• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2003.09a
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• pp.616-619
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• 2003

In this paper, we develop an input device equipped with accelerometers and gyroscopes. The installed sensors measure the inertial measurements i.e., accelerations and angular rates produced by the movement of the system when a user is writing on the plane surface or in the three dimensional space. The gyroscope measurement are integrated once to give the attitude of the system and consequently used to remove the gravity included in the acceleration measurements. The compensated accelerations bin doubly integrated to yield the position of the system. Due to the integration processes involved in recovering the users'motions, the accuracy of the position estimation significantly deteriorates with time. Among various error sources of the system incorrect estimation of attitude causes the largest portion of the positioning error since the gravity is not fully cancelled. In order to solve this problem, we propose a Kalman filler-based attitude estimation algorithm which fuses measurement data from accelerometers and gyroscopes by fuzzy logic approach. In addition, the online calibration of the gyroscope biases are performed in parallel with the attitude estimation to give more accurate attitude estimation. The effectiveness and the feasibility of the presented system is demonstrated through computer simulations and actual experiments.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.26 no.2
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• pp.76-82
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• 2018

A test simulator is needed to develop a fuel quantity measurement system that takes into account the roll and pitch motion of the aircraft. In this paper, we develop a test simulator that consists of attitude simulation equipment, fueling equipment, and data storage equipment. The attitude simulation equipment simulates the aircraft attitude. It is manufactured to operate pitch angle and roll angle movement. The fueling equipment supplies fuel to the supplementary fuel tank. The data storage equipment collects and stores the measured data. We also develop an automation software that operates the test simulator and collects data automatically. The test simulator has been automated to prevent testers from being exposed to toxic fuel. Through automation software, the collection period is reduced by one quarter compared to manual collection. The developed fuel quantity measurement system is verified through the test simulator.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.235-245
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• 2008

The interactive advertisement is already on satellite and cable broadcasting hereafter the introduction of this system is concerned on terrestrial programs. This study is to research the effectiveness of interactive TV advertising focusing on factors of involvement and interaction. Study started for the effect measurement of interactive television advertisement. Interactive television advertisement has different concept than existing television advertisement. Thus, the effect also needs to examine in other methods. Study is mainly focusing on the characteristics of interactive and the experiments, which was based on existing data, for measurement of effect. In the experiments, the characteristics were categorized in a search time, a number of searched pages about interactive television advertisement. The research finds that the involvement of the audience increases when the interaction of advertising attitude, brand attitude, and purchase intentions also increases. And so, a successful interactive TV advertisement results in longer searching hours and greater it visits by the audience when the interaction factors are considered and increased. By study of consumer's characteristics and behavior, a new method of the effect measurement for interactive television advertisement is provided. The new method includes not only existing measurement elements of television advertisement which are attitude on advertising and brand, and customers' purpose, but also the features of interactive television advertisement, which are search time, a number of searched pages. Recently added features provides data of the effect on high/low groups and it contributes to the process of interactive television advertisement. Study on interactive television advertisement will be helpful to plan an effective strategy by suggesting the theoretical evidence of its effect.

• Journal of Advanced Navigation Technology
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• v.8 no.2
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• pp.112-119
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• 2004

This paper proposes an attitude determination GPS/INS integrated system scheme for a UAV and presents experimental flight test results. The proposed system is designed as a part of an autopilot system and comprises a GPS attitude determination receiver, an off-the-shelf inertial measurement unit (IMU), and a navigation computer unit (NCU). UAV requires accurate attitude information for stable automatic flight control. The proposed system can provide accurate attitude information for the flight control computer (FCC) so that stable automatic flight control can be achieved. In order to verify the performance of the proposed scheme, an integrated navigation system has been developed. In order to evaluate the developed navigation system, the flight test has been performed. In the flight test, the developed system was shown to provide the position, the velocity and the attitude satisfactorily enough for stable flight control. The accuracy of the attitude information of the developed system was confirmed by comparing attitude of vertical gyro.

• 제어로봇시스템학회:학술대회논문집
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• 1995.10a
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• pp.110-114
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• 1995

This paper presents the on-board attitude determination algorithm for LEO (Low Earth Orbit) three-axis stabilized spacecraft. Two advanced star trackers and a three-axis Inertial Reference Unit (IRU) are assumed to be attitude sensors. The gyro in the IRU provides a direct measurement of the attitude rates. However, the attitude estimation error increases with time due to the gyro drift and noise. An update filter with measurements of star trackers and/or sun sensor is designed to update these gyro drift bias and to compensate the attitude error. Kalman Filter is adapted for the on-board update filter algorithm. Simulation results will be presented to investigate the attitude pointing performance.

