Two-region analysis of pulsing data in fast critical systems

1975 ◽  
Vol 128 (2) ◽  
pp. 379-403 ◽  
Author(s):  
G.S. Brunson ◽  
R.J. Huber
Author(s):  
Pierre-Loïc Garoche

The verification of control system software is critical to a host of technologies and industries, from aeronautics and medical technology to the cars we drive. The failure of controller software can cost people their lives. This book provides control engineers and computer scientists with an introduction to the formal techniques for analyzing and verifying this important class of software. Too often, control engineers are unaware of the issues surrounding the verification of software, while computer scientists tend to be unfamiliar with the specificities of controller software. The book provides a unified approach that is geared to graduate students in both fields, covering formal verification methods as well as the design and verification of controllers. It presents a wealth of new verification techniques for performing exhaustive analysis of controller software. These include new means to compute nonlinear invariants, the use of convex optimization tools, and methods for dealing with numerical imprecisions such as floating point computations occurring in the analyzed software. As the autonomy of critical systems continues to increase—as evidenced by autonomous cars, drones, and satellites and landers—the numerical functions in these systems are growing ever more advanced. The techniques presented here are essential to support the formal analysis of the controller software being used in these new and emerging technologies.


2011 ◽  
Vol 31 (1) ◽  
pp. 281-285
Author(s):  
Huan HE ◽  
Zhong-wei XU ◽  
Gang YU ◽  
Shi-yu YANG

1996 ◽  
Vol 61 (5) ◽  
pp. 681-690
Author(s):  
Kamil Wichterle ◽  
Tomáš Svěrák

Violent agitation of liquids in mixing vessels may result in the regime of surface aeration being attained when the bubbles formed at the liquid surface enter the impeller region. Analysis of data on surface aeration for different liquids in a set of geometrically similar agitated vessels is presented. Data on the just aerated state as observed visually in transparent liquids, and data for the efficient aeration as determined from the break on the power number curve are considered. A simple model is developed for correlation of the data which enables the threshold of aeration to be predicted from the value of the recirculation number Nc = Nd (ρ/σg)1/4. The possibility of interpreting various literature data for the aeration threshold and for the power input with use of Nc is demonstrated. Similar modelling rules hold also for the correlation of beginning of the efficient liquid-liquid dispersion.


Author(s):  
Jenny Andersson

The book proposes that the Cold War period saw a key debate about the future as singular or plural. Forms of Cold War science depicted the future as a closed sphere defined by delimited probabilities, but were challenged by alternative notions of the future as a potentially open realm with limits set only by human creativity. The Cold War was a struggle for temporality between the two different future visions of the two blocs, each armed with its set of predictive technologies, but these were rivaled, from the 1960s on, by future visions emerging from decolonization and the emergence of a set of alternative world futures. Futures research has reflected and enacted this debate. In so doing, it offers a window to the post-war history of the social sciences and of contemporary political ideologies of liberalism and neoliberalism, Marxism and revisionist Marxism, critical-systems thinking, ecologism, and postcolonialism.


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