• 제목/요약/키워드: Optimal control period

검색결과 371건 처리시간 0.035초

The Application of Optimal Control Through Fiscal Policy on Indonesian Economy

  • SYAHRINI, Intan;MASBAR, Raja;ALIASUDDIN, Aliasuddin;MUNZIR, Said;HAZMI, Yusri
    • The Journal of Asian Finance, Economics and Business
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    • 제8권3호
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    • pp.741-750
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    • 2021
  • The budget deficit is closely related to expansionary fiscal policy as a fiscal instrument to encourage economic growth. This study aims to apply optimal control theory in the Keynesian macroeconomic model for the economy, so that optimal growth can be found. Macroeconomic variables include GDP, consumption, investment, exports, imports, and budget deficit as control variables. This study uses secondary data in the form of time series, the time period 1990 to 2018. Performing optimal control will result in optimal fiscal policy. The optimal determination is done through simulation, for the period 2019-2023. The discrete optimal control problem is to minimize the objective function in the form of a quadratic function against the deviation of the state variable and control variable from the target value and the optimal value. Meanwhile, the constraint is Keynes' macroeconomic model. The results showed that the optimal value of macroeconomic variables has a deviation from the target values consisting of: consumption, investment, exports, imports, GDP, and budget deficit. The largest deviation from the average during the simulation occurs in GDP, followed by investment, exports, and the budget deficit. Meanwhile, the lowest average deviation is found in imports.

비선형이산치계의 최적시간제어에 관한 연구 (A Study of Time Optimal Control for Nonlinear Sampled-data Contral Systems)

  • 천희영
    • 전기의세계
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    • 제26권2호
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    • pp.84-88
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    • 1977
  • In this paper we apply the maximum principle to design of time optimal nonlinear sampled-data control systems. We introduce the general design procedures and the mathematical formalas for time optimal processes and trajectories. Then we show the application of the technique to determine the optimal control signal, control sequence, switching time and sampling period to the given 4th order process.

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성능 함수를 고려한 실시간 제어 테스크에서의 최적 체크 포인터 구간 선정 (Determination of Optimal Checkpoint Interval for Real-time Control Tasks Considering Performance Index Function)

  • 곽성우;정용주
    • 전기학회논문지
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    • 제57권5호
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    • pp.875-880
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    • 2008
  • In this paper, a novel method to determine the optimal checkpoint interval for real-time control task is proposed considering its performance degradation according to tasks's execution time. The control task in this paper has a specific sampling period shorter than its deadline. Control performance is degraded as the control task execution time is prolonged across the sampling period and eventually zero when reached to the deadline. A new performance index is defined to represent the performance variation due to the extension of task execution time accompanying rollback fault recovery. The procedure to find the optimal checkpoint interval is addressed and several simulation examples are presented.

Optimal pricing and spare parts manufacturing strategy for EOL (end-of life) services

  • Kim, Bo-Won;Ko, Deok-Soo
    • 한국경영과학회:학술대회논문집
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    • 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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    • pp.938-946
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    • 2005
  • We study the firm's strategy to price its products and plan the spare parts manufacturing so as to maximize its profit and at the same time to fulfill its commitment to providing the customers with the key parts continuously over the relevant decision time horizon, i.e., the production plus warrantee period. To examine the research question, we developed and solved a two-stage optimal control theory model. Our analysis suggests that if the cost to produce the spare part during the warrantee period is more expensive than that during the production period, the firm should increase its sales price gradually throughout the production period to control its sales. In addition, during the production period it is optimal for the firm to produce the spare parts more than needed so that the overproduced spare parts can be used to partially meet the demand during the warrantee period. We conducted numerical analysis to investigate the sensitivity dynamics among key variables and parameters such as inventory holding cost, unit spare part production costs, part failure rate, and parameters in the demand function.

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동적제빙형 빙축열시스템에 대한 최적운전계획 (Optimal Scheduling for Dynamic Ice Storage System with Perfectly Predicted Cooling Loads)

  • 이경호;이상렬;최병윤;권성철
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.286-291
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    • 2001
  • This paper describes an optimal scheduling for ice slurry systems for energy cost saving. The optimization technique applied in the study is the dynamic programming method, for which the state variable is the storage in the ice storage tank and the control variable is the state of chiller's on-off switching. Though the costs during charge period is included in optimization by taking the average cost of ice per hour for slurry making, the time horizon for the simulation is limited building cooling period because accurate charge rate from the ice maker into the ice storage tank cannot be estimated during the charge period. In the operating simulation after optimizing procedure, energy consumption and operating cost for the optimal control are calculated and compared with them for a conventional control with one case of cooling load profile.

