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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.
요인배치법과 라틴방격법을 통한 건물 냉난방 부하 예측의 정확도 비교연구
최연희(Youn Hee Choi),구준모(June Mo Koo),송두삼(Doo Sam Song) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
본 연구의 본래 목적은 건물의 냉/난방 부하의 최적 예측의 정확도 향상에 있다. 따라서 본 연구에서는 일반적으로 많이 활용되는 실험계획법의 디자인 방법의 모델 정립 특성, 정확도 비교, 요인별 영향도 분석을 통해 요인배치법의 한계를 정의한다. 요인배치법과 비교하여 라틴방격법의 경우, 보다 정확한 건물의 냉난방 부하, 계산의 경제성과 더불어 모델의 비선형적인 특성을 고려할 수 있는 것을 분석할 수 있었다. 이는 실제 조건에서 인자들의 수준이 요인배치법과 같은 상한, 하한 레벨에 해당되기 보다 세밀하고 복잡한 조건에 해당한다. 시뮬레이션 및 분석을 통한 연구결과, 요인배치법의 경우, 실제 냉난방부하의 예측 및 샘플링수에 대한 오차의 의존성이 높다. 반면에 라틴방격법을 통한 연간 냉난방 부하의 예측의 정확도 및 비선형적인 요소의 고려는 요인배치법에 비해 월등한 것으로 나타났다. 따라서 실제 부하의 예측 등 건물 분야에서 라틴방격법의 활용이 보다 적합할 것으로 보인다.
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.