• Title/Summary/Keyword: Internal Model Control

Search Result 838, Processing Time 0.032 seconds

Enhancement of Internal Control by expanding Security Information Event Management System

  • Im, DongSung;Kim, Yongmin
    • Journal of the Korea Society of Computer and Information
    • /
    • v.20 no.8
    • /
    • pp.35-43
    • /
    • 2015
  • Recently, internal information leaks is increasing rapidly by internal employees and authorized outsourcing personnel. In this paper, we propose a method to integrate internal control systems like system access control system and Digital Rights Managements and so on through expansion model of SIEM(Security Information Event Management system). this model performs a analysis step of security event link type and validation process. It develops unit scenarios to react illegal acts for personal information processing system and acts to bypass the internal security system through 5W1H view. It has a feature that derives systematic integration scenarios by integrating unit scenarios. we integrated internal control systems like access control system and Digital Rights Managements and so on through expansion model of Security Information Event Management system to defend leakage of internal information and customer information. We compared existing defense system with the case of the expansion model construction. It shows that expanding SIEM was more effectively.

Internal Model Control of UPS Inverter using Resonance Model

  • Park J. H.;Kim D. W.;Kim J. K.;Lee H. W.;Noh T. K.;Woo J. I.
    • Proceedings of the KIPE Conference
    • /
    • 2001.10a
    • /
    • pp.184-188
    • /
    • 2001
  • In this paper, a new fully digital control method for single-phase UPS inverter, which is based on the double control loop such as the outer voltage control loop and inner current control loop, is proposed. The inner current control loop is designed and implemented in the form of internal model control and takes the presence of computational time-delay into account. Therefore, this method provides an overshoot-free reference-to-output response. In the proposed scheme, the outer voltage control loop employing P controller with resonance model implemented by a DSP is introduced. The proposed resonance model has an infinite gain at resonant frequency, and it exhibits a function similar to an integrator for AC component. Thus the outer voltage control loop causes no steady state error as regard to both magnitude and phase. The effectiveness of the proposed control system has been demonstrated by the simulation and experimental results respectively.

  • PDF

정보시스템 사용에 대한 내부통제 효과성이 정보역량에 미치는 영향에 관한 연구

  • Lee, Jae-Beom;Kim, Sang-Su;Im, Byeong-U
    • 한국경영정보학회:학술대회논문집
    • /
    • 2007.11a
    • /
    • pp.117-122
    • /
    • 2007
  • Recently, as the management environments are changing rapidly and the uncertainty is becoming larger, the needs of internal control for management and IS become stronger. In order to construct a new internal control system for IS, it is necessary to evaluate the former research of the system. This study emphasizes the importance of effective internal control system, presents a conceptual framework for the preceding factors to consider, and verifies empirically the framework. This study sets the organization citizenship behavior, IS innovation resistance, and IT capability from the viewpoint of Socio-Technical system as the preceding factors for the effectiveness of internal control system. A research model, affecting the above factors on IS capability as a mediating variable of the internal control effectiveness for the use of IS, is set up. PLS-Graph 3.0 is used to verify the model. We found that the internal control effectiveness have affirmative effect on information capability, a surrogate variable of the IS effectiveness and a mediation effect is meaningful.

  • PDF

Model Tracking Dual Stochastic Controller Design Under Irregular Internal Noises

  • Lee Jong-Bok;Cho Yun-Hyun;Ji Tae-Young;Heo Hoon
    • Journal of Mechanical Science and Technology
    • /
    • v.20 no.5
    • /
    • pp.652-657
    • /
    • 2006
  • Although many methods about the control of irregular external noise have been introduced and implemented, it is still necessary to design a controller that will be more effective and efficient methods to exclude for various noises. Accumulation of errors due to model tracking, internal noises (thermal noise, shot noise and 1/f noise) that come from elements such as resistor, diode and transistor etc. in the circuit system and numerical errors due to digital process often destabilize the system and reduce the system performance. New stochastic controller is adopted to remove those noises using conventional controller simultaneously. Design method of a model tracking dual controller is proposed to improve the stability of system while removing external and internal noises. In the study, design process of the model tracking dual stochastic controller is introduced that improves system performance and guarantees robustness under irregular internal noises which can be created internally. The model tracking dual stochastic controller utilizing F-P-K stochastic control technique developed earlier is implemented to reveal its performance via simulation.

Robust Internal Model Control of Three-Phase Active Power Filter for Stable Operation in Electric Power Equipment (전력설비의 안정한 운용을 위한 3상 능동전력필터의 강인한 내부모델제어)

  • Park, Ji-Ho;Kim, Dong-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.10
    • /
    • pp.1487-1493
    • /
    • 2013
  • A new simple control method for active power filter, which can realize the complete compensation of harmonics is proposed. In the proposed scheme, a model-based digital current control strategy is presented. The proposed control system is designed and implemented in a form referred to as internal model control structure. This method provides a convenient way for parameterizing the controller in term of the nominal system model, including time-delays. As a result, the resulting controller parameters are directly set based on the power circuit parameters, which make tuning of the controllers straightforward task. In the proposed control algorithm, overshoots and oscillations due to the computation time delay is prevented by explicit incorporating of the delay in the controller transfer function. In addition, a new compensating current reference generator employing resonance model implemented by a DSP(Digital Signal Processor) is introduced. Resonance model has an infinite gain at resonant frequency, and it exhibits a band-pass filter. Consequently, the difference between the instantaneous load current and the output of this model is the current reference signal for the harmonic compensation.

