• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 Proceedings of Pre-symposium of the 10th ISWPC
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• pp.130-139
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• 1999

In order to manage the wet end chemistry on paper machines, our goal is to control sub-processes through which we can influence the entire wet end operations with maximum effect. The most important sub-processes are: consistency, ash, and chemistry. The management of these three main groups is based on on-line maesurements and automatic control. This paper presents a new wet end management platform, a new analyzer. This new analyzer utilizes a modular structure and modem software. It is part of a new paper machine concept. The controls of this concept are feedback and feedforward solutions that control retention, consistencies, ash, and charge, resulting in a more stable wet end (30...80%), more uniform paper, and better rnnability.

• 한국산학기술학회논문지
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• 제7권6호
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• pp.1134-1141
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• 2006

자바는 실행 플랫폼에 독립적이고 모바일 분야(J2ME)로부터 엔터프라이즈 환경(J2EE)에 이르는 다양하고도 일관된 솔루션을 제공하여 이기종 분산 애플리케이션 환경을 위해 적합한 개발 도구로 평가받고 있다. 본 연구에서는 자바 애플리케이션을 개발할 때 필요로 하는 접근제어 모듈을 자바 패키지 형태로 구현하여 제공함으로써 애플리케이션의 개발 기간을 단축시키고 시스템 관리자들이 보다 편리하게 접근제어 관리를 할 수 있도록 하였다. 구현된 모듈은 역할기반 접근제어(RBAC) 모델을 기초로 하고 자바 패키지 및 접근제어 관리도구를 포함한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.159-161
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• 1994

A new control technique which generates high-quality sinusoidal output voltage from a single-phase resonant do link inverter suitable for the UPS systems is presented. The inverter output voltage control system has the PID controller with a minor loop of the filter inductor current and tile feedforward controller. The proposed control scheme also solves resonant voltage overshoot without any additional switch or passive component, resulting in pulses with uniform amplitude and high efficiency. Experimental results in the case of linear and nonlinear loads are presented to confirm the usefulness of the Proposed control algorithms.

• 대한기계학회논문집A
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• 제29권1호
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• pp.139-144
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• 2005

A vehicle cruise control algorithm using an Interacting Multiple Model (IMM)-based Multi-Target Tracking (MTT) method has been presented in this paper. The vehicle cruise control algorithm consists of three parts; track estimator using IMM-Probabilistic Data Association Filter (PDAF), a primary target vehicle determination algorithm and a single-target adaptive cruise control algorithm. Three motion models; uniform motion, lane-change motion and acceleration motion. have been adopted to distinguish large lateral motions from longitudinal motions. The models have been validated using simulated and experimental data. The improvement in the state estimation performance when using three models is verified in target tracking simulations. The performance and safety benefits of a multi-model-based MTT-ACC system is investigated via simulations using real driving radar sensor data. These simulations show system response that is more realistic and reflective of actual human driving behavior.

• 한국정밀공학회지
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• 제13권9호
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• pp.94-103
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• 1996

This paper is concerned with the theroretical and experimental study on the force control of a miniature robotic finger that grasps an object at three other positions with the fingertip. The artificial finger is uniform flexible cantilever beam equipped with a distributed set of compact grasping force secnsors. Control action is applied by a qiexoceramic bimorph strip placed at the base of the finger. The mathematical model of the assembled electro-mechanical system is developed. The distributed sensors are described by a set of concentrated mass-spring system. The formulated equations of motion are then applied to a control problem which the finger is commanded to grasp an object The PID-controller is introduced to drive the finger. The usefulness of the proposed control technique is verified by simulation and experiment.

