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Sample records for bounded rationality implications

  1. Bounded Rationality

    Directory of Open Access Journals (Sweden)

    Ballester Pla, Coralio

    2012-03-01

    Full Text Available The observation of the actual behavior by economic decision makers in the lab and in the field justifies that bounded rationality has been a generally accepted assumption in many socio-economic models. The goal of this paper is to illustrate the difficulties involved in providing a correct definition of what a rational (or irrational agent is. In this paper we describe two frameworks that employ different approaches for analyzing bounded rationality. The first is a spatial segregation set-up that encompasses two optimization methodologies: backward induction and forward induction. The main result is that, even under the same state of knowledge, rational and non-rational agents may match their actions. The second framework elaborates on the relationship between irrationality and informational restrictions. We use the beauty contest (Nagel, 1995 as a device to explain this relationship.

    La observación del comportamiento de los agentes económicos tanto en el laboratorio como en la vida real justifica que la racionalidad acotada sea un supuesto aceptado en numerosos modelos socio-económicos. El objetivo de este artículo es ilustrar las dificultades que conlleva una correcta definición de qué es un agente racional (irracional. En este artículo se describen dos marcos que emplean diferentes metodologías para analizar la racionalidad acotada. El primero es un modelo de segregación espacial donde se contrastan dos metodologías de optimización: inducción hacia atrás y hacia adelante. El resultado principal es que, incluso con el mismo nivel de conocimiento, tanto agentes racionales como irracionales podrían coincidir en sus acciones. El segundo marco trabaja sobre la relación entre irracionalidad y restricción de información. Se utiliza el juego llamado “beauty contest” (Nagel 1995 como mecanismo para explicar dicha relación.

  2. Information, Utility & Bounded Rationality

    CERN Document Server

    Ortega, Pedro A

    2011-01-01

    Perfectly rational decision-makers maximize expected utility, but crucially ignore the resource costs incurred when determining optimal actions. Here we employ an axiomatic framework for bounded rational decision-making based on a thermodynamic interpretation of resource costs as information costs. This leads to a variational "free utility" principle akin to thermodynamical free energy that trades off utility and information costs. We show that bounded optimal control solutions can be derived from this variational principle, which leads in general to stochastic policies. Furthermore, we show that risk-sensitive and robust (minimax) control schemes fall out naturally from this framework if the environment is considered as a bounded rational and perfectly rational opponent, respectively. When resource costs are ignored, the maximum expected utility principle is recovered.

  3. Recursivity and Self-Referentiality of Economic Theories and Their Implications for Bounded Rational Actors

    OpenAIRE

    Lehmann-Waffenschmidt, Marco; Sandri, Serena

    2007-01-01

    This study aims at the analysis of the possible self-referential effects of economic theories and models on its own subject and of the mechanisms through which bounded rational actors perceive the self-referential nature of economic theories and might absorb their prescriptions. Thus, the focus of the present study will be on the effects of economic theories on the behaviour of the analyzed economic actors. The analysis of the possible causal role of theories on bounded rational economic beha...

  4. Maps of Bounded Rationality

    OpenAIRE

    Kahneman, Daniel

    2002-01-01

    The work cited by the Nobel committee was done jointly with the late Amos Tversky (1937-1996) during a long and unusually close collaboration. Together, we explored the psychology of intuitive beliefs and choices and examined their bounded rationality. This essay presents a current perspective on the three major topics of our joint work: heuristics of judgment, risky choice, and framing effects. In all three domains we studied intuitions - thoughts and preferences that come to mind quickly an...

  5. Bounded Rationality in Transposition Processes

    DEFF Research Database (Denmark)

    Vollaard, Hans; Martinsen, Dorte Sindbjerg

    2014-01-01

    concerns the organisation and financing of national healthcare systems. This article applies the perspective of bounded rationality to explain (irregularities in) the timely and correct transposition of EU directives. The cognitive and organisational constraints long posited by the bounded rationality...... bounded rationality is apparent in the transposition processes in these relatively well-organised countries, future transposition studies should devote greater consideration to the bounded rationality perspective....

  6. Transaction Costs and Bounded Rationality - Implications for Public Administration and Economic Policy

    OpenAIRE

    Tisdell, Clement A.

    2004-01-01

    Relationships between bounded rationality and transaction cost theories are discussed and their connections with stochastic theories of industrial evolution are considered. While these theories have their limitations, they are useful but have been ignored in many public policy prescriptions, especially those involving markets. For example, as discussed, these theories have failed, on the whole, to influence competition policy and the design of more efficient systems for public administration ...

  7. Bounded Rationality, Retaliation, and the Spread of Urban Violence

    Science.gov (United States)

    Jacobs, Bruce A.; Wright, Richard

    2010-01-01

    Drawing from in-depth interviews with 52 active street criminals, this article examines the grounded theoretic implications of bounded rationality for retaliatory street violence. The bounds on rationality that this article explores are anger, uncertainty, and time pressure. These bounds create imperfections in the retaliatory decision-making…

  8. Bounded rationality and heterogeneous expectations in macroeconomics

    NARCIS (Netherlands)

    D. Massaro

    2012-01-01

    This thesis studies the effect of individual bounded rationality on aggregate macroeconomic dynamics. Boundedly rational agents are specified as using simple heuristics in their decision making. An important aspect of the type of bounded rationality described in this thesis is that the population of

  9. Bounded rationality and learning in market competition

    OpenAIRE

    Tuinstra, J.; Hommes, C.H.; Kopányi, D.

    2015-01-01

    This thesis promotes the use of bounded rationality in economic models. The assumption of perfect rationality often imposes high informational and computational burden on economic agents and predictions based on this assumption are not in line with observed behavior in some cases. Models of bounded rationality may better explain actual behavior in such situations. In the thesis we consider market models where firms are boundedly rational: they do not know the demand for their product and they...

  10. Consumer choice and revealed bounded rationality

    OpenAIRE

    Manzini, Paola; Mariotti, Marco

    2006-01-01

    We study two boundedly rational procedures in consumer behavior. We show that these procedures can be detected by conditions on observable demand data of the same type as standard revealed preference axioms. This provides the basis for a non-parametric analysis of boundedly rational consumer behavior mirroring the classical one for utility maximization.

  11. The neural basis of bounded rational behavior

    OpenAIRE

    Coricelli, Giorgio; Nagel, Rosemarie

    2010-01-01

    Bounded rational behaviour is commonly observed in experimental games and in real life situations. Neuroeconomics can help to understand the mental processing underlying bounded rationality and out-of-equilibrium behaviour. Here we report results from recent studies on the neural basis of limited steps of reasoning in a competitive setting —the beauty contest game. We use functional magnetic resonance imaging (fMRI) to study the neural correlates of human mental processes in strategic games. ...

  12. Bounded Rationality of Generalized Abstract Fuzzy Economies

    Directory of Open Access Journals (Sweden)

    Lei Wang

    2014-01-01

    Full Text Available By using a nonlinear scalarization technique, the bounded rationality model M for generalized abstract fuzzy economies in finite continuous spaces is established. Furthermore, by using the model M, some new theorems for structural stability and robustness to (λ,ϵ-equilibria of generalized abstract fuzzy economies are proved.

  13. Of Models and Machines: Implementing Bounded Rationality.

    Science.gov (United States)

    Dick, Stephanie

    2015-09-01

    This essay explores the early history of Herbert Simon's principle of bounded rationality in the context of his Artificial Intelligence research in the mid 1950s. It focuses in particular on how Simon and his colleagues at the RAND Corporation translated a model of human reasoning into a computer program, the Logic Theory Machine. They were motivated by a belief that computers and minds were the same kind of thing--namely, information-processing systems. The Logic Theory Machine program was a model of how people solved problems in elementary mathematical logic. However, in making this model actually run on their 1950s computer, the JOHNNIAC, Simon and his colleagues had to navigate many obstacles and material constraints quite foreign to the human experience of logic. They crafted new tools and engaged in new practices that accommodated the affordances of their machine, rather than reflecting the character of human cognition and its bounds. The essay argues that tracking this implementation effort shows that "internal" cognitive practices and "external" tools and materials are not so easily separated as they are in Simon's principle of bounded rationality--the latter often shaping the dynamics of the former. PMID:26685521

  14. Valuation models and Simon's bounded rationality

    Directory of Open Access Journals (Sweden)

    Alexandra Strommer de Farias Godoi

    2009-09-01

    Full Text Available This paper aims at reconciling the evidence that sophisticated valuation models are increasingly used by companies in their investment appraisal with the literature of bounded rationality, according to which objective optimization is impracticable in the real world because it would demand an immense level of sophistication of the analytical and computational processes of human beings. We show how normative valuation models should rather be viewed as forms of reality representation, frameworks according to which the real world is perceived, fragmented for a better understanding, and recomposed, providing an orderly method for undertaking a task as complex as the investment decision.

  15. Bounded Rationality and Tacit Knowledge in the Organizational Capabilities Approach

    OpenAIRE

    Foss, Nikolaj J.

    2004-01-01

    The famous three chapters in Nelson and Winter (1982) that focus on firm routines and capabilities are often taken to be solidly founded on an assumption of bounded rationality. I argue that, in actuality, bounded rationality plays a rather limited role in Nelson and Winter (1982), that the very different assumption of tacit knowledge is much more central, and that the links between bounded rationality and routines/capabilities are not clear. I then argue that the absence in Nelson and Winter...

  16. Lying for the Greater Good: Bounded Rationality in a Team

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    Oktay Sürücü

    2014-10-01

    Full Text Available This paper is concerned with the interaction between fully and boundedly rational agents in situations where their interests are perfectly aligned. The cognitive limitations of the boundedly rational agent do not allow him to fully understand the market conditions and lead him to take non-optimal decisions in some situations. Using categorization to model bounded rationality, we show that the fully rational agent can nudge, i.e., he can manipulate the information he sends and decrease the expected loss caused by the boundedly rational agent. Assuming different types for the boundedly rational agent, who differ only in the categories used, we show that the fully rational agent may learn the type of the boundedly rational agent along their interaction. Using this additional information, the outcome can be improved and the amount of manipulated information can be decreased. Furthermore, as the length of the interaction increases the probability that the fully rational agent learns the type of the boundedly rational agent grows

  17. The neural basis of bounded rational behavior

    Directory of Open Access Journals (Sweden)

    Coricelli, Giorgio

    2012-03-01

    Full Text Available Bounded rational behaviour is commonly observed in experimental games and in real life situations. Neuroeconomics can help to understand the mental processing underlying bounded rationality and out-of-equilibrium behaviour. Here we report results from recent studies on the neural basis of limited steps of reasoning in a competitive setting —the beauty contest game. We use functional magnetic resonance imaging (fMRI to study the neural correlates of human mental processes in strategic games. We apply a cognitive hierarchy model to classify subject’s choices in the experimental game according to the degree of strategic reasoning so that we can identify the neural substrates of different levels of strategizing. We found a correlation between levels of strategic reasoning and activity in a neural network related to mentalizing, i.e. the ability to think about other’s thoughts and mental states. Moreover, brain data showed how complex cognitive processes subserve the higher level of reasoning about others. We describe how a cognitive hierarchy model fits both behavioural and brain data.

    La racionalidad limitada es un fenómeno observado de manera frecuente tanto en juegos experimentales como en situaciones cotidianas. La Neuroeconomía puede mejorar la comprensión de los procesos mentales que caracterizan la racionalidad limitada; en paralelo nos puede ayudar a comprender comportamientos que violan el equilibrio. Nuestro trabajo presenta resultados recientes sobre la bases neuronales del razonamiento estratégico (y sus límite en juegos competitivos —como el juego del “beauty contest”. Estudiamos las bases neuronales del comportamiento estratégico en juegos con interacción entre sujetos usando resonancia magnética funcional (fMRI. Las decisiones de los participantes se clasifican acorde al grado de razonamiento estratégico: el llamado modelo de Jerarquías Cognitivas. Los resultados muestran una correlación entre niveles de

  18. Research on Bounded Rationality of Fuzzy Choice Functions

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    Xinlin Wu

    2014-01-01

    Full Text Available The rationality of a fuzzy choice function is a hot research topic in the study of fuzzy choice functions. In this paper, two common fuzzy sets are studied and analyzed in the framework of the Banerjee choice function. The complete rationality and bounded rationality of fuzzy choice functions are defined based on the two fuzzy sets. An assumption is presented to study the fuzzy choice function, and especially the fuzzy choice function with bounded rationality is studied combined with some rationality conditions. Results show that the fuzzy choice function with bounded rationality also satisfies some important rationality conditions, but not vice versa. The research gives supplements to the investigation in the framework of the Banerjee choice function.

  19. Rational points of bounded height on compactifications of anisotropic tori

    CERN Document Server

    Batyrev, V V; Batyrev, Victor V; Tschinkel, Yuri

    1994-01-01

    We investigate the analytic properties of the zeta-function associated with heights on equivariant compactifications of anisotropic tori over number fields. This allows to verify conjectures about the distribution of rational points of bounded height.

  20. The Economics of Bounded Rationality, Entrepreneurship and Institutional Evolution

    OpenAIRE

    Day, Richard H.

    1989-01-01

    Bounded rationality provides a fundamental economic explanation for non-rational modes of behavior. These non-rational modes underlie both the erratic perturbations of entrepreneurship and the systematic waves of diffusion they initiate which in turn guarantee that the economy operates out of equilibrium. Continuing adjustments out of equilibrium are made possible by financial intermediation. They imply asymmetric changes in individual welfare. The markets for entrepreneurship, ownership and ...

  1. From Bounded Rationality to Behavioral Economics

    OpenAIRE

    Massimo Egidi

    2005-01-01

    The paper provides an brief overview of the “state of the art” in the theory of rational decision making since the 1950’s, and focuses specially on the evolutionary justification of rationality. It is claimed that this justification, and more generally the economic methodology inherited from the Chicago school, becomes untenable once taking into account Kauffman’s Nk model, showing that if evolution it is based on trial-and-error search process, it leads generally to sub- optimal stable solut...

  2. Quantifying Bounded Rationality: Managerial Behaviour and the Smith Predictor

    OpenAIRE

    Riddalls, C.E.; Bennett, S.

    2001-01-01

    The concept of bounded rationality in decision making and research on its relegation to aggregate system dynamics is examined. By recasting one such example of a dynamic system, the Beer Game, as a Smith predictor control system is derived. A stability analysis is then employed to support the and qualify the assertion that the level of bounded rationality can adversely affect the aggregate dynamic behaviour of such supply chains. The analytical basis of these calculations enables the qualific...

  3. The bounded rationality of the educational choices

    Directory of Open Access Journals (Sweden)

    Simone Digennaro

    2015-04-01

    Full Text Available Nowadays, models adopted by the educational systems met with rigidities and doctrinal axioms that are limiting the efficacy of the interventions. This is due to a reduced capacity of adaptability to the reality. There is the tendency to apply a cage of false rationality, in which objectives, times, tools, etc. are defined with rigidity – often dogmatically supported – with the risk to level out the educational activity, without directly acting on the specific features of each individual and on the specific aspects that characterize one context from another. This is one of the main issue that the education is regarded to address today. It is also a topic that needs to be analysed since represents an important viaticum for lines of reasoning concerning the policies to be developed and the changes that might emerge in the educational praxis and in the long-term strategic and political decisions.

  4. Computational rationality: linking mechanism and behavior through bounded utility maximization.

    Science.gov (United States)

    Lewis, Richard L; Howes, Andrew; Singh, Satinder

    2014-04-01

    We propose a framework for including information-processing bounds in rational analyses. It is an application of bounded optimality (Russell & Subramanian, 1995) to the challenges of developing theories of mechanism and behavior. The framework is based on the idea that behaviors are generated by cognitive mechanisms that are adapted to the structure of not only the environment but also the mind and brain itself. We call the framework computational rationality to emphasize the incorporation of computational mechanism into the definition of rational action. Theories are specified as optimal program problems, defined by an adaptation environment, a bounded machine, and a utility function. Such theories yield different classes of explanation, depending on the extent to which they emphasize adaptation to bounds, and adaptation to some ecology that differs from the immediate local environment. We illustrate this variation with examples from three domains: visual attention in a linguistic task, manual response ordering, and reasoning. We explore the relation of this framework to existing "levels" approaches to explanation, and to other optimality-based modeling approaches. PMID:24648415

  5. Competition analysis of a triopoly game with bounded rationality

    International Nuclear Information System (INIS)

    Highlights: ► We model a Cournot triopoly game with three boundedly rational players. ► The equilibrium points of the model and their local stability are investigated. ► We study the dynamics of this model as varying the parameters. ► The stability of Nash equilibrium is lost and a chaotic behaviors occur. - Abstract: A dynamic Cournot game characterized by three boundedly rational players is modeled by three nonlinear difference equations. The stability of the equilibria of the discrete dynamical system is analyzed. As some parameters of the model are varied, the stability of Nash equilibrium is lost and a complex chaotic behavior occurs. Numerical simulation results show that complex dynamics, such as, bifurcations and chaos are displayed when the value of speed of adjustment is high. The global complexity analysis can help players to take some measures and avoid the collapse of the output dynamic competition game.

  6. Organizational Coordination and Costly Communication with Boundedly Rational Agents

    OpenAIRE

    Dietrichson, Jens; Jochem, Torsten

    2014-01-01

    How does costly communication affect organizational coordination? This paper develops a model of costly communication based on the weakest-link game and boundedly rational agents. Solving for the stochastically stable states, we find that communication increases the possibilities for efficient coordination compared to a setting where agents cannot communicate. But as agents face a trade-off between lowering the strategic uncertainty for the group and the costs of communication, the least effi...

  7. Getting Big Too Fast: Strategic Dynamics with Increasing Returns and Bounded Rationality

    OpenAIRE

    John D. Sterman; Rebecca Henderson; Eric D. Beinhocker; Lee I. Newman

    2007-01-01

    Neoclassical models of strategic behavior have yielded many insights into competitive behavior, despite the fact that they often rely on a number of assumptions--including instantaneous market clearing and perfect foresight--that have been called into question by a broad range of research. Researchers generally argue that these assumptions are "good enough" to predict an industry's probable equilibria, and that disequilibrium adjustments and bounded rationality have limited competitive implic...

  8. Comparable stocks, boundedly rational stock markets and IPO entry rates.

    Directory of Open Access Journals (Sweden)

    Jay Chok

    Full Text Available In this study, we examine how initial public offerings (IPO entry rates are affected when stock markets are boundedly rational and IPO firms infer information from their counterparts in the market. We hypothesize a curvilinear relationship between the number of comparable stocks and initial public offerings (IPO entry rates into the NASDAQ Stock Exchange. Furthermore, we argue that trading volume and changes in stock returns partially mediates the relationship between the number of comparable stocks and IPO entry rates. The statistical evidence provides strong support for the hypotheses.

  9. Bounded Rationality and the Diffusion of Modern Investment Treaties

    DEFF Research Database (Denmark)

    Skovgaard Poulsen, Lauge

    2014-01-01

    Given the considerable sovereignty costs involved, the adoption of modern investment treaties by practically all developing countries presents somewhat of a puzzle. Based on a review of leading explanations of investment treaty diffusion, the article advances a new theory using behavioral economics...... insights on cognitive heuristics. In line with recent work on policy diffusion, it suggests that a bounded rationality framework has considerable potential to explain why, and how, developing countries have adopted modern investment treaties. To illustrate the potential of this approach, the case of South...... Africa is studied in depth...

  10. A heterogeneous boundedly rational expectation model for housing market

    Institute of Scientific and Technical Information of China (English)

    Andrew Y. T. LEUNG; Jia-na XU; Wing Shum TSUI

    2009-01-01

    This research aims to test the housing price dynamics when considering heterogeneous boundedly rational expectations such as naive expectation, adaptive expectation and biased belief. The housing market is investigated as an evolutionary system with heterogeneous and competing expectations. The results show that the dynamics of the expected housing price varies substantially when heterogeneous expectations are considered together with some other endogenous factors. Simulation results explain some stylized phenomena such as equilibrium or oscillation, convergence or divergence, and over-shooting or under-shooting. Furthermore, the results suggest that variation of the proportion of groups of agents is basically dependent on the selected strategies. It also indicates that control policies should be chosen carefully in consistence with a unique real estate market during a unique period since certain parameter portfolio may increase or suppress oscillation.

  11. Bounding the number of rational places using Weierstrass semigroups

    DEFF Research Database (Denmark)

    Geil, Hans Olav; Matsumoto, Ryutaroh

    2007-01-01

    upper bound in terms of the generators of Lambda and q. Our bound is an improvement to Lewittes' bound in [6] which takes into account only the multiplicity of Lambda and q. From the new bound we derive significant improvements to Serre's upper bound in the cases q = 2, 3 and 4. We finally show that...

  12. Bounded Rationality, Emotions and Older Adult Decision Making: Not so Fast and yet so Frugal

    Science.gov (United States)

    Hanoch, Yaniv; Wood, Stacey; Rice, Thomas

    2007-01-01

    Herbert Simon's work on bounded rationality has had little impact on researchers studying older adults' decision making. This omission is surprising, as human constraints on computation and memory are exacerbated in older adults. The study of older adults' decision-making processes could benefit from employing a bounded rationality perspective,…

  13. (Un)Bounded Rationality in Decision Making and Game Theory – Back to Square One?

    OpenAIRE

    Güth,, A.; Kliemt

    2010-01-01

    Game and decision theory start from rather strong premises. Preferences, represented by utilities, beliefs represented by probabilities, common knowledge and symmetric rationality as background assumptions are treated as 'given.' A richer language enabling us to capture the process leading to what is 'given' seems superior to the stenography of decision making in terms of utility cum probability. However, similar to traditional rational choice modeling, boundedly rational choice modeling, as ...

  14. Randomness in the network inhibits cooperation based on the bounded rational collective altruistic decision

    International Nuclear Information System (INIS)

    Previous studies discussing cooperation employ the best decision that every player knows all information regarding the payoff matrix and selects the strategy of the highest payoff. Therefore, they do not discuss cooperation based on the altruistic decision with limited information (bounded rational altruistic decision). In addition, they do not cover the case where every player can submit his/her strategy several times in a match of the game. This paper is based on Ohdaira's reconsideration of the bounded rational altruistic decision, and also employs the framework of the prisoner's dilemma game (PDG) with sequential strategy. The distinction between this study and the Ohdaira's reconsideration is that the former covers the model of multiple groups, but the latter deals with the model of only two groups. Ohdaira's reconsideration shows that the bounded rational altruistic decision facilitates much more cooperation in the PDG with sequential strategy than Ohdaira and Terano's bounded rational second-best decision does. However, the detail of cooperation of multiple groups based on the bounded rational altruistic decision has not been resolved yet. This study, therefore, shows how randomness in the network composed of multiple groups affects the increase of the average frequency of mutual cooperation (cooperation between groups) based on the bounded rational altruistic decision of multiple groups. We also discuss the results of the model in comparison with related studies which employ the best decision. (paper)

  15. Computational and Game-Theoretic Approaches for Modeling Bounded Rationality

    NARCIS (Netherlands)

    L. Waltman (Ludo)

    2011-01-01

    textabstractThis thesis studies various computational and game-theoretic approaches to economic modeling. Unlike traditional approaches to economic modeling, the approaches studied in this thesis do not rely on the assumption that economic agents behave in a fully rational way. Instead, economic age

  16. Impacts of the driver's bounded rationality on the traffic running cost under the car-following model

    Science.gov (United States)

    Tang, Tie-Qiao; Luo, Xiao-Feng; Liu, Kai

    2016-09-01

    The driver's bounded rationality has significant influences on the micro driving behavior and researchers proposed some traffic flow models with the driver's bounded rationality. However, little effort has been made to explore the effects of the driver's bounded rationality on the trip cost. In this paper, we use our recently proposed car-following model to study the effects of the driver's bounded rationality on his running cost and the system's total cost under three traffic running costs. The numerical results show that considering the driver's bounded rationality will enhance his each running cost and the system's total cost under the three traffic running costs.

  17. Hodograph computation and bound estimation for rational B-spline curves

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    It is necessary to compute the derivative and estimate the bound of rational B-spline curves in design system, which has not been studied to date. To improve the function of computer aided design (CAD) system, and to enhance the efficiency of different algorithms of rational B-spline curves, the representation of scaled hodograph and bound of derivative magnitude of uniform planar rational B-spline curves are derived by applying Dir function, which indicates the direction of Cartesian vector between homogeneous points, discrete B-spline theory and the formula of translating the product into a summation of B-spline functions. As an application of the result above,upper bound of parametric distance between any two points in a uniform planar rational B-spline curve is further presented.

  18. Social Rationality as a Unified Model of Man (Including Bounded Rationality)

    OpenAIRE

    Lindenberg, Siegwart

    2001-01-01

    In 1957, Simon published a collection of his essays under the title of “Models of Man: Social and Rational”. In the preface, he explains the choice for this title: All of the essays “are concerned with laying foundations for a science of man that will comfortably accommodate his dual nature as a social and as a rational animal.” (p. vii) Observe that the title of the book refers to two models of man, one social and one rational. Throughout his life, Simon kept contributing to this science of ...

  19. Information Theory - The Bridge Connecting Bounded Rational Game Theory and Statistical Physics

    Science.gov (United States)

    Wolpert, David H.

    2005-01-01

    A long-running difficulty with conventional game theory has been how to modify it to accommodate the bounded rationality of all red-world players. A recurring issue in statistical physics is how best to approximate joint probability distributions with decoupled (and therefore far more tractable) distributions. This paper shows that the same information theoretic mathematical structure, known as Product Distribution (PD) theory, addresses both issues. In this, PD theory not only provides a principle formulation of bounded rationality and a set of new types of mean field theory in statistical physics; it also shows that those topics are fundamentally one and the same.

  20. A Reward-Maximizing Spiking Neuron as a Bounded Rational Decision Maker.

    Science.gov (United States)

    Leibfried, Felix; Braun, Daniel A

    2015-08-01

    Rate distortion theory describes how to communicate relevant information most efficiently over a channel with limited capacity. One of the many applications of rate distortion theory is bounded rational decision making, where decision makers are modeled as information channels that transform sensory input into motor output under the constraint that their channel capacity is limited. Such a bounded rational decision maker can be thought to optimize an objective function that trades off the decision maker's utility or cumulative reward against the information processing cost measured by the mutual information between sensory input and motor output. In this study, we interpret a spiking neuron as a bounded rational decision maker that aims to maximize its expected reward under the computational constraint that the mutual information between the neuron's input and output is upper bounded. This abstract computational constraint translates into a penalization of the deviation between the neuron's instantaneous and average firing behavior. We derive a synaptic weight update rule for such a rate distortion optimizing neuron and show in simulations that the neuron efficiently extracts reward-relevant information from the input by trading off its synaptic strengths against the collected reward. PMID:26079747

  1. Rational hybrid Monte Carlo algorithm for theories with unknown spectral bounds

    International Nuclear Information System (INIS)

    The Rational Hybrid Monte Carlo (RHMC) algorithm extends the Hybrid Monte Carlo algorithm for lattice QCD simulations to situations involving fractional powers of the determinant of the quadratic Dirac operator. This avoids the updating increment (dt) dependence of observables which plagues the Hybrid Molecular-dynamics (HMD) method. The RHMC algorithm uses rational approximations to fractional powers of the quadratic Dirac operator. Such approximations are only available when positive upper and lower bounds to the operator's spectrum are known. We apply the RHMC algorithm to simulations of 2 theories for which a positive lower spectral bound is unknown: lattice QCD with staggered quarks at finite isospin chemical potential and lattice QCD with massless staggered quarks and chiral 4-fermion interactions (χQCD). A choice of lower bound is made in each case, and the properties of the RHMC simulations these define are studied. Justification of our choices of lower bounds is made by comparing measurements with those from HMD simulations, and by comparing different choices of lower bounds

  2. Herbert Simon: bounded rationality y teoría de las organizaciones

    OpenAIRE

    Estrada, Fernando

    2012-01-01

    This article evaluates Herbert A. Simon’s contribution to organization theory, placing special emphasis on the criterion of bounded rationality. Simon’s criticism of the orthodox version of organizational bureaucracy is interpreted and his analysis is extended to institutional economics. One of Simon’s main achievements in organizational theory consisted of analytically evaluating the psychology of individual and collective behaviour, thereby opening up the way for future investigation by D. ...

  3. Understanding Strategic Adaptation in Dual-Task Situations as Cognitively Bounded Rational Behavior

    OpenAIRE

    Janssen, C. P.

    2012-01-01

    In this thesis I explored when people interleave attention in dual-task settings. The hypothesis is that people try to perform in a cognitively bounded rational way. Performance is limited by constraints that come from the task environment and cognition. If, given these constraints, multiple strategies for interleaving tasks are available, then people will interleave tasks in a way that aligns with their local priority objective (Chapter 3), or which maximizes the value of an objective payoff...

  4. Stability analysis in a Cournot duopoly with managerial sales delegation and bounded rationality

    OpenAIRE

    Fanti, Luciano; Gori, Luca

    2011-01-01

    The present study analyses the dynamics of a Cournot duopoly with managerial sales delegation and bounded rational players. We find that when firms’ owners hire a manager and delegate the output decisions to him, the unique Cournot-Nash equilibrium is more likely to be destabilised (through a flip bifurcation) than when firms maximise profits. Moreover, highly periodicity and deterministic chaos can also occur as the managers’ bonus increases.

  5. ‘Milk is Milk’: Organic Dairy Adoption Decisions and Bounded Rationality

    Directory of Open Access Journals (Sweden)

    Caroline C. Brock

    2013-12-01

    Full Text Available Bounded rationality is an especially appropriate framework for organic dairy adoption decisions as it recognizes internal and external constraints which are critical in understanding complex farm decision making. Farmers use of, and access to, information is examined using interview data gathered from organic, conventional, managed graziers, and Amish dairy farmers in Southwestern Wisconsin at a time when organic milk prices offered a 50% premium over conventional prices. Focusing on certain aspects and impressions of organic dairy, such as the sentiment that “milk is milk”, may lead to information satisficing where farmers do not take full advantage of the information available to them. Organic farmer interviews reveal the challenges they faced with bounded rationality constraints and how they countered these challenges with the help of social networks, as well as how situational factors such as economic and health crises may have motivated them to adopt organic dairy. The interview data from organic and conventional farmers alike also reveals how many conventional dairy farmers utilized information strategies which did not fully consider the pros and cons of the organic system. A bounded rationality framework could enlighten policy makers and educators as they tailor sustainable agricultural policy design and information dissemination strategies to serve the diversity of farmers on the landscape.

  6. The use of artificially intelligent agents with bounded rationality in the study of economic markets

    Energy Technology Data Exchange (ETDEWEB)

    Rajan, V.; Slagle, J.R. [Univ. of Minnesota, Minneapolis, MN (United States)

    1996-12-31

    The concepts of {open_quote}knowledge{close_quote} and {open_quote}rationality{close_quote} are of central importance to fields of science that are interested in human behavior and learning, such as artificial intelligence, economics, and psychology. The similarity between artificial intelligence and economics - both are concerned with intelligent thought, rational behavior, and the use and acquisition of knowledge - has led to the use of economic models as a paradigm for solving problems in distributed artificial intelligence (DAI) and multi agent systems (MAS). What we propose is the opposite; the use of artificial intelligence in the study of economic markets. Over the centuries various theories of market behavior have been advanced. The prevailing theory holds that an asset`s current price converges to the risk adjusted value of the rationally expected dividend stream. While this rational expectations model holds in equilibrium or near-equilibrium conditions, it does not sufficiently explain conditions of market disequilibrium. An example of market disequilibrium is the phenomenon of a speculative bubble. We present an example of using artificially intelligent agents with bounded rationality in the study of speculative bubbles.

  7. Advances in understanding strategic behaviour game theory, experiments and bounded rationality

    CERN Document Server

    Huck, Steffen

    2004-01-01

    The first ultimatum game, conducted by Werner Güth in the late 1970s, marks a crucial point in the history of modern economics-suddenly game theory lost its innocence and there was a chasm-between the beauty and elegance of the theory on one hand and the dour facts of behaviour on the other. Since then, the economics literature has slowly started filling this gap. Evolutionary game theory, preference evolution, learning models, models of bounded rationality with and without optimization, and, of course, more and more systematic experimental evidence-all these approaches flourished, competing w

  8. Pexeso ("Concentration game") as an arbiter of bounded-rationality models

    Czech Academy of Sciences Publication Activity Database

    Kuběna, Aleš Antonín

    České Budějovice : University of South Bohemia, 2010 - (Houda, M.; Friebelová, J.), s. 337-380 ISBN 978-80-7394-218-2. [28-th International Conference on Mathematical Methods in Economics. České Budějovice (CZ), 08.09.2010-10.09.2010] R&D Projects: GA ČR GD402/09/H045 Institutional research plan: CEZ:AV0Z10750506 Keywords : Concentration game * pexeso * perfect players Subject RIV: AH - Economics http://library.utia.cas.cz/separaty/2010/E/kubena-pexeso (concentration game) as an arbiter of bounded-rationality models.pdf

  9. Rational Adaptation under Task and Processing Constraints: Implications for Testing Theories of Cognition and Action

    Science.gov (United States)

    Howes, Andrew; Lewis, Richard L.; Vera, Alonso

    2009-01-01

    The authors assume that individuals adapt rationally to a utility function given constraints imposed by their cognitive architecture and the local task environment. This assumption underlies a new approach to modeling and understanding cognition--cognitively bounded rational analysis--that sharpens the predictive acuity of general, integrated…

  10. Analysis of a nonlinear mixed Cournot game with boundedly rational players

    International Nuclear Information System (INIS)

    Highlights: • A dynamic nonlinear mixed Cournot game with a semipublic firm and a private firm is developed. • The stability of the Nash equilibrium and complex dynamic features are discussed. • The production adjustment costs are proved to inhibit the stability of the Nash equilibrium sometimes. -- Abstract: In this paper, we consider a creative case where one semipublic firm endeavors to maximize the weighted average on social welfare and its own profit while the other private firm only intends to maximize its own profit, so we bring in a dynamic nonlinear mixed Cournot model with bounded rationality. The locally asymptotical stability of the unique Nash equilibrium is also investigated and complex dynamic features including period doubling bifurcations, strange attractors and chaotic phenomena are also discussed. Furthermore, by introducing production adjustment costs into the model, we will show that sometimes they violate the locally asymptotical stability of the Nash equilibrium, compared to the well-known results under the best response dynamic when these costs act as a stabilizing factor

  11. An Explication of Rational Suicide: Its Definitions, Implications, and Complications.

    Science.gov (United States)

    Maltsberger, John T.

    1998-01-01

    Logical analysis of arguments in favor of rational suicide reveals 11 commonly encountered premises. These premises are listed, analyzed, and discussed. The arguments of the rational suicide literature are criticized on historical and philosophical grounds. Consensus-based reasonableness is found to provide an insubstantial base for social policy.…

  12. Pharmacodynamics of nicotine: implications for rational treatment of nicotine addiction.

    Science.gov (United States)

    Benowitz, N L

    1991-05-01

    Rational treatment of the pharmacologic aspects of tobacco addiction includes nicotine substitution therapy. Understanding the pharmacodynamics of nicotine and its role in the addiction process provides a basis for rational therapeutic intervention. Pharmacodynamic considerations are discussed in relation to the elements of smoking cessation therapy: setting objectives, selecting appropriate medication and dosing form, selecting the optimal doses and dosage regimens, assessing therapeutic outcome, and adjusting therapy to optimize benefits and minimize risks. PMID:1859911

  13. Refugee Quota Trading within the Context of EU-ENP Cooperation: Rational, Bounded Rational and Ethical Critiques

    Directory of Open Access Journals (Sweden)

    Mollie Gerver

    2013-02-01

    Full Text Available In 1997 Peter Schuck proposed a ‘refugee quota trading’ mechanism, whereby countries voluntarily form a union, each country accepting a quota of refugees and able to buy and sell the quota to other states within and even outside of the union. Today, the EU arguably has a de facto cash transfer mechanism both within the EU and between the EU and European Neighbourhood Policy countries. This article explores the question of refugee quota trading, explaining why current EU policy fails to increase refugee protection. Throughout the critique, states are treated either as rational actors or actors with present-preference bias, the latter largely ignored in current discussions on international refugee ‘burden sharing’. In addition, the ethics of refugee quota trading is presented using arguments distinct from that of Anker et al. (1998 who argue that refugee quota trading creates a ‘commodification’ of refugees. One could argue that refugees’ protection is being commodified, not refugees themselves. However, when states are provided funds not to deport refugees, this can be a type of reward for not taking an action that states ought to follow regardless of the reward. Just as there are non-utilitarian reasons not to rely on rewards alone for lowering the crime rates for heinous crimes within states, there may be non-utilitarian arguments against refugee quota trading.

  14. Econometric Explorations on Bounded Rationality: The Case of Job Changing Behavior

    OpenAIRE

    Contini, Bruno; Morini, Matteo

    2007-01-01

    In this paper we question the hypothesis of full rationality in the context of job changing behaviour, via simple econometric explorations on microdata drawn from WHIP (Worker Histories Italian Panel). A rational outcome of the job matching process implies a positive tradeoff between future wages and risk-on-the-job. The main result of this paper is that no “rational” tradeoff is observable after controlling for a variety of possible shifters. However, if we control for individual characteris...

