• Title/Summary/Keyword: Related variable

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A Learning Method of PID Controller by Jacobian in Multi Variable System (다변수 시스템에서 자코비안을 이용한 PID 제어기 학습법)

  • 임윤규;정병묵
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.112-119
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    • 2003
  • Generally, PID controller is not suitable to control multi variable system because it is very difficult to tune the PID gains. However, this paper shows that it is not hard to tune the PID gains if we can find a Jacobian matrix of the system. The Jacobian matrix expresses the ratio of output variations according to input variations. It is possible to adjust the input values in order to reduce the output error using the Jacobian. When the colt function is composed of error related terms, the gradient approach can tune the PID gains to minimize the function. In simulation, a hydrofoil catamaran with two inputs and two outputs is applied as a multi variable system. We can easily get the multi variable PID controller by the proposed teaming method. When the controller is compared with LQR controller, the performance is as good as that of LQR controller with a modeling equation.

A New Interpretation Approach using Tobit Analysis : Simulations based on Type I Tobit of Amemiya - Focused on Childcare Services -

  • Park, Sun-Young
    • Journal of Families and Better Life
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    • v.19 no.6
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    • pp.145-155
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    • 2001
  • The purposes of this study were first to construct statistical and econometric models based on Amemiya\`s Type I Tobit mainly addressing the issue of statistical efficiency; second to explore income, price, and curvilinear age effects on the explained variable in order to illustrates its statistical marginal effects related to econometric issues; finally to provide invaluable insight for graphical simulations as a new interpretation approach using Tobit analysis. Results indicated that interpretation for the mean marginal effects of three possible cases of dependent variable was more likely to be evident to understand Tobit results compared to conventional analysis only using latent variable, beta. Results also revealed that prediction value of dependent variable can be possibly and easily projected by the independent variable changed whereas only beta value can not illustrate its projection as independent variables'changes.

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A study on the peer acceptance of children and related variables (아동의 또래 수용도 및 관련변인)

  • Lee, Sook;Chung, Mi-Ja
    • Journal of the Korean Home Economics Association
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    • v.33 no.2
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    • pp.103-112
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    • 1995
  • The purpose of this study was to examine the peer acceptance of children as a function of children's behavioral traits, mother- and father- child attachment and family-related variables. The sample was consisted of 224 5th grade children from elementary school in Kwang-ju. Data were gathered through questionnaires of peer acceptance, behavioral assessment, mother- and father-child attachment, and family- related variable. The results show that the children's behavioral traits, mother-child attachment, and the sibling's being has the significant differences on the peer acceptance of children. Among these variables, prosocial behavior was the most significnat variable.

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A Study on the Family Attitude toward Mental Illness (정신질환자 가족들의 정신질환에 관한 태도 조사연구)

  • 조영숙
    • Journal of Korean Academy of Nursing
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    • v.11 no.1
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    • pp.7-17
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    • 1981
  • The purpose of this study is to investigate the relationship between family attitude about mental illness and their general characteristics. The subjects for this study were a sample of 120 families selected from psychiatric ward of one university hospital, which is one national hospital in Seoul. Data was collected from July 1th to August 10th in 3980 used by Opinion about Mental Illness Scale (O.M.I.). The materials were analized by S.P.S.S. program. The findings of the study were as follows: A. Families' attitude toward mental illness shown ay this study was more negative compared to those of Korea1 nursing professorss, nurses and nursing students. B. Variables which influence families' attitude about mental illness: 1. There is no significant between general characteristics and authoritarianism. (p> 0.05) 2. Benevolence (Factor B) was found to be significantly related to such variables as religion, eucation levels, existence of mental patient in their an intimate friends. (P < 0.01) Families' attitude about benevolence was mere positive in families who have not relegion or having christion beliefs: haying the higher education levels; not having a mental patient in their an intimate friends. 3. Mental health ideology (Factor C) was found to be significantly related to variable experience of mental illness. (P < 0.01). families' attitude about mental health ideology was more positive in families who had experience of mental illness. 4. Social Restrictiveness (Factor D) was found to be significantly related to variable relationship between families and patients(P<0.01). An intimate friend's attitude about mental health Ideology was mon positive than that of parent and couple. 5. Interpersonal Etiology (Factor E) was found to be significantly related to variable religion (P < 0.05). Families' attitude about interpersonal etiology was more positive in families who have relegion.

