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Additional Flexibilities (additional + flexibility)

Distribution by Scientific Domains
Engineering50%

Selected Abstracts

Some applications of fuzzy logic in rule,based expert systems

EXPERT SYSTEMS, Issue 4 2002
Trung T. Pham
Fuzzy logic has been used as a means of interpreting vague, incomplete and even contradictory information into a compromised rule base in artificial intelligence such as machine decision,making. Within this context, fuzzy logic can be applied in the field of expert systems to provide additional flexibilities in constructing a working rule base: different experts' opinions can be incorporated into the same rule base, and each opinion can be modeled in a rather vague notion of human language. As some illustrative application examples, this paper describes how fuzzy logic can be used in expert systems. More precisely, it demonstrates the following applications: (i) a healthcare diagnostic system, (ii) an autofocus camera lens system and (iii) a financial decision system. For each application, basic rules are described, the calculation method is outlined and numerical simulation is provided. These applications demonstrate the suitability and performance of fuzzy logic in expert systems. [source]

Insulin-like growth factor-binding protein-1: an evolutionarily conserved fine tuner of insulin-like growth factor action under catabolic and stressful conditions

JOURNAL OF FISH BIOLOGY, Issue 2007
S. Kajimura
The insulin-like growth factor-binding proteins (IGFBPs) are evolutionarily conserved components of the insulin-like growth factor (IGF) system. The six forms of IGFBPs (IGFBP-1,6) bind the IGF ligands (IGF-1 and -2) with high affinity and regulate the IGFs available to their receptors, therefore providing additional flexibilities in regulating IGF signalling. IGFBP-1, the first identified member of the IGFBP family is highly inducible under a variety of catabolic conditions, such as food deprivation, malnutrition, stress, injury and hypoxia. Recent in vivo studies have indicated that the induced IGFBP-1 serves as a molecular switch by restricting IGF signalling and diverts the limited energy resources away from growth and development towards those metabolic processes essential for survival. This article reviews the recent understandings of the molecular basis of IGFBP-1 regulation and its biological functions, as revealed through research in mammalian and fish models. [source]

On Constraining Pilot Point Calibration with Regularization in PEST

GROUND WATER, Issue 6 2009
Michael N. Fienen
Ground water model calibration has made great advances in recent years with practical tools such as PEST being instrumental for making the latest techniques available to practitioners. As models and calibration tools get more sophisticated, however, the power of these tools can be misapplied, resulting in poor parameter estimates and/or nonoptimally calibrated models that do not suit their intended purpose. Here, we focus on an increasingly common technique for calibrating highly parameterized numerical models,pilot point parameterization with Tikhonov regularization. Pilot points are a popular method for spatially parameterizing complex hydrogeologic systems; however, additional flexibility offered by pilot points can become problematic if not constrained by Tikhonov regularization. The objective of this work is to explain and illustrate the specific roles played by control variables in the PEST software for Tikhonov regularization applied to pilot points. A recent study encountered difficulties implementing this approach, but through examination of that analysis, insight into underlying sources of potential misapplication can be gained and some guidelines for overcoming them developed. [source]

Stakeholder Involvement in the Design of U.S. Voluntary Environmental Programs: Does Sponsorship Matter?

POLICY STUDIES JOURNAL, Issue 4 2003
JoAnn Carmin
Voluntary environmental programs (VEPs) promise to provide firms and facilities additional flexibility in managing their environmental affairs while increasing internal efficiencies and improving their public image. Although stakeholder input is thought to improve program development, little is known about the extent that stakeholders are involved in the VEP design process. Based on a survey of 61 program managers, this research distinguishes between the intensity and diversity of stakeholder involvement and uses these two concepts to assess VEP development relative to government, industry, and third-party sponsorship. Even in the absence of a mandate, all three sponsors include a variety of stakeholders in program design. Although there is evidence that collaborative relationships are developing between sponsors and a range of stakeholder groups, variations in the intensity of involvement among sponsors suggest that some stakeholders may have disproportionate levels of influence in the design of VEPs. [source]