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백점기,김도형 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
본 연구에서는 1축 압축력을 받는 보강판의 최종강도에 관한 각종 설계식의 계산정도를 비교 조사한다. 이를 위해 보강판의 압축최종강도 추정을 목적으로 널리 사용되고 있는 11개의 간이설계식을 조사하였다. 또한 보강판의 압축최종강도에 관한 각종 실험적 및 수치적 연구결과를 수집하여 이들 결과와 간이설계식에 의한 계산 결과를 비교 검토 하였다. 연구결과 기존의 간이설계식에 의한 최종강도 계산치는 서로 큰 차이를 보여주고 있었으며, 그 주된 이유는 1) 각종 발생가능한 붕괴모드, 2) 판재의 유효폭, 3) 초기결함 및 4) 보강재와 판재간의 회전속도를 엄밀하게 고려하지 않은데서 비롯된 것으로 분석되었다. A benchmark study is carried out on eleven existing formulations available to predict the ultimate strength of longitudinally stiffened panels under uniaxial compression. For this purpose, existing experimental data and numerical results related to the ultimate compressive strength of stiffened panels are first collected. Comparison of these experimental data / numerical results with the simplified solutions by the candidate methods is then performed. The formulations of effective width used to calculate the effective section properties of the stiffened panel within those formulations, after occurrence of buckling of plating between stiffeners, are also compared. Based on the calculated results, it is seen that there can be significant differences between the various estimates for ultimate strength based on the different formulations. Af potential reasons for the differences, the roles of four aspects, namely the collapse mode(s) involved, the effective width of plating, initial imperfections and rotational restraints due to stiffening are studied.
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박기배,한상도,이상호,Hua, Yang,김명녕 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
Thick film type oxygen sensors based TiO_(2) doped with WO_(3)(5.0[wt%]) were investigated. TiO_(2) powders were sintered by sol-gel processing method in air atmosphere. Particle sizes of WO_(3) doped TiO_(2) prepared with conventional and nano crystal process were approximately 1[μm]~0.1[μm] and 20[nm] respectively. The sensor prepared with small size WO_(3)-TiO_(2) powders showed more enhanced oxygen sensing characteristics
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熱分析에 의한 7075 알루미늄 합금의 二段時效에 關한 硏究
禹基道,尹正模 全北大學校 1984 論文集 Vol.26 No.-
Differential scanning calorimetry (DSC) was used to establish the microstructural effects of various aging treatment on aluminum alloy 7075. DSC was used to characterize the matrix microstructure while hardness tester was used to characterize the mechanical properties. The aging treatments were in three categories: isochronal pre-aging, isothermal pre-aging and isochronal final aging treatments. The results obtained in this study are as follows: 1. The variation in pre-aging treatment did not have much of effect on the final microstructures but that changing the final aging temperature had significant effects on the final microstructures. 2. When the pre-aging treatment was carried out for 6hr, 24hr and 96hr at 90℃ or 120℃ before final aging for 8hr at 150℃, the dissolution of G.P. zones decreased regulary as the time and temperature of pre-aging increased. 3. For two-step treatments where the first aging treatment is 4hr at 95℃, increasing the final aging temperature from 150℃ to 155℃ or 160℃ results in a significant increase in the amount of η' in the microstructure.
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李基哲,金都暎 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
Recently, AI techniques have been used for software products, but their application to software engineering area seems to be very limited. Especially, initial stage software cost estimation is one of the difficulties which software developing companies face in a real world. Ccocomo models have been widely used for this purpose, but considering the diversity of 4-th generation language-based software developments, static models need to be modified. In this paper, organic mode basic cost estimation equations of cocomo models are newly modified by using some elements estimatable in initial software development stages, and the new dynamically acquired equations were verified to be useful. We experimented with programs generated using a 4-th generation database tool. Cost, the number of main steps, and elements estimatable in the initial stage are collected, and features of projects were derived from them and used for the SOFM-based classification. For each classification, basic cocomo equation coefficients were newly calculated, used and compared with conventional cocomo model approaches. The experiments made in this paper are based on a small size of samples, and their results cannot be directly applied to various development environments. However, considering the adaptiveness of SOFM, the same technique may be adjusted and applied to each development environment.
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Cu-Al-Ni 合金에 있어서 마르텐사이트 變態에 따른 內部摩擦
趙顯麒,禹基道,金圭鎭 慶北大學校 1984 論文集 Vol.37 No.-
The internal friction measurement was carried out by the torsion pendulum method with automatic recording of the virbration patterns. The critical range of the martensitic transformation was checked by measuring the electrical resistance and by morphological observation. The extent of internal friction in the region of the peak depends on the previous rate of temperature change and decreases sharply during a few minutes of isothermal holding. The high level of internal friction found in Cu~Al-Ni alloy is likely to due to the reversible movement of interfacial and twin boundaries on exposure to alternating stresses.
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Al-Zn-Mg合金의 加工熱處理에 미치는 遷移元素의 影響
趙顯驥,李基大,金熙都 慶北大學校 1982 論文集 Vol.33 No.-
An investigation for influence of a small additions of transition metals (Mn, Zr, Cr) on the thermomechanical treatment (TMT) in Al-Zn-Mg alloys has been carried out by means of the measurements of tensile strength and micro-vickers hardness. The results obtained from this experiment are summarized as follows; 1) Hardness and strength of Al-Zn-Mg alloys are increased remarkable by a small additions of transition metals (Mn, Zr, Cr) at as-quenched state. 2) Influence of a small additions of transition metals like Mn, Zr and Cr added to Al-Zn-Mg alloys on ageing phenomena was retarding the ageing character. 3) The mechanical properties (hardness and strength) of Al-Zn-Mg alloys which were processed by TMT are increased when the deformation rate is lower than 30%, on the other hand those of Al-Zn-Mg alloys added transition metals were decreased with increasing deformation rate.
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