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상완골 근위부 골절 치료에서 잠김 압박 금속판의 유용성
김동휘,이준영,조승환,양훈,하상호 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.34 No.1
Purpose: To prove the efficacy of locking compression plate (LCP) in proximal humerus fracture. Materials and Methods: Forty four out of 48 patients who had proximal humerus fracture operation with LCP from November, 2004 to June, 2008 and available for follow up for more than 6 months were evaluated. Eighteen cases were male and 26 cases were female with mean age of 56 years (range 29-85 years). Cause of injury was traffic accident in 17 cases, slip down in 20 cases and fall down in 7 cases. Mean interval from injury to operation was 6.8 days (range 2-30 days) and mean operation time was 80. 5 minutes(range 40-130 minutes). Open reduction and internal fixation with LCP using deltopectoral approach was used in all cases. Postoperative clinical evaluation was done using Constant-Murley assessment and bone union and neck-shaft angle was checked using radiographic exam. Results: Bone union was achieved in 41 out of 44 cases at mean interval of 11.2 weeks(range 6-16 weeks). Mean neck-shaft angle was 129.7 degree (range 101-146) with more than 20 degree of angular deformation in 2 cases. For the complication, 2 cases of temporary axillary nerve injury, 1 case of nonunion, 2 case of delayed unions with angulation, 2 case of ankylosis was observed. Conclusion: LCP can prevent reduction loss and minimize soft tissue injury which result in firm fixation and early immobilization. It seem to be very efficient in treating proximal humerus fracture in elderly.
Evolution of Al Alloy Melt Foam Pore Structure in Foaming Process
Yang, Dong Hui,Seo, Chang Hwan,Yao, Da Peng,Hur, Bo Young Trans Tech Publications, Ltd. 2007 Materials science forum Vol.544 No.-
<P>A study was carried out to understand the relationship between the pore structure’s evolution of Al alloy melt foam and its preparation variables, which include decomposition properties of titanium hydride, the stirring foaming time and the holding foaming time. The results show that the foaming process of Al alloy melt can be inferred by the relation curves of decomposition quantity of titanium hydride and time at a specific temperature. The porosity of Al alloy melt during stirring foaming period is kept constant while the pore number increases and pore diameter decreases, which is a new method of fabricating Al alloy foam with a relatively low porosity and small pore size.</P>
Effects of Sn Addition on the Microstructure and Magnetic Properties of MnBi Bulk Magnets
Yang Yang,Jung Tae Lim,Jihoon Park,Hui-Dong Qian,Oi Lun Li,Jong-Woo Kim,Chul-Jin Choi 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Rare-earth free permanent magnets are current emerging issues of industry for the growing market demands. Among the rare-earth free permanent magnets, MnBi has attracted attention for large magneto crystalline anisotropy constant (K1 ≈ 1.6 MJ/m<sup>3</sup>, at 300 K) [1] and unique positive temperature coefficient of coercivity (H<sub>c</sub>) [2]. The low-temperature phase (LTP) of MnBi exhibits a saturation magnetization (M<sub>s</sub>) of 80 emu/g, and the theoretical maximum energy product (BH)<sub>max</sub> 17.7 MGOe at room temperature [3]. However, it is a challenge to fabricate MnBi bulk magnets while maintaining the superior magnetic properties of the powder, especially to prevent the reduction of H<sub>c</sub> from powder to bulk. The effects of Sn adding on the microstructure and magnetic properties of MnBi bulk magnets have been systematically investigated. As kwon, the pure MnBi bulk magnets are challenging to reach high H<sub>c</sub> in previous studies, and a few reference works have been reported about research on fabrication of high H<sub>c</sub> MnBi bulks by adding the third element. It was found that the Sn-added MnBi bulk magnets show the increased H<sub>c</sub> and the improved squareness, apparently related to restructuring the intergranular phase due to Sn element addition. The H<sub>c</sub> of MnBi bulk magnet with 3 wt.% Sn reaches 11.6 kOe, which is 35 % higher than that of the pure MnBi magnet. In the sample of 1 wt.% Sn added MnBi bulk magnet, the H<sub>c</sub> was elevated to 10.0 kOe, and the maximum energy product (BH)<sub>max</sub> was recorded of 7.84 MGOe at room temperature. This makes Sn added MnBi bulk magnet a promising candidate for next-generation rare-earth-free bulk magnets.
A performance-based design method for chloride-induced cover cracking of RC structures
Dong-Hui Yang,Ting-Hua Yi,Hong-Nan Li 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.5
Chloride-induced cover cracking will aggravate the performance deterioration for RC structures under the chloride-laden environment, which may endanger the safety of structures and occupants. Traditional design method cannot ensure that a definite performance is satisfied. To overcome the defects, a study on the performance-based design method was carried out in this paper. Firstly, the limit state functions were established for the corrosion initiation and cover cracking. Thereafter, the uncertainty analysis was performed to study the effects of random factors on the time-dependent performances. Partial factor formulae were deduced through the first-order reliability method for performance verification. Finally, an illustrative example was presented and the sensitivity of cover depth to other parameters was carried out. It is found that the uncertainties of the random variables have great effects on the required cover depth. It is demonstrated that the performance-based design method can ensure that the target performance can be satisfied and support to formulate a rational maintenance and repair strategy for RC structures under the chloride environment.