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Aggregation of location estimates from multiple services for provisioning of location information enhances the accuracy and robustness of the final location information. Recent Internet of Things (IoT)-based localization service architectures therefore envision a "manager" for selecting and invoking provisioning services and, in the later step, aggregating the received information and providing...
This paper focuses on optimizing the robustness of a timetable with multiple train lines of different frequencies, where overtakings are also taken into account. An optimization model is considered of a cyclic railway timetable problem where dwell times and running times are variable and overtaking is allowed for relevant stations and each line. Based on the Periodic Event Scheduling Problem, train...
The Conic Sector Theorem is a versatile input-output stability result that can be used to ensure closed-loop, input-output stability where better-known results, such as the Passivity and Small Gain Theorems, cannot. Moreover, conic sectors can be used to characterize a variety of input-output properties, such as gain, phase, and minimum gain. This paper proposes a linear-matrix-inequality-based approach...
This paper focuses on the robustness problem for a specific class of dynamical systems, namely the piecewise affine (PWA) systems, defined over a bounded region of the state-space χ. We will be interested in PWA systems emerging from linear dynamical systems controlled via feedback channels in the presence of varying transmission delays by a PWA controller defined over a polyhedral partition of the...
The efficient and carrier-grade operation of virtualised network infrastructures (Infrastructure as a Service, IaaS) within Cloud Systems requires powerful methods for dynamic resource provisioning, virtual network functions (VNF) placement and interconnection. In the scientific literature, already several contributions related to the virtual network embedding (VNE) problem can be found, see [1] and...
Computer network plays vital role in our day to day life's critical issues such as hospitals, fire brigade, military. The errors or failures in such computer network create significant loss. These failures or errors should be taken into account while designing a computer network. Designing and improving computer network performance includes complex tasks, which takes more time and money. The network...
In this paper, we present a controversial control concept, Sign Inverting Control (SIC), for systems with multiple time delays. The main motivation for SIC is to provide added robustness capability of a system against delay variations. A nominal control law is formulated for non-delayed case and SIC suggests the sign inversion in these nominal control gains, which is a paradoxical proposition, in...
A method for online fault detection of networked control system considering the network-induced delay was studied in this paper. First of all, a fault detection model was established for the impact of the unknown network-induced delay. Based on the model, the fault detection filter was constructed, and then the fault detection is converted to a optimization problem. The numerical simulation shows...
Pre-timed signalized junctions are prevalent in real world as they are inexpensive and easy to implement. Traffic flow in these junctions exhibit large variations even for the same time interval of the day. Hence, robust signal timings, those are less sensitive to uncertain traffic flow are desired. The existing signal control models for pre-timed junctions use min-max approach for robust signal control...
This paper addresses the combination of a low delay subband ADPCM-based audio codec with adaptive pre- and post-filtering for psychoacoustic noise shaping. We present how our basic scheme for error robust subband coding can be combined with two cascades of band shelving filters. The gain parameters of these filters are adapted by an algorithm that is based on power estimates which are obtained from...
Railway traffic is often perturbed by unexpected events and appropriate train routing and scheduling shall be applied to minimize delay propagation. A number algorithms for this routing and scheduling problem have been proposed in the literature and they have been tested in different traffic situations. Nonetheless, their performance are almost always studied considering perfect knowledge of future...
This paper presents a Via programmable read only memory (Via-ROM) for Vmin and macro-yield enhancement through robust ROM designs based on 45nm process. The main stability issues in ROM are 1) lower on-cell (NMOS) current, 2) higher keeper (PMOS) current, and 3) higher bit-line (BL) parasitic value. To improve the Vmin and macro-yield, the robust ROM design schemes are implemented as follows. 1) ROM...
The problem of constructing robust (with respect to the uncontrolled disturbances) diagnostic tools for nonlinear time-invariant discrete systems with a single delay is considered. The solution is based on the logic-dynamic approach, which allows one to solve the problem of diagnosis in nonlinear systems by linear methods without sacrificing the solution quality. The robustness of the diagnostic procedure...
This paper studies the H2/H∞ approach to control the Internet traffic. We are interested in using the H2 formulation to improve transient performances in addition to maintaining the robust performance offered by the formerly used H∞ formulation. In this controller, the closed-loop dynamics are monitored and controlled by the sensitivity functions along with their associated weight functions. The LMI...
This paper deals with the design of robust digital controllers by the combined pole placement / sensitivity function shaping method. It shows that the design problem can be formulated and solved as a convex optimization problem. Specifications like dominant closed-loop poles or integration controller action may be introduced just as well as other fixed parts for the controller. The method is illustrated...
Decentralized rate-based flow controller design in multi-bottleneck networks is considered. An H∞ problem is formulated to find decentralized controllers which are robust to time-varying uncertain multiple time-delays in different channels. A suboptimal solution to this problem is found and the implementation of the decentralized controllers at different bottleneck nodes is presented. Besides robustness,...
Legged robots enjoy kilohertz control rates but are still making incremental gains towards becoming as nimble as animals. In contrast, bipedal animals are amazingly robust runners despite lagged state feedback from protracted neuromechanical delays. Based on evidence from biological experiments, we posit that much of disturbance rejection can be offloaded from feedback control and encoded into feed-forward...
This paper considers power and rate control for wireless networks with time-varying delays, uncertainties and input constraints. A robust delay-dependent model predictive power and rate control method is presented, and the state feedback control law is obtained by solving an optimization problem. Simulation results verify the effectiveness of the proposed method.
The paper addresses the problem of remote plant control in networked environment with the use of linear-quadratic (LQ) optimal controller. Since information exchange in networked control systems is essentially a discrete-time process, the controller design is conducted directly in discrete time domain. It is formally shown that the optimization problem for systems involving delay may be reduced to...
In this work, a new approach to design constrained distributed MPC is proposed for linear parameter varying (LPV) systems subject to saturating actuator and state delay. Polytopic type uncertainty and only one state delay are considered in this paper. The algorithm requires decomposing the whole system into M subsystems and solving M linear matrix inequality (LMI) optimization problems for each subsystem...
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