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This paper discusses an optimal maintenance policy for a parallel system with periodic inspection. The system is composed of several units which have an independent and identical distribution. When the number of failed unit exceeds a threshold level, the system incurs a loss cost per unit of time from a failure to the next inspection. When the next inspection finds the failure, the system is overhauled,...
The advances of high throughput research in the biomedical domain have resulted in an onslaught of data being generated at an exponential rate. As a result, researchers face challenges in navigating through overwhelming amounts of information in order to derive relevant scientific insights. Ontologies address these issues by providing explicit description of biomedical entities and a platform for...
Cable-driven parallel manipulators (CDPMs) are a special class of parallel manipulators that are driven by cables instead of rigid links. Due to the unilateral property of the cables, all the driving cables in a fully-constrained CDPM must always maintain positive tension. As a result, tension analysis is the most essential issue for these CDPMs. By drawing upon the mathematical theory from convex...
This paper describes an efficient technique to analyze the transmission and the reflection of finite size frequency selective surfaces (FSS) array. The transmission and reflection coefficients are calculated using the method of moment by comparison with the metallic plate with the same size. Numerical examples are given to demonstrate the validity and efficiency of the proposed method.
Lots of research have been done within the mental health domain, but exact causes of mental illness are still unknown. Concerningly, the number of people being affected by mental conditions is rapidly increasing and it has been predicted that depression would be the world's leading cause of disability by 2020. Most mental health information is found in electronic form. Application of the cutting-edge...
In this paper we propose a non-recursive method for solving the general discrete-time algebraic Riccati equation related to the H∞, control problem (H∞-DARE). We have achieved this by casting the problem of solving a given H∞-DARE to the problem of solving an auxiliary continuous-time algebraic Riccati equation associated with the H∞ control problem (H∞-CARE) for which the well known non-recursive...
This part focuses on the design of controllers for the recovery of target loop transfer function or sensitivity and complimentary sensitivity functions for general nonminimum phase discrete time systems. For general systems, loop transfer recovery is not completely feasible although there exists considerable amount of freedom to shape the inevitable recovery error. Here the necessary design constraints...
This paper presents a simple and non-iterative procedure for the computation of the exact value of the infimum in the singular H∞ optimization problem and is a continuation of our earlier work [1]-[3]. Our problem formulation in general and we do not place any restrictions on the finite and infinite zero structures of the system, and the direct feedthrough terms between the control input and the controlled...
In this paper the most general H2 control problem is considered. We derive necessary and sufficient conditions when the infimum is attained by state feedback. We do the same for the measurement feedback case where we derive necessary and sufficient conditions when the infimum is attained by proper dynamic compensators. We also investigate reduced order compensators if some states are observable without...
A complete analysis of loop transfer recovery (LTR) for general nonstrictly proper, not necessarily minimum phase discrete time systems is presented. Three different observer based controllers, namely, 'prediction estimator', and full or reduced order type 'current estimator' based controllers, are used. The analysis corresponding to all these three controllers is unified into a single mathematical...
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