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하원,양완석,이지원,김선영 대한수부외과학회 2013 대한수부외과학회지 Vol.18 No.1
Amyloidoma is a solitary tumor characterized by localized deposition of amyloid in the absence of systemic amyloidosis. Soft tissue amyloidoma is rare and occurs most often in the mediastinum and retroperitoneum. Especially, soft tissue amyloidoma of the extremities is exceedingly rare and only 2 cases has been reported in the upper extremity. We report a patient with soft tissue amyloidoma in the upper extremity. 아밀로이드종은 전신성 아밀로이드증 없이 국소적으로 아밀로이드가 침착되어 종괴를 형성하는 것이다. 연부조직 아밀로이드종은 드물게 발생하고 주로 종격동과 후복막에 위치하며, 특히 사지의 연부조직에 발생하는 경우는 극히 드물어현재까지 상지에는 2예만이 보고되고 있다. 저자들은 일반적으로 호발하는 부위가 아닌 상지의 연부조직에 발생한 아밀로이드종으로 진단받은 드문 임상 예를 경험하였기에 보고하는 바이다.
Microstructural control of hot rolled strips and their tensile strengths after hot stamping process
하원,이창훈,박철재 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
The influence of microstructure of hot rolled strips on tensile property after hot stamping was investigated using boron-bearing steel of1470 MPa grade for hot stamping. Hot rolled strips with two kinds of microstructures were produced by mill trial based on a timetemperaturetransformation (TTT) diagram that resulted from a dilatometric experiment. The first had a ferrite-pearlite banded microstructureand the other had a bainitic microstructure. The strip with bainite had a higher tensile strength after hot stamping compared withthe tensile strength of the strip with ferrite-pearlite banded microstructure after hot stamping. The former almost fully transformed tomartensite after hot stamping, while the latter transformed to partial martensite and ferrite that originated from the inhomogeneous hardenabilityof the ferrite-pearlite banded structure due to segregation of alloying elements such as carbon and manganese.