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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.
성낙도,유성재,남기달,장기혁,한호규 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-
기질(S) 화합물로 30종의 5,6-dihydro-2-trifluoromethyl-1,4-oxathiin carboxanilide 유도체들을 합성하고 벼 잎집무늬 마름병균(Rhizoctonia solani)과 밀 붉은 녹병균(Puccinia recondita)에 대한 항균활성(in vivo) 값(pI_50)을 측정하였다. (S)는 잘록병균보다 밀 붉은녹병균에 대하여 보다 큰 항균활성을 나타내었으며 두 종의 균에 대하여 3-methoxy, 11, 3-iso-propyloxy, 13 및 3-iso-propyl 치환체, 25가 제일 큰 활성을 보였다. 그리고 치환(X)-phenylcarbamoyl group의 변화에 따른 물리-화학 파라미터와 항균활성(pI_50)으로부터 구조-활성관계(SAR)를 검토 한 결과, 벼 잎집무늬 마름병균에 대하여는 공명효과에 따른 전자밀게(R<0)의 소수성이 큰(π>0) m-alkyl 치환기(X)가, 그리고 밀 붉은녹병균에 대하여는 분자 분극율(Sp.Po1.)과 분자의 음하전(ABSQ<0)을 위시하여 HOMO에너지(e.v.)가 클수록(HOMO<0) 높은 항균활성을 나타내었다. 또한, 전하-조절 반응에 의한 수용체-(S)간의 상호작용과 높은 활성발현 조건들이 검토되었다.(1998년 2월 3일 접수, 1998년 12월 1일 수리) New thirty derivatives of 5,6-dihydro-2-trifluoromethyl-1,4-oxathiin carboxanilide as substrate(S) were synthesized and their fungicidal activities in vivo against rice sheath blight(Rhizoctonia solani) and wheat leaf rust(Puccinia recondita) were examined. The structure activity relationships(SAR) between the activities(pI_50) and a physicochemical parameters of substituents(X) at the phenylcarbamoyl group were analyzed using the adaptive regression analysis method. The 3-methoxy, 11, 3-isopropyloxy, 13 and 3-isopropyl substituent, 25 as X on the phenylcarbamoyl group exhibited the most highest fungicidal activity against the two fungi. The fungicidal potency of the (S) against Puccinia recondita was higher than Rhizoctonia solani. In case of Rhizoctonia solani, the molecular hydrophobicity(π>0) and resonance effect(R<0) by meta-alkyl substitutents with electron donating were important factors in determining fungicidal activity. And the HOMO energy(HOMO>0), ABSQ, sum of absolute values of the atomic charges on each atom and specific polarizability(Sp.Pol<0) of (S) were significantly influential towards fungicidal activity against Puccinia recondita. The interaction between (S) and receptor against from the based on SAR studies proceeds through charge-control reaction, and conditions to show higher activity has been also discussed.
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
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.
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.