Channel-Aware Scheduling for Multiple Control Systems with Packet-Based Control over Collision Channels

2019 ◽  
Author(s):  
Pengfei Li ◽  
Yu Kang ◽  
Yun-Bo Zhao ◽  
Xiaokang Pan
Keyword(s):  
Control Systems ◽  
Multiple Control ◽  
Channel Aware Scheduling

scholarly journals Users’ experiences of lighting controls: A case-study

2017 ◽  
Vol 50 (7) ◽  
pp. 1091-1106 ◽  
Author(s):  
KL van Someren ◽  
C Philip Beaman ◽  
L Shao
Keyword(s):  
Control Systems ◽  
Structured Interviews ◽  
Multiple Control ◽  
Small Power ◽  
Lighting Control ◽  
University Buildings ◽  
Control And Management ◽  
The University ◽  
University Setting

The aim of this paper is to elucidate how occupants perceive their lit environments in a university setting and how they interact with lighting controls using qualitative methods. Semi-structured interviews were carried out with academic teaching and research staff. Thematic analysis identified four main themes: control and choice, connection with the outdoors, concentration and comfort. Participants were largely able to control and adapt their lighting using small power lighting in office spaces and they perceived this as beneficial to comfort and concentration. Participants expressed frustration with the light switches in classrooms, and a lack of consistency in lighting controls across the university buildings was particularly notable. Installers should consider how piecemeal upgrades on large estates affect the perception of buildings where occupiers face multiple control systems. The management of the lighting in classroom spaces including the type and location of blinds, lack of regular window cleaning in some buildings and difficulty in minimising light on projection screens in upgraded classrooms were cited as areas for improvement. Wider implications for lighting control and management highlighted by this study include most notably that a lack of end users consultation has serious consequences on their perception of lighting upgrades and their willingness to employ ‘workarounds.’

scholarly journals Transmission Scheduling Schemes of Industrial Wireless Sensors for Heterogeneous Multiple Control Systems

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4284 ◽  
Author(s):  
Bongsang Park ◽  
Junghyo Nah ◽  
Jang-Young Choi ◽  
Ick-Jae Yoon ◽  
Pangun Park
Keyword(s):  
Constrained Optimization ◽  
Control Systems ◽  
Optimization Problem ◽  
Random Access ◽  
Transmission Scheduling ◽  
Constrained Optimization Problem ◽  
Multiple Control ◽  
Scheduling Scheme ◽  
Control Stability ◽  
The Stability

The transmission scheduling scheme of wireless networks for industrial control systems is a crucial design component since it directly affects the stability of networked control systems. In this paper, we propose a novel transmission scheduling framework to guarantee the stability of heterogeneous multiple control systems over unreliable wireless channels. Based on the explicit control stability conditions, a constrained optimization problem is proposed to maximize the minimum slack of the stability constraint for the heterogeneous control systems. We propose three transmission scheduling schemes, namely centralized stationary random access, distributed random access, and Lyapunov-based scheduling scheme, to solve the constrained optimization problem with a low computation cost. The three proposed transmission scheduling schemes were evaluated on heterogeneous multiple control systems with different link conditions. One interesting finding is that the proposed centralized Lyapunov-based approach provides almost ideal performance in the context of control stability. Furthermore, the distributed random access is still useful for the small number of links since it also reduces the operational overhead without significantly sacrificing the control performance.

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