Display options:
Normal
Show Abstracts
Compact
Select/unselect all
Displaying article 129
Research
p. 29042943
Received: 22 December 2013; in revised form: 13 May 2014 / Accepted: 14 May 2014 / Published: 26 May 2014
Show/Hide Abstract
 PDF Fulltext (2080 KB)  HTML Fulltext  XML Fulltext
Abstract: The equation that approximately traces the trajectory in the concentration phase space of chemical kinetics is derived based on the rate of entropy production. The equation coincides with the true chemical kinetics equation to first order in a variable that characterizes the degree of quasiequilibrium for each reaction, and the equation approximates the trajectory along at least final part of onedimensional (1D) manifold of true chemical kinetics that reaches equilibrium in concentration phase space. Besides the 1D manifold, each higher dimensional manifold of the trajectories given by the equation is an approximation to that of true chemical kinetics when the contour of the entropy production rate in the concentration phase space is not highly distorted, because the Jacobian and its eigenvectors for the equation are exactly the same as those of true chemical kinetics at equilibrium; however, the path or trajectory itself is not necessarily an approximation to that of true chemical kinetics in manifolds higher than 1D. The equation is for the path of steepest descent that sufficiently accounts for the constraints inherent in chemical kinetics such as element conservation, whereas the simple steepestdescentpath formulation whose Jacobian is the Hessian of the entropy production rate cannot even approximately reproduce any part of the 1D manifold of true chemical kinetics except for the special case where the eigenvector of the Hessian is nearly identical to that of the Jacobian of chemical kinetics.
p. 29442958
Received: 1 April 2014; in revised form: 21 May 2014 / Accepted: 22 May 2014 / Published: 26 May 2014
Show/Hide Abstract
 PDF Fulltext (237 KB)  HTML Fulltext  XML Fulltext
Abstract: We evaluate the information geometric complexity of entropic motion on lowdimensional Gaussian statistical manifolds in order to quantify how difficult it is to make macroscopic predictions about systems in the presence of limited information. Specifically, we observe that the complexity of such entropic inferences not only depends on the amount of available pieces of information but also on the manner in which such pieces are correlated. Finally, we uncover that, for certain correlational structures, the impossibility of reaching the most favorable configuration from an entropic inference viewpoint seems to lead to an information geometric analog of the wellknown frustration effect that occurs in statistical physics.
p. 29592989
Received: 26 February 2014; in revised form: 2 April 2014 / Accepted: 20 May 2014 / Published: 26 May 2014
Show/Hide Abstract
 PDF Fulltext (2515 KB)  HTML Fulltext  XML Fulltext
Abstract: Assuming that CFD solutions will be more and more used to characterize losses in terms of drag for external flows and head loss for internal flows, we suggest to replace singlevalued data, like the drag force or a pressure drop, by field information about the losses. These information are gained when the entropy generation in the flow field is analyzed, an approach that often is called second law analysis (SLA), referring to the second law of thermodynamics. We show that this SLA approach is straightforward, systematic and helpful when it comes to the physical interpretation of the losses in a flow field. Various examples are given, including external and internal flows, two phase flow, compressible flow and unsteady flow. Finally, we show that an energy transfer within a certain process can be put into a broader perspective by introducing the entropic potential of an energy.
p. 29903008
Received: 14 April 2014; in revised form: 17 May 2014 / Accepted: 21 May 2014 / Published: 26 May 2014
Show/Hide Abstract
 PDF Fulltext (218 KB)  HTML Fulltext  XML Fulltext

Supplementary Files
Abstract: Thermodynamic modeling of extensive systems usually implicitly assumes the additivity of entropy. Furthermore, if this modeling is based on the concept of Shannon entropy, additivity of the latter function must also be guaranteed. In this case, the constituents of a thermodynamic system are treated as subsystems of a compound system, and the Shannon entropy of the compound system must be subjected to constrained maximization. The scope of this paper is to clarify prerequisites for applying the concept of Shannon entropy and the maximum entropy principle to thermodynamic modeling of extensive systems. This is accomplished by investigating how the constraints of the compound system have to depend on mean values of the subsystems in order to ensure additivity. Two examples illustrate the basic ideas behind this approach, comprising the ideal gas model and condensed phase lattice systems as limiting cases of fluid phases. The paper is the first step towards developing a new approach for modeling interacting systems using the concept of Shannon entropy.
