Microstructural evolution in the thickness direction of an oxygen free copper processed by accumulative rollbonding (ARB) is investigated by electron back scatter diffraction (EBSD) measurement. For the ARB, two copper alloy sheets 1 mm thick, 30 mm wide and 300 mm long are first degreased and wire-brushed for sound bonding. The sheets are then stacked and roll-bonded by about 50% reduction rolling without lubrication at an ambient temperature. The bonded sheet is then cut to the two pieces of the same dimensions and the same procedure was repeated on the sheets up to eight cycles. The specimen after 1 cycle showed inhomogeneous microstructure in the thickness direction so that the grains near the surface were finer than those near the center. This inhomogeneity decreased with an increasing number of ARB cycles, and the grain sizes of the specimens after 3 cycles were almost identical. In addition, the aspect ratio of the grains decreased with an increasing number of ARB cycles due to the subdivision of the grains by shear deformation. The fraction of grains with high angle grain boundaries also increased with continuing process of the ARB so that it was higher than that of the low angle grain boundaries in specimens after 3 cycles. A discontinuous dynamic recrystallization occurred partially in specimens after 5 cycles.

탈추격형 혁신체제가 강조됨에 따라 국가연구개발사업은 기술역량 향상에 초 점을 맞춰온 기존의 방식과 달리 문제해결⋅실용화⋅사회적 영향을 모두 아우른 통합적 접 근을 필요로 한다. 이러한 상황에서는 R&D예산의 효과적⋅효율적 집행과 성과관리가 중요 한 과제이나, 기존의 성과평가제도는 획일적 평가, 양적지표 위주 등으로 인해 한계를 가지 고 있다. 본 연구에서는 이러한 문제점에 대응하기 위해 우리나라의 국가연구개발사업 성과 평가의 진화과정을 조사⋅분석⋅평가 체제와 1,2차 성과평가기본계획 체제 세 시기로 나누 어 제반 법⋅제도, 평가체제 및 내용, 평가의 활용 등의 요소를 비교분석하였다. 성과평가제도는 조사⋅분석⋅평가에서 1차 기본계획, 2차 기본계획으로 이행되면서 R&D자원 투입에 따른 양적 성과관리 위주에서 연구사업의 다각적 측면을 평가하기 위한 수단으로 진화하였다. 그 과정에서 평가인프라, 표준성과지표 등 평가체계의 고도화⋅실효성을 제고하기 위한 제도적 장치가 다수 마련되었다. 1차 기본계획에서는 과학기술행정체 계의 잦은 개편이 성과평가 진화의 일관성에 영향을 미쳤으나, 2차 기본계획 이후 체계가 안정화되면서 성과평가제도는 우리나라 혁신시스템 전환을 뒷받침할 수 있는 방향으로 개 선되고 있다.

다변량통계기법은 수리지구화학 자료의 분석 및 해석에 많이 이용되어 왔다. 본 연구에서 대응분석과 주성분분석을 동시에 사용하여 인위적인 활동에 의한 지하수의 특징을 살펴보았다. 본 연구의 목적은 NETPATH 프로그램 속의 WATEQ4F를 이용하여 지하수 화학성분의 분화를 계산하고 이를 다변량통계기법을 이용하여 지구화학적인 정보를 추출하는 것이다. 연구지역은 한반도의 남동쪽에 위치한 울산의 LPG 저장시설이다. 본 연구지역에서는 다른 저장시설에서 관찰되는 초염기성의 조성을 가지는 지하수가 관찰되었다. 이러한 인위적인 영향에 의한 높은 pH를 가지는 지하수로 인해 Al의 분화특징과 탄산염의 침전을 유발할 수 있다. 본 연구에서는 연구지역에 지하수에 영향을 주는 두 인위적인 요소(세정작용와 시멘트영향)에 의해서 수리지구화학적인 특징과 상이 어떻게 변하는 가에 초점을 두었다. 이전 연구결과와 두 통계분석을 통해 제시된 결과를 비교하여 지구화학적인 정보를 이용한 주성분분석과 대응분석인 수리지구화학 연구에서 기초연구로 활용될 수 있음을 알 수 있다.