  15. Mild and rational synthesis of palladium complexes comprising C(4)-bound N-heterocyclic carbenes

    OpenAIRE

    Kluser, Evelyne; Neels, Antonia; Albrecht, Martin

    2007-01-01

    Oxidative addition of pyridyl-functionalised 4-iodoimidazolium salts to palladium(0) gives catalytically active complexes in which the N-heterocyclic carbene is bound to the palladium(II) centre in a non-classical bonding mode via C(4).

  16. 基于有限理性智能体的生态经济模型%The Ecological Economic Model Based on Bounded Rational Agents

    Institute of Scientific and Technical Information of China (English)

    姜继娇

    2005-01-01

    From the view of hominine bounded rationalities, this paper analyzes the important relationships between ecology and economics with behavioral finance. With a different focus, this paper adopts a new conceptualization of stock to show how this conceptualization leads to a new measure of the interaction between ecology and economics, based on bounded rational agents. The hierarchical structure of ecological economic system is described with a multi-agent simulation program. This paper also develops an ecological economic model, in which behavioral finance theories are applied to simulating the dynamics system. With the model, this paper confirms that macro-level indicators of sustainability are predictably influenced by behaviors of bounded rational agents at the micro-level. We discuss the significance of these findings in order to better understand the ecological-economic system based on behavioral finance.

  17. Oligopoly games with nonlinear demand and cost functions: Two boundedly rational adjustment processes

    International Nuclear Information System (INIS)

    We consider a Cournot oligopoly game, where firms produce an homogenous good and the demand and cost functions are nonlinear. These features make the classical best reply solution difficult to be obtained, even if players have full information about their environment. We propose two different kinds of repeated games based on a lower degree of rationality of the firms, on a reduced information set and reduced computational capabilities. The first adjustment mechanism is called 'Local Monopolistic Approximation' (LMA). First firms get the correct local estimate of the demand function and then they use such estimate in a linear approximation of the demand function where the effects of the competitors' outputs are ignored. On the basis of this subjective demand function they solve their profit maximization problem. By using the second adjustment process, that belongs to a class of adaptive mechanisms known in the literature as 'Gradient Dynamics' (GD), firms do not solve any optimization problem, but they adjust their production in the direction indicated by their (correct) estimate of the marginal profit. Both these repeated games may converge to a Cournot-Nash equilibrium, i.e. to the equilibrium of the best reply dynamics. We compare the properties of the two different dynamical systems that describe the time evolution of the oligopoly games under the two adjustment mechanisms, and we analyze the conditions that lead to non-convergence and complex dynamic behaviors. The paper extends the results of other authors that consider similar adjustment processes assuming linear cost functions or linear demand functions

  18. Oligopoly games with nonlinear demand and cost functions: Two boundedly rational adjustment processes

    Energy Technology Data Exchange (ETDEWEB)

    Naimzada, Ahmad K. [Department of Economics, University of Milan, Bicocca (Italy)]. E-mail: ahmad.naimzada@unimib.it; Sbragia, Lucia [Department of Economics, University of Urbino (Italy)]. E-mail: l.sbragia@uniurb.it

    2006-08-15

    We consider a Cournot oligopoly game, where firms produce an homogenous good and the demand and cost functions are nonlinear. These features make the classical best reply solution difficult to be obtained, even if players have full information about their environment. We propose two different kinds of repeated games based on a lower degree of rationality of the firms, on a reduced information set and reduced computational capabilities. The first adjustment mechanism is called 'Local Monopolistic Approximation' (LMA). First firms get the correct local estimate of the demand function and then they use such estimate in a linear approximation of the demand function where the effects of the competitors' outputs are ignored. On the basis of this subjective demand function they solve their profit maximization problem. By using the second adjustment process, that belongs to a class of adaptive mechanisms known in the literature as 'Gradient Dynamics' (GD), firms do not solve any optimization problem, but they adjust their production in the direction indicated by their (correct) estimate of the marginal profit. Both these repeated games may converge to a Cournot-Nash equilibrium, i.e. to the equilibrium of the best reply dynamics. We compare the properties of the two different dynamical systems that describe the time evolution of the oligopoly games under the two adjustment mechanisms, and we analyze the conditions that lead to non-convergence and complex dynamic behaviors. The paper extends the results of other authors that consider similar adjustment processes assuming linear cost functions or linear demand functions.

  19. Boundedly rational credit cycles

    OpenAIRE

    S??ez, Mar??a

    1996-01-01

    We propose an evolutionary model of a credit market. We show that the economy exhibits credit cycles. The model predicts dynamics which are consistent with some evidence about the Great Depression. Real shocks trigger episodes of credit--crunch which are observed in the process of adjustment towards the post shock equilibrium.

  20. Modified Lyth bound and implications of BICEP2 results

    CERN Document Server

    Gao, Qing; Li, Tianjun

    2015-01-01

    To reconcile the BICEP2 measurement on the tensor-to-scalar ratio $r$ with Planck constraint, a large negative running of scalar spectral index $n_s$ is needed. So the inflationary observable such as $n_s$ should be expanded at least to the second-order slow-roll parameters for single-field inflationary models. The large value of $r$ and the Lyth bound indicate that it is impossible to obtain the sub-Planckian excursion for the inflaton. However, we derive an absolutely minimal bound $\\Delta\\phi/M_{\\rm Pl}>\\sqrt{r/2}$ on the inflaton excursion for single-field inflationary models, which can be applied to non-slow-roll inflationary models as well. This bound excludes the possibility of the small-field inflation with $\\Delta\\phi<0.1 M_{\\rm Pl}$ if the BICEP2 result on $r$ stands and it opens the window of sub-Planckian excursion with $\\Delta\\phibound requires $r<0.02$. Usi...

  1. Living with a carbon allowance: The experiences of Carbon Rationing Action Groups and implications for policy

    International Nuclear Information System (INIS)

    Carbon Rationing Action Groups (CRAGs) are grassroots voluntary groups of citizens concerned about climate change, who set themselves a carbon allowance each year and provide support to members seeking to reduce their direct carbon emissions from household energy use and personal transport. Some groups have a financial penalty for carbon emitted in excess of the ration, and systems whereby under-emitters are rewarded using the monies collected from over-emitters. CRAGs therefore operate the nearest scheme in existence to the proposed policy of Personal Carbon Trading (PCT). This paper reports the findings of a study of the opinions and experiences of individuals involved in CRAGs (‘CRAGgers’). In general, interviewees have made significant behavioural changes and emissions reductions, but many would be unwilling to sell spare carbon allowances within a national PCT system. The choices made by CRAGgers with respect to the design and operation of their ‘carbon accounting’, their experiences of reducing fossil fuel energy use, and their views on personal carbon trading at CRAG and national level are discussed. Some possible implications for PCT and other policies are considered, as well as the limitations of CRAGs in informing an understanding of the potential impacts and operation of PCT. - Highlights: ► Reports opinions and experiences of members of Carbon Rationing Action Groups (CRAGs). ► Many interviewees have made significant reductions to their carbon footprint. ► CRAGs offer insights into individuals' experiences of living with a carbon allowance. ► Most CRAGs involve highly motivated individuals and avoid trading. ► They nonetheless offer some insights into Personal Carbon Trading and other policies.

  2. Surface Reactivity in Tropical Highly Weathered Soils and Implications for Rational Soil Management

    Institute of Scientific and Technical Information of China (English)

    R. MOREAU; J. PETARD

    2004-01-01

    Highly weathered soils are distributed in the humid and wet-dry tropics, as well as in the humid subtropics. As a result of strong weathering, these soils are characterized by low activity clays, which develop variable surface charge and related specific properties. Surface reactions regarding base exchange and soil acidification, heavy metal sorption and mobility, and phosphorus sorption and availability of the tropical highly weathered soils are reviewed in this paper.Factors controlling surface reactivity towards cations and anions, including ion exchange and specific adsorption processes, are discussed with consideration on practical implications for rational management of these soils. Organic matter content and pH value are major basic factors that should be controlled through appropriate agricultural practices, in order to optimise favorable effects of colloid surface properties on soil fertility and environmental quality.

  3. From the human capital defined as "homo oeconomicus rationalis" to that of the rationally bounded and oportunistic "homo contractualis". An institutionalist approach

    Directory of Open Access Journals (Sweden)

    Ion POHOATA

    2008-05-01

    Full Text Available The rationality (its presence or its absence of the business, be it producer or consumer, has been a constant preoccupation of all those who dedicated their energy and talent on the sinuous road of the history of economic thinking. Without rational behaviour it was inconceivable to determine a development path. From this point of view the position of the great schools of thought is based, essentially, on two main approaches. The classics and the neoclassics had in mind the perfectly rational and well-informed individual. In reply, the institutional economy, in its old or new form (NIE, opposes to homo oeconomicus rationalis a narrow-minded and insufficiently informed homo contractualis. The consequences of this re-evaluation of the basics of the business’s potencies on the physiognomy of the theoretical approach and also on the results of practical actions are significant. Those linked to the bounded rationality hypothesis, an important operating concept in the analytical structures of NIE, may trigger debates on the theoretical basis of standard economics.

  4. Departure Time Choice Behavior Based on Bounded Rationality%有限理性下个体出发时间选择行为研究

    Institute of Scientific and Technical Information of China (English)

    栾琨; 傅忠宁; 隽志才

    2016-01-01

    Subject to such limitations as cognitive ability and logical reasoning ability, it is difficult for individual to be perfectly rational in the travel decision-making process. Taking departure time choice as an example, key behavior factors such as spatial knowledge acquisition, learning, cognition update and solution search are introduced. The theoretical framework of travel decision-making process is built based on bounded rationality. Departure time behavioral intention survey program is designed by integration of RP and SP survey methods. Individual’s knowledge representation is studied, and cognitive update is completed by using Bayesian learning theory. Functions of search cost and search gain are defined. By using survey data, departure time heuristic search rules and decision rules are derived based on PART and RIPPER algorithm separately. The results show that there exist perception threshold in individual’s departure time choice behavior under bounded rationality, rather than seeking global optimal solution.%个体受限于认知能力和逻辑推理能力的限制,在出行决策过程中很难做到完全理性。本文以出发时间选择为例,在有限理性行为假设基础上,引入空间知识获取、学习及认知更新和方案搜索等关键行为要素,构建有限理性下的出行决策过程理论框架。融合RP和SP调查方法,设计出发时间选择行为意向调查方案。研究个体知识的表达方式,应用贝叶斯学习理论完成认知更新。定义搜索成本和收益函数,利用调查数据分别提取基于PART和RIPPER算法的出发时间启发式搜索规则和决策规则。结果表明,有限理性下个体出发时间选择行为存在感知阈值,而并非寻求全局最优解。

  5. Uncertainty and Bounded Rationality: An Empirical Study in Financial Sector Incerteza e Racionalidade Limitada: Um Estudo Empírico no Setor Financeiro

    Directory of Open Access Journals (Sweden)

    Adilson Aderito da Silva

    2012-06-01

    Full Text Available The levels of uncertainty perceived by managers as having the perspective of the theoretical support of the Information Uncertainty, focusing on the multidimensional approach proposed by Milliken (1987, which supports the existence of three types of uncertainty: uncertainty of state, uncertainty effect and response uncertainty. The levels of rationality of managers were estimated to construct a second order from the uncertainties of effect and response uncertainty, with the theoretical support in the definitions of the concept of bounded rationality proposed by Simon (1957. The data collected from the 118 employees of the banking sector in the State of São Paulo were analyzed using Structural Equation Modeling with the Software Smart PLS. The results indicated a significant influence of the state uncertainty on the  level of rationality of managers and bring important methodological and conceptual contributions to the advancement of studies on the subject of uncertainty in decision makingEsta pesquisa foi desenvolvida com o objetivo de avaliar o impacto da incerteza percebida no ambiente sobre os níveis de racionalidade dos gestores do setor financeiro. Para tal, foram estimados os níveis de incerteza percebidos pelos gestores tendo como suporte teórico a perspectiva da Incerteza da Informação, com foco na abordagem multidimensional proposta por Milliken (1987, que defende a existência de três tipos de incerteza: incerteza de estado, incerteza de efeito e incerteza de resposta. Os níveis de racionalidade dos gestores foram estimados como um construto de segunda ordem a partir das incertezas de efeito e da incerteza de resposta, com o suporte teórico nas definições do conceito de racionalidade limitada propostas  por Simon (1957.  Os dados coletados junto aos 118 funcionários do setor bancário no Estado de São Paulo foram analisados por meio de Modelagem por Equações Estruturais com o Software Smart PLS. Os resultados

  6. Computational Intelligence Determines Effective Rationality

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Rationality is a fundamental concept in economics. Most researchers will accept that human beings are not fully rational.Herbert Simon suggested that we are "bounded rational". However, it is very difficult to quantify "bounded rationality", and therefore it is difficult to pinpoint its impact to all those economic theories that depend on the assumption of full rationality. Ariel Rubinstein proposed to model bounded rationality by explicitly specifying the decision makers' decision-making procedures. This paper takes a computational point of view to Rubinstein's approach. From a computational point of view, decision procedures can be encoded in algorithms and heuristics. We argue that, everything else being equal, the effective rationality of an agent is determined by its computational power - we refer to this as the computational intelligence determines effective rationality (CIDER) theory. This is not an attempt to propose a unifying definition of bounded rationality. It is merely a proposal of a computational point of view of bounded rationality. This way of interpreting bounded rationality enables us to (computationally) reason about economic systems when the full rationality assumption is relaxed.

  7. Rational design of highly potent HIV-1 fusion inhibitory proteins: Implication for developing antiviral therapeutics

    International Nuclear Information System (INIS)

    Recombinant protein containing one heptad-repeat 1 (HR1) segment and one HR2 segment of the HIV-1 gp41 (HR1-HR2) has been shown to fold into thermally stable six-helix bundle, representing the fusogenic core of gp41. In this study, we have used the fusogenic core as a scaffold to design HIV-1 fusion inhibitory proteins by linking another HR1 to the C terminus of HR1-HR2 (HR121) or additional HR2 to the N terminus of HR1-HR2 (HR212). Both recombinant proteins could be abundantly and solubly expressed and easily purified, exhibiting high stability and potent inhibitory activity on HIV-1 fusion with IC50 values of 16.2 ± 2.8 and 2.8 ± 0.63 nM, respectively. These suggest that these rationally designed proteins can be further developed as novel anti-HIV-1 therapeutics

  8. 农村大学生就业有限理性的原因及程度探析%Analysis of Causes and Level of Bounded Rationality of Rural College Students' Employment

    Institute of Scientific and Technical Information of China (English)

    章思; 陈准

    2011-01-01

    从有限理性角度探析了农村大学生就业行为,提出了相较之于城镇大学生的农村大学生有限理性程度的度量方法.结果表明,影响农村大学生就业有限理性的认知因素主要有认知广度和认知深度,而环境因素主要有体制因素、经济因素和家庭因素.%This paper explored the employment behavior of rural college students from the perspective of bounded rationality and proposed a method to measure the level of bounded rationality for rural college student in comparison with urban college students.The results showed that the cognitive factors, which impact bounded rationality of employment of rural college students, mainly include breadth and depth of cognizance, and environmental factors mainly include institutional, economic and family factors.

  9. Determinants of Actor Rationality

    DEFF Research Database (Denmark)

    Ellegaard, Chris

    Industrial companies must exercise influence on their suppliers (or supplier actors). Actor rationality is a central theme connected to this management task. In this article, relevant literature is studied with the purpose of shedding light on determinants of actor rationality. Two buyer......-supplier relations are investigated in a multiple case study, leading to the proposal of various additional factors that determine and shape actor rationality. Moreover a conceptual model of rationality determinants in the buyer-supplier relation is proposed, a model that may help supply managers analyse and...... understand actor rationalities. Finally managerial implications are discussed....

  10. Risk and Rationality in Adolescent Decision Making: Implications for Theory, Practice, and Public Policy.

    Science.gov (United States)

    Reyna, Valerie F; Farley, Frank

    2006-09-01

    Crime, smoking, drug use, alcoholism, reckless driving, and many other unhealthy patterns of behavior that play out over a lifetime often debut during adolescence. Avoiding risks or buying time can set a different lifetime pattern. Changing unhealthy behaviors in adolescence would have a broad impact on society, reducing the burdens of disease, injury, human suffering, and associated economic costs. Any program designed to prevent or change such risky behaviors should be founded on a clear idea of what is normative (what behaviors, ideally, should the program foster?), descriptive (how are adolescents making decisions in the absence of the program?), and prescriptive (which practices can realistically move adolescent decisions closer to the normative ideal?). Normatively, decision processes should be evaluated for coherence (is the thinking process nonsensical, illogical, or self-contradictory?) and correspondence (are the outcomes of the decisions positive?). Behaviors that promote positive physical and mental health outcomes in modern society can be at odds with those selected for by evolution (e.g., early procreation). Healthy behaviors may also conflict with a decision maker's goals. Adolescents' goals are more likely to maximize immediate pleasure, and strict decision analysis implies that many kinds of unhealthy behavior, such as drinking and drug use, could be deemed rational. However, based on data showing developmental changes in goals, it is important for policy to promote positive long-term outcomes rather than adolescents' short-term goals. Developmental data also suggest that greater risk aversion is generally adaptive, and that decision processes that support this aversion are more advanced than those that support risk taking. A key question is whether adolescents are developmentally competent to make decisions about risks. In principle, barring temptations with high rewards and individual differences that reduce self-control (i.e., under ideal

  11. 有限理性对劳动力流动决策的影响分析%An analysis of the influence of bounded rationality on labor flow decision-making

    Institute of Scientific and Technical Information of China (English)

    袁乐平; 王立软; 李萍

    2012-01-01

      经典劳动力流动理论以完全理性为假设前提,难以准确分析当前我国存在的“盲流”“回流”等劳动力流动“异象”问题。通过对劳动力流动现状与传统理论之间的冲突进行分析,得出造成劳动力流动异象的原因在于劳动者的有限理性。劳动者的有限理性造成预期成本和收益与实际不符,进而影响劳动力的流动决策,当预期净收益现值与实际净收益现值异号时,劳动力流动“异象”便会发生。%  The classical labor flow theory is based on the assumption of perfect rationality, which cannot acutely analyze the heteromorphism problem in present Chinese labor flow such as “unemployed migrant people” and labor backflow. The theory deviates from the reality. Through the analysis of conflict between current situation of labor flow and traditional theory, we conclude that bounded rationality leads to heteromorphism problem. So, we analyze the process of generation of labor flow decision-making from the perspective of bounded rationality. The bounded rationality cause the expected costs and benefits do not match with the actual, which would affect labors’ decision-making for flow. Labor flow heteromorphism occurs when there is an opposite sign between the present value of expected net income and the present value of actual net income.

  12. A proposal to rationalize within-species plant virus nomenclature: benefits and implications of inaction.

    Science.gov (United States)

    Jones, Roger A C; Kehoe, Monica A

    2016-07-01

    Current approaches used to name within-species, plant virus phylogenetic groups are often misleading and illogical. They involve names based on biological properties, sequence differences and geographical, country or place-association designations, or any combination of these. This type of nomenclature is becoming increasingly unsustainable as numbers of sequences of the same virus from new host species and different parts of the world increase. Moreover, this increase is accelerating as world trade and agriculture expand, and climate change progresses. Serious consequences for virus research and disease management might arise from incorrect assumptions made when current within-species phylogenetic group names incorrectly identify properties of group members. This could result in development of molecular tools that incorrectly target dangerous virus strains, potentially leading to unjustified impediments to international trade or failure to prevent such strains being introduced to countries, regions or continents formerly free of them. Dangerous strains might be missed or misdiagnosed by diagnostic laboratories and monitoring programs, and new cultivars with incorrect strain-specific resistances released. Incorrect deductions are possible during phylogenetic analysis of plant virus sequences and errors from strain misidentification during molecular and biological virus research activities. A nomenclature system for within-species plant virus phylogenetic group names is needed which avoids such problems. We suggest replacing all other naming approaches with Latinized numerals, restricting biologically based names only to biological strains and removing geographically based names altogether. Our recommendations have implications for biosecurity authorities, diagnostic laboratories, disease-management programs, plant breeders and researchers. PMID:27101071

  13. 有限理性模型在游戏智能决策中的研究与应用%Research and application of bounded rationality model used in game intelligent decision-making

    Institute of Scientific and Technical Information of China (English)

    周强; 高春鸣; 孟志刚

    2011-01-01

    为了让游戏NPC能够学习和模拟玩家在游戏中的策略和行为方式,在基于模型的智能决策方法基础上,结合行为决策理论中的有限理性模型提出了一种新的游戏智能方法.该方法分别从有限理性模型的两个核心原则——有限理性和满意准则来改进过去的方法在感知和决策过程中所面对的问题,从而使得游戏NPC行为决策方式更加人性化.最后,通过在Starcraft平台上与其他方法的对抗性实验来进一步验证该方法的优势.%This article presented a novel game intelligent decision-making method to make game NPC( non-player character) learn and simulate strategies and behavioral pattern which the players used in the video game. This method improved the mod-el-based method, and introduced the bounded rationality model of the behavioural decision theory as the basic decision-making model. So that it would drawback the problems confronted with the past methods in the perception and decision-making process from two aspects-bounded rationality and satisfactory criterion, which was the core of the bounded rationality model. Finally, the advantages of this method were verified by the experiments on the platform of Starcraft.

  14. A Lower Bound on Neutrino Mass And Its Implication on the Z-Burst Scenario

    Energy Technology Data Exchange (ETDEWEB)

    Lai, Kwang-Chang; /Taiwan, Natl. Taiwan U.; Chen, Pisin; /KIPAC, Menlo Park

    2006-01-11

    We show that the cascade limit on ultra high energy cosmic neutrino (UHEC/nu) flux imposes a lower bound on the neutrino mass provided that super-GZK events of ultra high energy cosmic rays (UHECRs) are produced from Z-bursts. Based on the data from HiRes and AGASA, the obtained neutrino mass lower bound violates its existing cosmological upper bound. We conclude that the Z-burst cannot be the dominant source for the observed super-GZK UHECR events. This is consistent with the recent ANITA-lite data.

  15. Lessons from Learning to Have Rational Expectations

    OpenAIRE

    Lindh, Thomas

    1989-01-01

    This paper reviews a growing literature investigating how economic agents may learn rational expectations. Fully rational learning requires implausible initial information assumptions, therefore some form of bounded rationality has come into focus. Such learning models often converge to rational expectations equilibria within certain bounds. Convergence analysis has been much simplified by methods from adaptive control theory. Learning stability as a correspondence principle show some promise...

  16. The bounding-surfaces record of a barrier spit from Huangqihai Lake, North China: implications for coastal barrier boundary hierarchy

    Science.gov (United States)

    Shan, Xin; Yu, Xinghe; Clift, Peter D.; Wang, Tianyi; Tan, Chengpeng; Jin, Lina

    2016-09-01

    Ground-penetrating radar and trenching studies of a barrier spit on the north shore of Huangqihai Lake were made, that reveal important implications for the coastal washover barrier boundary hierarchy and interpretations of this depositional record. A four-fold hierarchy bounding-surface model, representing different levels of impact and genesis, is defined. Each level of the hierarchy is enclosed by a distinct kind of surface characterized by different ground-penetrating radar reflection features, sedimentary characteristics (color, grain size, sorting, rounding and sedimentary structures) and origin. We suggest that this hierarchical model can be applied to any coastal washover barrier deposits.

  17. Limited rationality and strategic interaction

    DEFF Research Database (Denmark)

    Fehr, Ernst; Tyran, Jean-Robert

    2008-01-01

    Much evidence suggests that people are heterogeneous with regard to their abilities to make rational, forward-looking decisions. This raises the question as to when the rational types are decisive for aggregate outcomes and when the boundedly rational types shape aggregate results. We examine this...... question in the context of a long-standing and important economic problem: the adjustment of nominal prices after an anticipated monetary shock. Our experiments suggest that two types of bounded rationality-money illusion and anchoring-are important behavioral forces behind nominal inertia. However......, depending on the strategic environment, bounded rationality has vastly different effects on aggregate price adjustment. If agents' actions are strategic substitutes, adjustment to the new equilibrium is extremely quick, whereas under strategic complementarity, adjustment is both very slow and associated...

  18. A bound on the charm chromo-EDM and its implications

    International Nuclear Information System (INIS)

    We derive bounds on the electric and chromo-electric dipole moments of the charm quark. The second one turns out to be particularly strong, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector, like flavour alignment and Generic U(2)3. In particular we show how the bounds coming from the charm and up CEDMs constrain the size of new physics contributions to direct flavour violation in D decays. We also specialize our analysis to the cases of Supersymmetry with split families and composite Higgs models. The results exposed in this paper motivate both an increase in experimental sensitivity to fundamental hadronic dipoles, and a further exploration of the SM contribution to flavour violating D decays

  19. Research on Risk Behavior for the Strategic Decision-making of Entrepreneur Based on Bounded Rationality%基于有限理性的企业家战略决策风险行为研究

    Institute of Scientific and Technical Information of China (English)

    任静; 刘升福

    2014-01-01

    企业家认知的有限性决定了企业家在有限理性的状态下进行战略决策。基于行为经济学和决策行为理论,研究有限理性下企业家战略决策风险行为及其影响因素。通过建立模型和实证研究来探讨企业家战略决策风险行为及其影响因素对战略决策风险行为的影响,从而为企业家战略决策风险行为管理提供依据。%The limitation of Entrepreneurs′cognition decides that entrepreneurs make strategic decisions under the limited rational state.The paper,based on the theory of behavioral economics and the decision-making behavior,studies the entrepreneur strategic decision deviation behavior based on bounded rationality and its influencing factors.Through the questionnaire,interviews and the empirical research,the paper explores the various influencing factors of entrepreneur strategic decision-making risk behavior influence on strategic decision-making risk behaviors,so as to provide the basis for entrepreneurs strategic decision-making risk behavior management.

  20. A non-standard approach to a market with boundedly rational consumers and strategic firms. Part I: A microfoundation for the evolution of sales

    OpenAIRE

    Christina Matzke, Benedikt Wirth

    2008-01-01

    In our model, individual consumers follow simple behavioral decision rules based on imitation and habit as suggested in consumer research, social learning, and related fields. Demand can be viewed as the outcome of a population game whose revision protocol is determined by the consumers' behavioral rules. The consumer dynamics are then analyzed in order to explore the demand side and first implications for a strategic supply side.

  1. A non-standard approach to a market with boundedly rational consumers and strategic firms : part I: microfoundation for the evolution of sales

    OpenAIRE

    Matzke, Christina; Wirth, Benedikt

    2008-01-01

    In our model, individual consumers follow simple behavioral decision rules based on imitation and habit as suggested in consumer research, social learning, and related fields. Demand can be viewed as the outcome of a population game whose revision protocol is determined by the consumers' behavioral rules. The consumer dynamics are then analyzed in order to explore the demand side and first implications for a strategic supply side.

  2. Rational points on some Fano cubic bundles

    CERN Document Server

    Batyrev, V V; Batyrev, Victor V; Tschinkel, Yuri

    1996-01-01

    We consider some families of smooth Fano hypersurfaces X_{n+2} in {\\bf P}^{n+2} \\times {\\bf P}^3 given by a homogeneous polynomial of bidegree (1,3). For these varieties we obtain lower bounds for the number of F-rational points of bounded anticanonical height in arbitrary nonempty Zariski open subset U \\subset X_{n+2}. These bounds contradict previous expectations about the distribution of F-rational points of bounded height on Fano varieties.

  3. A Rational Reconstruction of the Origin of the Covalent Bond and Its Implications for General Chemistry Textbooks.

    Science.gov (United States)

    Niaz, Mansoor

    2001-01-01

    Develops a perspective based on the history and philosophy of science considerations (rational reconstruction) in order to understand the postulation of the covalent bond by Lewis. Formulates four criteria based on the perspective and evaluates of 27 textbooks based on the four criteria. Shows that most textbooks lacked a history and philosophy of…

  4. Experimental evidence of incomplete fluorescence quenching of pyrene bound to humic substances: implications for Koc measurements.

    Science.gov (United States)

    Shirshin, E A; Budylin, G S; Grechischeva, N Yu; Fadeev, V V; Perminova, I V

    2016-07-01

    Fluorescence quenching (FQ) is extensively used for quantitative assessment of partition coefficients (KOC) of polycyclic aromatic hydrocarbons (PAHs) to natural organic materials - humic substances (HS). The presence of bound PAHs with incompletely quenched fluorescence would lead to underestimation of the KOC values measured by this technique. The goal of this work was to prove the validity of this assumption using an original experimental setup, which implied FQ measurements upon excitation into two distinct vibronically coupled electronic states. Pyrene was used as a fluorescent probe, and aquatic fulvic acid (SRFA) and leonardite humic acid (CHP) were used as the humic materials with low and high binding affinity for pyrene, respectively. Excitation of pyrene into the forbidden (S0-S1) and allowed (S0-S2) electronic states yielded two pairs of nonidentical FQ curves. This was indicative of incomplete quenching of the bound pyrene, and the divergence of the two FQ curves was much more pronounced for CHP as compared to SRFA. The two component model of fluorescence response formation was proposed to estimate the KOC values from the data obtained. The resulting pyrene KOC value for CHP (220 ± 20) g L(-1) was a factor 3 higher compared to the KOC value determined with the use of the Stern-Volmer formalism (68 ± 2) g L(-1). At the same time for aquatic FA the difference in FQ curves was almost negligible, which enables the use of the Stern-Volmer formalism for weakly interacting HS and PAHs. PMID:27279258

  5. The Evolution of Public Opinion in Social Network Considering Bounded Rationality%有限理性转发者的社会网络舆情演化分析

    Institute of Scientific and Technical Information of China (English)

    张倩楠; 杨尊琦; 史浩

    2014-01-01

    基于新媒体时代下信息传播模式的现状,从网络未确认信息在理性人群体与有限理性人群体中传播的特点入手。基于演化博弈理论,针对虚拟网络及其中的理性人与有限理性人对于消息的不同行为,建立在不同行为下的收益-风险矩阵。通过博弈进化计算,讨论了两方均转发得到的净收益、仅一方转发时各自的净收益对选择策略的影响。从而得到不同情形下网民群体之间的进化稳定策略。结果表明:由于有限理性转发者的参与,导致即使只有一方选择转发仍能够得到整体的最大收益;仅一方转发时,总收益受到两方是否合作的影响。最后根据演化结果对网络监管部门的控制提出相关意见。%Based on the current situation of information dissemination mode, this article starts with the disseminating characteristics of a ra-tional man and a bounded rationality man's attitude towards Internet unconfirmed information. Adopting the theory of evolution game, the article studies the different behaviors of different groups towards information and finds an evolution stabilization strategy among cyber citi-zen groups under different situations. According to the analysis of the impact on selection strategy, the result indicates that integral maxi-mum return can be gained from one party' s transmitting actions because of the participation of bounded rationality group;general earnings will be influenced by whether both groups will cooperate if there is just one party being engaging in the transmitting. At last, advices on network supervision are given according to evolution result to help the related government department to carry out their work of monitoring and control effectively.

  6. Structure of product-bound SMG1 lipase: active site gating implications.

    Science.gov (United States)

    Guo, Shaohua; Xu, Jinxin; Pavlidis, Ioannis V; Lan, Dongming; Bornscheuer, Uwe T; Liu, Jinsong; Wang, Yonghua

    2015-12-01

    Monoacylglycerol and diacylglycerol lipases are industrially interesting enzymes, due to the health benefits that arise from the consumption of diglycerides compared to the traditional triglyceride oils. Most lipases possess an α-helix (lid) directly over the catalytic pocket which regulates the activity of the enzyme. Generally, lipases exist in active and inactive conformations, depending on the positioning of this lid subdomain. However, lipase SMG1, a monoacylglycerol and diacylglycerol specific lipase, has an atypical activation mechanism. In the present study we were able to prove by crystallography, in silico analysis and activity tests that only two positions, residues 102 and 278, are responsible for a gating mechanism that regulates the active and inactive states of the lipase, and that no significant structural changes take place during activation except for oxyanion hole formation. The elucidation of the gating effect provided data enabling the rational design of improved lipases with 6-fold increase in the hydrolytic activity toward diacylglycerols, just by providing additional substrate stabilization with a single mutation (F278N or F278T). Due to the conservation of F278 among the monoacylglycerol and diacylglycerol lipases in the Rhizomucor miehei lipase-like family, the gating mechanism described herein might represent a general mechanism applicable to other monoacylglycerol and diacylglycerol lipases as well. Database: Structural data are available in the Protein Data Bank under the accession numbers 4ZRE (F278D mutant) and 4ZRD (F278N mutant). PMID:26365206

  7. Artificial intelligence techniques for rational decision making

    CERN Document Server

    Marwala, Tshilidzi

    2014-01-01

    Develops insights into solving complex problems in engineering, biomedical sciences, social science and economics based on artificial intelligence. Some of the problems studied are in interstate conflict, credit scoring, breast cancer diagnosis, condition monitoring, wine testing, image processing and optical character recognition. The author discusses and applies the concept of flexibly-bounded rationality which prescribes that the bounds in Nobel Laureate Herbert Simon's bounded rationality theory are flexible due to advanced signal processing techniques, Moore's Law and artificial intellig

  8. 有限理性视角下提升危机决策能力的方法%On the Methods of Improving Crisis Decision-Making Ability from the Perspective of Bounded Rationality

    Institute of Scientific and Technical Information of China (English)

    樊钉

    2013-01-01

    Crisis decision-making ability is an important part of the government’s ruling ability. From the perspective of bounded rationality, crisis decision-making emphasizes the segmentation of decision problems and the avoidance of routine problems of distracting policymakers, strengthens playing full roles of other irrational factors such as experience, intuition and insight to control crisis spread within a maximum limit by making prompt decisions, and stresses the solution of grey zone problems of power division starting from conventional system construction, hence constantly improving the ability of crisis decision-making.%危机决策能力是政府执政能力的重要组成。有限理性视角下的危机决策强调细分决策问题,避免常规问题分散决策者注意力;强调充分发挥经验、直觉和洞察力等非理性因素,当机立断,最大限度控制危机蔓延;强调从常规制度结构建设入手,解决权力划分灰色区域的问题,不断提高危机决策的能力。

  9. Consumer theory with bounded rational preferences

    OpenAIRE

    Gerasimou, Georgios

    2009-01-01

    The neoclassical consumer maximizes utility and makes choices by completely preordering the feasible alternatives and weighing when indifferent. The consumer studied in this paper chooses by weighing when indifferent and also when indecisive, without necessarily preordering the alternatives or exhausting her budget. Preferences therefore need not be complete, transitive or non-satiated but are assumed strictly convex and "adaptive". The latter axiom is new and parallels that of ambiguity a...

  10. Ration System

    OpenAIRE

    Vymazalova, Hana

    2016-01-01

    The distribution of rations can be found in documents from different period of the Egyptian history but the general features of the ration system is not easy to trace. Most of the sources are the more or less fragmentary lists of wages/payments that reflect various conditions, such as status of the recipients, period to which the payment corresponds etc, that are not always known to us. Other documents provide us with categories of allowances ascribed to the workmen and officials who particip...

  11. Consumer rationality in choice

    OpenAIRE

    Conlon, B.J.

    2001-01-01

    The dissertation concentrates on consumer choice and the ability of current modelling approaches to capture the underlying behaviour of the individual decision-makers. The standard assumption of a rational utility maximising individual and its implications for observed behaviour are examined and demonstrated empirically to be incompatible with actual consumer choices. In particular the complexity of the choice situation, and its various components, are found to be major determinants of the ch...

  12. Baseline rationing

    DEFF Research Database (Denmark)

    Hougaard, Jens Leth; Moreno-Ternero, Juan D.; Østerdal, Lars Peter Raahave

    The standard problem of adjudicating conflicting claims describes a situation in which a given amount of a divisible good has to be allocated among agents who hold claims against it exceeding the available amount. This paper considers more general rationing problems in which, in addition to claim...

  13. Confucian Rationalism

    Science.gov (United States)

    Lam, Chi-Ming

    2014-01-01

    Nowadays, there is still a widely held view that the Chinese and Western modes of thought are quite distinct from each other. In particular, the Chinese mode of thought derived from Confucianism is considered as comparatively less rational than the Western one. In this article, I first argue that although the analogical mode of argumentation,…

  14. Rational valuations

    Directory of Open Access Journals (Sweden)

    Georg Spielthenner

    2007-01-01

    Full Text Available Valuations are ubiquitous. We may be for or against genetically modified food; we find some politicians irresponsible; we prefer Beethoven to rock ‘n’ roll or vice versa; some enjoy bird-watching while others find it boring; and we may think that we have to tighten up on green-house gas emissions. Valuing is pervasive and often we are not even aware that we are valuing. However, many of ourvaluations are ill grounded and rationally defective. They are frequently based on misinformation, sloppy thinking, prejudice, and are biased in many ways as psychological research shows. For this reason there is widespread agreement among phi-losophers that we need an account of substantive valuational rationality, both for the theory of practical reasoning and for ethics as well. My main objectin this paper is to outline such an account and to present a principle that allows a non-technical rational criticism of valuations

  15. Learning Rational Expectations under Computability Constraints.

    OpenAIRE

    Spear, Stephen E

    1989-01-01

    In this paper, the author considers how boundedly rational agents learn rational expectations when all equilibrium price functions or forecasts of future equilibrium prices are required to be computable. The paper examines two learning environments. In the first, agents have perfect information about the state of nature. In this case, the theory of machine inference can be applied to show that there is a broad class of computable economies whose rational expectations equilibria can be learned...