p. 30093025
Received: 29 March 2014; in revised form: 29 March 2014 / Accepted: 20 May 2014 / Published: 27 May 2014
Show/Hide Abstract
 PDF Fulltext (788 KB)  HTML Fulltext  XML Fulltext
Abstract: As a novel data mining approach, a wavelet entropy algorithm is used to perform entropy statistics on wavelet coefficients (or reconstructed signals) at various wavelet scales on the basis of wavelet decomposition and entropy statistic theory. Shannon wavelet energy entropy, one kind of wavelet entropy algorithm, has been taken into consideration and utilized in many areas since it came into being. However, as there is wavelet aliasing after the wavelet decomposition, and the information set of differentscale wavelet decomposition coefficients (or reconstructed signals) is nonadditive to a certain extent, Shannon entropy, which is more adaptable to extensive systems, couldn’t do accurate uncertainty statistics on the wavelet decomposition results. Therefore, the transient signal features are extracted incorrectly by using Shannon wavelet energy entropy. From the two aspects, the theoretical limitations and negative effects of wavelet aliasing on extraction accuracy, the problems which exist in the feature extraction process of transient signals by Shannon wavelet energy entropy, are discussed in depth. Considering the defects of Shannon wavelet energy entropy, a novel wavelet entropy named Tsallis wavelet energy entropy is proposed by using Tsallis entropy instead of Shannon entropy, and it is applied to the feature extraction of transient signals in power systems. Theoretical derivation and experimental result prove that compared with Shannon wavelet energy entropy, Tsallis wavelet energy entropy could reduce the negative effects of wavelet aliasing on accuracy of feature extraction and extract transient signal feature of power system accurately.
p. 30263048
Received: 28 March 2014; in revised form: 9 May 2014 / Accepted: 22 May 2014 / Published: 28 May 2014
Show/Hide Abstract
 PDF Fulltext (293 KB)  HTML Fulltext  XML Fulltext
Abstract: We investigate the asymptotic construction of constantrisk Bayesian predictive densities under the Kullback–Leibler risk when the distributions of data and target variables are different and have a common unknown parameter. It is known that the Kullback–Leibler risk is asymptotically equal to a trace of the product of two matrices: the inverse of the Fisher information matrix for the data and the Fisher information matrix for the target variables. We assume that the trace has a unique maximum point with respect to the parameter. We construct asymptotically constantrisk Bayesian predictive densities using a prior depending on the sample size. Further, we apply the theory to the subminimax estimator problem and the prediction based on the binary regression model.
p. 30493061
Received: 14 April 2014; in revised form: 26 May 2014 / Accepted: 27 May 2014 / Published: 30 May 2014
Show/Hide Abstract
 Cited by 1  PDF Fulltext (614 KB)  HTML Fulltext  XML Fulltext
Abstract: In this paper, we propose to use permutation entropy to explore whether the changes in electroencephalogram (EEG) data can effectively distinguish different phases in human absence epilepsy, i.e. , the seizurefree, the preseizure and seizure phases. Permutation entropy is applied to analyze the EEG data from these three phases, each containing 100 19channel EEG epochs of 2 s duration. The experimental results show the mean value of PE gradually decreases from the seizurefree to the seizure phase and provides evidence that these three different seizure phases in absence epilepsy can be effectively distinguished. Furthermore, our results strengthen the view that most frontal electrodes carry useful information and patterns that can help discriminate among different absence seizure phases.
p. 30623073
Received: 5 May 2014; in revised form: 27 May 2014 / Accepted: 27 May 2014 / Published: 3 June 2014
Show/Hide Abstract
 PDF Fulltext (313 KB)  HTML Fulltext  XML Fulltext
Abstract: To explore the existence of selforganization during friction, this paper considers the motion of all atoms in a systems consisting of an Atomic Force Microscope metal tip sliding on a metal slab. The tip and the slab are set in relative motion with constant velocity. The vibrations of individual atoms with respect to that relative motion are obtained explicitly using Molecular Dynamics with Embedded Atom Method potentials. First, we obtain signatures of Self Organized Criticality in that the stickslip jump force probability densities are power laws with exponents in the range (0.5, 1.5) for aluminum and copper. Second, we characterize the dynamical attractor by the entropy content of the overall atomic jittering. We find that in all cases, friction minimizes the entropy and thus makes a strong case for selforganization.
