개심술 후 Plate를 이용한 지연성 흉골 봉합 1예 보고

박승일,조재민,이종국,Park, Seung-Il,Jo, Jae-Min,Lee, Jong-Guk 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.12

심장수술후 심근의 부종, 심근이완, 심한 술후 출혈 등이 동반된 환자에서는 흉골봉합에 의해 심한 혈역학적 장애가 발생된다. 심한 심부종으로 흉골 봉합시 흉골 일부분에 의한 심압박에도 혈혁학적 장애를 일으키는 경우도 있다. 본 교실에서는 54세의 비만 여성에서 관상동맥 우회술후 Synthes DCP wide plate를 이용한지 연성 흉골 봉합을 경험하였으며, 이러한 지연성 흉골봉합이 심부종이 심한 환자에서는 상당히 효과적이고 간단한 방법임을 확인하였다. 관상동맥 우회술후 16시간만에 성공적으로 지연성 흉골봉합을 경칩하여 좋은 성적을 얻었기에 보고 하고자 한다. Severe hemodynamic dysfunction may follow after the closure of the median sternotomy in patients with myocardial edema, cardiac dilatation, and severe postoperative bleeding. In extreme cases, myocardial edema may be so severe that cardiac function is compromised merely by the edges of the open sternum touching the heart. Sternotomy remained open and delayed sternal closure is already described adjunct in complicated cardiac operations. We experi nced a case of delayed sternal closure after 16 hours of CABG using synthes DCP wide plate in a 54-year old obese female patient. Our experience conims that delayed sternal closure Is an effective at simple means of dealing with severe myocardial edema so we report this case with literature review.

폐 국균증의 수술적 치료

박승일,손광현,Park, Seung-Il,Son, Gwang-Hyeon 대한흉부심장혈관외과학회 1993 Journal of Chest Surgery (J Chest Surg) Vol.26 No.10

Pulmonary aspergilloma resulting from colonization of Aspergillus fumigatus is potentially life-threatening disease due to massive hemoptysis. Between August 1990 and November 1993, twelve patients were operated for the treatment of pulmonary aspergilloma. The mean age was 38.8 years. All patients had underlying cavitary lung disease, and the tuberculosis is the most common cause. Ten patients have experienced hemoptysis, but the clinical presentation of hemoptysis at the time of operation was mostly intermittent and scanty. Operative procedures were segmentectomy in 1 patient, lobectomy in 8, pneumonectomy in 2, and pleuropneumonectomy in 1. There were three complications, bronchopleural fistula in one patient and prolonged air leak in 2. There was no postoperative death. Conclusively, our results suggest that established aspergilloma associated with tuberculosis or other cavitary lesions should undergo early elective pulmonary resection, even though it has only minimal hemoptysis.

변형 Konno 술식을 이용한 죄심실 유출로 협착의 수술치험 - 3례 보고 -

박승일,김용진,Park, Seung-Il,Kim, Yong-Jin 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.1

The results of conventional operative resection of diffuse subaortic stenosis[tunnel subaortic stenosis] have been less than satisfactory. We have performed modified Konno operation to enlarge the outflow tract of both ventricle with a patch in three patients with diffuse tunnel subaortic stenosis in the department of Thoracic and Cardiovascular Surgery, Seoul National University Children`s Hospital. Preoperative left ventricular aortic pressure gradients were 135 mmHg, 50 mmHg, 80 mmHg respectively in these patients. After right ventriculotomy, the septotomy was done and extended beyond the limit of the stenosis and fibrous and/or muscular tissue was removed from each edge of septal incision. After adequate widening of the tunnel subaortic stenosis with various patches, right ventricle was closed primarily or with prosthetic patches successfully. One patient who was diagnosed as complete atrioventricular septal defect had complete AV block preoperatively and was implanted permanent pacemaker, and others who were sinus rhythm preoperatively have no serious postoperative rhythm disturbance. One patient developed mild postoperative aortic insufficiency and one who had preoperative aortic insufficiency has still same grade of aortic insufficiency after operation. All had good postoperative hemodynamics without any postoperative residual pressure gradient.