  16. Simple market equilibria with rationally inattentive consumers

    Czech Academy of Sciences Publication Activity Database

    Matějka, Filip; McKay, A.

    2012-01-01

    Roč. 102, č. 3 (2012), s. 24-29. ISSN 0002-8282 R&D Projects: GA ČR(CZ) GPP402/11/P236 Institutional support: RVO:67985998 Keywords : rational choice theory * bounded rationality * consumer research Subject RIV: AH - Economics Impact factor: 2.792, year: 2012

  17. Collective action and rationality models

    Directory of Open Access Journals (Sweden)

    Luis Miguel Miller Moya

    2004-01-01

    Full Text Available The Olsonian theory of collective action (Olson, 1965 assumes a model of economic rationality, based on a simple calculus between costs and benefits, that can be hardly hold at present, given the models of rationality proposed recently by several fields of research. In relation to these fields, I will concentrate in two specific proposals, namely: evolutionary game theory and, over all, the theory of bounded rationality. Both alternatives are specially fruitful in order to propose models that do not need a maximizing rationality, or environments of complete and perfect information. Their approaches, based on the possibility of individual learning over the time, have contributed to the analysis of the emergence of social norms, which is something really necessary to the resolution of problems related to cooperation. Thus, this article asserts that these two new theoretical contributions make feasible a fundamental advance in the study of collective action.

  18. 有限理性条件下项目团队合作中多代理人行为演化%Research on Multi-Agent Evolutionary Behavior with Bounded Rationality in Project Team Cooperation

    Institute of Scientific and Technical Information of China (English)

    韩姣杰; 周国华; 李延来; 陆绍凯

    2011-01-01

    项目团队成员的行为策略选择将会直接影响到团队合作效率,甚至影响项目的成败.运用行为经济学的相关理论,以有限理性为假设前提,建立了基于异质群体的动态演化博弈模型,对项目团队合作中多代理人的行为进行了研究,分析了委托人的监督策略、利润分享系数,以及代理人的贡献度、团队合作度,其他代理人的行为对代理人行为选择策略的影响,为降低项目团队合作中的道德风险和提高团队整体绩效提供了策略建议.通过案例研究对得出的结论进行了检验,结果表明,该结论在实际项目中对提高项目整体绩效水平有很好的指导作用.%The behavior strategies that project team members chose will directly have a great impact on the cooperation efficiency of project team, and will further influence the success of project. By using the relative theory of behavioral economics, this paper built an evolutionary game model based on heterogeneous group under the assumption of bounded rationality in order to analyze the influences of principal's supervision strategy, profit sharing coefficient, agent's contribution, team cooperation degree, and the behavior choices of the other agents on the behavior choices of an given agent. The results of this paper have provided theoretical supports and strategic suggestions on how to reduce the moral hazards with respect to the cooperation of project team, as well as how to improve the team performance. Finally, a case study was carried out so as to test previous theoretical results, and it found that the theoretical results played a conducting role in improving the overall project performance in actual projects.

  19. Rational decisions

    CERN Document Server

    Binmore, Ken

    2008-01-01

    It is widely held that Bayesian decision theory is the final word on how a rational person should make decisions. However, Leonard Savage--the inventor of Bayesian decision theory--argued that it would be ridiculous to use his theory outside the kind of small world in which it is always possible to ""look before you leap."" If taken seriously, this view makes Bayesian decision theory inappropriate for the large worlds of scientific discovery and macroeconomic enterprise. When is it correct to use Bayesian decision theory--and when does it need to be modified? Using a minimum of mathematics,

  20. Rationalization: A Bibliography.

    Science.gov (United States)

    Pedrini, D. T.; Pedrini, Bonnie C.

    Rationalization was studied by Sigmund Freud and was specifically labeled by Ernest Jones. Rationalization ought to be differentiated from rational, rationality, logical analysis, etc. On the one hand, rationalization is considered a defense mechanism, on the other hand, rationality is not. Haan has done much work with self-report inventories and…

  1. Rational inattention or rational overreaction?

    DEFF Research Database (Denmark)

    Browning, Martin; Hansen, Lars Gårn; Smed, Sinne

    We investigate differences in how consumers of fish react to health information in the mass media. We specify a dynamic empirical model that allows for heterogeneity in all basic parameters of consumer behavior as well as in how consumers react to information. We estimate the model using a unique...... houshold panel tracking consumption, prices, news stories and media habits over 24 quarters. We fi nd that the consumers most likely to be ’rationally ignorant’ of health effects react more dramatically to health news than the consumers who most likely are well informed....

  2. Implications of the Stability and Triviality Bounds on the Standard Model with Three and Four Chiral Generations

    CERN Document Server

    Wingerter, Akin

    2011-01-01

    We revisit the stability and triviality bounds on the Higgs boson mass in the context of the Standard Model with three and four generations (SM3 and SM4, respectively). In light of the recent results from LHC the triviality bound in the SM3 has now become obsolete, and the stability bound implies for a Higgs mass of e.g. mH=115 GeV the onset of new physics before 650 TeV, whereas there are no limits for mH>133 GeV. For the SM4, the stability and triviality curves intersect and bound a finite region. As a consequence, the fourth generation fermions place stringent theoretical limits on the Higgs mass, and there is a maximal scale beyond which the theory cannot be perturbatively valid. We find that the Higgs mass cannot exceed 700 GeV for any values of the fourth generation fermion masses. Turning the argument around, the absence of a Higgs signal for mH<600 GeV excludes a fourth generation with quark masses below 300 GeV and lepton masses below 350 GeV. In particular, the quark bounds also hold for the smal...

  3. Implications of the stability and triviality bounds on the standard model with three and four chiral generations

    International Nuclear Information System (INIS)

    We revisit the stability and triviality bounds on the Higgs boson mass in the context of the standard model with three and four generations (SM3 and SM4, respectively). In light of the recent results from LHC, the triviality bound in the SM3 has now become obsolete, and the stability bound implies for a Higgs mass of e.g. mH=115 GeV the onset of new physics before Λ=650 TeV, whereas there are no limits for mH≥133 GeV. For the SM4, the stability and triviality curves intersect and bound a finite region. As a consequence, the fourth generation fermions place stringent theoretical limits on the Higgs mass, and there is a maximal scale beyond which the theory cannot be perturbatively valid. We find that the Higgs mass cannot exceed 700 GeV for any values of the fourth generation fermion masses. Turning the argument around, the absence of a Higgs signal for mH≤600 GeV excludes a fourth generation with quark masses below 300 GeV and lepton masses below 350 GeV. In particular, the quark bounds also hold for the small mixing scenarios for which the direct limits from Tevatron and LHC are not applicable, and the lepton bounds we obtain are stronger than the collider limits. If a Higgs boson lighter than 700 GeV is not observed, a fourth generation of chiral fermions with perturbative Yukawa couplings will be conclusively excluded for the full range of parameters.

  4. Two distinct myosin light chain structures are induced by specific variations within the bound IQ motifs—functional implications

    OpenAIRE

    Terrak, Mohammed; Wu, Guanming; Stafford, Walter F.; Lu, Renne C.; Dominguez, Roberto

    2003-01-01

    IQ motifs are widespread in nature. Mlc1p is a calmodulin-like myosin light chain that binds to IQ motifs of a class V myosin, Myo2p, and an IQGAP-related protein, Iqg1p, playing a role in polarized growth and cytokinesis in Saccharomyces cerevisiae. The crystal structures of Mlc1p bound to IQ2 and IQ4 of Myo2p differ dramatically. When bound to IQ2, Mlc1p adopts a compact conformation in which both the N- and C-lobes interact with the IQ motif. However, in the complex with IQ4, the N-lobe no...

  5. Rational kinematics

    CERN Document Server

    Angeles, Jorge

    1988-01-01

    A rational study of kinematics is a treatment of the subject based on invariants, i.e., quantities that remain essentially unchanged under a change of observer. An observer is understood to be a reference frame supplied with a clock (Truesdell 1966). This study will therefore include an introduction to invariants. The language of these is tensor analysis and multilinear algebra, both of which share many isomorphic relations, These subjects are treated in full detail in Ericksen (1960) and Bowen and Wang (1976), and hence will not be included here. Only a short account of notation and definitions will be presented. Moreover, definitions and basic concepts pertaining to the kinematics of rigid bodies will be also included. Although the kinematics of rigid bodies can be regarded as a particular case of the kinematics of continua, the former deserves attention on its own merits for several reasons. One of these is that it describes locally the motions undergone by continua. Another reason is that a whole area of ...

  6. Meat Demand under Rational Habit Persistence

    OpenAIRE

    Zhen, Chen; Wohlgenant, Michael K.

    2005-01-01

    The objective of this paper is to explore the theoretical implications of a meat demand model with rational habits. To introduce consumption dynamics, habit persistence is used to motivate intertemporally related preferences. The impact of food safety information on meat consumption is systematically analyzed. Important differences between myopic habits and rational habits are outlined.

  7. Information Transmission and Rational Inattention

    OpenAIRE

    Antonella Tutino

    2015-01-01

    We study the problem of optimal communication strategy between a fully informed agent and a rationally inattentive agent. The fully informed agent observes a sequence of shocks and transmits a message to the limited-capacity agent who takes a set of actions in response to the message. The problem of the informed agent is to seek the optimal signaling strategy that induces a behavior consistent with minimal welfare loss, uniformly over a given class of bounded utility functions. We characteriz...

  8. On Probabilistic Rationing Methods

    OpenAIRE

    Tasnádi, Attila

    2002-01-01

    Rationing occurs if the demand for a certain good exceeds its supply. In such situations a rationing method has to be specified in order to determine the allocation of the scarce good to the agents. Moulin (1999) introduced the notion of probabilistic rationing methods for the discrete framework. In this paper we establish a link between classical and probabilistic rationing methods. In particular, we assign to any given classical rationing method a probabilistic rationing method with minimal...

  9. Interaction of Calcium-bound C-reactive Protein with Fibronectin Is Controlled by pH: IN VIVO IMPLICATIONS*

    OpenAIRE

    Suresh, Madathilparambil V.; Singh, Sanjay K.; Agrawal, Alok

    2004-01-01

    C-reactive protein (CRP) binds with high affinity to fibronectin (Fn), a major component of the extracellular matrix (ECM), but at physiological pH the binding is inhibited by calcium ions (Ca2+). Because CRP circulates in the blood in Ca2+-bound form, the occurrence of CRP-Fn interactions in vivo has been doubtful. To define the basis of inhibition of CRP-Fn interaction by Ca2+ at pH 7.0, we hypothesized that Fn-binding site on CRP consisted of amino acids co-ordinating Ca2+. Site-directed m...

  10. Bounded Earthquakes

    OpenAIRE

    Saric, Dragomir

    2006-01-01

    We give a short proof of the fact that bounded earthquakes of the unit disk induce quasisymmetric maps of the unit circle. By a similar method, we show that symmetric maps are induced by bounded earthquakes with asymptotically trivial measures.

  11. Characterization and reactivity of the weakly bound complexes of the [H, N, S]− anionic system with astrophysical and biological implications

    International Nuclear Information System (INIS)

    We investigate the lowest electronic states of doublet and quartet spin multiplicity states of HNS− and HSN− together with their parent neutral triatomic molecules. Computations were performed using highly accurate ab initio methods with a large basis set. One-dimensional cuts of the full-dimensional potential energy surfaces (PESs) along the interatomic distances and bending angle are presented for each isomer. Results show that the ground anionic states are stable with respect to the electron detachment process and that the long range parts of the PESs correlating to the SH− + N, SN− + H, SN + H−, NH + S−, and NH− + S are bound. In addition, we predict the existence of long-lived weakly bound anionic complexes that can be formed after cold collisions between SN− and H or SH− and N. The implications for the reactivity of these species are discussed; specifically, it is shown that the reactions involving SH−, SN−, and NH− lead either to the formation of HNS− or HSN− in their electronic ground states or to autodetachment processes. Thus, providing an explanation for why the anions, SH−, SN−, and NH−, have limiting detectability in astrophysical media despite the observation of their corresponding neutral species. In a biological context, we suggest that HSN− and HNS− should be incorporated into H2S-assisted heme-catalyzed reduction mechanism of nitrites in vivo

  12. [Constitutional requirements of rationing].

    Science.gov (United States)

    Kluth, Winfried

    2008-01-01

    Rationing is an emotive issue in the field of public health. This complicates the rational discourse, which is indispensable for analyzing the rationing conditions as set out by constitutional law and which requires manifold differentiation and consideration that shall briefly be outlined in the following short contribution. Of central significance is the distinction between indirect and direct rationing as well as the reference to the essential responsibility of legislators for rationing decisions. PMID:19004184

  13. Scarcity of cycles for rational functions over a number field

    OpenAIRE

    Canci, J. K.; Vishkautsan, Solomon

    2016-01-01

    We provide an explicit bound on the number of periodic points of a rational function defined over a number field, where the bound depends only on the number of primes of bad reduction and the degree of the function, and is linear in the degree. More generally, we show that there exists an explicit uniform bound on the number of periodic points for any rational function in a given finitely generated semigroup (under composition) of rational functions of degree at least 2. We show that under st...

  14. Rational choice in field archaelology

    Directory of Open Access Journals (Sweden)

    Cătălin Pavel

    2011-11-01

    Full Text Available In the present article I attempt to apply advances in the study of instrumental and epistemic rationality to field archaeology in order to gain insights into the ways archaeologists reason. The cognitive processes, particularly processes of decision making, that enable archaeologists to conduct the excavation in the trench have not been adequately studied so far. I take my cues from two different bodies of theory. I first inquire into the potential that rational choice theory (RCT may have in modeling archaeological behaviour, and I define subjective expected utility, which archaeologists attempt to maximize, in terms of knowledge acquisition and social gain. Following Elster’s criticism of RCT, I conclude that RCT’s standards for rational action do not correspond with those ostensibly used in field archaeology, but that instrumental rationality has a prominent role in the “archaeological experiment”. I further explore if models proposed as reaction to RCT may account for archaeological decision making. I focus on fast and frugal heuristics, and search for archaeological illustrations for some of the cognitive biases that are better documented in psychological literature. I document confirmation and congruence biases, the endowment effect, observer-expectancy bias, illusory correlation, clustering illusion, sunk cost bias, and anchoring, among others and I propose that some of these biases are used as cognitive tools by archaeologists at work and retain epistemic value. However, I find formal logic to be secondary in the development of archaeological reasoning, with default logic and defeasible logic being used instead. I emphasize scientific knowledge as an actively negotiated social product of human inquiry, and conclude that to describe rationality in field archaeology a bounded rationality model is the most promising avenue of investigation.

  15. Characterization and reactivity of the weakly bound complexes of the [H, N, S]{sup −} anionic system with astrophysical and biological implications

    Energy Technology Data Exchange (ETDEWEB)

    Trabelsi, T.; Ajili, Y.; Ben Yaghlane, S.; Jaidane, N.-E. [Laboratoire de Spectroscopie Atomique, Moléculaire et Applications–LSAMA, Université de Tunis El Manar, Tunis (Tunisia); Mogren Al-Mogren, M. [Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451 (Saudi Arabia); Francisco, J. S. [Department of Chemistry and Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47906 (United States); Hochlaf, M., E-mail: hochlaf@univ-mlv.fr [Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 Blvd. Descartes, 77454 Marne-la-Vallée (France)

    2015-07-21

    We investigate the lowest electronic states of doublet and quartet spin multiplicity states of HNS{sup −} and HSN{sup −} together with their parent neutral triatomic molecules. Computations were performed using highly accurate ab initio methods with a large basis set. One-dimensional cuts of the full-dimensional potential energy surfaces (PESs) along the interatomic distances and bending angle are presented for each isomer. Results show that the ground anionic states are stable with respect to the electron detachment process and that the long range parts of the PESs correlating to the SH{sup −} + N, SN{sup −} + H, SN + H{sup −}, NH + S{sup −}, and NH{sup −} + S are bound. In addition, we predict the existence of long-lived weakly bound anionic complexes that can be formed after cold collisions between SN{sup −} and H or SH{sup −} and N. The implications for the reactivity of these species are discussed; specifically, it is shown that the reactions involving SH{sup −}, SN{sup −}, and NH{sup −} lead either to the formation of HNS{sup −} or HSN{sup −} in their electronic ground states or to autodetachment processes. Thus, providing an explanation for why the anions, SH{sup −}, SN{sup −}, and NH{sup −}, have limiting detectability in astrophysical media despite the observation of their corresponding neutral species. In a biological context, we suggest that HSN{sup −} and HNS{sup −} should be incorporated into H{sub 2}S-assisted heme-catalyzed reduction mechanism of nitrites in vivo.

  16. Planning rationality and relativism

    OpenAIRE

    D van Houten

    1989-01-01

    In traditional planning thought, purposive rationality is a key concept. The assumption is that it reduces uncertainties. Discussion of this positivist planning paradigm is ongoing. Part of the discussion concerns cognitive realism, a key issue in the sociology of knowledge. On the whole, cognitive relativism and purposive rationality are strange bedfellows. Other kinds of rationality pose less of a problem. This paper is an elaboration upon Mannheim's concept of substantial rationality and h...

  17. Rationing with baselines

    DEFF Research Database (Denmark)

    Hougaard, Jens Leth; Moreno-Ternero, Juan D.; Østerdal, Lars Peter Raahave

    2013-01-01

    We introduce a new operator for general rationing problems in which, besides conflicting claims, individual baselines play an important role in the rationing process. The operator builds onto ideas of composition, which are not only frequent in rationing, but also in related problems such as...... bargaining, choice, and queuing. We characterize the operator and show how it preserves some standard axioms in the literature on rationing. We also relate it to recent contributions in such literature....

  18. Principles of justice in health care rationing

    OpenAIRE

    Cookson, R; Dolan, P.

    2000-01-01

    This paper compares and contrasts three different substantive (as opposed to procedural) principles of justice for making health care priority-setting or "rationing" decisions: need principles, maximising principles and egalitarian principles. The principles are compared by tracing out their implications for a hypothetical rationing decision involving four identified patients. This decision has been the subject of an empirical study of public opinion based on small-group discussions, which fo...

  19. On rationally supported surfaces

    DEFF Research Database (Denmark)

    Gravesen, Jens; Juttler, B.; Sir, Z.

    2008-01-01

    We analyze the class of surfaces which are equipped with rational support functions. Any rational support function can be decomposed into a symmetric (even) and an antisymmetric (odd) part. We analyze certain geometric properties of surfaces with odd and even rational support functions. In partic...

  20. Rationing medical education.

    Science.gov (United States)

    Walsh, Kieran

    2016-03-01

    The purpose of this paper is to discuss the role of rationing in medical education. Medical education is expensive and there is a limit to that which governments, funders or individuals can spend on it. Rationing involves the allocation of resources that are limited. This paper discussed the pros and cons of the application of rationing to medical education and the different forms of rationing that could be applied. Even though some stakeholders in medical education might be taken aback at the prospect of rationing, the truth is that rationing has always occurred in one form or another in medical education and in healthcare more broadly. Different types of rationing exist in healthcare professional education. For example rationing may be implicit or explicit or may be based on macro-allocation or micro-allocation decisions. Funding can be distributed equally among learners, or according to the needs of individual learners, or to ensure that overall usefulness is maximised. One final option is to allow the market to operate freely and to decide in that way. These principles of rationing can apply to individual learners or to institutions or departments or learning modes. Rationing is occurring in medical education, even though it might be implicit. It is worth giving consideration to methods of rationing and to make thinking about rationing more explicit. PMID:27358649

  1. Effect of the Household Bounded Rationality Decision-making about Land Use Behavior:A Case Study for Gaoxigou Village of Mizhi County in Shaanxi Province%农户有限理性土地利用行为决策影响因素——以陕西省米脂县高西沟村为例

    Institute of Scientific and Technical Information of China (English)

    陈姗姗; 陈海; 梁小英; 刘俊新

    2012-01-01

    利用有限理性理论与方法进行行为决策研究已成为多样化决策研究中的热点。研究微观尺度土地利用变化中农户有限理性行为决策的影响因素,对于揭示农户土地利用驱动因子、调整农户决策行为与优化农业景观格局具有重要的理论与现实意义。论文以陕西省米脂县高西沟村为例,通过构建农户效应收益模型,利用2009—2011年农户调查数据揭示理性最优决策与农户实际决策之间的差异性;利用体现农户行为满意度的Probit模型分析有限理性决策的影响因素。结论为:①高西沟村农户理性最优决策与实际决策差异性较大,说明农户在实践中采用有限理性进行土地利用生产;②构建Probit模型模拟农户满意度决策行为态度,选取的4类变量较好地解释了农户决策的影响因子。其中,农业收入回归系数为0.78、反映相对经济地位下降变量0.41、退耕面积-0.42、耕地面积-0.62、打工收入-0.34、性别0.48、劳动力0.31,均处于显著相关水平。各变量估计结果与理论预测和实际调查结果相符合,具有较强的解释力。%Using the bounded rationality and behavior decision-making mechanism to research human decision-making behavior has become one of the hot-spots in rational diversification of Modern Economics.In this paper,we discussed the influencing factors of peasant household bounded rationality and behavior decision-making in microscopic scale of land use change.A case was studied for Gaoxigou Village of Mizhi County in Shaanxi Province.After establishing the household income expectation model,using 2009-2011 household survey data,the differences between the rational optimal decision and the farmers'actual decision-making were indentified firstly.Then based on bounded rationality idea,using the Probit model which can better reflect the satisfaction of farmer's decision to explain and analyze these differences and the

  2. Bounding the $\

    CERN Document Server

    Gutiérrez-Rodríguez, A

    2003-01-01

    A bound on the nu /sup tau / magnetic moment is calculated through the reaction e/sup +/e/sup -/ to nu nu gamma at the Z/sub 1/-pole, and in the framework of a left-right symmetric model at LEP energies. We find that the bound is almost independent of the mixing angle phi of the model in the allowed experimental range for this parameter. (31 refs).

  3. Rational Limits to Arbitrage

    OpenAIRE

    Zigrand, Jean-Pierre

    2001-01-01

    It is often argued that asset prices exhibit patterns incompatible with the behaviour of rational, optimizing agents. This paper proposes a rational framework which generates asset prices which appear irrational. This is accomplished by studying rational expectations equilibria in the presence of two realistic market frictions: immediacy risk (agents have to submit their demand functions before they know the equilibrium price) and asset-specific orders (investors have to submit one seperate d...

  4. Provably Bounded-Optimal Agents

    OpenAIRE

    Russell, S J; Subramanian, D.

    1995-01-01

    Since its inception, artificial intelligence has relied upon a theoretical foundation centered around perfect rationality as the desired property of intelligent systems. We argue, as others have done, that this foundation is inadequate because it imposes fundamentally unsatisfiable requirements. As a result, there has arisen a wide gap between theory and practice in AI, hindering progress in the field. We propose instead a property called bounded optimality. Roughly speaking, an agent is boun...

  5. Evidence of Rational Addiction to Carbonated Soft Drinks?

    OpenAIRE

    Rigoberto A. Lopez; Xiaoou Liu

    2012-01-01

    The purpose of this paper is to apply the Becker-Murphy theory of rational addiction to the case of carbonated soft drinks. The research aims to reveal the rational addiction evidence of carbonated soft drinks and derive policy implications under this evidence. Consumers' rational addictive evidence for carbonated soft drinks provides a warning for the Chinese government to regulate the industry, due to its bad health consequences. – The authors empirically apply a time-varying parameter mode...

  6. Enculturated Chimpanzees Imitate Rationally

    Science.gov (United States)

    Buttelmann, David; Carpenter, Malinda; Call, Josep; Tomasello, Michael

    2007-01-01

    Human infants imitate others' actions "rationally": they copy a demonstrator's action when that action is freely chosen, but less when it is forced by some constraint (Gergely, Bekkering & Kiraly, 2002). We investigated whether enculturated chimpanzees (Pan troglodytes) also imitate rationally. Using Gergely and colleagues' (2002) basic procedure,…

  7. Two Concepts of Rationality

    Directory of Open Access Journals (Sweden)

    Danny Frederick

    2010-02-01

    Full Text Available The dominant tradition in Western philosophy sees rationality as dictating. Thus rationality may require that we believe the best explanation and simple conceptual truths and that we infer in accordance with evident rules of inference. I argue that, given what we know about the growth of knowledge, this authoritarian concept of rationality leads to absurdities and should be abandoned. I then outline a libertarian concept of rationality, derived from Popper, which eschews the dictates and which sees a rational agent as one who questions, criticises, conjectures and experiments. I argue that, while the libertarian approach escapes the absurdities of the authoritarian, it requires two significant developments and an important clarification to be made fully consistent with itself.

  8. 对人性的尊重--论康德的理性主体观及其法律意蕴%Respect for Humanity---On Kant ’ s Concept of Rational Subject and Its Legal Implications

    Institute of Scientific and Technical Information of China (English)

    马靖云

    2015-01-01

    Immanuel Kant made his rational subject of human nature based on the criticism and inheritance of the Hume’s philosophy.Kant made the world dualistic in order to release the land for human activities , he believes that human are dominated and subjected by the law of experience but at the same time , have the ability to practice beyond those experiences and act in the meaning of practical reason .Human are considered as rational subjects with the abili-ty of self-regulations .Human are also considered as goals with the highest purpose of nature that their absolute value cannot be calculated by prices , this is what be called “dignity”.Kant’ s philosophy is filled with the concept of re-spect for humanity and high praise of human independence and autonomy .Starting from the moral concepts , profound legal implications has implied in Kant ’ s philosophy as well .Therefore , Kant ’ s philosophy is in a great meaning for establishing rational behavior ,“people-oriented” legislation and legitimate law based -on common sense.%伊曼努尔·康德在对休谟哲学批判继承的基础上,提出了自己的理性主体的人性观。康德将世界二元化,以便为人性的活动留出地盘,他认为人既受经验的必然规律支配,又可以超越经验,遵循实践理性而行动。人是理性主体,因此具有意志自律的能力。人是目的,并且是自然的最高目的,人具有无法用价格计算的绝对价值,即尊严。康德的哲学充满了对人性的尊重,对人的独立性、自主性的高度赞扬。康德的理性主体观以道德为基点,却隐含了深厚的法律意蕴,对于理性行为准则的确立、“以人为本”的立法关怀、法律立足于普遍意志才能具备合法性的这一法治精神的弘扬均有着不可忽视的重要意义。

  9. Decision Making: Between Rationality and Reality

    Directory of Open Access Journals (Sweden)

    Marko Polič

    2009-12-01

    Full Text Available Almost by definition decision-making is typical human activity, and therefore important psychological subject. The starting point of its classical conception within psychology could be traced back to economy and mathematic, with ideas of human as rational economic being, and conceptualising decision making as choice between two or more alternatives, and as such being a separate event in space and time. Already in fifties Herbert Simon challenged such a view with his concept of bounded rationality, emerging from the joint effect of internal limitations of the human mind, and the structure of external environments in which the mind operates. During the last decades with the shift to the real word situations where decisions are embedded in larger tasks, becoming so part of the study of action, the lost rational human appeared again as efficient creature in the complex environment. Gigerenzer showed how heuristics help in this process.

  10. Exploring rationality in schizophrenia

    DEFF Research Database (Denmark)

    Revsbech, Rasmus; Mortensen, Erik Lykke; Owen, Gareth;

    2015-01-01

    Background Empirical studies of rationality (syllogisms) in patients with schizophrenia have obtained different results. One study found that patients reason more logically if the syllogism is presented through an unusual content. Aims To explore syllogism-based rationality in schizophrenia. Method...... Thirty-eight first-admitted patients with schizophrenia and 38 healthy controls solved 29 syllogisms that varied in presentation content (ordinary v. unusual) and validity (valid v. invalid). Statistical tests were made of unadjusted and adjusted group differences in models adjusting for intelligence and...... differences became non-significant. Conclusions When taking intelligence and neuropsychological performance into account, patients with schizophrenia and controls perform similarly on syllogism tests of rationality....

  11. Rational Orthogonal Calculus

    OpenAIRE

    Barnes, David

    2015-01-01

    We show that one can use model categories to construct rational orthogonal calculus. That is, given a continuous functor from vector spaces to based spaces one can construct a tower of approximations to this functor depending only on the rational homology type of the input functor, whose layers are given by rational spectra with an action of $O(n)$. By work of Greenlees and Shipley, we see that these layers are classified by torsion $H^*(B SO(n))[O(n)/SO(n)]$-modules.

  12. Uncertainty, rationality, and agency

    CERN Document Server

    Hoek, Wiebe van der

    2006-01-01

    Goes across 'classical' borderlines of disciplinesUnifies logic, game theory, and epistemics and studies them in an agent-settingCombines classical and novel approaches to uncertainty, rationality, and agency

  13. Crab Rationalization Permit Program

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Crab Rationalization Program (Program) allocates BSAI crab resources among harvesters, processors, and coastal communities. The North Pacific Fishery Management...

  14. Rationalism in public Law

    OpenAIRE

    Gee, Graham; Webber, Grégoire C. N.

    2013-01-01

    Rationalism is ‘the stylistic criterion of all respectable politics’. So lamented political philosopher Michael Oakeshott in a series of essays published in the 1940s and 1950s. Rationalism, for Oakeshott, is shorthand for a propensity to prioritise the universal over the local, the uniform over the particular and, ultimately, principle over practice. It culminates in the triumph of abstract principles over practical knowledge in a manner that erodes our ability to engage in political activit...

  15. Rationalization of electric use

    International Nuclear Information System (INIS)

    This book indicates introduction of rationalization of electric use, necessity for check and how to check, the method to check rationalization of electric use such as management of power, production, preserve management on system for preserve, select of machine, plan for working, check point, management for reserve items and indication of maintain effect, electric equipment like power substation, wiring, motor, an electric furnace and an electric welder and machine facility. It also deals with the cases on improvement of nationalization of electric use.

  16. Time-Varying Beta: A Boundedly Rational Equilibrium Approach

    OpenAIRE

    Carl Chiarella; Roberto Dieci; Xue-Zhong He

    2010-01-01

    By taking into account conditional expectations and the dependence of the systematic risk of asset returns on micro- and macro-economic factors, the conditional CAPM with time-varying betas displays superiority in explaining the cross-section of returns and anomalies in a number of empirical studies. Most of the literature on time-varying beta is motivated by econometric estimation rather than explicit modelling of the stochastic behaviour of betas through agents' behaviour. Within the mean-v...

  17. Scale Invariance, Bounded Rationality and Non-Equilibrium Economics

    OpenAIRE

    Vazquez, Samuel E.

    2009-01-01

    We study a class of heterogeneous agent-based models which are based on a basic set of principles, and the most fundamental operations of an economic system: trade and product transformations. A basic guiding principle is scale invariance, which means that the dynamics of the economy should not depend on the units used to measure the different products. We develop the idea of a "near-equilibrium" expansion which allow us to study the dynamics of fluctuations around economic equilibrium. This ...

  18. Tax Morale and Tax Evasion: Social Preferences and Bounded Rationality

    OpenAIRE

    2012-01-01

    We study a family of models of tax evasion, where a flat-rate tax finances only the provision of public goods, neglecting audits and wage differences. We focus on the comparison of two modeling approaches. The first is based on optimizing agents, who are endowed with social preferences, their utility being the sum of private consumption and moral utility. The second approach involves agents acting according to simple heuristics. We find that while we encounter the traditionally shaped Laffer-...

  19. Implications of a Froissart bound saturation of $\\gamma^*$-$p$ deep inelastic scattering. Part I. Quark distributions at ultra small $x$

    CERN Document Server

    Block, Martin M; Ha, Phuoc; McKay, Douglas W

    2013-01-01

    We argue that the deep inelastic structure function $F_2^{\\gamma p}(x, Q^2)$, regarded as a cross section for virtual $\\gamma^*p$ scattering, is hadronic in nature. This implies that its growth is limited by the Froissart bound at high hadronic energies, giving a $\\ln^2 (1/x)$ bound on $F_2^{\\gamma p}$ as Bjorken $x\\rightarrow 0$. The same bound holds for the individual quark distributions. In earlier work, we obtained a very accurate global fit to the combined HERA data on $F_2^{\\gamma p}$ using a fit function which respects the Froissart bound at small $x$, and is equivalent in its $x$ dependence to the function used successfully to describe all high energy hadronic cross sections, including $\\gamma p$ scattering. We extrapolate that fit by a factor of $\\lesssim$3 beyond the HERA region in the natural variable $\\ln(1/x)$ to the values of $x$ down to $x=10^{-14}$ and use the results to derive the quark distributions needed for the reliable calculation of neutrino cross sections at energies up to $E_\

  20. The epistemic value of rationality

    OpenAIRE

    Alexandru W. A. POPP

    2008-01-01

    Models of rational choice use different definitions of rationality. However, there is no clear description of the latter. We recognize rationality as a conceptual conglomerate where reason, judgment, deliberation, relativity, behavior, experience, and pragmatism interact. Using our definition, the game theoretic idealized principle of rationality becomes absolute. Our model gives a more precise account of the players, of their true behavior. We show that the Rational Method (RM) is the only p...

  1. Doubling rational normal curves

    OpenAIRE

    Notari, Roberto; Ojeda, Ignacio; Spreafico, Maria Luisa

    2008-01-01

    In this paper, we study double structures supported on rational normal curves. After recalling the general construction of double structures supported on a smooth curve described in \\cite{fer}, we specialize it to double structures on rational normal curves. To every double structure we associate a triple of integers $ (2r,g,n) $ where $ r $ is the degree of the support, $ n \\geq r $ is the dimension of the projective space containing the double curve, and $ g $ is the arithmetic genus of the...

  2. [What did bachelard mean by "applied rationalism" ?].

    Science.gov (United States)

    Tiles, Mary

    2013-01-01

    Bachelard was concerned with the processes whereby scientific knowledge is acquired, including the activity of knowing subjects. He did not equate reasoning with logic but rather argued that reasoning resulted from the use of mathematics in organizing both thought and experimental practices, which is why he conceived science as applied mathematics. This had material and technical implications, for Bachelard was concerned with the element of reason inherent in technical materialism as well as the concrete reality inherent in applied rationalism. PMID:24091650

  3. Rational and Boundedly Rational Behavior in a Binary Choice Sender-Receiver Game

    Science.gov (United States)

    Landi, Massimiliano; Colucci, Domenico

    2008-01-01

    The authors investigate the strategic rationale behind the message sent by Osama bin Laden on the eve of the 2004 U.S. Presidential elections. They model this situation as a signaling game in which a population of receivers takes a binary choice, the outcome is decided by majority rule, sender and receivers have conflicting interests, and there is…

  4. Social Rationality as a Unified Model of Man (Including Bounded Rationality)

    NARCIS (Netherlands)

    Lindenberg, Siegwart

    2001-01-01

    In 1957, Simon published a collection of his essays under the title of “Models of Man: Social and Rational”. In the preface, he explains the choice for this title: All of the essays “are concerned with laying foundations for a science of man that will comfortably accommodate his dual nature as a soc

  5. Adaptive Rationality, Adaptive Behavior and Institutions

    Directory of Open Access Journals (Sweden)

    Volchik Vyacheslav, V.

    2015-12-01

    Full Text Available The economic literature focused on understanding decision-making and choice processes reveals a vast collection of approaches to human rationality. Theorists’ attention has moved from absolutely rational, utility-maximizing individuals to boundedly rational and adaptive ones. A number of economists have criticized the concepts of adaptive rationality and adaptive behavior. One of the recent trends in the economic literature is to consider humans irrational. This paper offers an approach which examines adaptive behavior in the context of existing institutions and constantly changing institutional environment. It is assumed that adaptive behavior is a process of evolutionary adjustment to fundamental uncertainty. We emphasize the importance of actors’ engagement in trial and error learning, since if they are involved in this process, they obtain experience and are able to adapt to existing and new institutions. The paper aims at identifying relevant institutions, adaptive mechanisms, informal working rules and practices that influence actors’ behavior in the field of Higher Education in Russia (Rostov Region education services market has been taken as an example. The paper emphasizes the application of qualitative interpretative methods (interviews and discourse analysis in examining actors’ behavior.

  6. Are Market Forecasts Rational?

    OpenAIRE

    Mishkin, Frederic S.

    1980-01-01

    This paper conducts tests of the rationality of both inflation and short-term interest rate forecasts in the bond market. These tests are developed with the theory of efficient markets and make use of security price data to infer information on market expectations.

