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In statistical process control, Gamma control charts are often designed for time-between-events (TBEs) monitoring. For Gamma distribution, the traditional equal-tail probability limits lead to the problem that some out-of-control events may occur in higher probability than in-control events. To overcome this problem, Gamma control limits with known parameters are proposed based on the narrowest confidence...
In the raymond mill grinding processes, high-accuracy control for the current of raymond mill is the key point to enhance the product quality and production efficiency. However, strong external disturbances, such as variations of ore hardness and ore size, always exist. It is not easy to make the current of raymond mill constant. Several control strategies have been proposed to control the grinding...
In this paper, we propose an event-driven output feedback control strategy for a class of nonlinear systems subject to disturbances. Different from the time-driven control, the event-driven control can be regarded as a more reactive approach where the control actions are taken only when an event is triggered, thus the event-driven control has a better balance between the control performance and other...
There are increasing new needs for advanced process control (APC) from chemical mechanical polishing (CMP) process along with the technology nodes advancing to 28nm and below. Besides traditional applications for wafer to wafer and batch to batch thickness variation reduction, and feed-forward based on incoming thickness/depth, the other new needs include within wafer uniformity control based on consumable...
A disturbance observer enhanced internal model control approach is addressed in this paper to control a typical industrial process system. By implementing the proposed method, both simulation and experimental studies have been carried out to control a practical level tank system which may subject to strong disturbances. The results show that the proposed method transparently improves the disturbance...
Load balancing is an important problem for parallel applications. Recently, many super computers are built on multi-core processors which are usually sharing the last level cache. On one hand different accesses from different cores conflict each other, on the other hand different cores have different work loads resulting in load unbalancing. In this paper, we present a novel technique for balancing...
The proliferation of chip multiprocessors (CMPs) has led to the integration of large on-chip caches. For scalability reasons, a large on-chip cache is often divided into smaller banks that are interconnected through packet-based network-on-chip (NoC). With increasing number of cores and cache banks integrated on a single die, the on-chip network introduces significant communication latency and power...
This paper is intended to serve as an introduction to the conceptual design of control system for a compact free electron laser (FEL) terahertz radiation source (FTRS). The general architecture of the control system is presented. The hardware components, software design, communications and subsystems are described in the paper. We also discuss a novel method of using Matlab Simulink\stateflow to simulate...
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