Two-Degrees-Of-Freedom Internal Model Position Control for Slave Manipulator Teleoperated by Master Arm

  • Park, Byung-Suk;Kim, Dong-Gi;Jin, Jae-Hyun;Ahn, Sung-Ho;Song, Tae-Gil;Yoon, Ji-Sup
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2002.10a
    • /
    • pp.108.5-108
    • /
    • 2002
  • Recently, the more advanced control technologies are required to deal with the fast and accurate motion in manipulators. For these requirements, many manipulator control methods have been developed such as a computed torque method. This paper proposes a design method, a two-degrees-of-freedom internal model control (TDOF IMC), of the manipulator position control based on combination of the one-degree-of-freedom internal model control (ODOF IMC) system and the disturbance observer. The proposed control scheme is implemented for the position control, which leads the slave manipulator to the desired location by the master arm. The experimental results are presented and discussed through the imp...

  • PDF

Robust Trajectory Control of Robot Manipulators Using Time Delay Estimation and Internal Model Concept (로봇 매니퓰레이터를 위한 시간지연추정과 내부모델개념을 결합한 강인제어기에 관한 연구)

  • Cho Geon Rae;Chang Pyung-Hun;Jung Je Hyung
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.28 no.8 s.227
    • /
    • pp.1075-1086
    • /
    • 2004
  • In this paper, Time Delay Control(TDC) for robot manipulators is analyzed and its problems are founded. In order to remedy the problems, the enhanced controller is proposed and analyzed. The effect of friction associated with TDC is reported and its cause is presented. Through the analysis, simulation and experiment, it is shown that the friction effect causes serious degradation in control performance and that it is a result of the error of Time Delay Estimation(TDE) in TDC. In order to remedy the problems, TDC combined with Internal Model Control(IMC) concept is proposed. The proposed compensator is effective enough to handle the bad effect of friction, and is so simple and efficient as to match positive attribute of TDC. The simulation and experimental results show the effectiveness of proposed controller against the friction of the robot manipulators.

정보시스템 사용에 대한 내부통제 효과성이 정보역량에 미치는 영향에 관한 연구

  • Lee, Jae-Beom;Kim, Sang-Su;Lee, Jae-Cheol
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2007.11a
    • /
    • pp.58-63
    • /
    • 2007
  • Recently, as the management environments are changing rapidly and the uncertainty is becoming larger, the needs of internal control for management and IS become stronger. In order to construct a new internal control system for IS, it is necessary to evaluate the former research of the system. This study emphasizes the importance of effective internal control system, presents a conceptual framework for the preceding factors to consider, and verifies empirically the framework. This study sets the organization citizenship behavior, IS innovation resistance, and IT capability from the viewpoint of Socio-Technical system as the preceding factors for the effectiveness of internal control system. A research model, affecting the above factors on IS capability as a mediating variable of the internal control effectiveness for the use of IS, is set up. PLS-Graph 3.0 is used to verify the model. We found that the internal control effectiveness have affirmative effect on information capability, a surrogate variable of the IS effectiveness and a mediation effect is meaningful.

  • PDF

Effects of Control Attribution, Demand-Control-Support Model, and Control Strategy on Elderly Workers' Subjective Well-Being (노인 일자리 사업 참여자의 통제 귀인과 활동의 요구-조절-지지 정도 및 통제 전략이 자신의 주관적 안녕감에 미치는 영향)

  • Cho, Yoon-Joo
    • Journal of the Korean Home Economics Association
    • /
    • v.48 no.8
    • /
    • pp.13-26
    • /
    • 2010
  • This study tested the path model with regard to how certain variables (control attribution, demand-control-support of activity, and control strategy) affected the elderly workers' subjective well-being(swb). In the path model, the exogenous variables were internal and external control attribution. We used demand-control-support of activity, and primary and secondary control strategies as mediating variables. The endogenous variable was each elderly worker's swb. Study participants were 205 elders participating in an "education activity". We used descriptive statistical analysis, Pearson's correlation and hierarchical multiple regression to examine data collected from structured interviews with the participants. Path analysis revealed the followings: First, secondary control strategy was the strongest predictor of participants' swb but internal control attribution, demand of activity, and support of activity also positively affected participants' swb. Second, internal control attribution indirectly affected the participants' swb. Finally primary control strategy negatively affected on the participants' swb.

Design of Generalized Model-based Disturbance Rejection Controller with Two Loops (두 개의 루프를 갖는 일반화된 모델 기반의 외란 제거 제어기 설계)

  • 최현택;김봉근;엄광식
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.10 no.5
    • /
    • pp.385-394
    • /
    • 2004
  • This paper proposes the generalized structure of a model-based disturbance rejection controller called a Robust Internal-loop Compensator (RIC). The framework consists of the RIC in the internal-loop to eliminate disturbances and a feedback controller in the external-loop to achieve nominal control performance. As the main contribution of this paper, we redefine the design problem of the RIC as a regulation control problem, then show that this new definition with the RIC structure provides more design flexibility and less implementation constraints. This is verified through a comparative structural analysis with Disturbance Observer (DOB) and Adaptive Robust Control (ARC). Two design examples of the RIC are given, along with practical issues that should be considered in the design procedure. The proposed framework is demonstrated by simulations of a rotary-type motor and experiments with a linear-type motor system.