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韓國企業의 對中國 直接投資 所有持分率 決定에 관한 硏究
박주욱 국제지역학회 1998 국제지역연구 Vol.2 No.2
This study tries to analyze in depth the determination of ownership share in a foreign direct investment. The main purpose of this study is to test: empirically both the determinants of ownership and its effects on the FDI performance. The empirical findings are as follows: First, the determinants of Korean investment in China seem to include 7 factors. Second, the ownership seems to have a statistically significant influence on the investment performance. There are several implications of this study. First, this study identifies some determinants of ownership and tests a relation between ownership and performance of the investment. Second, the comparative advantage of Korean firms investing in China seems to be market-seeking motive. Finally, monopolistic and locational advantages of Korean investors seem to indirectly affect the investment performance through the decision of ownership share.
꿀벌부채명나방(Galleria mellonella) 성충의 Adipokinetic hormone의 분리.정제
박주욱,이충언,이경로 한국곤충학회 1999 Entomological Research Vol.29 No.2
꿀벌부채명나방(Galleria mellonella) 성충의 측심체에서 adipokinetic hormone을 분리.정제하여 아미노산 조성을 분석하였다. Adipokinetic hormone은 Sep-Pak $C_{18}$ cartridge와 thin layer chromatography의 병행사용에 의해 분리하였으며, 아미노산 조성은 Glu, Asp, Gly, Arg, Ser, Ala, Thr, Val, Leu, Phe, Trp으로 나타났다. An adipokinetic hormone was separated from corpora cardiaca of the adult greater wax moth, Galleria mellonella by Sep- Pak $C_{18}$ cartridge and thin layer chromatography. The amino acids composition of the adipokinetic hormone was determined after acid hydrolysis with 6N HCl and 4M mercaptoethane sulfonic acid. It contained the following amino acid residues : aspartic acid, glutamic acid, serine, glycine, arginine, threonine, alanine, valine, leucine, phenylalanine and tryptophan.
고주파 마그네트론 스퍼터링에 의해 형성된 Co / Pd 인공초격자의 수직자기이방성에 관한 연구
박주욱(J. W. Park),주승기(S. K. Joo) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Artificial superlattices of Co/Pd were prepared by RF magnetron sputtering. Multilayered structure and compositional modulation were analyzed with a wide angle x-ray diffractometer. It has been found that expansion of Co lattice occured in this artificial superlattice due to the lattice mismatch between Co and Pd. Perpendicular magnetic anisotropy could be observed when the Co layer thickness became less than 8Å and maximum coercivity of 2350 Oe could be obtained in [Co(2.5 Å)/Pd(9.3 Å)_(50)/Pd(200 Å) with a perfect squareness of magnetic hysteresis loop. Characteristic of perpendicular magnetic anisotropy in Co/Pd superlattices could be related to the expansion of Co lattice caused by Pd layer and it turned out that as the thickness of Pd layer increased, perpendicular magnetic anisotropy increased. The interface anisotropy energy and volume anisotropy energy were calculated to be 0.29 ergs/㎠ and -6.9×l0^6 ergs/㎤ respectively. which are consistent with the values reported elsewhere.