소비자 비만관리 행동에 있어 자아개념과 주관적 규범의 영향 및 자기통제감의 조절변수적 영향

정형식,김영심 한국마케팅학회 2006 ASIA MARKETING JOURNAL Vol.8 No.3

It is frequently observed that consumers' behavior and performance in their weight control are greatly affected by the degree of self-control by the consumers themselves. In other words, effective weight control behavior is only possible when the consumers invest a substantial amount of endeavors and self-control. The present study empirically investigated the effect of the self-image congruence and subjective norm formed by self- concept reflected in weight control behavior on weight control attitude formation, actual behavior, and performance. For more in-depth research, rather than simply showing differences in performance based on self-control, the present study divided the subjects into high and low self-control groups for a comparative purpose.Based on empirical research employing general consumers and those who were engaged in an actual weight loss program at professional weight control centers as subjects, the study found the following results: First, for both high and low self-control groups, self-image congruence significantly affected attitude toward weight control, but not the actual weight control behavior. The results indicate that in weight control, the actual behavior must be preceded by the attitude. Second, subjective norm directly affected both attitude toward weight control, and behavior for the low self-control group while it affected the behavior only for the high self-control group. The results show that the lower self-control is, the more powerful the effect of referents is. Third, weight control attitude positively affected weight control behavior only for the high self-control * Professor, Division of Business, Chosun University 소비자의 비만관리 행동 및 성과는 소비자 자신의 통제정도에 따라 크게 차이가 난다는 것이 일반적으로 관찰된다. 실제 비만관리 성과는 소비자 자신이 상당한 정도의 자기 노력과 통제를 투입해야만 달성된다. 본 연구는 자기통제감에 따른 단순한 성과의 차이만을 보기보다는 자기통제감을 고․저집단으로 분류하여 비만관리 행동상의 자아개념을 통한 자아이미지 일치감 및 주관적 규범이 비만관리의 태도형성과 행동 및 성과에 미치는 인과관계 과정을 실증적으로 검증하였다. 일반소비자와 실제 전문적인 비만관리 시설에서 비만관리를 하고 있는 소비자를 대상으로 실증분석한 결과는 첫째, 자기통제감 고․저집단 모두에서 자아이미지 일치감은 비만관리의 태도형성에 유의한 영향을 미치는 것으로 나타났으나 비만관리 행동에는 유의한 영향을 미치지 않는 것으로 나타났다. 이에 소비자의 비만관리 행동은 태도를 형성하지 않고는 직접적으로 행동을 이끌지 못하는 것을 알 수 있다. 둘째, 자기통제감 저집단에서는 주관적 규범이 비만관리의 태도 및 비만관리 행동에 모두 직접적인 영향을 미치는 것으로 나타났으나 자기통제감 고집단은 주관적 규범이 비만관리 행동에만 유의한 영향을 미치는 것으로 나타나, 자기통제감이 낮을수록 가까운 준거인들의 영향력이 크다는 것을 보여주고 있다. 셋째, 자기통제감 고집단만이 비만관리의 태도가 비만관리 행동에 긍정적 영향을 미치는 것으로 나타났다. 넷째, 자기통제감 고․저집단 모두에서 비만관리 행동이 비만관리 성과에 유의한 영향을 미치는 것으로 나타났다. 이들의 상대적 영향력을 비교한 결과, 자기통제감 고집단이 저집단보다 더 큰 영향력을 나타내 소비자의 비만관리 행동의 성과를 높이기 위해서는 자기통제감의 역할이 크다는 것을 알 수 있다. 한편 자기통제감 저집단은 준거인의 역할이 상대적으로 중요하다는 것을 시사하고 있다.