p. 30743102
Received: 29 March 2014; in revised form: 23 May 2014 / Accepted: 28 May 2014 / Published: 3 June 2014
Show/Hide Abstract
 Cited by 1  PDF Fulltext (611 KB)  HTML Fulltext  XML Fulltext
Abstract: Recent work incorporating geometric ideas in Markov chain Monte Carlo is reviewed in order to highlight these advances and their possible application in a range of domains beyond statistics. A full exposition of Markov chains and their use in Monte Carlo simulation for statistical inference and molecular dynamics is provided, with particular emphasis on methods based on Langevin diffusions. After this, geometric concepts in Markov chain Monte Carlo are introduced. A full derivation of the Langevin diffusion on a Riemannian manifold is given, together with a discussion of the appropriate Riemannian metric choice for different problems. A survey of applications is provided, and some open questions are discussed.
p. 31033120
Received: 11 March 2014; in revised form: 25 May 2014 / Accepted: 28 May 2014 / Published: 4 June 2014
Show/Hide Abstract
 PDF Fulltext (408 KB)  HTML Fulltext  XML Fulltext
Abstract: Compressed air energy storage (CAES) is a commercial, utilityscale technology that provides longduration energy storage with fast ramp rates and good partload operation. It is a promising storage technology for balancing the largescale penetration of renewable energies, such as wind and solar power, into electric grids. This study proposes a CAESCC system, which is based on a conventional CAES combined with a steam turbine cycle by waste heat boiler. Simulation and thermodynamic analysis are carried out on the proposed CAESCC system. The electricity and heating rates of the proposed CAESCC system are lower than those of the conventional CAES by 0.127 kWh/kWh and 0.338 kWh/kWh, respectively, because the CAESCC system recycles hightemperature turbineexhausting air. The overall efficiency of the CAESCC system is improved by approximately 10% compared with that of the conventional CAES. In the CAESCC system, compressing intercooler heat can keep the steam turbine on hot standby, thus improving the flexibility of CAESCC. This study brought about a new method for improving the efficiency of CAES and provided new thoughts for integrating CAES with other electricitygenerating modes.
p. 31213135
Received: 8 April 2014; in revised form: 23 May 2014 / Accepted: 29 May 2014 / Published: 5 June 2014
Show/Hide Abstract
 PDF Fulltext (3598 KB)  HTML Fulltext  XML Fulltext
Abstract: Physical implementations of quantum key distribution (QKD) protocols, like the BennettBrassard (BB84), are forced to use attenuated coherent quantum states, because the sources of single photon states are not functional yet for QKD applications. However, when using attenuated coherent states, the relatively high rate of multiphotonic pulses introduces vulnerabilities that can be exploited by the photon number splitting (PNS) attack to brake the quantum key. Some QKD protocols have been developed to be resistant to the PNS attack, like the decoy method, but those define a single photonic gain in the quantum channel. To overcome this limitation, we have developed a new QKD protocol, called ackQKD, which is resistant to the PNS attack. Even more, it uses attenuated quantum states, but defines two interleaved photonic quantum flows to detect the eavesdropper activity by means of the quantum photonic error gain (QPEG) or the quantum bit error rate (QBER). The physical implementation of the ackQKD is similar to the wellknown BB84 protocol.
p. 31363148
Received: 21 January 2014; in revised form: 21 May 2014 / Accepted: 27 May 2014 / Published: 5 June 2014
Show/Hide Abstract
 PDF Fulltext (465 KB)  HTML Fulltext  XML Fulltext
Abstract: In this paper, an improved cascade control strategy is presented for hydroturbine speed governors. Different from traditional proportionalintegralderivative (PID) control and model predictive control (MPC) strategies, the performance index of the outer controller is constructed by integrating the entropy and mean value of the tracking error with the constraints on control energy. The inner controller is implemented by a proportional controller. Compared with the conventional PIDP and MPCP cascade control methods, the proposed cascade control strategy can effectively decrease fluctuations of hydroturbine speed under nonGaussian disturbance conditions in practical hydropower plants. Simulation results show the advantages of the proposed cascade control method.
