• International Journal of Aeronautical and Space Sciences
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• v.1 no.1
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• pp.70-80
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• 2000

The attitude knowledge error model is formulated for specifically KOMPSAT attitude determination system using the Lefferts/Markley/Shuster method, and the attitude determination(AD) error analysis is performed so as to investgate the on-board attitude determination capability of KOrea Multi-Purpose SATellite(KOMPSAT) using the covariance analysis method. Analysis results show there is almost no initial value effect on Attitude Determination (AD) error and the sensor noise effects on AD error are drastically decreased as is predicted because of the inherent characteristic of Kalman filter structure. However, it shows that the earth radiance effect of IR-sensor(earth sensor) and the bias effects of both IR-sensor and fine sun sensor are the dominant factors degrading AD error and gyro rate bias estimate error in AD system. Analysis results show that the attitude determination errors of roll, pitch and yaw axes are 0.056, 0.092 and 0.093 degrees, respectively. These numbers are smaller than the required values for the normal mission of KOMPSAT. Also, the selected on-orbit data of KOMPSAT is presented to demonstrate the designed AD system.

• Journal of Korean society of Dental Hygiene
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• v.13 no.3
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• pp.439-448
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• 2013

Objectives : The objective of this study is to investigate the work value factors and the professional attitude factors of dental hygienists and provide basic data for dental hygiene curricula. Methods : A total of 329 dental hygiene students in 4 universities completed the questionnaire which consisted of 15 questions for the work value factors and 10 questions for the professional attitude factors. Correlation between the work value factors and the professional attitude factors was analyzed. Results : The "students with no clinical practice experience (4.34 points)" were seen to be statistically significant (p= .013) in the work value factors, as compared to the "students with clinical practice experience (4.19 points)". In accordance with the grade level (p= .000), conformity in aptitude (p= .022), satisfaction level for the major (p= .000), desired duration of career (p= .009), and presence of recommendation for dental hygiene department (p= .000), the professional attitude factors had statistically significant differences. The higher the scores of the work value factors of dental hygiene students, the higher the scores of the professional attitude factors appeared, there by showing a positive (+) correlation (r= .367). Conclusions : For the cultivation of work value factors and professional attitude factors for dental hygiene students, it is necessary to improve the educational system that reflects the operation of a counseling and mentoring by the utilization of structured personality type testing tools and an improvement of interpersonal relationships.

• Journal of Preventive Medicine and Public Health
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• v.7 no.1
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• pp.203-209
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• 1974

This study is intended to comparison of the recent ideal number of children and atrial approach for analyzing value system for children that form attitude affecting birth control with earlier study conducted 10 years ago. In general the traditional fertility pattern of Korea may be considered as 'early marriage and high fertility' backed by the confucian value system of a farming-oriented country. A selective attitude favoring sons contributes substantially to fertility. But Korea is now moving toward a late marriage and fertility pattern. This has been due to the repid introduction of western culture and a partial acceptance of western value systems, a relative weakening of traditional value systems, a gradual increase in infant and child servival rates thresh medicines, and a desire to avoid having too many children because of economic poverty. This study showed following results: Ideal number of sons and daughters in urban area was decreased by 0.2 respectively compared to earlier study. In rural area, the number of decrease of sons and daughters was 0.5 and 0.2 respectively. The conception concerning Happiness has changed to wealth from health in previous opinion. Regarding attitude toward having sons, 98 percent of them wanted to have sons positively, moreover 10 percent of them wanted two or more sons. Regarding reasons for the wanting sons, we see that economic and traditional considerations, such as dependance in old age, and inheritance of the family line, are a principle concern of about 56 percent in both areas. The rate of dependence in old age was decreased conspicuously compare to previous study while the rate of helding rituals was increased remarkably in rural area. Among reasons for limiting family size. 'for better living and for better education for their children were main rasons reted 46 percent in urban, 51 percent in rural areas. The rates were not changed compare to previous study. Regarding attitude of those who have no son or children, the rate of re-marriage with second wife was decreased remarkably in rural area and the rate of living without special behaivor for having son was increased compare to previous study.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.799-804
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• 1993

In this paper, the scheme of combining the orbit correction and attitude control of a 3-axis stabilized satellite is suggested. Being coupled and complimentary, it is preferable to achieve the required orbit correction and the desired attitude control simultaneously. A solution of the probes simultaneous control of orbit correction and attitude of a satellite, is obtained by solving the two point boundary value problem numerically. The first-order gradient algorithm is used to solve the numerical problem. The simulation results show that the East-West station keeping process with the combined system of an orbit correction and an attitude control is satisfactory.

