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申澤均 大邱敎育大學校 科學敎育硏究所 1979 과학·수학교육연구 Vol.4 No.-
In this paper, it was intended for the children to develop their concepts of numbers in mathematics and to survey the features of their concepts of numbers. For this purpose, the objectives were the normal 69 kindergarden pupils and 494 pre-school children in Kyeongbuk area. And it was divided into 3 parts to find the concepts as follows: a) Calling the numbers in order b) Counting the materials c) Picking up the materials by number The basic abilities of the concepts were also surveyed for this purpose as follows: a) Equivalence in classifications b) Equivalence in numbers c) Conservation of numbers Here the results of this study were found by the method of proceeding parts of the concepts as follows: a) Children's abilities of calling and counting numbers were growing by their ages and developed by almost the same level. The abilities were able to be caught at the age of 4:3∼5, 5:6∼7,6:11∼20. b) Their abilities of picking up the materials by numbers were able to be caught at the ages of 4:3∼4,5:4∼5,6:8∼10and found to be undeveloped as compared with above two abilities. c) The city living children's concepts were a little more developed than those in the rural community and especially the abilities of calling and counting numbers differ city children from rural children by ther growing ages. d) Their concepts of semi-numbers were different in their circumstances but they were not strongly different. In kindergarten, they were developed quicker a year more than the other general children. e) Their equivalences in classification and number were almost same to both children and the age for this abilities seems to be at the age of 5. f) Their abilities of conservation of numbers were later than the other abilities. The age for this abilities are at the age of 6.
NH₃-O₂-Ar 혼합기체의 점화 과정에서 H₂기체의 첨가 효과에 관한 연구
신권수,배균택 崇實大學校 2000 論文集 Vol.30 No.1
The addition effect of H₂on ignition of NH₃-O₂-Ar mixtures was examined in the temperature range of 1521-2193 K and the pressures in the range of 0.86-1.78 bar behind reflected shock waves. The ignition delay times were measured by monitoring pressure profiles and the OH emissions at 1.0 cm from the end wall. To complement the experiment, computer modeling study of the ignition of NH₃-O₂-Ar mixtures was carried out using various mechanisms reported previously.
Gyun-Tack Bae 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.5
We studied the structures and electronic properties of copper oxide clusters, Cu3On (n = 1–6), using ab initio Monte Carlo simulations and density functional theory calculations. All lowest energy structures of neutral and charged Cu3O n clusters with n = 1–6 are optimized with the B3LYP functional and LANL2DZ basis set. We found that the lowest energy structures of neutral and charged Cu3O n (n = 1–6) clusters are planar or near-planar. Selected electronic properties including atomization energies, ionization energies, electron affinities, second difference in energies, HOMO–LUMO gaps, and Bader charges are calculated and examined for each n. We concluded that the Cu3O3 cluster is the first ring structure and the most stable structure.
이홍균(Hong-Gyun Lee),이정철(Jung-Chul Lee),정택기(Tack-Gi Jung),정동화(Dong-Hwa Chung) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper investigates the adaptive control of a fuzzy logic based speed and flux controller for a vector controlled induction motor drive A model reference adaptive scheme is proposed in which the adaptation mechanism is executed by fuzzy logic based on the error and change of error measured between the motor speed and output of a reference model The control performance of the model reference adaptive control(MRAC) fuzzy controller is evaluated by simulation for various operating conditions The validity of the proposed MRAC fuzzy controller is confirmed by performance results for induction motor drive system