• 한국산업정보학회논문지
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• 제4권3호
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• pp.79-88
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• 1999

적응 신호처리 분야에서 LMS(Least Mean Square)알고리즘은 그 식의 간편함과 구현의 용이함으로 가장 널리 이용되고 있다. 대부분의 LMS 알고리즘은 수렴비를 조절하는 적응계수를 일정한 값으로 정하는데, 이는 안전성과 속도사이에서 트레이드오프가 존재한다. 이러한 단점을 해결하고 성능을 개선하기 위하여 가변 LMS(VLMS: Variable LMS)가 발표되었다. 그러나 기존에 발표된 알고리즘들은 급격한 환경변화에 적응하지 못하고 발산하는 경우도 있으며 수렴속도에 문제가 있다. 본 논문에서는 기존의 적응계수의 특성을 일부 변형시킴으로서 계산량을 줄이고, 급격한 환경변화에서도 수렴하도록 하는 새로운 알고리즘을 제안하였다. 제안한 적응계수의 성능 확인을 위하여 시스템 식별 및 잡음 제거 시스템에 적용하여 기존의 알고리즘들과 비교하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제17권2호
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• pp.7-16
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• 2011

The death toll of the elderly by accidents in 2007 takes 6.5% of total death toll. The lost income from this is estimated to be 17 trillion and 511 billion won. According to CISS of Korea Consumer Protection Board, the number of safety related accidents of the elderly at home in 2006 was 486 cases in 2006 and has gradually increased every year. This thesis created 115 guidelines at 14 spaces as facility evaluation index evaluating the aging friendliness of the facility and safety related accidents generated at elderly resident welfare facility, examined influence variables of safety related accidents with 191 elderly including demographic variable, physical skill variable, social psychological variable and facility environmental variables, and then verified relevance between safety accidents and each influence variable. As a result, it was verified through ANOVA test of SAS Package Program and $x^2$- test that facility environmental variable would be closely related to the accident. In this regard, this study newly proposes the facility standards of aging friendly facility by supplementing them with contents and guidelines of facility evaluation table as ways to reduce safety related facility of the elderly.

• ETRI Journal
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• 제25권4호
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• pp.258-265
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• 2003

In our study, we extracted the market, finance, and government factors determining R&D investment of individual firms in the IT industry in Korea. We collected the financial data of 515 individual firms belonging to IT and non-IT industries between 1980 and 1999 from the Korea Investors Service's database and investigated the empirical relationship between the factors using an ordinary regression model, a fixed effects model, and a random effects model. The main findings of our study are as follows: i) The Herfindahl Index variable representing the degree of market concentration is statistically insignificant in explaining R&D expenditures in the IT manufacturing industry. ii) Assets, which is used as a proxy variable for firm size, have a positive and statistically significant coefficient. These two results suggest that the Schumpeterian Hypothesis may be only partially applied to the IT manufacturing industry in Korea. iii) The dividend variable has a negative value and is statistically significant, indicating that a tendency of high dividends can restrict the internal cash flow for R&D investment. iv) The sales variable representing growth potential shows a positive coefficient. v) The subsidy as a proxy variable for governmental R&D promotion policies is positively correlated with R&D expenditure. This suggests that government policy has played a significant role in promoting R&D activities of IT firms in Korea since 1980. vi) Using a dummy variable, we verified that firms reduced their R&D investments to secure sufficient liquidity under the restructuring pressure during Korea's 1998 and 1999 economic crisis.

• 유통과학연구
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• 제15권9호
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• pp.53-62
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• 2017

Purpose - This study aims to analyze the effects of preference for Korean Wave and heuristic on shopping satisfaction and switching barriers of Chinese people visiting Korea, and also their positive effects on consumers' behavioral intention with these variables as mediating variables by using the structural equation model. Research design, data, and Methodology - For this study, we collected 264 questionnaires of Chinese consumers' who have experienced tourism and shopping in Korea after excluding questionnaires that were not proper to be analyzed. The residence of Chinese visiter was Shandong Province, Beijing, Shanghai, Shenyang. The data of this study was analyzed using SPSS 23 statistics to verify the reliability and discriminant validity. Structural equation method was used to test the hypotheses in this study. Results - The effects of heuristic variable on shopping satisfaction and the switching barriers variable were statistically significant. The effects variables of Korean Wave effect variable were statistically significant only on the switching barriers variable. However, the Korean Wave effect variable did not have a statistically significant effect on the shopping satisfaction. Conclusions - The shopping satisfaction and Korean Wave effect variables had statistically significant effects on the behavioral intention variable. In the result of indirect analysis, only the heuristic effect had indirect effects on consumers' behavior intention.

• 품질경영학회지
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• 제37권2호
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• pp.46-57
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• 2009

The traditional approach to economic design of control charts is based on the assumption that a process is monitored using a performance variable. However, various types of automatic test equipments recently introduced as a part of factory automation usually measure surrogate variables instead of performance variables that are costly to measure. In this article we propose a model for economic design of a control chart which uses a surrogate variable that is highly correlated with the performance variable. The optimum values of the design parameters are determined by maximizing the total average income per cycle time. Numerical studies are performed to compare the proposed $\bar{X}$ control charts with the traditional model using the examples in Panagos et al. (1985).

