This paper has been carried out the forming analysis, die stress analysis, and relevant tests for the straightness improvement of hollow shafts with blocktooth. Hollow forward extrusion is a process that a material in a die is pressed with a punch and the material is formed into the same direction through the gap of a mandrel and a bottom die. For an asymmetric shaped product, due to the difference of reduction ratios of the cross sections in its extruding, a phenomenon that the product bends from the difference of the flow speed comes to occur. As applying the key to the mandrel has a uniform flow speed, bending problem was solved. These were processed using Deform-3D as a finite-element analysis program. Analysis was compared with the experiment. Keyway height of the mandrel has been confirmed that the straightness best when it comes 0.1mm. These study are expected to be available as fundamental data in die design necessary for the manufacture of asymmetric goods in the future.
Lee, Jang-Song & Shin, Gyeong-Shik. 2004. A Study of Codeswitching by the Korean-Chinese People Living in Chenguoz District of Harbin. The Sociolinguistic Journal of Korea, 12(1). The main purpose of this paper is to analyze Korean-Chinese people's usage of Korean and Chinese in terms of code-switching. To be more specific, the study is focused on analyzing the bilingualism within the Korean community in Chenguoz District of Harbin, Heirungjiang Province, China. The study especially focuses on clarifying the reciprocal relationship between the Korean language and the Chinese language, examining the difference in the usage of the two languages according to age groups. This specific area was selected as our subject, since most of the Korean communities in the Heirungjiang area were formed by descendents of the immigrants from the southern provinces of the Korean Peninsula, which allows the comparison between the language used today and the language their ancestors used before moving to this area. Due to the industrialization and innovation brought about by the opening of the Chinese society, the fast outward flow of youths to urban areas, and greater assimilation threats from the embedding Chinese culture, we are not too sure if the Korean language will continue to be used in the future. Given these circumstances, we consider this research most opportune in that it provides a look into the Korean community that developed its distinctive culture and language within an isolated cultural environment.