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윤재익,정효숙,박기용,주문배 대한신경외과학회 1986 Journal of Korean neurosurgical society Vol.15 No.4
A case of traumatic thoracolumbar epidural hemorrhage is presented in a 37-year-old man with ankylosing spondylitis. The patient complained neck and back pain right after the accident but paralegia and difficult urination followed 2 days later. Spine CT showed thoracolumbar epidural mass, which was confirmed to be hemorrhage associated with spine fracture and was solely responsible for paraplegia.
분말야금법으로 제조한 하모닉 구조재료의 신장플랜지 가공성
윤재익,이학현,박형근,김형섭,Yoon, Jae Ik,Lee, Hak Hyeon,Park, Hyung Keun,Ameyama, Kei,Kim, Hyoung Seop 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.2
Harmonic structure materials are materials with a core-shell structure having a shell with a small grain size and a core with a relatively large grain size. They are in the spotlight because their mechanical properties reportedly feature strength similar to that of a sintered powder with a fine grain size and elongation similar to that of a sintered powder with a coarse grain size at the same time. In this study, the tensile properties, microstructure, and stretch-flangeability of harmonic structure SUS304L made using powder metallurgy are investigated to check its suitability for automotive applications. The harmonic powders are made by mechanical milling and sintered using a spark plasma sintering method at 1173 K and a pressure of 50 MPa in a cylindrical die. The sintered powders of SUS304L having harmonic structure (harmonic SUS304L) exhibit excellent tensile properties compared with sintered powders of SUS304L having homogeneous microstructure. In addition, the harmonic SUS304L has excellent stretch-flangeability compared with commercial advanced high-strength steels (AHSSs) at a similar strength grade. Thus, the harmonic SUS304L is more suitable for automotive applications than conventional AHSSs because it exhibits both excellent tensile properties and stretch-flangeability.
윤재익,정효숙,박기용,주문배 대한신경외과학회 1987 Journal of Korean neurosurgical society Vol.16 No.3
Candidosis, the most common fungal infection involving the central nervous system, is rarely diagnosed during life. The authors present a case of candidal granuloma of the caudate area in a 31- year-old, otherwise healthy man with episode of intermittent antibiotic therapy. There was no extracranial fungal lesions. Ventriculoperitoneal shunt and biopsy followed by treatment with Amphotericin-B resulted in a favorable outcome.
Effect of Target-Fixture Geometry on Shock-Wave Compacted Copper Powders
김우열,안동현,윤재익,박이주,김형섭 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
In shock compaction with a single gas gun system, a target fixture is used to safely recover a powder compact processedby shock-wave dynamic impact. However, no standard fixture geometry exists, and its effect on the processedcompact is not well studied. In this study, two types of fixture are used for the dynamic compaction ofhydrogen-reduced copper powders, and the mechanical properties and microstructures are investigated using theVickers microhardness test and electron backscatter diffraction, respectively. With the assistance of finite elementmethod simulations, we analyze several shock parameters that are experimentally hard to control. The results ofthe simulations indicate that the target geometry clearly affects the characteristics of incident and reflected shockwaves. The hardness distribution and the microstructure of the compacts also show their dependence on the geometry. With the results of the simulations and the experiment, it is concluded that the target geometry affects theshock wave propagation and wave interaction in the specimen.