• 한국염색가공학회지
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• 제20권1호
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• pp.28-35
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• 2008

Texturing is the process of including a characteristic of a natural fiber in a synthetic fiber. The most common method of it the false twist texturing. Nylon textured yarn is primarily manufactured by the disk type. The major process parameters or the disk type false twist machine ratio, disk/yarn, and heater temperature. This study therefore investigated the effects of false twist texturing, especially speed and draw ratio, on the physical properties of nylon textured yarn. The increase of speed was proportional to the increase of unwinding tension, which could reduce the production efficiency by elevating the tension affecting to fiber during the process. In addition, the increase of speed was inversely proportional to the increase of crimp rigidity of nylon textured yarn. Draw ratio was proportionally increased with the increase of tenacity and the reductions of fineness and elongation, showing the influence or draw ratio to the ultimate physical properties of textured yarn.

• 한국보건간호학회지
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• 제29권1호
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• pp.67-78
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• 2015

Purpose: The purpose of this study is to measure suicidal ideation and to investigate the affecting factors in male baby boomers using Korea Health Panel Data 2011. Methods: The Korea Health Panel Data 2011 were collected from June to December 2011 by Korea Institute for Health and Social Affairs and National Health Insurance Corporation and included 908 people who responded to the question regarding suicidal ideation. The data were analyzed by chi-square and multiple logistic regression using SPSS WIN 20.0 program. Results: The ratio of suicidal ideation was 6.1% in male baby boomers. Affecting factors of suicidal ideation in male baby boomers showed that presence of depression, frustrating experience, and regular diet had more suicidal ideation by 10.90 times (CI 5.14-23.18), 7.78 times (CI 1.98-30.51), 3.38 times (CI 1.65-6.90), respectively. Conclusion: This study is meaningful as an attempt to measure suicidal ideation and to analyze affecting factors with suicidal ideation in male baby boomers. Further study including careful and thorough examination may be needed.

• The Journal of Asian Finance, Economics and Business
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• 제7권3호
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• pp.53-62
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• 2020

The study aims to provide some plausible explanation for why Vietnamese listed companies only stop at the level of truthful presentation of information related to accounting data through the opinion of independent auditors. The information is only at the level of compliance with the requirements of Circular 155/2015/TT-BTC in form, but in essence is sketchy. What factors affect the level of voluntary disclosure of listed companies in Vietnam? In order to identify the factors affecting voluntary information disclosure on annual reports of listed companies, the study collected data on annual reports of 122 companies listed on the stock market in Ho Chi Minh City in the period 2015-2018 and uses regression analysis methods. The research presents 8 factors affecting the level of voluntary information disclosure including: Firm size, Listed time, Profitability, Solvency, Separation of board of directors and executive director, Board size, Organizational ownership and Foreign ownership. Next, the study conducted descriptive statistical analysis correlation coefficient analysis to examine the correlation and relevance of independent variables measured by the scale ratio, testing multiple linear regression model. The results of the study show that factors listed time, profitability and organizational ownership affecting voluntary information disclosure on annual reports of listed companies in Vietnam.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.767-770
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• 1999

The carbonation process is affected both by the concrete material properties such as W/C ratio, types of cement and aggregated, admixture characteristics and the environmental factors such as CO2 concentration, temperature, humidity. Based on results of preliminary research on carbonation, this study is to propose a carbonation prediction model by taking into account of prediction model by taking into account of CO2 concentration and W/C ratio among major factors affecting the carbonation process.

• 산업경영시스템학회지
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• 제19권38호
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• pp.97-104
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• 1996

This study is to empirically analyze the relevance between ownership structure and corporate value. This Study took 285 corporations listed in Korea Stock Exchange from 1990 to 1994 as samples. The result of this analysis is summerized as follows: Insider-inquiry ratio of corporation in Korea has been positively corelated with corporate value while it has been negatively corelated if the ratio is over 25%. This study intended to present desirable implications for seperating the management from ownership in Korea.