• Journal of Korea Multimedia Society
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• v.24 no.9
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• pp.1299-1310
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• 2021

Under the background of the rapid development of digital educational games, we have to evidently research the elements of the achievement system of children's DEG (Digital Educational Game), and analyze the relations between the elements and make a profound study on the achievement system and its components on the impact of player's attitude. Compared with the existing research, the research contents and methods are innovative and reliable. The results show that players have a positive attitude towards the DEG achievement system, DEG achievement system has important value and role for educational games. Which is made of five elements: symbol, reward, logic, social interaction, and knowledge. The five elements interact with each other and have a positive impact on players' attitudes. DEG achievement system with five elements will bring players a positive experience. These findings provide a detailed study of the components of the achievement system. With all of these, we can explain the role and relationship of the components, and provide new ideas and empirical evidence for the design and development of children's educational game achievement system. The above findings provide a detailed description of the components of the DEG achievement system, explain the role and value of each component, and the relationships and patterns among the components, it provides a new perspective and empirical evidence for the design and development of the children's system DEG results.

• Journal of Mechanical Science and Technology
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• v.18 no.1
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• pp.122-131
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• 2004

A constraint equation-based control law design for large angle attitude maneuvers of flexible spacecraft is addressed in this paper The tip displacement of the flexible spacecraft model is prescribed in the form of a constraint equation. The controller design is attempted in the way that the constraint equation is satisfied throughout the maneuver. The constraint equation leads to a two-point boundary value problem which needs backward and forward solution techniques to satisfy terminal constraints. An observer-based tracking control law takes the constraint equation as the input to the dynamic observer. The observer state is used in conjunction with the state feedback control law to have the actual system follow the observer dynamics. The observer-based tracking control law eventually turns into a stabilized system with inherent nature of robustness and disturbance rejection in LQR type control laws.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2329-2331
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• 2001

In this paper, were developed the 3 axes attitude control sensor system to control and monitoring the moving object. The proposed sensor system has been studied in Japan, America for a year ago. But it is high expensive and has a difficulty in application. To overcome these problems, proposed the 3 axes attitude control sensor system is low cost and easily applied. Proposed sensor system is equipped with the 3 gyro sensors, 2 tilt sensors and 3 MR sensors using 80C51 microprocessor for signal processing. It's output value transmit at long distance using RS232 serial communication protocol. We expect this system shall have a good performances in many applications of control and monitoring the moving object.

• Journal of Digital Convergence
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• v.16 no.1
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• pp.399-408
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• 2018

The purpose of this study is to investigate the effects of father's family-of-origin experiences on parenting attitude and parenting participation around mediating effects of value of children. To this end, this study investigated family-of-origin experience, value of children, parenting attitude, and degree of parenting participation on 247 fathers of 3~5 year old children. Descriptive statistics, correlation analysis, regression analysis, and Sobel Test were conducted using SPSS 21 program on the collected data. According to the research result, there was a significantly positive relationship between emotional value of children, parenting attitude, and parenting participation among family-of-origin experience and value of children. This study conducted a regression analysis and Sobel Test by stage to identify mediating effects. As a result, it was identified that father's family-of-origin experience makes positive effect on parenting attitude and parenting participation, and emotional value of children among value of children mediates their relationship. Based on the findings, this study suggested that multilateral consideration and systematic system for formation of positive value of children are needed and suggested the direction of follow-up study on fathers as a coparent.

• The Journal of Information Systems
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• v.32 no.3
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• pp.85-116
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• 2023

Purpose The importance of data as a key resource of the intelligence revolution is being highlighted, among all those phenomena MyData is attracting attention as a key concept by organizations and individuals that eventually leads the data economy. In this regard, this study was started to contribute to the successful settlement and continuous growth of the domestic MyData industry, which has just entered the system. Design/methodology/approach To develop and test all proposed casual relationships within the research model, we used the Value-Attitude-Behavior(VAB) model as a basic framework. A total of 385 copies were used for the final analysis, and for SPSS 25.0, MS-Excel 2016, and AMOS 24.0 to summarize respondent demographic characteristics, measurement model, and structural model. Findings Findings show that all proposed hypotheses were supported with the exception of the moderating effect of organizational information transparency between data controllability and perceived value, and between data controllability and attitude toward MyData service.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.6
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• pp.463-472
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• 2017

Inertial Navigation System Alignment is the process to determine direction cosine matrix which is the transformation matrix between the INS body frame and navigation frame. INS initial position value is necessary to INS attitude calculation, so that user should wait until he get such value to start the INS alignment. To remove the waiting time, we propose an alignment algorithm that immediately starts after the INS power on by using pseudo initial position input and then is completed with attitude error compensation by entering true position later. We analyse effect of INS sensor error on attitude in process of time and verify the performance and usefulness of the close-loop alignment algorithm which corrects attitude error from the change of initial position.