Sequential Optimization of $$\gamma $$ -Decision Rules Relative to Length, Coverage and Number of Misclassifications

Splitter blades located between stator blades in a single-stage axial compressor were proposed and investigated in this work to find their effects on aerodynamic performance and operating stability. Aerodynamic performance of the compressor was evaluated using three-dimensional Reynolds-averaged Navier-Stokes equations using the k-e turbulence model with a scalable wall function. The numerical results for the typical performance parameters without stator splitter blades were validated in comparison with experimental data. The numerical results of a parametric study using four geometric parameters (chord length, coverage angle, height and position) of the stator splitter blades showed that the operational stability of the single-stage axial compressor enhances remarkably using the stator splitter blades. The splitters were effective in suppressing flow separation in the stator domain of the compressor at near-stall condition which affects considerably the aerodynamic performance of the compressor.

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The Evolutionary Dynamics of Decision Rule Selection

10.23943/princeton/9780691139036.003.0008 ◽

2017 ◽

Author(s):

Michael Laver ◽

Ernest Sergenti

Keyword(s):

Decision Rule ◽

Positive Feedback ◽

Party System ◽

Evolutionary Dynamics ◽

Decision Rules ◽

Past Performance ◽

Party Leaders ◽

Track Record ◽

Long Run ◽

Survival Of The Fittest

This chapter extends the survival-of-the-fittest evolutionary environment to consider the possibility that new political parties, when they first come into existence, do not pick decision rules at random but instead choose rules that have a track record of past success. This is done by adding replicator-mutator dynamics to the model, according to which the probability that each rule is selected by a new party is an evolving but noisy function of that rule's past performance. Estimating characteristic outputs when this type of positive feedback enters the dynamic model creates new methodological challenges. The simulation results show that it is very rare for one decision rule to drive out all others over the long run. While the diversity of decision rules used by party leaders is drastically reduced with such positive feedback in the party system, and while some particular decision rule is typically prominent over a certain period of time, party systems in which party leaders use different decision rules are sustained over substantial periods.

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Endogenous Parties, Interaction of Different Decision Rules

10.23943/princeton/9780691139036.003.0006 ◽

2017 ◽

Cited By ~ 1

Author(s):

Michael Laver ◽

Ernest Sergenti

Keyword(s):

Decision Rule ◽

Decision Rules ◽

Party Competition ◽

Competitive Environment ◽

Party Leaders ◽

Robert Axelrod

This chapter attempts to develop more realistic and interesting models in which the set of competing parties is a completely endogenous output of the process of party competition. It also seeks to model party competition when different party leaders use different decision rules in the same setting by building on an approach pioneered in a different context by Robert Axelrod. This involves long-running computer “tournaments” that allow investigation of the performance and “robustness” of decision rules in an environment where any politician using any rule may encounter an opponent using either the same decision rule or some quite different rule. The chapter is most interested in how a decision rule performs against anything the competitive environment might throw against it, including agents using decision rules that are difficult to anticipate and/or comprehend.

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Flexibility Management for Space Logistics Through Decision Rules

ASCEND 2020 ◽

10.2514/6.2020-4187 ◽

2020 ◽

Author(s):

Hao Chen ◽

Brian Gardner ◽

Paul T. Grogan ◽

Koki Ho

Keyword(s):

Decision Rules

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