p. 31493172
Received: 2 April 2014; in revised form: 4 May 2014 / Accepted: 21 May 2014 / Published: 6 June 2014
Show/Hide Abstract
 PDF Fulltext (808 KB)  HTML Fulltext  XML Fulltext
Abstract: The basic microsopic physical laws are time reversible. In contrast, the second law of thermodynamics, which is a macroscopic physical representation of the world, is able to describe irreversible processes in an isolated system through the change of entropy ΔS > 0. It is the attempt of the present manuscript to bridge the microscopic physical world with its macrosocpic one with an alternative approach than the statistical mechanics theory of Gibbs and Boltzmann. It is proposed that time is discrete with constant step size. Its consequence is the presence of time irreversibility at the microscopic level if the present force is of complex nature (F(r) ≠ const ). In order to compare this discrete time irreversible mechamics (for simplicity a “classical”, single particle in a one dimensional space is selected) with its classical Newton analog, time reversibility is reintroduced by scaling the time steps for any given time step n by the variable sn leading to the NoséHoover Lagrangian. The corresponding Nos´eHoover Hamiltonian comprises a term N_{df} k_{B} T ln s_{n} (k_{B} the Boltzmann constant, T the temperature, and Ndf the number of degrees of freedom) which is defined as the microscopic entropy S_{n} at time point n multiplied by T . Upon ensemble averaging this microscopic entropy S_{n} _{} in equilibrium for a system which does not have fast changing forces approximates its macroscopic counterpart known from thermodynamics. The presented derivation with the resulting analogy between the ensemble averaged microscopic entropy and its thermodynamic analog suggests that the original description of the entropy by Boltzmann and Gibbs is just an ensemble averaging of the time scaling variable s_{n} which is in equilibrium close to 1, but that the entropy
p. 31733206
Received: 10 February 2014; in revised form: 20 April 2014 / Accepted: 23 May 2014 / Published: 6 June 2014
Show/Hide Abstract
 PDF Fulltext (314 KB)  HTML Fulltext  XML Fulltext
Abstract: Many thermodynamic relations involve inequalities, with equality if a process does not involve dissipation. In this article we provide equalities in which the dissipative contribution is shown to involve the relative entropy (a.k.a. KullbackLeibler divergence). The processes considered are general time evolutions both in classical and quantum mechanics, and the initial state is sometimes thermal, sometimes partially so. By calculating a transport coefficient we show that indeed—at least in this case—the source of dissipation in that coefficient is the relative entropy.
p. 32073233
Received: 31 March 2014; in revised form: 18 May 2014 / Accepted: 29 May 2014 / Published: 6 June 2014
Show/Hide Abstract
 PDF Fulltext (354 KB)  HTML Fulltext  XML Fulltext
Abstract: We consider three different approaches to define natural Riemannian metrics on polytopes of stochastic matrices. First, we define a natural class of stochastic maps between these polytopes and give a metric characterization of Chentsov type in terms of invariance with respect to these maps. Second, we consider the Fisher metric defined on arbitrary polytopes through their embeddings as exponential families in the probability simplex. We show that these metrics can also be characterized by an invariance principle with respect to morphisms of exponential families. Third, we consider the Fisher metric resulting from embedding the polytope of stochastic matrices in a simplex of joint distributions by specifying a marginal distribution. All three approaches result in slight variations of products of Fisher metrics. This is consistent with the nature of polytopes of stochastic matrices, which are Cartesian products of probability simplices. The first approach yields a scaled product of Fisher metrics; the second, a product of Fisher metrics; and the third, a product of Fisher metrics scaled by the marginal distribution.
p. 32343256
Received: 27 December 2013; in revised form: 10 February 2014 / Accepted: 12 May 2014 / Published: 10 June 2014
Show/Hide Abstract
 PDF Fulltext (457 KB)  HTML Fulltext  XML Fulltext
Abstract: This paper studies the transformation properties of the spatial balance of energy equation for a dissipative material, under the superposition of arbitrary spatial diffeomorphisms. The study reveals that for a dissipative material the transformed energy balance equation has some nonstandard terms in it. These terms are related to a system of microforces with its own balance equation. These microforces act during the superposition of the spatial diffeomorphism, because of the dissipative properties of the material. Moreover, it is shown that for the case in question the stress tensor is additively decomposed into a conventional part given by the standard DoyleEricksen formula and a nonconventional one which is related to changes in the material internal structure in the course of deformation. On the basis of the second law of thermodynamics and the integrability condition of a Pfaffian form it is shown that the nonconventional part of the stress tensor can be related not only to dissipative but also to conservative response. A further insight to this conservative response is provided by exploiting the invariance properties of the balance of energy equation within the context of the material intrinsic “physical” metric concept. In this case, it is shown that the assumption of spatial covariance yields the standard conservation and balance laws of classical mechanics but it does not yield the standard DoyleEricksen formula. In fact, the DoyleEricksen formula has an additional term in it, which is related directly to the evolution of the material internal structure, as it is determined by the (time) evolution of the material metric in the spatial configuration. A formal connection between this term and the Eshelby energymomentum tensor is derived as well.
