Design of a telescope control system using an ARM microcontroller with embedded RTOS

An Intelligent Traffic Signal Control System Based on ARM Cortex-M3

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.1378 ◽

2014 ◽

Vol 602-605 ◽

pp. 1378-1382 ◽

Cited By ~ 1

Author(s):

Shan Ying Cheng ◽

Xue Mei Zhou ◽

Qin Jiang

Keyword(s):

Control System ◽

Traffic Signal ◽

Signal Control ◽

Traffic Signal Control ◽

Traffic Jam ◽

Task Control ◽

Embedded Rtos ◽

Stable Performance ◽

Population Genetic Algorithm ◽

Result Analysis

In order to alleviate traffic jam, an intelligent traffic signal control system base on ARM Cortex-M3 is implemented. In the system, STM32F207 is processor. Embedded RTOS CoOS is transplanted to achieve multi-task control of traffic signal in software design. A new multi-population genetic algorithm is developed to optimize green ratio. The result analysis shows that the system has stable performance and it makes the optimization of green ratio convenient and swift.

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A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075798 ◽

1983 ◽

Vol 41 ◽

pp. 408-409

Author(s):

W. J. Abramson ◽

H. W. Estry ◽

L. F. Allard

Keyword(s):

Electron Beam ◽

Control System ◽

Thermal Shock ◽

Appropriate Care ◽

Electron Guns ◽

Tungsten Filaments ◽

Order Of Magnitude ◽

Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

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