  7. Ideal Theory, Real Rationality

    DEFF Research Database (Denmark)

    Flyvbjerg, Bent

    Understanding rationality and power are key to understanding actual political and administrative behavior. Political and administrative theory that ignores this fact stand in danger of being at best irrelevant or, at worst part of the problem it whishes to solve. The paper presents Jürgen Habermas...

  8. Between Magic and Rationality

    DEFF Research Database (Denmark)

    In Between Magic and Rationality, Vibeke Steffen, Steffen Jöhncke, and Kirsten Marie Raahauge bring together a diverse range of ethnographies that examine and explore the forms of reflection, action, and interaction that govern the ways different contemporary societies create and challenge the...

  9. Hegel's phenomenology of rationality

    DEFF Research Database (Denmark)

    Huggler, Jørgen

    2009-01-01

    The aim of this chapter is to elucidate Hegel's conception of rationality in the Phänomenologie des Geistes (1807), and to defend the thesis that he is an author engaged in discussion with a wide variety of sources. He uses sceptical reasoning to form a line of argument with a necessary progression...

  10. Rainfall erosivity in subtropical catchments and implications for erosion and particle-bound contaminant transfer: a case-study of the Fukushima region

    Directory of Open Access Journals (Sweden)

    J. P. Laceby

    2015-07-01

    Full Text Available The Fukushima Dai-ichi nuclear power plant (FDNPP accident in March 2011 resulted in a significant fallout of radiocesium over the Fukushima region. After reaching the soil surface, radiocesium is almost irreversibly bound to fine soil particles. Thereafter, rainfall and snow melt run-off events transfer particle-bound radiocesium downstream. Erosion models, such as the Universal Soil Loss Equation (USLE, depict a proportional relationship between rainfall and soil erosion. As radiocesium is tightly bound to fine soil and sediment particles, characterizing the rainfall regime of the fallout-impacted region is fundamental to modelling and predicting radiocesium migration. Accordingly, monthly and annual rainfall data from ~ 60 meteorological stations within a 100 km radius of the FDNPP were analysed. Monthly rainfall erosivity maps were developed for the Fukushima coastal catchments illustrating the spatial heterogeneity of rainfall erosivity in the region. The mean average rainfall in the Fukushima region was 1387 mm yr−1 (σ 230 with the mean rainfall erosivity being 2785 MJ mm ha−1 yr−1 (σ 1359. The results indicate that the majority of rainfall (60 % and rainfall erosivity (86 % occurs between June and October. During the year, rainfall erosivity evolves positively from northwest to southeast in the eastern part of the prefecture, whereas a positive gradient from north to south occurs in July and August, the most erosive months of the year. During the typhoon season, the coastal plain and eastern mountainous areas of the Fukushima prefecture, including a large part of the contamination plume, are most impacted by erosive events. Understanding these rainfall patterns, particularly their spatial and temporal variation, is fundamental to managing soil and particle-bound radiocesium transfers in the Fukushima region. Moreover, understanding the impact of typhoons is important for managing sediment transfers in subtropical regions impacted

  11. Rainfall erosivity in subtropical catchments and implications for erosion and particle-bound contaminant transfer: a case-study of the Fukushima region

    Science.gov (United States)

    Laceby, J. P.; Chartin, C.; Evrard, O.; Onda, Y.; Garcia-Sanchez, L.; Cerdan, O.

    2015-07-01

    The Fukushima Dai-ichi nuclear power plant (FDNPP) accident in March 2011 resulted in a significant fallout of radiocesium over the Fukushima region. After reaching the soil surface, radiocesium is almost irreversibly bound to fine soil particles. Thereafter, rainfall and snow melt run-off events transfer particle-bound radiocesium downstream. Erosion models, such as the Universal Soil Loss Equation (USLE), depict a proportional relationship between rainfall and soil erosion. As radiocesium is tightly bound to fine soil and sediment particles, characterizing the rainfall regime of the fallout-impacted region is fundamental to modelling and predicting radiocesium migration. Accordingly, monthly and annual rainfall data from ~ 60 meteorological stations within a 100 km radius of the FDNPP were analysed. Monthly rainfall erosivity maps were developed for the Fukushima coastal catchments illustrating the spatial heterogeneity of rainfall erosivity in the region. The mean average rainfall in the Fukushima region was 1387 mm yr-1 (σ 230) with the mean rainfall erosivity being 2785 MJ mm ha-1 yr-1 (σ 1359). The results indicate that the majority of rainfall (60 %) and rainfall erosivity (86 %) occurs between June and October. During the year, rainfall erosivity evolves positively from northwest to southeast in the eastern part of the prefecture, whereas a positive gradient from north to south occurs in July and August, the most erosive months of the year. During the typhoon season, the coastal plain and eastern mountainous areas of the Fukushima prefecture, including a large part of the contamination plume, are most impacted by erosive events. Understanding these rainfall patterns, particularly their spatial and temporal variation, is fundamental to managing soil and particle-bound radiocesium transfers in the Fukushima region. Moreover, understanding the impact of typhoons is important for managing sediment transfers in subtropical regions impacted by cyclonic activity.

  12. Strategic environmental assessment and the limits to rationality in decision making processes

    DEFF Research Database (Denmark)

    Kørnøv, Lone

    The paper focueses on the subject of rationality in decision making processes and the implications for the integration of SEA.......The paper focueses on the subject of rationality in decision making processes and the implications for the integration of SEA....

  13. Structures of native and affinity-enhanced WT1 epitopes bound to HLA-A*0201: implications for WT1-based cancer therapeutics

    OpenAIRE

    Borbulevych, Oleg Y.; Do, Priscilla; Baker, Brian M.

    2010-01-01

    Presentation of peptides by class I or class II major histocompatibility complex (MHC) molecules is required for the initiation and propagation of a T cell-mediated immune response. Peptides from the Wilms Tumor 1 transcription factor (WT1), upregulated in many hematopoetic and solid tumors, can be recognized by T cells and numerous efforts are underway to engineer WT1-based cancer vaccines. Here we determined the structures of the class I MHC molecule HLA-A*0201 bound to the native 126–134 e...

  14. Rationality and ritual

    International Nuclear Information System (INIS)

    The book concerns the Windscale Public Inquiry, held to investigate the application by British Nuclear Fuels to build a 1200 tonne per year thermal oxide reprocessing plant (THORP) for spent nuclear fuels from Britain and overseas. The subject is discussed under the headings: introduction (international dimensions; the Windscale Inquiry; conflict resolution and social drama; public debate and the sociology of knowledge); the decision-making legacy; oxide reprocessing - the background; the public inquiry tradition - a comparative perspective; the emergence of THORP from a private to a public issue (local and national planning politics); the process and impact of the Inquiry (opposition groups); judicial rationality, expert conflict, and political authority); the rationality and politics of analysis (proliferation; radiation risks; relative risks; the Ravenglass issue; discharge targets; general radiation protection arrangements); conclusion. (U.K.)

  15. Improved bounds on the radius and curvature of the K pi scalar form factor and implications to low-energy theorems

    CERN Document Server

    Abbas, Gauhar

    2009-01-01

    We obtain stringent bounds in the _S^{K pi}-c plane where these are the scalar radius and the curvature parameters of the scalar pi K form factor respectively using analyticity and dispersion relation constraints, the knowledge of the form factor from the well-known Callan-Treiman point m_K^2-m_pi^2, as well as at m_pi^2-m_K^2 which we call the second Callan-Treiman point. The central values of these parameters from a recent determination are accomodated in the allowed region provided the higher loop corrections to the value of the form factor at the second Callan-Treiman point reduce the one-loop result by about 3% with F_K/F_pi=1.21. Such a variation in magnitude at the second Callan-Treiman point yields 0.12 fm^2 \\lesssim _S^{K pi} \\lesssim 0.21 fm^2 and 0.56 GeV^{-4} \\lesssim c \\lesssim 1.47 GeV^{-4} and a strong correlation between them. A smaller value of F_K/F_pi shifts both bounds to lower values.

  16. The Cost of Rational Agency

    OpenAIRE

    Moss, Scott

    1999-01-01

    The rational agency assumption limits systems to domains of application that have never been observed. Moreover, representing agents as being rational in the sense of maximising utility subject to some well specified constraints renders software systems virtually unscalable. These properties of the rational agency assumption are shown to be unnecessary in representations or analogies of markets. The demonstration starts with an analysis of how the rational agency assumption limits the applica...

  17. Game interrupted: The rationality of considering the future

    Directory of Open Access Journals (Sweden)

    Brandon Almy

    2013-09-01

    Full Text Available The ``problem of points'', introduced by Paccioli in 1494 and solved by Pascal and Fermat 160 years later, inspired the modern concept of probability. Incidentally, the problem also shows that rational decision-making requires the consideration of future events. We show that naive responses to the problem of points are more future oriented and thus more rational in this sense when the problem itself is presented in a future frame instead of the canonical past frame. A simple nudge is sufficient to make decisions more rational. We consider the implications of this finding for hypothesis testing and predictions of replicability.

  18. Complex bounds for multimodal maps: bounded combinatorics

    OpenAIRE

    Smania, Daniel

    2000-01-01

    We proved the so called complex bounds for multimodal, infinitely renormalizable analytic maps with bounded combinatorics: deep renormalizations have polynomial-like extensions with definite modulus. The complex bounds is the first step to extend the renormalization theory of unimodal maps to multimodal maps.

  19. Portfolio competitions and rationality

    Czech Academy of Sciences Publication Activity Database

    Kuběna, Aleš Antonín; Šmíd, Martin

    Jihlava: College of Polytechnics Jihlava, 2013 - (Vojáčková, H.) ISBN 978-80-87035-76-4. [International Conference on Mathematical Methods in Economics 2013 /31./. Jihlava (CZ), 11.09.2013-13.09.2013] R&D Projects: GA ČR GA402/09/0965 Institutional support: RVO:67985556 Keywords : portfolio competition * game theory * behavioural finance Subject RIV: BB - Applied Statistics, Operational Research http://library.utia.cas.cz/separaty/2013/E/kubena-portfolio competitions and rationality.pdf

  20. On the rationality of Manx crabs

    Directory of Open Access Journals (Sweden)

    Tove Ahlbom

    2014-05-01

    Full Text Available This paper accepts the challenge posed by Godfrey Baldacchino in “Islands and despots”, published in Commonwealth & Comparative Politics in February 2012, to acknowledge and investigate the implications of the “expressions of harmony and solidarity” often observed in small island societies. To do so, aspects of the Isle of Man’s political and social life are discussed from the perspectives of popular rule and rationality. This paper argues that a homogeneity in preferences and the political practices of small island states might be a rational way of protecting a vulnerable economy and thus ensuring economic growth and a sufficient allocation to each island resident of the scarce resources required to survive. Such small island homogeneity and consensualism is therefore not necessarily indicating a deficient democratic practice, but might just connote another way of conducting democratic governance, spawned from a particular way of living and a particular range of needs

  1. Structures of native and affinity-enhanced WT1 epitopes bound to HLA-A*0201: Implications for WT1-based cancer therapeutics

    Energy Technology Data Exchange (ETDEWEB)

    Borbulevych, Oleg Y.; Do, Priscilla; Baker, Brian M. (Notre)

    2010-09-07

    Presentation of peptides by class I or class II major histocompatibility complex (MHC) molecules is required for the initiation and propagation of a T cell-mediated immune response. Peptides from the Wilms Tumor 1 transcription factor (WT1), upregulated in many hematopoetic and solid tumors, can be recognized by T cells and numerous efforts are underway to engineer WT1-based cancer vaccines. Here we determined the structures of the class I MHC molecule HLA-A*0201 bound to the native 126-134 epitope of the WT1 peptide and a recently described variant (R1Y) with improved MHC binding. The R1Y variant, a potential vaccine candidate, alters the positions of MHC charged side chains near the peptide N-terminus and significantly reduces the peptide/MHC electrostatic surface potential. These alterations indicate that the R1Y variant is an imperfect mimic of the native WT1 peptide, and suggest caution in its use as a therapeutic vaccine. Stability measurements revealed how the R1Y substitution enhances MHC binding affinity, and together with the structures suggest a strategy for engineering WT1 variants with improved MHC binding that retain the structural features of the native peptide/MHC complex.

  2. Structures of native and affinity-enhanced WT1 epitopes bound to HLA-A*0201: implications for WT1-based cancer therapeutics.

    Science.gov (United States)

    Borbulevych, Oleg Y; Do, Priscilla; Baker, Brian M

    2010-09-01

    Presentation of peptides by class I or class II major histocompatibility complex (MHC) molecules is required for the initiation and propagation of a T cell-mediated immune response. Peptides from the Wilms Tumor 1 transcription factor (WT1), upregulated in many hematopoetic and solid tumors, can be recognized by T cells and numerous efforts are underway to engineer WT1-based cancer vaccines. Here we determined the structures of the class I MHC molecule HLA-A*0201 bound to the native 126-134 epitope of the WT1 peptide and a recently described variant (R1Y) with improved MHC binding. The R1Y variant, a potential vaccine candidate, alters the positions of MHC charged side chains near the peptide N-terminus and significantly reduces the peptide/MHC electrostatic surface potential. These alterations indicate that the R1Y variant is an imperfect mimic of the native WT1 peptide, and suggest caution in its use as a therapeutic vaccine. Stability measurements revealed how the R1Y substitution enhances MHC binding affinity, and together with the structures suggest a strategy for engineering WT1 variants with improved MHC binding that retain the structural features of the native peptide/MHC complex. PMID:20619457

  3. Density of rational points on isotrivial rational elliptic surfaces

    OpenAIRE

    Várilly-Alvarado, Anthony

    2009-01-01

    For a large class of isotrivial rational elliptic surfaces (with section), we show that the set of rational points is dense for the Zariski topology, by carefully studying variations of root numbers among the fibers of these surfaces. We also prove that these surfaces satisfy a variant of weak-weak approximation. Our results are conditional on the finiteness of Tate-Shafarevich groups for elliptic curves over the field of rational numbers.

  4. The MUC4 membrane-bound mucin regulates esophageal cancer cell proliferation and migration properties: Implication for S100A4 protein

    Energy Technology Data Exchange (ETDEWEB)

    Bruyere, Emilie; Jonckheere, Nicolas; Frenois, Frederic [Inserm, UMR837, Jean-Pierre Aubert Research Center, Team 5 ' Mucins, Epithelial Differentiation and Carcinogenesis' , rue Polonovski, 59045 Lille Cedex (France); Universite Lille-Nord de France, 1 place de Verdun, 59045 Lille Cedex (France); Mariette, Christophe [Inserm, UMR837, Jean-Pierre Aubert Research Center, Team 5 ' Mucins, Epithelial Differentiation and Carcinogenesis' , rue Polonovski, 59045 Lille Cedex (France); Universite Lille-Nord de France, 1 place de Verdun, 59045 Lille Cedex (France); Department of Digestive and Oncological Surgery, University Hospital Claude Huriez, 1 place de Verdun, 59045 Lille Cedex (France); Van Seuningen, Isabelle, E-mail: isabelle.vanseuningen@inserm.fr [Inserm, UMR837, Jean-Pierre Aubert Research Center, Team 5 ' Mucins, Epithelial Differentiation and Carcinogenesis' , rue Polonovski, 59045 Lille Cedex (France); Universite Lille-Nord de France, 1 place de Verdun, 59045 Lille Cedex (France)

    2011-09-23

    Highlights: {yields} Loss of MUC4 reduces proliferation of esophageal cancer cells. {yields} MUC4 inhibition impairs migration of esophageal cancer cells but not their invasion. {yields} Loss of MUC4 significantly reduces in vivo tumor growth. {yields} Decrease of S100A4 induced by MUC4 inhibition impairs proliferation and migration. -- Abstract: MUC4 is a membrane-bound mucin known to participate in tumor progression. It has been shown that MUC4 pattern of expression is modified during esophageal carcinogenesis, with a progressive increase from metaplastic lesions to adenocarcinoma. The principal cause of development of esophageal adenocarcinoma is the gastro-esophageal reflux, and MUC4 was previously shown to be upregulated by several bile acids present in reflux. In this report, our aim was thus to determine whether MUC4 plays a role in biological properties of human esophageal cancer cells. For that stable MUC4-deficient cancer cell lines (shMUC4 cells) were established using a shRNA approach. In vitro (proliferation, migration and invasion) and in vivo (tumor growth following subcutaneous xenografts in SCID mice) biological properties of shMUC4 cells were analyzed. Our results show that shMUC4 cells were less proliferative, had decreased migration properties and did not express S100A4 protein when compared with MUC4 expressing cells. Absence of MUC4 did not impair shMUC4 invasiveness. Subcutaneous xenografts showed a significant decrease in tumor size when cells did not express MUC4. Altogether, these data indicate that MUC4 plays a key role in proliferative and migrating properties of esophageal cancer cells as well as is a tumor growth promoter. MUC4 mucin appears thus as a good therapeutic target to slow-down esophageal tumor progression.

  5. Weight-gain misperceptions and the third-person effect in Black and White college-bound females: potential implications for healthy weight management.

    Science.gov (United States)

    Webb, Jennifer B; Butler-Ajibade, Phoebe; Robinson, Seronda A; Lee, Shanique J

    2013-08-01

    Elements of social norm theory and communication theory on the third-person effect may prove useful in efforts to prevent excessive weight gain among emerging adults entering college. The present study explored the associations of race/ethnicity and BMI status with these socio-cognitive factors that may affect first-year weight regulation in a sample of Black (N = 247) and White (N = 94) college-bound females. Participants completed an online survey assessing first-year weight-gain perceived norms along with weight-change expectations and concerns. Results provided evidence of the persistence of the myth of the "Freshman 15", belief in the typicality of gaining weight during the first year of college, and significant concern about first-year weight gain. Initial findings further revealed a robust third-person effect whereby despite nearly 90% of the sample endorsing that first-year weight gain was common, only 12% expected they would experience weight gain. Main effects of race/ethnicity, BMI status, and their interaction further uncovered distinct patterns of findings. Preliminary results highlight the need for college health officials at both predominantly White as well as minority-serving institutions to adequately address the significant concern over first-year weight gain in conjunction with the desire to lose weight expressed by an appreciable number of incoming college females. Findings also advocate the utility of evaluating social norm theory and the third-person perceptual bias in the context of first-year weight gain to potentially enhance the design and effectiveness of healthy weight management initiatives among ethnically-diverse young women entering college. PMID:23910760

  6. The MUC4 membrane-bound mucin regulates esophageal cancer cell proliferation and migration properties: Implication for S100A4 protein

    International Nuclear Information System (INIS)

    Highlights: → Loss of MUC4 reduces proliferation of esophageal cancer cells. → MUC4 inhibition impairs migration of esophageal cancer cells but not their invasion. → Loss of MUC4 significantly reduces in vivo tumor growth. → Decrease of S100A4 induced by MUC4 inhibition impairs proliferation and migration. -- Abstract: MUC4 is a membrane-bound mucin known to participate in tumor progression. It has been shown that MUC4 pattern of expression is modified during esophageal carcinogenesis, with a progressive increase from metaplastic lesions to adenocarcinoma. The principal cause of development of esophageal adenocarcinoma is the gastro-esophageal reflux, and MUC4 was previously shown to be upregulated by several bile acids present in reflux. In this report, our aim was thus to determine whether MUC4 plays a role in biological properties of human esophageal cancer cells. For that stable MUC4-deficient cancer cell lines (shMUC4 cells) were established using a shRNA approach. In vitro (proliferation, migration and invasion) and in vivo (tumor growth following subcutaneous xenografts in SCID mice) biological properties of shMUC4 cells were analyzed. Our results show that shMUC4 cells were less proliferative, had decreased migration properties and did not express S100A4 protein when compared with MUC4 expressing cells. Absence of MUC4 did not impair shMUC4 invasiveness. Subcutaneous xenografts showed a significant decrease in tumor size when cells did not express MUC4. Altogether, these data indicate that MUC4 plays a key role in proliferative and migrating properties of esophageal cancer cells as well as is a tumor growth promoter. MUC4 mucin appears thus as a good therapeutic target to slow-down esophageal tumor progression.

  7. Rational Bubbles in Stock Prices?

    OpenAIRE

    Behzad T. Diba; Grossman, Herschel I.

    1985-01-01

    This paper reports empirical tests for the existence of rational bubbles in stock prices. The analysis focuses on a familiar model that defines market fundamentals to be the expected present value of dividends, discounted at a constantrate, and defines a rational bubble to be a self-confirming divergence of stock prices from market fundamentals in response to extraneous variables. The tests are based on the theoretical result that, if rational bubbles exist, time series obtained by differenci...

  8. $2^n-$rational maps

    OpenAIRE

    Kassotakis, Pavlos; Nieszporski, Maciej; Damianou, Pantelis

    2015-01-01

    We present a natural extension of the notion of nondegenerate rational maps (quadrirational maps) to arbitrary dimensions. We refer to these maps as $2^n-$rational maps. In this note we construct a rich family of $2^n-$rational maps. These maps by construction are involutions and highly symmetric in the sense that the maps and their companion maps have the same functional form.

  9. Overstatement and Rational Market Expectation

    OpenAIRE

    Illoong Kwon; Eunjung Yeo

    2008-01-01

    When an agent overstates his/her true performance, a rational market can simply discount the reported performance, and correctly guess the true performance. This paper shows, however, that such rational market discounting leads to less productive effort by the agent and less performance-pay by the principal. Therefore, a rational market and a profit-maximizing principal can exacerbate the lack of productive effort by the agent.

  10. Rational-slice Knots via Strongly Negative-amphicheiral Knots

    Institute of Scientific and Technical Information of China (English)

    KAWAUCHI AKIO

    2009-01-01

    We show that certain satellite knots of every strongly negative-amphicheiral rational knot are rational-slice knots. This proof also shows that the 0-surgery man-ifold of a certain strongly negative amphicheiral knot such as the figure-eight knot bounds a compact oriented smooth 4-manifold homotopy equivalent to the 2-sphere such that a second homology class of the 4-manifold is represented by a smoothly embedded 2-sphere if and only if the modulo two reduction of it is zero.

  11. Circuit lower bounds in bounded arithmetics

    Czech Academy of Sciences Publication Activity Database

    Pich, Ján

    2015-01-01

    Roč. 166, č. 1 (2015), s. 29-45. ISSN 0168-0072 R&D Projects: GA AV ČR IAA100190902 Keywords : bounded arithmetic * circuit lower bounds Subject RIV: BA - General Mathematics Impact factor: 0.548, year: 2014 http://www.sciencedirect.com/science/article/pii/S0168007214000888

  12. Paroles d’acteurs sociaux : L’implication de la Confédération des syndicats nationaux (CSN dans une démarche pour mieux aménager le temps de travail

    Directory of Open Access Journals (Sweden)

    Marie-France Benoit

    2010-05-01

    Full Text Available Ce texte présente le point de vue général de la CSN (Confédération des syndicats nationaux, Québec sur les questions touchant l’égalité hommes-femmes, ainsi que la conciliation travail-famille, dans le cadre du projet de recherche comparatif France-Québec sur la gouvernance de la conciliation travail-famille.This paper presents the point of view of la CSN (Confédération des syndicats nationaux, Québec on the issues of equality between men and women as well as work-family reconciliation, in the context of the comparative research project between France and Québec on the governance of work-family reconciliation.

  13. RATIONAL CUSTOMS CLEARANCE TECHNOLOGY CHOICE

    OpenAIRE

    Shramenko, N.; Andriets, V.

    2008-01-01

    Issues concerning cargo delivery efficiencyincrease by choice of rational customs clearance technology have been considered. Three possible variants of customs clearance andmethods which allow to define the most rational version of cargo delivery in international road communication based on main efficiency criteria for definite distance have been presented.

  14. A Causal Entropy Bound

    CERN Document Server

    Brustein, Ram

    2000-01-01

    The identification of a causal-connection scale motivates us to propose a new covariant bound on entropy within a generic space-like region. This "causal entropy bound", scaling as the square root of EV, and thus lying around the geometric mean of Bekenstein's S/ER and holographic S/A bounds, is checked in various "critical" situations. In the case of limited gravity, Bekenstein's bound is the strongest while naive holography is the weakest. In the case of strong gravity, our bound and Bousso's holographic bound are stronger than Bekenstein's, while naive holography is too tight, and hence typically wrong.

  15. Rational offset approximation of rational Bézier curves

    Institute of Scientific and Technical Information of China (English)

    CHENG Min; WANG Guo-jin

    2006-01-01

    The problem of parametric speed approximation of a rational curve is raised in this paper. Offset curves are widely used in various applications. As for the reason that in most cases the offset curves do not preserve the same polynomial or rational polynomial representations, it arouses difficulty in applications. Thus approximation methods have been introduced to solve this problem. In this paper, it has been pointed out that the crux of offset curve approximation lies in the approximation of parametric speed. Based on the Jacobi polynomial approximation theory with endpoints interpolation, an algebraic rational approximation algorithm of offset curve, which preserves the direction of normal, is presented.

  16. Scattering by bound nucleons

    International Nuclear Information System (INIS)

    Scattering of a particle by bound nucleons is discussed. Effects of nucleons that are bound in a nucleus are taken as a structure function. The way how to calculate the structure function is given. (author)

  17. Variance bounding Markov chains

    OpenAIRE

    Roberts, Gareth O.; Jeffrey S. Rosenthal

    2008-01-01

    We introduce a new property of Markov chains, called variance bounding. We prove that, for reversible chains at least, variance bounding is weaker than, but closely related to, geometric ergodicity. Furthermore, variance bounding is equivalent to the existence of usual central limit theorems for all L2 functionals. Also, variance bounding (unlike geometric ergodicity) is preserved under the Peskun order. We close with some applications to Metropolis–Hastings algorithms.

  18. Bounds on Two-Phase Frictional Pressure Gradient and Void Fraction in Circular Pipes

    OpenAIRE

    Awad, M M; Muzychka, Y. S.

    2014-01-01

    Simple rules are developed for obtaining rational bounds for two-phase frictional pressure gradient and void fraction in circular pipes. The bounds are based on turbulent-turbulent flow assumption. Both the lower and upper bounds for frictional pressure gradient are based on the separate cylinders formulation. For frictional pressure gradient, the lower bound is based on the separate cylinders formulation that uses the Blasius equation to represent the Fanning friction factor while the upper ...

  19. Bound states and the Bekenstein bound

    CERN Document Server

    Bousso, R

    2004-01-01

    We explore the validity of the generalized Bekenstein bound, S <= pi M a. We define the entropy S as the logarithm of the number of states which have energy eigenvalue below M and are localized to a flat space region of width a. If boundary conditions that localize field modes are imposed by fiat, then the bound encounters well-known difficulties with negative Casimir energy and large species number, as well as novel problems arising only in the generalized form. In realistic systems, however, finite-size effects contribute additional energy. We study two different models for estimating such contributions. Our analysis suggests that the bound is both valid and nontrivial if interactions are properly included, so that the entropy S counts the bound states of interacting fields.

  20. Skyrmion stars and the multilayered rational map ansatz

    International Nuclear Information System (INIS)

    We investigate the large baryon number sector of the Einstein-Skyrme model as a possible model for baryon stars and construct low energy configurations that resemble neutron stars. Previous studies have shown that gravitating Skyrmions produced by using rational maps can achieve spherically symmetric, multibaryon-bound states at large baryon numbers, but these configurations were hollow shells. In this paper, we improve on the previous work by constructing configurations corresponding to solid spheres with a radius-dependent baryon density.

  1. A new perspective to rational expectations: Maximin rational expectations equilibrium

    OpenAIRE

    Castro, Luciano I.; Pesce, Marialaura; Nicholas C. Yannelis

    2010-01-01

    We introduce a new notion of rational expectations equilibrium (REE) called maximin rational expectations equilibrium (MREE), which is based on the maximin expected utility (MEU) formulation. In particular, agents maximize maximin expected utility conditioned on their own private information and the information that the equilibrium prices generate. Maximin equilibrium allocations need not to be measurable with respect to the private information of each individual and with respect to the infor...

  2. Mobilization for energy renovation. Preliminary results of a survey on rational and heuristic thinking of the dwellers.

    OpenAIRE

    Taranu, Victoria; VERBEECK, Griet

    2016-01-01

    Mobilization for energy renovation. The commonly used policies to encourage the uptake of energy efficient measures in renovations are mostly based on monetary incentives and information provision. Both these approaches have the underlying assumption that dwellers act exclusively as rational homo economicus, who has unlimited intellectual capabilities to calculate long term ROI. However, recent findings show evidence that people have bounded rationality and bounded willpower. A survey was...

  3. A Causal Entropy Bound

    OpenAIRE

    Brustein, R; Veneziano, G

    1999-01-01

    The identification of a causal-connection scale motivates us to propose a new covariant bound on entropy within a generic space-like region. This "causal entropy bound", scaling as the square root of EV, and thus lying around the geometric mean of Bekenstein's S/ER and holographic S/A bounds, is checked in various "critical" situations. In the case of limited gravity, Bekenstein's bound is the strongest while naive holography is the weakest. In the case of strong gravity, our bound and Bousso...

  4. Rational Efficiency of a Heat Exchanger

    OpenAIRE

    McGovern, Jim; Smyth, Brian P.

    2011-01-01

    The authors propose a new and unique definition for the rational efficiency of a heat exchanger. This new rational efficiency is defined in terms of its sub-rational efficiencies: a heat transfer rational efficiency and a friction rational efficiency for each of the fluid systems comprising the heat exchanger. The heat transfer rational efficiency is based on the definition of a mean temperature for the heat source and a mean temperature for the heat sink and reflects the exergy supplied and ...

  5. A matrix lower bound

    Energy Technology Data Exchange (ETDEWEB)

    Grcar, Joseph F.

    2002-02-04

    A matrix lower bound is defined that generalizes ideas apparently due to S. Banach and J. von Neumann. The matrix lower bound has a natural interpretation in functional analysis, and it satisfies many of the properties that von Neumann stated for it in a restricted case. Applications for the matrix lower bound are demonstrated in several areas. In linear algebra, the matrix lower bound of a full rank matrix equals the distance to the set of rank-deficient matrices. In numerical analysis, the ratio of the matrix norm to the matrix lower bound is a condition number for all consistent systems of linear equations. In optimization theory, the matrix lower bound suggests an identity for a class of min-max problems. In real analysis, a recursive construction that depends on the matrix lower bound shows that the level sets of continuously differential functions lie asymptotically near those of their tangents.

  6. Monodromy Substitutions and Rational Blowdowns

    CERN Document Server

    Endo, Hisaaki; van Horn-Morris, Jeremy

    2010-01-01

    We introduce several new families of relations in the mapping class groups of planar surfaces, each equating two products of right-handed Dehn twists. The interest of these relations lies in their geometric interpretation in terms of rational blowdowns of 4-manifolds, specifically via monodromy substitution in Lefschetz fibrations. The simplest example is the lantern relation, already shown by the first author and Gurtas to correspond to rational blowdown along a -4 sphere; here we give relations that extend that result to realize the "generalized" rational blowdowns of Fintushel-Stern and Park by monodromy subsitution, as well as several of the families of rational blowdowns discovered by Stipsicz-Szab\\'o-Wahl.

  7. Economic rationality and ethical behavior

    OpenAIRE

    Le Menestrel, Marc

    2001-01-01

    This paper argues that economic rationality and ethical behavior cannot be reduced one to the other, casting doubts on the validity of formulas like 'profit is ethical' or 'ethics pays'. In order to express ethical dilemmas as opposing economic interest with ethical concerns, we propose a model of rational behavior that combines these two irreducible dimensions in an open but not arbitrary manner. Behaviors that are neither ethical nor profitable are considered irrational (...

  8. Interpolation of rational matrix functions

    CERN Document Server

    Ball, Joseph A; Rodman, Leiba

    1990-01-01

    This book aims to present the theory of interpolation for rational matrix functions as a recently matured independent mathematical subject with its own problems, methods and applications. The authors decided to start working on this book during the regional CBMS conference in Lincoln, Nebraska organized by F. Gilfeather and D. Larson. The principal lecturer, J. William Helton, presented ten lectures on operator and systems theory and the interplay between them. The conference was very stimulating and helped us to decide that the time was ripe for a book on interpolation for matrix valued functions (both rational and non-rational). When the work started and the first partial draft of the book was ready it became clear that the topic is vast and that the rational case by itself with its applications is already enough material for an interesting book. In the process of writing the book, methods for the rational case were developed and refined. As a result we are now able to present the rational case as an indepe...

  9. Portfolio selection with time constraints and a rational explanation of insufficient diversification and excessive trading

    OpenAIRE

    Dolzer, Armin; Nietert, Bernhard

    2006-01-01

    Private investors have limited time available for learning about stocks as they need to divide their time between stock analysis and work. This paper analyzes the influence of learning constraintsin the form of time constraints on portfolio selection and derives both optimal portfolio holdings and time allocation. Under time constraints, rational private investors make portfolio choices similar to those ofi nvestors with bounded rationality, i.e., insufficient diversification and excessive tr...

  10. Physical Uncertainty Bounds (PUB)

    Energy Technology Data Exchange (ETDEWEB)

    Vaughan, Diane Elizabeth [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Preston, Dean L. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-03-19

    This paper introduces and motivates the need for a new methodology for determining upper bounds on the uncertainties in simulations of engineered systems due to limited fidelity in the composite continuum-level physics models needed to simulate the systems. We show that traditional uncertainty quantification methods provide, at best, a lower bound on this uncertainty. We propose to obtain bounds on the simulation uncertainties by first determining bounds on the physical quantities or processes relevant to system performance. By bounding these physics processes, as opposed to carrying out statistical analyses of the parameter sets of specific physics models or simply switching out the available physics models, one can obtain upper bounds on the uncertainties in simulated quantities of interest.

  11. Asymptotic Entropy Bounds

    CERN Document Server

    Bousso, Raphael

    2016-01-01

    We show that known entropy bounds constrain the information carried off by radiation to null infinity. We consider distant, planar null hypersurfaces in asymptotically flat spacetime. Their focussing and area loss can be computed perturbatively on a Minkowski background, yielding entropy bounds in terms of the energy flux of the outgoing radiation. In the asymptotic limit, we obtain boundary versions of the Quantum Null Energy Condition, of the Generalized Second Law, and of the Quantum Bousso Bound.

  12. Bound soliton fiber laser

    OpenAIRE

    Tang, D. Y.; B. Zhao; Shen, D. Y.; Lu, C.

    2009-01-01

    Experimental study on the soliton dynamics of a passively mode locked fiber ring laser firstly revealed a state of bound soliton operation in the laser, where two solitons bind together tightly with fixed pulse separation. We further report on the properties of the bound-soliton emission of the laser. In particular, we demonstrate both experimentally and numerically that, like the single pulse soliton operation of the laser, the bound soliton emission is another intrinsic feature of the laser.

  13. Rationality in the Cryptographic Model

    DEFF Research Database (Denmark)

    Hubacek, Pavel

    implement correlated equilibria of two-player strategic games in a sequentially rational way. We show that there exist two-player games for which no cryptographic protocol can implement the mediator in a sequentially rational way; that is, without introducing empty threats. In the context of computational......This thesis presents results in the field of rational cryptography. In the first part we study the use of cryptographic protocols to avoid mediation and binding commitment when implementing game theoretic equilibrium concepts. First, we concentrate on the limits of cryptographic cheap talk to...... Nash equilibrium, we classify necessary and sufficient cryptographic assumptions for implementing a mediator that allows to achieve a given utility profile of a correlated equilibrium. Second, we propose a new approach for implementing coarse correlated equilibria, a relaxation of correlated equilibria...

  14. Axioms for Rational Reinforcement Learning

    CERN Document Server

    Sunehag, Peter

    2011-01-01

    We provide a formal, simple and intuitive theory of rational decision making including sequential decisions that affect the environment. The theory has a geometric flavor, which makes the arguments easy to visualize and understand. Our theory is for complete decision makers, which means that they have a complete set of preferences. Our main result shows that a complete rational decision maker implicitly has a probabilistic model of the environment. We have a countable version of this result that brings light on the issue of countable vs finite additivity by showing how it depends on the geometry of the space which we have preferences over. This is achieved through fruitfully connecting rationality with the Hahn-Banach Theorem. The theory presented here can be viewed as a formalization and extension of the betting odds approach to probability of Ramsey and De Finetti.

  15. Rational points on elliptic curves

    CERN Document Server

    Silverman, Joseph H

    2015-01-01

    The theory of elliptic curves involves a pleasing blend of algebra, geometry, analysis, and number theory. This book stresses this interplay as it develops the basic theory, thereby providing an opportunity for advanced undergraduates to appreciate the unity of modern mathematics. At the same time, every effort has been made to use only methods and results commonly included in the undergraduate curriculum. This accessibility, the informal writing style, and a wealth of exercises make Rational Points on Elliptic Curves an ideal introduction for students at all levels who are interested in learning about Diophantine equations and arithmetic geometry. Most concretely, an elliptic curve is the set of zeroes of a cubic polynomial in two variables. If the polynomial has rational coefficients, then one can ask for a description of those zeroes whose coordinates are either integers or rational numbers. It is this number theoretic question that is the main subject of this book. Topics covered include the geometry and ...

