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강자성체 박막(Co-Ni)의 자기-저항효과에 관한 연구(2)
손대락,장충근,유중렬,남선우 한국센서학회 1994 센서학회지 Vol.3 No.1
Grid type 70Ni-30Co thin films on slide glass at 250℃ has been fabricated to develope. From fabricated sensors using above process, we investigated the relation of temperature, resistivity, line width to magnetoresistance and we obtained the following results after observation of coercive force, saturated magnetization, maxium usable sensitivity, duty time, slew rate, white noise, resolution of the sensors. We confirmed that the 600Å thin film at 250℃ formed crystalized magnetic anisotropy spontanernisly and the sensor using the thin film had capability of detecting magnetic field with sensitivity of 230 nT. In these devices, the magnetoresistance change was increased linearly in ±10 Oe range, and the magnetoresistance effect was increased when the ratio between line width and length was increased. When the devices was soldered using indium, the temperature-resistivity coefficient showed 8 X 10^(-3)/deg and increased during the specific properties as magnetic field sensor were weakened. In this studies, the coercive forces of the films were about 5.1 A/cm and saturated magnetizations were 0.64 T, and the delay time in these devises was 5 ㎲ and slew rate showed 0.39 Oe/us and white noise was -120 dB.
이성호,김광락,안도희,유재형,백승우,손종식,임성팔,정홍석 한국공업화학회 2001 응용화학 Vol.5 No.2
Hydrogen absorption experiments were carried out by the titanium(Ti) sponge for investigating the characteristics of hydrogen absorption. From experimental results, Ti sponges showed the high hydrogen absorption capacity inspite of low reaction temperature. The H/M which mean the capacity of hydrogen absorption was measured 2.0 for Ti sponge in the experimental condition of 25℃. The effects of the reaction temperature, activation conditions, and the presence of helium in the hydrogen were investigated.
SHON, YUN-HEE,KIM, SO-YEUN,LEE, JAE-SUNG,LIM, JONG-KOOK,NAM, KYUNG-SOO 한국미생물 · 생명공학회 2001 Journal of microbiology and biotechnology Vol.11 No.2
The antimutagenic activity of polysaccharides extracted from soybeans fermented with Agrocybe cylindracea (AC) or Phellinus igniarius (PI) against 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx) was examined using a Salmonella/Ames test and host-mediated assay in mice. The polysaccharides from the soybeans fermented with A. cylindracea and P. igniarius inhibited the mutagenic activity of the cooked food mutagen, MeIQx, by 31.2% and 35.3%, respectively. The polysaccharides also inhibited MeIQx genotoxicity in a dose-dependent manner in mice. These results suggest that the polysaccharides from soybeans fermented with A. cylindracea or P. igniarius exhibit antimutagenic properties against MeIQx in vitro and in vivo.
Minimum Weight Design of Sinusoidal Corrugated Web Beam Using Real-Coded Genetic Algorithms
Shon, Sudeok,Jin, Sangwook,Lee, Seungjae Hindawi Limited 2017 Mathematical problems in engineering Vol.2017 No.-
<P>Fundamental advantage of using corrugated web girder rather than plate girder reinforced with stiffeners is securing stability against shear buckling of web and unnecessary stiffeners despite the thinner web. Nonetheless, because shear buckling behavior of corrugated web is very complex, the design mechanism for beams and local, global, and interactive buckling problems should be considered in designing of its structural optimization for better economics and reasonableness. Therefore, this paper proposes a mathematical model for minimum weight design of sinusoidal web girder for securing better stability with smooth corrugation and aims at developing its optimum design program. The constraints for the optimum design were composed on the basis of the standards of EN 1993-1-5, DASt-R015, and DIN 18800, and the optimum program was coded in accordance with the standards based on Real-Coded Genetic Algorithms. The genetic operators for the developed program resulted in a stable solution with crossover probability between 12.5 and 50%, and the perturbation vector for outbreeding could obtain the best result with the model being applied of feasible design variable space of 20–30%. Additionally, the increase of yield strength resulted in decreased value of the objective function, and it was found through the change of the value of the constraint function that the thickness of web was an important factor in the optimum structural design.</P>