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This paper introduces the technique of separation, which replaces a design optimization problem with a set of subproblems. This separation is similar to decomposition but does not require a second-level coordination. We identify conditions under which this separation yields an exact solution and other conditions under which the error can be bounded. We show(More)
Developing complex behaviors for aquatic robots is a difficult en- gineering challenge due to the uncertainty of an underwater environment. Neuroevolution provides one method of dealing with this type of problem. Artificial neural networks discern different conditions by mapping sensory input to responses, and evolutionary computation provides a training(More)
Q Approximate vs. Analytical Methods – Need for approximate methods • In general there are few closed-form engineering solutions for the distribution types of the dependent variable Y = g(X). • Mathematical expectation of this function provides solutions for simple cases, i.e., linear random variables. • For cases that involve a more complex g(X), or a(More)
Designing a robotic fish is a challenging endeavor due to the non-linear dynamics of underwater environments. In this paper , we present an evolutionary computation approach for designing the caudal fin of a carangiform robotic fish. Evolutionary experiments are performed in a simulated environment utilizing a mathematical model to approximate the(More)
  • Pollaphat Nitithamyong, Mirosław J Skibniewski, A James Clark
  • 2006
SUMMARY: The effectiveness and usefulness of Web-based project management system (WPMS) applications in construction projects are still not yet as high as initially expected, mainly because many important factors that can greatly impact system performance are left unknown or misunderstood by most practitioners. Understanding which factors are critical for(More)
Fusarium head blight (FHB), or head scab, is an economically important disease of wheat (Triticum aestivum L.). In developing FHB-resistant soft winter wheat cultivars, breeders have relied on phenotypic selection, marker assisted selection (MAS), or a combination of the two. The objectives of this study were to estimate heritability of resistance in a(More)
Many robotic systems experience fluctuating dynamics during their lifetime. Variations can be attributed in part to material degradation and decay of mechanical hardware. One approach to mitigating these problems is to utilize an adaptive controller. For example, in model-free adaptive control (MFAC) a controller learns how to drive a system by continually(More)
—In this paper, we apply evolutionary multiobjective optimization to the design of a robotic fish with a flexible caudal fin. Specifically, we use the NSGA-II algorithm to discover solutions (physical dimensions, flexibility, and control parameters) that optimize both swimming performance and power efficiency. The optimization is conducted in a custom(More)
A large-scale of civil infrastructure systems is associated with great amounts of project resources and activities interoperated with various participants and organizations. Well-defined methodology for information acquisition and communication became more critical in the management of civil infrastructure than ever before. Rapidly emerging wireless sensor(More)
Introduction. Web-based applications are highly accessible to users, providing rich, interactive content while eliminating the need to install software locally. Previous online evolutionary demonstrations (PicBreeder [Secretan et al., 2008], Endless Forms [Clune and Lipson, 2011], Lu-dobots [Bongard et al., 2012], and BoxCar2D) have successfully(More)