  16. Bounded Gaussian process regression

    DEFF Research Database (Denmark)

    Jensen, Bjørn Sand; Nielsen, Jens Brehm; Larsen, Jan

    2013-01-01

    We extend the Gaussian process (GP) framework for bounded regression by introducing two bounded likelihood functions that model the noise on the dependent variable explicitly. This is fundamentally different from the implicit noise assumption in the previously suggested warped GP framework. We...

  17. Bounding the number of points on a curve using a generalization of Weierstrass semigroups

    DEFF Research Database (Denmark)

    Beelen, Peter; Ruano, Diego

    2013-01-01

    In this article we use techniques from coding theory to derive upper bounds for the number of rational places of the function field of an algebraic curve defined over a finite field. The used techniques yield upper bounds if the (generalized) Weierstrass semigroup (J Pure Appl Algebra 207(2), 243...

  18. Graviton Mass Bounds

    CERN Document Server

    de Rham, Claudia; Tolley, Andrew J; Zhou, Shuang-Yong

    2016-01-01

    Recently, aLIGO has announced the first direct detections of gravitational waves, a direct manifestation of the propagating degrees of freedom of gravity. The detected signals GW150914 and GW151226 have been used to examine the basic properties of these gravitational degrees of freedom, particularly setting an upper bound on their mass. It is timely to review what the mass of these gravitational degrees of freedom means from the theoretical point of view, particularly taking into account the recent developments in constructing consistent massive gravity theories. Apart from the GW150914 mass bound, a few other observational bounds have been established from the effects of the Yukawa potential, modified dispersion relation and fifth force that are all induced when the fundamental gravitational degrees of freedom are massive. We review these different mass bounds and examine how they stand in the wake of recent theoretical developments and how they compare to the bound from GW150914.

  19. Rational Polytherapy with Antiepileptic Drugs

    Directory of Open Access Journals (Sweden)

    Jong Woo Lee

    2010-07-01

    Full Text Available Approximately 30–40% of patients do not achieve seizure control with a single antiepileptic drug (AED. With the advent of multiple AEDs in the past 15 years, rational polytherapy, the goal of finding combinations of AEDs that have favorable characteristics, has become of greater importance. We review the theoretical considerations based on AED mechanism of action, animal models, human studies in this field, and the challenges in finding such optimal combinations. Several case scenarios are presented, illustrating examples of rational polytherapy.

  20. Ventilation, good indoor air quality and rational use of energy

    DEFF Research Database (Denmark)

    Clausen, Geo; Fernandes, E. D. O.; DeGids, W.; Delmotte, C.; Hanssen, S. O.; Kephalopoulos, S.; Lemaire, M. C.; Lindvall, T.; Nicol, F.; Santamouris, M.; Seppannen, O.; VanDenBogaard, C.; Wilson, M.; Wouters, P.

    2003-01-01

    The aim of this report is to provide information and advice to policy and decission makers, researchers, architects, designers, and manufacturers on strategies for achieving a good balance between good indoor air quality (IAQ) and the rational use of Energy in buildings, available guidelines and...... assessment techniques on energy and IAQ, significant trends for the future with implications for IAQ and the use of energy in buildings; and an indication of current research issues...

  1. RATIONAL EXPECTATIONS AND MONETARY THEORY: AN INVESTIGATIVE PAPER[1960 - 1989

    OpenAIRE

    DR. GODWIN CHUKWUDUM NWAOBI

    2005-01-01

    SINCE 1930, EXPECTATIONS HAVE PLAYED AN IMPORTANT ROLE IN ECONOMIC THEORY AND THIS IS BECAUSE ECONOMICS IS GENERALLY CONCERNED WITH THE IMPLICATIONS OF CURRENT ACTIONS FOR THE FUTURE. THIS PAPER THEREFORE ARGUES THAT THE DEVELOPMENT OF RATIONAL EXPECTATIONS THEORY WILL MAKE A MORE SIGNIFICANT CONTRIBUTION TO ECONOMICS(AND IN PARTICULAR, MONETARY ECONOMICS) IN THE IMPETUS IT GIVES TO RESEARCH ON THE VITAL AREAS OF LEARNING AND PRICE EXPECTATIONS FORMATION

  2. Reliability and rationing cost in a power system

    OpenAIRE

    N. Vijayamohanan Pillai

    2002-01-01

    An attempt is made to analyse the implications of the relationship between reliability and rationing cost involved in a power supply system in the framework of the standard inventory analysis, instead of the conventional marginalist approach of welfare economics. The study is substantiated by fitting a normal distribution to the daily internal maximum demand of the Kerala power system during 1995-96, and also by estimating, based on the techno-economic parameters of different types of power p...

  3. Deeply bound pionic atom

    International Nuclear Information System (INIS)

    The standard method of pionic atom formation does not produce deeply bound pionic atoms. A study is made on the properties of deeply bound pionic atom states by using the standard pion-nucleus optical potential. Another study is made to estimate the cross sections of the formation of ls pionic atom states by various methods. The pion-nucleus optical potential is determined by weakly bound pionic atom states and pion nucleus scattering. Although this potential may not be valid for deeply bound pionic atoms, it should provide some hint on binding energies and level widths of deeply bound states. The width of the ls state comes out to be 0.3 MeV and is well separated from the rest. The charge dependence of the ls state is investigated. The binding energies and the widths increase linearly with Z azbove a Z of 30. The report then discusses various methods to populate deeply bound pionic atoms. In particular, 'pion exchange' reactions are proposed. (n, pπ) reaction is discussed first. The cross section is calculated by assuming the in- and out-going nucleons on-shell and the produced pion in (n1) pionic atom states. Then, (n, dπ-) cross sections are estimated. (p, 2Heπ-) reaction would have cross sections similar to the cross section of (n, dπ-) reaction. In conclusion, it seems best to do (n, p) experiment on heavy nuclei for deeply bound pionic atom. (Nogami, K.)

  4. Teaching Rational Decision-Making.

    Science.gov (United States)

    Woolever, Roberts

    1978-01-01

    Presented is an outline of a college course, "Education in American Society," that focused on teaching students rational decision-making skills while examining current issues in American Education. The outline is followed by student comments, reactions, and evaluations of the course. (JMD)

  5. Frobenius groups and retract rationality

    CERN Document Server

    Kang, Ming-chang

    2012-01-01

    Let $k$ be any field, $G$ be a finite group acting on the rational function field $k(x_g:g\\in G)$ by $h\\cdot x_g=x_{hg}$ for any $h,g\\in G$. Define $k(G)=k(x_g:g\\in G)^G$. Noether's problem asks whether $k(G)$ is rational (= purely transcendental) over $k$. A weaker notion, retract rationality introduced by Saltman, is also very useful for the study of Noether's problem. We prove that, if $G$ is a Frobenius group with abelian Frobenius kernel, then $k(G)$ is retract $k$-rational for any field $k$ satisfying some mild conditions. As an application, we show that, for any algebraic number field $k$, for any Frobenius group $G$ with Frobenius complement isomorphic to $SL_2(\\bm{F}_5)$, there is a Galois extension field $K$ over $k$ whose Galois group is isomorphic to $G$, i.e. the inverse Galois problem is valid for the pair $(G,k)$. The same result is true for any non-solvable Frobenius group if $k(\\zeta_8)$ is a cyclic extension of $k$.

  6. Rational Suicide among the Elderly.

    Science.gov (United States)

    Humphry, Derek

    1992-01-01

    Contends that old age, in and of itself, should never need to be a cause for self-destruction. Further argues that suicide and assisted suicide carried out in the face of terminal illness causing unbearable suffering should be ethically and legally acceptable. Outlines a perspective on rational suicide among the elderly. (Author/NB)

  7. Generalized Sphere Packing Bound

    OpenAIRE

    Fazeli, Arman; Vardy, Alexander; Yaakobi, Eitan

    2014-01-01

    Kulkarni and Kiyavash recently introduced a new method to establish upper bounds on the size of deletion-correcting codes. This method is based upon tools from hypergraph theory. The deletion channel is represented by a hypergraph whose edges are the deletion balls (or spheres), so that a deletion-correcting code becomes a matching in this hypergraph. Consequently, a bound on the size of such a code can be obtained from bounds on the matching number of a hypergraph. Classical results in hyper...

  8. Proper Reparametrization of Rational Ruled Surface

    Institute of Scientific and Technical Information of China (English)

    Jia Li; Li-Yong Shen; Xiao-Shan Gao

    2008-01-01

    In this paper, we present a proper reparametrization algorithm for rational ruled surfaces. That is, for an improper rational parametrization of a ruled surface, we construct a proper rational parametrization for the same surface. The algorithm consists of three steps. We first reparametrize the improper rational parametrization caused by improper supports. Then the improper rational parametrization is transformed to a new one which is proper in one of the parameters. Finally, the problem is reduced to the proper reparametrization of planar rational algebraic curves.

  9. Deeply bound pionic states

    International Nuclear Information System (INIS)

    We discuss the structure and formation of deeply bound π- states in heavy nuclei, which are expected to be narrow due to the repulsive π--nucleus interaction. Possible experiments to produce those states are described. (author)

  10. Love and rationality: on some possible rational effects of love

    Directory of Open Access Journals (Sweden)

    Gustavo Ortiz-Millán

    2007-01-01

    Full Text Available In this paper I defend the idea that rather than disrupting rationality, as the common-sense conception has done it, love may actually help us to develop rational ways of thinking and acting. I make the case for romantic or erotic love, since this is the kind of love that is more frequently associated with irrationality in acting and thinking. I argue that this kind of love may make us develop epistemic and practical forms of rationality. Based on an analysis of its characteristic action tendencies, I argue that love may help us to develop an instrumental form of rationality in determining the best means to achieve the object of love. It may also narrow down the number of practical considerations that may help us to achieve our goals. Finally, love may generate rational ways of belief-formation by framing the parameters taken into account in perception and attention, and by bringing into light only a small portion of the epistemic information available. Love may make us perceive reality more acutely.Neste artigo defendo a idéia de que, em vez de perturbar a racionalidade, como a concepção do senso comum o faz, o amor pode, na verdade, ajudar-nos a desenvolver modos racionais de pensar e agir. Dou bons argumentos para o amor romântico ou erótico, uma vez que esse é o tipo de amor que é mais freqüentemente associado à irracionalidade no agir e no pensar. Argumento que esse tipo de amor pode fazer-nos desenvolver formas epistêmicas e práticas de racionalidade. Com base em uma análise de suas tendências características para a ação, argumento que o amor pode ajudar-nos a desenvolver uma forma instrumental de racionalidade para se determinar o melhor meio de atingir o objeto de amor. Ele também pode limitar o número de considerações práticas que podem ajudar-nos a atingir os nossos objetivos. Finalmente, o amor pode gerar modos racionais de formação de crenças ao estruturar os parâmetros considerados na percepção e na aten

  11. Refugee Quota Trading within the Context of EU-ENP Cooperation: Rational, Bounded Rational and Ethical Critiques

    OpenAIRE

    Mollie Gerver

    2013-01-01

    In 1997 Peter Schuck proposed a 'refugee quota trading' mechanism, whereby countries voluntarily form a union, each country accepting a quota of refugees and able to buy and sell the quota to other states within and even outside of the union. Today, the EU arguably has a de facto cash transfer mechanism both within the EU and between the EU and European Neighbourhood Policy countries. This article explores the question of refugee quota trading, explaining why current EU policy fails to increa...

  12. WAVELET RATIONAL FILTERS AND REGULARITY ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    Zheng Kuang; Ming-gen Cui

    2000-01-01

    In this paper, we choose the trigonometric rational functions as wavelet filters and use them to derive various wavelets. Especially for a certain family of wavelets generated by the rational filters, the better smoothness results than Daubechies' are obtained.

  13. THE ALGEBRAIC METHOD OF RATIONAL INTERPOLATION

    Institute of Scientific and Technical Information of China (English)

    Cai Shoufeng; Zhang Shugong

    2005-01-01

    This paper deals with rational interpolation. From algebraic viewpoint, we present an algebraic formulation of rational interpolation and discuss the existence of the interpolation function. Finally an algorithm for univariate case and an example are presented.

  14. Rationality, mental causation and social sciences

    Directory of Open Access Journals (Sweden)

    Mladenović Ivan

    2009-01-01

    Full Text Available The aim of this paper is to investigate the role of mental causation in the context of rational choice theory. The author defends psychological aspect of rational explanation against the challenge of contemporary reductive materialism.

  15. Rational maps, monopoles and skyrmions

    International Nuclear Information System (INIS)

    We discuss the similarities between BPS monopoles and skyrmions, and point to an underlying connection in terms of rational maps between Riemann spheres. This involves the introduction of a new ansatz for Skyrme fields. We use this to construct good approximations to several known skyrmions, including all the minimal energy configurations up to baryon number nine, and some new solutions such as a baryon number seventeen Skyrme field with the truncated icosahedron structure of a buckyball. The new approach is also used to understand the low-lying vibrational modes of skyrmions, which are required for quantization. Along the way we discover an interesting Morse function on the space of rational maps which may be of use in understanding the Sen forms on the monopole moduli spaces. (orig.)

  16. Learning rational temporal eye movement strategies.

    Science.gov (United States)

    Hoppe, David; Rothkopf, Constantin A

    2016-07-19

    During active behavior humans redirect their gaze several times every second within the visual environment. Where we look within static images is highly efficient, as quantified by computational models of human gaze shifts in visual search and face recognition tasks. However, when we shift gaze is mostly unknown despite its fundamental importance for survival in a dynamic world. It has been suggested that during naturalistic visuomotor behavior gaze deployment is coordinated with task-relevant events, often predictive of future events, and studies in sportsmen suggest that timing of eye movements is learned. Here we establish that humans efficiently learn to adjust the timing of eye movements in response to environmental regularities when monitoring locations in the visual scene to detect probabilistically occurring events. To detect the events humans adopt strategies that can be understood through a computational model that includes perceptual and acting uncertainties, a minimal processing time, and, crucially, the intrinsic costs of gaze behavior. Thus, subjects traded off event detection rate with behavioral costs of carrying out eye movements. Remarkably, based on this rational bounded actor model the time course of learning the gaze strategies is fully explained by an optimal Bayesian learner with humans' characteristic uncertainty in time estimation, the well-known scalar law of biological timing. Taken together, these findings establish that the human visual system is highly efficient in learning temporal regularities in the environment and that it can use these regularities to control the timing of eye movements to detect behaviorally relevant events. PMID:27382164

  17. Rational Students and Resit Exams

    OpenAIRE

    Kooreman, Peter

    2012-01-01

    Resit exams - extra opportunities to do an exam in the same academic year - are widely prevalent in European higher education, but uncommon in the US. I present a simple theoretical model to compare rational student behavior in the case of only one exam opportunity versus the case of two exam opportunities. Numerical examples for a wide range of plausible parameter values show that a second exam opportunity increases the ultimate passing probability only slightly, but strongly reduces average...

  18. On Quantum Integers and Rationals

    OpenAIRE

    Le Stum, Bernard; Quirós, Adolfo

    2013-01-01

    ISBN: 978-0-8218-9858-1 International audience We introduce the notions of quantum characteristic and quantum flatness for arbitrary rings. More generally, we develop the theory of quantum integers in a ring and show that the hypothesis of quantum flatness together with positive quantum characteristic generalizes the usual notion of prime positive characteristic. We also explain how one can define quantum rational numbers in a ring and introduce the notion of twisted powers. These resul...

  19. Rational Expectation Can Preclude Trades

    OpenAIRE

    Matsuhisa, Takashi; Ishikawa, Ryuichiro

    2003-01-01

    We consider a pure exchange economy under uncertainty in which the traders have the non-partition structure of information. They willing to trade the amounts of state-contingent commodities and they know their own expectations. Common knowledge of these conditions among all the traders can preclude trade if the initial endowments allocation is ex-ante Pareto optimal. Furthermore we introduce rational expectations equilibrium under the non-partition information, and prove the existence theorem...

  20. Rational Bias in Inflation Expectations

    OpenAIRE

    Robert G. Murphy; Adam Rohde

    2014-01-01

    This paper argues that individuals may rationally weight price increases for food and energy products differently from their expenditure shares when forming expectations about price inflation. We develop a simple dynamic model of the economy with gradual price adjustment in the "core" (non-food, non-energy) sector and flexible prices in the food and energy sectors. Serial correlation of supply shocks to the food and energy sectors allows individuals to gain an understanding about future shock...

  1. Rational Asset Pricing Bubbles Revisited

    OpenAIRE

    Jan Werner

    2012-01-01

    Price bubble arises when the price of an asset exceeds the asset's fundamental value, that is, the present value of future dividend payments. The important result of Santos and Woodford (1997) says that price bubbles cannot exist in equilibrium in the standard dynamic asset pricing model with rational agents as long as assets are in strictly positive supply and the present value of total future resources is finite. This paper explores the possibility of asset price bubbles when either one of ...

  2. Optimally Rational Expectations and Macroeconomics

    OpenAIRE

    David Demery; Nigel Duck

    2002-01-01

    This paper provides an alternative to the theory of rational expectations (RE). Its central idea is that the information set on which agents will choose to condition their expectations will not, in general, include all the available information. Our alternative has many of the attractive features of RE; it emerges from an explicit choice-theoretic framework; it has wide applicability; and it can in principle explain the failure of models incorporating RE to account for the dynamics of many ma...

  3. Nevanlinna Theory and Rational Points

    OpenAIRE

    Noguchi, Junjiro

    1996-01-01

    S. Lang conjectured in 1974 that a hyperbolic algebraic variety defined over a number field has only finitely many rational points, and its analogue over function fields. We discuss the Nevanlinna-Cartan theory over function fields of arbitrary dimension and apply it for Diophantine property of hyperbolic projective hypersurfaces (homogeneous Diophantine equations) constructed by Masuda-Noguchi. We also deal with the finiteness property of $S$-units points of those Diophantine equations over ...

  4. Judgment aggregation without full rationality

    OpenAIRE

    Dietrich, Franz; List, Christian

    2007-01-01

    Several recent results on the aggregation of judgments over logically connected propositions show that, under certain conditions, dictatorships are the only independent (i.e., propositionwise) aggregation rules generating fully rational (i.e., complete and consistent) collective judgments. A frequently mentioned route to avoid dictatorships is to allow incomplete collective judgments. We show that this route does not lead very far: we obtain (strong) oligarchies rather than dictatorships if i...

  5. Davidson on Turing: Rationality Misunderstood?

    Directory of Open Access Journals (Sweden)

    John-Michael Kuczynski

    2005-12-01

    Full Text Available Alan Turing advocated a kind of functionalism: A machine M is a thinker provided that it responds in certain ways to certain inputs. Davidson argues that Turing’s functionalism is inconsistent with a cer-tain kind of epistemic externalism, and is therefore false. In Davidson’s view, concepts consist of causal liasons of a certain kind between subject and object. Turing’s machine doesn’t have the right kinds of causal li-asons to its environment. Therefore it doesn’t have concepts. Therefore it doesn’t think. I argue that this reasoning is entirely fallacious. It is true that, in some cases, a causal liason between subject and object is part of one’s concept of that object. Consequently, to grasp certain propositions, one must have certain kids of causal ties to one’s environment. But this means that we must rethink some old views on what rationality is. It does not mean, pace Davidson, that a precondition for being rational is being causally embedded in one’s environment in a certain way. If Tur-ing’s machine isn’t capable of thinking (I leave it open whether it is or is not, that has nothing to do with its lacking certain kinds of causal con-nections to the environment. The larger significance of our discussion is this: rationality consists either in one’s ability to see the bearing of purely existential propositions on one another or rationality is simply not to be understood as the ability see the bearing that propositions have on one another.

  6. A rational approach to dementia.

    OpenAIRE

    Cole, M G

    1980-01-01

    Dementia is a common problem facing all medical practitioners and it frequently results in hospitalization and death. This review provides a framework for dealing with dementia in clinical practice that is based on both traditional concepts and recent advances in the understanding of the problem. Distinguishing at the bedside between dementia and other disorders of intellect is emphasized. The main causes of dementia and their clinical characteristics are reviewed and a rational approach to d...

  7. Rationality, irrationality and economic cognition

    OpenAIRE

    Whalley, John

    2005-01-01

    This paper contrasts the modern use of the assumption that rationality guides individual economic behaviour, as reflected in simple models of utility and profit maximization, to literature between 1890 and 1930 which sharply challenged the use of such an assumption, as well as to later literature in economic psychology from Herbert Simon onwards which sees economic (and other) cognitive processes in different ways. Some of the earlier literature proposed objective and operational notions of r...

  8. Psychology and the Rationality of Emotion*

    OpenAIRE

    Clore, Gerald L.

    2011-01-01

    Questions addressed by recent psychological research on emotion include questions about how thought shapes emotion and how emotion, in turn, shapes thought. Research on emotion and cognition paints a somewhat different picture than that seen in traditional discussions of passion and reason. This article reviews several aspects of this research, concentrating specifically on three views of rationality: Rationality as Process, Rationality as Product, and Rationality as Outcome.

  9. Capital theory and rational choice

    Directory of Open Access Journals (Sweden)

    Golubović Nataša

    2009-01-01

    Full Text Available Almost from the very beginning of economic science the notion of capital has been the subject of numerous controversies. The main reason for the concept's controversial nature is that it explains interest and profit. In Marxian theory, where 'manner of production' determines forms of activities, mutual relationships and life of individuals, capital appears as a social phenomenon i.e. social relation. Goods and money are not capital by themselves but become capital in the capitalist way of production. Economics mainstream is based on methodological individualism upon which explanation of social phenomena and processes must be derived from individual behavior and motivation. Capital, therefore, is not a product of capitalism as a socially and historically specific form of economic organization, but is rather perceived as connected to the individual and his or her rational behavior. Rational choice is the basic and sometimes the only explanatory factor in the neoclassic theories of capital. Although theories of human and cultural capital point out the interdependence between individual activity and choice on the one hand, and social position on the other hand in the process of capitalization, the connection remains in the background and somehow unclear. A more explicit indication of the interdependence between social structure and choice can be found in the theory of social capital. The goal of this paper is to explore the role of rational choice theory in explaining the nature of capital.

  10. A Critical Analysis of Rational & Emotional Approaches in Car Selling

    Directory of Open Access Journals (Sweden)

    Krishn A. Goyal

    2010-12-01

    Full Text Available A well known fact is that investment in a Car is the costliest investment made in a life time only next to construction of a house, for any human being. It is a common knowledge that all of us are attracted towards cars right from childhood and we have developed our own perceptions for cars. When we acquire the capacity to buy cars, our experience of buying, involves both emotional and rational aspects which lead to a purchase decision. Unlike other consumable durables, the decision to buy specific brand of Car is shaped over a long period of time. The period between recognition of need to buy a car and the actual purchase may run into many weeks or even months. Considerable research has focussed on conceptually and operationally defining various factors that lead to a purchase decision. However, because of the inherent difficulties in deciphering consumer behaviour coupled with exponential changes in consumer aspirations, there is a need to constantly re-define our perceptions about consumer behaviour. Revealed Preference Theory of Samuelson & Bounded rationality Theory of Herbert Simon and many others have provided a conceptual analysis of Consumer Behaviour from the perspective of economics, we have still not been able to pinpoint whether consumers are Rational or Emotional when it comes to buying Cars. “ According to some early economic theorists (e.g., Adam Smith, Jeremy Bentham, Alfred Marshall, man’s/woman’s desire for goods and services exceed his/her ability to pay. Therefore, buying decisions are made through a rational process during which we assign a value to each desired product or service offering based upon our assessment of the ability of that offering to satisfy our needs and desires. This want satisfying ability is termed “utility.” As different offerings possess different levels of utility, rational behavior dictates that one seek to maximize utility.

  11. Rational Thinking in School-Based Practice

    Science.gov (United States)

    Clark, Mary Kristen; Flynn, Perry

    2011-01-01

    Purpose: We reflect on Alan Kamhi's (2011) prologue on balancing certainty and uncertainty as it pertains to school-based practice. Method: In schools, rational thinking depends on effective team processes, much like professional learning communities. We consider the conditions that are required for rational thinking and how rational team dialogue…

  12. Fuzzy Syntactic Congruence and Rational Fuzzy Languages

    Institute of Scientific and Technical Information of China (English)

    SHU Lan; PENG Jia-yin

    2002-01-01

    In this paper the notion of rational fuzzy language is introduced, and a theorem is obtained: a fuzzy subset of ∑ * is recognizable if and only if it's rational. The result connects the rational fuzzy language with fuzzy finite-state automaton language.

  13. Rational Solutions in a Coupled Burgers System

    Institute of Scientific and Technical Information of China (English)

    HUANG Ling

    2006-01-01

    Three types of the rational solutions for a new coupled Burgers system are studied in detail in terms of the reduction and decoupled procedures. The first two types of rational solutions are singular and valid for one type of model parameter c>0, and another type of rational solutions is nonsingular at any type and valid for another type of model parameter c<0.

  14. Rationality and the Logic of Good Reasons.

    Science.gov (United States)

    Fisher, Walter R.

    This paper contends that the rationality of the logic of good reasons is constituted in its use. To support this claim, the paper presents an analysis of the relationship between being reasonable and being rational. It then considers how following the logic of good reasons leads to rationality in the behavior of individuals and groups; the latter…

  15. Lectures on Bound states

    CERN Document Server

    Hoyer, Paul

    2016-01-01

    Even a first approximation of bound states requires contributions of all powers in the coupling. This means that the concept of "lowest order bound state" needs to be defined. In these lectures I discuss the "Born" (no loop, lowest order in $\\hbar$) approximation. Born level states are bound by gauge fields which satisfy the classical field equations. As a check of the method, Positronium states of any momentum are determined as eigenstates of the QED Hamiltonian, quantized at equal time. Analogously, states bound by a strong external field $A^\\mu(\\xv)$ are found as eigenstates of the Dirac Hamiltonian. Their Fock states have dynamically created $e^+e^-$ pairs, whose distribution is determined by the Dirac wave function. The linear potential of $D=1+1$ dimensions confines electrons but repels positrons. As a result, the mass spectrum is continuous and the wave functions have features of both bound states and plane waves. The classical solutions of Gauss' law are explored for hadrons in QCD. A non-vanishing bo...

  16. Bounding species distribution models

    Institute of Scientific and Technical Information of China (English)

    Thomas J. STOHLGREN; Catherine S. JARNEVICH; Wayne E. ESAIAS; Jeffrey T. MORISETTE

    2011-01-01

    Species distribution models are increasing in popularity for mapping suitable habitat for species of management concern.Many investigators now recognize that extrapolations of these models with geographic information systems (GIS) might be sensitive to the environmental bounds of the data used in their development,yet there is no recommended best practice for “clamping” model extrapolations.We relied on two commonly used modeling approaches:classification and regression tree (CART) and maximum entropy (Maxent) models,and we tested a simple alteration of the model extrapolations,bounding extrapolations to the maximum and minimum values of primary environmental predictors,to provide a more realistic map of suitable habitat of hybridized Africanized honey bees in the southwestern United States.Findings suggest that multiple models of bounding,and the most conservative bounding of species distribution models,like those presented here,should probably replace the unbounded or loosely bounded techniques currently used [Current Zoology 57 (5):642-647,2011].

  17. Kodiak: An Implementation Framework for Branch and Bound Algorithms

    Science.gov (United States)

    Smith, Andrew P.; Munoz, Cesar A.; Narkawicz, Anthony J.; Markevicius, Mantas

    2015-01-01

    Recursive branch and bound algorithms are often used to refine and isolate solutions to several classes of global optimization problems. A rigorous computation framework for the solution of systems of equations and inequalities involving nonlinear real arithmetic over hyper-rectangular variable and parameter domains is presented. It is derived from a generic branch and bound algorithm that has been formally verified, and utilizes self-validating enclosure methods, namely interval arithmetic and, for polynomials and rational functions, Bernstein expansion. Since bounds computed by these enclosure methods are sound, this approach may be used reliably in software verification tools. Advantage is taken of the partial derivatives of the constraint functions involved in the system, firstly to reduce the branching factor by the use of bisection heuristics and secondly to permit the computation of bifurcation sets for systems of ordinary differential equations. The associated software development, Kodiak, is presented, along with examples of three different branch and bound problem types it implements.

  18. Validation of EMP bounds

    Energy Technology Data Exchange (ETDEWEB)

    Warne, L.K.; Merewether, K.O.; Chen, K.C.; Jorgenson, R.E.; Morris, M.E.; Solberg, J.E.; Lewis, J.G. [Sandia National Labs., Albuquerque, NM (United States); Derr, W. [Derr Enterprises, Albuquerque, NM (United States)

    1996-07-01

    Test data on canonical weapon-like fixtures are used to validate previously developed analytical bounding results. The test fixtures were constructed to simulate (but be slightly worse than) weapon ports of entry but have known geometries (and electrical points of contact). The exterior of the test fixtures exhibited exterior resonant enhancement of the incident fields at the ports of entry with magnitudes equal to those of weapon geometries. The interior consisted of loaded transmission lines adjusted to maximize received energy or voltage but incorporating practical weapon geometrical constraints. New analytical results are also presented for bounding the energies associated with multiple bolt joints and for bounding the exterior resonant enhancement of the exciting fields.

  19. Generalized Skyrme model with the loosely bound potential

    CERN Document Server

    Gudnason, Sven Bjarke; Ma, Nana

    2016-01-01

    We study a generalization of the loosely bound Skyrme model which consists of the Skyrme model with a sixth-order derivative term and the second-order loosely bound potential. We use the rational map approximation for the 4-Skyrmion and calculate the binding energy and estimate the systematic error in using the latter approximation. In the parameter space that we can explore within the rational map approximation, we find classical binding energies as low as 1.8% and once taking into account the contribution from spin-isospin quantization we obtain binding energies as low as 5.3%. We also calculate the contribution from the sixth-order derivative term to the electric charge density and axial coupling.

  20. Trajectory based models. Evaluation of minmax pricing bounds

    OpenAIRE

    Degano, Ivan; Ferrando, Sebastian; Gonzalez, Alfredo

    2015-01-01

    The paper studies market models based on trajectory spaces, properties of such models are obtained without recourse to probabilistic assumptions. For a given European option, an interval of rational prices exists under a more general condition than the usual no-arbitrage requirement. The paper develops computational results in order to evaluate the option bounds; the global minmax optimization, defining the price interval, is reduced to a local minmax optimization via dynamic programming. A g...

  1. Bounded variation and around

    CERN Document Server

    Appell, Jürgen; Merentes Díaz, Nelson José

    2013-01-01

    This monographis a self-contained exposition of the definition and properties of functionsof bounded variation and their various generalizations; the analytical properties of nonlinear composition operators in spaces of such functions; applications to Fourier analysis, nonlinear integral equations, and boundary value problems. The book is written for non-specialists. Every chapter closes with a list of exercises and open problems.

  2. Corporate rationalization of American health care: a visitor's appraisal.

    Science.gov (United States)

    Pollitt, C

    1982-01-01

    This paper uses elements of the macrotheory of advanced capitalist societies developed by Jurgen Habermas and other "critical theorists" to locate and explore the implications of the containing corporatization of the U.S. health care sector. It questions the often-dominant view that cost is the major problem of current U.S. arrangements, and shows how most recent government policies have reinforced the corporate rationalization of health care, or at least proved neutral towards it. Yet it can be argued that it is precisely this "rationalization" which renders more difficult both cost-control and the much-needed broadening of the agenda of the health care debate to important issues other than cost. PMID:7108167

  3. Competency to stand trial: rationalism, "contextualism" and other modest theories.

    Science.gov (United States)

    Jan Brakel, S

    2003-01-01

    Determinations of competency to stand trial in criminal cases are complicated and rendered unpredictable by two sub-surface issues that are rarely articulated: (i) the place of the defendant's rationality in the substantive standard(s) for competency and (ii) the level or degree of incompetency required to stop the criminal process. The rare references to these issues, mostly indirect, that are made in the cases, commentary, and competency testing instruments devised (including those civil as well as criminal) are examined. The conclusion that emerges is that the level of capacity and rationality required of the defendant depends much on context-the type of case, its relative complexity, and the values and stakes implicated in the outcome. PMID:12808691

  4. Asynchronous Bounded Expected Delay Networks

    OpenAIRE

    Bakhshi, Rena; Endrullis, Jörg; Fokkink, Wan; Pang, Jun

    2010-01-01

    The commonly used asynchronous bounded delay (ABD) network models assume a fixed bound on message delay. We propose a probabilistic network model, called asynchronous bounded expected delay (ABE) model. Instead of a strict bound, the ABE model requires only a bound on the expected message delay. While the conditions of ABD networks restrict the set of possible executions, in ABE networks all asynchronous executions are possible, but executions with extremely long delays are less probable. In ...

  5. On Entropy Bounds and Holography

    CERN Document Server

    Halyo, Edi

    2009-01-01

    We show that the holographic entropy bound for gravitational systems and the Bekenstein entropy bound for nongravitational systems are holographically related. Using the AdS/CFT correspondence, we find that the Bekenstein bound on the boundary is obtained from the holographic bound in the bulk by minimizing the boundary energy with respect the AdS radius or the cosmological constant. This relation may also ameliorate some problems associated with the Bekenstein bound.

  6. Reappraisal of Rational Choice Theory

    Directory of Open Access Journals (Sweden)

    Katalin Martinas

    2013-01-01

    Full Text Available The value of rational choice theory (RCT for the social sciences has long been contested. Much time has been spent by economists and critics on the pervasive but elusive concept of rationality. The critiques mainly challenge the basis of the utility theorem. Several articles on the misuse of mathematics in economics have already appeared in the literature. As N. Bouleau stated, “On several occasions, however, one feels that the criticism is that the math is being misused and should be developed in some other direction (e.g. a statistical analysis of the financial tendencies that polarize wealth and income, or a study of the positive feedback mechanisms, etc.. This leaves certain dissatisfaction – on a philosophical level.” The aim of this paper is to present a decision theory, yields intention (logos and valuation (existence. Here we present a new mathematical representation of RCT, which leads to a dynamic economic theory. We discuss the philosophical or meta-economical problems, which are needed for the successful applications of mathematics.

  7. Distributive properties of the rationals

    CERN Document Server

    Zelator, Konstantine

    2009-01-01

    If o and * are two binary operations in a number system, then three elements a,b,c in that number system are said to satisfy the distributive property of the operation o over the operation * if, ao(b*c)= (aob)*(aoc) Now, suppose that the number system is the rationals,and the operations o and * are among the four usual operations of addition, multiplication, subtraction, and division. If we allow for o and * to be the same operation, then there are precisely 16 combinations with the operation o being one of the four usual operations in Q; and likewise for the operation *. Two of these 16 combinations are when o is the multiplication operationand * being the addition operation; and when is o is multiplication and * is subtraction. For these two combinations, the above stated distributive property is universally satisfied; that is, for ane three rational numbers a,b,and c. In this work, we examine the other fourteen combinations, to find out when the distributive property is satisfied. Of these 14 combinations ...

  8. Rational self-affine tiles

    CERN Document Server

    Steiner, Wolfgang

    2012-01-01

    An integral self-affine tile is the solution of a set equation $\\mathbf{A} \\mathcal{T} = \\bigcup_{d \\in \\mathcal{D}} (\\mathcal{T} + d)$, where $\\mathbf{A}$ is an $n \\times n$ integer matrix and $\\mathcal{D}$ is a finite subset of $\\mathbb{Z}^n$. In the recent decades, these objects and the induced tilings have been studied systematically. We extend this theory to matrices $\\mathbf{A} \\in \\mathbb{Q}^{n \\times n}$. We define rational self-affine tiles as compact subsets of the open subring $\\mathbb{R}^n\\times \\prod_\\mathfrak{p} K_\\mathfrak{p}$ of the ad\\'ele ring $\\mathbb{A}_K$, where the factors of the (finite) product are certain $\\mathfrak{p}$-adic completions of a number field $K$ that is defined in terms of the characteristic polynomial of $\\mathbf{A}$. Employing methods from classical algebraic number theory, Fourier analysis in number fields, and results on zero sets of transfer operators, we establish a general tiling theorem for these tiles. We also associate a second kind of tiles with a rational matr...

  9. Bounded Tamper Resilience

    DEFF Research Database (Denmark)

    Damgård, Ivan Bjerre; Faust, Sebastian; Mukherjee, Pratyay; Venturi, Daniele

    Related key attacks (RKAs) are powerful cryptanalytic attacks where an adversary can change the secret key and observe the effect of such changes at the output. The state of the art in RKA security protects against an a-priori unbounded number of certain algebraic induced key relations, e...... bounded tamper and leakage resilient CCA secure public key cryptosystem based on the DDH assumption. We first define a weaker CPA-like security notion that we can instantiate based on DDH, and then we give a general compiler that yields CCA-security with tamper and leakage resilience. This requires a...... public tamper-proof common reference string. Finally, we explain how to boost bounded tampering and leakage resilience (as in 1. and 2. above) to continuous tampering and leakage resilience, in the so-called floppy model where each user has a personal hardware token (containing leak- and tamper...