선천성 심장기형 환자에서 조기술후 심실 전부하 용적과 심박출량의 상호 관계 및 혈역학적 변화 분석

박승일,김응중,김용진,Park, Seung-Il,Kim, Eung-Jung,Kim, Yong-Jin 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.1

Postoperative cardiac performance of cyanotic congenital heart disease is somewhat different from that of other cardiac diseases. For the evaluation of postoperative cardiac performance in the cyanotic congenital heart disease we measured cardiac output by thermodilution technique at 1, 4, 8, 12, 16, 20, 24, 36, 48 postoperative hours in 14 patients operated from Feb. 1989 to Nov. 1989 in The Department of Thoracic and Cardiovascular Surgery, Seoul National University Children`s Hospital. At the same time, we checked left atrial pressure [LAP], central venous pressure [CUP], and mixed venous oxygen saturation [SvO2] to detect correlation between them. Immediate postoperative cardiac index was 3.585 $\pm$ 0.945 L/min/m2, and it decreased maximally to 3.322$\pm$1.007 L/min/m2 at postoperative 16 hours. After then it increased and stabilized from 36 hours after operation, and its value was 4.426$\pm$1.358 L/min/m2. There were no correlations between cardiac index and left atrial pressure or central venous pressure. Between mixed venous oxygen saturation and cardiac index, there was no correlation in the early postoperative period but after postoperative 16 hours, there was significant correlation between them and correlation coefficients were 0.573 [16hrs], 0.743 [20hrs], 0.436 [24hrs], 0.560 [36hrs], 0.636 [48hrs], respectively. From these results, we concluded that in the corrective surgery of cyanotic congenital heart disease, cardiac performance was depressed in the early postoperative period. It improved from postoperative 16 hours, and stabilized from 36 hours after operation. During early postoperative period, mixed venous oxygen saturation should not be used as a predictor of cardiac performance but it could be used as a predictor of cardiac performance from 16 hours after operation.

변형 Blalock-Taussig 수술법이 폐동맥성장에 미치는 영향

박승일,김용진,Park, Seung-Il,Kim, Yong-Jin 대한흉부심장혈관외과학회 1989 Journal of Chest Surgery (J Chest Surg) Vol.22 No.2

Modified Blalock-Taussig operation remains the standard technique of systemic-to-pulmonary artery shunt in patients of congenital heart disease with decreased pulmonary blood flow. We reviewed the 41 patients who had been performed modified Blalock-Taussig operation from March 1985 to Feb. 1988, and angiographically measured pulmonary artery size before and after shunt, and calculated pulmonary artery index [PAI] and ratio of left and right pulmonary artery to descending aorta[[LPA+RPA]/dAo]. The mean duration of palliation after shunt operation was 624 days and mean age of the patient at shunt operation was 3.59 years. Mean PAI increased significantly from 131.15*67.11 mm2/M2 preoperatively to 232.70*84.46 mm2/M2 postoperatively. Mean ratio of right and left pulmonary artery to descending aorta also increased significantly from 1.48*0.40 preoperatively to 1.92*0.50 postoperatively. All patients manifested clinical improvement; there was mean decrease in hematocrit of 8.95%, mean increase in arterial oxygen saturation of 11.08%. Pulmonary arterial growth was not influenced by age at operation, initial pulmonary artery size, or graft size, but significantly influenced by antegrade flow. The patients who have some antegrade flow were in more increase of PAI. There were no linear correlation between change of PAI, change of [[LPA+RPA]/dAo], SaO2, and duration. But, according to Scatterplot between change of PAI and duration, some complex correlation was suggested and mean PAI was decreased after 2-year palliation. We concluded that modified Blalock-Taussig operation is excellent palliative surgery for pulmonary artery growth especially on the patient who have some antegrade flow, and the proper duration of palliation was about 2 years.

