

이성행 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.12

This study examined the minimum effective temperature adjustment value and effective temperature in winter according to the thickness of the upper asphalt pavement of a concrete box girder bridge. Three concrete box girder specimens with asphalt thicknesses of 0 mm, 50 mm, and 150 mm were manufactured. The temperature data were measured during the winter, and the effective temperature was analyzed. Seventeen and 23 temperature sensors were attached to each model, and a set of 3604 temperature data was measured for three months, 48 sets a day. The lowest effective temperature in winter was calculated based on this. The effective temperature of -15℃ was analyzed to be –9.9℃, -9.2℃, and -6.8℃ at 0mm, 50mm, and 150mm, respectively. At the lowest temperature (-15~13°C), each model was calculated to be 0.3°C to +1.7°C higher than the Eurocode, and the overall value was similar to the Eurocode. As a result of the analysis, the adjustment value of the minimum effective temperature according to the thickness of the asphalt was derived as +0.5℃ and +2.7℃ for 50mm and 150mm, respectively, based on 0mm. In the 50mm model designed the most, the effective temperature of the concrete bridge does not increase much compared to the steel bridge. Judging from the minimum effective temperature calculated in this study, it was judged that the minimum design temperature of the highway bridge design criteria in the normal climate area of the concrete bridge needs to be re-examined from –5℃ to -9.2℃. 본 연구에서는 콘크리트 박스거더교의 상부 아스팔트 포장 두께에 따른 겨울철 최저 유효온도 조정값과 유효온도를 연구한다. 이를 위하여 0mm, 50mm, 150mm의 아스팔트 두께를 갖는 3개의 콘크리트 박스거더 시험체를 제작하고, 겨울철 기간동안 온도 데이터를 측정하고 유효온도를 분석한다. 각 모형에 17개와 23개의 온도센서를 부착하여, 하루에 48세트씩 3개월간 3604 온도 데이터를 세트를 측정하고, 이를 바탕으로 겨울철 최저 유효온도를 산정한다. 대기온도 -15℃의 유효온도는 0mm, 50mm, 150mm에서 각각 -9.9℃, -9.2℃, -6.8℃로 분석된다. 최하위 온도(-15∼-13℃)에서 각 모형은 Euro code보다 0.3℃∼+1.7℃ 높게 산정되고, 전체적으로 Euro code와 매우 유사한 값을 보인다. 분석결과 아스팔트 두께에 따른 최저 유효온도의 조정값은 0mm를 기준으로 했을 때, 50mm 150mm 대하여 각각 +0.5℃, +2.7℃로 도출된다. 가장 많이 설계되는 50mm 모형에서 콘크리트교 유효온도는 강교에 비하여 증가가 별로 없음을 볼 수 있다. 본 연구에서 산정된 최저 유효온도로 판단할 때, 콘크리트교 보통기후 지역에서 현 도로교 설계기준의 최저 설계온도는 –5℃에서 –9.2℃이하로 재 검토되어야 할 필요성이 있는 것으로 판단된다.

수리모형 실험에 의한 배수갑문 원호형 문비의 하부형상에 대한 진동현상 연구

이성행,Lee Seong-haeng 한국관개배수위원회 1996 한국관개배수논문집 Vol.3 No.1

A hydraulic model test was peformed for radial gate in estuary sulices to find out a proper bottom shape of gate which minimize the amplitudes of vibration. Firstly natural frequencies ore measured, and the results were compared with the numerical analysi