  10. Deeply bound $\\Xi$ tribaryon

    CERN Document Server

    Garcilazo, H

    2016-01-01

    We have used realistic local interactions based on the recent update of the strangeness $-2$ Nijmegen ESC08c potential to calculate the bound state problem of the $\\Xi NN$ system in the $(I)J^P=(\\frac{1}{2})\\frac{3}{2}^+$ state. We found that this system presents a deeply bound state lying $13.5$ MeV below the $\\Xi d$ threshold. Since in lowest order, pure S$-$wave configuration, this system can not decay into the open $\\Lambda\\Lambda N$ channel, its decay width is expected to be very small. We have also recalculated the $(I)J^P=(\\frac{3}{2})\\frac{1}{2}^+$ state and we have compared with results of quark-model based potentials.

  11. Petawatt laser absorption bounded

    CERN Document Server

    Levy, Matthew C; Tabak, Max; Libby, Stephen B; Baring, Matthew G

    2014-01-01

    The interaction of petawatt ($10^{15}\\ \\mathrm{W}$) lasers with solid matter forms the basis for advanced scientific applications such as table-top particle accelerators, ultrafast imaging systems and laser fusion. Key metrics for these applications relate to absorption, yet conditions in this regime are so nonlinear that it is often impossible to know the fraction of absorbed light $f$, and even the range of $f$ is unknown. Here using a relativistic Rankine-Hugoniot-like analysis, we show for the first time that $f$ exhibits a theoretical maximum and minimum. These bounds constrain nonlinear absorption mechanisms across the petawatt regime, forbidding high absorption values at low laser power and low absorption values at high laser power. For applications needing to circumvent the absorption bounds, these results will accelerate a shift from solid targets, towards structured and multilayer targets, and lead the development of new materials.

  12. Towards Secure Distance Bounding

    OpenAIRE

    Boureanu, Ioana; Mitrokotsa, Aikaterini; Vaudenay, Serge

    2013-01-01

    Relay attacks (and, more generally, man-in-the-middle attacks) are a serious threat against many access control and payment schemes. In this work, we present distance-bounding protocols, how these can deter relay attacks, and the security models formalizing these protocols. We show several pitfalls making existing protocols insecure (or at least, vulnerable, in some cases). Then, we introduce the SKI protocol which enjoys resistance to all popular attack-models and features provable security....

  13. Bounded Active Perception

    OpenAIRE

    KETENCI, Uktu Gorkem; Bremond, Roland; Auberlet, Jean Michel; GRISLIN, Emmanuelle

    2010-01-01

    There are two kinds of perception : active and passive. This paper is an attempt to take advantage of active perception to improve the agent's perception of relevant information. Through the data filtering capacity, active perception is a useful tool for modeling human-like bounded perception. Using such filters, either the agent or the environment take an active role. We determine several unsolved issues in active perception and do several proposals to implement our concept on the active per...

  14. Bounded Discrete Walks

    OpenAIRE

    Banderier, Cyril; Nicodeme, Pierre

    2010-01-01

    This article tackles the enumeration and asymptotics of directed lattice paths (that are isomorphic to unidimensional paths) of bounded height (walks below one wall, or between two walls, for \\emphany finite set of jumps). Thus, for any lattice paths, we give the generating functions of bridges (``discrete'' Brownian bridges) and reflected bridges (``discrete'' reflected Brownian bridges) of a given height. It is a new success of the ``kernel method'' that the generating functions of such wal...

  15. Reflecting Magnon Bound States

    CERN Document Server

    Ahn, C; Rey, S J

    2008-01-01

    In N=4 super Yang-Mills spin chain, we compute reflection amplitudes of magnon bound-state off giant graviton. We first compute the reflection amplitude off Y=0 brane boundary and compare it with the scattering amplitude between two magnon bound-states in the bulk. We find that analytic structure of the two amplitudes are intimately related each other: the boundary reflection amplitude is a square-root of the bulk scattering amplitude. Using such relation as a guide and taking known results at weak and strong coupling limits as inputs, we find the reflection amplitude of an elementary magnon off Z=0 giant graviton boundary. The reflection phase factor is shown to solve crossing and unitarity relations. We then compute the reflection amplitude of magnon bound-state off the Z=0 brane boundary and observe that its analytic structures are again intimately related to the bulk scattering and the Y=0 boundary reflection amplitudes. We also take dyonic giant magnon limit of these reflection amplitudes and confirm tha...

  16. Geometric Rationalization for Freeform Architecture

    KAUST Repository

    jiang, caigui

    2016-06-20

    The emergence of freeform architecture provides interesting geometric challenges with regards to the design and manufacturing of large-scale structures. To design these architectural structures, we have to consider two types of constraints. First, aesthetic constraints are important because the buildings have to be visually impressive. Sec- ond, functional constraints are important for the performance of a building and its e cient construction. This thesis contributes to the area of architectural geometry. Specifically, we are interested in the geometric rationalization of freeform architec- ture with the goal of combining aesthetic and functional constraints and construction requirements. Aesthetic requirements typically come from designers and architects. To obtain visually pleasing structures, they favor smoothness of the building shape, but also smoothness of the visible patterns on the surface. Functional requirements typically come from the engineers involved in the construction process. For exam- ple, covering freeform structures using planar panels is much cheaper than using non-planar ones. Further, constructed buildings have to be stable and should not collapse. In this thesis, we explore the geometric rationalization of freeform archi- tecture using four specific example problems inspired by real life applications. We achieve our results by developing optimization algorithms and a theoretical study of the underlying geometrical structure of the problems. The four example problems are the following: (1) The design of shading and lighting systems which are torsion-free structures with planar beams based on quad meshes. They satisfy the functionality requirements of preventing light from going inside a building as shad- ing systems or reflecting light into a building as lighting systems. (2) The Design of freeform honeycomb structures that are constructed based on hex-dominant meshes with a planar beam mounted along each edge. The beams intersect without

  17. Questioning Rationality: The case for risk consumption

    OpenAIRE

    Maria Isabel Clímaco; Luís Moura Ramos

    2004-01-01

    The standard assumption of rational, forward looking behavior has been heavily questioned given the impossibility of understanding some risk consumption behaviors within such a framework. The Becker and Murphy theory of rational addiction made a start on this debate fostering new refinements within the original rational theory framework as well as promising approaches based on the latest developments of cognitive science. This paper makes an overview confronting two main approaches highlighti...

  18. Rational Addiction Evidence From Carbonated Soft Drinks

    OpenAIRE

    Xiaoou, Liu

    2009-01-01

    This paper applies the Becker-Murphy (1988) theory of rational addiction to the case of carbonated soft drinks, using a time-varying parameter model and scanner data from 46 U.S. cities. Empirical results provide strong evidence that carbonated soft drinks are rationally addictive, thus opening the door to taxation and regulation. Taking rational addition into account, estimated demand elasticities are much lower than previous estimates using scanner data.

  19. Does the Minimum Wage Cause Inefficient Rationing?

    OpenAIRE

    Luttmer, Erzo F. P.

    2007-01-01

    This paper investigates whether the minimum wage leads to inefficient job rationing. By not allowing wages to clear the labor market, the minimum wage could cause workers with low reservation wages to be rationed out while equally skilled workers with higher reservation wages are employed. This paper exploits the overlapping nature of the CPS panels to more precisely identify those most affected by the minimum wage, a group I refer to as the "unskilled." I test for inefficient rationing by ex...

  20. RATIONALITY AS AN EXPLANATION FOR ECONOMIC FLUCTUATIONS

    OpenAIRE

    Radu CONSTANTINESCU

    2012-01-01

    The aim of this paper is to demonstrate that rationality is one of the main factors determining economic fluctuations. From this, derives the issue that rationality is not only a concept tangent to the science of economics but also a homogenizing factor and a sine qua non condition of praxeology. However, rationality as a connecting factor of the decision and action processes is not always directly proportional with decisive motivation or with the determining goal.

  1. RATIONAL PHARMACOTHERAPY IN TAKOTSUBO CARDIOMYOPATHY

    Directory of Open Access Journals (Sweden)

    S. Marchev

    2015-12-01

    Full Text Available Rational pharmacotherapy in Takotsubo cardiomyopathy is based on clinical picture and data of functional and laboratory investigations of concrete patient. In patients with hypotension and moderate-to-severe left ventricle outflow tract obstruction inotropic agents must not to be used because they can worsen the degree of obstruction. In these patients beta blockers can improve hemodynamics by causing resolution of the obstruction. If intraventricular thrombus is detected, anticoagulation for at least 3 months is recommended. The duration of anticoagulant therapy may be modified depending on the extent of cardiac function recovery and thrombus resolution. For patients without thrombus but with severe left ventricular dysfunction, anticoagulation is recommended until the akinesis or dyskinesis has resolved but not more than 3 months.

  2. The bridge from cold facts and hot rhetoric to rational climate policy

    International Nuclear Information System (INIS)

    The scientific community must expand its role in the political debate over climate change if we are to have wise and smart policies. The current debate is characterized by a cacaphony of competing scientific claims, scare tactics and propaganda. Scientists, particularly those in academia, are badly needed to uphold the principles of scientific inquiry and standards of evidence, upon which rational public policy depends. They should weigh into the conflict heavily, when the bounds of -rational analysis are exceeded. The acid test of analytical rigor must remain a first principle

  3. Universal Bounds on Charged States in 2d CFT and 3d Gravity

    CERN Document Server

    Benjamin, Nathan; Fitzpatrick, A Liam; Kachru, Shamit

    2016-01-01

    We derive an explicit bound on the dimension of the lightest charged state in two dimensional conformal field theories with a global abelian symmetry. We find that the bound scales with $c$ and provide examples that parametrically saturate this bound. We also prove than any such theory must contain a state with charge-to-mass ratio above a minimal lower bound. We comment on the implications for charged states in three dimensional theories of gravity.

  4. Delay Bounds in a Network with Aggregate Scheduling

    OpenAIRE

    Charny, Anna; Le Boudec, Jean-Yves

    2000-01-01

    A large number of products implementing aggregate buffering and scheduling mechanisms have been developed and deployed, and still more are under development. With the rapid increase in the demand for reliable end-to-end QoS solutions, it becomes increasingly important to understand the implications of aggregate scheduling on the resulting QoS capabilities. This document studies the bounds on the worst case delay in a network implementing aggregate scheduling. A lower bound on the worst case d...

  5. A bound on chaos

    CERN Document Server

    Maldacena, Juan; Stanford, Douglas

    2015-01-01

    We conjecture a sharp bound on the rate of growth of chaos in thermal quantum systems with a large number of degrees of freedom. Chaos can be diagnosed using an out-of-time-order correlation function closely related to the commutator of operators separated in time. We conjecture that the influence of chaos on this correlator can develop no faster than exponentially, with Lyapunov exponent $\\lambda_L \\le 2 \\pi k_B T/\\hbar$. We give a precise mathematical argument, based on plausible physical assumptions, establishing this conjecture.

  6. Regularity of Bound States

    DEFF Research Database (Denmark)

    Faupin, Jeremy; Møller, Jacob Schach; Skibsted, Erik

    2011-01-01

    We study regularity of bound states pertaining to embedded eigenvalues of a self-adjoint operator H, with respect to an auxiliary operator A that is conjugate to H in the sense of Mourre. We work within the framework of singular Mourre theory which enables us to deal with confined massless Pauli......–Fierz models, our primary example, and many-body AC-Stark Hamiltonians. In the simpler context of regular Mourre theory, our results boil down to an improvement of results obtained recently in [8, 9]....

  7. Tight Bernoulli tail probability bounds

    OpenAIRE

    Dzindzalieta, Dainius

    2014-01-01

    The purpose of the dissertation is to prove universal tight bounds for deviation from the mean probability inequalities for functions of random variables. Universal bounds shows that they are uniform with respect to some class of distributions and quantity of variables and other parameters. The bounds are called tight, if we can construct a sequence of random variables, such that the upper bounds are achieved. Such inequalities are useful for example in insurance mathematics, for constructing...

  8. Novel Bounds on Marginal Probabilities

    OpenAIRE

    Mooij, Joris M.; Kappen, Hilbert J

    2008-01-01

    We derive two related novel bounds on single-variable marginal probability distributions in factor graphs with discrete variables. The first method propagates bounds over a subtree of the factor graph rooted in the variable, and the second method propagates bounds over the self-avoiding walk tree starting at the variable. By construction, both methods not only bound the exact marginal probability distribution of a variable, but also its approximate Belief Propagation marginal (``belief''). Th...

  9. Separable subgroups have bounded packing

    CERN Document Server

    Yang, Wen-yuan

    2010-01-01

    In this note, we prove that separable subgroups have bounded packing in ambient groups. The notion bounded packing was introduced by Hruska-Wise \\cite{HrWi} and in particular, our result confirms a conjecture in \\cite{HrWi} which states each subgroup of a virtually polycyclic group has the bounded packing property.

  10. On bound entanglement assisted distillation

    OpenAIRE

    Vedral, V.

    1999-01-01

    We investigate asymptotic distillation of entanglement in the presence of an unlimited amount of bound entanglement for bi-partite systems. We show that the distillability is still bounded by the relative entropy of entanglement. This offers a strong support to the fact that bound entanglement does not improve distillation of entanglement.

  11. The lower bound on the energy for bounded systems is equivalent to the Bekenstein upper bound on the entropy to energy ratio for bounded systems

    CERN Document Server

    Schmitt, Franz-Josef

    2009-01-01

    Several approaches were used to proof the assumption that an universal upper bound on the entropy to energy ratio (S/E) exists in bounded systems. In 1981 Jacob D. Bekenstein published his findings that S/E is limited by the effective radius of the system and mentioned various approaches to derive S/E employing quantum statistics or thermodynamics. It can be shown that similar results are obtained considering the energetic difference of longitudinal eigenmodes inside a closed cavity like it was done by Max Planck in 1900 to derive the correct formula for the spectral distribution of the black-body radiation. Considering an information theoretical approach this derivation suggests that the variance of an expectation value is the same like the variance of the probability for measuring this expectation value. Implications of these findings are shortly discussed.

  12. Is facet analysis based on rationalism?

    DEFF Research Database (Denmark)

    Hjørland, Birger

    2014-01-01

    , rationalism, historicism/hermeneutics, or pragmatism/critical theory (of which only the last position fully acknowledges the non-neutrality of knowledge organisation). Ranganathan – and the whole facet-analytic school – has formerly been exemplified as a rather clear example of rationalism. Some have objected...

  13. Neurophysiology and Rationality in Political Thinking.

    Science.gov (United States)

    Peterson, Steven A.

    Research both in cognitive psychology and psychobiology suggests that political behavior is often less rational than individuals believe it to be. Information processing, memory, and decision making are interlinked processes. Studies in cognitive psychology reveal that even though decision making requires rationality, individuals often adopt…

  14. Empirical Rationality in the Stock Market

    DEFF Research Database (Denmark)

    Raahauge, Peter

    2003-01-01

    empiricalrationality on part of the agent, the resulting empirical model assignslikelihood to the data actually observed, unlike in the unmodified rational expectationscase. A Lucas (1978)-type asset pricing model which incorporatesempirical rationality is constructed and estimated using U.S. stock data...

  15. Rational Invariants of the Generalized Classical Groups

    Institute of Scientific and Technical Information of China (English)

    NAN JI-ZHU; ZHAO JING

    2011-01-01

    In this paper, we give transcendence bases of the rational invariants fields of the generalized classical groups and their subgroups B, N and T, and we also compute the orders of them. Furthermore, we give explicit generators for the rational invariants fields of the Borel subgroup and the Neron-Severi subgroup of the general linear group.

  16. Evaluating the Rationality of Managers' Sales Forecasts

    NARCIS (Netherlands)

    L.P. de Bruijn (Bert); Ph.H.B.F. Franses (Philip Hans)

    2011-01-01

    textabstractThis paper deals with the analysis and evaluation of sales forecasts of managers, given that it is unknown how they constructed their forecasts. Our goal is to find out whether these forecasts are rational. To examine deviations from rationality, we argue that one has to approximate how

  17. Economic implications of foreign exchange rationing in Ethiopia:

    OpenAIRE

    Dorosh, Paul A.; Robinson, Sherman; Ahmed, Hashim

    2009-01-01

    Ethiopia enjoyed remarkable economic growth from 2004/05 to 2008/09, in large part due to increases in foreign transfers and capital inflows combined with expanded domestic credit to fund major increases in private and public investments in infrastructure and housing. However, this rapid growth was accompanied by a major appreciation of the real exchange rate (by 34 percent between July 2004 and July 2008) that reduced incentives for domestic production of exportables and non-protected import...

  18. Mass bounds on a very light neutralino

    International Nuclear Information System (INIS)

    Within the Minimal Supersymmetric Standard Model (MSSM) we systematically investigate the bounds on the mass of the lightest neutralino. We allow for non-universal gaugino masses and thus even consider massless neutralinos, while assuming in general that R-parity is conserved. Our main focus are laboratory constraints. We consider collider data, precision observables, and also rare meson decays to very light neutralinos. We then discuss the astrophysical and cosmological implications. We find that a massless neutralino is allowed by all existing experimental data and astrophysical and cosmological observations. (orig.)

  19. The Geometric Continuity of Rational Bezier Triangular Surfaces

    Institute of Scientific and Technical Information of China (English)

    田捷

    1991-01-01

    The problems of geometric continuity for rational Bezier surfaces are discussed.Concise conditions of first order and second order geometric continuity for rational triangular bezier surfaces are given.Meanwhile,a geometric condition for smoothness between adjacent rational bezier surfaces and the transformation formulae between rational triangular patches and rational rectangular patches are obtained.

  20. Strongly Bounded Partial Sums

    Directory of Open Access Journals (Sweden)

    Charles Swartz

    2014-06-01

    Full Text Available If λ is a scalar sequence space, a series P Zj in a topological vector space Z is λ multiplier convergent in Z if the series P ∞J =1 tj Zj converges in Z for every t = {tj} ∈ λ-If λ satisfies appropriate conditions, a series in a locally convex space X which is λ multiplier convergent in the weak topology is λ multiplier convergent in the original topology ofthe space (the Orlicz-Pettis Theorem but may fail to be λ multiplier convergent in the strong topology of the space. However, we show under apprpriate conditions on the multiplier space λ that the series will have strongly bounded partial sums.

  1. Large-degree asymptotics of rational Painlevé-II functions: noncritical behaviour

    International Nuclear Information System (INIS)

    Rational solutions of the inhomogeneous Painlevé-II equation and of a related coupled Painlevé-II system have recently arisen in studies of fluid vortices and of the sine-Gordon equation. For the sine-Gordon application in particular it is of interest to understand the large-degree asymptotic behaviour of the rational Painlevé-II functions. We explicitly compute the leading-order large-degree asymptotics of these two families of rational functions valid in the whole complex plane with the exception of a neighbourhood of a certain piecewise-smooth closed curve. We obtain rigorous error bounds by using the Deift–Zhou nonlinear steepest-descent method for Riemann–Hilbert problems. (paper)

  2. Bounded rationality, information, legal protection, and non-trivial contractual problems: Their influence on interorganizational relations

    DEFF Research Database (Denmark)

    Koch, Carsten Allan

    This paper attempts to generalize findings of the traditional literature of transaction cost economics (Willamson, 1971, 1973, 1975, 1985; Ouchi, 1980; Williamson & Ouchi 1981) by introducing more general factors or variables. Two of the most important of these are that asset specificity is repla...... replaced by a more general condition, vulnerability, and that the so-called market failure condition is replaced by a condition called contractual non-triviality. Sufficient conditions for non-triviality are found in terms of specific set of values for the basic set of factors....

  3. Bounded Rational Managers Struggle with Talent Management - An Agent-based Modelling Approach

    DEFF Research Database (Denmark)

    Adamsen, Billy; Thomsen, Svend Erik

    This study applies an agent-based modeling approach to explore some aspects of an important managerial task: finding and cultivating talented individuals capable of creating value for their organization at some future state. Given that the term talent in talent management is an empty signifier...... of past success will provide failure rather than success in the future (Capelli.2008). Finally, we model the talent selection process either as a collective decision making process made by a group of managers or a decision process made by a single manager.It is argued that agent-based modeling is a useful...... method for studying this type of problems. The approach is particularly suitable to topics where understanding processes and their consequences is important. Agent-based models can include agents that are heterogeneous in their features and abilities, and can deal directly with the consequences...

  4. Concepts and bounded rationality: An application of Niestegge's approach to conditional quantum probabilities

    NARCIS (Netherlands)

    R. Blutner

    2008-01-01

    Recently, Gerd Niestegge developed a new approach to quantum mechanics via conditional probabilities developing the well-known proposal to consider the Lüders-von Neumann measurement as a non-classical extension of probability conditionalization. I will apply his powerful and rigorous approach to th

  5. On a Boundedly Rational Pareto-Optimal Trade in Emission Reduction

    OpenAIRE

    Kryazhimskiy, A.V.

    2009-01-01

    We consider the emission reduction process involving several countries, in which the countries negotiate, in steps, frequently enough, on small, local emission reductions and implement their decisions right away. In every step, the countries either find a mutually acceptable local emission reduction vector and use it as a local emission reduction plan, or terminate the emission reduction process. We prove that the process necessarily terminates in some step and the final total emission reduct...

  6. Bounded Rationality in Bargaining Games: Do Proposers Believe That Responders Reject an Equal Split?

    OpenAIRE

    Ben Greiner

    2004-01-01

    Puzzled by the experimental results of the 'impunity game' by Bolton and Zwick (1995) we replicate the game and alter it in a systematic manner. We find that although almost nobody actually rejects an offered equal split in a bargaining game, proposers behave as if there would be a considerably large rejection rate for equal splits. This result is inconsistent with existing models of economic decision making. This includes models of selfish players as well as models of social utility and reci...

  7. Foreign aid and fiscal behavior in a bounded rationality model: Different policy regimes

    OpenAIRE

    Gang, Ira N.; Haider Ali Khan

    1999-01-01

    We examine how the source of foreign aid affects the composition of the recipient government's spending. Does the source of aid - bilateral or multilateral - influence recipient policy-makers' choice between development and nondevelopment expenditure? We depart from previous literature by introducing strong asymmetries in policy-makers' preferences. With the financial constraints set by foreign aid and domestic revenues, this formalization allows us to model and estimate the fiscal behavior o...

  8. Bounded rationality in policy learning amongst cities: lessons from the transport sector

    OpenAIRE

    Greg Marsden; Karen Trapenberg Frick; Anthony D. May; Elizabeth Deakin

    2012-01-01

    The internationalization of policy regimes and the reorganization of the state have provided new opportunities for cities to bypass nation-state structures and work with other cities internationally. This provides greater opportunity for cities to learn from each other and could be an important stimulus to the transfer of policies across the globe. Few studies exist however which focus on the processes that shape the search for policy lessons and how they are affected by the institutional con...

  9. Rationally extended shape invariant potentials in arbitrary D-dimensions associated with exceptional $X_m$ polynomials

    CERN Document Server

    Yadav, Rajesh Kumar; Khare, Avinash; Mandal, Bhabani Prasad

    2014-01-01

    Rationally extended shape invariant potentials in arbitrary D-dimensions are obtained by using point canonical transformation (PCT) method. The bound-state solutions of these exactly solvable potentials can be written in terms of X_m Laguerre or X_m Jacobi exceptional orthogonal polynomials. These potentials are isospectral to their usual counterparts and possess translationally shape invariance property.

  10. COMPUTATION OF VECTOR VALUED BLENDING RATIONAL INTERPOLANTS

    Institute of Scientific and Technical Information of China (English)

    檀结庆

    2003-01-01

    As we know, Newton's interpolation polynomial is based on divided differ-ences which can be calculated recursively by the divided-difference scheme while Thiele'sinterpolating continued fractions are geared towards determining a rational functionwhich can also be calculated recursively by so-called inverse differences. In this paper,both Newton's interpolation polynomial and Thiele's interpolating continued fractionsare incorporated to yield a kind of bivariate vector valued blending rational interpolantsby means of the Samelson inverse. Blending differences are introduced to calculate theblending rational interpolants recursively, algorithm and matrix-valued case are dis-cussed and a numerical example is given to illustrate the efficiency of the algorithm.

  11. Risk, rationality, and community: Psychology, ethnography, and transactions in the risk management process

    Energy Technology Data Exchange (ETDEWEB)

    Cantor, R. (National Science Foundation, Washington, DC (United States)); Schoepfle, M. (Dept. of the Interior, Washington, DC (United States))

    1993-01-01

    Communities at risk are confronted by an increasingly complex array of opportunities and need for involvement in decisions affecting them. Policy analysis often demands from researchers insights into the complicated process of how best to account for community involvement in decision making. Often, this requires additional understanding of how decisions are made by community members. Researchers trying to capture the important features of decision making will necessarily make assumptions regarding the rationality underlying the decision process. Two implicit and often incompatible sets of research assumptions about decision processes have emerged: outcome rationality and process rationality. Using outcome rationality, the principal goal of risk research often is to predict how people will react to risk regardless of what they say they would do. Using process rationality, the research goal is to determine how people perceive the risks to which they are exposed and how perceptions actually influence responses. The former approach is associated with research in risk communication, conducted by economists and cognitive psychologists; the latter approach is associated with the field of risk negotiation and acceptance, conducted by anthropologists, some sociologists, and planners. This article describes (1) the difference between the assumptions behind outcome and process rationality regarding decision making and the problems resulting from these differences; (2) the promise and limitations of both sets of assumptions; (3) the potential contributions from cognitive psychology, cognitive ethnography, and the theory of transaction costs in reconciling the differences in assumptions and making them more complementary; and (4) the implications of such complementarity.

  12. Rationing of health care: is there an economic rationality to it?

    Science.gov (United States)

    Zweifel, Peter

    2015-11-01

    The point of departure of this Editorial is the fact that we all are engaged in self-rationing in our everyday lives. We would like to spend more money on all sorts of nice things and devote more time to our cherished activities. Imposed rationing is characteristic of wartime governments, who seek to prevent the rich from gobbling up the resources left by the army. Since the publication in 1987 of David Callahan's Setting Limits: Medical Goals in an Aging Society (Callahan, Setting limits: medical goals in an aging society, Simon & Schuster, New York, 1987), rationing of health care has become a widely debated issue (the Internet is full of pertinent entries). While rationing has also been addressed by health economists, there are three puzzling observations. First, Callahan (Callahan, Setting limits: medical goals in an aging society, Simon & Schuster, New York, 1987) wrote for an American audience whereas rationing was introduced by the British National Health Service (NHS) well before 1987, with little debate. Second, the economic theory of rationing had been laid out by James Tobin [Ectrica 20(4): 521-533, 1952] as early as 1952--but health economists seem to have neglected his groundwork when writing about rationing. Third, they accept government-imposed rationing as inevitable in the case of health care, as though the self-rationing alternative was unavailable. An attempt is made here to provide rational explanations for these puzzles. PMID:25847329

  13. Risk Rationing and Wealth Effects in Credit Markets

    OpenAIRE

    BOUCHER Steve; Carter, Michael R.; Guirkinger, Catherine

    2005-01-01

    By shrinking the available menu of loan contracts, asymmetric information can result in two types of nonprice rationing in credit markets. The first is conventional quantity rationing. The second is ‘risk rationing.’ Risk rationed agents are able to borrow, but only under relatively high collateral contracts that offer them lower expected well-being than a safe, reservation rental activity. Like quantity rationed agents, credit markets do not perform well for the risk rationed. While the inci...

  14. Risk Rationing and Wealth Effects in Credit Markets

    OpenAIRE

    BOUCHER, STEPHEN R; Carter, Michael R.; Guirkinger, Catherine

    2005-01-01

    By shrinking the available menu of loan contracts, asymmetric information can result in two types of nonprice rationing in credit markets. The first is conventional quantity rationing. The second is 'risk rationing.' Risk rationed agents are able to borrow, but only under relatively high collateral contracts that offer them lower expected well-being than a safe, reservation rental activity. Like quantity rationed agents, credit markets do not perform well for the risk rationed. While the...

  15. Bounding approaches to system identification

    CERN Document Server

    Norton, John; Piet-Lahanier, Hélène; Walter, Éric

    1996-01-01

    In response to the growing interest in bounding error approaches, the editors of this volume offer the first collection of papers to describe advances in techniques and applications of bounding of the parameters, or state variables, of uncertain dynamical systems. Contributors explore the application of the bounding approach as an alternative to the probabilistic analysis of such systems, relating its importance to robust control-system design.

  16. Rational Nim and Wythoff Nim

    CERN Document Server

    Larsson, Urban

    2012-01-01

    We study variations of the classical combinatorial two-player two-heap games of Nim and Wythoff Nim. Given two ordered pairs of non-negative integers $(p_1,q_1)$ and $(p_2,q_2)$, where $p_2>0$ and $q_1>0$, the players alternate in choosing a positive integer $t$, an $i\\in\\{1,2\\}$ and removing $tp_i$ and $tq_i$ tokens from the respective heaps. There is a restriction imposed on the allowed heap sizes, except that each heap must contain a non-negative number of tokens, the ratio $\\frac{y}{x}$ of their respective sizes, represented by an ordered pair $(x,y)$ of non-negative integers, is bounded by $0\\le \\frac{q_1}{p_1}\\le \\frac{y}{x}\\le\\frac{q_2}{p_2}\\le \\infty$. We demonstrate that the pattern of second player winning positions is periodic. %with periods $p_1+p_2$ and $q_1+q_2$ respectively. Then we study an \\emph{extension} of this game to a variation of Wythoff Nim and give a closed formula of its set of second player winning position via a surjective map to the set of second player winning positions of Wytho...

  17. Rationality and allocating scarce medical resources.

    Science.gov (United States)

    Forsberg, R P

    1995-02-01

    In an article titled, "Who Shall Live When Not All Can?", James Childress proposes a system for allocating scarce lifesaving medical resources based on random selection procedures. Childress writes of random selection procedures, [They] "cannot be dismissed as a 'non-rational' and 'non-human' ...without an inquiry into the reasons, including human values which might justify it." My thesis is that once we concentrate on determining the rationality of random selection procedures, we will see that Childress's claim that we cannot dismiss such procedures as 'non-rational' is open to question. My claim will be that while both random selection and social worth procedures are rationally defensible systems, random selection procedures easily lead to specific choices that are objectively irrational, apart from the limited perspective of the random selection process itself. PMID:7738457

  18. Legendre rational approximation on the whole line

    Institute of Scientific and Technical Information of China (English)

    GUO; Benyu; WANG; Zhongqing

    2004-01-01

    The Legendre rational approximation is investigated. Some approximation results are established, which form the mathematical foundation of a new spectral method on the whole line. A model problem is considered. Numerical results show the efficiency of this new approach.

  19. Rigid pricing and rationally inattentive consumer

    Czech Academy of Sciences Publication Activity Database

    Matějka, Filip

    158 B, July (2015), s. 656-678. ISSN 0022-0531 Institutional support: PRVOUK-P23 Keywords : rational inattention * imperfect information * nominal rigidity Subject RIV: AH - Economics Impact factor: 1.033, year: 2014

  20. Rigid pricing and rationally inattentive consumer

    Czech Academy of Sciences Publication Activity Database

    Matějka, Filip

    158 B, July (2015), s. 656-678. ISSN 0022-0531 Institutional support: RVO:67985998 Keywords : rational inattention * imperfect information * nominal rigidity Subject RIV: AH - Economics Impact factor: 1.033, year: 2014

  1. Validation Testing of the Rational Behavior Inventory.

    Science.gov (United States)

    Whiteman, Victor L.; Shorkey, Clayton T.

    1978-01-01

    The validity of the Rational Behavior Inventory was investigated by examining its relationship with four other measures of personality in addition to class standing and age. Results supported the validity of the measure. (JKS)

  2. Towards a classification of rational Hopf algebras

    International Nuclear Information System (INIS)

    Rational Hopf algebras, i.e. certain quasitriangular weak quasi-Hopf *-algebras, are expected to describe the quantum symmetry of rational field theories. In this paper methods are developed which allow for a classification of all rational Hopf algebras that are compatible with some prescribed set of fusion rules. The algebras are parametrized by the solutions of the square, pentagon and hexagon identities. As examples, we classify all solutions for fusion rules with not more than three sectors, as well as for the level three affine A1(1) fusion rules. We also establish several general properties of rational Hopf algebras and present a graphical description of the coassociator in terms of labelled tetrahedra. The latter construction allows to make contact with conformal field theory fusing matrices and with invariants of three-manifolds and topological lattice field theory. (orig.)

  3. UML Modelling: The Rational E-Development

    Directory of Open Access Journals (Sweden)

    Er. Meenu Gupta

    2013-06-01

    Full Text Available Unified Modeling language (UML is one of the important modeling languages used for the visual representation of the research problem. In this paper we used Rational Software architecture to design UML diagrams.

  4. Nonlinear Instabilities in Shock-Bounded Slabs

    CERN Document Server

    Vishniac, E T

    1993-01-01

    (substantial changes to section 3.2, otherwise minor) We present an analysis of the hydrodynamic stability of a cold slab bounded by two accretion shocks. Previous numerical work has shown that when the Mach number of the shock is large the slab is unstable. Here we show that to linear order both the bending and breathing modes of such a slab are stable. However, nonlinear effects will tend to soften the restoring forces for bending modes, and when the slab displacement is comparable to its thickness this gives rise to a nonlinear instability. The growth rate of the instability, above this threshold but for small bending angles, is $\\sim c_sk (k\\eta)^{1/2}$, where $\\eta$ is the slab displacement. When the bending angle is large the slab will contain a local vorticity comparable to $c_s/L$, where $L$ is the slab thickness. We discuss the implications of this work for gravitational instabilities of slabs. Finally, we examine the cases of a decelerating slab bounded by a single shock and a stationary slab bounde...

  5. Forecasters and rationality:a comment on Fritsche et al., Forecasting the Brazilian Real and Mexican Peso: Asymmetric loss, forecast rationality and forecaster herding.

    OpenAIRE

    Fildes, Robert

    2015-01-01

    In this commentary stimulated by Fritsche et al.’s (2014) paper on ‘‘Forecasting the Brazilian Real and Mexican Peso’’ and the implications for forecast rationality, I first survey the literature on forecaster behaviour, and conclude that organisational and psychological factors heavily influence the characteristics of the forecasters’ errors in any particular application. Econometric models cannot decompose the error into these potential sources, due to their reliance on non-experimental dat...

  6. An arborist's guide to the rationals

    OpenAIRE

    Stange, Katherine E.

    2014-01-01

    There are two well-known ways to enumerate the positive rational numbers in an infinite binary tree: the Farey/Stern-Brocot tree and the Calkin-Wilf tree. In this brief note, we describe these two trees as `transpose shadows' of a tree of matrices (a result due to Backhouse and Ferreira) via a new proof using yet another famous tree of rationals: the topograph of Conway and Fung.

  7. Autonomy, rationality and the wish to die.

    OpenAIRE

    Clarke, D M

    1999-01-01

    Although suicide has traditionally carried a negative sanction in Western societies, this is now being challenged, and while there remains substantial public concern surrounding youth and elder suicide, there is a paradoxical push to relax the prohibition under certain circumstances. Central to the arguments behind this are the principles of respect for autonomy and the importance of rationality. It is argued here that the concepts of rationality and autonomy, while valuable, are not strong e...

  8. Promoting rational prescribing: an international perspective.

    OpenAIRE

    Hogerzeil, H. V.

    1995-01-01

    Irrational prescribing is a global problem. Rational prescribing cannot be defined without a method of measurement and a reference standard. The former is now available but the latter needs further development. Proven effective interventions to promote rational prescribing in developed countries are treatment protocols based on wide consultation and consensus, properly introduced and with a possibility of feedback; face-to-face education focussed on a particular prescribing problem in selecte...

  9. QArith: Coq Formalisation of Lazy Rational Arithmetic

    OpenAIRE

    Niqui, Milad; Bertot, Yves

    2003-01-01

    In this paper we present the formalisation of the library which is an implementation of rational numbers as binary sequences for both lazy and strict computation. We use the representation also known as the Stern-Brocot representation for rational numbers. This formalisation uses advanced machinery of the theorem prover and applies recent developments in formalising general recursive functions. This formalisation highlights the rôle of type theory both as a tool to verify hand-written program...

  10. Spectral methods for orthogonal rational functions

    OpenAIRE

    Velazquez, Luis

    2007-01-01

    An operator theoretic approach to orthogonal rational functions on the unit circle with poles in its exterior is presented in this paper. This approach is based on the identification of a suitable matrix representation of the multiplication operator associated with the corresponding orthogonality measure. Two different alternatives are discussed, depending whether we use for the matrix representation the standard basis of orthogonal rational functions, or a new one with poles alternatively lo...

  11. Rationally Addicted to Drinking and Smoking?

    OpenAIRE

    Bask, Mikael; Melkersson, Maria

    2001-01-01

    When modeling demand for addictive consumption goods, the most widely used framework is the rational addiction model proposed by Becker and Murphy (1988). In the present paper, we extend the rational addiction model to include two addictive consumption goods, alcohol and cigarettes. We estimate the aggregate demand for alcohol and cigarettes in Sweden, using aggregate annual time series on sales volumes for the period 1955-1999. OLS estimates are compared to GMM estimates allowing for possibl...

