• 제어로봇시스템학회논문지
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• 제10권5호
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• pp.395-401
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• 2004

We present an AILC(Adaptive Iterative Learning Control) scheme and a sufficient condition for system parameter identification for uncertain robotic systems that perform the same tasks repetitively. It is guaranteed that the joint velocity and position asymptotically converge to the reference joint velocity and position, respectively. In addition, it is proved that a sufficient condition for parameter identification is the PE(Persistent Excitation) condition on the regressor matrix evaluated at the reference trajectory during the operation period. Since the regressor matrix on the reference trajectory can be easily computed prior to the real robot operation, the proposed algorithm provides a useful method to verify whether the parameter error converges to zero or not.

• 한국소음진동공학회논문집
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• 제11권4호
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• pp.22-30
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• 2001

In this paper, active control of vibrational intensity at a reference point in an infinite, elastic plate was discussed. The plate is excised harmonically by a vibrating source, which has a vertical point force. The optimal condition of controller was investigated to minimize the vibrational intensity being transmitted from the vibrating source to a reference point. Hence the method of feedforward control was employed for the control strategy and then the cost function was evaluated to find the optimal control force. Three types of control force (Vertical force, Moment, and Coupling force (a set of vertical force and moment) ) and controller's positions were examined to define the optimal condition of the controller. The vibrational intensity at a reference point was found to be reduced down to a zero level, compared with the uncontrolled case. Especially maximum reduction of vibrational intensity was achieved when the controller was collinearly positioned between a vibrating source and a reference point.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 춘계종합학술대회
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• pp.569-572
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• 2004

다수의 사람들이 관리ㆍ운영하는 많은 분량의 HTML 문서들로 이루어진 웹사이트들의 경우에는 현수참조(Dangling Reference)와 오문참조(Inaccurate Contents Reference)와 같은 깨진 링크(Broken Link)를 관리하는데 많은 어려움이 따른다. 즉, HTML 페이지의 내용 중 연결구조에 관련된 부분을 변경하거나 삭제하는 경우 문서들간의 연결구조에 대한 무결성(Integrity)을 보장하기가 어렵다. 본 논문에서는 Parent 페이지와 Child 페이지에서의 무결성 제약조건(Integrity Constraint Condition)들을 조사하여 정의하고, 확장 UML로 표현하는 방법에 대해 연구하였다.

• 한국문헌정보학회지
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• 제21권
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• pp.141-168
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• 1991

The Purpose of this study is to explore and analyse ways of enhancing the effectiveness of reference service through reference evaluation. Marketing research technique combined with pre-evaluation theory was applied in this study to find out information for practice the service based on current concept of reference service. Aims and results of this study can be summarised as follows: First, the evaluation of effectiveness of reference service should be conducted for the purpose of finding out the ways of increasing user's satisfaction. Second, the policy evaluation was understood as the appropriated evaluation concept. The policy evaluation in principle coincides with reference service in sense that the satisfaction of public should have priority and hence be the criterion of the evaluation. Third, marketing research based on recently developed 'marketing concept', which concentrates all its efforts to meet user's demand and attempt to acquire the information for better marketing management of non-profit organization such as library, is examined to find out the evaluation method practically applicable to the pre-evaluation of reference service. In this study , conjoint analysis was adopted as the method of pre-evaluation about reference service. The Reference Room of the Central Library Yonsei University, was selected as the arget sample to find out the expected condition for the maximization of the user's satisfaction from the reference service. Based on this example study, the analysis indicates as the most desirable combination for reference service in terms of the user's satisfaction is following condition: the younger librarian with aimable personality who displays willingness In his/her assistance, plus as the method of reference service, sufficient and practical introduction to the reference materials available, plus immediate and satisfactory result of the service, and finally a library equipped with inter-library use system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(1)
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• pp.279-282
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• 2002

Here we introduce so called Reference code-weighted sum of all PN codes used in the system-. We do inner product operation between received PN code and Reference code rather than locally generated PN code in the receiver. Acquisition process can be accomplished by only one inner product during full period of PN code. It's essential innovation against present method which can be viewed successive hypothesis test by inner product for entire candidate PH codes set. Well -defined decision region makes it possible. We suggest the. criterion fur designing the decision region and find a condition for weight (coefficient) of Reference code.