유아의 자기조절력과 스마트폰 과의존과의 관계에서 어머니 양육태도의 매개효과

허경선,이희영,최태진 부경대학교 인문사회과학연구소 2023 인문사회과학연구 Vol.24 No.3

The purpose of this study was to investigate the mediating effect of mothers' parenting attitudes on the relationship between early children's self control and over dependence on smartphone. To this end, the following study questions were established. For this study, questionnaires measuring the early children's self control, over dependence on smartphone, and mothers' parenting attitudes were completed by 430 mothers of three, four, and five-year-olds in Metropolitan city A and B city. Collected data were analyzed using the IBM SPSS (ver. 24) program and Hayes' PROCESS Macro. The results of this study were as follows: First, the total score of early children's self control and over dependence on smartphone is r=-.37. It had a negative correlation. Second, based on early children's over dependence on smartphone, the mother's rejective parenting attitudes with a static correlation of r=.32, autonomous parenting attitudes with a negative correlation of r=.-25, affectionate parenting attitudes with a negative correlation of r=.-22. On the other hand, On the other hand, it was found that there was little relationship between the mother's controlled parenting attitude and children's over dependence on smartphone(r=.11). Third, early children's self control tended to be high when the mother's parenting attitude was affectionate (r=.39), or autonomous(r=.41). However, when the mother's parenting attitude is particularly rejected, early children's self control may be greatly degraded (r=-.45). According to the research model, a series of regression analysis was performed by setting the early children's self control(X) as an independent variable, and the early children's over dependence on smartphone(Y) as a dependent variable and the mother's parenting attitude(M) as a parameter. As a result, it could be seen that the mother's rejective parenting attitude and autonomous parenting attitude had a mediating effect in the relationship between the early children's self control and over dependence on smartphone. And as a result of regression analysis, the indirect effect is significant for rejective parenting attitude and the autonomous parenting attitude. This study is meaningful in that it revealed the mediating effect of mothers' parenting attitudes in the relationship between early children's self control, early children's over dependence on smartphone. In addition, the study is meaningful in that not only personal variables of early children, but also environmental variables were integrally considered in identifying the path through which early children's become overdependent on smartphones. 본 연구의 주 목적은 유아의 자기조절력과 스마트폰 과의존과의 관계에서 어머니 양육태도의 매개효과를 살펴보는 것이었다. 이를 위해 광역시 A와 B시에 소재하고 있는 유치원 과 어린이집에 재원중인 만 3~5세 430명의 유아와 이들의 어머니를 대상으로 자료를 수집하였다. 수집된 자료는 상관분석과 회귀분석 및 Hayes(2013)의 PROCESS Macro를 사용하여 분석하였다. 연구의 주요 결과를 다음과 같다. 유아의 자기조절력, 스마트폰 과의존, 어머니 양육태도 간 상관관계를 살펴본 결과로첫째, 유아의 자기조절력과 스마트폰 과의존 간 상관관계를 살펴본 결과 부적상관이 있는 것으로 나타났다. 둘째, 유아의 스마트폰 과의존과 어머니 양육태도 간의 관계를 살펴본 결과 어머니 양육태도가 무엇이냐에 따라 상관의 크기와 방향에서 뚜렷한 차이가 나타났다. 양육태도가 애정적이거나, 자율적일수록 유아의 스마트폰 과의존적 성향은 낮았으며, 양육태도가 거부적일수록 유아의 스마트폰 과의존적 성향 또한 높았다. 한편, 통제적 양육태도와 스마트폰 과의존 간에는 유의미한 관계가 발견되지 않았다. 셋째, 유아의 자기조절력과 어머니 양육태도 간 상관관계를 살펴본 결과 어머니 양육태도가 무엇이냐에 따라 상관의 크기와 방향에서 차이가 나타났다. 유아의 자기조절력과 스마트폰 과의존과의 관계에서 어머니 양육태도의 매개효과를 살펴본 결과로 , 거부적 양육태도와 자율적 양육태도가 유아의 자기조절력과 스마트폰 과의존과의 관계에서 매개 효과를 갖는 것으로 나타났다. 이러한 결과는 스마트폰을 과하게 사용하는 유아들의 행동을 자기조절력을 통해 개선하고자 하는 노력이 별다른 효과를 얻지 못할 경우 어머니의 양육태도 개선을 시도해 볼 수 있음을 시사한다. 본 연구는 유아의 자기조절력, 스마트폰 과의존, 어머니 양육태도 간의 상관관계 및 유아의 자기조절력과 스마트폰 과의존과의 관계에서 어머니 양육태도의 매개효과를 밝혔다는 데 그 의의가 있다.

