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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.
김철원,정달상,최성제,강한승,Kim, C.W.,Jeong, D.S.,Choi, S.J.,Kang, H.S. 국립한국농수산대학교 교육개발센터 2021 현장농업연구지 = Journal of practical agricultural resear Vol.23 No.2
왕우럭조개 양식산업화를 위해서는 왕우럭조개 서식지의 해양환경에 관한 기초자료 확보가 중요하다. 본 연구는 왕우럭조개 서식지 해양환경을 조사하여 인공종자생산을 위한 왕우럭조개 모패의 준비에 대한 기초자료를 확보하고자 하였다. 왕우럭조개 서식지의 수온은 겨울철에 가장 낮았으며, 여름철에 높게 나타났다. 염분은 31.2 ~ 33.9 psu로 조사시기에 따라 큰 차이가 없었다. pH는 7.69 ~ 8.70으로 겨울철에 높고, 여름철에 낮았다. 용존산소는 6.20 ~ 10.24 mg/L의 범위로 가을철이 봄철 및 겨울철에 비해 상대적으로 높게 나타났다. 식물 플랑크톤의 종 조성은 계절에 따라 약 30 ~ 40종 정도로 규조류가 대부분이었다. 계절별 식물플랑크톤 현존량은 23.5 ~ 61.3 cells/ml로 계절마다 차이를 보였다. 또한 우점종의 출현도 계절마다 차이를 보였다. 퇴적물 입도 조성은 모래 실트(sandy silt)이었다. 조류의 유향과 유속은 낙조시 남동방향으로 50 ~ 80 cm/s 나타났으며 창조시에는 북서방향으로 60 ~ 100 cm/s로 나타났다. 본 연구의 결과는 왕우럭조개의 서식지 해양환경에 대한 지식의 제공 및 잠입 서식하는 패류의 연구에 기초자료로 활용이 가능하다 사료된다. For the aquaculture industrialization of surf clam (Tresus keenae), it is important to basic data on the marine environment of the habitat of surf clam (T. keenae). In this study, we investigated the marine environment of habitat of surf clam (T. keenae) and sought to basic data for the preparation of surf clam (T. keenae) for artificial seed production. The water temperature of the habitat of surf clam (T. keenae) was the lowest in winter and appeared high in summer. The salt concentration showed it range from 31.2 to 33.9 psu. The pH showed it range from 7.69 to 8.70, with high pH in winter and low pH in summer. The dissolved oxygen(DO) was showed it range from 6.20 to 10.24 mg / L and the autumn was relatively higher than the spring and winter. The species composition of phytoplankton was about 30 to 40 species, and most of them were diatoms. The abundance of seasonal phytoplankton showed it range from 23.5 to 61.3 cells / ml, showing seasonal differences. The expression of dominant species also showed a difference depending on the season. As for the particle size composition of the sediment, sandy silt was the most distributed. Flow velocities appeared at 50-80 cm / s in the southeast direction at ebb tide and at 60-100 cm / s in the northwest direction at flood tide. The results of this study can be used as basic data for providing knowledge about the habitat and marine environment of surf clam (T. keenae) and for studying shellfish that inhabit the sedimentary layer.
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.
김철(C Kim),위성년(SN Wee),문은주(EJ Moon),이학림(HL Lee),임수현(SH Lim),이세용(SY Lee) 대한산부인과학회 1991 Obstetrics & Gynecology Science Vol.34 No.2
Clinical analysis was carried out retrospectively, based on the charts of 1801 cases of cesarean section out of 10,162 deliveries from January, 1983 to December 1988 at the St.Benedict hospital, Busan, Korea. The results were as follows. 1. There were 10,162 deliveries with 1801 cases of Cesarean section, giving an incidence of 17.7%, The primary Cesarean section rate was 11.4% and repeat Cesarean section rate was 3.3%. 2. According to the age distribution 63.7% of total cases were between 26~30 year old group, 21.4% between 21~25 year old group and 18.4% between 31~35 year old group. The mean age was 27.7 year old. 3. The greatest portion(55.4%) of the cases was done between 39~40 gestational weeks group and 76.8% of the cases was done between 39~42 weeks. 4. Indication of primary Cesarean section were C.P.D.(47.7%), breech presentation(25.9%), fetal distress(5.7%), placenta previa(4.0%) and miscellaneous. In nullipara, indications were similar to above in order. But in multipara, breech presentation was the highest incidence, 43.3% and C.P.D., placenta previa, fetal distress in order. 5. In the types of operation, lower cervical transverse incision was the most common(98.1%), classic type was 1.6% in rate and Cesarean hysterectomy was 0.3% in rate. The most common indication of Cesarean hysterectomy was uncontrolled bleeding from placenta previa. 6. In the incidental operation during Cesarean section, the tubal ligation was the most common(21.9%) and then Incidental appendectomy was 9.8% and salpingoophorectomy was 0.4% in rate. 7. 64.4% of the cases belonged to 500~900 ml blood loss group, and 1,000~1,499 blood loss group 33.4%, In the type of anesthesia, general anesthesia was performed 79.0% of total cases and spinal anesthesia was done 21.9%. 8. The rate of maternal morbidity was 6.8%, of which puerperal fever was 3.1%, and wound infection was 2.2% in rate. 9. In the relation of Hb. level and maternal morbidity, Hb. 10 gm% or less group revealed 10.7% of maternal morbidity and Hb. 10 gm% or over group revealed 13.8% of maternal morbidity.
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.
Festo 전기유압서보실습장치의 모델링과 최적 PID게인 설정
김철재(C. J. Kim),강용주(Y. J. Kang),최순우(S. W. Choi),허준영(J. Y. Huh) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
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.
김철재(C. J. Kim),허준영(J. Y. Huh) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.11
This study is a follow-up study on educational electro-hydraulic servo equipment. It consists of several different characteristics of the hydraulic inverted pendulum system components, simulation and experiment. Through this, I would like to present data that can efficiently apply the hydraulic servo system application learning. 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 optimal control is applied to the hydraulic inverted pendulum system and the results are discussed.