• Journal of Positioning, Navigation, and Timing
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• 제11권3호
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• pp.209-215
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• 2022

As intelligent autonomous driving vehicle development has become a big topic around the world, accurate reference dynamics estimation has been more important than before. Current systems generally use speed and heading information sensed from a distant point as a vehicle reference dynamic, however, the dynamics between different points are not same especially during rotating motions. In order to estimate properly estimate the reference dynamics from the information such as velocity and heading sensed at a point distant from the reference point such as center of gravity, this study proposes estimating reference dynamics from any location in the vehicle by combining the Bicycle and Ackermann models. A test system was constructed by implementing multiple GNSS/INS equipment on an Robot Operating System (ROS) and an actual car. Angle and speed errors of 10° and 0.2 m/s have been reduced to 0.2° and 0.06 m/s after applying the suggested method.

• 기록학연구
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• 제13호
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• pp.287-320
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• 2006

기록을 관리하는 궁극의 목적은 이용 제공에 있다. 기록물전시회는 기록관 및 기록관리에 대한 대중적 인지도를 높이고, 이에 대한 관심을 제고시킬 수 있는 기회가 된다. 또한, 미지의 이용자에게 적극적으로 접근하여 서비스를 제공할 수 있다. 아울러, 아키비스트에게는 소장하고 있는 기록물에 대한 개괄적인 분류 및 평가를 할 수 있는 기회를 제공하기도 한다. 이러한 기록전시의 기능과 중요성에도 불구하고 기록물전시회를 개최한 기관 및 단체는 아직 많지 않은 형편이다. 본고에서는 대한불교조계종 중앙기록관의 역사기록전시 사례를 바탕으로 전시기획, 기록물 선별 및 전시 실제에 대하여 소개함으로써 기록전시의 참고 유형을 제시하고자 한다.

• 한국도서관정보학회지
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• 제24권
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• pp.221-242
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• 1996

The purpose of this study is to investigate the teaching methods a n.0, pplied to the basic reference education. Especially, the independent study method in reference education-PSI, AT and PI method used in 1970s at the library schools in the United States was examined in detail. The conclusions and suggestions drawn from this study are as follows : 1) The studies concerned with the teaching method in library and information science education in Korea is very scarce. Studies in this area are needed. 2) In order to improve and innovate the teaching method, instructor' knowledge and understanding of the various teaching methods are essential. The library and information science instructors' efforts should be made in this respect. 3) Instructional materials developed through the research activities concerned with teaching method should be shared among the instructors of the reference education and the device for such sharing should be made.

• 한국도서관정보학회지
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• 제10권
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• pp.59-94
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• 1983

Through the close examination of characteristics of adolescent, social institutions and its programs, and newly added and expanded library reference services. it is founded that new role and qualifications of young adult reference librarians are prerequisite subject. The following are the summary of new role and qualifications of specialized young adult reference librarianship. 1. Adequate training and education for the YA librarians is needed in order to have understanding of their characteristics (physiology, psychology, personality etc.). 2. Because of librarian's unique exposure to human relations and their personal awareness of other people's need, YA librarian should bring a person-centered managerial technique. 3. Librarianship may not have a clinical counseling function but to provide right answer or information, the librarian become counselor inescapably. 4. Librarians are not professionally trained to be experts on counseling in sex education. However, librarians can play an important role in educating YA by committing book selection, reader's advisory, referral services, library programming and staff development planning.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.2077-2078
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• 2006

This paper describes the development or a closed-loop Strapdown Attitude Reference System (SARS) algorithm integrated filtering estimator for determining attitude reference for railway and aviation system using fuzzy inference. The SARS consists of 3 single-axis rate gyms in conjunction with 2 single-axis accelerometers. For optimal values of fuzzy systems, we utilize on-line scheduling method for initial values and then use genetic algorithms for fine tuning. Implementation using experimental test data of unmanned aerial vehicle has been performed in order to verify the estimation. The proposed fuzzy inference based SARS demonstrate that more accurate performance can be achieved in comparison with conventional one. The estimation results were compared with the on-board vertical gyro as the reference standard.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.585-586
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• 2008

In this paper, a novel beta-multiplier reference current source circuit for the 800mV power-supply voltage is presented. In order to cope with the narrow input common-mode range of the OpAmp in the reference circuit, shunt resistive voltage divider branches were deployed. High gain OpAmp was designed to compensate intrinsic low output resistance of the MOS transistors. The proposed reference circuit was designed in a standard 0.18um CMOS process with nominal Vth of 420mV and -450mV for nMOS and pMOS transistor respectively. The total power consumption including OpAmp is less than 50uW.

• Journal of Mechanical Science and Technology
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• 제19권spc1호
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• pp.357-363
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• 2005

The non-minimum phase characteristic of a flexible manipulator makes tracking control of its tip difficult. The level of the tip tracking performance of a flexible manipulator is significantly affected by the characteristics of the tip reference trajectory as well as the characteristics of the flexible manipulator system. This paper addresses the question of how to best specify a reference trajectory for the tip of a flexible manipulator to follow in order to achieve the objectives of reducing : tip tracking error, residual tip vibration, and the required actuation effort at the manipulator joint. A novel method of tip-based learning controller for the flexible manipulator system is proposed in the paper, where a model of the flexible manipulator system with a command shaping filter is used to generate a smooth and realizable tip reference trajectory for a tip-based learning controller.

• 한국문헌정보학회지
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• 제29권
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• pp.305-343
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• 1995

The purposes of this study are to confirm the applicability of the unobtrusive evaluation to Korean libraries, to develop survey forms, check lists and evaluation criteria appropriate for Korean libraries, to analyze the relationship between the test variables and the performance level, to find out the causes of poor service if any, and to propose measures for improving the quality of reference services. The main results of the analyses are as follows : $\cdot$ The accuracy of answers was correlated to appropriateness of search process, way of providing answer, usage of language, approachability and use of second materials in the order named. That is, there was a strong correlation between accuracy and the variables related to librarian's behavior. $\cdot$ There was no statistically significant relationship between accuracy and the environmental aspects of reference department such as number of professional librarians, self-evaluation of reference collection, etc. $\cdot$ The main reasons for failing to give accurate answers were found to be weaknesses in understanding questions. developing search strategy logically and relating the querries to available information sources.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.57-59
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• 2006

In order to apply the network adjustment, the correct ambiguities between each of reference stations must be calculated. This paper focused on the comparison of ambiguity resolution between the reference stations. Three hours test data with different baseline length from 20 km to 60 km have been analyzed. The results show that the time-to-fix between 20 km and 40 km is typically under 1 minute. However, over 60km baseline, the time-to-fix performance degrades.

• Journal of Advanced Marine Engineering and Technology
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• 제29권3호
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• pp.251-259
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• 2005

A discrete time model reference adaptive control has been applied in order to compensate the nonlinear friction characteristics in a hydraulic proportional position control system. As nonlinear friction, static and coulomb friction forces are considered and modeled as dead zone and external disturbance respectively. The model reference adaptive control system consists of a cascade combination of the dead zone. external disturbance and linear dynamic block. For adaptive control experiment. the DSP(Digital Signal Processor) board has been interfaced the hydraulic proportional position control system. The experimental results show that the MRAC(Model Reference Adaptive Control) for compensation of static and coulomb friction are very effective.