• Fibers and Polymers
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• v.6 no.2
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• pp.162-168
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• 2005

A methodology for the objective evaluation of water repellency is studied using image analysis of the sprayed pattern on woven fabrics according to a standard spray test (AATCC Test Method 22-2001). The wet area ratio obtained from the spray standard test ranking is found to be exponentially related with its water repellency rating. Mean filtering is used to remove the effect of weave texture and the transmitted light through interyarn spaces. The ring frame of the instrument and wet region are recognized using Otsu thresholding technique. And Hough transform and outline operation are used to obtain the size and position of the ring frame. The objective assessment of the water repellency using image processing can reduce unnecessary confusion in the subjective determination of the water repellency.

• Journal of the Korea Safety Management & Science
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• v.4 no.1
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• pp.131-139
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• 2002

Since introducing the "Theory of Constraints" by Goldratt, its effect was verified by lots of scholars, men of enterprise. These days it is also introducing and studying in this country with good results. The objective of this study is to show how to determine the constraint resources on DBR scheduling. Actually, previous studies based on the line which just think a load/capacity rate on doing scheduling. This study will show a scheduling method which reflects multi-parameters. It could be a standard to reflect real manufacturing surroundings. On calculating a priority of each resources, we classified factors with subjective and objective factors. And we propose a decision model to incorporate values assigned by a group of experts on different factors to select a critical resource. On deploying this model, SN ratio of Taguchi method for each of subjective and objective factors will be used. And we propose a procedure which is organized with 7 steps. To understand the logic, a numerical manufacturing simulation will be presented. This method is a incorporating decision model on determining the constraint on multi parameters with experts.h experts.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.4
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• pp.94-101
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• 2003

Recently, miniaturization and weight reduction is getting more attention due to various benefits in automotive components design. It is a trend that the design of experiment(DOE) and statical design method are frequently used for optimization. In this research, the safety of lower control arm is evaluated according to its material change form S45C to A16061 for the reduction of arm's weight. The variance analysis on the basis of structure analysis and DOE is applied to the lower control m. We have proposed a statistical design model to evaluate the effect of structural modification by performing the practical multi-objective optimization considering mass, stress and deflection.

• Current Optics and Photonics
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• v.4 no.4
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• pp.353-360
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• 2020

Adopting an elaborately designed reflective objective consisting of four mirrors, we have developed a rotating-polarizer-type microspot spectroscopic ellipsometer (SE) with an ultra-small spot size. The diameter of the focused beam, whether evaluated using a direct-image method or a knife-edge method, is less than 8.4 ㎛. After proper correction for the polarizing effect of the mirrors in the reflective objective, we unambiguously determine the dispersion of the complex refractive index and the thickness of monolayer MoS₂ using the measured microspot-spectroellipsometric data. The measured ellipsometric spectra are sensitive enough to identify small variations in thickness of MoS₂ flakes, which ranged from 0.48 nm to 0.67 nm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.7
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• pp.2377-2389
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• 2022

At present people have higher and higher requirements for network video quality, but video quality will be impaired by various factors, so video quality assessment has become more and more important. This paper focuses on the video quality assessment method using different fuzzy neural networks. Firstly, the main factors that impair the video quality are introduced, such as unit time jamming times, average pause time, blur degree and block effect. Secondly, two fuzzy neural network models are used to build the objective assessment method. By adjusting the network structure to optimize the assessment model, the objective assessment value of video quality is obtained. Meanwhile the advantages and disadvantages of the two models are analysed. Lastly, the proposed method is compared with many recent related assessment methods. This paper will give the experimental results and the detail of assessment process.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.1
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• pp.63-69
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• 2015

In this paper, infrared reflector design targeting infrared stealth effect is presented using structural optimization based on the phase field method. The analysis model was determined to accomplish the design that an incident infrared wave was reflected to a desired direction. The design process was to maximize the objective value at the measuring domain located in a target region and the design objective was set to the Poynting vector value which represents the energy flux. Optimization results were obtained according to the variation of some parameter values related to the phase field method. The model with a maximum objective value was selected as the final optimal model. The optimal model was modified to eliminate the gray scale using the cut-off method and it confirmed improved performance. In addition, to check the desired effect in the middle wave infrared range(MWIR), the analysis was performed by changing the input wavelength. The finite element analysis and optimization process were performed by using the commercial package COMSOL combined with the Matlab programming.

