• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.56.1-56
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• 2001

Initial attitude error is one of the large error sources in the navigation errors of SDINS. And it is important to decide the initial attitude of SDINS. The method, like a self-alignment or a transfer alignment method, is required to a precise INS. If we do not have a precise INS, we should get large attitude error. After performing the initial alignment, a vehicle has the initial attitude error. Therefore, it results in navigation error due to the initial attitude error. But, if we use position information during flight, we could estimate and compensate a vehicle attitude error. So, we can maintain a precise attitude in spite of existing the initial attitude error. Using the uplinked position information from a land-based radar system, the new algorithm estimates the attitude of the SDINS during flight ...

• International Journal of Aeronautical and Space Sciences
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• 제11권4호
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• pp.303-312
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• 2010

This paper introduces the upper stage attitude control system of KSLV-I, which is the first space launch vehicle in Korea. The KSLV-I upper stage attitude control system consists of two electro-hydraulic actuators and a reaction control system using cold nitrogen gas. A proportional, derivative, and integral controller is designed for the electro-hydraulic thrust vectoring system, and Schmidt trigger ON/OFF controllers are designed for the reaction control system. Each attitude controller is designed to have enough stability margins. The stability and performance of KSLV-I upper stage attitude control system is verified via hardware in the loop tests. Hardware in the loop tests are accomplished for perturbed flight conditions as well as nominal flight condition. The test results show that the attitude control loop of KSLV-I upper stage is very stable and the attitude controllers perform well for all flight conditions. Attitude controllers designed in this paper have been successfully applied to the first flight of KSLV-I on August 25, 2009. The flight test results show that all attitude controllers of the KSLV-I upper stage performed well and satisfied the accuracy specifications even during abnormal flight conditions.

• 대한가정학회지
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• 제36권7호
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• pp.111-122
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• 1998

The purpose of this study was to investigate the relationship between parental attitude and social-emotional development of kindergarten children. The sample were 119 children and their parents(mothers and fathers) of a kindergarten in Seoul. The instruments for this study were the modified PM(Parental Modemity) by Schaefer and Edgerton and the modified social-emotional development scale by Korea Behavioral Science Institute. The data analyzed y frequency, mean, t-test, and Pearson's r. Major findings were that the mothers' parental attitude was related to the children's curiosity. Also, there were significant differences between the mothers' parental attitude and fathers' parental attitude according to their children's sex.

• 한국항공운항학회지
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• 제26권3호
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• pp.48-54
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• 2018

This paper deals with a development of a quad-rotor for a hovering attitude control. First, a rotational dynamics are derived to design an attitude controller. The attitude controller is based on PI (Proportional-Integral) controller. For a stable attitude control, an anti-windup method applies to the PI attitude controller. Additionally, a complementary filter is used to obtain more reliable attitude. Gain values of the attitude controllers based on the anti-windup method are obtained through tests. Finally, the quad-rotor with the anti-windup based PI attitude controller is developed and a hovering attitude control flight tests are performed. As a result, the developed quad-rotor is capable of stable hovering.

• 한국콘텐츠학회논문지
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• 제8권6호
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• pp.242-252
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• 2008

본 연구는 관광개발에 대한 지역주민의 태도와 참여의사에 미치는 영향요인을 파악하기 위해, 충남 논산시 지역주민을 대상으로 관광개발에 대한 태도, 관광개발의 참여의식, 개인의 자기검색성향에 대하여 연구를 실시하였다. 그 결과, 지역주민의 자기검색성향과 관광개발에 대한 태도와의 영향관계에 있어서 자기검색성향이 관광개발의 경제적 태도와 관광개발의 사회적 태도에 영향을 미치는 것으로 조사되었다. 자기검색성향과 관련하여 관광개발에 대한 참여의식에 대한 영향관계를 확인하고자 로지스틱회귀분석을 실시한 결과, 관광개발의 참여의식에 모든 요인들이 2배에 가까운 영향관계가 있는 것으로 조사되었다. 이것은 자기검색에서 타인지향성 성향을 갖춘 지역주민들이 증가되면 될수록 관광개발에 있어서 관광개발의 참여 활동에 적극적인 행동을 보여 질 것으로 기대된다.

