• 제어로봇시스템학회논문지
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• 제11권11호
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• pp.913-919
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• 2005

An advanced method of Relaxed Static Stability (RSS) is utilized for improving the aerodynamic performance of modem version supersonic jet fighter aircraft. The flight control system utilizes RSS criteria in both longitudinal and lateral-directional axes to achieve performance enhancements and improve stability. Standard CLDA (Control Law Design and Analysis) process is provided that reduce the development period of the flight control system. In addition, if this process is employed in developing flight control laws, it reduces the trial and error development and verification of control laws. This paper details the design process of developing a flight control law for the RSS aircraft, utilizing military specifications, linear and nonlinea, analysis using XMATH and ATLAS(Aircraft, Tim Linear and Simulation), handling quality tests using the HQS (Handling Quality Simulator), and real flight test results to verify aircraft dynamic flight responses.

• 제어로봇시스템학회논문지
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• 제14권8호
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• pp.824-836
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• 2008

Relaxed static stability(RSS) concept has been applied to improve aerodynamic performance of modern version supersonic jet fighter aircraft. Therefore, flight control systems are necessary to stabilize an unstable aircraft, and provides adequate handling qualities and achieve performance enhancements. Standard FCSDVP (Flight Control System Design and Verification Process) is provided to reduce development period of the flight control system. In addition, if this process is employed in developing flight control system, it reduces the trial and error for development and verification of flight control system. This paper addresses the flight control system design and verification process for the RSS aircraft utilizing design goal based on military specifications, linear and nonlinear system design and verification based on universal software, handling quality test based on HILS(Hardware In-the-Loop Simulator) environment, and ground and flight test results to verify aircraft dynamic flight responses.

• 한국정밀공학회지
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• 제11권1호
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• pp.108-113
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• 1994

Active noise control technique has superior performance in low frequency ranges(50 .approx. 400Hz) to the conventional passive noise control technique. For the feasibility of active noise control, it is required to develop a controller which can implement control algorithm on real-time. In this study, therefore, real-time controller is developed using TMS320c25, high speed digital processor. Unlike conventional DSP board of complete ADD ON type, it is possible for the developed controller to interface with the other computer system easily by series communication for the convenience of program development. Furthermore it is designes to be separated readily as a control device. Active noise control of duct system is implemented ti evaluate a performance of developed device. Active noise control of duct system is implemented to evaluate a performance of developed controller using filtered-x LMS algorithm.

• 제어로봇시스템학회논문지
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• 제8권9호
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• pp.747-756
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• 2002

The automatic steering system for unmanned vehicle was developed. The magnet and MR (Magnetoresistive) sensors are used for the tue detecting system. The lateral distance between sensor and the center line of the road is determined by the linearization of the distance according to the output. The PD control theory is used for the design of the controller to compare with $H_\infty$ control theory. The $H_\infty$ control theory is used for the design of the controller to reduce the disturbance. The performance of the PD controller and $H_\infty$ controller is compared in simulations and tests. The PD controller is easy to tune in the test site. The $H_\infty$ controller is robust far the disturbances in the test results.

• 한국지역사회생활과학회지
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• 제25권4호
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• pp.473-486
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• 2014

This study examines the relationships between dietary self-efficacy, social support, depression, and weight-control behavior of children and adolescents. A total of 593 students (280 children and 313 adolescents) from schools in Seoul, Gyeonggi-do, Jeollabuk-do, and Daegu were surveyed using scales for dietary self-efficacy, social support, depression, and weight-control behavior. The data were analyzed through a frequency analysis, means and standard deviations, a t-test, a one-way ANOVA, the Tukey test, the Pearson's correlation, and a stepwise multiple regression analysis. According to the results, weight-control behavior was more likely in girls than boys, high-school students than elementary-school students, and obese/overweight students than normal/underweight students. The factors influencing children's weight-control behavior were general eating habits, the BMI, depression, food choice, and family support, in that order, and those influencing adolescents' weight-control behavior were general eating habits, gender, and the BMI, in that order. These results are expected to be useful as basic data for developing weight-control programs for children and adolescents.