• Journal of the Korea Convergence Society
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• v.11 no.11
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• pp.147-154
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• 2020

The purpose of this study is to analyze how parents' income, goal, expectancy, and value affect their parents' child supporting behavior, and to understand the behavior of parents supporting their children of elite athletes. For this, the influence relations of parental supporting cost/time according to income, children's achievement level, parents' sports parenting objective, achievement expectancy, and task value were analyzed through simple regression analysis and hierarchical regression analysis. As a result of the study, income and identity objective had an effect on supporting time. Income affected the supporting cost. Achievement expectancy had a moderating effect of income on supporting cost, and usefulness value had a moderating effect on income and relational objective. It is significant that it provided a quantitative basis for understanding parents' child supporting behavior.

• The Journal of the Korea Contents Association
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• v.19 no.2
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• pp.22-35
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• 2019

Utilizing fit theory in strategic human resource management, this study examines the impact of two HR practices on newcomer turnover rates. While there is a growing body of research identifying the linkage between high-performance work systems(HPWS) and improved organizational performance through higer employee commitment, little research addresses how specific mechanisms among the systems deliver different performances to organizations. Using management by objective(MBO) and job rotation in HPWS, we found a strong main effect of each practice-it decreases newcomer turnover rates. This main effect becomes stronger when one practice combined with another, showing synergy exists. Linking HPWS research to turnover, this study provides insightful evidence of interactions between MBO and job rotation for organizational performance.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.203-213
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• 2021

In this study, we consider the relationship between boundaryless career attitudes and career success and the mediating effect of networking behavior. Boundaryless career attitude refers to career attitude in which career paths can gain experience in various environments beyond the fence of a single employment situation. Based on a prior research review, research hypotheses were established for the relationship between boundaryless career attitudes and subjective·objective career success. In addition, three networking behaviors, one of the social capital, were set as mediators between the two variables. Verifying the research hypothesis shows that the boundaryless career attitude and subjective career success are in a significant positive relationship and that the relationship is completely mediated by contact maintaining, friendship, and task networking behaviors. The boundaryless career attitude is a significant positibe effect with objective career success, and this relationship has been shown to be completely mediated by friendship and task networking behavior. Based on the above research results, interpretations, implications, and future research directions were presented.

• Journal of Haehwa Medicine
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• v.21 no.1
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• pp.163-174
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• 2012

Objective: The primary objective this study was to evaluate the effect of Paljeong-san (PJS) pharmacopuncture treatment on against the glycerol-induced acute renal failure in rats. Methods: Glycerol injection decreased GFR (glomerular filtration rate) and increased urine volume, serum creatinine, BUN level, urine albumine secretion and fractional excretion of Na+, K+. PJS was selected in the basis of invigorating kidney which can eliminate pathogens. Rats were treated with PJS pharmacopuncture on Shin-shu (BL23) and Chon-chu (ST25) point for 3 days, followed by 50% concentration of glycerol injection ($5m{\ell}/kg$ body weight). Results: After the 3 days treatment period, Paljeong-san (PJS) pharmacopuncture treatment improved renal function. In addition, Glycerol injection increased lipid peroxidation, and decreased Na-K-ATPase in renal cortex and which were prevented by PJS treatment. Conclusion: This study suggests that Paljeong-san (PJS) pharmacopuncture treatment show favorable effect on glycerol-induced acute renal failure in rats.