• Journal of Positioning, Navigation, and Timing
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• 제8권3호
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• pp.129-138
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• 2019

In this work, we propose detection method for ionosphere storm that occurs locally using widespread GNSS reference stations. For ionosphere storm detection, we compare ionosphere condition with other reference stations and estimate direction of movement based on ionosphere time variation. The method use carrier phase measurement of dual frequency, for accuracy and precision of test statistics, are evaluated with multiple GNSS reference stations data.

• 한국심리학회지 : 문화 및 사회문제
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• 제24권1호
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• pp.29-47
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• 2018

사회적 상황은 개인의 정보처리와 정서경험에 영향을 주는가? 본 논문에서는 두 개의 연구를 통해 사회적 정보처리와 자기참조효과 및 정서경험의 관계를 검증하였다. 연구 1에서는 외부의 명시적 지시없이도 자기개념이 자동적으로 활성화되어, 도형과제를 통해 자신과 연관된 자극의 처리가 친구/타인과 연관된 자극의 처리보다 더 수월한지를 검증했다. 그 결과 자신을 표상하는 자극의 처리가 친구/타인에 대한 자극처리보다 더 촉진되는 경향이 나타났다. 연구 2에서는 참가자들에게 다양한 단어를 보여주고, 자신이 선택한 단어 또는 친구가 선택한 단어라는 설명과 함께 제시된 단어에 대한 기억을 비교하였다. 그 결과 참가자들은 혼자 과제를 수행하는 비사회적 조건에서 친구와 함께 과제를 수행하는 사회적 조건보다 자신이 선택한 단어를 더 많이 기억하는 경향이 나타났다. 이에 비해 사회적 조건에서는 참가자들이 친구가 선택한 단어를 자신이 선택한 단어보다 더 많이 기억하였다. 또한 사회적 조건에서는 실험상황에서 초콜릿 경험에 대해 보고한 긍정적 정서의 강도가 비사회적 조건보다 더 높게 나타났다. 이 결과는 사회적 정보처리가 자동적 자기참조효과를 감소시키며, 타인과의 경험공유는 정서경험을 증폭시킬 가능성을 시사한다.

• 한국기록관리학회지
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• 제8권2호
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• pp.105-125
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• 2008

본 문은 중국의 기록물 공개 및 서비스에 관한 제도와 인터넷을 통한 온라인 서비스 현황을 고찰하였다. 중국의 기록물공개와 서비스 제도의 고찰을 위하여 1949년 중화인민공화국 성립 후에 반포된 각종 법규의 기록물의 공개와 서비스에 관한 주요 내용을 살펴보았다. 중국 기록관의 온라인 서비스 건설 현황 및 북경시기록관 사이트의 인터넷을 통한 온라인 서비스를 분석하였다.

• 전력전자학회논문지
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• 제20권4호
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• pp.356-362
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• 2015

This paper presents a current control strategy in the synchronous reference frame for a single-phase PWM converter, which ensures sinusoidal input current control under the distorted source voltage and frequency condition. Given that the distorted source voltage distorts the phase angle for PWM converter control, the input current contains the same harmonics as the source voltage. Aside from the distorted voltage, the variation in source frequency reduces the performance of input current control. To achieve sinusoidal input current control under the distorted source voltage and frequency condition, this paper proposes a compensation strategy of current reference with the distortion component extracted from the phase angle and a detection strategy of frequency variation from the output of a synchronous reference frame phase-lock loop. The experimental results confirm the validity of the proposed method under the distorted source voltage and frequency condition.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.361-364
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• 1997

The re-enty guidance design involves trajectory optimization, generation of a reference drag acceleration profile with the satisfaction of trajectory constraints. This reference drag acceleration profile can be considered as the reference trajectory. This paper proposes the atmospheric re-entry system which is composed of longitudinal, later and range control. This paper shows the a performance of a re-entry guidance and control system using feedback linearization control and predictive control.