• 제목/요약/키워드: active set strategy

검색결과 77건 처리시간 0.021초

행렬게임의 활성전략집합에 대한 감도분석 (Sensitivity analysis on the active strategy set in the matrix game)

  • 성기석
    • 경영과학
    • /
    • 제9권1호
    • /
    • pp.87-92
    • /
    • 1992
  • The purpose of this paper is to study the sensitivity analysis in the matrix game. The third type sensitivity analysis is defined as finding the characteristic region of an element of the payoff matrix in which the set of current active strategies is preserved. First by using the relationship between matrix game and linear programming, we induce the conditions which must be satisfied for preserving the set of current active strategies. Second we show the characteristic regions of active and inactive strategy. It is found that the characteristic regions we suggests in this paper are same with that of the type one sensitivity analysis suggested by Sung[3] except only one case.

  • PDF

A SOLVER FOR LARGE-SCALE INDEFINITE QUADRATIC PROGRAMS

  • Oh, Se-Young
    • Journal of applied mathematics & informatics
    • /
    • 제6권3호
    • /
    • pp.735-746
    • /
    • 1999
  • Based on an active set strategy a method for solving lin-early constrained indefinite quadratic programs to solve the correspond-ing system of equations at each iteration is presented. The algorithm takes two descent directions to strictly decrease the value of objective function and obtains a suitable step to maintain feasibility. Computa-tional results on a range of quadratic test problems are given.

최적 투자 포트폴리오 구성전략에 관한 연구 (A Study on the Strategy for Optimizing Investment Portfolios)

  • 구승환;장성용
    • 산업공학
    • /
    • 제23권4호
    • /
    • pp.300-310
    • /
    • 2010
  • This paper is about an optimal investment portfolio strategy. Financial data of stocks, bonds, and savings from January 2. 2001 through October 30. 2009 were utilized in order to suggest the optimal portfolio strategies. Fundamental analysis and technical analysis were used in stocks-related strategy, whereas passive investment strategy and active investment strategy were used in bond-related strategy. The score is assigned to each stock index according to the suggested strategies and set trading rules are based on the scores. The simulation has been executed about each 29,400-portfolios and we figured out with the simulation result that 26.75% of 7,864 portfolios are more profitable than average stock market profit (22.6%, Annualized). The outcome of this research is summarized in two parts. First, it's the rebalancing strategy of portfolio. The result shows that value-oriented investment(long-term investment) strategy yields much higher than short-term investment strategies of stocks or active investment of bonds. Second, it's about the rebalancing cycle forming the portfolios. The result shows that the rate of return for the portfolio is the best when rebalancing cycle is 12 or 18 months.

Active tendon control of suspension bridges

  • Preumont, Andre;Voltan, Matteo;Sangiovanni, Andrea;Mokrani, Bilal;Alaluf, David
    • Smart Structures and Systems
    • /
    • 제18권1호
    • /
    • pp.31-52
    • /
    • 2016
  • The paper first reviews the theory of active tendon control with decentralized Integral Force Feedback (IFF) and collocated displacement actuator and force sensor; a formal proof of the formula giving the maximum achievable damping is provided for the first time. Next, the potential of the control strategy for the control of suspension bridges with active stay cables is evaluated on a numerical model of an existing footbridge; several configurations are investigated where the active cables connect the pylon to the deck or the deck to the catenary. The analysis confirms that it is possible to provide a set of targeted modes with a considerable amount of damping, reaching ${\xi}=15%$. Finally, the control strategy is demonstrated experimentally on a laboratory mock-up equipped with four control stay cables equipped with piezoelectric actuators. The experimental results confirm the excellent performance and robustness of the control system and the very good agreement with the predictions.

Control strategy of the lever-type active multiple tuned mass dampers for structures

  • Li, Chunxiang;Han, Bingkang
    • Wind and Structures
    • /
    • 제10권4호
    • /
    • pp.301-314
    • /
    • 2007
  • The lever-type active multiple tuned mass dampers (LT-AMTMD), consisting of several lever-type active tuned mass dampers (LT-ATMD), is proposed in this paper to attenuate the vibrations of long-span bridges under the excitation directly acting on the structure, rather than through the base. With resorting to the derived analytical-expressions for the dynamic magnification factors of the LT-AMTMD structure system, the performance assessment then is conducted on the LT-AMTMD with the identical stiffness and damping coefficient but unequal mass. Numerical results indicate that the LT-AMTMD with the actuator set at the mass block can provide better effectiveness in reducing the vibrations of long-span bridges compared to the LT-AMTMD with the actuator set at other locations. An appealing feature of the LT-AMTMD with the actuator set at the mass block is that the static stretching of the spring may be freely adjusted in accordance with the practical requirements through changing the location of the support within the viable range while maintaining the same performance (including the same stroke displacement). Likewise, it is shown that the LT-AMTMD with the actuator set at the mass block can further ameliorate the performance of the lever-type multiple tuned mass dampers (LT-MTMD) and has higher effectiveness than a single lever-type active tuned mass damper (LT-ATMD). Therefore, the LT-AMTMD with the actuator set at the mass block may be a better means of suppressing the vibrations of long-span bridges with the consequence of not requiring the large static stretching of the spring and possessing a desirable robustness.

