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NdFe10.7TiM0.3(M = B, Ti)의 Mossbauer 연구
김철성(Chul Sung Kim),이용종(Young Jong Lee),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The authors have studied crystallographic and magnetic properties of NdFe_(10.7)TiM_(0.3)(M = B, Ti) by X-ray diffraction, VSM magnetometer, and Mossbauer spectrometer. The Alloys were prepared by arc-melting under argon atmosphere. The NdFe_(10.7)TiM_(0.3) has pure single phase, whereas the NdFe_(10.7)TiM_(0.3) contains some α-Fe, from powder X-ray diffractometry. The NdFe_(10.7)TiM_(0.3) has the ThMn₁₂-type tetragonal structure with α_0=8.587 A and C_0= 4.788 Å. The Curie temperature (Tc) is 570 ± 3 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 770 K. Each spectrum of below Tc was fitted with five subspectra of Fe sites in the structure (8i₁,8i₂, 8j₁, 8j₂ and 8f). The area fraction of the subspectra at room temperature are 16.4, 8.2, 14.8, 21.3 and 39.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8f)>Hhf(8f).
먹이영양과 물만들기에 따른 붉은쏨뱅이(Sebastiscus tertius) 자어의 성장과 생존
김철원,정달상,Kim, C.W.,Jeong, D.S. 국립한국농수산대학교 교육개발센터 2011 현장농업연구지 = Journal of practical agricultural resear Vol.13 No.1
This study was performed to investigate the effects of food organism and water quality on the mass production of larval red marbled rockfish, Sebastiscus tertius. When rotifer cultured with different food stuffs were supplied to the larvae, rotifer cultured with concentrated Chlorella provided the highest in total length 11.9 mm and survival rate was the highest by 47.0% fed that cultured with ω-yeast Growth and survival rate of larvae fed on enriched rotifer with ω-yeast and super selco, super selco of enriched treatment showed that the best results not only growth but also survival rate. For instance of Artemia, the growth was not significantly different with other treatment but the survival rate was significantly higher than others. The growth of larvae fed with different diets indicated that rotifer+Artemia+commercial diet treatment was the highest on the total length and body weight 18.40 mm and 18.1 mg, respectively, whether the survival rate was rotifer+Artemia treatment was the highest as 57.5%. The most effective density of Chlorella was 10×10<sup>5</sup> cells/ml for growth of larvae. That density showed that total length and body weight were 11.83 mm and 14.3 mg, respectively. The survival rate was the most effective for 20×10<sup>5</sup> cells/ml of Chlorella density. That density represented the highest survival rate as 54.5%. Comparing of PSB adding effect, PSB density 15×10<sup>5</sup> cells/ml was the most effective for growth of larvae and but for survival rate PSB density 10×10<sup>5</sup> cells/ml was the highest as 61.0%.
김철재(C. J. Kim),강용주(Y. J. Kang),최순우(S. U. Choi),허준영(J. Y. Huh) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
To be able to eliminate interferences in a system, it is necessary to isolate the fault and to establish the cause. Since a fault is often the result of several causes, it is essential to be aware of the effects of all potential individual faults. In this way, the individual causes can be investigated specifically and eliminated, whereby it is best to adopt a systematic procedure. Festo educational hydraulic servo system (TP511 Didactic) is globally used. In this study, For the case where this device receives disturbance to minimize the effects of disturbance in position control a state observer is introduced and tested by simulation to verify the usefulness.
Fe 이온이 단사결정 NiCr₂S₄에 미치는 자기적 성질에 관한 연구
김철성(C. S. Kim),고흥문(H. M. Ko),박재윤(J. Y. Park) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Ni_xFe_(1-x)Cr₂S₄ has been studied by Mossbauer and X-ray technique and the crystal structure is found to be monoclinic in the composition range 0.9≤x≤1.0 Mossbauer spectra of Ni_xFe_(1-x)Cr₂S₄ have been taken at various temperatures ranging from 12 K to room temperature. The isomer shift indicates that the charge state of Fe ions is ferrous in character and temperature dependence of isomer shift is in good agreement with theoretical value. Magnetic ordering of antiferromagnetic nature exists below the Neel temperature, T_N=200 K and magnetic hyperfine and quadrupole interactions at 81 K have been studied, yielding the following results : Hhf=156 kOe, ΔE_Q= 2.15 ㎜/s, θ=59˚, Φ=90 0, and η=0.9 for Ni_(0.99)Fe_(0.01)Cr₂S₄. The Neel temperature T_N increases linearly, suggesting that the superexchange interaction for the Ni-S-Cr link is stronger than that for the Fe-S-Cr link.
김철만(C.M. Kim),백종현(J.H. Baek),김영표(Y.P. Kim),김우식(W.S. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Natural gas pipelines are buried in 1.5m depth along the road. Because the rod are curved and the gab between top and bottom is very high in the majority of cases, bend pipes are used. They are classed as hot and cold bend pipe. In case of a very sharp curve road, the hot bend pipes are used such as crossing the river, the road and the railroad. Otherwise, the cold bend pipes are utilized. This research was designed to study the mechanical properties of cold bend pipes in the two types of bend pipes. The curved section(intrados, extrados, neutral) with bending deformation and original body pipe(tangent end) with non-deformation was studied. Cold bending procedure had little effect on thickness variation. The tensile strength and impact energy of the curved section and the tangent end showed somewhat similar results. In this respect of fracture mechanic through CTOD test, the cold bend pipe appeared that it had sufficient integrity.
김철재(C. J. Kim),강용주(Y. J. Kang ),최순우(S. W. Choi),허준영(J. Y. Huh) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.11
In this study, Festo educational hydraulic servo system (TP511 Didactic) widely distributed worldwide was studied for proposing basic data for efficient learning of hydraulic servo system. Characteristics, parameters, modelling, simulation, and experiment of each component of the system were carried out. The parameters of each part were acquired through calculations and experiments based on the information provided by the manufacturer, and the simulation results and experimental results were compared. In addition, the PID optimum gain obtained through the second rule of the Ziegler-Nichols tuning is applied to simulation and experiment, and the results are compared.