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State and input delays are ubiquitous in networked visual servo control systems due to image acquisition, transmission, and processing latencies. In addition, the delays can be time-varying due to network uncertainties and the complexity of the images to be processed. This paper revisits the popular 2.5D visual servo control problem but considers the presence of state and input delays. Specifically,...
This paper proposes an active queue management (AQM) controller based on Backstepping Sliding Mode control for a class of nonlinear TCP network congestion systems in the presence of uncertain parameters and unknown external disturbances. At the same time, based on the idea of the Minimax method in game theory, a novel output feedback controller is specially designed. Considering the situation that...
With the ever increasing process variability in recent technology nodes, path delay fault testing of digital integrated circuits has become a major challenge. A randomly chosen long path often has no robust test and many of the existing non-robust tests are likely invalidated by process variations. To generate path delay fault tests that are more tolerant towards process variations, the delay test...
In this paper, a model-based event-triggered control law is adopted to reduce communication traffic in networked control systems. In this model-based control system, a nominal model of system plant is used to estimate the system state between two sampling instants. By simultaneously considering bounded system noise and bounded network delay, a mixed event-triggering mechanism is proposed to stabilize...
We ask if it is possible to positively influence social behavior with no risk of unintentionally incentivizing pathological behavior. In network routing problems, if network traffic is composed of many individual agents (such as drivers in a city's road network), it is known that self-interested behavior among the agents can lead to suboptimal network congestion. To mitigate this, a system planner...
The Federal Aviation Administration (FAA) rations capacity to reduce en route delay, especially those caused by bad weather. This is accomplished via Collaborative Trajectory Options Program (CTOP) which has been recently developed to provide a mechanism for flight operators to communicate their route preferences for each flight via a Trajectory Option Set (TOS), as well as a mechanism for the FAA...
In this work, we investigated the sliding mode control (SMC) for uncertain systems with both state and input varying delays. In most existing SMC, a common input and delayed input matrix are considered to apply the conventional method, which is very restrictive assumption. Therefore, we proposed a new sliding surface which takes account of the system state and the control input in order to remove...
Both traditional wireless sensor networks and novel crowdsensing techniques generate tremendous real- time data, which provides great opportunities for real- time and long-term analytics. However, how to integrate the heterogeneous data sources and create data analytics toolboxes that can be connected together to solve various problems in urban environment remains open problems. As a PhD student,...
A partial differential equation (PDE) based controller is developed for a nonlinear system with bounded external disturbances and unknown time-varying input delay. Motivated by predictor-based delay compensation methods, a linear transformation is used to map the time-varying input to a control input which varies both in time and space. This technique separates the delay magnitude and derivative terms,...
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...
In this paper, we study the cooperative global robust output regulation problem for a class of nonlinear multi-agent systems. Similar problems have been studied by some existing results. However, to the best of our knowledge, the communication delay has never been considered in cooperative output regulation problem for nonlinear multi-agent systems. By integrating the distributed feedforward approach...
Scheduling in queueing networks concerns a scenario where a scheduler, using system backlog information, decides to which processor to route arriving jobs to achieve various objectives. However, in such scenarios, a significant yet inevitable challenge facing the scheduler in practice is its delayed access to such system configuration information. In this paper, we incorporate this crucial delay element...
In this paper, the distributed consensus control problem for linear multi-agent systems, subject to external disturbance and time-varying input delays, is addressed under the robust ℋ∞ and dynamic integral quadratic constraint (IQC) analysis framework. A novel distributed protocol is proposed using both relative plant state and IQC dynamics state information. It is shown that under the proposed design...
We discuss the notion of systemic risk in noisy consensus systems with delay as a measure of robustness and resilience. We propose a risk measure to characterize systemic events of the dynamic network, based on quantile functions theory. We provide explicit calculations or estimates for our consensus dynamic both in transient and steady-state dynamics. Our analysis highlights the dependence of risk...
This paper present the design of a PID controller based on state feedback. The parameters of our PID are computed using linear matrix inequality (LMI) technique and applied to active queue management (AQM) at router to avoid congestion. The results has been compared with other AQMs used in network like random early detection (RED) and random exponential markage (REM) in order to demonstrate the advantage...
Hold-time faults are gaining attention in modern technologies because of process variation, power supply noise, and etc. A path-based hold-time fault model is proposed to cover short paths to and from every flip-flop. In addition, the number of faults is linear to the number of flip-flops in the circuit. Two-timeframe circuit models are proposed for ATPG and fault simulation. We show that traditional...
Centralized and decentralized robust servomechanism problems for time-delay systems are considered. Sufficient and necessary conditions for the solvability of these problems are presented. The conditions for the two problems are compared and it is shown that the conditions for the centralized problem are in fact a special case of the conditions for the decentralized problem. The structure of the controllers...
Article is devoted to the questions of improving work quality of regulators with proportional-integral-differential and proportional-integral laws of controlling technological processes. The quality classical law of regulation can be improved using non-linear control loop for the difference between the set value and the actual value. At a preliminary investigation phase two non-linear functions (polygonal...
This paper presents a high-performance, low-cost, and double node upset (DNU) tolerant latch design. The latch mainly constructs from a 3-input Muller C-element at the output stage and a single node upset resilient cell for keeping data, and the cell mainly consists of triple mutual feedback 2-input Muller C-elements, thus the latch is DNU tolerant. Using fewer CMOS transistors, clock gating technique,...
PoC is a group communication service using VoIP technology based on 3G cellular network packet domain carrier. ROHC can complete the header compression in PS domain of 3G network, which can improve the efficiency of wireless transmission. This paper analyzes the working principle and the operation modes of ROHC, designs the processing of the compressor and decompressor. Simultaneity an improved algorithm...
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