By employing fault tolerance, embedded systems can withstand both intentional and unintentional faults. Many fault tolerance mechanisms are invoked only after a fault has been detected by whatever fault-detection mechanism is used; hence, the process of fault detection must itself be dependable if the system is expected to be fault-tolerant. Many faults are detectable only indirectly as a result of performance disorders that manifest as anomalies in monitored system or sensor data. Anomaly detection, therefore, is often the primary means of providing early indications of faults. As with any other kind of detector, one seeks full coverage of the detection space with the anomaly detector being used. Even if coverage of a particular anomaly detector falls short of 100%, detectors can be composed to effect broader coverage, once their respective sweet spots and blind regions are known. This paper provides a framework and a fault-injection methodology for mapping an anomaly detector's effective operating space and shows that two detectors, each designed to detect the same phenomenon, may not perform similarly, even when the event to be detected is unequivocally anomalous and should be detected by either detector. Both synthetic and real-world data are used.

Anomaly detection in embedded systems

A group of crosslinked cyclic siloxane (Si-O) and silazane (Si-N) polymers are synthesized via solvent-free initiated chemical vapor deposition (iCVD). Notably, this is the first report of cyclic polysilazanes synthesized via the gas-phase iCVD method. The deposited nanoscale thin films are thermally stable and chemically inert. By iCVD, they can uniformly and conformally cover nonplanar surfaces having complex geometry. Although polysiloxanes are traditionally utilized as dielectric materials and insulators, our research shows these cyclic organosilicon polymers can conduct lithium ions (Li(+) ) at room temperature. The conformal coating and the room temperature ionic conductivity make these cyclic organosilicon polymers attractive for use as thin-film electrolytes in solid-state batteries. Also, their synthesis process and properties have been systemically studied and discussed.

iCVD Cyclic Polysiloxane and Polysilazane as Nanoscale Thin-Film Electrolyte: Synthesis and Properties.

Computer vision has historically been taught as a graduate subject since few examples of the discipline were being practiced in mainstream engineering. In recent years, the incorporation of multimedia into embedded devices has drawn some vision topics into mainstream attention. Examples of consumer products include digital video recorders, cellular phones, and automobile collision-avoidance systems. This paper describes the development of an undergraduate course that incorporates some vision topics into the larger context of embedded computing. Traditional topics, such as processor types, dynamic power management, and real-time scheduling, are taught alongside relevant vision topics, such as codecs, concurrent interfaces, and multimedia signal acquisition, storage, and rendering. In lab work, the students program hardware to operate as a digital video camera. While the primary goal for the course is to teach embedded computing, a secondary goal for the course is to entice students into graduate study in computer vision. However, a major developmental point was to justify the vision content in the context of how it serves the needs of students not opting for graduate study, as well as how the course would impact students working in other related graduate research areas.

Computer vision in undergraduate education: modern embedded computing

This paper describes the experience of customizing RT-Linux for its use in embedded real-time control. It describes the system configuration and the issues involved in minimizing Linux for a small embedded system. It introduces the concept of file system profiles to deal with this minimization. Another interesting feature is how to achieve real-time features through the use of RT-Linux Finally, the paper describes the design of a CAN network driver for providing real-time transmission on a RT-Linux system.

Developing CAN based networks on RT-Linux

A minimal RT-Linux embedded system for control applications

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Citations

Anomaly detection in embedded systems

iCVD Cyclic Polysiloxane and Polysilazane as Nanoscale Thin-Film Electrolyte: Synthesis and Properties.

Computer vision in undergraduate education: modern embedded computing

Developing CAN based networks on RT-Linux

A minimal RT-Linux embedded system for control applications

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