Attitude Optimization Control Method of Agile Optical Small Satellite for Nonparallel Ground Track Imaging

Guo-Wei Fan,Xue-Ying Lv,Ying Song,Huan-Yu Zhao,Liu Zhang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8

Nonparallel ground track imaging of optical remote sensing satellite is an efficient imaging mode which could realize one-time transit imaging of complex observation tasks due to its fast and flexible imaging capability, and has attracted more attentions in the earth observation field recently. In this paper, an off-line attitude trajectory planning and on-line moving horizon attitude tracking control scheme based on optimal control idea is designed to satisfy the imaging requirement of high-performance attitude control oriented to nonparallel ground track imaging. Considering the entire satellite attitude adjustment of the drift angle, based on the geometric relationship of sapce vectors and the coordinate transformation principle, the three-axis attitude calculation of the precise pointing of key feature targets in the interested ground curve strip is conducted. Taking the attitude orientation as the constraint, the pseudospectral method is used following the established agile satellite control model to design the optimal trajectory of the attitude manever and the feedforward control torque of actuator for nonparallel ground track imaging. A moving horizon tracking control law based on the nonlinear error control model is designed to realize the highprecision attitude tracking control. The feasibility and effectiveness of the proposed control scheme are illustrated by numerical and imaging simulations.

시간 최적화 성능지수를 고려한 유도탄 자세제어 기법 연구

문관영,김성준,전병을 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

수직 발사관을 이용하여 사출되는 유도탄의 경우 급격한 초기 회전이 수행되어야 하는 교전 기하가 발생한다. 이를 해결하기 위해 본 논문에서는 유도탄 자세제어 기법에 대한 연구를 수행하였다. 추진제 연소에 따른 제트베인의 비 정형적 삭마에 대응하기 위해, 빠른 응답속도를 갖는 자세 제어 기법이 요구된다. 시스템 모델링에 대해 소개하고, 안정적인 피치, 요 방향 제어를 위해 설계한 기본 제어기 구조에 대한 설계 기법을 정리하였다. 이후 급속 롤 자세제어를 위해 성능지수를 제어 종료 시간으로 하는 뱅뱅(Bang-Bang) 최적해를 유도하였으며, 이의 적용기법에 대해 고찰하였다. 설계된 자세제어기를 비선형 시뮬레이션에 적용하여 설계된 제어기의 타당성을 검증하였다. To perform abrupt attitude control for initial phase of flight, attitude control scheme is studied. Firstly, the pitch and yaw dynamics is introduced for composing the attitude controller. The classical 3 loop attitude structure is adopted for the basic pitch and yaw control. During the intial maneuver, the vane erosion problem arises. To cope with this phenomenon, fast maneuver for the roll is required for the attitude control system; Time optimal solution, bang-bang control is applied to the roll attitude loop. Based on the phase diagram between roll and roll rate, the roll fin is switched to achieve the control goal. Numerical simulation is performed to check the validity for the proposed algorithm.

A Hardware Implementation of Flexible Attitude Determination and Control System for Two‑Axis‑Stabilized CubeSat

Khaled Gaber,Mohamed B. El Mashade,Ghada A. Abdel Aziz 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2

This paper presents a hardware implementation of fexible and low-cost attitude determination and control system (ADCS) for two-axis-stabilized CubeSat. As small satellite missions are increasing, the CubeSat requires precise ADCS with attitude drift adjustment. This attitude drift if not properly compensated, will cause a slow attitude information loss as the error in attitude rises between the actual and estimated signals. The proposed ADCS comprises two steps; the attitude determination which estimates the current CubeSat’s attitude and a novel simplifed intelligent proportional-integral control algorithm that accurately adjusts the attitude. The control algorithm is based on the multi degree-of-freedom controller concept and has no controller gains parameters. The proposed ADCS employs sun sensor, magnetometer, and a micro-electro-mechanical gyroscope sensor to correct the attitude drift by ofering a comparative attitude that is utilized for updating the estimated attitude delivered to the Kalman flter for determining the CubeSat’s attitude and angular velocity. The ADCS model verifcation and validation are accomplished via Matlab/Simulink and hardware implementation. A comparison with other ADCS techniques is presented. The ADCS simulated model demonstrates precision results with error of less than 0.1°.

