• Journal of the Korea Safety Management & Science
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• v.25 no.2
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• pp.187-192
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• 2023

In piping systems, trapeze hangers are subjected to vertical and horizontal seismic loads and stiffeners are used. In this study, monotonic compression tests were conducted with the removable stiffeners using three variables: stiffener clamp fixing position, section length, and installation direction. The maximum load reinforced with stiffeners could withstand a compressive load of 11kN by applying a safety factor of 10%. It could be estimated that the fixing clamp spacing or the length of shape and load had a proportional relationship. And the stiffener must be fixed in the direction of the strong axis on hinge parts. Also the stiffener buckiling load design proposes to use a method of calculate the flexural buckling compressive strength of and unreinforced full threaded bolt.

• Journal of applied mathematics & informatics
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• v.42 no.2
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• pp.321-331
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• 2024

We consider the numerical treatment of blow-up problems having non-monotonic singular solutions that tend to infinity at some point in the domain. The use of standard numerical methods for solving problems with blow-up solutions can lead to significant errors. The reason being that solutions of such problems have singularities whose positions are unknown in advance. To be able to integrate such non-monotonic blow-up problems, we describe and use a method of non-local transformations. To show the efficiency of the method, we present a comparison of exact and numerical solutions in addition to some comparison with the work of other authors.

• Journal of the Korean Data and Information Science Society
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• v.17 no.2
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• pp.657-659
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• 2006

This note gives a counterexample showing that a main theorem of Aytal and Pehliven's (Information Sciences 176 (2006) 734-744) result on statically monotonic and bounded sequences of fuzzy numbers is not valid.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.344-347
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• 2011

In this paper, we propose the power control problem for cognitive radio networks (CRNs) that maximizes the total utility of the secondary users (SUs). We use the interference temperature constraints to protect the primary users (PUs). The utility functions of SUs can be any increasing functions. We formulate the power control problem as monotonic optimization that can be solved in centralization to achieve the global optimum.

• Journal of the Korean Mathematical Society
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• v.43 no.2
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• pp.297-309
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• 2006

In this paper, we consider cooperative games arising from integer domination problem on graphs. We introduce two games, ${\kappa}-domination$ game and its monotonic relaxed game, and focus on their cores. We first give characterizations of the cores and the relationship between them. Furthermore, a common necessary and sufficient condition for the balancedness of both games is obtained by making use of the technique of linear programming and its duality.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05a
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• pp.150-153
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• 2006

The purpose of this research is focused on evaluating the flexural behavior of reinforced concrete beam having 22mm diameter re-bars by lapping methods. To compare the existent lapping method with mechanical lapping methods, four cases of concrete beams were tested to be failed flexurally by monotonic loading. Based on test results, the relations between load and displacement, ductility, maximum load was comparatively analyzed. The structural performance on four cases of members were evaluated.

• Bulletin of the Korean Mathematical Society
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• v.47 no.1
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• pp.103-111
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• 2010

In the present paper, we give two new proofs for the necessary and sufficient condition $\alpha\leq1$ such that the function $x^{\alpha}[lnx-\psi(x)]$ is completely monotonic on (0,$\infty$).

• Journal of Korean Society for Quality Management
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• v.25 no.4
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• pp.99-105
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• 1997

We consider a nonparametric estimation of the renewal function. In this paper, we suggest modified methods for Frees's estimator to enhance the efficiency. The methods are based on a piecewise linearization and on the fact that the bounded monotonic functions converging pointwise to the bounded monotonic continuous function converge uniformly. In a simulation study, we show that the modified methods have the better efficiency than that introduced by Frees.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.281-284
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• 2000

이 논문은 웨이브릿 변환 영역의 백색 가우시안 잡음이 부가된 영상에서 최고 대역에서는 Donoho가 제시한 Visushrink 방법으로 잡음을 제거하고 최저대역을 제외한 나머지 대역들은 Monotonic 변환을 이용한 각 대역의 잡음편차를 추정하고 이를 VisuShrink 경계값에 적용하여 Soft-Threshold 기법으로 영상잡음을 제거하는 방법을 제안하였다. 실험 결과 이 논문에서 제시된 혼합방법에 의한 잡음 제거는 Donoho가 제시한 VisuShrink 방법보다 1㏈ 정도의 잡음제거 개선 효과가 있었다.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.27-36
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• 2005

Finite failure NHPP models presented in the literature exhibit either constant, monotonic increasing or monotonic decreasing failure occurrence rates Per fault. This Paper Proposes reliability model using the generalized gamma distribution, which can capture the monotonic increasing(or monotonic decreasing) nature of the failure occurrence rate per fault. Equations to estimate the parameters of the generalized gamma finite failure NHPP model based on failure data collected in the form of interfailure times are developed. For the sake of proposing shape parameter of the generalized gamma distribution, used to the special pattern. Data set, where the underlying failure process could not be adequately described by the knowing models, which motivated the development of the gamma or Weibull model. Analysis of failure data set for the generalized gamma modell, using arithmetic and Laplace trend tests . goodness-of-fit test, bias tests is presented.