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조창민(Chang-Min Cho),임근호(Keun-Ho Lim),정성종(Sung-Chong Chung) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Design is important in the IT, digital appliance, and auto industries. Aesthetic and artistic images have been applied for better quality of the products. 2.5D engraving of glass products is important to fabricate aesthetic patterns in the jewelry industry. Laser and chemical methods have been used to fabricate jewelry. However, heat affection, chemical damage and lack of the 2.5D engraving system have limited the engraving application so far. In this paper, to improve productivity and quality of 2.5D machining on the glass, 2.5D engraving method has been studied through the MBF(Modified Boundary Follower) algorithm and glass machining technique. In addition, to obtain optimum cutting conditions in glass machining for jewelry, micro ball end-milling processes with crack free conditions are studied through Taguchi method. Performance of the developed system is verified through case studies.
조창민(Chang-Min Cho),김승철(Seung-Chul Kim),정성종(Sung-Chong Chung) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
Ripple force deteriorates tracking accuracy and generates oscillation in linear motor driven servos. It has periodic relationship with the position of the translator and the magnets. In this paper, a composite controller composed of the PID and feedforward controllers, and the ripple compensator. To derive an accurate dynamic model of the linear servo, system identification of the linear servo with ripple forces is conducted first. The feedforward control consists of velocity and acceleration compensation terms to improve tracking performance. Harmonic modeling of ripple forces is applied to construct the ripple compensator. After selection of optimal gains of the composite controller, linear and sinusoidal motion commands are applied to verify the tracking performance of the linear servo. Experimental results confirm the effectiveness of the developed control system.
조창민 ( Chang Min Cho ) 대한췌담도학회 2017 대한췌담도학회지 Vol.22 No.3
영상 기기의 발달과 건강검진의 보편화로 무증상 담관 확장을 임상에서 흔히 접하게 되는데, 담관 확장만으로는 정상과 비정상을 구분하기는 어렵다. 담관 확장이 의심되는 환자를 진료할 때, 주의해야 할 것은 영상학적 검사 한 가지만으로 판단해서는 안되며, 동반되는 증상이나 간기능 검사를 포함하여 종합적으로 판단하여 접근하여야 한다. 동일한 담관 직경이 있다고 하더라도 연령, 증상 유무, 담낭절제술 유무에 따라 정상 혹은 비정상일 수 있다. 일반적으로 복부 초음파를 통한 담관의 정상범위는 7-8 mm 미만이며, 조영 검사는 10 mm 미만이나, 고령에서는 각각 10 mm와 12 mm까지도 정상일 수 있다. 복부 초음파에서 담관 확장이 발견되었으나 뚜렷한 원인을 발견할 수 없었던 환자에서 담도성 동통이나 간기능 검사의 이상소견이 동반되어 있을 때는 원인질환을 찾기 위해 적극적인 추가 검사를 하는 것이 필요하다. 반면에, 담낭확장이 우연히 발견되고 증상이나 간기능 검사의 이상소견이 없을 때는 추가 검사를 통해서도 상대적으로 원인질환을 발견할 수 있는 경우가 낮으므로 선택적인 판단이 필요하다. asymptomatic bile duct dilatation was commonly found in clinical practice due to the development of imaging devices and frequent health screening examination, it is sometimes difficult to distinguish between normal and abnormal. In evaluating the cause of bile duct dilatation, comprehensive approach should be accompanied, instead of determining by using any one of imaging modalities. Before diagnosing bile duct dilatation, physiologic changes due to aging and history of biliary operation might be considered. The acceptable range for normal diameter of bile duct is 7-8 mm in transabdominal ultrasonography and less than 10 mm in cholangiography. However, the diameter of bile duct in elderly is acceptable up to 10 mm and 12 mm, respectively. Among patients with incidentally found bile duct dilation, further additional image studies are required to confirm the cause of bile duct dilatation in case of presence of symptom and abnormal liver function test. Meanwhile, the truly asymptomatic patient with normal liver enzyme profiles should be followed closely with clinical and laboratory follow-up to help decide whether any additional imaging would be appropriate.
