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- 발행기관 : 경북대학교 공과대학 (검색결과 245 건)
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裵尙根 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
In the design of pipelines, the currently used methods do not provide for a realistic assessment of either the actual safety of a structure or the reliability of the pipe response under an assumed service loading. This may be largely attributable to the inadequate definition of the supporting strength of a pipeline and to a lack of knowledge of the exact nature of the the loading on the system. In this study, probability theory was employed as a comparative tool relating the safety implications of the current design method to past experience. In order to calibrate the current design method with the limit state design procedure, the probabilities of failure and partial safety factors for design parameters were computed by using computer, in accordance with the Level Ⅱ method of reliability theory. The computed results showed that the design results based on the current proceduresfor the pipeline design have a probability of failure of about 2.5%, according to the limit state principles and when tighter supervision is exerted reliability of the pipelines can be increased greatly without changes in safety factors ; reliability of 99.95% can be achieved by reducing the coefficient of variation of 10% in the bedding factor.
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朴海德,洪俊杓,趙顯麒 경북대학교 공과대학 1980 工大硏究誌 Vol.9 No.-
Directional solidification experiments were conducted on Al-NiAl_3 eutectic alloys to analyze the tensile and torsional behaviors quantitatively. The effects of growth rate and copper content on the composite strength were investigated. The composite strength could be estimated by the rule of mixtures. And the calculated tensile and torsional strengths of NiAl_3 fiber were 165kg/㎟ and 28kg/㎟, respectively. In the case of tensile strength, the fiber contribution on the composite strength was great, but in the case of torsional strength the composite strength mainly depended on the matrix.
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황찬식 경북대학교 공과대학 1980 工大硏究誌 Vol.9 No.-
Two-Dimensional adaptive equalization is discussed for quadrature amplitude modulation (QAM) signal. Adaptive equalizer is composed of two tapped delay lines (TDL) for inphase and quadra ature signals, and each of TDL is controlled by two sets of tap weights. The tap weights are adaptively adjusted by the iterative procedure based on the gradient following algorithm for minimum mean-square-error. The system is implemented by digital circuitry. To understand the quantization effect on the convergence of the tap weights, the relation between the convergence and step-size in the iteration is investigated. It is shown that8-bit quantization and multiplication is applicable for 2400Hz binary QAM signal.
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Jun, Moo Jin 경북대학교 공과대학 1974 工大硏究誌 Vol.3 No.-
두 종류의 리간드 1,10-dibenzyltriethylenetetramine (1,10-Be_2 trien)과 1, 10-dibenzyl-5R-methyltriethylenetetramine (1,10-Be_2-5R-Metrien)을 합성하고, 이들 리간드의 디클로로코발트(Ⅲ) 착물을 제조하였다. 이들 두 tetramine리간드는 코발트(Ⅲ)이온에 대하여 트랜스 기하 배위를 아주 잘 형성한다. The synthesis of two ligands, 1, 10-dibenzyltriethylenetetramine (1, 10-Be_2 trien) and dibenzyl-5R-methyltriethylenetetamine (1,10-Be_2-5R-Metrien), and the preparation of dichloro cobalt (Ⅲ) complexes of these ligands are reported. Both tetramine ligands yield exclusively trans geometry upon coordination to cobalt (Ⅲ) ion.
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4-Vinylpyridine과 Methylmethacrylate의 共重合
鄭明秀,金祐埴,李學沂 경북대학교 공과대학 1973 工大硏究誌 Vol.2 No.-
Using n-butyl lithium as an initiator and n-hexane as a solvent, 4-vinylpyridine was copolymerized with methylmethacrylate at 0℃ and copolymer composition curve was obtained. Also the monomer reactivity ratios of this copolymerization system were determined by Fineman-Ross method. The mechanism of this copolymerization was discussed by these results.
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林龍進,崔正道 경북대학교 공과대학 1973 工大硏究誌 Vol.2 No.-
Because of its bad odor and dull color squid liver oil is not readily edible and can be used only as a low grade oil. In this work, the improved methods based on prior research on fish oil have been applied to the problem of deodorizing and decolorizing for squid liver oil. It was found that squid liver oil can be made edible by a combination of acid clay for decoloration and ethanol, boric acid and citric acid for deodorization. Squid liver oil has higher Vitamin A content than other food was also found.
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趙顯麒,金東義 경북대학교 공과대학 1971 工大硏究誌 Vol.1 No.-
Cr was gradually added as much as 0.4∼0.8% to chilled cast iron to increase the surface hardness and the wear resistance by the precipitation of carbide, especially Cr-carbide in this study. Results of this experiment showed that the wear resistance of chilled cast iron roll is increased by 40∼50% with the addition of 0.6∼0.7% Cr compared to cast iron without Cr. Si-alloy was added in laddle by the three different quantity, 1kg/t, 1.5kg/t, none, in order to homogenize the brittle columnar or dendritic structure formed under the rapid solidification in metal mold or special type of mold. Among the above three cases, the best wear resistance was obtained by 1kg/t of melt inoculation.
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초기응력이 있는 일단고정 Plate Strip의 선형 및 비선형해석
權永斗,徐昌敏 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
The set of finite element equations of motion of an initially stressed elastic solid is derived by using the principle of virtual displacement. And this is compared with what obtained from Hamilton's principle. The set of equations of motion is applied to an initially stressed fixed-free plate strip on the sudden lateral loading condition at the free end. By comparing numerical result, we shall examine the effect of incremental stresses, and the selective reduction of the order of Gauss-Legendre quadrature.
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MmNi_5(Mm=mischmetal)의 수소화 특성에 미치는 Fe, Cu 및 Al의 영향
김대룡 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
A study was made on the influence of substitution of metal elements affecting hydrogen absorption and desorption charateristics of MmNi_5 (Mm=mischemtal). By the substitution of Fe, Cu and Al for a part of Ni in MmNi_5, equilibrium hydrogen pressure and hysteresis energy for hydriding and dehydriding reactions were decreased and maximum hydrogen absorption capacities diminshed slightly. A relative stability of the hydrides was increased with increasing cell volume of the intermetallics by the substitutions. Thermodynamic data of the hydrides were obtained from the pressure-composition isotherms. During the absorption and desorption cycles by thermal cycling, hydrogen storage properties of MmNi_5 type intermetallic compounds were degradated due to microphase separation. But, in MmNi_4Fe_0.85Cu_0.15, degradation was less than other MmNi_5 type intermetallics.
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A Characeterization of Submanifolds of Codimension 2 in an even Dimensional Educlidean Space
Kim, Soon-Ja 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
1970년초 Blair, Ludden, Yano 등에 의해서 (f, g, u, v, λ) 구조의 특성은 연구되었는데 이것을 이용하여 우수차원 유크릿드공간의 여2차원 부분다양체의 형태를 결정하려는 많은 시도가 있었다. Okumura, Ki, Yano 등은 함수 λ(1-λ^2)이 영이라고 가정하여 부분다양체를 구면, 평면, 차원이 같은 두 구면의 적공간으로 분리하였다. 본 논문에서는 긴밀 부분다양체에서 λ(1-λ^2)의 제한없이 제3기본량이 영임을 먼저 증명하고 제2기본량이 평행함을 증명하여 같은 결과를 얻을 수 있다.
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