Control reconfiguration

About: Control reconfiguration is a research topic. Over the lifetime, 22423 publications have been published within this topic receiving 334217 citations.

Optimizing modular product design for reconfigurable manufacturing

Abstract: The problem of optimizing modular products in a reconfigurable manufacturing system is addressed. The problem is first posed as a generalized subset selection problem where the best subsets of module instances of unknown sizes are determined by minimizing an objective function that represents a trade-off between “the quality loss due to modularization” and the cost of reconfiguration while satisfying the problem constraints. The problem is then formulated and solved as an integer nonlinear programming problem with binary variables. The proposed method is applied to the production of a modular drive system composed of a DC motor and a ball screw. The study is a first attempt toward developing a systematic methodology for manufacturing modular products in a reconfigurable manufacturing system.

Sequential circuit fault simulation using logic emulation

Abstract: A fast fault simulation approach based on ordinary logic emulation is proposed. The circuit configured into our system that emulates the faulty circuit's behaviour is synthesized from the good circuit and the given fault list in a novel way. Fault injection is made easy by shifting the content of a fault injection scan chain or by selecting the output of a parallel fault injection selector, with which we get rid of the time-consuming bit-stream regeneration process. Experimental results for ISCAS-89 benchmark circuits show that our serial fault emulator is about 20 times faster than HOPE. The speedup grows with the circuit size by our analysis. Two hybrid fault emulation approaches are also proposed. The first reduces the number of faults actually emulated by screening off faults not activated or with short propagation distances before emulation, and by collapsing nonstem faults into their equivalent stem faults. The second reduces the hardware requirement of the fault emulator by incorporating an ordinary fault simulator.

Reactive process networks

Abstract: Data flow process networks are a good model of computation for streaming multimedia applications incorporating audio, video and/or graphics streams. Process networks are concurrent processes communicating streams of data through FIFO channels. They can be executed efficiently and determinately on multiprocessor platforms. However, such stream processing applications are becoming more dynamic, often requiring run-time reconfigurations. Moreover, stream processing is not always an application on its own, but may be a component of a larger application. This application, e.g. a game application, may be control oriented and event driven; events may interact with the streaming component and (re)configure it.In order to capture the interaction between reactive and streaming components as well as reconfiguration in dynamic stream processing, we introduce in this paper a formal, operational and compositional semantics of so-called reactive process networks. This operational semantics can serve as the basis for programming models that allow the programming of streaming components interacting with reactive system components and their reconfigurations. It also supports the construction of analysis and synthesis tools for dynamic streaming multimedia applications. It allows the integration of reactive behaviour in process networks as general as Kahn process networks, but it is also suitable for more restricted and efficient classes of process networks.