조창민(Chang-Min Cho),임근호(Keun-Ho Lim),정성종(Sung-Chong Chung) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
Design is important in the IT, digital appliance, and auto industries. Aesthetic and artistic images have been applied for better quality of the products. 2.5D engraving of glass products is important to fabricate aesthetic patterns in the jewelry industry. Laser and chemical methods have been used to fabricate jewelry. However, heat affection, chemical damage and lack of the 2.5D engraving system have limited the engraving application so far. In this paper, to improve productivity and quality of 2.5D machining on the glass, 2.5D engraving method has been studied through the MBF(Modified Boundary Follower) algorithm and glass machining technique. In addition, to obtain optimum cutting conditions in glass machining for jewelry, micro ball end-milling processes with crack free conditions are studied through Taguchi method. Performance of the developed system is verified through case studies.
내시경유두절제술 후 췌장염 예방을 위한 췌관 배액관 삽입
조창민 ( Chang Min Cho ) 대한췌장담도학회 2016 대한췌담도학회지 Vol.21 No.1
Endoscopic papillectomy (EP) has been considered to be a less invasive, alternative therapy to surgery for ampullary adenoma. However, complication rates after EP could not be ignored, when compared to endoscopic resection for gastrointestinal lesions. Among them, the prevalence of postpapillectomy pancreatitis is higher in EP than ERCP. The prophylactic placement of a pancreatic stent has been reported to decrease the risk of pancreatitis after EP. However, since pancreatic stent placement after EP is not always successful, various novel techniques have been developed to ensure reliable stent placement. Despite the recent advances in EP, a prospective, randomized, controlled study with a larger number of patients is needed to assess the efficacy of pancreatic stent placement to prevent pancreatitis.
위아전절제술 후 발생한 역행성 공장 - 위중첩증 1 예
조창민(Chang Min Cho),하승수(Seung Su Ha),박재홍(Jae Hong Park),김태석(Tae Seok Kim),강천일(Chun Il Kang),이현정(Hyun Jung Lee),김현수(Hyun Soo Kim),탁원영(Won Young Tak),권영오(Young Oh Kweon),김성국(Sung Kook Kim),최용환(Yong Hwan 대한소화기학회 2001 대한소화기학회지 Vol.37 No.6
Retrograde jejunogastric intussusception is a segmental invagination of jejunal loop into stomach through stoma. It is a rare complication which can develop after partial gastrectomy, gastroenteroanastomosis, or enteroanastomosis. Clinical manifestations are abdominal pain, vomiting with bile or blood, and palpable mass in epigastric area. It presents considerable difficulties in diagnosis unless the index of suspicion is high. Endoscopy and upper gastrointestinal series are very helpful in the diagnosis of this disease. Although its management is usually surgical, an endoscopic reduction can alternatively be attempted. When anatomical reduction is performed on appropriate time, the prognosis is fairly good. We report a case of retrograde jejunogastric intussusception developed in a 52-year-old man with a brief review of literature. He had received subtotal gastrectomy and gastrojejunostomy for duodenal ulcer perforation 20 years before. (Korean J Gastroenterol 2001;37:466-469)
조창민(Chang-Min Cho),김승철(Seung-Chul Kim),정성종(Sung-Chong Chung) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Ripple force deteriorates tracking accuracy and generates oscillation in linear motor driven servos. It has periodic relationship with the position of the translator and the magnets. In this paper, a composite controller composed of the PID and feedforward controllers, and the ripple compensator. To derive an accurate dynamic model of the linear servo, system identification of the linear servo with ripple forces is conducted first. The feedforward control consists of velocity and acceleration compensation terms to improve tracking performance. Harmonic modeling of ripple forces is applied to construct the ripple compensator. After selection of optimal gains of the composite controller, linear and sinusoidal motion commands are applied to verify the tracking performance of the linear servo. Experimental results confirm the effectiveness of the developed control system.