• Title/Summary/Keyword: Direct Self Control

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Self-Recurrent Wavelet Neural Network Based Direct Adaptive Control for Stable Path Tracking of Mobile Robots

  • You, Sung-Jin;Oh, Joon-Seop;Park, Jin-Bae;Choi, Yoon-Ho
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.640-645
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    • 2004
  • This paper proposes a direct adaptive control method using self-recurrent wavelet neural network (SRWNN) for stable path tracking of mobile robots. The architecture of the SRWNN is a modified model of the wavelet neural network (WNN). Unlike the WNN, since a mother wavelet layer of the SRWNN is composed of self-feedback neurons, the SRWNN has the ability to store the past information of the wavelet. For this ability of the SRWNN, the SRWNN is used as a controller with simpler structure than the WNN in our on-line control process. The gradient-descent method with adaptive learning rates (ALR) is applied to train the parameters of the SRWNN. The ALR are derived from discrete Lyapunov stability theorem, which are used to guarantee the stable path tracking of mobile robots. Finally, through computer simulations, we demonstrate the effectiveness and stability of the proposed controller.

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Relationship between Life Stress and Gambling Behavior Perceived by University Students - The mediation effects of self-control and family support -

  • Jeong, Byeong-Il;Baek, Sang-Uk
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.1
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    • pp.89-97
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    • 2017
  • This study examined the structural relationship between life stress perceived by university students and their gambling behaviors through their self-control and family support. For this, it conducted the questionnaire on life stress, self-control, family support and gambling behavior with 387 university students attending universities in Gwangju city and analyzed the data collected. The results of the analysis were described below. As a result of analyzing the direct effects of life stress on gambling behavior, self-control and family support, it was found that the life stress had the positive effect on gambling behavior and it meant that when the university students couldn't cope with the life stress effectively and felt frustrated, they were likely to be involved in gambling behavior to escape from their helplessness. In addition, as a result of analyzing the direct effects of life stress on self-control and family support, it was found that life stress had negative effect on self-control and family support. The more experiences of life stress they had, the lower their self-control was. As their life stress was higher, they didn't make supportive relationship network with family members. As a result of mediating effects, it was shown that self-control and family support played the partially negative roles in the relationship between life stress and gambling behavior and it suggested that as the life stress was perceived less, self-control was performed better and as family support was higher, gambling behavior was effectively reduced. These results of the research suggested that life stress could be handled actively through self-control and family support and development and distribution of the program to cope with life stress could minimize the gambling behaviors. Also the limitations of this study and necessity of further studies were discussed.

The Causal Relationship of Children's Behavior Problem and the Relted Variables (아동의 행동문제와 관련변인간의 인과관계)

  • 김경연
    • Journal of Families and Better Life
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    • v.17 no.1
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    • pp.155-166
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    • 1999
  • The purpose of this study was to analyze a causal relationship of children's behavior problem and the related variables(socio-economic status mother's psychological problem mother's affective parenting behavior children's negative emotionality and children's self-control). The major findings of this study were as follows: 1) Socio-economic status had indirect in influence to children's behavior problem via mother's psychological problem and mother's affective parenting behavior. 2) Mother's psychological problem had direct influence and also indirect influence to hildren's behavior problem via mother's affective parenting behavior and children's negative emotionality. 3) Mother's affective parenting behavior and children's negative emotionality had a direct effect on children's behavior problem and affected indirectly via children's self-control. 4) Children's self-control had direct influence to children's behavior problem. 5) Mother's psychological problem was the most signi icant variable affecting children's behavior problem.

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High-speed Operation of Direct Self Control method based on Torque Angle for IPMSM (토크 각 기반 Direct Self Control 기법의 매입형 영구자석 동기전동기 고속 운전)

  • Han, Byeol;Lee, June-Seok;Bak, Yeongsu;Chun, Ji-Yong;Lee, Kyo-Beum
    • Proceedings of the KIPE Conference
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    • 2020.08a
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    • pp.248-250
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    • 2020
  • 본 논문은 토크 각 기반 Direct Self Control (DSC) 기법의 매입형 영구자석 동기전동기(Interior Permanent Magnet Synchronous Motor, IPMSM) 고속 운전 방법을 제안한다. DSC 기법은 철도차량용 유도전동기에 처음으로 적용되었으며, 토크 동특성이 우수하고 약자속 영역에서 6-스텝 운전의 구현이 유리한 장점이 있다. 기존 DSC 기법으로 IPMSM을 구동하는 경우 토크 동특성이 우수하지만, 약자속 영역에서 6-스텝 운전의 성능이 떨어지는 단점이 있다. 본 논문에서는 지령 토크 각을 이용한 DSC 기법의 IPMSM 고속 운전 방법을 제안한다. 제안하는 방법의 타당성은 시뮬레이션을 통해 검증한다.

