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급속 응고된 Fe-Mn-Si계 합금 리본의 γ→ε 마르텐사이트변태 특성에 미치는 냉각속도 및 어닐링 온도의 영향
은상원,조무현,장우양 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2
Effects of colling rate and heat treatment on the microstructure and grain size have been investigated in Fe-Mn-Si based SMA Ribbons, and the correlationship between those intrinsic factors and martensitic transformation charactehstics has been discussed. When Fe-Mn-Si based SMA ribbons were fabricated by RSP, grain size of the ribbon was refined up to 4 ㎛ and the uniformity of grains were improved by increasing wheel speed i.e cooling rate. The volume fraction of thermal ε martensite was increased by increasing colling rate. Refined grains of the melt-spin ribbon were partially grown by annealing above 300℃×3min. By increasing annealing temperature, the volume fraction of thermal e martensite was increased and that of α' martensite were also highly increased in the resultant ribbons. Ms temperature of annealed ribbon was higher than that of as-spun ribbon and transformation temperature hysteresis(A_(f-)M_(s)) was decreased by increasing annealing temperature.
김인철,은희봉,장민식 한국항공운항학회 1999 한국항공운항학회지 Vol.7 No.1
The air transportation industry in Korea has grown very fast in aspect of the transportation scale as much as entering within the tenth in the world. However, as compared with the air transportation industry, the civil aviation pilots training has been performed at very low level in quantity and quality because of the high cost of pilots training, nation security, limited airspace use and falling behind of the science technology in relation to the aviation industry. In result, the number of airline pilots became lower than actual demands of both airlines, KAL and ASIANA. This produced many foreign captains employed, airline pilots overloaded and finally affected flight safety. In this paper, it was studied the actual reality and problems of civil aviation pilots training and presented the encouraging policies for civil aviation pilots training in Korea.
이경하,정태명,은유진,김기현,임채호 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
인터넷의 역기능 현상으로부터 시스템을 보호하고 소요한 정보를 지키려는 노력은 다양한 보안 시스템의 개발로 이어졌다. 보안 시스템은 시스템을 기반으로 한 것과 네트워크를 기반으로 한 것으로 나눌 수 있는데, 본 논문에서는 네트워크 기반의 보안 시스템을 설계하였고, 설계된 시스템으로부터 가능한 침입탐지 기술들을 언급하고 있다.
Cu-Al-Ni계 초탄성 합금의 변태특성 및 변형거동에 미치는 미세조직의 영향
박정수,김경훈,은상원,조무현,장우양,양권승,강조원 조선대학교 생산기술연구소 2004 生産技術硏究 Vol.26 No.2
The effect of microstructure on transformation characteristics and deformation behavior in Cu-Al-Ni based superelastic alloy has been studied in alloy by using metallography, calorimetry, compression test and XRD. When the alloy betatized at the elevated temperature above 600℃, the r₂ phase completely dissolved into the matrix. The β₁' or r₁' martensites from β₁ patent phase was transformed in as-cast state but the parent phase stabilized by betatizing at 600℃. With increasing betatizing temperatures above 600℃. both₁' and r₁' martensites again transformed from β₁ parent phase and the heat flow of r₁' martensite was higher than that of β₁' martensite for reverse transformation. The compressed specimen, showing pseudoelastic behavior, was completely recovered upon unloading. However, the stress-strain curves for compression test were different by betatizing temperature; the stress-strain curves of the specimen betatized at 600℃ and 700℃ were linear but those of the specimen betatized at 800℃ and 900℃ were non-linear. The r₁' martensite was retained after compression test and the volume fraction of that increased with increasing betatizing temperature and strain.
Y.K. Oh,J.S. Eun,S.C. Lee,G.M. Chu,이성실,문여황 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.2
This study was carried out to investigate the effects of intraruminal infusion of propionate on ruminal fermentation characteristics and blood hormones and metabolites in Hanwoo (Korean cattle) steers. Four Hanwoo steers (average body wt. 270 kg, 13 month of age) equipped with rumen cannula were infused into rumens with 0.0 M (Water, C), 0.5 M (37 g/L, T1), 1.0 M (74 g/L, T2) and 1.5 M (111 g/L, T3) of propionate for 1 hour per day and allotted by 4×4 Latin square design. On the 5th day of infusion, samples of rumen and blood were collected at 0, 60, 120, 180, and 300 min after intraruminal infusion of propionate. The concentrations of serum glucose and plasma glucagon were not affected (p>0.05) by intraruminal infusion of propionate. The serum insulin concentration at 60 min after infusion was significantly (p<0.05) higher in T3 than in C, while the concentration of non-esterified fatty acid (NEFA) at 60 and 180 min after infusion was significantly (p<0.05) lower in the propionate treatments than in C. Hence, intraruminal infusion of propionate stimulates the secretion of insulin, and decreases serum NEFA concentration rather than the change of serum glucose concentration.