• Nonlinear Functional Analysis and Applications
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• v.27 no.1
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• pp.23-44
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• 2022

In this paper, we consider and introduce some new concepts of the biconvex functions involving an arbitrary bifunction and function. Some new relationships among various concepts of biconvex functions have been established. We have shown that the optimality conditions for the general biconvex functions can be characterized by a class of bivariational-like inequalities. Auxiliary principle technique is used to propose proximal point methods for solving general bivariational-like inequalities. We also discussed the conversance criteria for the suggested methods under pseudo-monotonicity. Our method of proof is very simple compared with methods. Several special cases are discussed as applications of our main concepts and results. It is a challenging problem to explore the applications of the general bivariational-like inequalities in pure and applied sciences.

• Journal of applied mathematics & informatics
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• v.28 no.3_4
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• pp.773-781
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• 2010

Recently, Yun [8] proposed a new three-step iterative method with the fourth-order convergence for solving nonlinear equations. By using his ideas, we develop a general form of multi-step iterative methods with higher order convergence for solving nonlinear equations, and then we study convergence analysis of the multi-step iterative methods. Lastly, some numerical experiments are given to illustrate the performance of the multi-step iterative methods.

• Journal of the Korean Data and Information Science Society
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• v.13 no.1
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• pp.129-137
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• 2002

Two-sample problem is frequently discussed problem in statistics. In this paper we consider the hypothese methods for the general two-sample problem and suggest the bootstrap methods. And we show that the modified Kolmogorov-Smirnov test is more efficient than the Kolmogorov-Smirnov test.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2004.11a
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• pp.171-178
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• 2004

This study suggests a general paradigm enhancing genetic mutability. Mutability among heterogeneous members in a genetic population has been a major problem in application of genetic programming to diverse business problems. This suggested paradigm is implemented to developing new methods from existing methods. Within the evolutionary approach taken to designing new methods, a general representation scheme of the genetic programming framework, called a kernel, is introduced. The kernel is derived from the literature of algorithms and heuristics for combinatorial optimization problems. The commonality and differences among these methods have been identified and again combined by following the genetic inheritance merging them. The kernel was tested for selected methods in combinatorial optimization. It not only duplicates the methods in the literature, it also confirms that each of the possible solutions from the genetic mutation is in a valid form, a running program. This evolutionary method suggests diverse hybrid methods in the form of complete programs through evolutionary processes. It finally summarizes its findings from genetic simulation with insight.

• Communications for Statistical Applications and Methods
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• v.11 no.1
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• pp.169-179
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• 2004

Partially balanced diallel cross designs with m-associate classes are defined and two general methods of construction are presented. Two-associate class designs based upon group divisible, triangular, and extended group divisible association schemes obtained using the general methods are also given. Tables of designs for p$\leq$24 are also provided.

• Clinical and Experimental Reproductive Medicine
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• v.39 no.4
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• pp.172-175
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• 2012

Objective: The aim of this study is to investigate the various causes of male infertility using multiple approaches. Methods: Nine-hundred-twenty infertile male patients were analyzed at their first visit with one physician between January 1 and December 31, 2009. All patients were subjected to physical examination and semen analysis and azoospermic patients underwent hormonal testing, chromosomal tests, and testicular biopsy. Semen analysis was based on the definition of the World Health Organization. Results: Among the 920 patients, 555 patients (60.3%) had semen results within the normal range, 269 patients (29.2%) within the abnormal range, and 96 (10.5%) were diagnosed with azoospermia. Varicoceles were diagnosed in 84 of the 555 normal-range patients (15.1%) and in 113 of the 269 abnormal-range patients (42.0%). Of the 96 patients with azoospermia, 24 patients (25%) were diagnosed with obstructive azoospermia, 68 patients (71%) with non-obstructive azoospermia, and 4 patients (4%) with retrograde ejaculation. Conclusion: Various causes of male infertility have been reported and diverse treatment methods can be adopted for each cause. In this regard, research must be conducted on a larger number of patients to accurately assess the various causes of infertility in Korean patients and to investigate various infertility treatment methods.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1995.10a
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• pp.76-85
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• 1995

The general equation of homogeneous strin for tube drawing has been derived. This can be applied to the general tube drawing method for non-zero plug angle. Also, the derived equation can represent Blazynski's equations for the sinking and tube drawing with a constant plug diameter. The general tube drawing was divided into two steps, sinking and contact drawing zones. The derived equation can calculate the homogeneous strains of the two steps. The various tube drawing methods such as fixed tapered plug, fixed mandrel, fixed back tapered plug, and floating plug have been analysed by the equation and finite element analysis. From the FEM calculations, the total strains and drawing stresses are obtained and consequently the redundancy factor of various drawing methods was analysed. The fixed back tapered plug method showed the largest redundancy factor and the floating plug method had the largest drawing stress.

• Journal of Korean Society for Quality Management
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• v.43 no.1
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• pp.85-102
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• 2015

Purpose: This study is aimed to develope effective guidelines of R&D institute with regard to general management cost, by analyzing the management characteristics of 14 domestic R&D institutes general management costs. Methods: The bootstrapping method is applied to obtain the average general management cost of 14 R&D institute and the effective R&D institutes are presented by comparing the general management costs of R&D and the rate of inflation. Results: The results show that the average R&D general management cost of 14 R&D institutes is 3.32% and, in general, it turns out that the R&D general management costs do not reflect the inflation rate after a comparative analysis of the variation of the R&D general management costs. In addition, the results of cost-effective analysis show that only 5 R&D institutes are efficient in R&D activities. Conclusion: Applying a uniform standard of R&D general management costs although their management characteristics are different, can cause the impediment to the independence and transparency of R&D institutes. Therefore it is recommended a strict implementation with respect to the monitoring system of each R&D institute and the budget policy methods which are reflected management characteristics.

• IE interfaces
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• v.18 no.1
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• pp.94-103
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• 2005

Digital Manufacturing is a technology to facilitate effective product developments and agile productions by digital environments representing the physical and logical schema and the behavior of real manufacturing system including manufacturing resources, processes and products. A digital factory as a well-designed and integrated environment is essential for successful applications of this technology. In this research, we constructed a sophisticated digital factory of an automotive company’ general assembly shop by measuring and 3-D CAD modeling using parametric methods. Specific parameters of each objects were decided by object-oriented schema of the general assembly shop. It is expected that this method is very useful for constructions of a digital factory, and helps to manage diverse information and re-use 3D models.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.870-875
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• 2003

This paper deals with the free vibrations of horizontally curved beams with the general boundary condition, which consists of translational and rotational springs. The equations of general boundary condition of such beams are derived, while the ordinary differential equations governing free vibrations are adopted from the literature. The parabola as the curved beam's curvilinear shape is considered in numerical examples. For calculating the natural frequencies, the governing equations are solved by numerical methods. The Runge-Kutta and Determinant Search Methods are used for integrating the differential equations and for calculating the natural frequencies, respectively. for validation purpose, the numerical results obtained herein are compared to those obtained from the SAP 2000. With regard to numerical results, the relationships between frequency parameters and various beam parameters are presented in the forms of Table and figures.