  12. 2-rational Cubic Spline Involving Tension Parameters

    Indian Academy of Sciences (India)

    M Shrivastava; J Joseph

    2000-08-01

    In the present paper, 1-piecewise rational cubic spline function involving tension parameters is considered which produces a monotonic interpolant to a given monotonic data set. It is observed that under certain conditions the interpolant preserves the convexity property of the data set. The existence and uniqueness of a 2-rational cubic spline interpolant are established. The error analysis of the spline interpolant is also given.

  13. Understanding Markov-switching rational expectations models

    OpenAIRE

    Roger E.A. Farmer; Daniel F. Waggoner; Zha, Tao

    2009-01-01

    We develop a set of necessary and sufficient conditions for equilibria to be determinate in a class of forward-looking Markov-switching rational expectations models, and we develop an algorithm to check these conditions in practice. We use three examples, based on the new Keynesian model of monetary policy, to illustrate our technique. Our work connects applied econometric models of Markov switching with forward-looking rational expectations models and allows an applied researcher to construc...

  14. Rationalism vs. Sentimentalism : Reviewing Price's Review

    OpenAIRE

    Olson, Jonas

    2014-01-01

    This paper revisits Richard Price’s Review of the Principal Questions in Morals (1757/1787). Price was a defender of rationalism about ethics and he anticipated many views and arguments that became influential as the metaethical and ethical debates evolved over the later centuries. The paper explores and assesses Price’s arguments in favour of rationalism and against sentimentalism, with a view to how they bear on the modern metaethical debate.

  15. Rationality: a social-epistemology perspective

    OpenAIRE

    Sylvia eWenmackers; Danny Eric Paul Vanpoucke; Igor eDouven

    2014-01-01

    Both in philosophy and in psychology, human rationality has traditionally been studied from an 'individualistic' perspective. Recently, social epistemologists have drawn attention to the fact that epistemic interactions among agents also give rise to important questions concerning rationality. In previous work, we have used a formal model to assess the risk that a particular type of social-epistemic interactions lead agents with initially consistent belief states into inconsistent belief st...

  16. Evaluating the Rationality of Managers' Sales Forecasts

    OpenAIRE

    de Bruijn, Bert; Franses, Philip Hans

    2011-01-01

    textabstractThis paper deals with the analysis and evaluation of sales forecasts of managers, given that it is unknown how they constructed their forecasts. Our goal is to find out whether these forecasts are rational. To examine deviations from rationality, we argue that one has to approximate how the managers could have generated the forecasts. We describe several ways to construct these approximate expressions. The analysis of a large set of a single manager's forecasts for sales of pharma...

  17. Veech surfaces associated with rational billiards

    OpenAIRE

    Lelièvre, Samuel

    2002-01-01

    A nice trick for studying the billiard flow in a rational polygon is to unfold the polygon along the trajectories. This gives rise to a translation or half-translation surface tiled by the original polygon, or equivalently an Abelian or quadratic differential. Veech surfaces are a special class of translation surfaces with a large group of affine automorphisms, and interesting dynamical properties. The first examples of Veech surfaces came from rational billiards. We first present the mathema...

  18. A discussion of theoretical and practical rationality

    International Nuclear Information System (INIS)

    Theoretical rationality as defined in Expected Utility Theory and amended with other considerations gives a good basis for decision making. One should however always keep in mind that practical rationality often is far more complicated. People use their everyday experience when placed before new problems and this may lead to apparently irrational choices which on a closer scrutiny may be completely rational. Theories in human decision making unfortunately becomes untestable, firstly because a theory taking all considerations into account would be to complex to be practical and secondly because the data needed to test the theory cannot be collected. The benefit of EUT is that it is simple and straightforward as compared with competing theories. In the natural sciences rationality is often seen simply as a problem of optimisation. This view is practical, but it has to include also psychological and sociological considerations. The apparent controversy between natural and behavioural sciences could at least in principle be resolved by a better understanding of the complexity of human rationality. The human mind does not work in isolation, but it is adapted to a social community and a continuously changing environment. Understanding all components of human rationality is a challenge which cannot be solved on a short term basis. An important part of human rationality is connected to the intricate balance between individual and societal utility. The human mind has over thousands of years learnt to resolve that balance, but in the modern society there are decisions which may not be solvable with an intuitive approach and a strategy of trial and error. For these decisions more solid theories of rationality will be needed. EUT can in spite of its dismerits be used as the backbone for such a theory, but it has to be extended with better explanations of both individual and social rationality. If this understanding of the practical aspects of human rationality can be reached

  19. A discussion of theoretical and practical rationality

    Energy Technology Data Exchange (ETDEWEB)

    Wahlstroem, B. [Technical Research Centre of Finland, Espoo (Finland). VTT Automation

    1999-12-01

    Theoretical rationality as defined in Expected Utility Theory and amended with other considerations gives a good basis for decision making. One should however always keep in mind that practical rationality often is far more complicated. People use their everyday experience when placed before new problems and this may lead to apparently irrational choices which on a closer scrutiny may be completely rational. Theories in human decision making unfortunately becomes untestable, firstly because a theory taking all considerations into account would be to complex to be practical and secondly because the data needed to test the theory cannot be collected. The benefit of EUT is that it is simple and straightforward as compared with competing theories. In the natural sciences rationality is often seen simply as a problem of optimisation. This view is practical, but it has to include also psychological and sociological considerations. The apparent controversy between natural and behavioural sciences could at least in principle be resolved by a better understanding of the complexity of human rationality. The human mind does not work in isolation, but it is adapted to a social community and a continuously changing environment. Understanding all components of human rationality is a challenge which cannot be solved on a short term basis. An important part of human rationality is connected to the intricate balance between individual and societal utility. The human mind has over thousands of years learnt to resolve that balance, but in the modern society there are decisions which may not be solvable with an intuitive approach and a strategy of trial and error. For these decisions more solid theories of rationality will be needed. EUT can in spite of its dismerits be used as the backbone for such a theory, but it has to be extended with better explanations of both individual and social rationality. If this understanding of the practical aspects of human rationality can be reached

  20. Bounds for Asian basket options

    Science.gov (United States)

    Deelstra, Griselda; Diallo, Ibrahima; Vanmaele, Michèle

    2008-09-01

    In this paper we propose pricing bounds for European-style discrete arithmetic Asian basket options in a Black and Scholes framework. We start from methods used for basket options and Asian options. First, we use the general approach for deriving upper and lower bounds for stop-loss premia of sums of non-independent random variables as in Kaas et al. [Upper and lower bounds for sums of random variables, Insurance Math. Econom. 27 (2000) 151-168] or Dhaene et al. [The concept of comonotonicity in actuarial science and finance: theory, Insurance Math. Econom. 31(1) (2002) 3-33]. We generalize the methods in Deelstra et al. [Pricing of arithmetic basket options by conditioning, Insurance Math. Econom. 34 (2004) 55-57] and Vanmaele et al. [Bounds for the price of discrete sampled arithmetic Asian options, J. Comput. Appl. Math. 185(1) (2006) 51-90]. Afterwards we show how to derive an analytical closed-form expression for a lower bound in the non-comonotonic case. Finally, we derive upper bounds for Asian basket options by applying techniques as in Thompson [Fast narrow bounds on the value of Asian options, Working Paper, University of Cambridge, 1999] and Lord [Partially exact and bounded approximations for arithmetic Asian options, J. Comput. Finance 10 (2) (2006) 1-52]. Numerical results are included and on the basis of our numerical tests, we explain which method we recommend depending on moneyness and time-to-maturity.

  1. A Lower Bound on Concurrence

    Institute of Scientific and Technical Information of China (English)

    LIU Li-Guo; TIAN Cheng-Lin; CHEN Ping-Xing; YUAN Nai-Chang

    2009-01-01

    We derive an analytical lower bound on the concurrence for bipartite quantum systems with an improved computable cross norm or realignment criterion and an improved positive partial transpose criterion respectively.Furthermore we demonstrate that our bound is better than that obtained from the local uncertainty relations criterion with optimal local orthogonal observables which is known as one of the best estimations of concurrence.

  2. Backtesting Value-at-Risk using Forecasts for Multiple Horizons, a Comment on the Forecast Rationality Tests of A.J. Patton and A. Timmermann

    OpenAIRE

    Hoogerheide, L.F.; Ravazzolo, F.; van Dijk

    2011-01-01

    textabstractPatton and Timmermann (2011, 'Forecast Rationality Tests Based on Multi-Horizon Bounds', Journal of Business & Economic Statistics, forthcoming) propose a set of useful tests for forecast rationality or optimality under squared error loss, including an easily implemented test based on a regression that only involves (long-horizon and short-horizon) forecasts and no observations on the target variable. We propose an extension, a simulation-based procedure that takes into account th...

  3. Emotions and Decisions: Beyond Conceptual Vagueness and the Rationality Muddle.

    Science.gov (United States)

    Volz, Kirsten G; Hertwig, Ralph

    2016-01-01

    For centuries, decision scholars paid little attention to emotions: Decisions were modeled in normative and descriptive frameworks with little regard for affective processes. Recently, however, an "emotions revolution" has taken place, particularly in the neuroscientific study of decision making, putting emotional processes on an equal footing with cognitive ones. Yet disappointingly little theoretical progress has been made. The concepts and processes discussed often remain vague, and conclusions about the implications of emotions for rationality are contradictory and muddled. We discuss three complementary ways to move the neuroscientific study of emotion and decision making from agenda setting to theory building. The first is to use reverse inference as a hypothesis-discovery rather than a hypothesis-testing tool, unless its utility can be systematically quantified (e.g., through meta-analysis). The second is to capitalize on the conceptual inventory advanced by the behavioral science of emotions, testing those concepts and unveiling the underlying processes. The third is to model the interplay between emotions and decisions, harnessing existing cognitive frameworks of decision making and mapping emotions onto the postulated computational processes. To conclude, emotions (like cognitive strategies) are not rational or irrational per se: How (un)reasonable their influence is depends on their fit with the environment. PMID:26817728

  4. Some Bounds for the Logarithmic Function

    DEFF Research Database (Denmark)

    Topsøe, Flemming

    2007-01-01

    Development in continued fraction, rational approximations and orthogonal polynomials in relation to the logarithmic function are discussed.......Development in continued fraction, rational approximations and orthogonal polynomials in relation to the logarithmic function are discussed....

  5. Combining Alphas via Bounded Regression

    Directory of Open Access Journals (Sweden)

    Zura Kakushadze

    2015-11-01

    Full Text Available We give an explicit algorithm and source code for combining alpha streams via bounded regression. In practical applications, typically, there is insufficient history to compute a sample covariance matrix (SCM for a large number of alphas. To compute alpha allocation weights, one then resorts to (weighted regression over SCM principal components. Regression often produces alpha weights with insufficient diversification and/or skewed distribution against, e.g., turnover. This can be rectified by imposing bounds on alpha weights within the regression procedure. Bounded regression can also be applied to stock and other asset portfolio construction. We discuss illustrative examples.

  6. Bounded Model Checking of CTL

    Institute of Scientific and Technical Information of China (English)

    Zhi-Hong Tao; Cong-Hua Zhou; Zhong Chen; Li-Fu Wang

    2007-01-01

    Bounded Model Checking has been recently introduced as an efficient verification method for reactive systems.This technique reduces model checking of linear temporal logic to propositional satisfiability.In this paper we first present how quantified Boolean decision procedures can replace BDDs.We introduce a bounded model checking procedure for temporal logic CTL* which reduces model checking to the satisfiability of quantified Boolean formulas.Our new technique avoids the space blow up of BDDs, and extends the concept of bounded model checking.

  7. Characterization of standard embeddings between complex Grassmannians by means of varieties of minimal rational tangents

    Institute of Scientific and Technical Information of China (English)

    MOK Ngaiming

    2008-01-01

    In 1993,Tsai proved that a proper holomorphic mapping f : Ω→Ω' from an irreducible bounded symmetric domain Ω of rank ≥ 2 into a bounded symmetric domain Ω' is necessarily totally geodesic provided that r' : = rank(Ω') ≤ rank(Ω) := r,proving a conjecture of the author's motivated by Hermitian metric rigidity.As a first step in the proof,Tsai showed that df preserves almost everywhere the set of tangent vectors of rank 1.Identifying bounded symmetric domains as open subsets of their compact duals by means of the Borel embedding,this means that the germ of f at a general point preserves the varieties of minimal rational tangents (VMRTs).In another completely different direction Hwang-Mok established with very few exceptions the Cartan-Fubini extension priniciple for germs of local biholomorphisms between Fano manifolds of Picard num-ber 1,showing that the germ of map extends to a global biholomorphism provided that it preserves VMRTs.We propose to isolate the problem of characterization of special holomorphic embeddings between Fano manifolds of Picard number 1,especially in the case of classical manifolds such as ratio-nal homogeneous spaces of Picard number 1,by a non-equidimensional analogue of the Cartan-Fubini extension principle.As an illustration we show along this line that standard embeddings between com-plex Grassmahn manifolds of rank ≤ 2 can be characterized by the VMRT-preserving property and a non-degeneracy condition,giving a new proof of a result of Neretin's which on the one hand paves the way for far-reaching generalizations to the context of rational homogeneous spaces and more generally Fano manifolds of Picard number 1,on the other hand should be applicable to the study of proper holomorphic mappings between bounded domains carrying some form of geometric structures.

  8. Beyond dogmatism: Rationality in theology and science

    Directory of Open Access Journals (Sweden)

    Wentzel van Huyssteen

    1988-01-01

    Full Text Available The justification of cognitive claims in theology can be dealt with adequately only if the epistemological issues of metaphorical reference, experiential adequacy and explanatory progress are seen as crucial problems for the more encompassing problem of rationality in theology. To claim some form of reality depiction the theologian will have to argue for a plausible theory of reference on the basis of interpreted religious experience. In this discussion important analogies between the rationality of theological theorizing and the rationality of science are revealed. Thus explanatory progress in theology shows itself to be a form of inference to the best explanation, and the rationahty of both theology and science is therefore determined by certain epistemic values.

  9. Regulatory Impact Assessment (RIA and Rationality of Law – Legal Aspects

    Directory of Open Access Journals (Sweden)

    Jan Chmielewski

    2015-06-01

    Full Text Available Purpose: The fundamental aim of this article is to verify an assumption according to which the proper Regulatory Impact Assessment (RIA is a key factor in the rationality of law. Rational law is a law which is effective and able to realize and achieve social, economic and environmental aims determined and established by the lawmaker. Methodology: The scope of this paper – which determines its structure – encompasses the definition of RIA, including its specific (but non-legal forms such as benchmarking and evaluation. As far as we are concerned, these methods can provide – as a kind of Regulatory Impact Assessment a significant tool for measuring the rationality of regulations. Furthermore, the usefulness of benchmarking and evaluation has been recognised by representatives of jurisprudence. We will also explain the concept and the assumptions of the rationality of law on the grounds and in the light of the case law of the Polish Constitutional Tribunal and the Supreme Administrative Court. This should allow to countercheck the main thesis of this paper. The methodology encompasses primary legal methods such as literature, case law and legislation analysis. Findings: An indispensable condition of the rationality of law is actual elimination of irrational regulations which were not subjected to the Regulatory Impact Assessment. Practical implications: Although RIA is a problematic issue (in terms of its practical application,it is necessary to carry it out in order to assure the rationality of law. A good and desirable complement to Regulatory Impact Assessment are non-legal methods such as benchmarking and evaluation. Originality: Originality and value of this survey lies in taking into account the case law of the Polish Constitutional Tribunal and the Supreme Administrative Court. Additionally, this paper is original in that it considers non-legal methods in the examination of the rationality of law.

  10. Unpacking insanity defence standards: An experimental study of rationality and control tests in criminal law

    Directory of Open Access Journals (Sweden)

    Rebecca K. Helm

    2016-07-01

    Full Text Available The present study investigated the impact of different legal standards on mock juror decisions concerning whether a defendant was guilty or not guilty by reason of insanity. Undergraduate students (N = 477 read a simulated case summary involving a murder case and were asked to make an insanity determination. The cases differed in terms of the condition of the defendant (rationality deficit or control deficit and the legal standard given to the jurors to make the determination (Model Penal Code, McNaughten or McNaughten plus a separate control determination. The effects of these variables on the insanity determination were investigated. Jurors also completed questionnaires measuring individualism and hierarchy attitudes and perceptions of facts in the case. Results indicate that under current insanity standards jurors do not distinguish between defendants with rationality deficits and defendants with control deficits regardless of whether the legal standard requires them to do so. Even defendants who lacked control were found guilty at equal rates under a legal standard excusing rationality deficits only and a legal standard excluding control and rationality deficits. This was improved by adding a control test as a partial defence, to be determined after a rationality determination. Implications for the insanity defence in the Criminal Justice System are discussed.

  11. Cyclic sieving and rational Catalan theory

    OpenAIRE

    Bodnar, Michelle; Rhoades, Brendon

    2015-01-01

    Let $a < b$ be coprime positive integers. Armstrong, Rhoades, and Williams defined a set $\\mathsf{NC}(a,b)$ of `rational noncrossing partitions', which form a subset of the ordinary noncrossing partitions of $\\{1, 2, \\dots, b-1\\}$. Confirming a conjecture of Armstrong et. al., we prove that $\\mathsf{NC}(a,b)$ is closed under rotation and prove an instance of the cyclic sieving phenomenon for this rotational action. We also define a rational generalization of the $\\mathfrak{S}_a$-noncrossing p...

  12. Unitarity of rational N=2 superconformal theories

    CERN Document Server

    Eholzer, W

    1997-01-01

    We show that all rational models of the N=2 super Virasoro algebra are unitary. Our derivation relies on the coset realisation of the algebra in terms of su(2) and two free fermions. Most of our arguments generalise to the Kazama-Suzuki models indicating that all rational N=2 supersymmetric models might be unitary. As an independent non-trivial check we calculate Zhu's algebra A(H_0), for which we give a physically motivated derivation, in some examples. We also analyse the modular properties of the vacuum characters.

  13. Does the Minimum Wage Cause Inefficient Rationing?

    Institute of Scientific and Technical Information of China (English)

    何满辉; 梁明秋

    2008-01-01

    By not allowing wages to dearthe labor market,the minimum wage could cause workers with low reservation wages to be rationed out while equally skilled woTkers with higher reservation wages are employed.I find that proxies for reservation wages of unskilled workers in high-impact stales did not rise relative to reservation wages in other states,suggesting that the increase in the minimum wage did not cause jobs to be allocated less efficiently.However,even if rationing is efficient,the minimum wage can still entail other efficiency costs.

  14. Rationality and Emotions in Decision Making

    Directory of Open Access Journals (Sweden)

    Olga Markič

    2009-12-01

    Full Text Available Decision making is traditionally viewed as a rational process where reason calculates the best way to achieve the goal. Investigations from different areas of cognitive science have shown that human decisions and actions are much more influenced by intuition and emotional responses then it was previously thought. In this paper I examine the role of emotion in decision making, particularly Damasio’s hypothesis of somatic markers and Green’s dual process theory of moral judgment. I conclude the paper with the discussion of the threat that deliberation and conscious rationality is an illusion.

  15. Rational design of protein kinase inhibitors

    Directory of Open Access Journals (Sweden)

    Yarmoluk S. M.

    2013-07-01

    Full Text Available Modern methodological approaches to rational design of low molecular weight compounds with specific activity in relation to predetermined biomolecular targets are considered by example of development of high effective protein kinase inhibitors. The application of new computational methods that allow to significantly improve the quality of computational experiments (in, particular, accuracy of low molecular weight compounds activity prediction without increase of computational and time costs are highlighted. The effectiveness of strategy of rational design is demonstrated by examples of several own investigations devoted to development of new inhibitors that are high effective and selective towards protein kinases CK2, FGFR1 and ASK1.

  16. Rationality: A Social-Epistemology Perspective

    Directory of Open Access Journals (Sweden)

    Sylvia eWenmackers

    2014-06-01

    Full Text Available Both in philosophy and in psychology, human rationality has traditionally been studied from an 'individualistic' perspective. Recently, social epistemologists have drawn attention to the fact that epistemic interactions among agents also give rise to important questions concerning rationality. In previous work, we have used a formal model to assess the risk that a particular type of social-epistemic interactions lead agents with initially consistent belief states into inconsistent belief states. Here, we continue this work by investigating the dynamics to which these interactions may give rise in the population as a whole.

  17. Bound states in string nets

    CERN Document Server

    Schulz, M D; Vidal, J

    2016-01-01

    We discuss the emergence of bound states in the low-energy spectrum of the string-net Hamiltonian in the presence of a string tension. In the ladder geometry, we show that a single bound state arises either for a finite tension or in the zero-tension limit depending on the theory considered. In the latter case, we perturbatively compute the binding energy as a function of the total quantum dimension. We also address this issue in the honeycomb lattice where the number of bound states in the topological phase depends on the total quantum dimension. Finally, the internal structure of these bound states is analyzed in the zero-tension limit.

  18. Curvature bounds for configuration spaces

    OpenAIRE

    Erbar, Matthias; Huesmann, Martin

    2014-01-01

    We show that the configuration space over a manifold M inherits many curvature properties of the manifold. For instance, we show that a lower Ricci curvature bound on M implies for the configuration space a lower Ricci curvature bound in the sense of Lott-Sturm-Villani, the Bochner inequality, gradient estimates and Wasserstein contraction. Moreover, we show that the heat flow on the configuration space, or the infinite independent particle process, can be identified as the gradient flow of t...

  19. Entropy bounds for uncollapsed matter

    Energy Technology Data Exchange (ETDEWEB)

    Abreu, Gabriel; Visser, Matt, E-mail: Gabriel.Abreu@msor.vuw.ac.nz, E-mail: Matt.Visser@msor.vuw.ac.nz [School of Mathematics, Statistics and Operation Research Victoria University of Wellington Wellington (New Zealand)

    2011-09-22

    In any static spacetime the quasilocal Tolman mass contained within a volume can be reduced to a Gauss-like surface integral involving the flux of a suitably defined generalized surface gravity. By introducing some basic thermodynamics, and invoking the Unruh effect, one can then develop elementary bounds on the quasilocal entropy that are very similar in spirit to the holographic bound, and closely related to entanglement entropy.

  20. Finite Domain Bounds Consistency Revisited

    OpenAIRE

    Choi, Chiu Wo; Harvey, Warwick; Lee, Jimmy Ho-Man; Stuckey, Peter J.

    2004-01-01

    A widely adopted approach to solving constraint satisfaction problems combines systematic tree search with constraint propagation for pruning the search space. Constraint propagation is performed by propagators implementing a certain notion of consistency. Bounds consistency is the method of choice for building propagators for arithmetic constraints and several global constraints in the finite integer domain. However, there has been some confusion in the definition of bounds consistency. In t...

  1. Ising n-fold integrals as diagonals of rational functions and integrality of series expansions

    International Nuclear Information System (INIS)

    We show that the n-fold integrals χ(n) of the magnetic susceptibility of the Ising model, as well as various other n-fold integrals of the ‘Ising class’, or n-fold integrals from enumerative combinatorics, like lattice Green functions, correspond to a distinguished class of functions generalizing algebraic functions: they are actually diagonals of rational functions. As a consequence, the power series expansions of the, analytic at x = 0, solutions of these linear differential equations ‘derived from geometry’ are globally bounded, which means that after just one rescaling of the expansion variable, they can be cast into series expansions with integer coefficients. We also give several results showing that the unique analytical solution of Calabi–Yau ODEs and, more generally, Picard–Fuchs linear ODEs with solutions of maximal weights are always diagonals of rational functions. Besides, in a more enumerative combinatorics context, generating functions whose coefficients are expressed in terms of nested sums of products of binomial terms can also be shown to be diagonals of rational functions. We finally address the question of the relations between the notion of integrality (series with integer coefficients, or, more generally, globally bounded series) and the modularity of ODEs. (paper)

  2. Consumption Self-Control by Rationing Purchase Quantities of Virtue and Vice

    OpenAIRE

    Klaus Wertenbroch

    1998-01-01

    Consumers' attempts to control their unwanted consumption impulses influence many everyday purchases with broad implications for marketers' pricing policies. Addressing theoreticians and practitioners alike, this paper uses multiple empirical methods to show that consumers voluntarily and strategically ration their purchase quantities of goods that are likely to be consumed on impulse and that therefore may pose self-control problems. For example, many regular smokers buy their cigarettes by ...

  3. Can we Rationally Learn to Coordinate?

    NARCIS (Netherlands)

    S. Goyal (Sanjeev); M.C.W. Janssen (Maarten)

    1996-01-01

    textabstractIn this paper we examine the issue whether individual rationality considerations are sufficient to guarantee that individuals will learn to coordinate. This question is central in any discussion of whether social phenomena (read: conventions) can be explained in terms of a purely individ

  4. Rationality, Theory Acceptance and Decision Theory

    Directory of Open Access Journals (Sweden)

    J. Nicolas Kaufmann

    1998-06-01

    Full Text Available Following Kuhn's main thesis according to which theory revision and acceptance is always paradigm relative, I propose to outline some possible consequences of such a view. First, asking the question in what sense Bayesian decision theory could serve as the appropriate (normative theory of rationality examined from the point of view of the epistemology of theory acceptance, I argue that Bayesianism leads to a narrow conception of theory acceptance. Second, regarding the different types of theory revision, i.e. expansion, contraction, replacement and residuals shifts, I extract from Kuhn's view a series of indications showing that theory replacement cannot be rationalized within the framework of Bayesian decision theory, not even within a more sophisticated version of that model. Third, and finally, I will point to the need for a more comprehensive model of rationality than the Bayesian expected utility maximization model, the need for a model which could better deal with the different aspects of theory replacement. I will show that Kuhn's distinction between normal and revolutionary science gives us several hints for a more adequate theory of rationality in science. I will also show that Kuhn is not in a position to fully articulate his main ideas and that he well be confronted with a serious problem concerning collective choice of a paradigm.

  5. Rational function optimization using genetic algorithms

    Science.gov (United States)

    Valadan Zoej, M. J.; Mokhtarzade, M.; Mansourian, A.; Ebadi, H.; Sadeghian, S.

    2007-12-01

    In the absence of either satellite ephemeris information or camera model, rational functions are introduced by many investigators as mathematical model for image to ground coordinate system transformation. The dependency of this method on many ground control points (GCPs), numerical complexity, particularly terms selection, can be regarded as the most known disadvantages of rational functions. This paper presents a mathematical solution to overcome these problems. Genetic algorithms are used as an intelligent method for optimum rational function terms selection. The results from an experimental test carried out over a test field in Iran are presented as utilizing an IKONOS Geo image. Different numbers of GCPs are fed through a variety of genetic algorithms (GAs) with different control parameter settings. Some initial constraints are introduced to make the process stable and fast. The residual errors at independent check points proved that sub-pixel accuracies can be achieved even when only seven and five GCPs are used. GAs could select rational function terms in such a way that numerical problems are avoided without the need to normalize image and ground coordinates.

  6. The Assessment of Rational Thinking: IQ ? RQ

    Science.gov (United States)

    Stanovich, Keith E.; West, Richard F.

    2014-01-01

    In this article the authors argue that distinguishing between rationality and intelligence helps explain how people can be, at the same time, intelligent and irrational (Stanovich, 2009). As such, researchers need to study separately the individual differences in cognitive skills that underlie intelligence and the individual differences in…

  7. Rigid pricing and rationally inattentive consumer

    Czech Academy of Sciences Publication Activity Database

    Matějka, Filip

    2010-01-01

    Roč. 20, č. 2 (2010), s. 1-40. ISSN 1211-3298 R&D Projects: GA MŠk LC542 Institutional research plan: CEZ:AV0Z70850503 Keywords : rational inattention * nominal rigidity Subject RIV: AH - Economics http://www.cerge-ei.cz/pdf/wp/Wp409.pdf

  8. Rationing in the presence of baselines

    DEFF Research Database (Denmark)

    Hougaard, Jens Leth; Moreno-Ternero, Juan D.; Østerdal, Lars Peter

    2013-01-01

    sector, water distribution in drought periods). We introduce (and characterize) a natural class of allocation methods for this model. Any method within the class is associated with a rule in the standard rationing model, and we show that if the latter obeys some focal properties, the former obeys them...

  9. Rational Landen transformations on mathbb{R}

    Science.gov (United States)

    Manna, Dante; Moll, Victor H.

    2007-12-01

    The Landen transformation (a,b) mapsto ( (a+b)/2,sqrt{ab} ) preserves the value of an elliptic integral, and its iteration produces the classical arithmetic-geometric mean AGM (a,b) . We present analogous transformations for rational functions integrated over the whole real line.

  10. Einstein Metrics on Rational Homology Spheres

    OpenAIRE

    Boyer, Charles P.; Galicki, Krzysztof

    2003-01-01

    We prove the existence of Sasakian-Einstein metrics on infinitely many rational homology spheres in all odd dimensions greater than 3. In dimension 5 we obain somewhat sharper results. There are examples where the number of effective parameters in the Einstein metric grows exponentially with dimension.

  11. Towards a formal logic of design rationalization

    DEFF Research Database (Denmark)

    Galle, Per

    1997-01-01

    Certain extensions to standard predicate logic are proposed and used as a framework for critical logical study of patterns of inference in design reasoning. It is shown that within this framework a modal logic of design rationalization (suggested by an empirical study reported earlier) can be for...

  12. Medicine, ethics and religion: rational or irrational?

    Science.gov (United States)

    Orr, R D; Genesen, L B

    1998-12-01

    Savulescu maintains that our paper, which encourages clinicians to honour requests for "inappropriate treatment" is prejudicial to his atheistic beliefs, and therefore wrong. In this paper we clarify and expand on our ideas, and respond to his assertion that medicine, ethics and atheism are objective, rational and true, while religion is irrational and false. PMID:9873978

  13. Medicine, ethics and religion: rational or irrational?

    OpenAIRE

    Orr, R D; Genesen, L B

    1998-01-01

    Savulescu maintains that our paper, which encourages clinicians to honour requests for "inappropriate treatment" is prejudicial to his atheistic beliefs, and therefore wrong. In this paper we clarify and expand on our ideas, and respond to his assertion that medicine, ethics and atheism are objective, rational and true, while religion is irrational and false.

  14. The Rational Optimist: How Prosperity Evolves

    OpenAIRE

    Matt Ridley

    2012-01-01

    There is much debate about the state of the world. Matt Ridley argues in The Rational Optimist that we can solve problems such as economic crashes,population explosions, climate change and terrorism, of poverty, AIDS, depression and obesity. His trust of capitalism and progress is examined and challenged  in this book review.

  15. The Rational Optimist: How Prosperity Evolves

    Directory of Open Access Journals (Sweden)

    Matt Ridley

    2012-05-01

    Full Text Available There is much debate about the state of the world. Matt Ridley argues in The Rational Optimist that we can solve problems such as economic crashes,population explosions, climate change and terrorism, of poverty, AIDS, depression and obesity. His trust of capitalism and progress is examined and challenged  in this book review.

  16. Rationally inattentive seller: sales and discrete pricing

    Czech Academy of Sciences Publication Activity Database

    Matějka, Filip

    2010-01-01

    Roč. 20, č. 1 (2010), s. 89-146. ISSN 1211-3298 R&D Projects: GA MŠk LC542 Institutional research plan: CEZ:AV0Z70850503 Keywords : rational inattention * nominal rigidity * sales Subject RIV: AH - Economics http://www.cerge-ei.cz/pdf/wp/Wp408.pdf

  17. Lectures on RCFT [Rational Conformal Field Theory

    International Nuclear Information System (INIS)

    We review some recent results in two dimensional Rational Conformal Field Theory. We discuss these theories as a generalization of group theory. The relation to a three dimensional topological theory is explained and the particle example of Chern-Simons-Witten theory is analyzed in detail. This study leads to a natural conjecture regarding the classification of all RCFT's. 62 refs

  18. Rational use of energy. Rationelle Energieverwendung

    Energy Technology Data Exchange (ETDEWEB)

    Bradke, H. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Eichhammer, W. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Gruber, E. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Herz, H. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Jochem, E. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Mannsbart, W. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Reichert, J. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Schlomann, B. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Seidell, M. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Germany)); Walz, R. (Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung, Karlsruhe (Ge

    1993-04-01

    The large field of application of rational use of energy does not allow to report about all technical innovations. The report will rather be selective and exemplary. But the authors plan to change the focus in the different technical areas and trades in next years' annual reports. This review follows last year's description of the individual sectors. (orig.)

  19. Should Teachers be Taught to be Rational?

    Science.gov (United States)

    Floden, Robert E.; Feiman, Sharon

    Teacher education programs have often attempted to make teachers more rational by use of apriori models. These models poorly correspond to teachers' thinking styles. Three distinct reactions to this problem have occurred. One proposed solution is to break the apriori model into separate component skills and to train teachers in each skill. A…

  20. Competitive equilibrium hyperinflation under rational expectations

    OpenAIRE

    Sallum, Elvia Mureb; Barbosa, Fernando de Holanda; Cunha, Alexandre Barros da

    2005-01-01

    This paper shows that a competitive equilibrium model, where a representative agent maximizes welfare, expectations are rational and markets are in equilibrium can account for several hyperinflation stylized facts. The theory is built by combining two hypotheses, namely, a fiscal crisis that requires printing money to finance an increasing public deficit and a predicted change in an unsustainable fiscal regime.

  1. Analytical results for dynamic rational inattention problems

    Czech Academy of Sciences Publication Activity Database

    Maćkowiak, B.; Matějka, Filip; Wiederholt, M.

    St. Louis, MO: IDEAS, 2015, s. 1-5. [Annual Meeting of the Society for Economic Dynamics /2015/. Warsaw (PL), 25.06.2015-27.06.2015] Institutional support: PRVOUK-P23 Keywords : rational inattention Subject RIV: AH - Economics https ://www.economicdynamics.org/meetpapers/2015/paper_1316.pdf

  2. Analytical results for dynamic rational inattention problems

    Czech Academy of Sciences Publication Activity Database

    Maćkowiak, B.; Matějka, Filip; Wiederholt, M.

    St. Louis, MO: IDEAS, 2015, s. 1-5. [Annual Meeting of the Society for Economic Dynamics /2015/. Warsaw (PL), 25.06.2015-27.06.2015] Institutional support: RVO:67985998 Keywords : rational inattention Subject RIV: AH - Economics https ://www.economicdynamics.org/meetpapers/2015/paper_1316.pdf

  3. Summary Report on Rational Cryptographic Protocols

    DEFF Research Database (Denmark)

    Alwen, Joël; Cachin, Christian; Pereira, Olivier;

    This report gives an overview of some of the models and techniques in rational cryptography, an emerging research area which in particular uses the methodologies and techniques of game theory to analyze cryptographic protocols and which uses cryptographic protocol theory to implement game theoretic...

  4. Rationality and its limits in Arianism

    Directory of Open Access Journals (Sweden)

    Birjukov, Dmitry

    2008-06-01

    Full Text Available Having considered certain recurrent issues, such as the idea of comprehensibility of God and apopahtic theology, Dmitry Birjukov (Russian Christian Academy, St. Petersburg looks at the rational tendencies in Arianism and, on the basis of available data, shows how from Arius and Asterius to the Neo-Arians the rationalist tendencies in theology gradually increase while apophatic element virtually disappears.

  5. On a Generalization of Kingman's Bounds

    OpenAIRE

    Liu, Zhen; Nain, Philippe; Towsley, Don

    1994-01-01

    In this paper we develop a framework for computing upper and lower bounds of an exponential form for a class of single server queueing systems with non-renewal inputs. These bounds generalize Kingman's bounds for queues with renewal inputs.

  6. Public managers as multi-rational managers : Propositions on the effective management of multiple rationalities

    OpenAIRE

    Schedler, Kuno

    2012-01-01

    The increasing blurring of the borders between government and non-government organisation forms in the provision of public services leads to new types of organisations. More and more, however, hybrid forms emerge in which there are not only clashes between different interests but also between differing rationalities. This paper focuses on the permanent phenomenon of multiple rationalities in hybrid organisations and attempts to structure it. In doing so, it develops a semantics for the observ...

  7. Symbolic Computation of the Orthogonal Projection of Rational Curves onto Rational Parameterized Surfaces

    Directory of Open Access Journals (Sweden)

    Zhiwang Gan

    2015-01-01

    Full Text Available This paper focuses on the orthogonal projection of rational curves onto rational parameterized surface. Three symbolic algorithms are developed and studied. One of them, based on regular systems, is able to compute the exact parametric loci of projection. The one based on Gröbner basis can compute the minimal variety that contains the parametric loci. The remaining one computes a variety that contains the parametric loci via resultant. Examples show that our algorithms are efficient and valuable.

  8. Improved Range Searching Lower Bounds

    DEFF Research Database (Denmark)

    Larsen, Kasper Green; Nguyen, Huy L.

    2012-01-01

    range reporting problem. In approximate simplex range reporting, points that lie within a distance of ε ⋅ Diam(s) from the border of a query simplex s, are free to be included or excluded from the output, where ε ≥ 0 is an input parameter to the range searching problem. We prove our lower bounds......Table of Contents -------------------------------------------------------------------------------- In this paper we present a number of improved lower bounds for range searching in the pointer machine and the group model. In the pointer machine, we prove lower bounds for the approximate simplex...... by constructing a hard input set and query set, and then invoking Chazelle and Rosenberg's [CGTA'96] general theorem on the complexity of navigation in the pointer machine. For the group model, we show that input sets and query sets that are hard for range reporting in the pointer machine (i.e. by Chazelle...

