Optimal Dynamic Quantizers for Feedback Control With Discrete-Level Actuators: Unified Solution and Experimental Evaluation

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Shun-ichi Azuma ◽  
Yuki Minami ◽  
Toshiharu Sugie
Keyword(s):  
Feedback Control ◽  
Closed Form ◽  
Experimental Evaluation ◽  
Current Data ◽  
General Linear ◽  
Positioning System ◽  
Discrete Level ◽  
The Past ◽  
Optimal Dynamic ◽  
Dynamic Quantizer

This paper proposes to use optimal dynamic quantizers for feedback control in mechatronics systems when the actuator signals are constrained to discrete-valued signals. Here, the dynamic quantizer is a device that transforms the continuous-valued signals into the discrete-valued ones depending on the past signal data, as well as the current data. First, a closed form optimal quantizer is presented in a general linear fraction transformation representation setting. The optimal quantizer minimizes the deviation of the output produced by the quantized signals from the corresponding output yielded by the continuous-valued signals before quantization. Then, its experimental evaluation is performed by using a crane positioning system with a discrete-valued input to demonstrate the effectiveness of the proposed quantizers.

scholarly journals Optimum range of angle tracking radars: a theoretical computing

2019 ◽  
Vol 9 (3) ◽  
pp. 1765 ◽  
Author(s):  
Sadegh Samadi ◽  
Mohammad Reza Khosravi ◽  
Jafar A. Alzubi ◽  
Omar A. Alzubi ◽  
Varun G. Menon
Keyword(s):  
Closed Form ◽  
Optimization Problem ◽  
Tracking System ◽  
Total Error ◽  
Optimal Range ◽  
The Past ◽  
Simple Simulation ◽  
Simulation Based ◽  
Angle Tracking ◽  
Theoretical Computing

In this paper, we determine an optimal range for angle tracking radars (ATRs) based on evaluating the standard deviation of all kinds of errors in a tracking system. In the past, this optimal range has often been computed by the simulation of the total error components; however, we are going to introduce a closed form for this computation which allows us to obtain the optimal range directly. Thus, for this purpose, we firstly solve an optimization problem to achieve the closed form of the optimal range (Ropt.) and then, we compute it by doing a simple simulation. The results show that both theoretical and simulation-based computations are similar to each other.

scholarly journals Neurologic Safety Monitoring of COVID-19 Vaccines: Lessons From the Past to Inform the Present

Neurology ◽  
2021 ◽  
pp. 10.1212/WNL.0000000000012703
Author(s):  
Kiran Teresa Thakur ◽  
Samantha Epstein ◽  
Amanda Bilski ◽  
Alanna Balbi ◽  
Amelia K Boehme ◽  
...  
Keyword(s):  
Adverse Events ◽  
Adenovirus Vector ◽  
Safety Monitoring ◽  
Current Data ◽  
Significant Morbidity ◽  
Medical Interventions ◽  
The Past ◽  
Safety Risks ◽  
Potential Safety ◽  
Neurological Conditions

The spread of the SARS-CoV-2 virus has triggered a global effort to rapidly develop and deploy effective and safe COVID-19 vaccination(s). Vaccination has been one of the most effective medical interventions in human history, though potential safety risks of novel vaccines must be monitored, identified, and quantified. Adverse events must be carefully assessed to define whether they are causally associated with vaccination or coincidence. Neurological adverse events following immunizations are overall rare but with significant morbidity and mortality when they occur. Here, we review neurological conditions seen in the context of prior vaccinations and the current data to date on select COVID-19 vaccines including mRNA vaccine(s) and the adenovirus-vector COVID-19 vaccines, ChAdOx1 nCOV-19 (AstraZeneca) and Ad26.COV2.S Johnson and Johnson (Janssen/J&J).

Timing of Wound Excision

2020 ◽  
pp. 11-14
Keyword(s):  
Surgical Site Infections ◽  
Current Data ◽  
Human Studies ◽  
Bacterial Burden ◽  
Wound Debridement ◽  
The Past ◽  
Severity Of Injury ◽  
Wound Excision ◽  
The Subject ◽  
Intense Debate

The aim of wound excision is to remove contaminating debris and all devitalised tissue. This should reduce both the bacterial burden and available substrate for microbial colonisation, resulting in fewer deep surgical site infections. In turn, this will lead to improved patient outcomes. The timing of wound excision has been the subject of intense debate. In the past, guidelines have favoured wound excision within 6 hours based on historical animal and human studies. Current data suggest that timing of wound debridement should be determined by the degree of contamination and severity of injury.

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