p. 32573272
Received: 2 May 2014; in revised form: 3 June 2014 / Accepted: 9 June 2014 / Published: 12 June 2014
Show/Hide Abstract
 Cited by 1  PDF Fulltext (136 KB)  HTML Fulltext  XML Fulltext
Abstract: The maximum entropy method was originally proposed as a variational technique to determine probability densities from the knowledge of a few expected values. The applications of the method beyond its original role in statistical physics are manifold. An interesting feature of the method is its potential to incorporate errors in the data. Here, we examine two possible ways of doing that. The two approaches have different intuitive interpretations, and one of them allows for error estimation. Our motivating example comes from the field of risk analysis, but the statement of the problem might as well come from any branch of applied sciences. We apply the methodology to a problem consisting of the determination of a probability density from a few values of its numericallydetermined Laplace transform. This problem can be mapped onto a problem consisting of the determination of a probability density on [0, 1] from the knowledge of a few of its fractional moments up to some measurement errors stemming from insufficient data.
p. 32733301
Received: 15 May 2014; in revised form: 10 June 2014 / Accepted: 13 June 2014 / Published: 17 June 2014
Show/Hide Abstract
 PDF Fulltext (354 KB)  HTML Fulltext  XML Fulltext
Abstract: Clustering sets of histograms has become popular thanks to the success of the generic method of bagofX used in text categorization and in visual categorization applications. In this paper, we investigate the use of a parametric family of distortion measures, called the αdivergences, for clustering histograms. Since it usually makes sense to deal with symmetric divergences in information retrieval systems, we symmetrize the α divergences using the concept of mixed divergences. First, we present a novel extension of k means clustering to mixed divergences. Second, we extend the k means++ seeding to mixed αdivergences and report a guaranteed probabilistic bound. Finally, we describe a soft clustering technique for mixed αdivergences.
p. 33023314
Received: 27 March 2014; in revised form: 27 May 2014 / Accepted: 9 June 2014 / Published: 17 June 2014
Show/Hide Abstract
 PDF Fulltext (1287 KB)  HTML Fulltext  XML Fulltext
Abstract: Heavy rain deteriorates the video quality of outdoor imaging equipments. In order to improve video clearness, imagebased and sensorbased methods are adopted for rain detection. In earlier literature, imagebased detection methods fall into spatiobased and temporalbased categories. In this paper, we propose a new imagebased method by exploring spatiotemporal united constraints in a Bayesian framework. In our framework, rain temporal motion is assumed to be Pathological Motion (PM), which is more suitable to timevarying character of rain steaks. Temporal displaced frame discontinuity and spatial Gaussian mixture model are utilized in the whole framework. Iterated expectation maximization solving method is taken for Gaussian parameters estimation. Pixels state estimation is finished by an iterated optimization method in Bayesian probability formulation. The experimental results highlight the advantage of our method in rain detection.
p. 33153328
Received: 8 February 2014; in revised form: 25 May 2014 / Accepted: 10 June 2014 / Published: 18 June 2014
Show/Hide Abstract
 PDF Fulltext (257 KB)  HTML Fulltext  XML Fulltext
Abstract: It is wellknown that for a given sequence, its optimal codeword length is fixed. Many coding schemes have been proposed to make the codeword length as close to the optimal value as possible. In this paper, a new blockbased coding scheme operating on the subsequences of a source sequence is proposed. It is proved that the optimal codeword lengths of the subsequences are not larger than that of the given sequence. Experimental results using arithmetic coding will be presented.
