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직접 에너지 적층 공정을 이용한 보수 공정에서 보수 폭에 따른 기계적 특성 관찰
오욱진(Wook-Jin Oh),신광용(Gwang-Yong Shin),손용(Yong Son),심도식(Do-Sik Shim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.3
This study explores the effects of repair width on the deposition characteristics and mechanical properties of stainless steel samples repaired using direct energy deposition (DED). In the DED repair process, defects such as pores and cracks can occur at the interface between the substrate and deposited material. In this study, we changed the width of the pre-machined zone for repair in order to prevent cracks from occurring at the inclined surface. As a result of the experiment, cracks of 10–40 μm in length were formed along the inclined slope regardless of the repair width. Yield and tensile strength decreased slightly as the repair width increased, but the total and uniform elongation increased. This is due to the orientation of the crack. For specimens with a repair width of 20 mm, yield and tensile strength were 883 MPa and 1135 MPa, respectively. Total and uniform elongations were 14.3% and 8.2%, respectively. During observation of the fracture specimens, we noted that the fracture of the specimen with an 8 mm repair width occurred along the slope, whereas specimens with 14 mm and 20 mm repair depths fractured at the middle of the repaired region. In conclusion, we found that tensile properties were dependent upon the repair width and the inclination of the crack occurred at the interface.
송동호(Dong-Ho Song),하은혜(Eun-Hye Ha),오욱진(Wook-Jin Oh),고광범(Kwang-Bum Ko),류영민(Young-Min Lew) 대한소아청소년정신의학회 2008 소아청소년정신의학 Vol.19 No.3
Objectives: This study aimed to evaluate preliminarily the clinical effects of cognitive-behavioral treatment in children with anxiety disorders. Methods: Subjects were 11 children between 2nd and 6th grade with anxiety disorder. All subjects were diagnosed through Kiddie-Schedule for Affective Disorder and Schizophrenia Present and Lifetime Version (K-SADS-PL) interview. The CBT program consisted of sessions once a week (60min/session) for 14 weeks with parent education. Results: Children and parents reported significantly improved social skills, social competence and decreased anxiety. However, there were no significant changes in childrens negative thoughts and subjective depressive symptoms. Conclusion: Cognitive-behavioral treatment is expected to be effective in children with anxiety disorders such as generalized anxiety disorder, phobia, separation anxiety disorder, and obsessive-compulsive disorder.