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온도에 따른 비정질 금속 Co66Fe₄Ni₁B₁₄Si15의 자기 임피던스 효과
김용국(Y. K. Kim),김택기(T. K. Kim),김성일(S. I. Kim),이희복(Heebok Lee) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.1
The temperature dependence of the magnetoimpedance (MI) effect is important both for scientific study and for thermal stability of MI sensors. We have performed the measurement of MI effect in amorphous Co_(66)Fe₄Ni₁B₁₄Si_(15) (Metglas 2714A) ribbon from a cryogenic chamber where the temperature of the sample can vary from 10 K to 300 K. The ac current was fixed at 10 ㎃ for all measured frequencies ranging from 100 ㎑ to 10 ㎒.<br/> The magnetoimpedance ratio (MIR) was revealed the drastic increment as a function of MIR (T) = MIR (0) exp(cT²) where c is a constant. The measured MIR values at room temperature are usually 2-3 times larger than the data measured at 10 K for all measured frequencies. However, the shapes of the MIR curves are remained. This result shows the potential application of the MI effect for a temperature sensor. The frequency dependence of MIR has shown the typical tendency where the maximum values of MIR are increasing and also the shapes of MIR curves are getting broader as the measured frequency increases.
김용국 ( Y K Kim ),이수기 ( S K Lee ) 한국축산학회 1995 한국축산학회지 Vol.37 No.6
Six lactating Holstein dairy cows which were producing about 20 ㎏ milk per day were assigned in a swich back design to the diets without (control) or with fungal additive (treatment). All cows (n=6) were fed concentrate mix, soybean meal, com silage, alfafa hay and rice straw without or with fungal additive. Treatment cows produced 20.5 ㎏ milk daily, while control cows produced 18.9 ㎏. Milk fat and protein percentages were 3.SS and 3.51% for control cows and 3.94 and 3.66% for treatment cows. The molar concentration of ruminal acetate, propionate, and butyrate, and acetate to propionate ratio were similar between control and treatment cows. However, ruminal pH tended to be higher for treatment cows (7.1) than control cows (6.8), whereas ruminal ammonia concentration (㎎/㎗) was lower for treatment cows (15.3) than control cows (12.7). Dry matter intakes were 17.4 ㎏/d for control cows and 17.6 ㎏/d for treatment cows. Dry matter digestibility tended to be higher for treatment cows (71.8%) than for control cows (70.0%). The results indicate that the lactational responce of dairy cows may to be improved by feeding fungal additive which was produced from Fonaitella fraxinea.
한국 야생 멧토끼 ( Lepus sinensis coreanus ) 의 건물 섭취량과 소화율
김용국(Y . K . Kim),김용인(Y . I . Kim) 한국축산학회 1993 한국축산학회지 Vol.35 No.5
Body weights, dry matter intakes, and dry matter digestibilities by wild Korean mountain hares were determined. Four haves (two pairs) were assigned to the diets containing sweet potato + kudzu vine (Diet 1) and sweet potato + soybeans + kudzu vine (Diet 2). Body weight of males were 1,548 g for Diet t and L,528 g for Diet 2, and those of females were 1,419 g for Diet 1 and 1,408 g for Diet 2. Daily dry matter intakes by males were L20.7 g for Diet I and 108.3 g for Diet 2 (P$lt;.01), and those by females were 109.9 g for Diet 1 and 92.4 g for Diet 2 (P$lt;.01). Dry matter digestibilities by males were 66.2% for Diet 1 and 68.1% for Diet 2 (P$lt;.01), and those by females were 72.9% for Diet 1 and 77.4% for Diet 2 (P$lt;.01).