p. 33293356
Received: 16 January 2014; in revised form: 27 May 2014 / Accepted: 9 June 2014 / Published: 18 June 2014
Show/Hide Abstract
 PDF Fulltext (618 KB)  HTML Fulltext  XML Fulltext
Abstract: To compete in the global marketplace, manufacturers try to differentiate their products by focusing on individual customer needs. Fulfilling this goal requires that companies shift from mass production to mass customization. Under this approach, a generic architecture, named product platform, is designed to support the derivation of customized products through a configuration process that determines which components the product comprises. When a customer configures a derivative, typically not every combination of available components is valid. To guarantee that all dependencies and incompatibilities among the derivative constituent components are satisfied, automated configurators are used. Flexible product platforms provide a big number of interrelated components, and so, the configuration of all, but trivial, derivatives involves considerable effort to select which components the derivative should include. Our approach alleviates that effort by speeding up the derivative configuration using a heuristic based on the information theory concept of entropy.
p. 33573378
Received: 1 March 2014; in revised form: 21 March 2014 / Accepted: 10 June 2014 / Published: 19 June 2014
Show/Hide Abstract
 PDF Fulltext (378 KB)  HTML Fulltext  XML Fulltext
Abstract: Selforganization and survival are inextricably bound to an agent’s ability to control and anticipate its environment. Here we assess both skills when multiple agents compete for a scarce resource. Drawing on insights from psychology, microsociology and control theory, we examine how different assumptions about the behaviour of an agent’s peers in the anticipation process affect subjective control and survival strategies. To quantify control and drive behaviour, we use the recently developed informationtheoretic quantity of empowerment with the principle of empowerment maximization. In two experiments involving extensive simulations, we show that agents develop riskseeking, riskaverse and mixed strategies, which correspond to greedy, parsimonious and mixed behaviour. Although the principle of empowerment maximization is highly generic, the emerging strategies are consistent with what one would expect from rational individuals with dedicated utility models. Our results support empowerment maximization as a universal drive for guided selforganization in collective agent systems.
p. 33793400
Received: 23 March 2014; in revised form: 29 May 2014 / Accepted: 6 June 2014 / Published: 19 June 2014
Show/Hide Abstract
 PDF Fulltext (601 KB)  HTML Fulltext  XML Fulltext
Abstract: Networks have become a popular way to concisely represent complex nonlinear systems where the interactions and parameters are imprecisely known. One challenge is how best to describe the associated dynamics, which can exhibit complicated behavior sensitive to small changes in parameters. A recently developed computational approach that we refer to as a database for dynamics provides a robust and mathematically rigorous description of global dynamics over large ranges of parameter space. To demonstrate the potential of this approach we consider two classical agestructured population models that share the same network diagram and have a similar nonlinear overcompensatory term, but nevertheless yield different patterns of qualitative behavior as a function of parameters. Using a generalization of these models we relate the different structure of the dynamics that are observed in the context of biologically relevant questions such as stable oscillations in populations, bistability, and permanence.
p. 34013415
Received: 27 March 2014; in revised form: 9 June 2014 / Accepted: 17 June 2014 / Published: 20 June 2014
Show/Hide Abstract
 PDF Fulltext (247 KB)  HTML Fulltext  XML Fulltext
Abstract: We propose a continuous maximum entropy method to investigate the robustoptimal portfolio selection problem for the market with transaction costs and dividends.This robust model aims to maximize the worstcase portfolio return in the case that allof asset returns lie within some prescribed intervals. A numerical optimal solution tothe problem is obtained by using a continuous maximum entropy method. Furthermore,some numerical experiments indicate that the robust model in this paper can result in betterportfolio performance than a classical meanvariance model.
p. 34163433
Received: 28 April 2014; in revised form: 14 May 2014 / Accepted: 9 June 2014 / Published: 20 June 2014
Show/Hide Abstract
 PDF Fulltext (1396 KB)  HTML Fulltext  XML Fulltext
Abstract: Inferring the coupling structure of complex systems from time series data in general by means of statistical and informationtheoretic techniques is a challenging problem in applied science. The reliability of statistical inferences requires the construction of suitable informationtheoretic measures that take into account both direct and indirect influences, manifest in the form of information flows, between the components within the system. In this work, we present an application of the optimal causation entropy (oCSE) principle to identify the coupling structure of a synthetic biological system, the repressilator. Specifically, when the system reaches an equilibrium state, we use a stochastic perturbation approach to extract time series data that approximate a linear stochastic process. Then, we present and jointly apply the aggregative discovery and progressive removal algorithms based on the oCSE principle to infer the coupling structure of the system from the measured data. Finally, we show that the success rate of our coupling inferences not only improves with the amount of available data, but it also increases with a higher frequency of sampling and is especially immune to false positives.
