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  • 1
    Electronic Resource
    Electronic Resource
    An intelligent agent with layered architecture for operating systems resource management (2003)
    Oxford, UK : Blackwell Publishing
    Expert systems 20 (2003), S. 0 
    Details
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Abstract: A software agent is defined as an autonomous software entity that is able to interact with its environment. Such an agent is able to respond to other agents and/or its environment to some degree, and has some sort of control over its internal state and actions. In belief–desire–intention (BDI) theory, an agent's behavior is described in terms of a processing cycle. In this paper, based on BDI theory, the processing cycle is studied with a software feedback mechanism. A software feedback or loop-back control mechanism can perform functions without direct external intervention. A feedback mechanism can continuously monitor the output of the system under control (the target system), compare the result against preset values (goals of the feedback control) and feed the difference back to adjust the behavior of the target system in a processing cycle. We discuss the modeling and design aspects of an autonomous, adaptive monitoring agent with layered control architecture. The architecture consists of three layers: a scheduling layer, an optimizing layer and a regulating layer. Experimental results show that the monitoring agent developed for an e-mail server is effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-0394.00241
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  • 2
    Electronic Resource
    Electronic Resource
    Fast tree search for enumeration of a lattice model of protein folding (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 352-359 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a fast tree-searching algorithm and a Pentium cluster, we enumerated all the sequences and compact conformations (structures) for a protein folding model on a cubic lattice of size 4×3×3. We used two types of amino acids—hydrophobic (H) and polar (P)—to make up the sequences, so there were 236(approximate)6.87×1010 different sequences. The total number of distinct structures was 84 731 192. We made use of a simple solvation model in which the energy of a sequence folded into a structure is minus the number of hydrophobic amino acids in the "core" of the structure. For every sequence, we found its ground state or ground states, i.e., the structure or structures for which its energy is lowest. About 0.3% of the sequences have a unique ground state. The number of structures that are unique ground states of at least one sequence is 2 662 050, about 3% of the total number of structures. However, these "designable" structures differ drastically in their designability, defined as the number of sequences whose unique ground state is that structure. To understand this variation in designability, we studied the distribution of structures in a high dimensional space in which each structure is represented by a string of 1's and 0's, denoting core and surface sites, respectively. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1423324
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  • 3
    Electronic Resource
    Electronic Resource
    Preface (1998)
    Springer
    Journal of statistical physics 93 (1998), S. 407-409 
    Details
    ISSN: 1572-9613
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOSS.0000033228.20564.cd
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  • 4
    Electronic Resource
    Electronic Resource
    Mean field theory of self-organized critical phenomena (1988)
    Springer
    Journal of statistical physics 51 (1988), S. 797-802 
    Details
    ISSN: 1572-9613
    Keywords: Self-organized criticality ; critical exponents ; mean field theory ; 1/f noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A mean field theory is presented for the recently discovered self-organized critical phenomena. The critical exponents are calculated and found to be the same as the mean field values for percolation. The power spectrum has “1/f” behavior with exponentg4=1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014884
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  • 5
    Electronic Resource
    Electronic Resource
    Contrast dependence of colour and luminance motion mechanisms in human vision (1994)
    [s.l.] : Nature Publishing Group
    Nature 367 (1994), S. 268-270 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We measured the perceived velocity of grating patterns of low spatial frequency as a function of contrast for slow (1 deg s"1) and moderate velocities (8 deg s"1). Gratings were either modulated in luminance or modulated along a red/green line in the isoluminant plane4. The slope of the function ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/367268a0
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  • 6
    Electronic Resource
    Electronic Resource
    Application Research on Expert System of Incremental In-Plane Bending (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 600-605 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Incremental in-plane bending is a flexible and laborsaving manufacturing technology forshort production runs in a variety of sizes and shapes. But the technology parameters are interactiveintimately and it is hard to forecast and control the bending radius accurately. Based on the features ofincremental in-plane bending and the advantage of expert system dealing with problems, an expertsystem of incremental in-plane bending by designing knowledge base of representation of creationregulation, reasoning system based on rules and search mechanism and explaining system based onprefabricating text has been researched and developed in this paper. The system, making use of ADOtechnology, Access database and Visual Basic, develops knowledge base, database and reasoningsystem. Based on client / server model, the system realizes a seamless link between Visual Basic andMatlab by using ActiveX. The system can perform functions of bending radius forecasting andforming program evaluating and optimizing. It has a friendly interface and it is easy to operate andconvenient for maintenance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.600.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fractal Dimension of Julia Set for Nonanalytic Maps (1998)
