• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1787-1790
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• 2005

We have developed satellite devices for fine attitude control of the Science & Technology Satellite-2 (STSAT-2) scheduled to be launched in 2007. The analog sun sensors which have been continuously developed since the 1990s are not adequate for satellites which require fine attitude control system. From the mission requirements of STSAT-2, a compact, fast and fine digital sensor was proposed. The test of the fine attitude determination for the pitch and roll axis, though the main mission of STSAT-2, will be performed by the newly developed FDSS. The FDSS use a CMOS image sensor and has an accuracy of less than 0.01degrees, an update rate of 20Hz and a weight of less than 800g. A pinhole-type aperture is substituted for the optical lens to minimize the weight while maintaining sensor accuracy by a rigorous centroid algorithm. The target process speed is obtained by utilizing the Field Programmable Gate Array (FPGA) in acquiring images from the CMOS sensor, and storing and processing the data. This paper also describes the analysis of the optical performance for the proper aperture selection and the most effective centroid algorithm.

• 한국군사과학기술학회지
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• 제19권4호
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• pp.435-442
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• 2016

For inertial navigation systems, initial information such as position, velocity and attitude is required for navigation. Self-alignment is the process to determine initial attitude on stationary condition using inertial measurements such as accelerations and angular rates. The accuracy of self-alignment is determined by inertial sensor error. As soon as an inertial navigation system is powered on, the temperature of accelerometer rises rapidly until temperature stabilization. It causes acceleration error which is called temperature stabilizing error of accelerometer. Therefore, temperature stabilizing error degrades the alignment accuracy and also increases alignment time. This paper suggests a method to calculate azimuthal attitude using curve fitting of horizontal control angular rate in fixed-gain self-alignment. It is verified by simulation and experiment that the accuracy is improved and the alignment time is reduced using the proposed method under existence of the temperature stabilizing error.

• 과학기술학연구
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• 제13권2호
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• pp.37-70
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• 2013

기독교는 배아파괴로 인한 생명윤리문제를 들어 배아줄기세포연구에 반대하는 입장을 여러 차례 밝히고 신자들을 계도하고자 노력했으나 별다른 효과를 거두지 못했다. 이는 신자들의 태도결정에 교단의 입장 외에 다른 요인이 개입하고 있다는 것을 의미한다. 본 연구에서는 다양한 조사자료에 근거해 기독교 신자들이 배아 줄기세포에 대해 보이는 태도를 정리하고, 신자들의 태도형성에 영향을 미치는 요인을 동정하고자한다. 나아가 해당 요인들이 상호작용하는 과정, 신자들이 관련 정보를 해석하고 수용하는 과정에 보이는 특성 등을 정리하여, 배아연구에 대한 신자들의 태도결정에 종교적 요소가 미친 영향력이 제한적일 수밖에 없는 이유를 설명하고자한다.

• 제어로봇시스템학회논문지
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• 제14권3호
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• pp.307-317
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• 2008

Relaxed static stability(RSS) concept has been applied to improve aerodynamic performance of modem version supersonic jet fighter aircraft. Therefore, flight control system are necessary to stabilize an unstable aircraft and provides adequate handling qualities. Also, flight control systems of modem version aircraft employ a safety system to support emergency situations such as a pilot unknown attitude flight conditions of an aircraft in night flight-testing. This situation is dangerous because the aircraft can lose if the pilot not take recognizance of situation. Therefore, automatic recovery system is necessary. The system called the "Pilot Activated Recovery System" or PARS, provided a pilot initiated automatic maneuver capable of an aircraft recoveries in situations of unusual attitudes. This paper addresses the concept of PARS and designed using nonlinear control law design process based on model of supersonic jet trainer. And, this control law is verified by nonlinear analysis and real-time pilot evaluation using in-house software. The result of evaluation reveals that the PARS support recovery of an aircraft unusual attitude and improve a safety of an aircraft.

• 한국정보시스템학회지:정보시스템연구
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• 제30권2호
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• pp.79-103
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• 2021

Purpose Based on consumers' economic, psychological, self-development and conversion costs, this study discusses the relationship between consumers' negative attitude to their shadow work during the course of using self-service in unmanned supermarkets and their behavior. Design/methodology/approach Along with the Hirschman(1970)'s EVLN(Exit, Voice, Loyalty, and Neglect) reviewed, the proposed model of this study is based on the S-O-R model(Mehrabian and Russel, 1974) and mental accounting theory(Thaler, 1999), having empirical validation. Findings In the process of visits and consumption in unmanned supermarkets, increasing economic and psychological benefits can effectively reduce consumers' negative attitudes towards shadow work. In addition, the increase in switching costs will also effectively reduce consumers' negative attitudes towards shadow work. When shadow work holds a negative attitude, all the three kinds of actions will occur. Unmanned supermarket operators use consumers to create value while giving a certain return to them, which is conducive to the sustainable development of unmanned supermarket enterprises.