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A Meta analysis of variables related to Burnout of nurse in korea (국내 간호사의 소진과 관련된 변인의 메타분석)

  • Kim, Sin-Hayng;Yang, Yoon-Seo
    • Journal of Digital Convergence
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    • v.13 no.8
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    • pp.387-400
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    • 2015
  • The purpose of this study is to identify the effect size of protective variables and risk variables based on the previous study which is related to nurse burnout. Master's doctoral and journal degrees from 2005 to 2014, a total of 116 articles side by conducting a meta-analysis suggests a convergence conclusions. The biggest effect size of a nurse burnout protection variable was job variable and the largest effect sized of sub-variable was empathy satisfaction. The biggest effect size of the nurse burnout risk variables was organization variables, the largest effect size of sub variables was the violent reaction. Based on the results of this research, a variety of programs and policy measures for appropriate interventions and arbitration of nurse burnout should be built to decrease the risk variable which can cause nurse burnout and reinforce the protection variable that restrains a nurse burnout.

Analysis of the Efficiency of the Traditional Market's CRM Activities (전통시장의 고객관계관리 전략(CRM)에 대한 효율성 분석)

  • Kim, Soon-Hong;Yoo, Byoung-Kook
    • Journal of Distribution Science
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    • v.11 no.5
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    • pp.43-53
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    • 2013
  • Purpose - The purpose of this study is to analyze the effectiveness of customer relationship management (CRM) support policies for facilitating traditional markets, especially with respect to customer acquisition and maintenance, and to investigate the factors affecting CRM. Research design, data, and methodology - We analyzed the CRM efficiency of traditional markets in 16 cities and provinces in Korea on the basis of DEA analysis and Malmquist productivity analysis. The DEA model calculates a ratio of the weighted mean of various inputs to the weighted mean of various outputs and measures the efficiency of a specific decision making unit (DMU), which is compared to the reference group that has a similar input-output structure. The input variables are coupon, event, parcel service, premiums, while is the number of customers per day. Further, through regression analysis, we analyzed CRM-related factors affecting traditional markets' customer appeal and revenue growth. Results - We obtained the results of the efficiency of traditional markets in 16 provinces. The traditional markets in Seoul, Busan, and Jeju were found to be efficient in a model CCR that used the number of customers per day as an output variable, while Chungbuk, Jeonbuk Province, and According to the results of the DEA analysis and Malmquist productivity analysis, large cities such as Seoul, Busan, and Jeju showed efficiency in CRM-related investment businesses in traditional markets for attracting customers. The Malmquist analysis results confirmed that the productivity of traditional markets increased from 2008 to 2010. The results of the regression analysis revealed that the "customer acquisition/maintenance factor" and the "offering of customer convenience facility factor" were significant to the daily average number of customers, which is a dependent variable. The results of the test with the mediating variable, "number of customers," and the final dependent variable, "sales revenue," were rejected. However, the variable "customer acquisition /maintenance" was found to affect sales revenue positively. Conclusions - It is necessary to enhance the business not only for promotional activities to attract customers, but also to strengthen customer relationships among CRM businesses, such as through the management of key customers. The regression analysis results showed that CRM businesses have yet to produce an increase in sales revenues in traditional markets. Therefore, to help customers who visit traditional markets to keep buying products, it is necessary to prepare various investment methods and provide support to improve "customer loyalty." This study has a limitation in terms of CRM-related statistics. Therefore, in the future, it is necessary to conduct a survey of customers who use traditional markets to analyze the markets by type and size as well as the CRM-related factors. Based on the analysis, we will try to perform a variety of statistical analyses, including structural equations.