    Springer
    Journal of statistical physics 93 (1998), S. 1001-1008 
    Details
    ISSN: 1572-9613
    Keywords: Fractal dimension ; Julia set ; nonanalytic maps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Hausdorff dimensions of the Julia sets for nonanalytic maps f(z) = z 2+εz* and f(z)=z*2+ε are calculated perturbatively for small ε. It is shown that Ruelle's formula for the Hausdorff dimensions of analytic maps cannot be generalized to nonanalytic maps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOSS.0000033174.46243.d4
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  • 8
    Electronic Resource
    Electronic Resource
    A physicist's sandbox (1989)
    Springer
    Journal of statistical physics 54 (1989), S. 1441-1458 
    Details
    ISSN: 1572-9613
    Keywords: Self-organization ; external noise ; criticality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss some recent results suggesting that certain spatially extended dynamical systems naturally evolve toward a state characterized by domains of all length scales. The analogy with second-order phase transitions has prompted the name “self-organized criticality” specific results are available for cellular automaton models, which can be thought of as caricatures of a sandpile undergoing avalances. The potential generality of the results stems from the very simple (nonlinear) diffusion dynamics governing the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01044728
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  • 9
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    Arabidopsis DET1 degrades HFR1 but stabilizes PIF1 to precisely regulate seed germination (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-03-09
    Description: Seed is an essential propagation organ and a critical strategy adopted by terrestrial flowering plants to colonize the land. The ability of seeds to accurately respond to light is vital for plant survival. However, the underlying mechanism is largely unknown. In this study, we reveal a circuit of triple feed-forward loops adopted by Arabidopsis seeds to exclusively repress germination in dark conditions and precisely initiate germination under diverse light conditions. We identify that de-etiolated 1 (DET1), an evolutionarily conserved protein, is a central repressor of light-induced seed germination. Genetic analysis demonstrates that DET1 functions upstream of long hypocotyl in far-red 1 (HFR1) and phytochrome interacting factor 1 (PIF1), the key positive and negative transcription regulators in seed germination. We further find that DET1 and constitutive photomorphogenic 10 (COP10) target HFR1 for protein degradation by assembling a COP10–DET1–damaged DNA binding protein 1–cullin4 E3 ligase complex. Moreover, DET1 and COP10 directly interact with and promote the protein stability of PIF1. Computational modeling reveals that phytochrome B (phyB)–DET1–HFR1–PIF1 and phyB–DET1–Protease–PIF1 are new signaling pathways, independent of the previously identified phyB-PIF1 pathway, respectively mediating the rapid and time-lapse responses to light irradiation. The model-simulated results are highly consistent with their experimental validations, suggesting that our mathematical model captures the essence of Arabidopsis seed germination networks. Taken together, this study provides a comprehensive molecular framework for light-regulated seed germination, improving our understanding of how plants respond to changeable environments.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Optimal compressed sensing strategies for an array of nonlinear olfactory receptor neurons with and without spontaneous activity (2019)
    National Academy of Sciences
    Details
    Publication Date: 2019-09-23
    Description: There are numerous different odorant molecules in nature but only a relatively small number of olfactory receptor neurons (ORNs) in brains. This “compressed sensing” challenge is compounded by the constraint that ORNs are nonlinear sensors with a finite dynamic range. Here, we investigate possible optimal olfactory coding strategies by maximizing mutual information between odor mixtures and ORNs’ responses with respect to the bipartite odor-receptor interaction network (ORIN) characterized by sensitivities between all odorant–ORN pairs. For ORNs without spontaneous (basal) activity, we find that the optimal ORIN is sparse—a finite fraction of sensitives are zero, and the nonzero sensitivities follow a broad distribution that depends on the odor statistics. We show analytically that sparsity in the optimal ORIN originates from a trade-off between the broad tuning of ORNs and possible interference. Furthermore, we show that the optimal ORIN enhances performances of downstream learning tasks (reconstruction and classification). For ORNs with a finite basal activity, we find that having inhibitory odor–receptor interactions increases the coding capacity and the fraction of inhibitory interactions increases with the ORN basal activity. We argue that basal activities in sensory receptors in different organisms are due to the trade-off between the increase in coding capacity and the cost of maintaining the spontaneous basal activity. Our theoretical findings are consistent with existing experiments and predictions are made to further test our theory. The optimal coding model provides a unifying framework to understand the peripheral olfactory systems across different organisms.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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