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유승한(Seung-Han You),조준상(Joon-Sang Jo),유승진(Seungjin Yoo),한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper deals with the design of a feedback yaw rate controller based on gain-scheduled H∞ optimal control, which enables the reduction of sideslip as well as the prevention of vehicle rollover. The uncertain factors such as vehicle mass and cornering stiffness in the vehicle yaw rate dynamics naturally call for the robustness of the feedback controller, which leads to the application of H." optimization technique to synthesize a controller with guaranteed robust stability and performance against the model uncertainty. The lumped disturbance due to the parametric uncertainties is estimated using the disturbance observer to assess the correct value of the compensating yaw moment. The braking force distribution for generating artificial yaw moment is implemented by effective actuation of braking wheels. Simulation results indicate that the proposed gain-scheduled H∞ optimal yaw rate controller can decently improve the lateral stability of an automobile.
유승한(Seung-Han You),유승진(Seungjin Yoo),한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper presents new approaches to identify vehicle lateral velocity and road-bank angle in real-time. The main challenge in the identification of lateral velocity and road-bank angle is that they are lumped together with the disturbance induced by system parametric uncertainties such as variations of vehicle mass and cornering stiffness of tires. This paper develops two estimation algorithms using the parameterized model for the identification of parametric uncertainties, which enables the real-time estimation of vehicle lateral velocity and road-bank angle via algebraic formulation. The decent performance of the proposed estimation methods is verified using simulation results on CARSIM, proving their practicability in real-world applications.
강현종(Hyunjong Kang),조항주(Hang Joo Cho),김기환(Kee Whan Kim),김지일(Jiil Kim),김정수(Jeong Soo Kim),유승진(Seung Jin You),임근우(Keunwoo Lim),이은정(Eunjeong Lee),안창혁(Changhyeok An) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.2
The rare cause of lower gastrointestinal bleeding is angiodysplasia. Angiolysplasia is most common in the right colon, but it can be found throughout the whole gastrointestinal tract. The main lesion of angiodysplasia is located at the submucosal layer. So, it is sometimes very difficult to search for the focus of bleeding via laparotomy or colonoscopy. We recently experienced a case of rectal arteriovenous malformation that was misdiagnosed as intussusception. A 57-year-old man visited the emergency room because of abrupt anal bleeding and low abdominal pain, and this was the third episode he’d experienced during the past 20 years. Sigmoidoscopy and abdominal CT revealed that his rectum was obstructed with a dark black colotuberant mass, which was suggestive of ischemic intussusception. We performed emergency laparotomy and we found an extremely swollen rectum with surrounding hematoma instead of intussusception. We performed low anterior resection and colo-anal anastomosis with ileostomy. The final pathologic diagnosis showed that the protuberant mass was a hematoma in the submucosal layer, and this developed by bleeding from an arteriovenous malformation in the rectum.
위아전절제술 후 발생한 위공장결장루(Gastrojejunocolic Fistula)
김신선(Sin Sun Kim),김기환(Kee Hwan Kim),김지일(Ji Il Kim),안창혁(Chang Hyeok An),김정수(Jeong Soo Kim),유승진(Seung Jin You),임근우(Keun Woo Lim),채현석(Hiun Suk Chae),구영미(Young Mi Ku),장은덕(Eun Deok Chang) 대한외과학회 2006 Annals of Surgical Treatment and Research(ASRT) Vol.71 No.3