• 한국산업융합학회 논문집
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• 제9권1호
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• pp.5-11
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• 2006

This study was performed to determine the effect of structural characteristics of selected wool fabrics on mechanical and thermal properties. 52 wool fabrics, including 18 plain woven fabrics and 34 twill and satin woven fabrics were used as samples woven with various weft density for the study. Several physical characteristics such as mechanical properties, keeping warmth ratio of wool fabrics were measured. Data analyses including 1) analysis of tactile and thermal comfort sensation were performed. the following were obtained from the results: The main factors affecting keeping warmth ratio were thickness and bulk density. The keeping warmth ratio of samples increased with increasing thickness and decreasing bulk density of samples. In addition, coefficient of friction of the samples increased with keeping warmth ratio of samples. The above results show that wearing sensation and comfort properties of fabrics are changed depending on the end-use, and thus, above results can be used to manufacture of fabrics for specific end-use with high comfort properties.

• 접착 및 계면
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• 제7권4호
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• pp.45-52
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• 2006

Five low molar ratio urea-formaldehyde (LUF) resins were synthesized in this study. The effects of molar ratio, free formaldehyde content, and catalysts on the curing characteristics of LUF resins were studied by measuring its free formaldehyde content, pH value change after catalysts added, curing rate, and pot life, observing its cured appearance, and analyzing its thermal behavior. The results indicate that: 1) The LUF resin with lower molar ratio than 1.0 can still cure; 2) Free formaldehyde content is not the main factor in affecting curing rate of LUF resin; 3) Compared with ammonium chloride as a traditional catalyst, persulfate salts markedly accelerate the curing rate of LUF resin, and result in the different appearance; 4) the addition of sodium chloride to catalysts can accelerate the curing rate of LUF resin, but the effect is moderate.

• 한국생산제조학회지
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• 제6권3호
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• pp.58-64
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• 1997

A micromechanics model to describe the elastic behavior of fiber or whisker reinforced metal matrix composites was developed and the stress concentrations between reinforcements were investigated using the modified shear lag model with the comparison of finite element analysis (FEA). The rationale is based on the replacement of the matrix between fiber ends with the fictitious fiber to maintain the compatibility of displacement and traction. It was found that the new model gives a good agreement with FEA results in the small fiber aspect ratio regime as well as that in the large fiber aspect ratio regime. By the calculation of the present model, stress concentration factor in the matrix and the composite elastic modulus were predicted accurately. Some important factors affecting stress concentrations, such as fiber volume fraction, fiber aspect ratio, end gap size, and modulus ratio, were also discussed.

• 보건행정학회지
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• 제20권4호
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• pp.114-125
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• 2010

Objectives : This study investigates the determinants of contingent workers' ratio in public health centers. Since the economic crisis in 1997, there have been many studies on contingent workers in Korea. But, previous studies have been not conducted focusing on public health center. Methods : This study used 253 public health centers, installed and operated since December 31, 2008. in Korea as units of analysis. To examine the determinants of contingent workers' ratio, this study uses Pearson correlation and multiple regression analysis. Results : The following appeared as significant variable affecting contingent workers' ratio in public health centers; degree of the local government's financial independence(p<0.001), rate of increase/decrease in ages 65 and over(p<0.001), rate of increase/decrease in basic livelihood security recipients(p<0.01) and rate of increase/decrease in registered disabled persons(p<0.01). In contrast, internal organizational environment characteristics related variables were not statistically significant. Conclusions : Contingent workers' ratio in public health center is significantly affected by financial vulnerability of the local government and increase in demand of health care services.

• The Journal of Asian Finance, Economics and Business
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• 제9권4호
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• pp.197-212
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• 2022

The study uses the audited financial statements of 26 Vietnamese commercial banks listed on the Ho Chi Minh City Stock Exchange (HOSE) and Hanoi Stock Exchange (HOSE) during the 2008-2018 period to estimate the system GMM model, which provides empirical evidence on the effect of the variables of customer deposit to total assets (DEPO) ratio, loan to assets (LTA) ratio, liquidity of commercial banks (LIQ), credit development (CRD) ratio, external funding (EFD) ratio, and credit loss provision (LLP) ratio on liquidity risk. The study confirms that commercial banks' internal factors play the most important role, and there is no empirical evidence on macro variables that affect liquidity risk. Finally, in accordance with the theoretical framework, the study uses an estimation method with the R language and the bootstrap methodology to give empirical proof of the nonlinear correlation and U-shaped graph between commercial bank size and liquidity risk. The importance of commercial bank size in absorbing and moderating the effects of liquidity shocks is demonstrated, however, excessive growth in commercial bank size would increase liquidity risk in commercial bank operations.