• Journal of Families and Better Life
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• v.28 no.4
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• pp.67-76
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• 2010

This study investigates working parent stress. This study surveyed 240 working mothers who are raising toddlers and 106 teachers in Seoul, Cyeong-gi, and Incheon. For this study, the Parenting Stress scale developed by Kim & Kang (1997) was used as the instruments for measurement and parental stress. To measure maternal separation anxiety, this study used the Maternal Separation Anxiety Scale (MSAS) developed by Hock (1989), while the Attitude for Occupation scale developed by Farel (1980) was used to measure the attitude for occupation. In addition, the Preschool Adjustment Questionnaire (PAQ) developed by Jewsuwan, Luster and Kostelink (1992), and modified by Oh Chong Eun (2001) were used as the instruments for measurement and adjustment. Data analysis was done using the SPSS WIN 15.0 version and the collected data were subject to a descriptive statistical analysis, one-way ANOVA t-test, and multiple regression analysis. The influential independent variables affecting parenting stress listed in order of significance were maternal attitude for occupation, adjustment of children, maternal anxiety, and income.

• International Journal of Aeronautical and Space Sciences
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• v.17 no.2
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• pp.222-231
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• 2016

This paper proposes a new method achieving computationally efficient attitude reference system for low cost strapdown sensors and microprocessor platform. The main idea in this method is to define and compare velocity differential vectors, geometrically computed from INS and GPS data with different update rate, for generating attitude error measurements which is further used for filter construction. A quaternion based Kalman filter configuration is applied for the attitude estimation with the adapted measurement model of differential vector comparison. Linearized model for Extended Kalman Filter and low pass filtered characteristics of measurement greatly extend the affordability of the proposed algorithm to the field of simple low cost embedded systems. For performance verification, experiment are done employing a practical low cost MEMS IMU and GPS receiver specification. Performance comparison with a high grade navigation system demonstrated good estimation result.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.3
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• pp.65-70
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• 2005

Incorrect ambiguity integer of GPS make a large error on attitude determination. In this paper one method is suggested for estimating the multipath of GPS carrier measurement while attitude determination. The multi-antenna system consists of 4 antennas have the same clock error help to make attitude determination effectively. If the distance between antennas is a half wavelength, it is not necessary to search the ambiguity integer and the multipath of GPS carrier measurement can be estimated. The results of the simulation are shown and analyzed.

• Journal of Families and Better Life
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• v.3 no.1
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• pp.23-34
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• 1985

The purpose of this study is to investigate the relations between housewife's self esteem and attitude toward household work its satisfaction and to find out how independent variables(housewife's age, education level, employment, household work helper, type of family) have effect on the two dependent variables. The measurement of self-esteem was based on the self-concept test standarized by Jung Won Sick, reformed the Fitts measurement for Korean Society. In order to measure of attitude toward household work and its satisfaction, based on the previous research, researcher made the measurement . the research was conducted on 234 housewives in Seoul in September 1984. Data was analyzed by percentage, mean, frequence analysis of variances, Pearson's correlation coefficient. The result can be summarized as following. 1)Over on half of housewives have high self-esteem comparatively. 2) Age and education level were variables to have influence n the attitude toward household work. 3)The attitude toward household work and its satisfaction comparatively were high. 4)Education level and type of family were variables to have influence on the attitude toward household work. Education level, employment and household work helper were variables to have influence on the satisfaction of house hold work. 5) Level of Self-esteem has influence on the attitude toward household work and its satisfaction. The higher level of self-esteem was, the higher becomes the score of the attitude toward house hold work and its satisfaction. Following suggestions can be extracted form the results of above study. 1) research of housewife's self-esteem didn't established a setted theory yet. I think, therefore, it requires deeper study about housewife's household work look upon as her occupation and relation between the household work as her occupation and her self-esteem in this area. 2) Population and sociological variables, used in this study, hardly influenced on self-esteem, the attitude toward household work and its satisfaction. Also the result didn't correspond with one another. So I think it requires need of further study how psychological and family function variables will have influence on housewife's self-esteem, the attitude toward household work and its satisfaction. 3) To recognized the value of household work objectively, many researchers tried to investigate of economical value of household work, But if housewife can realize her self-actualization through household work, it requires the study that try to objectively not only estimate the economic value of household work, but also the contribution of the aspect of family psychology.

• Current Research on Agriculture and Life Sciences
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• v.32 no.3
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• pp.159-163
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• 2014

Agricultural unmanned helicopters have become a new paradigm for aerial application. Yet, such agricultural helicopters require easy and affordable attitude control systems. Therefore, this study presents an affordable attitude measurement system using a DCM (direction cosine matrix) algorithm that would be applied to agricultural unmanned helicopters. An IMU using a low-cost MEMS and an algorithm to estimate the attitude of the helicopter were applied in a gimbals structure to evaluate the accuracy of the attitude measurements. The estimation errors in the attitude were determined in comparison with the true angles determined by absolute position encoders. The DCM algorithm and sensors showed an accuracy of about 1.1% for the roll and pitch angle estimation. However, the accuracy of the yaw angle estimation at 3.7% was relatively larger. Such errors may be due to the magnetic field of the stepping motor and encoder system. Notwithstanding, since the intrinsic behavior of the agricultural helicopter remains steady, the determination of attitude would be reliable and practical.