The effects of processing parameters on the flow behavior and microstructures were investigated in hotcompression of powder metallurgy (P/M) Ti-6Al-4V alloy. The alloy was fabricated by a blended elemental (B/E)approach and it exhibited lamellar α+β microstructure. The hot compression tests were performed in the range of tem-perature 800-1000℃ with 50℃ intervals, strain rate 10−4-10 s−1, and strain up to 0.5. At 800-950℃, continuous flowsoftening after a peak stress was observed with strain rates lower than 0.1 s−1. At strain rates higher than 1 s−1, rapiddrop in flow stress with strain hardening or broad oscillations was recorded. The processing map of P/M Ti-6Al-4V wasdesigned based on the compression test and revealed the peak efficiency at 850℃ and 0.001 s−1. As the processing tem-perature increased, the volume fraction of β phase was increased. In addition, below 950℃, the globularization of phaseat the slower strain rate and kinking microstructures were found. Based on these data, the preferred working conditionof the alloy may be in the range of 850-950℃ and strain rate of 0.001-0.01 s−1.

15Cr-1Mo base oxide dispersion strengthened (ODS) steel which is considered to be as a promising candidate for high- temperature components in nuclear fusion and fission systems because of its excellent high temperature strength, corrosion and radiation resistance was fabricated by using mechanical alloying, hot isostatic pressing and hot rolling. Torsion tests were performed at room temperature, leading to two different shear strain routes in the forward and reverse directions. In this study, microstructure evolution of the ODS steel during simple shearing was investigated. Fine grained microstructure and a cell structure of dislocation with low angle boundaries were characterized with shear strain in the shear deformed region by electron backscattered diffraction (EBSD). Grain refinement with shear strain resulted in an increase in hardness. After the forward-reverse torsion, the hardness value was measured to be higher than that of the forward torsion only with an identical shear strain amount, suggesting that new dislocation cell structures inside the grain were generated, thus resulting in a larger strengthening of the steel.

As a macroscopic research for the interface of MMORPG(Massive Multiplayer Online Role Playing Game) in Korea, I have analyzed the introduction background & mutual characteristic of each interface according to the development shifts of MMORPG. The MMORPG of Korea, in the mid-1990s, was started while taking a foreign MUD (Multi User Dungeon) games, which used 'Text Interface' based on the keyboard. When Information and communication infrastructure was expanded in earnest in the late 1990s, Computer games interface was rapidly changed to GUI(Graphic User Interface) based on 2D graphic from text-based UI. So, Games of this period used the 'Point & Click Interface' that uses the mouse only to move character and carry out combat. Since graphic technology was changed to 3D in the middle of 2000's, The interface of MMOGPG for three-dimensional representation was naturally changed to 'keyboard control Interface' which used both mouse and keyboard. Recently, 'Action Control Interface' that was hardly used to MMORPG was appeared due to progress of game programming technology. And 'Diversity of play pattern' & 'Non-targeting' are attributes of 'Action Control Interface', which is differentiated with other interfaces.

Insects possess two distinct acetylcholinesterases (AChE1 vs. AChE2), which are encoded by two paralogous loci originated from duplication. Kinetic analyses of several insect AChEs revealed that both AChE1 and AChE2 retain common catalytic properties of AChE but subtle kinetic differences also exist between these two AChEs. To understand how selection pressure has shaped the protein structure of AChEs and affected their function during evolution, we measured and compared the nucleotide diversity (Pi) and amino acid site-specific selection pressure between AChE1 and AChE2 from various insects. Highly conserved were the majority of the amino acid residues involved in forming the essential domains, including peripheral anionic site (PAS), and little differences were revealed between AChE1 and AChE2, suggesting the presence of strong purifying selection pressure over these essential residues. Interestingly, the EF-hand like motif was mostly found in the AChE1 lineage but not in AChE2. In addition, a unique amino acid difference in the PAS (D72 vs. Y72) was highly conserved between AChE1 and AChE2. Three-dimensional modeling of insect AChEs by particularly focusing on the PAS revealed that a subtle but consistent structural alteration in the active site topology was caused by the PAS amino acid substitution. Taken together, despite the long evolutionary history and low overall sequence similarity, both insect AChE1 and AChE2 still share a extremely high degree of structural and functional conservation, indicative of a strong purifying selection pressure. Nevertheless, only a small change in the PAS, appears to be associated with a local but significant alteration of AChE2 structure, which in turn drives the functional differentiation of AChE.