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PVA-ECC를 활용한 Half PC 복합체의 역학적 특성에 관한 실험적 연구
김재환,김영덕,김갑수,조봉석,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
ECC represents one particular class of HPFRCC, which are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This study is to provide the fundamental data for the development of hybrid construction method such as the half PC(Precast concrete) reinforced by PVA-ECC, the mechanical properties of half PC according to the alteration of properties of PVA-ECC in terms of the type of fiber, Vr, S/M, placing height of PVA-ECC, are experimentally investigated. As the results. it is found that the half PCs of PVA-ECC have very higher mechanical performance in terms of yield load, strain capacity beyond yield point and maximum flexural load than that of mortar. Also, flexural crack in the half PCs of PVA-ECC are not localized at first crack and are growed to many micro crack, especially multiple cracking in specimen of P(12)-30-0.1ㆍ3 occurred.
내구성을 고려한 표면피복재의 성능평가에 관한 실험적 연구
김영덕,조봉석,윤종기,김용로,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
It is recognized that reinforcement corrosion is the main distress behind the present concern regarding concrete durability. The basic method to prevent reinforcement corrosion is coating the reinforcement concrete with surface coating materials but evaluating their performance is necessary to the work satisfactory because they have different performance for each other. In this study. to evaluate performance of surface coating materials, we compare their properties in terms of sticking strength and permeability of carbonation, chloride ion and water with actual reinforcement corrosion under environment of complex deterioration. The results showed that an increase in age also decreases Carbonation velocity coefficients, increases Chloride ion diffusion coefficients and increases water absorption coefficients. As well, an increase in age also increases corrosion of reinforcement due to permeability of carbonation and chloride ion. And sticking strength of inorganic coating material is higher than organic coating material.
A Sequential Algorithm for Finding Restricted D-Optimal Designs
김종덕 부산외국어대학교 1991 外大論叢 Vol.9 No.2
Experimental situations where replicate values of x are not feasible and the design space is restricted to N equally spaced pints are considered. Under these restrictions D-optimal designs for selecting the n distinct values of x in polynomial regression models are investigated. A sequential algorithm is developed and its performance is evaluated for small values of N and n where the restricted D-optimal designs can be found by an exhaustive search algorithm. The sequential algorithm gives excellent performance for the cases considered both in terms of efficiency and computing time.
김성배,정덕영,박종환,김성홍,여수동 慶北大擧校 師範大學 科學敎育硏究所 2000 科學敎育硏究誌 Vol.24 No.-
The necessity of the internet-aided instruction, and the advantages and restrictions of it were widely investigated as theoretical background, and the general principle of designing the instruction, model of procedure in science class, practical design of the internet-aided instruction procedure of it's development and effective approach of web design. On the basis of the above, experiment contents of 10 units in highschool common science (department of chemistry)were reconstructed, and deployment plan for teaching-learning guidance papers for experiments, reports of experiments, individualized problem for evaluation, self-learning references, guidance papers for teaching, figure files for forming concepts and principles were made. Experimental unit of chemical reaction speed which is difficult for the first grade highschool students is established, and it is made a form of CD-ROM title with animation and presentation techniques. As a result, Learning environment which raised learner's motivation was presented. Further more, based on web instruction model and instruction design principle for learning with internet, teaching-learning home page with HTML was made.
김종덕 釜山外國語大學校 2005 外大論叢 Vol.30 No.-
PCR, RR and PLSR are regression methods to estimate parameters in a linear model when predictor variables are highly collinear. One way to gain some insight into the properties of the estimators is to examine their respective shrinkage structures. This can be done by expanding their solutions in terms of the eigenvectors of the predictor-sample correlation matrix and the OLS estimate. This paper gave a detailed description of the shrinking structure in the eigenspaces for PCR, RR and PLSR. It showed how each solution vector shrinks along each of the eigendirections, and its overall shrinkage as well. Using real-world data set, the ratio of the shrinkage along each direction and overall shrinkage ratio were shown for each method. All the three biased solutions of their optimal models showed similar pattern of heavy shrinking in the small-spread eigendirections. But the amount of shrinkage in the directions varied with different solutions. The PCR and PLSR solutions showed more overall shrinkage than that of RR, and this was due to their heavy shrinkage along the two eigendirections with small eigenvalues.
김종덕 부산 외국어 대학교 2004 外大論叢 Vol.29 No.-
Multivariate partial least squares method, which has been widely used in chemometrics, has been mainly introduced as algorithms. Since they are of iterative forms and different authors use different symbols for the algorithms it often leads to a sea of confusion. In the literature, usually PLS1 algorithm is introduced first and PLS2 is explained as an extension of PLS1. In this paper we have introduced a principle of the partial least squares method and developed several PLS2 algorithms according to the principle, and verified the equivalence of the algorithms. We have then induced PLS1 algorithm as a special case of PLS2. SAS/IML codes for the developed algorithms are listed in the appendix.
스트레인 게이지를 이용한 두께 최적화 하단고정체에 대한 구조시험 평가
김재훈,사정우,김덕희 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
The atomic fuel rods between the top and bottom end piece of reactor need to be extended for the high combustion rate of future-type fuel to increase the irradiation in the axial direction. For allowing the axial extension of the fuel rods, the space between the top and bottom end piece should be expanded. Thus the thickness optimization of the flow plate is necessary. This study was carried out the mechanical strength test by using strain gages as a function of flow plate thickness, the existence of skirt and loading condition for the Korean fuel assembly(KOFA). The experimental apparatus was designed for load conditions, uniformly distributed load and displacement. Test method using whiffle tree of uniformly distributed load has been comparatively conservative. The test results were compared with those of FEM analysis and the test method on bottom end piece was established.
金明建,許永德,金鍾珪 단국대학교 1994 論文集 Vol.28 No.-
The effect of solvnets upon the absorption spectra of open forms of spiroanthraoxazine and spiro-6-nitropyran have been examined. For the case of spiroanthraoxazine, the visible absorption maximum shifts to longer wavelength as the polarity of the solvent is increased(i.e., positive solvatochromism). The open structure of spiroanthraoxazine, may be considered the quinoid type. In spiro-6-nitropyran, a hypsochromic shift os observed as the polarity of solvent is increased (i.e., negative solvatochromism). It is likely that the open structure of spiro-6-nitropyran is the zwitter ion type. The enthalpy changies between the closed form and the open form of spiroanthraoxazine, and spiro-6-nitropyran were measured. Wiht increasing polarity of solvent, the enthalpy changies of spiroanthraoxazine, and spiro-6-nitropyran decrease.