영구자석 동기 전동기의 토크 제어 및 토크 리플 저감을 위한 유한 제어요소 모델 예측제어(FCS-MPC) 설계 (Torque Tracking and Ripple Reduction of Permanent Magnet Synchronous Motor using Finite Control Set-Model Predictive Control (FCS-MPC))

  • 박효성;이영일
    • 전력전자학회논문지
    • /
    • 제19권3호
    • /
    • pp.249-256
    • /
    • 2014
  • This paper proposes a torque control method of permanent magnet synchronous motor, which has small torque ripple. The proposed control method is using the finite control set-model predictive control(FCS-MPC) strategy. An optimal input voltage vector minimizing a cost function is chosen among 6 passible active input voltage vectors following the FCS-MPC strategy. Then, a modulation factor for the optimal input voltage vector is computed to minimize the torque ripple. Thus, the proposed control method yields fast torque response and small torque ripple. The efficacy of the proposed method was verified through simulation and experiment.

시진핑(習近平) 시기 중국의 해군전략 특징 및 전략적 함의 (Characteristics and Strategic Implications of China's Naval Strategy during the Xi Jinping Era)

  • 안슬기
    • 해양안보
    • /
    • 제1권1호
    • /
    • pp.61-92
    • /
    • 2020
  • 본 논문은 중국의 시기별 해군전략의 전략운용 목표, 범위, 방식을 살펴보고, 시진핑 시기 해군전략의 목표와 특징, 전략적 함의를 분석해 보는 데 그 목적이 있다. 신(新)중국 성립 이후 해군은 현재까지 총 네 번에 걸쳐 전략변화를 구사하였다. 현재 시진핑 시기 중국의 해군전략은 근해적극방어전략이 결합된 원해호위전략이다. 현재 중국의 해군전략은 공격성 무기체계로 인해 공격적 전략으로 전환되고 있고, 최신식 함정의 비중이 높아지고 있으며, 운용범위는 연안과 근해를 벗어나 전 세계 해양이 대상이 되었다. 중국의 해군전략이 전환됨에 따라 중국 해군은 해양주도권 확보를 전략적 목표로 설정하고 외부 세력의 개입과 침입에 적극 대응하기 위한 공세적 전략을 실행할 것이다. 이에 중국 해군은 원거리 지역 해상 분쟁지역에서 분쟁당사국들을 더욱 압박하기 위해 억제전력과 기동전력을 향상시킬 것이다. 또한 중국의 해군전략은 '차단'에서 '신속대응'이라는 운용 방식으로 점차 전환될 것으로 전망한다.

  • PDF

퍼지추론을 이용한 DC모터의 규칙기반 제어기 설계 (Design of Rule-Based Controller for DC Motor using Fuzzy Reasoning)

  • 김성중;최한수;최종수;김영철;조훈
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1991년도 하계학술대회 논문집
    • /
    • pp.703-707
    • /
    • 1991
  • During the past several years, fuzzy control has emerged as one of the most active and fruitful areas for reaserch in the applications of fuzzy set theory. A key component of the fuzzy controller is a rule-based system which provides a linguistic description of control strategy. This strategy has the form of a collection of fuzzy conditional statements which are implemented and manipulated using fuzzy set theory. In this paper, we propose the rule-based controller for DC motor speed control. The result of performance compare with PID controller to verify the validity of proposed algorithm.

  • PDF

Revisited Security Evaluation on Midori-64 against Differential Cryptanalysis

  • Guoyong Han;Hongluan Zhao
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • 제18권2호
    • /
    • pp.478-493
    • /
    • 2024
  • In this paper, the Mixed Integer Linear Programming (MILP) model is improved for searching differential characteristics of block cipher Midori-64, and 4 search strategies of differential path are given. By using strategy IV, set 1 S-box on the top of the distinguisher to be active, and set 3 S-boxes at the bottom to be active and the difference to be the same, then we obtain a 5-round differential characteristics. Based on the distinguisher, we attack 12-round Midori-64 with data and time complexities of 263 and 2103.83, respectively. To our best knowledge, these results are superior to current ones.

Harmonic Current Compensation Using Active Power Filter Based on Model Predictive Control Technology

  • Adam, Misbawu;Chen, Yuepeng;Deng, Xiangtian
    • Journal of Power Electronics
    • /
    • 제18권6호
    • /
    • pp.1889-1900
    • /
    • 2018
  • Harmonic current mitigation is vital in power distribution networks owing to the inflow of nonlinear loads, distributed generation, and renewable energy sources. The active power filter (APF) is the current electrical equipment that can dynamically compensate for harmonic distortion and eliminate asymmetrical loads. The compensation performance of an APF largely depends on the control strategy applied to the voltage source inverter (VSI). Model predictive control (MPC) has been demonstrated to be one of the effective control approaches to providing fast dynamic responses. This approach covers different types of power converters due to its several advantages, such as flexible control scheme and simple inclusion of nonlinearities and constraints within the controller design. In this study, a finite control set-MPC technique is proposed for the control of VSIs. Unlike conventional control methods, the proposed technique uses a discrete time model of the shunt APF to predict the future behavior of harmonic currents and determine the cost function so as to optimize current errors through the selection of appropriate switching states. The viability of this strategy in terms of harmonic mitigation is verified in MATLAB/Simulink. Experimental results show that MPC performs well in terms of reduced total harmonic distortion and is effective in APFs.