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A Hybrid DTC-DSC Drive for High Performance Induction Motor Control

  • Jidin, Auzani;Idris, Nik Rumzi Nik;Yatim, Abdul Halim Mohamed;Sutikno, Tole;Elbuluk, Malik E.
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.704-712
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    • 2011
  • This paper describes a hybrid induction motor drive system incorporating DTC-hysteresis and Direct Self Control (DSC) schemes to achieve excellent dynamic performance. The control scheme is switched from a circular to a hexagonal flux locus whenever a dynamic condition is encountered. On the other hand, when the motor operates under steady state conditions, a circular flux locus is used. Without major modifications to the simple structure of a basic DTC, hexagonal flux locus operation is established by modifying the flux error status, before it is fed to the look-up table. The feasibility of the proposed hybrid scheme to achieve excellent control performance is verified by experimental results.

The Influence of Parent-Adolescent Communication on SNS Addiction Tendency among High School Students: The Mediating Effect of Self-control (고등학생이 지각한 부모-자녀간 의사소통이 SNS 중독경향성에 미치는 영향: 자기통제력의 매개효과)

  • Kwon, Yeoeun;Lee, Jimin
    • Journal of Families and Better Life
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    • v.35 no.2
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    • pp.17-29
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    • 2017
  • The purposes of this study were to analyze the effect of perceived parent-adolescent communication on SNS addiction tendency among high school students and to investigate the mediating effects of self-control on the relationship between above variables. 567 students who were registered in three high schools located in D city completed a questionnaire on parent-adolescent communication, SNS addiction tendency, and self-control. Structural equation models were conducted to compare the research model (complete mediating effect) and the competing model (partial mediating effect), and bootstrapping was conducted to investigate the mediating effects of self-control with SPSS 23.0 and AMOS 23.0. The results are as follow: First, while the parent-adolescent communication did not directly have an effect the SNS addiction tendency, the self-control had a direct effect on the SNS addiction tendency. Second, the research model was selected as a final model which implied that parent-adolescent communication had an indirect effect on SNS addiction tendency among high school students. Third, self-control had a significant mediating effect on the relationship between parent-adolescent communication and high school students' SNS addiction tendency. Based on the results of this study, it can be concluded that parent-adolescent communication had an indirect effect rather than a direct effect through self-control on high school students' SNS addiction tendency. This result indicates that the SNS addiction tendency rate of high school student can be lowered, by mediating self-control. Finally, this study suggests that the implicit points on counseling methods to remedy self-control of high school students, and shortcomings and limits of this study and advice for follow-up studies all be discussed.

Is Health Locus of Control a Modifying Factor in the Health Belief Model for Prediction of Breast Self-Examination?

  • Tahmasebi, Rahim;Noroozi, Azita
    • Asian Pacific Journal of Cancer Prevention
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    • v.17 no.4
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    • pp.2229-2233
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    • 2016
  • Background: Breast cancer is one of the most common cancers among women in the world. Early detection is necessary to improve outcomes and decrease related costs. The aim of this study was to assess the predictive power of health locus of control as a modifying factor in the Health Belief Model (HBM) for prediction of breast self-examination. Materials and Methods: In this cross- sectional study, 400 women selected through the convenience sampling from health centers. Data were collected using part of the Champion's HBM scale (CHBMS), the Health Locus of Control Scale and a self administered questionnaire. For data analysis by SPSS the independent T test, Chi square test, logistic and linear regression modes were appliedl. Results: The results showed that 10.9% of the participants reported performing BSE regularly. Health locus of control did not act as a predictor of BSE as a modifying factor. In this study, perceived self-efficacy was the strongest predictor of BSE performance (Exp (B) =1.863) with direct effect, while awareness had direct and indirect influence. Conclusions: For increasing BSE, improvement of self-efficacy especially in young women and increasing knowledge about cancer is necessary.

