• The Korean Journal of Applied Statistics
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• v.25 no.3
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• pp.531-541
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• 2012

In this study, we consider various methods to estimate the weights of a pairwise comparison matrix in the Analytic Hierarchy Process widely applied in various decision-making fields. This paper uses a data dependent simulation to evaluate the statistical accuracy, minimum violation and minimum norm of the obtaining weight methods from a reciprocal symmetric matrix. No method dominates others in all criteria. Least squares methods perform best in point of mean squared errors; however, the eigenvectors method has an advantage in the minimum norm.

• Korean Journal of Materials Research
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• v.9 no.4
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• pp.434-438
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• 1999

Vickers microhardness for polished Cu specimen has been measured by conventional and new methods. The conventional microhardness was measured by observing the diagonal of indentation after the load was removed. Whereas, the new method for microhardness was obtained by measuring the penetration depth of indenter into the specimen under the load. As the applied load was increased, the microhardness obtained by new method was increased. When the applied load was in the range of 5mN to 80mN, the rate of elastic to total depth of indenter was about 6% and the calculated depth of rounded indenter was 0.07$\mu\textrm{m}$. The difference in microhardness measured by two different methods such as conventional and new methods can be explained in terms of the elastic deformation of specimen, the shape of practical indenter and pile up of material.

• Journal of the Korean Society for Advanced Composite Structures
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• v.3 no.3
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• pp.38-46
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• 2012

The method based on various mathematical characteristic equations for identifying tensile forces in the cable structure system are used as response data to reflect the properties of the dynamic sensitivity. The vibration tests have been conducted with respect to levels of applied weight for the sagged cable. In this study, a set of natural frequencies are extracted from the measured dynamic data. Next, existing characteristic equation methods based these extracted natural frequencies are applied to identify tensil forces of the sagged cable system. Through several verification procedures, the proposed methods could be applied to a sagged cable system when the initial material data are insufficiency.

• Journal of the Korean housing association
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• v.14 no.6
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• pp.135-146
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• 2003

The purpose of this study is to provide the technical methods of apartment remodeling. To gather information, a survey of the technical methods of apartment remodeling in domestic and foreign was conducted. As a case study, three types will be applicable to apartment remodeling： Horizontally expanding remodeling, combining remodeling, conversion remodeling. The results of the study are as follows： 1. Horizontally expanding remodeling type will be applied the dry construction and anchor pile foundation at skeleton and the double flooring at infill. 2. Combining remodeling type will be applied the dry wall construction in order to establish or remove the partition walls. 3. Conversion remodeling type will be applied that converting building equipments and interior finish materials conversion of old to new materials.

• Journal of the Korean Applied Science and Technology
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• v.12 no.1
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• pp.119-124
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• 1995

Conventional alkaline catalytic procedure, including sodium methoxide-methanol N, N, N', N'-tetramethyl guanidine-methanol, and acid-catalytic methods of $BF_{3}-methanol$ and HCI-methanol, have been applied for preparing methyl esters from the triacylglycerols of Trichosanthes kirilowiil seeds containing conjugated trienoic acids. The alkaline catalytic methods produce the methyl esters quantitatively without isomerization of the conjugated trienoic acids, but the acid-catalytic ones destroy almost the molecules of conjugated trienoic acids during transesterification of the triacylglycerols although the molar ratios of monoenoic and dienoic acids (non-conjugated) to saturated acids are in good agreement with those obtained from the alkaline methods.

• Journal of Ocean Engineering and Technology
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• v.18 no.1
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• pp.35-40
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• 2004

This paper is concerned with the simulator's ability to estimate deformation due to welding of panel blocks. An efficient computer program system has been developed which can be applied both to estimation of weld-induced deformation, under the given welding conditions, and to reflection of effect when methods for deformation control of are applied. This paper briefly describes the background of the present simulator and shows some results applying the simulator to the estimation of weld-induced deformation. In addition, the results when methods for deformation control are applied are also included.

• Computers and Concrete
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• v.24 no.1
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• pp.7-17
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• 2019

The complex phenomenon of the bond formation in geopolymer is not well understood and therefore, difficult to model. This paper present applied statistical models for evaluating the compressive strength of geopolymer. The applied statistical models studied are divided into three different categories - linear regression [least absolute shrinkage and selection operator (LASSO) and elastic net], tree regression [decision and bagging tree] and kernel methods (support vector regression (SVR), kernel ridge regression (KRR), Gaussian process regression (GPR), relevance vector machine (RVM)]. The performance of the methods is compared in terms of error indices, computational effort, convergence and residuals. Based on the present study, kernel based methods (GPR and KRR) are recommended for evaluating compressive strength of Geopolymer concrete.

• Mass Spectrometry Letters
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• v.13 no.2
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• pp.35-40
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• 2022

Human tissues and organs can be preserved intact by fixation with formalin for the future analysis of biomolecules of interest. With the advances in high-throughput methods, numerous protocols have been developed and optimized to attain the most pathophysiological information out of biomolecules, including RNA and proteins, in formalin-fixed samples. However, there is no systematic study to examine the effects of formalin fixation on the lipidome of biological samples in a global fashion. In this study, we conducted a mass spectrometry-based analysis to survey the alteration in the lipidome of mice brains by fixation methods. A total of 308 lipids were quantitatively measured using triple quadrupole mass spectrometry. We found that most were unchanged after formalin fixation except for a few lipid classes such as phosphatidylethanolamine.

• The Journal of Information Technology and Database
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• v.6 no.2
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• pp.29-43
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• 1999

Object-oriented development methodologies require consistent and seamless object-oriented paradigm to be applied from analysis to testing. Testing must focuses on the state of aggregated objects. This paper suggests testing methods that satisfy such requirements. In order to confirm appropriate implementation of the user requirements, the methods apply extended use case[Jacobson et al., 1992] that are prepared form analysis stage. Testing must be performed based on the use cases because the user requirements are formally documented in the use cases. The notations of the original use case are modified for the state-based testings. The testing methods consist of a unit testing and four-level of integration testing. Particularly, the level 0 testing is based on FREE state machine [Binder, 1995, 1996]. The testing methods have been applied to 3 projects and proved their practicability.

• Journal of applied mathematics & informatics
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• v.26 no.1_2
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• pp.135-149
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• 2008

Many deterministic systems are described by Ordinary differential equations and can often be improved by including stochastic effects, but numerical methods for solving stochastic differential equations(SDEs) are required, and work in this area is far less advanced than for deterministic differential equations. In this paper,first we follow [7] to describe Runge-Kutta methods with order 2 from Taylor approximations in the weak sense and present two well known Runge-Kutta methods, RK2-TO and RK2-PL. Then we obtain a new 3-stage explicit Runge-Kutta with order 2 in weak sense and compare the numerical results among these three methods.