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Yan, Bing Chun,Park, Joon Ha,Kim, Sung Koo,Choi, Jung Hoon,Lee, Choong Hyun,Yoo, Ki-Yeon,Kwon, Young-Geun,Kim, Young-Myeong,Kim, Jong-Dai,Won, Moo-Ho Kluwer Academic/Plenum Publishers 2012 Cellular and molecular neurobiology Vol.32 No.8
<P>In the present study, we investigated neuronal death/damage in the gerbil hippocampal CA1 region (CA1) and compared changes in some trophic factors, such as brain-derived neurotrophic factor (BDNF), glial cell line-derived neurotrophic factor (GDNF) and vascular endothelial growth factor (VEGF), in the CA1 between the adult and young gerbils after 5 min of transient cerebral ischemia. Most of pyramidal neurons (89%) were damaged 4 days after ischemia-reperfusion (I-R) in the adult; however, in the young, about 59% of pyramidal neurons were damaged 7 days after I-R. The immunoreactivity and levels of BDNF and VEGF, not GDNF, in the CA1 of the normal young were lower than those in the normal adult. Four days after I-R in the adult group, the immunoreactivity and levels of BDNF and VEGF were distinctively decreased, and the immunoreactivity and level of GDNF were increased. However, in the young group, all of their immunoreactivities and levels were much higher than those in the normal young group. From 7 days after I-R, all the immunoreactivities and levels were apparently decreased compared to those of the normal adult and young. In brief, we confirmed our recent finding: more delayed and less neuronal death occurred in the young following I-R, and we newly found that the immunoreactivities of trophic factors, such as BDNF, GDNF, and VEGF, in the stratum pyramidale of the CA1 in the young gerbil were much higher than those in the adult gerbil 4 days after transient cerebral ischemia.</P>
3차 스플라인 보간법을 적용한 비디오 포멧 변환기의 하드웨어 구현
권영민,이범근,이재준,정연모 경희-다반 ASIC 설계교육센터 2000 경희-다반 ASIC센터 논문집 Vol.1 No.-
The purpose of format conversion is to convert a wide range of personal computer video formats into a target format. Circuits for the conversion have been developed by means of interpolation techniques, such as zero-order interpolation, bilinear interpolation, and bisigmoidal interpolation. This paper proposes a scan converter using cubic splines. The converter was modeled in VHDL on Max+PlusⅡ and implemented with an FPGA chip. The circuit gives much better conversion performance than a scan converter with zero-order or linear interpolation.
權寧勤 건국대학교 1989 論文集 Vol.28 No.1
Sraffa's system of economic theory achieves its perfect frame work in Production of Commodities by means of Commodities(1960). Sraffa has reached his formation of economic system through two essential studies ; critical works on the Marshallian economics which is based on the assumption of the laws of returns under competitive conditions and research works on David Ricardo's economic theory The main purpose of Sraffa's system of economic theory is to present the foundation for a critique of marginalist theory or Supply and Demand theory of value and distribution. At the same time, his theory proposes a return to views held by the classical political economist. Thus Sraffa and his followers are named Neo-Ricardian. Sraffian analysis of production prices needs no assumptions about returns to scale, and his economic system does not depend on changes in the scale of production or in the proportions of factors, In the general case where surplus goes both to the capitalist and to the laborers, the price system, P= (1+r)Ap+wL, has one degree of freedom. Given the technology of production, and the variable of distribution, the production prices are determined irrespective of demand. In this case, the aspect of distribution constitutes the linear relation between the rate of profits and the wage, r=R(1-w). Sraffa's methodology of economic theory is similar to that of philosopher, wittgenstein, L in Philosophical Investigations(1953). Sraffa had a great influence on the writings of Wittgenstein, L. ; There can not be the only kind of language and proposition for the description of the world (reality). It is in the social and historical context that language, proposition and theory have their meanings. The point of his method is that there in no general theory of language Sraffa's methodology is a fundamental critique of the neoclassical economics including the marginal theory and the goneral equilibrium theory based on the methodological individualism, the logical positivism, and the reconstituted reductionism. Hin approach to the theory of prices represents a critique of the marginal theory of value and distribution, for he shows that it is possible to determine relative prices without any reference to marginal change. His theory represente a critique of neo-classical theory based on the aggregate production function and the possibility of the reswitching of the same technique. His theory shows that either there may be a tendancy towards uniformity of wages and the rate of profit in different lines of production, or prices may be governde by supply and demand, but not both. Where supply and demand rule, there is no room for uniform levels of wages and the rate of profit. Thus, Sraffa's theory, also, includes a possibility of the critique to the genera equilibrium theory. There are fundamental differences between hrs theory and Marx's : one is their methodology, another in their purposes and objects of analysis, the other is that the labor theory of value is excluded from Sraffa's economic theory. Therefore, his theory can not be regarded as a critique on Marx's theory. His theory has brought about the capital controversy of the 1960's, through which the critique on the mainstream economics of neo-classical theory was preformed considerably. The Marxian renaissance was induced, in a lartge measure, by the formal similarity of his theory and Marx's, and the inttinsic critique on the main stream economics. Thus, since the 1970's, the theory of value has been under a active controversy from the aspect of transformation problem and theory of crisis.
PZT께 압전 세라믹스의 제조 및 기계적 특성에 관한 연구
崔永根,權鍾完 慶一大學校 1993 論文集 Vol.9 No.1
Densification behavior, microstructural evolution and mechanical properties of hot-pressed specimens using PZT ceramics with PbO additive were studied, and bulk density, microstructure, mechanical properties were investigated for sintering time. Fracture toughness of the spections containing 1mol% PbO was increased as the hot-pressing temperature up to 1080℃ and maximum value was 1.60MN/m??, while fracture toughness of the specimens containing 2mol% PbO was decreased. The enhanced fracture toughness by PbO is probably due to the crack deflection along the boundaries of the elongated grains. Vicker's hardness of the specimens was in the range of 270-320Kgf/mm² and was decreased due to the incrasing of pore according to PbO addition. As the sintering time becomes longer, fracture toughness was gradually decreased for the the increasing of grain size and vicker's hardness was shown the linear increasing lue to increase of density.