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- 발행기관 : 國立 昌原大學校 基礎科學硏究所 (검색결과 138 건) 검색분석정보 보기
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이종근,강신준 國立 昌原大學校 基礎科學硏究所 1993 基礎科學硏究所論文集 Vol.4 No.-
본 논문에서는 n터플을 기초로 한 두 가지 완전 해쉬기법을 제시 하였다. 사실 n터플은 heuristic알고리즘을 이용하여 문자의 집합으로 표시할 수 있으며, 이는 다시 0/1 행렬이나 터플 테이블로 표시 된다. 본 연구에서는 Ziegler기법을 이용하여 완전 해쉬 함수를 구조하였다. In this paper, two new perfect hashing methods based on n-tuple are presented. A unique n-tuple from a set of words extracted by a heuristic algorithm. Then the extracted n-tuples are mapped into a 0/1 sparse matrix or tuple table. Using Ziegler's row displacement method or backtracking a perfect hash function is constructed.
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로봇 제어를 위한 신경망 컴퓨터의 학습 알고리즘 적용에 관한 연구
전인효,이우선 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
In this paper a trajectory control method is proposed for a robot manipulator using a learning algorithm of neuro computer. The proposed control scheme consists of a feedback controller and a feedforward controller. In this control scheme the feedback controller is proportional-derivative type, and the feedforward controller is the learning controller to learn the inverse model of robot manipulator dynamics by using the neuro computer. By applying the learning algorithm of neuro computer, neuro network controller does not directly require manipulator dynamics information and it learns the information by training and stores the information at connection weights. The simulation results demonstrate that a robot control system to apply the learning algorithm of neuro computer performs accuracy control and improved control speed. The control effects of the proposed system are verified by computer simulation.
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배현숙 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
The thermal degradation of cellulose fibers by impregnation with inorganic salts have been studied using the techniques of TGA and DTGA. A comparison of the temperatures of various percentage decomposition reveals that the thermal stability of rayon decreases owing to early decomposition of the cellulose fibers as compared to cotton. When cellulose fibers are impregnated with NH₄Cl, CaCl₂, AlCl₃ additives, there are a shift in the temperature of initial decomposition, final decomposition, maximum rate of weight loss and change of decomposition mechanism toward the lower side of the thermal decomposition temperature. And the values of activation energy changes in the temperature range 200℃∼400℃ through themogravimetry and X-ray crystallinity index is also discussed.
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CHARACTERISTIC POLYNOMIALS OF SOME WEIGHTED GRAPH BUNDLES AND ITS APPLICATION TO LINKS
LEE,JAEUN,SOHN,MOO YOUNG 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
In this paper, we introduce weighted graph bundles and study their characteristic polynomial. In particular, we show that the characteristic polynomial of a weighted K₂(K₂)-bundles over a weighted graph Γω can be expressed as a product of characteristic polynomials two weighted graphs whose underlying graphs are Γ As an application, we compute the signature of a link whose corresponding weighted graph is a double covering of that of a given link.
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Reactivity of α-Mesyloxystannanes with Organocopper Reagents: Preparation of Chiral Stannanes
Shin,Dong-Soo,Bhatt, Rama K.,Swain, Philip A.,Flack, J. R.,Ye, Jianhua 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
Sn2 displacement of enantio-enriched, unhindered α-mesyloxystannanes by organocopper reagents affords synthetically useful chiral stannanes in good to excellent yields.
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LiNbO₃:(Fe,Cu)단결정의 성장과 전기적성질에서의 불순물효과
김상수 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
LiNbO₃single crystal has attracted considerable interest because of their usefulness in the fields of nonlinear and electro-optical applications. In this study, we have grown the crystals of LiNbO₃,LiNbO₃:Fe,LiNbO₃:Cu,LiNbO₃:Fe+Cu from congruent melt in the RF furnace using Czochralski method and examined their physical properties, such as X-ray powder pattern, Laue pattern and frequency and temperature dependence of the dielectric constants and ac conductivities. Optimal growing conditions are as follows: pulling rate of 2mm/hr, rotating rate of 24rpm and cooling rate of 15℃/hr near transition point. We have found that LiNbO₃ single crystal undergo second order phase transition, its Curie constants are of an order of 10⁴and the transition temperatures are 1135.2℃, 1130.4℃, 1137.9℃ and 1127.2℃, respectively. The frequency dependent ac conductivities in single crystals, in the range from 100Hz to 10MHz and from 200℃ to 400℃, well satisfy the universal power law.
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불화시클로부탄의 적도방향 이형태체에 대한 LANL1DZ와 LANL2DZ와 Basis set에서의AB Intio 최적구조
이민주 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
The structural parameters and rotational constants of fluorocyclobutane, c-C₄H?F, have been obtained from ab initio calculations employing the LANL1DZ, and LANL2DZ basis sets for the equatorial conformer. The puckering angle is calculated to be 24.2。 and 17.4。 with the LANL1DZ and LANL2DZ, respectively. The rotational constants are obtained as A=10077.98, B=4228.49, and C=3369.54MHz with the LAN1DZ and A=9928.48, B=4261.93, and C=3385.77MHz with the LANL2DZ basis set. Also with these basis sets, it is not possible to get the optimized structure of the axial form.
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염화시클로부탄의 적도방향 이형태체에 대한 몇가지 Basis set에서 얻어진 최적구조 파라미터의 비교
이민주 國立昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
The utility of ab initio calculations for the determination of structural parameters for the equatorial conformer of chlorocyclobutane is demonstrated. It is shown that the C-H distances calculated with the LANL2DZ basis set give the best result when compare them with experimental values obtained form the microwave and the electron diffraction methods. For the structural parameters related to chlorine atom, the values obtained with the 3-21G*, 4-31G*, and 6-31G* are better than them with the LANL1DZ and LANL2DZ.
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Metal Ion Dependence of Pyrophosphate-Dependent Phosphofructokinase
조용권 國立昌原大學校 基礎科學硏究所 1989 基礎科學硏究所論文集 Vol.1 No.-
Cr(H₂O)₄ PPi was synthesized to test two metal dependent phosphorylation theory of fructose 6-phosphate by pyrophosphate-dependent phosphofructokinase. Cr(H₂O)₄ PPi acted as a competitive inhibitor in the absence of second metal ion with two dissociation constants indicating the possibility of the presence of activation site by pyrophosphate. To test whether or not Cr(H₂O)₄ PPi acts as a substrate, [³²P]Cr(H₂O)₄PPi was synthesized and incubated in the presence of second metal ion. The results indicate that Cr(H₂O)₄PPi acts as a substrate in the presence of second metal ion with a thousandth of regular activity. After binding of Cr(H₂O)₄PPi , saturation of MgPPi did not recover the activity completely indicating tight binding of Cr(H₂O)₄PPi . In other words, only binding of pyrophosphate before Cr(H₂O)₄PPi protects the inhibition completely.
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김봉수 國立 昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
A simulation study for the ordering kinetics in a soft spin version of the XY model in one dimension is presented and compared with the simulation carried out by Newman, Bray, and Moore for the original hard spin XY model. We do not find any nonuniversal features discriminating the two models:the excess energy relaxation, dynamic scaling and the growth law, and decay of the auto correlation function are fully identical for both models.
