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Analysis of engine load factor for a 90 kW agricultural combine harvester based on working speed
도영우,김택진,임류갑,백승윤,전현호,김용주,김완수 충남대학교 농업과학연구소 2023 Korean Journal of Agricultural Science Vol.50 No.4
This study aimed to evaluate the engine load factor (LF) of a 90 kW agricultural combine harvester. The combine harvester used in this study is equipped with an electronic engine, and real-time engine data (torque and speed) was collected through a controller area network. The speed of the combine harvester during harvesting operation was divided into three levels (4, 5, and 6 km/h) for the representative operation speed range of 4 to 6 km/h. The LF was calculated using the engine load data measured in real time during harvesting. A weight was applied to the LF for each condition based on a survey of the usage. Results of the field test showed that the LF was 0.53, 0.64, and 0.87 at working speeds of 4, 5, and 6 km/h, respectively. The highest engine load factor was recorded at 6 km/h. Finally, based on the weight for the usage applied, the integrated engine LF was analyzed to be 0.69, which is approximately 144% higher than the currently applied LF of 0.48. A study on LF analysis for the entire work cycle, including idling and driving of the combine harvester, will be addressed in a future study.
Combined Bilateral Lung Transplantation and Off-Pump Coronary Artery Bypass
도영우,정희석,이창영,이진구,윤영남,백효채 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.6
Coronary artery disease has historically been a contraindication to lung transplantation. We report a successful combined bilateral lung transplantation and off-pump coronary artery bypass in a 62-year-old man. The patient had a progressive decline in lung function due to idiopathic pulmonary fibrosis and a history of severe occlusive coronary artery disease.
도영우,이창영,이성수,김하은,김봉준,이진구 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.6
Spontaneous perforation of the esophagus after forceful vomiting is known as Boerhaave syndrome, a rare and life-threatening condition associated with a high rate of mortality. The management of Boerhaave syndrome is challenging, especially when diagnosed late. Herein, we report the successful management of late-diagnosed Boerhaave syndrome with T-tube drainage in a 55-year-old man. The patient was transferred to our institution 8 days after the onset of symptoms, successfully managed by placing a T-tube, and was discharged on postoperative day 46 without complications.
Bleomycin 유도 폐독성에 동반된 자연성 종격동 기종
도영우,조석기,이영옥,이응배 대한흉부외과학회 2008 Journal of Chest Surgery (J Chest Surg) Vol.41 No.6
Pneumomediastinum is a rare, but well recognized complication of bleomycin-induced lung toxicity. Spontaneous pneumomediastinum has to be considered as one of the causes when the dyspnea becomes aggravated in patients with bleomycin induced lung toxicity. We describe here two patients who suffered with germ cell tumor and they developed spontaneous pneumomediastinum without pneumothorax, and this was caused by bleomycin-induced lung toxicity
대동맥 협부의 내막파열을 가진 고위험군 대동맥박리환자에서 시행한 스텐트 그라프트 삽입 −1예 보고−
도영우,김근직,조준용,이종태 대한흉부외과학회 2010 Journal of Chest Surgery (J Chest Surg) Vol.43 No.4
Recently, stent-graft insertion has been widely used along with surgery for treatment of thoracic and abdominal aortic aneurysm. However, use of stent-graft insertion is controversial in descending aortic dissection. We report here on our experience of a patient who received a stent-graft for descending aortic dissection that nearly ruptured. Based on CT findings at three months follow up, results were satisfactory. 최근 흉부 및 복부 대동맥류 질환에 대해 스텐트 그라프트 삽입이 수술적 치료와 함께 널리 시행되고 있다. 그러나 하행 대동맥박리인 경우 스텐트 그라프트 사용에 대해서는 논란의 여지가 있다. 저자들은 파열이 임박한 하행 대동맥박리 환자에서 스텐트 그라프트를 삽입하여 치료 후 3개월 뒤의 흉부전산화단층촬영에서 양호한 결과를 얻은 경험이 있기에 이를 보고하는 바이다.