고등학생이 지각한 부모의 양육태도와 스마트폰 중독 간 관계에서 자기통제력의 매개효과

진은희,이경순 한국교육정보미디어학회 2017 교육정보미디어연구 Vol.23 No.4

Adolescents spend hours every day using their smartphones. Yet problematic smartphone use is getting an increasing amount of attention due to the popularity of mobile phone in recent years. The purpose of this study is to examine the mediating effects of self-control in the relationship between perceived parenting attitude and smartphone addiction. 283 highschool students, who uses smartphones, have completed questionnaires, assessing their perception of parents attitude, self-control, and smartphone addiction. Parenting attitude could be defined as the general attitude of parents when they were raising a child. Monitoring, affection and reasoning parenting are classified as a positive attitude and, on the contrary, inconsistency, overexpectation and intrusiveness parenting are classified as a negative attitude. Results are as follows: First, the positive parenting attitude had a negative influence on smartphone addictions but positive effects on self-control. The correlation was reversed on negative parenting attitude. Second, self-control was found to mediate the relationship completely between parenting attitudes and smartphone addiction. That is, rather than parenting attitude having a direct effect on smartphone addiction, the self-control resulting from the parenting attitude had an affect on smartphone addiction. The result provides evidence on close association between parenting attitude and problematic smartphone use, indicating the mediation role of self-control. Based on the results, further implications are provided to reduce adolescents’ smartphone addiction. Possible directions for future research were also suggested. 이 연구는 고등학생이 지각한 부모의 양육태도, 자기통제력, 스마트폰 중독 간 관계를 확인하고, 부모의 양육태도와 스마트폰 중독 관계에서 자기통제력의 매개효과를 검증하는 것을 목적으로 하였다. 이를 위하여 고등학생 283명에게 부모의 양육태도, 스마트폰 중독, 자기통제력에 대한 설문을 실시하였다. 부모의 양육태도 가운데 감독, 애정, 합리적 설명 유형은 긍정적인 양육태도로, 반면 비일관성, 과잉기대, 과잉간섭 유형은 부정적인 양육태도로 구분하였다. 연구결과, 첫째 부모의 양육태도, 스마트폰 중독, 자기통제력 간에는 유의미한 상관관계가 있는 것으로 나타났다. 먼저 긍정적인 부모의 양육태도는 스마트폰 중독과 부적 관계를, 자기통제력과 정적 관계를 보였다. 이와 반대로 부정적인 부모의 양육태도는 스마트폰 중독과 정적 관계를, 자기통제력과 부적 관계를 나타냈다. 둘째, 자기통제력이 부모의 양육태도와 스마트폰 중독 관계를 완전 매개하는 것으로 나타났다. 즉, 부모의 양육태도가 자녀의 스마트폰 중독에 직접 영향을 주기 보다는 부모의 양육태도가 자녀의 자기통제력에 영향을 미치고 다시 자기통제력이 스마트폰 중독에 영향을 준다는 것이다. 이러한 결과는 청소년의 스마트폰 중독을 예방하기 위해서는 부모교육을 통한 개입 보다는 청소년의 자기통제력을 높일 수 있는 기회를 제공하는 것이 효과적일 수 있음을 시사한다. 이를 바탕으로 교육적 개입 방안과 후속 연구를 위한 방향을 제시하였다.