• 한국어병학회지
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• 제27권1호
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• pp.67-75
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• 2014

Aquaculture drugs have used to prevent disease in aquaculture field for many years. In spite of many advantages, overdose and abuse may cause environmental pollutions and antibiotic resistances. Many countries try to protect the environment, biospecies and food safety. Recently, Korea enact laws and ordinances such as the Aquatic Animal Disease Control Act. The purpose of this act to contribute to the stable production and control system for aquatic diseases. The Maximum residue limits (MRLs) of aquaculture drugs have been established by Ministry of Food and Drug Safety (MFDS) and Drug licensing was in National Fisheries Research and Development Institute (NFRDI) by Aquatic Animal Disease Control Act. There is 750 items in aquaculture drugs and these are classified into 4 group, which is approval, necessary for prescription, unregulated and safety drug, and banned drug. MRLs of 30 items in aquaculture drug have been established by Food Sanitation Act. Future research is required to determine the suitable for abundant varied fishes of drugs for side effects and safety.

• 아동학회지
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• 제32권2호
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• pp.15-34
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• 2011

The main purpose of this study was to examine pathways from interparental conflict to adolescents' problem behavior through maternal support and control and/or quality of peer relationship. A sample of 340 high school students (166 boys and 174 girls) in Incheon completed questionnaires on interparental conflict, maternal support and control, quality of peer relationship, and problem behavior. Data were analyzed by means of structural equation modeling. The results demonstrated that interparental conflict had a direct influence in both internalizing and externalizing problem behaviors, indicating that adolescents who perceived higher levels of interparental conflict had more problem behaviors. Regarding pathways from interparental conflict to problem behavior through maternal support and control and/or quality of peer relationships, adolescents perceiving higher levels of interparental conflict reported higher maternal psychological control and lower support and behavioral control. This was followed by a lower level of quality in terms of their peer relationships; the lower quality of peer relationships resulted in more adolescent problem behaviors. These results indicate that interparental conflict and maternal support and control play crucial roles in the development of internalizing and externalizing problem behavior, respectively.

• 한국화재소방학회논문지
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• 제24권3호
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• pp.106-112
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• 2010

본 연구는 제연구역 출입문의 자동폐쇄장치의 개발을 위한 기초 연구의 일환으로 자동폐쇄장치의 운동해석을 수행하였다. 본 연구는 자동폐쇄장치의 프로세스와 자동폐쇄조절장치의 운동 메커니즘 정립과 기구 모델링을 바탕으로 자동폐쇄장치의 해석이론을 정립하였고, 해석이론을 바탕으로 한 운동해석 시뮬레이션을 통해 폐쇄력 장치를 선정하고 자동폐쇄조절장치의 각 요소를 설계할 수 있는 엔지니어링 데이터 축과 원천기술을 확립하였다. 따라서 본 연구로부터 자동폐쇄장치 개발의 유연성과 탄력성을 줄 수 있고, 또한 자동폐쇄장치의 개발로 인한 연기의 제어수단과 기술적 대책을 마련하고 제연시스템의 높은 신뢰성과 안정성을 확보할 수 있을 것으로 본다.

• 가정과삶의질연구
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• 제26권3호
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• pp.191-201
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• 2008

This study examined how preschool children's age and mothers' modes of verbal control affect children's lying. A sample of 108 preschool children aged from 3 to 6 participated in a lying experiment. Their mothers answered questionnaires regarding the mothers' modes of verbal control. Preschool children's lying was measured by the Guessing Game Experiment developed by Talwar and Lee(2002). Mothers' modes of verbal control were measured by Jung's(2005) scale for preschool children. To analyze the data, crosstabs and logistic regression analyses were conducted. The results of the experiment showed that three-year-old children are able to lie intentionally. The older preschool children lied more than the younger ones. Mothers' imperative and personal modes of verbal control were positively related to preschool children's lying. The most significant variable on preschool children's lying was mother's imperative modes of verbal control, followed by personal modes of verbal control, which emphasizes the crucial influence of parenting on preschool children's lying.

• International Journal of Control, Automation, and Systems
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• 제2권3호
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• pp.374-383
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• 2004

This paper presents a neural network adaptive controller for autonomous diving control of an autonomous underwater vehicle (AUV) using adaptive backstepping method. In general, the dynamics of underwater robotics vehicles (URVs) are highly nonlinear and the hydrodynamic coefficients of vehicles are difficult to be accurately determined a priori because of variations of these coefficients with different operating conditions. In this paper, the smooth unknown dynamics of a vehicle is approximated by a neural network, and the remaining unstructured uncertainties, such as disturbances and unmodeled dynamics, are assumed to be unbounded, although they still satisfy certain growth conditions characterized by 'bounding functions' composed of known functions multiplied by unknown constants. Under certain relaxed assumptions pertaining to the control gain functions, the proposed control scheme can guarantee that all the signals in the closed-loop system satisfy to be uniformly ultimately bounded (UUB). Simulation studies are included to illustrate the effectiveness of the proposed control scheme, and some practical features of the control laws are also discussed.