• 산업융합연구
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• 제21권3호
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• pp.139-148
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• 2023

본 연구는 강원도 일개 대학 4년제 치위생학과 276명을 대상으로 2021년 11월 24일부터 11월 26일까지 구글 온라인설문을 통하여 연구하였다. 본 연구의 목적은 유니폼의 감염인식과 세탁 규정 인식, 감염병 예방 의도를 개인주의 및 집단주의 자아존중감을 통해 알아보는 것으로, 향후 감염병 시기에 학생의 감염 교육 방법 모색을 위해 시행되었다. 통계는 SPSS Statistics 24.0, AMOS 21.0을 사용하여 빈도 분석, 탐색적 요인분석, 확인적 요인분석, 신뢰도 분석, 구조방정식, ANOVA 분석을 시행하였다. 연구결과 유니폼 감염인식, 유니폼 세탁 규정 인식, 자아존중감, 개인주의, 집단주의 감염병 예방 의도의 모형이 적합함을 확인하였고(p<.001), 구조방정식 결과 자아존중감은 개인주의, 집단주의 감염병 예방 의도에 영향을 미치는 것으로 나타났다(p<.001). 집단주의는 유니폼 감염인식, 유니폼 세탁 규정 인식, 감염병 예방 의도에 영향을 미치는 것으로 나타나 감염예방을 위한 인식 변화에 자아존중감과 집단주의가 영향을 미치는 것을 확인하였다. 향후 치위생학과의 감염관리 교육시 집단주의를 고려한 유니폼 세탁 방법에서 활용이 가능할 것이다.

• 제어로봇시스템학회논문지
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• 제7권8호
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• pp.680-688
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• 2001

In this paper, the fuzzy control with variable input gain is applied to maintain the consistent tension in the process of taking up and releasing texture. In the process of discharging web on one side rolling it on another, the take-up drum gets smaller on the release drum side as it gets bigger on the rolling side, thus it is necessary to change the balance of velocity between the sides. In order to solve the problem a tension controller is necessary. The PI control method has been employed to maintain the consistent tension, but the PI control method produces a problem which requires an experienced worker with the traits of the machine, in order to perform the fine adjustments according to the environment of the process. For solving the above problem, we apply fuzzy control to the tension system, in order to produce a uniform roll. For the performance test, the fuzzy controller does not need to revise the parameters. Therefore the fuzzy controller exhibits an excellent additivity for the tension system where the system is changed with time.

• 제어로봇시스템학회논문지
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• 제19권10호
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• pp.947-954
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• 2013

This article focuses on a hemispherical resonator gyro driven by the Coriolis effect. The operational principle of resonator gyros and mathematical models are introduced. These models are useful to explain the behavior of a resonator and to design controllers. Several control tests of a resonator have been done. A resonator has been excited by electromagnets controlled by a computer. Its amplitude has been adjusted by a PI control. The transient response is matched with a simulation result based on a mathematical model. A vibrating pattern may drift due to non-uniform factors of a resonator. The drift of the vibrating pattern is controlled and aligned to a reference direction by a PI control. These results are very useful to understand the behavior of resonator gyros and to design advanced control algorithm for better performance.

• Journal of Advanced Marine Engineering and Technology
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• 제18권4호
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• pp.102-111
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• 1994

This article deals with the problem of designing a robust algorithm for the motion control of robot manipulator whose nonlinear dynamics contain various uncertainties. To ensure high performance of control system, a model-based feedforward compensation with continuous robust control has been developed. The control structure based on the deterministic approach consists of two parts : the nominal control law is first introduced to stabilize the system without uncertainties, then a robust nonlinear control law is adopted to compensate for both the resulting errors(or structured uncertainties) and unstructured uncertainties. The uncertainties assumed in this study are bounded by polynomials in the Euclidean norms of system states with known bounding coefficients. The presented control scheme is relatively simple as well as computationally efficient. With a feasible class of desired trajectories, the proposed control law provides sufficient criteria which guarantee that all possible responses of the closed-loop system are uniformly ultimately bounded in the presence of uncertainties. Therefore, the control algorithm proposed is shown to be robust with respect to the involved uncertainties.

• 제어로봇시스템학회논문지
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• 제2권2호
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• pp.73-80
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• 1996

This paper proposes a stabilizing controller for the multirate sampled-data systems which have a periodic output measurement scheme. A sufficient condition for maintaining observability in the multirate sampled-data system is derived and a design strategy for disturbance rejection is proposed. The proposed controller has IMC structure, and can be decomposed into the disturbance estimator and the inverse of the fast uniform sampled plant. We assume that the plant is open-loop stable and the disturbance consists of a sum of finite number of sinusoids with different frequencies. An example is presented for illustrations.