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Timing imperfections in Cyber-Physical Systems (CPS) components affect their performance and reliability. This investigation presents a methodology to design and verify CPS using multi-objective evolutionary optimization, model checking and supporting software tools. The time-varying delays in CPS are modeled as constant delays plus jitter. It is shown that the CPS design problem is a trade-off between...
Studying cyber-physical system (CPS) for a given network protocol and processor schedules is a challenging task. This investigation illustrates the role of TrueTime a MATLAB package for simulating CPS encapsulating information on processor schedules, and network protocols. Properties of CPS such as temporal behaviors, performance and stability can be studied using the TrueTime tool. Furthermore, these...
Asset Management Systems (AMS) are pivotal to build reliable and safe smart grids. An important function of AMS is the monitoring and diagnosis of the power transformers. Various tests are performed on power transformers to detect incipient faults. Among the available methods, Dissolved Gas Analysis (DGA) has been widely used and shown promise. However, interpreting the results of the DGA is challenging...
Time-varying delays affect the performance and reliability of networked automation systems (NAS). Recent trend to use wired and wireless networks within NAS induces network delays that vary depending on many factors such as loading, sharing, length of the channel, protocol, and so on. As these factors are inherently time-varying, developing analytical models capturing the effect of all these parameters...
Cyber-Physical Systems (CPS) have enabled plethora of applications and are seen as future solutions to build large-scale infrastructure. Controller meeting design requirements and performance objectives are required for building CPS. This is non-trivial due to the interplay and temporal constraints among the physical, computing, communication, and control entities within CPS. This paper presents design...
Sophisticated controllers using building models and effects of disturbances are required for saving energy in buildings. Occupancy and climate are the disturbances acting on the building thermal model. This investigation presents a procedure for constructing building thermal model using experiments, simple sensor and least-absolute shrinkage and selection operator (LASSO). The thermal model so obtained...
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