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OPTIMAL PERIOD SELECTION TO MINIMIZE THE END-TO-END RESPONSE TIME

  • SHIN M.;LEE W.;SUNWOO M.
    • International Journal of Automotive Technology
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    • 제6권1호
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    • pp.71-77
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    • 2005
  • This paper presents a systematic approach which determines the optimal period to minimize performance measure subject to the schedulability constraints of a real-time control system by formulating the scheduling problem as an optimal problem. The performance measure is derived from the summation of end-to-end response times of processed I/Os scheduled by the static cyclic method. The schedulability constraint is specified in terms of allowable resource utilization. At first, a uniprocessor case is considered and then it is extended to a distributed system connected through a communication link, local-inter network, UN. This approach is applied to the design of an automotive body control system in order to validate the feasibility through a real example. By using the approach, a set of optimal periods can easily be obtained without complex and advanced methods such as branch and bound (B&B) or simulated annealing.

반응도 제한법에 의한 KMRR의 시간 최적 출력 제어 (Time-Optimal Power Control for KMRR Using Reactivity Constraint Method)

  • Lee, Byung-Ill;Kim, Myung-Hyun
    • Nuclear Engineering and Technology
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    • 제23권1호
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    • pp.30-40
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    • 1991
  • 한국형 다목적 연구로(KMRR)의 출력 자동제어를 위하여 새로운 제어이론으로 등장한 반응도 제한법을 시간 최적제어에 적용하여 보았다. 반응도 제한법은 원자로내의 반응도가 제어봉의 움직임으로 상쇄될 수 있는 반응도보다 항상 작도록 제한하여 준다. 이 방법을 시간 최적제어에 이용하기 위해 서 는 일정 한 원자로주기를 유지하도록 하는 반응도 값을 Dynamic Period Equation으로 얻어야 한다. 따라서 2점 동특성 방정식에 의한 Dynamic Period Equation이 새로 유도되었다. 이 제어법을 시험하기 위해 수학적 모델로 구성된 제어모델을 원자로 모의 전산코드인 KMRSIM에 적용하여 보았다. 반응도제한법도 출력의 시간 최적제어에서 신뢰할만한 결과를 보여줌을 알았다.

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ANALYSIS OF THE MITIGATION STRATEGIES FOR MARRIAGE DIVORCE: FROM MATHEMATICAL MODELING PERSPECTIVE

  • TESSEMA, HAILEYESUS;MENGISTU, YEHUALASHET;KASSA, ENDESHAW
    • Journal of applied mathematics & informatics
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    • 제40권5_6호
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    • pp.857-871
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    • 2022
  • In this work, we formulated a mathematical model for divorce in marriage and extended in to an optimal control model. Firstly, we qualitatively established the model positivity and boundedness. Also we saw sensitivity analysis of the model and identified the positive and negative indices parameters. An optimal control model were developed by incorporating three time dependent control strategies (couple relationship education, reducing getting married too young & consulting separators to renew their marriage) on the deterministic model. The Pontryagin's maximum principle were used for the derivation of necessary conditions of the optimal control problem. Finally, with Newton's forward and backward sweep method numerical simulation were performed on optimality system by considering four integrated strategies. So that we reached to a result that using all three strategies simultaneously (the strategy D) is an optimal control in order to effectively control marriage divorce over a specified period of time. From this we conclude that, policymakers and stakeholders should use the indicated control strategy at a time in order to fight against Divorce in a population.

분산 제어 시스템에서의 태스크와 메시지 기반 스케줄링을 이용한 최적 주기와 우선순위 할당 (Optimal Period and Priority Assignment Using Task & Message-Based Scheduling in Distributed Control Systems)

  • 김형육;이철민;박홍성
    • 제어로봇시스템학회논문지
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    • 제8권6호
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    • pp.506-513
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    • 2002
  • Distributed control systems(DCS) using fieldbus such as CAN have been applied to process systems but it is very difficult to design the DCS while guaranteeing the given end-to-end constraints such as precedence constraints, time constraints, and periods and priorities of tasks and messages. This paper presents a scheduling method to guarantee the given end-to-end constraints. The presented scheduling method is the integrated one considering both tasks executed in each node and messages transmitted via the network and is designed to be applied to a general DCS that has multiple loops with several types of constraints, where each loop consists of sensor nodes with multiple sensors, actuator nodes with multiple actuators and controller nodes with multiple tasks. An assignment method of the optimal period of each loop and a heuristic assignment rule of each message's priority are proposed and the integrated scheduling method is developed based on them.

인지 무선 네트워크에서 시스템 비용함수를 이용한 적응적 센싱주기 (Sensing Period Adaptation using the Cost Function in the Cognitive Radio Networks)

  • 고상;박형근
    • 전기학회논문지
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    • 제61권2호
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    • pp.321-323
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    • 2012
  • Cognitive radio has been recently proposed to dynamically access unused-spectrum. Since the spectrum availability for opportunistic access is determined by spectrum sensing, sensing is identified as one of the most crucial issues of cognitive radio networks. The PHY-layer sensing, as a part of spectrum sensing in cognitive radio, concerns the sensing mechanism to determine channel to be sensed and to access. One of the important issues in the PHY-layer sensing control is to find an available sensing period and trade-off between spectrum sensing and data transmission. In this paper, we show the relationship between spectrum sensing and data transmission according to the sensing period. We analyze and propose the new scheme to evaluate optimal sensing period.