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박영철,Osamu Kitade,Michael Schwarz,Joo Pil Kim,김원 한국분자세포생물학회 2006 Molecules and cells Vol.21 No.1
Population structure was investigated in Reticulitermes speratus populations in the Korean Peninsula and the Japanese Archipelago. All trees derived from analyses of the combined sequence dataset of two mitochondrial genes, COII and COIII, showed that R. speratus populations cluster into two major clades comprising the Korean/southern Japanese populations and the northern Japanese populations. Analysis of population genetic structure showed strong genetic partitioning between populations of the two clades. To understand historical migration routes and current distributions, the phylogeographic history of R. speratus was inferred from intra-/interspecific phylogeny and divergence times estimated between the clades of the phylogenetic tree. The estimated migration route and divergence time of ancestral R. speratus are congruent with recent paleogeographic hypotheses involving land-bridge connections between the Asian continent and the Japanese Archipelago. We suggest that ancestral R. speratus separated into northern and southern Japanese populations after its migration into the Japanese main islands from East China during the early Pleistocene via the East China Sea basin, which may have been exposed during that period. The Korean populations seem to have diverged recently from southern Japanese populations; this may explain the current distribution of R. speratus in the Japanese Arachipelago, and account for why it is restricted to northern areas of the Tokara Strait.
분말야금법을 이용한 TiNi기 형상기억 복합재료의 기계적특성에 관한 연구
박영철,윤두표,박민식,김광영 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
In this study, It is introduced that TiNi/Al-radical shape memory composite as one of new material that used shape memory alloy (SMA). It is a method to produce a better strength of composite by occuring compressive residual stress in matrix, using shape memory effect of TiNi fiber. This method os replaced of tensile residual stress happened by difference of coeffients of thermal expansion (CTE) between fiber and matrix, one of the significant faults of metal matrix composite (MMC). In this paper, shape memory composites are made by powder metallurgy. And then, an self-strengthening effect of the composites by shape memory effect above inverse transformation temperature A_f of TiNi alloy are discussed. Moreover, TiNiCo/Al composites is made by using TiNiCo alloy as fiber. And it is discussed about affection of Co in the shape memory composite. The results of the intelligent properties of TiNi/Al-radical shape memory composite, using SMA, by powder metallurgy are the tensile strength of TiNiCo wire is much higher than that of TiNi wire and the strength of TiNiCo/Al composite is generally higher than of TiNi/Al composite.
박영철,유승문,Park, Yeong-Cheol,Yu, Seung-Mun 한국방위산업진흥회 1992 國防과 技術 Vol.- No.160
전력화 정보 통신체계란 통신의 전력화 요소를 적극적으로 발전시켜 다른 체계를 지원하는 것은 물론, 각종 정보를 실시간 전송하며, 통신기법을 이용하여 통신자간의 거리 측정 및 위치 파악 기능 등을 제공함으로써 직접적으로 군 전략향상에 기여한다. 즉 전술통신망 및 전략통신망을 상호 연동운용하며, $C^3I$ 체계 및 조기경보/전장감시 체계를 적극 지원할수 있는 한국군 독자적인 정보 통신체계이다. 이 글에서는 이러한 전략화 정보 통신체계를 구현키 위한 군 종합정보통신망(MISDN)을 기술하고, 21세기를 위한 군 정보 및 통신기술 발전 전망을 제안한다