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폴리머의 레이저 투과접합 시 접합부의 기계적 성질에 관한 연구
차상우,김진범,윤석환,나석주,Cha, Sang-Woo,Kim, Jin-Beom,Yoon, Suk-Hwan,Na, Suck-Joo 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.2
Laser Transmission Joining (LTJ) of plastics is a process in which light of suitable wavelength is transmitted through a transparent substrate that is in contact with an absorbing one. In this paper, LTJ is investigated by preliminary experiments from the viewpoint of mechanical engineering. To understand transmitting characteristics of each polymer substrate, transmission rate, reflection rate and absorption coefficient of polymer are measured by using a laser power-meter. Characteristics of joining in the spot welding and seam welding are investigated by measuring the fracture load. Fracture load increases in accordance to the laser power and irradiation time. However, when the laser power is over 60W and irradiation time over 4seconds, fracture load decreases. This phenomenon is probably due to heat-softening of materials. Besides, cavities are generated at a joint by evaporation of water molecules, which can be suppressed by introduction of a gap between two substrates.
차상우,김광주 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
This study was conducted to confirm various results obtained through cooling crystallization of HMX in a binary solvent of propylene carbonate and water. HMX is term derived from High Molecula-weight rdX and is widely used industrially. The solvent chosen for the HMX manufacturing process is a two-component solvent of PC and water. The binary solvent of PC and water was mainly composed of 80% PC and 90% PC. In addition, the initial concentration was determined according to the mass fraction of PC in the binary solvent of PC and water. The cooling crystallization of the HMX was controlled by controlling the degree of supersaturation, the driving force of crystallization. The recrystallized HMX crystals are in β-form. The recrystallized crystals were analyzed by SEM and optical microscope.
분할췌장을 동반하지 않은 바터씨 팽대부 종양에서 관찰된 산토리니류 1예
차상우,이문성 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Santorinicele has been used to describe a focal dilatation of the terminal portion of the dorsal pancreatic duct at the minor papilla. The prevalence of this rare anomaly is unknown, and it is unclear whether it is congenital in origin or an acquired lesion secondary to stenosis of the dorsal duct orifice. Because most of all cases reported to date have been associated with pancreatic divisum, it has been assumed that santorinicele is related to the obstruction of pancreatic outflow and resultant pancreatitis that occurs in pancreatic divisum. A case of asntorinicele in a patient with ampulla of Vater cancer without pancreatic divisum is presented.
Recent advances of diagnostic approaches for indeterminate biliary tract obstruction
차상우 소화기인터벤션의학회 2021 Gastrointestinal Intervention Vol.10 No.3
Patients with indeterminate biliary stricture frequently pose a challenge in the clinical management. Discrimination between benign and malignant biliary strictures is important to prevent the morbidity and mortality associated with incorrect diagnoses. Traditional tissue sampling using endoscopic retrograde cholangiography does not always produce a definitive diagnosis, with a considerable proportion of cases remaining as indeterminate biliary strictures. Recent advances in endoscopic and molecular techniques have the potential to improve the diagnostic and prognostic accuracy of biliary strictures. This article reviews various etiologies of biliary strictures and discusses the recent advances of diagnostic approaches for indeterminate biliary tract obstruction.