Effects of Attitude Parameterization Methods on Attitude Controller Performance

허성욱,이성한,김창주 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.1

This paper intends to compare the effect of the attitude parameterization method on the performance of the attitude controller designed with the direct feedback of corresponding attitude states. To achieve this, the proportional-derivative controllers using the finite rotation angles and the modified Rodrigues parameters are designed with the same structure and equivalent performance of the direct quaternion-feedback control. It has been demonstrated through a series of comparative analyses that three different parameterization methods can be commonly used in designing their direct feedbacks for the spacecraft’s attitude control. Next, the effects of the nonlinear transform relations among three parameterizations are thoroughly investigated through the controller-response analyses for an eigen-axis rest-to-rest maneuver with varying the initial angular position. The controller designed with the finite rotation angles shows a consistent performance regardless of the initial angular position. Whereas, those using other two methods show large variations in their response characteristics. From the results, it can be concluded that the direct feedback controller designed with the finite rotation angles outperforms those using the modified Rodrigues parameters or the quaternion, especially when the spacecraft experiences an aggressive maneuver or has a wide operating range of the attitude.

Quaternion-based Finite-time Control for Attitude Tracking of the Spacecraft without Unwinding

Yong Guo,Shen-Min Song,Xue-Hui Li 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6

This paper investigates two finite-time controllers for the attitude tracking control of the spacecraft based on the quaternion by terminal sliding mode control. Because quaternion is unable to represent the set of attitudes both globally and uniquely, it can result in unwinding. Unwinding makes a spacecraft perform an unnecessary large-angle maneuver when a small-angle maneuver in the opposite rotational direction is sufficient to achieve the objective. The first controller converges to the equilibrium without singularity in finite time, while the second one converges to the region near the equilibrium without singularity, chattering and unwinding in finite time. Saturation function is introduced to the first controller to eliminate singularity, while a novel fast terminal sliding mode control is introduced to the second controller to eliminate singularity and unwinding. Theoretical analysis shows that the controllers can make the spacecraft follow a time-varying reference attitude signal in finite time and guarantee the stability of the overall closed-loop system. Numerical simulations also demonstrate the effectiveness of the proposed control schemes.

비행 자세제어를 위한 퍼지제어기 설계

추연규,김현덕,박종오 진주산업대학교 산업과학기술연구소 2003 산업과학기술연구소보 Vol.- No.10

The forces and moments at the aircraft c.g. have components due to aerodynamic sffects and to engine thrust. For the flight stability and autopilot systems we present a attitude control method using an intelligent control algorithm Which is based on the control rules from experts knowledge concerning the motion equations and other experiences. Then a robust fuzzy cintroller is developed to control the flight attitude. The controller can deal with multiple inputs and outputs. We have made an aircraft model and the orientation sensor for experimental fights. The control rules based on the flight expert's experience and knowledge can be programmed by fuzzy rules, and determined control rules by experimental flight. We can be stable attiude control by fuzzy controller.

Attitude Control of a Tethered Spacecraft

Sang-Bum Cho,N. Harris McClamroch 한국항공우주학회 2007 International Journal of Aeronautical and Space Sc Vol.8 No.2

An attitude control problem for a tethered spacecraft is studied. The tethered spacecraft is viewed as a multi-body spacecraft consisting of a base body, a massless tether that connects the base body and an end mass, and tether actuator dynamics. Moments about the pitch and roll axes of the base spacecraft arise by control of the point of attachment of the tether to the base spacecraft. The control objective is to stabilize the attitude of the base spacecraft while keeping the perturbations of the tether small. Analysis shows that linear equations of motion for the tethered spacecraft are not completely controllable. We study two different control design approaches: (1) we decouple the attitude dynamics from the tether dynamics and we design a linear feedback to achieve stabilization of the attitude dynamics, and (2) we decouple the controllable modes from the uncontrollable mode using Kalman decomposition and we design a linear feedback to achieve stabilization of the controllable modes. Simulation results show that, although it is difficult to control the tether, the tether motion can be maintained within an acceptable range while stabilizing the attitude dynamics of the base spacecraft.