공간적 상관도가 큰 채널에 강인한 다중 안테나 선택 및 스위칭 시스템

박승일(Seung-il Park),심세준(Seijoon Shim),이충용(Chungyong Lee) 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.11

다공성 연소기 모델로서의 다중 채널 연소기 내부 화염의 안정화 특성 기초 연구

박승일(Seung Il Park),이민정(Min Jung Lee),김남일(Nam Il Kim) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.8

다공성 물질 내부의 연소 현상은 저발열량 연료의 연소 및 연소열의 재생을 위한 수단으로 다양한 형태로 산업현장에 응용되고 있다. 하지만 다공성 물질 내부에서의 연소 현상은 직접적인 관찰이 힘들다는 점과 다공성 물질의 복잡한 내부 구조로 인해 매우 제한적인 연구가 진행되어 왔다. 본 연구에서는 복잡한 다공성 물질의 구조 내부에서의 화염의 안정화 특성에 관한 이해를 위해 내부 관찰이 가능하도록 다수의 석영판으로 구성된 다중채널 형태의 모형 연소기를 제안하고 이를 이용한 간단한 실험 결과를 제시한다. 그리고 이러한 다중채널 내부 화염의 안정화에 관한 간단한 기초해석 모델을 제안한다. 다수의 채널 내부에 형성된 화염은 채널간의 열전달에 의해 화염의 공간 분포가 변화하고 그 결과로 연소기 내부의 가연한계에 변화가 발생한다. 채널의 재료 특성 및 당량비에 따른 가연한계의 변화를 제시하였으며, 이 결과는 다공성 연소기 내부화염의 이해에 도움될 것이다. Combustion phenomena in porous media combustors are widely used in industrial fields for the combustion of lowgrade fuels and the regeneration of combustion heat. However, studies of combustion phenomena in porous media have been limited, because these phenomena are difficult to observe, and the configurations of porous media are complex. We propose a simple model combustor: a multi-channel combustor that consists of many layers of combustion channels made of quartz plates. We conducted an experimental observation of the flames in the multi-channel combustor and obtained experimental results for the flame stabilization limits. Flames formulated in the multi-channel combustor showed variation in the spatial distribution depending on the heat transfer between neighboring channels. A simple analytical model was developed and the variation in the flammability limits of the multi-channel combustor was discussed. This study will enhance our understanding of flame behavior in a porous-media combustor.

산화 알루미나 입자 첨가에 따른 동축류 예혼합 연소기의 연소 특성 기초연구

박승일(Seung Il Park),김고태(Go Tae Kim),김남일(Nam Il Kim) 한국연소학회 2011 한국연소학회지 Vol.16 No.1

Thermal spray technology has been used in many industrial application. Especially, thermal spray coating have been employed with the purposes of achieving better resistances in abrasion, heat and corrosion. In the previous studies on the thermal spray coating, thermal spray characteristics from the perspective of combustion engineering have not been investigated sufficiently, while the material characteristics of the coated substrates have been investigated widely. In this study, the effect of spray particles on the flame behavior was experimentally investigated. The amount of the injected particles was measured using the light scattering method and the temperature of the particles was estimated using a two-color method. Various flame-spray interactions were observed and it was found that the high temperature zone near the flame is elongated by particles density. Based on these results, the applicability of the light scattering method and the two-color method was discussed.

발수 코팅처리한 경량골재콘크리트의 흡수율 및 성상변화에 관한 실험적 연구

박승일(Park Seung-Il),사순헌(Sa Sun-Heon),김상헌(Kim Sang-Heon),지석원(Ji Suk-Won),서치호(Seo Chee-Ho) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

A main composition of the lightweight aggregate is a polycrystal qualitative plastic because of the fact, the characteristic of the aggregate is that the vast quantity of air gap is formed inside the aggregate. t As a matter of the characteristic, the moisture in the aggregates tends to move irregularly according to the change in the outer condition. Consequently a measure to solve the problem is needed. In this research as a part of the study on the performance improvement of light weight aggregates by coating, the absorptance variation and the change on time of the coated light weight aggregates were compared and analyzed for ensuring the workability of lightweight aggregates concrete by preventing from absorption to inner aggregates by impregnation of water repellent and oil repellent.

염료감응태양전지 모듈의 수명개선 위한 설계최적화 연구

박승일(Seung Il Park),한창운(Changwoon Han) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.4