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Choi, Young-Chul,Yoon, Doo-Byung,Park, Jin-Ho,Kwon, Hyun-Sang Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.3
Elastic wave is one of the most useful tools for non-destructive tests in nuclear power plants. Since the elastic properties are indispensable for analyzing the behaviors of elastic waves, they should be predetermined within an acceptable accuracy. Nuclear power plants are exposed to harsh environmental conditions and hence the structures are degraded. It means that the Young's modulus becomes unreliable and in-situ measurement of Young's modulus is required from an engineering point of view. Young's modulus is estimated from the group velocity of propagating waves. Because the flexural wave of a plate is inherently dispersive, the group velocity is not clearly evaluated in temporal signal analysis. In order to overcome such ambiguity in estimation of group velocity, Wigner-Ville distribution as the time-frequency analysis technique was proposed and utilized. To verify the proposed method, experiments for steel and acryl plates were performed with accelerometers. The results show good estimation of the Young's modulus of two plates.
성영호,채원석,정철규 龍仁大學校 體育科學硏究所 2002 體育科學硏究論叢 Vol.12 No.1
Today, leisure activities have been a critical factor to lead to satisfactory life in our society from a personal and social perspective. The study for, up to now, to describe the correlation between leisure activities and leisure satisfaction has begun since 1970s. In the early stage of the study, main concern went to the relation of leisure activities, not to the leisure satisfaction, because of the difficulty of conception and measure. The main purpose of this paper to describe the influence of participation in the ski activities on the leisure activities on the basis of pre-performed studies that a positive participation in sports activities has improved the quality of life. To this end, this paper has explaine the relation between the frequency of participation in ski activities and leisure satisfaction as well as the relation between the period of participation and leisure satisfaction. In order to this purpose, this study targeting for 155 of university students and club involvers residing in Seoul and Kunggi province and have participated in winter sports more than a year employed the systemetric random sampling method. The method to collect data from questionnaire designed for this study is based on the sports activities-related questionnaire of the Korea Sport Science Institute(KSSI) and the measure for leisure satisfaction developed by Beard and Ragheb(1980), and translated and employed by Lee, Jong Kil. Through this method, the reliability and relevance of this study have been verified. According to the reliability of the study, The reliability(a) has shown. 726-842, which is very high. For data analysis, the frequency analysis and the multivariate analysis were employed. The reault of the study based on data analysis are as follows; First, it has been revealed that the higher the frequenty of participation in ski activities, the higher(educational, social, phychological, and physiological, and environmental) leisure satisfaction. Second, The results indicates that the longer the period of participation in ski activities, the higher(educational, social, phychological, and physiological) leisure satisfaction. Also the environmental leisure satisfaction has no relation with the period of participation from a satistical viewpoint. Based upon the analysis of the results and within limitation of this study, it was concluded that the participation in the ski activities enhances leisure satisfaction
호알칼리성 Bacillus sp.F204와 Bacillus sp.K17의 원형질체 융합
성낙계,노종수,박석규,정영철 순천대학교 기초과학연구소 1990 基礎科學硏究誌 Vol.1 No.-
To develop cellulase and xylanase-producing strain by protoplast fusion, alkalophilic Bacillus sp. F204 and K17 were treated with NTG(N-methyl-N'-nitro-N-nitrosoguanidine) and isolated antibiotics resistant strains of S20 (Km', Cm') and G70(Str'). The frequency of protoplast formation was about 95% when cells of mid-log phase were treated with 200㎍/㎖ lysozyme at 37℃ for 30-45 minutes. Under addition of 0.4-0.5M sodium succinate, 0.5% casamino acid, 1.5% polyvinylpyrrolidone, 25mM MgCl_2 and 50mM CaCl_2 to the regeneration medium, the regeneration frequency of Bacillus sp. F204 and K17 was 24.9% and 26.2%, respectively. the fusion frequency was 6.6×10^-6 in the presence of 30% polyethylene glycol 6000 containing 50mM Ca^++ at 45℃ for 5 minutes. Cellulase complex and xylanase activities of fusant were compared with parental strains.
성아영,이종헌,박상철,김상균,송경석 대불대학교 2002 論文集 Vol.8 No.1
Heine's Retinoscope is 100% dust proof and incorporates a unique Integrated Polarizing filter which eliminates all internal glare, providing for a clearer, brighter papillary reflex, enhancing performance and ease of examination, As a result of their data basis, we observed and analyzed which instrument has lesser occurring refracting aberration. Contact lens Wearers assuming best visual acuity lead 1.0(20/20) performed over refraction using Retinoscope. Auto Refractor, Auto Refrac-Keratometer and Suresight. The Auto refractor provides highly accurate measurement of patients refraction error. Auto Refrac-Keratometer provides precise and efficient refraction and Keratometry measurements and suggests contact lens base curve values. The automatic calculation of residual astigmatism assists in fitting RGP lenses. Also, suresight is a most convenient instrument for refraction. 30 contact lens wearers are chosen regardless of age, sex, and job. At least 30 minute after placing contact lens in each subjects eye, Performing over refraction by use of Retinoscope, Auto refractor, Auto refrac-Keratometer and suresight. Then presenting each results by graph in consist of spherical part, cylinder, axis, left eye and right eye separately.
태권도 수련유무에 따른 성격형성 및 교우관계 차이 분석
성영호,박성철 龍仁大學校 體育科學硏究所 2008 體育科學硏究論叢 Vol.17 No.1
The purpose of this research was to investigate differnces of character Formation and Peer Relationship according to Taekwondo practice participation or nonparticipation of elementary school children. for this, total 278 school children were sample using Multi -stage Stratified Cluster Random Sampling Method taking school children, who attended elementary school in Metropolitan City as of 2005, and those children who drilled Taekwondo in gym, as the population. After distribution of questionnaire concerned with "Differnece of Character Formation and Peer Relationship according to having or having not TaekwondoDrill of Elementary School Children" of which reliability had been verified through pre-survey, I asked the subjects to complete a survey and collected thereof, and treated data and information by means of Frequency Analysis, t-test, One way Anova, Scheff`s post-hoc Test, and Analysis of Covariance. The results from data and information analysis revealed the following conclusions. First, the results revealed that there were statistically significant differences in the factors relative to Lively Activity and Dominance among lower variables of Character Formation according to elementary school children`s gender. Meanwhile, there occurred significant differences only in Reliability Factor among the lower variables of peer Relationship Second, the results revealed that there were signficant differences in Lively Activity which was the lower variables of Chracter Formaton according to the school year of elementary school children. And there occurred significant differences only in Reliability Factor among the lower variables of Peer Relationship. Third, the results revealed that there were significant differences in Lively Activity, and Sociability which were the lower variables of Character Formation according to having or having not Taekwondo Drill. And there occurred signficant differences in Reliablity and feeling of Self-worth which were lower variables of Peer Relationship. Fouth, the results showed that there didn`t occur any significant diffreneces in entire lower variables of Character Formation according to Duration of Taekwondo Drill. Meanwhile, there occurred significant differences only in Feeling of Self-worth among the lower variables of Peer Relationship. Fifth, the results displayed that there were significant differences in the factors relative to Lively Activities and Sociabillty among the lower variables of Character Formation. And there occurred significant differences only in Reliability and Feeling of Self-worth among the lower variables of Peer Relationship.