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Seong Mo Koo,Ka Ram Kim,Yong Suk Yang,Hye Sung Kim,Dae Youn Hwang 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
The spark plasma sintering (SPS) method is advantageous for sintering metallic powders due to its ability to produce a sample with fine microstructure without defects and pores even at lower temperature and within a shorter time than that produced by conventional sintering process. It is reported that a degassing treatment prior to sintering by using the SPS method was reported to be a critical step for removing particle-particle boundaries (PBs) effectively. In spite of much research on sintering processes for Mg alloys by using the SPS method, systematic studies on the effect of degassing parameters such as the degree of vacuum, degassing pressure and degassing time, on the microstructural changes and the mechanical properties are lacking. In this study, the microstructural evolution and the mechanical properties of monocrystalline Mg-6% Al alloys were investigated to determine the degassing parameters prior to sintering to remove PBs completely and to obtain a magnesium alloy having high strength and high ductility.
Experience of treatment of patients with granulomatous lobular mastitis
Sung Mo Hur,Dong Hui Cho,Se Kyung Lee,Min-Young Choi,Soo Youn Bae,Min Young Koo,Sangmin Kim,Jun-Ho Choe,Jung-Han Kim,Jee Soo Kim,Seok-Jin Nam,Jung-Hyun Yang,Jeong Eon Lee 대한외과학회 2013 Annals of Surgical Treatment and Research(ASRT) Vol.85 No.1
Purpose: To present the author’s experience with various treatment methods of granulomatous lobular mastitis (GLM) and to determine effective treatment methods of GLM. Methods: Fifty patients who were diagnosed with GLM were classified into five groups based on the initial treatment methods they underwent, which included observation (n = 8), antibiotics (n = 3), steroid (n = 13), drainage (n = 14), and surgical excision (n = 12). The treatment processes in each group were examined and their clinical characteristics, treatment processes, and results were analyzed respectively. Results: Success rates with each initial treatment were observation, 87.5%; antibiotics, 33.3%; steroids, 30.8%; drainage, 28.6%; and surgical excision, 91.7%. In most cases of observation, the lesions were small and the symptoms were mild. A total of 23 patients underwent surgical excision during treatment. Surgical excision showed particularly fast recovery, high success rate (90.3%) and low recurrence rate (8.7%). Conclusion: The clinical course of GLM is complex and the outcome of each treatment type are variable. Surgery may play an important role when a lesion is determined to be mass-forming or appears localized as an abscess pocket during breast examination or imaging study.