The Effects of Psychological Family Environment, Self-control and Friend Characteristics of Middle School Students on Their Problem Behaviors (가족의 심리적 환경과 청소년의 자기통제력 및 친구특성이 청소년의 문제행동에 미치는 영향)

  • 남현미;옥선화
    • Journal of the Korean Home Economics Association
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    • v.39 no.7
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    • pp.37-58
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    • 2001
  • The Purpose of this study was to examine the direct or indirect effects of psychological family environment self-control, and friends characteristics of middle school students on their problem behaviors. Data were corrected from 520 senior students of middle school (266 boys and 254 girls) who reside in Inchon. The level of problem behaviors was directly influenced positively by closeness with friends and negatively by self-control and open communication with mothers. And the level of problem behaviors was indirectly influenced positively by intrafamily conflicts and negatively by self-control, parental monitoring and open communication with parents. Self-control was the most powerful predicator of problem behaviors of middle school students. Self-control was directly influenced positively by open communication with fathers and negatively by intrafamily conflicts. Closeness with friends was directly influenced positively by parental monitoring and negatively by self-control and open communication with mothers.

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Direct Thrust Control of Permanent Magnet Type Linear Synchronous Motor by using Digital Signal Processor (DSP를 이용한 영구 자석형 선형 동기전동기의 직접 추력 제어)

  • U, Gyeong-Il;Kim, Deok-Jin;Gwon, Byeong-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.8
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    • pp.514-521
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    • 2000
  • This paper presents a direct thrust control scheme for permanent magnet linear synchronous motor(PMLSM) by using digital signal processor(DSP). And a simulation method for the direct thrust control of a permanent magnet linear synchronous motor using the equivalent circuit is presented. The detent force that was obtained by cubic spline method is considered in the simulation. Thrust correction coefficient is utilized to estimate actual thrust on the direct thrust control, which considers the longitudinal end effect due to the finite core length of the permanent magnet linear synchronous motor. The motor self inductance, the initial flux linkage by the permanent magnet is calculated in advance by the finite element analysis, and then the direct control simulation is carried out. As the results, thrust, current and speed are shwon.

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Korean Adolescents' Clothing Behavior as Related to Self-Consciousness and Weight Control Practices (청소년기의 자의식 및 체중조절행동자 의복행동과의 관련연구)

  • 심정은;고애란
    • Journal of the Korean Society of Clothing and Textiles
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    • v.21 no.8
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    • pp.1334-1345
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    • 1997
  • The purpose of this study were 1) to identify the effects of age and sex of Korean adolescents on the psychological variables(body attitudes, public/private self-consciousness, self-esteem), weight control practices, and clothing behaviors, and 2) to identify the relation- ships between psychological variables and weight control practices, and the effects of the variables on clothing behaviors in the adolescent' groups classified by sex and age. The results of this study were as follows: 1) Two factors of body attitudes were identified: Body-shape consciousness and Physical attractiveness. Four factors of clothing attitudes were identified: Clothing interest/dressing for others, Clothing exhibition, Dressing for self, and Psychological clothing-dependerlce. 2) There were significant effects of sex on all of the research variables. Age was found to have effects on Physical attractiveness, self-esteem, public/private self-consciousness, Clothing exhibition, and Psychological clothing- dependence. 3) In the relationships between psychological variables and weight control practices, Body-shape consciousness was negatively correlated with Physical attractiveness in all groups. Also, Body-shape consciousness had effects on weight control practice in all subject groups. 4) Public self-consciousness had direct/indirect effects on the Clothing interest/dressing for others in all subject groups. Private self-consciousness had direct/ indirect effects on dressing for self in high school boys and girls. Body-shape consciousness had indirect effects on Preference for up-to date style in male college students group, whereas weight control practices had effects on the Preference for up-to date style in female college students group. Self-esteem was found to have the effects on clothing behavior in college students groups. Among clothing attitude factors, Clothing exhibition had distinct effects on the Preference for up-to date style in all subject groups, and Clothing interest/dressing for others had effects on Clothing exhibition and Psychological clothing-dependence in high school boys and girs.

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