Self-tuning and stochastic resonance in a simple threshold system—a filter theory approach

2007 ◽  
Vol 375 (2) ◽  
pp. 492-498 ◽  
Author(s):  
Toyonori Munakata ◽  
Takahiro Hada ◽  
Michihito Ueda
Keyword(s):  
Stochastic Resonance ◽  
Theory Approach ◽  
Filter Theory ◽  
System A ◽  
Self Tuning

scholarly journals Ritual Systems, Ritualized Bodies, and the Laws of Liturgical Development

2019 ◽  
Vol 49 (1) ◽  
pp. 89-110
Author(s):  
Kimberly Hope Belcher
Keyword(s):  
Status Quo ◽  
Performance Theory ◽  
Theory Approach ◽  
System A ◽  
Colonial Expansion ◽  
Rapid Changes ◽  
Liturgical Texts ◽  
The Status ◽  
Ritual Systems ◽  
And Linguistics

The “laws” of comparative liturgical development (Baumstark, Taft) are derived from pre-modern liturgical texts and the findings of early biology and linguistics. Yet Christian liturgy is not an organically evolving species; it is a ritual system, a cultural, political, self-regulating, self-reproducing set of rites that are used to interpret and correct one another. Focusing on the reception of new practices by practiced communities, a performance theory approach spotlights the systemic interrelationships of rites and the ritual habitus of human bodies. A ritual system makes particular meanings seem natural, permitting some new liturgical developments, impeding others. Ritualized bodies constrain rapid changes, while the entrance of bodies ritualized in a different system changes the environment, leading some to attempt to reinforce the status quo. Technologies for passing on liturgies are developed and used when a crisis demands change or imperils valued practice. Accounting for differences in liturgical recording, early and medieval liturgical reception may inform our understanding of the colonial expansion of liturgy, when technologies for transmitting liturgical rites were brought to bear on bodies ritualized in indigenous systems of the Americas, Africa, and Asia. Performative evidence from the colonial context may in turn help interpret ambiguous sources from earlier periods.

A lattice theory approach to the structure of mental models

1990 ◽  
Vol 327 (1241) ◽  
pp. 577-583 ◽  
Keyword(s):  
Physical System ◽  
Mental Model ◽  
Lattice Theory ◽  
Decision Aids ◽  
Structure And Function ◽  
Theory Approach ◽  
System A ◽  
Physical Form ◽  
And Function ◽  
Objective Description

Lattice theory is proposed to provide a formalism for the knowledge base used as a mental model by the operator of a complex system. The ordering relation ‘>’ is interpreted as ‘is caused by’, and the lattice becomes a representation of the operator’s causal hypotheses about the system. A given system can be thought of causally in different ways (purposes, mechanics, physical form, etc.). Each gives rise to a separate lattice. These are related to each other and to an objective description of the structure and function of the physical system by homomorphic mappings. Errors arise when nodes on the mental lattices are not connected in the same way as the physical system lattice; when the latter changes so that the mental lattice no longer provides an accurate map, even as a homomorphism; or when inverse one-to-many mapping gives rise to ambiguities. Some suggestions are made about the design of displays and decision aids to reduce error.

Fuzzy PID Control and Simulation of Wind Power Generation Yaw System

2014 ◽  
Vol 953-954 ◽  
pp. 353-356 ◽  
Author(s):  
Fan Yang ◽  
Tong Yang ◽  
Xiao Hong Yang
Keyword(s):  
Pid Control ◽  
Pid Controller ◽  
Fuzzy Pid ◽  
Fuzzy Pid Control ◽  
Fuzzy Pid Controller ◽  
Time Performance ◽  
System A ◽  
Self Tuning ◽  
Simulation Results ◽  
The Stability

Aimed at the high inertia and non-linear characteristics of yaw system, a parameter self –tuning fuzzy PID controller is designed. The controller can adjust the PID parameters based on the wind direction variation, and make the turbines track the coming wind timely to obtain maximum power output. Simulation results show that the controller has good real-time performance and robustness compared with the traditional PID control. It can lower the fluctuation and overshoot, and improve the stability of the yaw system significantly.

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