p. 34343470
Received: 28 February 2014; in revised form: 23 April 2014 / Accepted: 10 June 2014 / Published: 23 June 2014
Show/Hide Abstract
 Cited by 1  PDF Fulltext (789 KB)  HTML Fulltext  XML Fulltext
Abstract: Traditional answers to what the 2nd Law is are well known. Some are based on the microstate of a system wandering rapidly through all accessible phase space, while others are based on the idea of a system occupying an initial multitude of states due to the inevitable imperfections of measurements that then effectively, in a coarse grained manner, grow in time (mixing). What has emerged are two somewhat less traditional approaches from which it is said that the 2nd Law emerges, namely, that of the theory of quantum open systems and that of the theory of typicality. These are the two principal approaches, which form the basis of what today has come to be called quantum thermodynamics. However, their dynamics remains strictly linear and unitary, and, as a number of recent publications have emphasized, “testing the unitary propagation of pure states alone cannot rule out a nonlinear propagation of mixtures”. Thus, a nontraditional approach to capturing such a propagation would be one which complements the postulates of QM by the 2nd Law of thermodynamics, resulting in a possibly meaningful, nonlinear dynamics. An unorthodox approach, which does just that, is intrinsic quantum thermodynamics and its mathematical framework, steepestentropyascent quantum thermodynamics. The latter has evolved into an effective tool for modeling the dynamics of reactive and nonreactive systems at atomistic scales. It is the usefulness of this framework in the context of quantum thermodynamics as well as the theory of typicality which are discussed here in some detail. A brief discussion of some other trends such as those related to work, work extraction, and fluctuation theorems is also presented.
p. 35373551
Received: 10 March 2014; in revised form: 19 June 2014 / Accepted: 19 June 2014 / Published: 24 June 2014
Show/Hide Abstract
 PDF Fulltext (218 KB)  HTML Fulltext  XML Fulltext
Abstract: In this paper we present a hybrid (i.e., quantumclassical) adaptive protocol for the storage and retrieval of discretevalued information. The purpose of this paper is to introduce a procedure that exhibits how to store and retrieve unanticipated information values by using a quantum property, that of using different vector space bases for preparation and measurement of quantum states. This simple idea leads to an interesting old wish in Artificial Intelligence: the development of computer systems that can incorporate new knowledge on a realtime basis just by hardware manipulation.
Review
p. 34823536
Received: 19 March 2014; in revised form: 9 June 2014 / Accepted: 16 June 2014 / Published: 24 June 2014
Show/Hide Abstract
 PDF Fulltext (29866 KB)  HTML Fulltext  XML Fulltext

Supplementary Files
Abstract: Thermodynamic entropy was initially proposed by Clausius in 1865. Since then it has been implemented in the analysis of different systems, and is seen as a promising concept to understand the evolution of open systems in nonequilibrium conditions. Information entropy was proposed by Shannon in 1948, and has become an important concept to measure information in different systems. Both thermodynamic entropy and information entropy have been extensively applied in different fields related to the Critical Zone, such as hydrology, ecology, pedology, and geomorphology. In this study, we review the most important applications of these concepts in those fields, including how they are calculated, and how they have been utilized to analyze different processes. We then synthesize the link between thermodynamic and information entropies in the light of energy dissipation and organizational patterns, and discuss how this link may be used to enhance the understanding of the Critical Zone.
Other
p. 34713481
Received: 21 April 2014; in revised form: 12 June 2014 / Accepted: 19 June 2014 / Published: 23 June 2014
Show/Hide Abstract
 PDF Fulltext (264 KB)  HTML Fulltext  XML Fulltext
Abstract: An efficient periodic operation to obtain the maximum work from a nonequilibrium initial state in an N–level quantum system is shown. Each cycle consists of a stabilization process followed by an isentropic restoration process. The instantaneous time limit can be taken in the stabilization process from the nonequilibrium initial state to a stable passive state. In the restoration process that preserves the passive state a minimum period is needed to satisfy the uncertainty relation between energy and time. An efficient quantum feedback control in a symmetric two–level quantum system connected to an energy source is proposed.
Select/unselect all
Displaying article 129
Export citation of selected articles as:
Plain Text
BibTeX
BibTeX (without abstracts)
Endnote
Endnote (without abstracts)
Tabdelimited
PubMed XML
DOAJ XML
AGRIS XML