http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
An Overview of The Commercialisation of The Spray Forming Process
Leatham, Alan Korean Powder Metallurgy Institute 1996 한국분말재료학회지 (KPMI) Vol.3 No.4
(i) The development of a metallurgical bond during the spray forming of clad products has offered the possibility of manufacturing large rolls, including those used in hot and cold strip mills. Small rolls are already being produced in Japan. (ii) Technical developments, including the use-of-multi-atomizers have resulted in the elimination of porosity from the internal bore of a sprayed tube. Bimetallic tubing can also be manufactured and the installation of a 4.5 ton tube plant in the USA should provide low operation costs. (iii) Spray forming offers a potentially low cost manufacturing route for superalloy ring/casing components in high strength superalloys. (iv) A large pilot plant has been built for the spray forming of ultra-clean superalloys for turbine disc applications. (v) Using twin-atomizing technology, special steel billets have been spray formed up to 400mm diameter with deposition yields in excess of 90%. (vi) Al/Si alloy extrusion billets with excellent dimensional tolerances are being manufactured for large scale automotive applications. Several new aluminum alloys have also been developed, including high strength, low density and low cocfficient of expansion materials. (vii) New copper alloys have been developed and pilot plants are in operation to produce these alloys once markets have become established.
Structural Change in Stock Price Volatility of Asian Financial Markets
( Jin Woong Kim ),( Byeong Seon Seo ),( David J. Leatham ) 한양대학교 경제연구소 2010 JOURNAL OF ECONOMIC RESEARCH Vol.15 No.1
Structural change in the volatility of five Asian and U.S. stock markets is examined during the post-liberalization period (1990- 2005) of Asian financial markets using the Sup-LM test. Four Asian financial markets (Korea, Japan, Hong Kong, and Singapore) experienced structural changes. However, test results do not support the structural changes in volatility for Thailand and the U.S. Also, the empirical results show that the GARCH persistent coeffcients tend to increase while the ARCH impact coeffi- cients decrease in Asian markets, which implies that the volatility process has become more persistent.