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허철수(Zhezhu Xu),최종훈(Jong-Hun Choi),김현구(Hyun-Ku Kim),신중호(Joong-Ho Shin),류성기(Sung-Ki Lyu) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.1
Ball screw systems are largely used in industry for motion control and motor applications. But the problem of noise, which really perplexes us, is highly correlated with the quality in ball screw systems all the way. In this paper, machining process parameters were evaluated in respects of technique, business, produce and quality to verify which impact influences the noise most. In order to adjust and compare, two comparison groups were set with the present parameters bench mark. Different ball screws were produced as specimens for the noise tests. Through comparing the noise performance of different parameters in the machining process respectively, a group of optimized machining process parameters were obtained. Another noise test was proceeded to know how noise performance was improved by optimizing the machining process parameters. At last, surface roughness tests have been done to know how surface roughness improved by optimization. The improvement of surface roughness is the main factor influences the noise performances.
허철수 濟州大學校 學生生活硏究所 2000 學生生活硏究 Vol.21 No.-
AbstractI. Several Viewpoints on Juvenile Problem BehaviorA different guidance can be applied depending on the standpoint from which we are viewing the problems juveniles are going throught.Firstly, the guidance chosen can depend on whethere we are looking at those problems as the process or as the deterministic result. The former means we treat the problems as nothing more thant tasks all juveniles inevitably confront and have to go through, derivng from the process of their growth. In this regard the guidance is focused on preventive measures. On the other hand, the latter views the juveniles problems as socialils, takes a gloomy and negative view and considers them just like an inveterate or maligant disease or even a sin. Consequently, their guidance is concentrated on prohibition and compulsion.secondly, the gudance selection can also depend on whether our concerns about the problems are based on a social stance or on a human stance. Theier delinquent and insubordinate behavior invite a great deal of criticism. However, we need to consider their anguish, worries, frustration, conficts and the like which are ingrained deep in their subconsicious from a human stance.Thirdly, we need to recognize that the juvenile problems are a reflection of an adult society. Their problems are not created in their own separate world. What they see, feel and interpret, how they behave and how they think are learned from adults.II. Comprehensive Factors Causing Juvenile Problem BehaviorSchool factors are considered in the following cases: when the school does not detect and correct in its early stages the fact that the juveniles do not feel a strong attachment to their school or are losing their sense of attachment. This kind of attachment loss results from the failure of a successful relationship with their teachers or from poor progress of school records.Household factors are a single parent family, inappropriate fostering surroundings family members' personal problems, conflicts between family memebers, or other crucia family incidents, which lead to the juvenile problems, too.Social factors are found in the case that the juvenile is tempted by other out-of-school surroundings, not attracted by a household or a shcoolIndividual factors include the juvenile adaptability to home, school and society situations, their personality and a behavioral facotr.III. Effective Guidance of the JuvenileFirstly, juvenile guidance should not only look at the negative side, "problems" but also at the positive side, "growth and process"Secondly, a family factor should be given priority over other factors. The home discipline should be strengthened and a social climate should be prepared to prevent a single-parent family or broken home.Thirdly, circumstances for a sound juvenile culture should be provided.Finally, parents and teachers need to be expert counselors.
허철수 濟州大學校 學生生活硏究所 2003 學生生活硏究 Vol.24 No.-
The ultimate purpose for this study is to develop more effective parental attitudes, comparing, and analysing the similarities and the dissimiliarities between the two groups. The certificated test questionnaires produced by Kim Gi-jung are used, and 562 Korean, and 563 Chinese middle-highschool students are answer them for the successful research. The attitudes are recognized at the views of the answering students. The conclusion drawn from the research is First, Korean parents are more rejection, while the Chinese take more acceptive approval for their children. There are two types of parental attitude on their children(about mistakes, opinions, worries of their children); rejectional, acceptable. Chinese parents respond more acceptably. The next characteristics could be drawn from the research is the difference of allowing control-autonomy to their children. Chinese parents are more autonomous on the children, but the Korean more control and regulative for them. Parents in China are less regulative their children(about their studies, the relationships among friends, and the occurrences) than those who are in Korea. The abundant attitude is another tendency which Chinese parents have more than the Korean. About the marks of school, school enterance, and studies, the Chinese are more overabundent, but the Korean are not. Between Korean parents harmonize more with their children than those in China. The final result we got from the research is that Chinese parents are commonly generous during the elementary school period before during the middle school period which they become more regulative, and pay more attention, and expect more of their children about their studies, mistakes, relationships with friends, and the natural result of the attitude lead the psychological distance between the parents and their children.