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A Variable Window Method with Three-Dimensional Disparity Space (삼차원 변이 공간을 이용한 가변윈도우법)

  • 김경범;이홍서
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.284-287
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    • 2003
  • Previous stereo methods doesn't deal effectively with depth discontinuity due to inevitable window-based problems, and so give inaccurate and noisy matching results in areas with steep disparity variations. In this paper. a variable window approach is presented to estimate accurate, detailed and smooth disparities with three-dimensional disparity space. It makes the smoothing of depth discontinuity reduced by evaluating corresponding correlation values and intensity gradient-based similarity in the space. In addition, it devises the novel arbitrarily-shaped variable window to treat with disparity variations of various structure shapes. We show how our results improve on those of closely related techniques for accuracy, robustness. matching density and computing speed.

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Electro-elastic analysis of functionally graded piezoelectric variable thickness rotating disk under thermal environment

  • Arefi, Mohammad;Moghaddam, Sina Kiani
    • Structural Engineering and Mechanics
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    • v.71 no.1
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    • pp.23-35
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    • 2019
  • In this study we derive the governing equations of a functionally graded piezoelectric disk, subjected to thermo-electro-mechanical loads. First order shear deformation theory is used for description of displacement field. Principles of minimum potential energy is used to derive governing equations in terms of components of the displacement field and the electric potential. The governing equations are derived for a disk with variable thickness. The numerical results are presented in terms of important parameters of the problem such as profile of variable thickness, in-homogeneous index and other related parameters.

Development of 3D scanner using structured light module based on variable focus lens

  • Kim, Kyu-Ha;Lee, Sang-Hyun
    • International Journal of Advanced Culture Technology
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    • v.8 no.3
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    • pp.260-268
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    • 2020
  • Currently, it is usually a 3D scanner processing method as a laser method. However, the laser method has a disadvantage of slow scanning speed and poor precision. Although optical scanners are used as a method to compensate for these shortcomings, optical scanners are closely related to the distance and precision of the object, and have the disadvantage of being expensive. In this paper, 3D scanner using variable focus lens-based structured light module with improved measurement precision was designed to be high performance, low price, and usable in industrial fields. To this end, designed a telecentric optical system based on a variable focus lens and connected to the telecentric mechanism of the step motor and lens to adjust the focus of the variable lens. Designed a connection structure with optimized scalability of hardware circuits that configures a stepper motor to form a system with a built-in processor. In addition, by applying an algorithm that can simultaneously acquire high-resolution texture image and depth information and apply image synthesis technology and GPU-based high-speed structured light processing technology, it is also stable for changes to external light. We will designed and implemented for further improving high measurement precision.

Antecedents and Outcome Variable and Mediating Effects of Continuous-Related Career Learning (지속경력학습의 선행 및 결과변인과 매개효과)

  • Ji, Sung-Ho
    • The Journal of the Korea Contents Association
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    • v.15 no.8
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    • pp.564-578
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    • 2015
  • The present study is aimed to investigate antecedents(person-job fit, human capital investment) and outcome variable(subjective career success) of continuous-related career learning, and to demonstrate mediating effects of continuous-related career learning. The data which was applied to analysis was collected from 241 office workers who have worked for automobile company in Ulsan and public companies in Jeju and applied temporal separation of measurement as an alternative for common method bias. The results are as follows. First, person-job fit, human capital investment affected to career-related continuous learning positively. Second, the impacts of career-related continuous learning to subjective career success was positively significant. Third, the mediating effects by career-related continuous learning demonstrated statistically significant in the links between antecedents-outcome variables as partial mediation. Implications of this study contribute to expand research area of continuous-related career learning with regard to job and organizational variables, and to facilitate of research interests on subjective career success. In addition, the mechanism of career advance was empirically proved by continuous-related career learning.