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안장호(Jangho Ahn),이인혁(Inhyeok Lee),최형연(Hyung Yun Choi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This is one of the efforts to make a virtual model of lithium polymer battery for EV which can represent its mechanical characteristics. The prediction of fatigue life and crack propagation in welding parts of pouch cell type lithium polymer battery is the main focus of this paper. The series spot welding between different materials (Cu-Al) and between same materials (Cu-Cu) is virtually processed using a finite element method. In order to model the softening formation in melting and heat affected zone, material properties from heat treated coupons were measured and applied to the phase change model in the SYSWELD program. The spot welding wizard module which supports a full coupling computation between Electro-Thermo-Metallurgical-Mechanical processes is modified and used to construct a modeling of series spot welding. The simulation result is validated against the metallography of welding specimen.
안장호(An JangHo),이주호(Lee JooHo),이준서(Lee JunSeo),김일민(Kim IlMin) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
In downtown, construction noise related claims are the most important issues. Sometimes noise related claims halt the construction process. Therefore, Introduction of noise reduction measures is common to construction process with a loud noise. This case is about concrete pouring for mat foundation of super tall building. Concrete pouring process using High Pressure Pumping machine causes high noise level in the vicinity of area. And large number of transit-mixer truck cause traffic congestion. This paper introduces effort and process to prevention of construction noise claims on massive scale concrete pouring.
안장호(JangHo An),김경호(KyungHo Kim),이준서(JunSeo Lee),김성훈(SeongHoon Kim) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
In dry wall, noise is passed through gypsum board and stud. Noise makes gypsum board vibration. Then, the vibration passes through stud and gypsum board as resonation. And radiation as noise form surface of gypsum board into adjacent room. At this moment, according to thickness, placement and cross-section of stud, noise transmission ratio changes. Thicker stud has better sound insulation performance. Studs are apart from each other, has better sound insulation performance. But, single stud structure has restriction of thickness and arrange of studs. In this article, Sound insulation performance varies depending on the shape of the studs were studied.
안장호(Jang Ho Ahn),이도성(Do Seong Lee),박기석(Ki Suk Park),정승영(Seung Young Chung),박문선(Moon Sun Park),김승민(Seong Min Kim) 대한두개저학회 2016 대한두개저학회지 Vol.11 No.2
Chondroblastoma is a rare, benign primary bone tumor that typically develops the epiphyses of long bones. Chondroblastoma of the skull is very rare and it had been reported that the most cases of the skull occurred in the squamous portion of the temporal bone. We reported the very rare case of chondroblastoma of the sphenoid sinus presenting right sided optic neuropathy that was treated with endoscopic surgery, followed by open craniotomy and tumor removal.