• 동아시아경상학회지
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• 제8권3호
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• pp.25-36
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• 2020

Purpose - As the interest of financial aria increase in economic change and labor market change, this study focused on the employee of the financial aria in Korea. The purpose of this study is to analyses relation among relationship variable and organizational culture variable and organizational effectiveness of financial aria employees in Korea. Research design, data, and methodology - This study measured relationship variable with communication and trust. And measured organizational culture variable with innovation, relation, hierarchy and rational. And measured organizational effectiveness with job satisfaction and organizational commitment. Empirical analysis is conducted using 442 financial aria employees of 7th HCCP in KRIVET. And SPSS is used in frequency and stepwise regression test and AMOS is used in path analysis with group differentiation test. Results - Overall results show that trust and relation culture give positive influence on job satisfaction. Organizational commitment results show that relation culture and rational culture give positive influence and also job satisfaction. However, hierarchy culture gives negative influence on organizational commitment. Also, the moderating effect of work characteristics is significant. Conclusions -Result of this study give managerial implication to HRM and also expend inflected organizational culture study to financial aria in Korea. Especially gives insight to relationship, organizational culture and organizational effectiveness. And management differentiation needs between work characteristic.

• Journal of Information Processing Systems
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• 제15권5호
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• pp.1131-1140
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• 2019

Characteristics of fruit tree canopies are important target information for adjusting the pesticide application rate in variable rate spraying in orchards. Therefore, the target detection of the canopy characteristics is very important. In this study, a canopy volume measurement method for peach trees was presented and a variable rate spraying system based on canopy volume measurement was developed using the ultrasonic sensing, one of the most effective target detection method. Ten ultrasonic sensors and two flow control units were mounted on the orchard air-assisted sprayer. The ultrasonic sensors were used to detect the canopy diameters and the flow controls were used to modify the flow rate of the nozzles in real time. Two treatments were established: a constant application rate of $300Lha^{-1}$ was set as the control treatment for the comparison with the variable rate application at a $0.095Lm^{-3}$ canopy. The tracer deposition at different parts of peach trees and the tracer losses to the ground (between rows and within rows) were analyzed in detail under constant rate and variable rate application. The results showed that there were no significant differences between two treatments in the liquid distribution and the capability to reach the inner parts of the crop canopies.

• The Journal of Asian Finance, Economics and Business
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• 제8권2호
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• pp.1033-1041
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• 2021

Consumptive behavior is the behavior of consuming goods that are actually less or not needed (especially in relation to the response to the consumption of secondary goods, namely, goods that are not really needed). This study aims to determine the influence of factors such as lifestyle, financial literacy, and social demographics on the consumptive behavior. The population in this research is students of STIE Bank BPD Jawa Tengah who had taken entrepreneurship I and II courses, with a total of 230 students, while the sample is determined by using accidental sampling technique and using Slovin formula, which obtained 70 samples. Quantitative data are used, and data collection method in this study is questionnaire. The analytical tool in this study is the multiple regression analysis. Data is processed by using the SPSS program 21. The results showed that there were positive influence of lifestyle variable on student consumptive behavior; positive influence of financial literacy variable on student consumptive behavior; and positive influence of social demographics on student consumptive behavior. The most dominant variable influencing consumptive behavior is variable X3 (social demographics) with a regression coefficient value of 0.510, followed by variable X1 (lifestyle) and variable X2 (financial literacy).

• 한국경영과학회지
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• 제21권1호
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• pp.163-170
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• 1996

An errors-in-variables model (EVM) differs from the classical regression model in that in the former the independent variable is also subject to error. This paper shows that to assess the applicability of the ordinary least squares (OLS) estimation procedure to the EVM, the relative dispersion of the independent variable to its error variance must be also considered in addition to Mandel's criterion. The effect of physically reducing the variance of errors in the independent variable on the performance of the OLS slope estimator is also discussed.

• 한국경영과학회지
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• 제39권1호
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• pp.1-12
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• 2014

This article proposes a variable sampling interval (VSI) $\bar{X}$ control chart using weighted standard deviation (WSD) method for skewed populations. The WSD method decomposes the standard deviation of a quality characteristic into upper and lower deviations and adjusts control limits and warning limits of a control chart in accordance with the direction and degree of skewness. A control chart constant is derived for estimating the standard deviation of skewed distributions with the mean of sample standard deviations. The proposed chart is compared with the conventional VSI $\bar{X}$ control chart under some skewed distributions. Simulation study shows that the proposed WSD VSI chart can control the in-control average time to signal (ATS) as an adequate level better than the conventional VSI chart, and the proposed chart can detect a decrease in the process mean of a quality characteristic following a positively skewed distribution more quickly than the standard VSI chart.