Direct Axillary Arterial Cannulation Using Seldinger’s Technique in Aortic Dissection
도영우,김근직,박일,조준용,이종태 대한흉부외과학회 2011 Journal of Chest Surgery (J Chest Surg) Vol.44 No.5
Background: The axillary artery is frequently used for cardiopulmonary bypass, especially in acute aortic dissection. We have cannulated the axillary artery using a side graft or by directly using Seldinger’s technique. The purpose of this study was to assess the technical problems and complications of both cannulation techniques. Materials and Methods: From January 2003 to December 2009, 53 patients underwent operations using the axillary artery for arterial cannulation. The axillary artery was cannulated with a side graft in 35 patients (side graft group) and directly using Seldinger’s technique in 18 patients (direct group). Results: The results were compared between two groups, focusing on cannulation-related morbidities including neurologic morbidity. Arterial damage or dissection of the axillary artery occurred in 1 (2.9%) patient in the side graft group and in 1 (5.6%) patient in the direct group. Malperfusion and insufficient flow did not occur in either group. There were no postoperative complications related to axillary cannulation, such as brachial plexus injury, compartment syndrome, or local wound infection, in either group. Conclusion: Technical problems and complications of the axillary arterial cannulation in both techniques were rare. Direct arterial cannulation using Seldinger’s technique was done safely and more simply than the previous technique. It was concluded that both axillary arterial cannulation techniques are acceptable and it remains the surgeon’s preference which technique should be used.
작업 조건에 따른 45 kW급 마늘 수집기의 부하 분석
도영우 ( Young-woo Do ),문석표 ( Seok-pyo Moon ),권승귀 ( Seung-gwi Kwon ),남영조 ( Young-jo Nam ),김완수 ( Wan-soo Kim ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2
최근 밭작물 기계 개발의 필요성이 높아지고 있으나, 마늘 수확 작업의 기계화율은 43.8%에 머물고 있어 마늘 수확 기계 개발의 필요성이 증대되고 있다. 국내 일부 제조사에서는 마늘 수집기를 개발하여 상용화하였으나, 기존에 개발된 마늘 수집기는 경험적인 방법에 의해 설계되어 동력 최적화 및 최적 설계를 위한 기초 데이터 확보가 필요하다. 본 연구는 마늘 수집기의 최적 설계를 위한 기초연구로써, 마늘 수집기의 작업 부하를 계측 및 분석하기 위하여 수행되었다. 본 연구에서는 45 kW급 마늘 자주식 수집기를 사용하였으며, 사용된 수집기는 마늘을 수집하는 수집부, 이물질을 분리하는 이송부, 크롤러 형태의 주행부로 구성된다. 필드 실험은 아스팔트와 토양 조건에서 수행되었으며, 토양에서는 굴취 깊이를 3수준(8.5, 10, 13 cm)으로 나누어 실험을 수행하였다. 마늘 수집기 부하계측시스템은 크롤러의 스프로킷 토크 측정용 토크센서, 스프로킷 회전속도 측정용 엔코더, 주행속도 측정용 GPS, 데이터 수집용 계측기로 구성되었다. 필드 실험 결과, 아스팔트 조건에서 수집기의 좌우 스프로킷의 평균 토크값은 431 Nm로 나타났다. 수집작업시 굴취깊이가 8.5cm, 10, 13 cm에서 각각 평균 토크값은 710, 775, 780 Nm로 나타났다. 이는, 아스팔트 노면조건에서의 단순주행 대비 약 65~81% 높은 수치이다. 또한, 굴취 깊이별 우측 스프로킷의 평균 토크값은 각 경심(8.5, 10, 13 cm)에서 좌측 대비 각각 35, 71, 56% 높게 나타났으며, 이는 수집기 플랫폼의 엔진, 운전석 등 주요 부품의 무게 배분 등에 의한 것으로 판단된다. 본 연구의 결과는 향후 플랫폼 동력분배 개선 및 최적 설계 등에 활용될 수 있을 것으로 판단된다.