• Asia pacific journal of information systems
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• 제4권2호
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• pp.247-263
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• 1994

This paper reports the results of a field study investigating the effect of user participation and attitude on the success of information system implementation during the system development process. The theoretical framework for this research is based on the organizational change theory, in which the attitude affects the effects of user's participation. User participation and attitude were defined as independent variables and the performance of system implementation as dependent variable. User participation was defined as a direct participation by end users in the process of the new information system development. This was measured by user's participation/non-participation. User attitude refers to user's opinions or feelings before a new system is developed. This was measured by user's favor toward a system. The performance of system implementation was measured by the surrogate variable, the degree of individual satisfaction on developed system. To achieve the objective of this research, a field research method utilizing questionnaires were employed. They were distributed to 221 users present during and/or after system development. Among 185 questionnaires returned, 175 questionnaires were used for analysis. The major findings can be summarized as follows: First, there was no significant effect of user participation on user satisfaction. Second, there was a significant effect of user attitude on user satisfaction. Third, there was no significant interaction effect of user participation and attitude on user satisfaction. It is worth to note that the user's participation did not have any significant effect on the user's satisfaction. It seems the reason for the above result is due to user's involuntary participation. In fact, the user does not have much leverage in the process of system development, which may result in poor performance of user participation. Since user attitude is an important factor in the success of system implementation, however, a method to overcome unfavorable attitude of user should proceed all others.

• International Journal of Advanced Culture Technology
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• 제12권1호
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• pp.85-93
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• 2024

In this paper, focusing on Oscar Wilde's novel "The Picture of Dorian Gray," we explore the protagonist's lack of conscience and unethical attitude, emphasizing its relevance to our self-development and growth. The primary goal is to interpret the impact of Dorian Gray's actions and choices on personal development and growth, highlighting the importance of a specific mindset and attitude to the reader. It dissects how Wilde navigates the intricate layers of Dorian's character, exposing the ethical dilemmas and transformative moments that contribute to the profound changes within him. The examination sheds light on the depth and complexity of Dorian Gray's character, offering readers a nuanced understanding of the forces at play in his moral and psychological journey. Interpretation of Wilde's intent to impart lessons on the reader's personal growth and development through Dorian's story is undertaken. The discussion also explores the impact of Dorian's unethical attitude on contemporary readers and its influence on our daily lives and values.

• 아동학회지
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• 제25권3호
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• pp.75-85
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• 2004

This study was to investigate parental rearing attitudes which are perceived by the only children and sibling children and their socio-emotional development. The subjects were 426 4th and 6th grade students in an elementary school located in Seoul and Kyonggi-do. The data was analyzed by SPSS WIN computer program. Two-way ANOVA and Multiple Regression analyses were performed. Within group variables that predicted children's socio-emotional development were parental achievemental, loving and autonomous attitude, and school-aged children's socio-emotional development was most predicted by parental achievemental attitude.

• 농촌지도와개발
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• 제30권1호
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• pp.31-41
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• 2023

This study aims to examine the structural relationships among rurality perception, tourism attitude, and behavioral intention in rural healing tourism. Particularly, this study focused on the mediation effect of attitude. Data were collected from 658 rural healing tourists by online survey. SPSS 28.0 and AMOS 28.0 were used for frequency, exploratory factor, confirmatory factor, and structural equation modeling analyses. The results of structural equation modeling indicate perception of rurality had a positive effect on attitude and behavioral intention. In addition, attitude mediated the relationships between perception of rurality and behavioral intention. The results of this study suggest the importance of understanding the interests and pursuits of rural healing tourists and providing them with the values they want. Since rurality has a direct influence on attracting healing tourists, it is necessary to establish a positive image of rural healing tourism.

• 제어로봇시스템학회논문지
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• 제20권4호
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• pp.468-473
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• 2014

This paper describes the in-flight alignment of SDINS (Strapdown Inertial Navigation Systems) using an EKF (Extended Kalman Filter) and a UKF (Unscented Kalam Filter), which allow large initial attitude error uncertainty. Regardless of the inertial sensors, there are nonlinear error dynamics of SDINS in cases of large initial attitude errors. A UKF that is one of the nonlinear filtering approaches for IFA (In-Flight Alignment) are used to estimate the attitude errors. Even though the EKF linearized model makes velocity errors when predicting incorrectly in case of large attitude errors, a UKF can represent correctly the velocity errors variations of attitude errors with nonlinear attitude error components. Simulation results and analyses show that a UKF works well to handle large initial attitude errors of SDINS and the alignment error attitude estimation performance are quite improved.