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Die filling behavior of Mg alloy slurry in semi-solid processing
이덕영,김기배,문중화,석현광,김성빈 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.3
In this study, to produce a thin product for a nocturnal fluoroscope cover from a Mg alloy by semi-solid processing, the die filling behavior of a semi-solid slurry was simulated with an ANYCAST program which was compared with the real product. The rheological behavior of the semi-solid slurry of the Mg alloy was considered in a computational fluid dynamic study using the reported data between the viscosity and shear rate of a semi-solid slurry of the Mg alloy. Also, in order to analyze precisely the rheological behavior, the ANYCAST program based on the Carreau model was used to simulate the flow behavior during the filling by the semi-solid slurry into a die mold in a high pressure diecasting machine. Further the time-dependent heat transfer coefficient between the die mold and casting was considered in the simulation study. The predicted defects from the simulated study with the ANYCAST program matched well with those in the actual product.
이덕영 한국일본어학회 2014 日本語學硏究 Vol.0 No.42
Directives constitute a very basic way in which tasks and activities of everyday life get organised (Goodwin and Cekaite, 2013), and have strict connection with the pragmatic dimensions of face and politeness (Mauri and Sanso, 2011). Directives are ‘face threatening act’, in Brown and Levinson’s (1987) terms, and have the ability to impose the speaker’s will upon the hearer. The use of directives thus sensitively reflects the way of interacting with other members of the society. A language often adopts various linguistic strategies (grammatical markers and constructions) to perform these acts in different ways from those in other languages. The aim of the current study is to explore the use of directive strategies in modern Korean and Japanese from the cross-linguistic and cross-cultural point of view, and shed light on some aspects of the interrelationship between language and culture. By taking a closer look at special characteristics in the use of directives in Korean and Japanese, the study has confirmed the basic, but very important schema that languages adopt different linguistic strategies under the influence of the different rules and norms in establishing and maintaining interpersonal relationships in different cultures. To be more specific, the study has revealed that in adopting directives strategies, the Korean culture tends to rely more on the ‘hierarchical interpersonal relationship’ whereas the Japanese culture tends to rely more on ‘consideration for others’ as well as the hierarchical relationship.
수행지식 지연 간격이 배드민턴 클리어 기술 학습에 미치는 영향
이덕영 公州敎育大學 敎育硏究所 2000 公州敎大論叢 Vol.37 No.1
The purpose of this study is to investigate whether knowledge of performance(KP) delay interval as motor learning variable has an effect on sports skill learning using open skill rather than closed skill in the sports situation requiring gross muscle movement and coordinating movement. The subjects of the study are 15 high school right-handed girl students who have not had any previous experience with the task of this study and the 15 students are randomly divided into three groups of five (0”,3”,and 5"). The task uses the clear skill in badminton among the start of activity is stimulated by externally-paced tasks or skills. The knowledge of result(KR) and KP are provided to the subjects according to the delay conditions. Considering that the task of this study is externally -paced skill, setting the inter-trial time to 15" except the KP delay interval (0”,3",5") prevents the loss of kinematic information. Before the experiment the subjects practiced the clear skill individually for one hour six days without information providing from the teacher or coach. KP as kinematic information was provided to the subjects on the every trial and the fundamental problem-solving information was given first among much error information. The amount of the information was limited to one error information per trial and let them correct the motion. The first six days are the acquisition phase and the 20 trials were repeatedly measured per day. After two-day rest, the retention test was given on the 9th day. The result of this study shows that immediate(0") KP delay interval condition is more effective than 3〃 and 5" KP delay interval condition by F(2, 12)=5.22, p< .05. And on the retention phase where learning effect can be inferred, the immediate(0”)KP delay condition is more effective than 3" and 5" KP delay condition and 3" condition is more effective than 5" condition by F(2. 12)=5.03, p< .05. With this result, it is thought that the shorter the delay is the better the effect of the given information can be in the case of providing KP in the motor skill learning.