• 산업융합연구
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• 제20권10호
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• pp.113-120
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• 2022

본 연구의 목적은 다문화청소년의 이중문화수용태도가 우울에 미치는 영향과 그 관계에서 사회적 위축의 매개효과를 검증하는 데 있다. 이를 위해 다문화패널(MAPS) 8차년도(2018) 자료를 사용하였으며 1,158명을 대상자로 선정하여 Process Macro Model과 Bootstrapping 등의 분석방법을 통해 검증하였다. 분석결과, 첫째, 다문화청소년의 긍정적인 이중문화수용태도는 사회적 위축과 우울감을 낮추는 것으로 나타났다. 둘째, 사회적 위축은 우울감을 증가시키는데 영향을 미치는 것으로 나타났다. 셋째, 이중문화수용태도와 우울과의 관계에서 사회적 위축은 부분매개 역할을 하는 것으로 확인되었다. 이상의 연구결과를 토대로 다문화청소년의 우울을 낮추고 사회적 위축을 감소시키기 위한 다양한 프로그램의 개발과 실천적 방안을 제시하였다.

• 유통과학연구
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• 제11권9호
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• pp.17-24
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• 2013

Purpose - The objective of the paper is to describe the relationship between consumer perceptions and attitudes of complaints against the behavior of their complaint. Research design, data, methodology - The study explore the process of complain intention which mediated by perceptual process and attitudinal behavior. Structural equation modeling used in this study is aim to describe the relationship simultaneously. The two samples failure (high vs. low level services) will be compared using analysis of variance. Results - The study found that the higher the alienation, the lower the perceived value of consumer complaint and the higher likelihood of successful perceived consumer complaint. The study also found the more positive the prior complaint experience, the more positive attitude toward complaining, the higher the perceived value of complaint and the higher the likelihood of successful perceived complaint. Furthermore, the perceived value of customer's complaint affect positive intention and perceived consumer likelihood of successful complaint increases intention complaint. Conclusions - The findings of this study show that the effect of a number of personal antecedents such as alienation; prior complaint experience and controllability will vary toward the complaint intention. Furthermore, the attitudinal and perceptual factors play a partial mediation role for that relationship.

• 아동학회지
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• 제35권6호
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• pp.47-64
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• 2014

This study was conducted with the aim of examining the acculturation process of children and parents from multicultural families, which can affect the self-esteem of the children concerned. The participants from each family consisted of the fathers, mothers, and school-age children of 179 households. The results of this study reveal the following: (1) First, the multicultural children scored higher than the average in self-esteem in most areas except school life. Furthermore, the children and parents had a comparatively positive attitude toward acculturation (2) Second, the children's level of self-esteem had significant correlations only with the acculturation of mothers as opposed to fathers. (3) Third, the impacts of acculturation of the children and their parents on the children's self-esteem followed different patterns according to the sub-areas of self-esteem. Specifically, the self-esteem for overall self-value and family relations rose when the multicultural acceptance attitude of mothers was high. However, area of peer relations was affected only by the acculturation of children. The area concerning school life was high when the mother-culture propagation attitude of mothers was low.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.1257-1266
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• 2021

The study examines factors that influence shopping intention of online consumers in Vietnam. Studied factors include consumers' attitude, subjective norms, perception of behavioral control, perception of usefulness, perceived risks and trust. The expansion of Theory of Planned Behavior (TPB) and Technology Acceptance Model (TAM) are used as basic theories. We have surveyed people who have experiences on online shopping. There are 836 selected questionnaires that are qualified for data processing. The collected data are analyzed through a process which starts from scale reliability test to exploratory factor analysis (EFA), correlation analysis and regression analysis. The results show that shopping intention of online consumers are positively affected by their attitude, subjective norms, perception of behavioral control, perception of usefulness and trust. In contrast, online shopping intention is negatively affected by the perceived risks that online shopping could bring. Among those factors, the perception of risk is shown to have the strongest influence to online shopping intention. The findings of this study suggest that managers and retailers can apply cash-on-delivery method and design their website with user-friendly interface to enhance online shopping intention of consumers. The Government is also recommended to fulfill the law system to reduce customers' perception of financial risks.

• 복식
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• 제52권3호
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• pp.99-109
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• 2002

The purpose of 7his study was to understand the characteristic of involvement which affect to consumers of fashion market, and at the viewpoint of complex style, this involvement is consists of clothing involvement, advertising involvement and situation involvement, also by verifying the consumers reaction to clothing advertising effect process. It analyzed at last six hundred eighteen women in the age of twenty to thirty yearn old who live in Seoul. SPSS package were used to analyze the gathered data. Frequency, percentage, fator analysis. ANOVA. duncan test, correlation analysis. The results of this study can be summarized as follows : First, The clothing involvement was the highest Involvement of fashion consumers and it showed high correlation among clothing involvement, advertising involvement, situation involvement. Second, Depends on the nature of involvement, involvement group is divided as the most involvement, high involvement, low Involvement and the most lowest involvement groups. Third, Involvement and advertising effect showed highly difference, and the higher involvement group has high perceptive process and memory progress, friendly attitude process, and purchasing intention is high.