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마이크로 스트립 路線에서 T-junction 및 Cross-junction의 不連續效果에 관한 硏究
梁承仁 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
The purpose of this study is to evaluate the discontinuity effects of microstrip lines with T-junction or Cross-junction. The scattering parameters, which are calculated from the equivalent circuits for discontinuities of microstrip lines, are compared at the various conditions. It is found that the larger the thickness of dielectric sustrate, the more remarkable the discontinuity effects of microstrip lines. This is in agreement with the physical reasoning. Because a microstrip line with thicker substrate has wider strip width under the same impedance. The results may be useful in the computer aided design of microwave integrated circuits.
김병기,김관중 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
Logic programs have many kinds of parallelism inherently. Various parallel execution mechanisms have been proposed to exploit these parallelisms. Among them CCND languages exploit don't care nondeterminism. Thus they can find only one solution. To build a general model of parallel execution for logic programs, we devise a new method to find all solutions with the CCND languages. A meta predicate is used to control the commit operation. With it the CCND languages can exploit don't know nondeterminism as well as don't care nondeterminism.
열처리한 Isotactic Polypropylene의 결정성과 용융거동
김영호 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
The effects of annealing of isotactic polypropylene (iPP) on the crystalline order and the melting behavior have been studied. By suitable programming of the crystallization history of unoriented sample, it was possible to show the change of the degree of ordering of the chains. Annealing at high temperature may lead to the transformation of crystals in the less ordered structure (closer to α1 modification) into ones having higher degree of order (closer to α2 modification). The samples annealed above 160℃ show double melting peaks at a heating rate of 10℃/min. The first peak is related to the melting of crystals having a structure nearer to that of α1 modification and the second one is related to the melting of crystals having a structure nearer to that of the α2 modification.
MmNi4.5Mn0.5 합금과 MnNi4.5Mo0.5 합금의수소흡수 및 방출특성에 관한 연구
송재식,김연상 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
As a fundmental research on the storage of hydrogen by using metal hydrides, the absorption-desorption characteristics of hydrogen for MmNi??Mn?? and MmNi?? Mo?? alloys were investigated. The relation among pressure, temperature and composition was examined for the alloy-H systems. The reacted readily with hydrogen to form hydrides of MmNi?? Mn? H?? and MmNi?? M0?? H?? (Hydrogen contents: 1.48 and 1.74 wt% respectively) under 60 atm hydrogen pressure and at room temperature(293 K). The enthalpy change in hydrogen formation determined from the formation isotherms were -6.55 and -7.18 kcal/molH₂and the dissociation pressure at 293 K was 10.9 and 11.4 atm respectively. The desorption rates of hydrogen for MmNi?? Mn?? and MmNi?? Mo?? were increased with increasing temperature. The apparent activation energy of hydrogen desorption for MmNi?? Mn?? and MmNi?? Mo?? alloys were smaller than those of LaNi? and MmNi?. Activation properties were enhanced for substitured Mo. The hydride of MmNi?? Mo?? proved to be suitable for use as a stationary heat storage material.
직접취득형 자연형 태양열 시스템에서 축열체의 배치 방법에 관한 실험적 연구
金光禹 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
The ultimate goal of this research is to improve the indoor environment and to reduce the heating load of buildings by the proper utilization of thermal mass. Four test rooms housed in a single envelope were constructed. Three variables; 1) quantity of thermal mass, 2) location of thermal mass, and 3) surface area of thermal mass; which were considered to be dominant factors for the design of thermal mass in passive solar heating systems, were selected and the test was conducted on them. Summary data are given for each of three test steps. In conclusion, thermal mass design guidelines for the direct gain passive solar heating system are suggested based on these observation.
固體內 빈자리 模型에 입각한 固體 Xenon의 統計熱力學
金完奎 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
Various thermodynamic properties, especially, the second derivatives of partition function of solid xenon are caculated over a wide range of temperature, i.e., 40 K to triple point, using the vacancies-in solid model with the Lennard-Jones 6-12 potential in the uniform potential field. The results are compared with other theoretical and experimental values and are in a good agreement with the available latest experimental values, especially, the sublimation pressure values caculated are in almost complete agreement with Chen's data.
김문헌,이대휘,이성열 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
This paper is investigate for EGR rate and inlet mixture heating effects which are variable of air-fuel ratio, spark timing and engine speed by experiment. Specially, the method of determination for MBT is suggested by equation (2) for EGR rate, air-fuel ratio and engine speed. NO concentrations are decrease by EGR effect and inlet mixture heating effect, and HC concentrations are decrease by inlet mixture heating effect.
습식방법에 따른 Mn-Zn ferrite의 분말합성 및 전기적 특성에 관한 연구
고재귀,박은희 崇實大學校 基礎科學.生産技術硏究所 1989 論文集 Vol.19 No.-
The effects of sintering temperature and sintering atmosphere on magnetic properties and microstructures of Mn-Zn ferrite have been studied. Magnetic properties of Mn-Zn ferrites are dependent on their purity and particle size. Ferrite powder was synthesized by using hydrolysis method. Each sulphate dissolved in water together and NaOH solution was added as a precipitant. Mixture of 53.17 mol% Fe₂O₃, 28.71 mol% MnO, 18.10 mol% ZnO was prepared and 0.02 mol% NiO was added as minor additives. After calcining and ball milling the powder was granulated for compacting. Sintering was carried out at 1200℃, 1250℃, 1300℃ and 1350℃ in the various atmosphere of N₂, N₂+ 3.3% O₂, N₂+ 4.1% O₂and N₂+ 4.9% O₂for 4 hours. The powders were measured by XRD and TGDTA. Density, shrinkage, Q-value and electrical properties were measured after sintering at each condition.