  9. Simulation bounds for system availability

    International Nuclear Information System (INIS)

    System availability is a dominant factor in the practicality of nuclear power electrical generating plants. A proposed model for obtaining either lower bounds or interval estimates on availability uses observed data on ''n'' failure-to-repair cycles of the system to estimate the parameters in the time-to-failure and time-to-repair models. These estimates are then used in simulating failure/repair cycles of the system. The availability estimate is obtained for each of 5000 samples of ''n'' failure/repair cycles to form a distribution of estimates. Specific percentile points of those simulated distributions are selected as lower simulation bounds or simulation interval bounds for the system availability. The method is illustrated with operational data from two nuclear plants for which an exponential time-to-failure and a lognormal time-to-repair are assumed

  10. Refining Castelnuovo-Halphen bounds

    CERN Document Server

    Di Gennaro, Vincenzo

    2011-01-01

    Fix integers $r,d,s,\\pi$ with $r\\geq 4$, $d\\gg s$, $r-1\\leq s \\leq 2r-4$, and $\\pi\\geq 0$. Refining classical results for the genus of a projective curve, we exhibit a sharp upper bound for the arithmetic genus $p_a(C)$ of an integral projective curve $C\\subset {\\mathbb{P}^r}$ of degree $d$, assuming that $C$ is not contained in any surface of degree $ \\pi$. Next we discuss other types of bound for $p_a(C)$, involving conditions on the entire Hilbert polynomial of the integral surfaces on which $C$ may lie.

  11. Space-bounded communication complexity

    DEFF Research Database (Denmark)

    Brody, Joshua Eric; Chen, Shiteng; Papakonstantinou, Periklis A.;

    2013-01-01

    In the past thirty years, Communication Complexity has emerged as a foundational tool to proving lower bounds in many areas of computer science. Its power comes from its generality, but this generality comes at a price---no superlinear communication lower bound is possible, since a player may...... communicate his entire input. However, what if the players are limited in their ability to recall parts of their interaction? We introduce memory models for 2-party communication complexity. Our general model is as follows: two computationally unrestricted players, Alice and Bob, each have s(n) bits of memory...

  12. Bounding solutions of Pfaff equations

    OpenAIRE

    Esteves, E.; Kleiman, S

    2003-01-01

    Let \\omega be a Pfaff system of differential forms on a projective space. Let S be its singular locus, and Y a solution of \\omega=0. We prove Y\\cap S is of codimension at most 1 in Y, just as Jouanolou suspected; he proved this result assuming \\omega is completely integrable, and asked if the integrability is, in fact, needed. Furthermore, we prove a lower bound on the Castelnuovo--Mumford regularity of Y\\cap S. As in two related articles, we derive upper bounds on numerical invariants of Y, ...

  13. Bound orbits and gravitational theory

    OpenAIRE

    Dadhich, Naresh; Ghosh, Sushant G.(School of Mathematical Sciences, University of KwaZulu-Natal, Westville, 4000, Durban, South Africa); Jhingan, Sanjay

    2013-01-01

    It can be easily shown that bound orbits around a static source can exist only in 4 dimension and in none else for any long range force. This is so not only for Maxwell's electromagnetic and Newton's gravity but also for Einstein's gravitation theory. In contrast to Maxwell's electrodynamics and Newton's gravity, GR has a natural higher dimensional generalization in Lovelock gravity which remarkably admits bound orbits around a static black hole in all even d=2N+2 dimensions where $N$ is degr...

  14. Values-intuitive rational action: the dynamic relationship of instrumental rationality and values insights as a form of social action.

    Science.gov (United States)

    Woods, P A

    2001-12-01

    This paper is concerned with the implications for conceptualizing social action which arise from a consideration of whether human beings are capable of knowing ultimate (universal, unconditionally valid) values. This issue is framed within the view that the validity of our understanding of social action is inextricably linked with the validity of our conception of humankind: the scope and variety of social action has potentialities and limitations that are inscribed by the nature of human beings qua human beings. The paper suggests an enlargement, through the addition of a proposed conceptual tool, of the framework that comprises Weber's typology of social action. It argues that the common human properties of the person in whom social action is embedded should not arbitrarily exclude questions of the genesis of values. An analytical argument is put forward through an examination of the extent to which a faculty for values insights is implicated in Weber's concept of charisma and ethical analysis of political leadership. The notion of values-intuitive rational action is then outlined and discussed. The analytical argument is supported by theorizing from developmental psychology and examples of such action are given. Methodological difficulties in investigating the latter and the interrelationship of such action with institutional and social contexts are briefly discussed. PMID:11853064

  15. Development of the Rational Behavior Inventory: Initial Validity and Reliability

    Science.gov (United States)

    Shorkey, Clayton T.; Whiteman, Victor L.

    1977-01-01

    The results of initial validity and reliability studies on the Rational Behavior Inventory are presented. The instrument was developed to be used for assessment, treatment planning, and evaluation of clients by counselors who use Rational Emotive Therapy. (Author/JKS)

  16. Rational Orbits around Charged Black Holes

    CERN Document Server

    Misra, Vedant

    2010-01-01

    We show that all eccentric timelike orbits in Reissner-Nordstr\\"{o}m spacetime can be classified using a taxonomy that draws upon an isomorphism between periodic orbits and the set of rational numbers. By virtue of the fact that the rationals are dense, the taxonomy can be used to approximate aperiodic orbits with periodic orbits. This may help reduce computational overhead for calculations in gravitational wave astronomy. Our dynamical systems approach enables us to study orbits for both charged and uncharged particles in spite of the fact that charged particle orbits around a charged black hole do not admit a simple one-dimensional effective potential description. Finally, we show that comparing periodic orbits in the RN and Schwarzschild geometries enables us to distinguish charged and uncharged spacetimes by looking only at the orbital dynamics.

  17. Principles of ration formulation for ruminants

    International Nuclear Information System (INIS)

    Feeding standards as practiced in developed countries could be misleading when non-conventional feed resources are used in formulating rations for ruminant livestock in developing countries. They tend to reject the poor quality feeds that are available in vast quantities. The non-availability of good quality forage throughout the year and the need to optimise the efficiency of utilisation of locally available feed resources have lead to the application of basic nutritional principles when considering ration formulation. The alternative approach to the use of feeding standards would be to ensure that the production system matches the available resources. The development of feed supplementation strategies based on locally available feed resources require the understanding of the relative roles and nutrient needs of the two-compartment system represented by the micro-organisms in the rumen and the host animal. (author)

  18. On the Rationality of Pluralistic Ignorance

    DEFF Research Database (Denmark)

    Bjerring, Jens Christian Krarup; Hansen, Jens Ulrik; Pedersen, Nikolaj Jang Lee Linding

    2014-01-01

    Pluralistic ignorance is a socio-psychological phenomenon that involves a systematic discrepancy between people’s private beliefs and public behavior in cer- tain social contexts. Recently, pluralistic ignorance has gained increased attention in formal and social epistemology. But to get clear on...... what precisely a formal and social epistemological account of pluralistic ignorance should look like, we need answers to at least the following two questions: What exactly is the phenomenon of pluralistic ignorance? And can the phenomenon arise among perfectly rational agents? In this paper, we propose...... social interactive aspects of the phenomenon. Second, given our characterization of pluralistic ignorance, we argue that the phenomenon can indeed arise in groups of perfectly rational agents. This, in turn, ensures that the tools of formal epistemology can be fully utilized to reason about pluralistic...

  19. Foundations of Rational Quantum Field Theory, I

    CERN Document Server

    Gepner, D

    1992-01-01

    The connection between Rational Conformal Field Theory (RCFT), $N=2$ massive supersymmetric field theory, and solvable Interaction Round the Face (IRF) lattice models is explored here. Specifically, one identifies the fusion rings with the chiral rings. The theories so obtained are conjectured, and largely shown, to be integrable. A variety of examples and the structure of the metric in moduli space are given. The kink scattering theory is given by the Boltzmann weights of an IRF model, which is built entirely in terms of the conformal data of the original RCFT. This procedure produces all solvable IRF models in terms of projection operators of the RCFT. The soliton structure and their scattering amplitudes are described. A host of new rational conformal field theories are constructed generalizing most, if not all, of the known ones.

  20. Rational Instability in the Natural Coalition Forming

    CERN Document Server

    Vinogradova, Galina

    2012-01-01

    We are investigating a paradigm of instability in coalition forming among countries, which indeed is intrinsic to any collection of individual groups or other social aggregations. Coalitions among countries are formed by the respective attraction or repulsion caused by the historical bond propensities between the countries, which produced an intricate circuit of bilateral bonds. Contradictory associations into coalitions occur due to the independent evolution of the bonds. Those coalitions tend to be unstable and break down frequently. The model extends some features of the physical theory of Spin Glasses. Within the frame of this model, the instability is viewed as a consequence of decentralized maximization processes searching for the best coalition allocations. In contrast to the existing literature, a rational instability is found to result from forecast rationality of countries. Using a general theoretical framework allowing to analyze the countries' decision making in coalition forming, we feature a sys...

  1. Rational Thinking and Reasonable Thinking in Physics

    Directory of Open Access Journals (Sweden)

    Isaeva E. A.

    2008-04-01

    Full Text Available The usual concept of space and time, based on Aristotle’s principle of contemplation of the world and of the absoluteness of time, is a product of rational thinking. At the same time, in philosophy, rational thinking differs from reasonable thinking; the aim of logic is to distinguish finite forms from infinite forms. Agreeing that space and time are things of infinity in this work, we shall show that, with regard to these two things, it is necessary to apply reasonable thinking. Spaces with non-Euclidean geometry, for example Riemannian and Finslerian spaces, in particular, the space of the General Theory of the Relativity (four-dimensional pseudo-Riemannian geometry and also the concept of multi-dimensional space-time are products of reasonable thinking. Consequently, modern physical experiment not dealing with daily occurrences (greater speeds than a low speed to the velocity of light, strong fields, singularities, etc. can be covered only by reasonable thinking.

  2. . MODERN EDUCATION: FROM RATIONALITY TO REASONABLENESS

    Directory of Open Access Journals (Sweden)

    O. S. Anisimov

    2014-01-01

    Full Text Available The paper deals with the problem of modern education development and criticizes a pragmatic attitude to education. Based on the retrospective historical analysis, the author maintains that educational systems are generally focused on fostering the pragmatic intellect rather than reasoning, which leads to a superficial world perception, and undermines personal analytical potential and capability of strategic problem solving. Concentration on rationality is unlikely to provide a way out of the world crisis. In the author’s view, education demands both the deep and solid comprehension of existential concepts and the reference to the “absolute spirit” of Confucius, Plato, Kant and Hegel. The research is aimed at justifying the civilizational paradigm of education on the basis of Hegelian fundamental ideas of intellectual perception with the emphasis on reasonability instead of rationality. As the most adequate implementation instrument, the author suggests a game simulating technique that combines the benefits of philosophical, scientific and methodological thinking.

  3. Rational Conformal Field Theories and Complex Multiplication

    CERN Document Server

    Gukov, S G; Gukov, Sergei; Vafa, Cumrun

    2004-01-01

    We study the geometric interpretation of two dimensional rational conformal field theories, corresponding to sigma models on Calabi-Yau manifolds. We perform a detailed study of RCFT's corresponding to T^2 target and identify the Cardy branes with geometric branes. The T^2's leading to RCFT's admit ``complex multiplication'' which characterizes Cardy branes as specific D0-branes. We propose a condition for the conformal sigma model to be RCFT for arbitrary Calabi-Yau n-folds, which agrees with the known cases. Together with recent conjectures by mathematicians it appears that rational conformal theories are not dense in the space of all conformal theories, and sometimes appear to be finite in number for Calabi-Yau n-folds for n>2. RCFT's on K3 may be dense. We speculate about the meaning of these special points in the moduli spaces of Calabi-Yau n-folds in connection with freezing geometric moduli.

  4. Rational Thinking and Reasonable Thinking in Physics

    Directory of Open Access Journals (Sweden)

    Isaeva E. A.

    2008-04-01

    Full Text Available The usual concept of space and time, based on Aristotle's principle of contemplation of the world and of the absoluteness of time, is a product of rational thinking. At the same time, in philosophy, rational thinking differs from reasonable thinking; the aim of logic is to distinguish finite forms from infinite forms. Agreeing that space and time are things of infinity in this work, we shall show that, with regard to these two things, it is necessary to apply reasonable thinking. Spaces with non-Euclidean geometry, for example Riemannian and Finslerian spaces, in particular, the space of the General Theory of the Relativity (four-dimensional pseudo-Riemannian geometry and also the concept of multi-dimensional space-time are products of reasonable thinking. Consequently, modern physical experiment not dealing with daily occurrences (greater speeds than a low speed to the velocity of light, strong fields, singularities, etc. can be covered only by reasonable thinking.

  5. Heuristic Search in Bounded-depth Trees: Best-Leaf-First Search

    OpenAIRE

    Ruml, Wheeler

    2002-01-01

    Many combinatorial optimization and constraint satisfaction problems can be formulated as a search for the best leaf in a tree of bounded depth. When exhaustive enumeration is infeasible, a rational strategy visits leaves in increasing order of predicted cost. Previous systematic algorithms for this setting follow a predetermined search order, making strong implicit assumptions about predicted cost and using problem-specific information inefficiently. We introduce a framework, best-leaf-first...

  6. Upper bound and formula for class numbers of abelian function fields

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    For any abelian function field K ( i. e. any subfield of a cyclotomic function field L = k (AP) over the rational function field k ) with conductor being an irreducible polynomial over a finite field of odd characteristic, by studying the Carlitz-module structure and the character group of K, an explicit upper bound and a calculating formula of the relative divisor class number h - (K) of K are given. Our calculated results of K develop Rosen's recent results of L.

  7. The rational design of topical formulations

    OpenAIRE

    Duszynska-Krupa, A. M.

    2015-01-01

    This thesis addresses the development of topical formulations designed to treat atopic dermatitis (AD) using nicotinamide (NA). A rational approach to the development of topical formulations based on the physical and chemical properties of the drug and vehicle components is studied. This approach is an alternative to the model of formulation development where the drug is added into an existing vehicle without optimisation of the formulation in terms of the active delivery to its site of actio...

  8. Firm's R & D Behavior Under Rational Expectations

    OpenAIRE

    Lakshmi K. Raut

    1997-01-01

    This paper formulates dynamic R&D investment decisions of private firms as an optimal stochastic control problem. It derives explicitly R&D investment decision rule and the cross equations parameter restrictions imposed by the rational expectations hypothesis, using the Riccati equations only and not requiring the use of Wiener-Kolmogorov prediction formula. Idenfitication and estimation of the structural parameters are essential for evaluating policies such as R&D subsidies, firm size, marke...

  9. Cognitive characteristics affecting rational decision making style

    OpenAIRE

    2011-01-01

    Abstract Decision making is one of the most important and frequent tasks among managers and employees in an organization. Knowledge about more stable cognitive characteristics underlying decision making styles has been requested. This study aimed to examine the relationship between rational decision making style, cognitive style, self efficacy and locus of control. Possible interaction effects in relation to gender were also analyzed. 186 employees at the Ministry of Defence were surveyed...

  10. Picard groups in rational conformal field theory

    OpenAIRE

    Fröhlich, J.; Fuchs, J.; Runkel, I.; Schweigert, C.

    2005-01-01

    Algebra and representation theory in modular tensor categories can be combined with tools from topological field theory to obtain a deeper understanding of rational conformal field theories in two dimensions: It allows us to establish the existence of sets of consistent correlation functions, to demonstrate some of their properties in a model-independent manner, and to derive explicit expressions for OPE coefficients and coefficients of partition functions in terms of invariants of links in t...

  11. Explaining money laundering with rational choice theory

    OpenAIRE

    Nunes, Monica Maria; Kwan, Ming-tak, Kalwan; Singh, Rajvinder; Tam, Wai-shun, Wilson; 羅嘉雯; 譚威信

    2014-01-01

    This research aims to explore if rational choice theory can be applied to explain money laundering in Hong Kong by drawing on the characteristics of stooges and their motives for colluding in money laundering activities and the effectiveness of imprisonment or other forms of punishments as a means of deterrence. An actor has limited cognitive capacity, makes decisions based on incomplete information and his actions reflect personal optimal beliefs (Piquero and Tibbetts, 2002; Hindmoor, 2006)...

  12. Individual Expectations, Limited Rationality and Aggregate Outcomes

    OpenAIRE

    Bao, Te; Hommes, Cars; Sonnemans, Joep; Tuinstra, Jan

    2012-01-01

    This discussion paper led to a publication in the Journal of Economic Dynamics & Control. Volume 36(8), pp. 1101-1120. Recent studies suggest that the type of strategic environment or expectation feedback can have a large impact on whether the market can learn the rational fundamental price. We present an experiment where the fundamental price experiences large unexpected shocks. Markets with negative expectation feedback (strategic substitutes) quickly converge to the new fundamental, while ...

  13. Beyond dogmatism: Rationality in theology and science

    OpenAIRE

    Wentzel van Huyssteen

    1988-01-01

    The justification of cognitive claims in theology can be dealt with adequately only if the epistemological issues of metaphorical reference, experiential adequacy and explanatory progress are seen as crucial problems for the more encompassing problem of rationality in theology. To claim some form of reality depiction the theologian will have to argue for a plausible theory of reference on the basis of interpreted religious experience. In this discussion important analogies between the rationa...

  14. Dynamic factor demands under rational expectations

    OpenAIRE

    Robert S. Pindyck; Rotemberg, Julio

    1982-01-01

    This paper presents a dynamic model of the industrial demands for structures, equipment, and blue- and white-collar labor. Our approach is consistent with producers holding rational expectations and optimizing dynamically in the presence of adjustment costs, yet it permits generality of functional form regarding the technology. We represent the technology by atranslog input requirement function that specifies the amount of blue-collar labor (a flexible factor) the firm must hire to produce a ...

  15. Macro-Economic Equilibrium and Credit Rationing

    OpenAIRE

    Stiglitz, Joseph E.; Andrew Weiss

    1987-01-01

    In this paper we investigate the macro-economic equilibria of an economy in which credit contracts have both adverse selection and incentive effects. The terms of credit contracts include both an interest rate and a collateral requirement. We show that in this richer model all types of borrowers may be rationed. Interest rates charged borrowers may move either pro or counter-cyclically. If pro-cyclical shocks have a greater effect on the success probabilities of risky techniques than on safe ...

  16. Multiple Shooting in Rational Expectations Models

    OpenAIRE

    David Lipton; James M. Poterba; Jeffrey Sachs; Summers, Lawrence H.

    1983-01-01

    This note describes an algorithm for the solution of rational expectations models with saddlepoint stability properties. The algorithm is based on the method of multiple shooting, which is widely used to solve mathematically similar problems in the physical sciences. Potential applications to economics include models of capital accumulation and valuation, money arid growth, exchange rate determination, and macroeconomic activity. In general, whenever an asset price incorporates information ab...

  17. Rational Expectations Equilibria: Existence and Representation

    OpenAIRE

    Bhowmik, Anuj; Cao, Jiling

    2015-01-01

    In this paper, we continue to explore the equilibrium theory under ambiguity. For a model of a pure exchange and asymmetric information economy with a measure space of agents whose exogenous uncertainty is described by a complete probability space, we establish a representation theorem for a Bayesian or maximin rational expectations equilibrium allocation in terms of a state-wise Walrasian equilibrium allocation. This result also strengthens the theorems on the existence and representation of...

  18. Liquid mixture viscosities correlation with rational models

    Directory of Open Access Journals (Sweden)

    Knežević-Stevanović Anđela B.

    2014-01-01

    Full Text Available In this paper twenty two selected rational correlation models for liquid mixture viscosities of organic compounds were tested on 219 binary sets of experimental data taken from literature. The binary sets contained 3675 experimental data points for 70 different compounds. The Dimitrov-Kamenski X, Dimitrov-Kamenski XII, and Dimitrov-Kamenski XIII models demonstrated the best correlative characteristics for binary mixtures with overall absolute average deviation less then 2%. [Projekat Ministarstva nauke Republike Srbije, br. 172063

  19. Qualitative behavior of a rational difference equation

    Directory of Open Access Journals (Sweden)

    Qian Xiao

    2011-01-01

    Full Text Available Abstract This article is concerned with the following rational difference equation yn+1 = (yn + yn-1/(p + ynyn-1 with the initial conditions; y-1, y0 are arbitrary positive real numbers, and p is positive constant. Locally asymptotical stability and global attractivity of the equilibrium point of the equation are investigated, and non-negative solution with prime period two cannot be found. Moreover, simulation is shown to support the results.

  20. ECOLOGICAL BASIS FOR RATIONAL PHAGE THERAPY

    OpenAIRE

    Letarov, A.; Golomidova, A.; Tarasyan, K.

    2010-01-01

    Understanding the mutual interactions of bacterial and phage populations in the environment of a human or animal body is essential in any attempt to influence these complex processes, particularly for rational phage therapy. Current knowledge on the impact of naturally occurring bacteriophages on the populations of their host bacteria, and their role in the homeostasis maintenance of a macro host, is still sketchy. The existing data suggest that different mechanisms stabilize phage–bacteria c...

  1. NEVILLE-TYPE VECTOR VALUED RATIONAL INTERPOLANTS

    Institute of Scientific and Technical Information of China (English)

    陈之兵; 顾传青; 徐晨

    2004-01-01

    A new kind of vector valued rational interpolants is established by means of Samelson inverse, with scalar numerator and vector valued denominator. It is essen tially different from that of Graves-Morris(1983), where the interpolants are constructed by Thiele-type continued fractions with vector valued numerator and scalar denominator. The new approach is more suitable to calculate the value of a vector valued function for a given point. And an error formula is also given and proven.

  2. Treating Yourself Instrumentally: Internalization, Rationality and Law

    OpenAIRE

    Cooter, Robert D.

    2003-01-01

    Economics, which has greatly advanced deterrence theory, has made no contribution to understanding how law changes peoples’ values. I combine economics and psychology to offer the framework for such a theory. Rational self-development involves treating yourself as the means to achieve your ends. Pursing ends changes objective opportunities and subjective values. The theory of cognitive dissonance predicts how changing opportunities changes values. If the connection between opportunities and...

  3. Computational birational geometry of minimal rational surfaces

    OpenAIRE

    Brown, Gavin; Kasprzyk, Alexander; Ryder, Daniel

    2009-01-01

    The classification of minimal rational surfaces and the birational links between them by Iskovskikh, Manin and others is a well-known subject in the theory of algebraic surfaces. We explain algorithms that realise links of type II between minimal del Pezzo surfaces, one of the major classes of birational links, and we describe briefly how this fits into a large project to implement the results of Iskovskikh's programme in Magma.

  4. Precis of Bayesian Rationality: The Probabilistic Approach to Human Reasoning

    OpenAIRE

    Oaksford, M.; Chater, N.

    2009-01-01

    According to Aristotle, humans are the rational animal. The borderline between rationality and irrationality is fundamental to many aspects of human life including the law, mental health, and language interpretation. But what is it to be rational? One answer, deeply embedded in the Western intellectual tradition since ancient Greece, is that rationality concerns reasoning according to the rules of logic - the formal theory that specifies the inferential connections that hold with certainty be...

  5. Thinking about acting logical foundations for rational decision making

    CERN Document Server

    Pollock, John L

    2006-01-01

    John Pollock aims to construct a theory of rational decision making for real agents--not ideal agents. Real agents have limited cognitive powers, but traditional theories of rationality have applied only to idealized agents that lack such constraints. Pollock argues that theories of ideal rationality are largely irrelevant to the decision making of real agents. Thinking about Acting aims to provide a theory of ""real rationality.""

  6. The Ethics and Reality of Rationing in Medicine

    OpenAIRE

    Scheunemann, Leslie P.; White, Douglas B.

    2011-01-01

    Rationing is the allocation of scarce resources, which in health care necessarily entails withholding potentially beneficial treatments from some individuals. Rationing is unavoidable because need is limitless and resources are not. How rationing occurs is important because it not only affects individual lives but also expresses society’s most important values. This article discusses the following topics: (1) the inevitability of rationing of social goods, including medical care; (2) types of...

  7. Cox rings of rational surfaces and redundant blow-ups

    OpenAIRE

    Hwang, DongSeon; Park, Jinhyung

    2013-01-01

    We prove that the redundant blow-up preserves the finite generation of the Cox ring of a rational surface under a suitable assumption, and we study the birational structure of Mori dream rational surfaces via redundant blow-ups. It turns out that the redundant blow-up completely characterizes birational morphisms of Mori dream rational surfaces with anticanonical Iitaka dimension $0$. As an application, we construct new Mori dream rational surfaces with anticanonical Iitaka dimension $0$ and ...

  8. Bound states of 'dressed' particles

    International Nuclear Information System (INIS)

    A new approach to the problem of bound states in relativistic quantum field theories is suggested. It uses the creation - destruction operators of 'dresses' particles which have been granted by Faddeev's (1963) 'dressing' formalism. Peculiarities of the proposed approach as compared to the known ones are discussed. 8 refs. (author)

  9. Bounded Densities and Their Derivatives

    DEFF Research Database (Denmark)

    Kozine, Igor; Krymsky, V.

    2009-01-01

    This paper describes how one can compute interval-valued statistical measures given limited information about the underlying distribution. The particular focus is on a bounded derivative of a probability density function and its combination with other available statistical evidence for computing...

  10. Semiclassical bounds in magnetic bottles

    Czech Academy of Sciences Publication Activity Database

    Barseghyan, Diana; Exner, Pavel; Kovařík, H.; Weidl, T.

    2016-01-01

    Roč. 28, č. 1 (2016), s. 1650002. ISSN 0129-055X R&D Projects: GA ČR(CZ) GA14-06818S Institutional support: RVO:61389005 Keywords : magnetic Laplacian * discrete spectrum * eigenvalue bounds Subject RIV: BE - Theoretical Physics Impact factor: 1.329, year: 2014

  11. Unconditional lower bounds against advice

    NARCIS (Netherlands)

    H. Buhrman; L. Fortnow; R. Santhanam

    2009-01-01

    We show several unconditional lower bounds for exponential time classes against polynomial time classes with advice, including: (1) For any constant c, NEXP not in P^{NP[n^c]} (2) For any constant c, MAEXP not in MA/n^c (3) BPEXP not in BPP/n^{o(1)}. It was previously unknown even whether NEXP in NP

  12. Bounded Fixed-Point Iteration

    DEFF Research Database (Denmark)

    Nielson, Hanne Riis; Nielson, Flemming

    1992-01-01

    In the context of abstract interpretation the authors study the number of times a functional needs to be unfolded in order to give the least fixed point. For the cases of total or monotone functions they obtain an exponential bound and in the case of strict and additive (or distributive) functions...

  13. Market Access through Bound Tariffs

    DEFF Research Database (Denmark)

    Sala, Davide; Schröder, Philipp J.H.; Yalcin, Erdal

    WTO negotiations deal predominantly with bound - besides applied - tariff rates. But, how can reductions in tariffs ceilings, i.e. tariff rates that no exporter may ever actually be confronted with, generate market access? The answer to this question relates to the effects of tariff bindings on t...

  14. Market access through bound tariffs

    DEFF Research Database (Denmark)

    Sala, Davide; Schröder, Philipp J.H.; Yalcin, Erdal

    2010-01-01

    WTO negotiations deal predominantly with bound - besides applied - tariff rates. But, how can reductions in tariffs ceilings, i.e. tariff rates that no exporter may ever actually be confronted with, generate market access? The answer to this question relates to the effects of tariff bindings on t...

  15. Improved Bounds for Geometric Permutations

    CERN Document Server

    Rubin, Natan; Sharir, Micha

    2010-01-01

    We show that the number of geometric permutations of an arbitrary collection of $n$ pairwise disjoint convex sets in $\\mathbb{R}^d$, for $d\\geq 3$, is $O(n^{2d-3}\\log n)$, improving Wenger's 20 years old bound of $O(n^{2d-2})$.

  16. Scalable Mechanisms for Rational Secret Sharing

    CERN Document Server

    Dani, Varsha; Saia, Jared

    2012-01-01

    We consider the classical secret sharing problem in the case where all agents are selfish but rational. In recent work, Kol and Naor show that, when there are two players, in the non-simultaneous communication model, i.e. when rushing is possible, there is no Nash equilibrium that ensures both players learn the secret. However, they describe a mechanism for this problem, for any number of players, that is an epsilon-Nash equilibrium, in that no player can gain more than epsilon utility by deviating from it. Unfortunately, the Kol and Naor mechanism, and, to the best of our knowledge, all previous mechanisms for this problem require each agent to send O(n) messages in expectation, where n is the number of agents. This may be problematic for some applications of rational secret sharing such as secure multi-party computation and simulation of a mediator. We address this issue by describing mechanisms for rational secret sharing that are designed for large n. Both of our results hold for n > 2, and are Nash equil...

  17. Rational quantitative safety goals: a summary

    International Nuclear Information System (INIS)

    We introduce the notion of a Rational Quantitative Safety Goal. Such a goal reflects the imprecision and vagueness inherent in any reasonable notion of adequate safety and permits such vagueness to be incorporated into the formal regulatory decision-making process. A quantitative goal of the form, the parameter x, characterizing the safety level of the nuclear plant, shall not exceed the value x0, for example, is of a non-rational nature in that it invokes a strict binary logic in which the parameter space underlying x is cut sharply into two portions: that containing those values of x that comply with the goal and that containing those that do not. Here, we utilize an alternative form of logic which, in accordance with any intuitively reasonable notion of safety, permits a smooth transition of a safety determining parameter between the adequately safe and inadequately safe domains. Fuzzy set theory provides a suitable mathematical basis for the formulation of rational quantitative safety goals. The decision-making process proposed here is compatible with current risk assessment techniques and produces results in a transparent and useful format. Our methodology is illustrated with reference to the NUS Corporation risk assessment of the Limerick Generating Station

  18. Rationality in children: the first steps

    Directory of Open Access Journals (Sweden)

    Andrew Woodfield

    1991-12-01

    Full Text Available Not all categorization is conceptual. Many of the experimental findings concerning infant and animal categorization invite the hypothesis that the subjects form abstract perceptual representations, mental models or cognitive maps that are not composed of concepts. The paper is a reflection upon the idea that conceptual categorization involves the ability to make categorical judgements under the guidance of norms of rationality. These include a norm of truth-seeking and a norm of good evidence. Acceptance of these norms implies willingness to defer to cognitive authorities, unwillingness to commit oneself to contradictions, and knowledge of how to reorganize one's representational system upon discovering that one has made a mistake. It is proposed that the cognitive architecture required for basic rationality is similar to that which underlies pretend-play. The representational system must be able to make room for separate 'mental spaces' in which alternatives to the actual world are entertained. The same feature underlies the ability to understand modalities, time, the appearance-reality distinction, other minds, and ethics. Each area of understanding admits of degrees, and mastery (up to normal adult level takes years. But rational concept-management, at least in its most rudimentary form, does not require a capacity to form second-order representations. It requires knowledge of how to operate upon, and compare, the contents of different mental spaces.

  19. Rational design of nanomaterials for water treatment.

    Science.gov (United States)

    Li, Renyuan; Zhang, Lianbin; Wang, Peng

    2015-11-01

    The ever-increasing human demand for safe and clean water is gradually pushing conventional water treatment technologies to their limits. It is now a popular perception that the solutions to the existing and future water challenges will hinge upon further developments in nanomaterial sciences. The concept of rational design emphasizes on 'design-for-purpose' and it necessitates a scientifically clear problem definition to initiate the nanomaterial design. The field of rational design of nanomaterials for water treatment has experienced a significant growth in the past decade and is poised to make its contribution in creating advanced next-generation water treatment technologies in the years to come. Within the water treatment context, this review offers a comprehensive and in-depth overview of the latest progress in rational design, synthesis and applications of nanomaterials in adsorption, chemical oxidation and reduction reactions, membrane-based separation, oil-water separation, and synergistic multifunctional all-in-one nanomaterials/nanodevices. Special attention is paid to the chemical concepts related to nanomaterial design throughout the review. PMID:26437738

  20. Rational design of nanomaterials for water treatment

    KAUST Repository

    Li, Renyuan

    2015-08-26

    The ever-increasing human demand for safe and clean water is gradually pushing conventional water treatment technologies to their limits and it is now a popular perception that the solutions to the existing and future water challenges will highly hinge upon the further development of nanomaterial sciences. The concept of rational design emphasizes ‘design-for-purpose’ and it necessitates a scientifically clear problem definition to initiate the nanomaterial design. The field of rational design of nanomaterials for water treatment has experienced a significant growth in the past decade and is poised to make its contribution in creating advanced next-generation water treatment technologies in the years to come. Within the water treatment context, this review offers a comprehensive and in-depth overview of the latest progress of the rational design, synthesis and applications of nanomaterials in adsorption, chemical oxidation and reduction reactions, membrane-based separation, oil/water separation, and synergistic multifunctional all-in-one nanomaterials/nanodevices. Special attention is paid on chemical concepts of the nanomaterial designs throughout the review.

  1. Rational design of nanomaterials for water treatment

    Science.gov (United States)

    Li, Renyuan; Zhang, Lianbin; Wang, Peng

    2015-10-01

    The ever-increasing human demand for safe and clean water is gradually pushing conventional water treatment technologies to their limits. It is now a popular perception that the solutions to the existing and future water challenges will hinge upon further developments in nanomaterial sciences. The concept of rational design emphasizes on `design-for-purpose' and it necessitates a scientifically clear problem definition to initiate the nanomaterial design. The field of rational design of nanomaterials for water treatment has experienced a significant growth in the past decade and is poised to make its contribution in creating advanced next-generation water treatment technologies in the years to come. Within the water treatment context, this review offers a comprehensive and in-depth overview of the latest progress in rational design, synthesis and applications of nanomaterials in adsorption, chemical oxidation and reduction reactions, membrane-based separation, oil-water separation, and synergistic multifunctional all-in-one nanomaterials/nanodevices. Special attention is paid to the chemical concepts related to nanomaterial design throughout the review.

  2. Universal Entropy Bound for Rotating Systems

    OpenAIRE

    Hod, Shahar

    1999-01-01

    We conjecture a universal upper bound to the entropy of a rotating system. The entropy bound follows from application of the generalized second law of thermodynamics to an idealized gedanken experiment in which an entropy-bearing rotating system falls into a black hole. This bound is stronger than the Bekenstein entropy bound for non-rotating systems.

  3. Can Shneidman's "Ten Commonalities of Suicide" Accommodate Rational Suicide?

    Science.gov (United States)

    Werth, James L., Jr.

    1996-01-01

    Reviews the concept of rational suicide and compares it with one researcher's list of commonalities of suicide. Claims that the list cannot accommodate rational suicide. Suggests that the list is biased against rational suicide and should be renamed so it cannot be maintained that suicide must be irrational. (RJM)

  4. Rational points on log Fano threefolds over a finite field

    OpenAIRE

    Gongyo, Yoshinori; Nakamura, Yusuke; Tanaka, Hiromu

    2015-01-01

    We prove the $W\\mathcal{O}$-rationality of klt threefolds and the rational chain connectedness of klt Fano threefolds over a perfect field of characteristic $p>5$. As a consequence, any klt Fano threefold over a finite field has a rational point.

  5. The Properties of Rational Modules and Coideal Subalgebras

    Institute of Scientific and Technical Information of China (English)

    张良云

    2000-01-01

    In this paper, we first prove that the dual module of a rational module is still, a rational module, and maximum rational modules keep their exact properties. Then, we give the Maschke theorem of the coideal subalgebra of quasi-Frobenius algebra, and give some equivalent conditions for the ideal subcoalgebra.

  6. The tools of rational product range support

    Directory of Open Access Journals (Sweden)

    A.I. Jakovlev

    2014-09-01

    Full Text Available The aim of the article. The aim of the research is to improve the methodological approaches to support the rational range of products under today's market conditions. The results of the analysis. Planning and optimization of product mix does not lose its relevance under the current economic conditions. One of the most important tasks in planning is to determine the range of rational perspective to the enterprise product lines products. In this connection there is a need to expand the use of methodological approaches to support the range of products. Integrated application of methodological approaches for determining the rationality and balance the range of products increases the validity of economic decision-making in the field of marketing of the company by identifying the correlation between the profitability of product lines and their weight in the total production. Using the margin profit as a criterion for ranking groups of products with the construction of the Pareto chart allows for a more flexible product strategy, which under the current market conditions is a significant competitive advantage for the enterprise. The necessary conditions for the effective implementation of the proposals of the authors are the high level of consistency of the strategic, tactical and operational levels of management at the enterprise, as well as the analysis of the results of marketing research about customer satisfaction of product parameters. The using of Pareto charts and Spearman correlation coefficient provides increased sales volumes, increasing the target market share of the enterprise, improving the company's image, reducing the risk of marketing activities, increase the company's profit. The results of this study give the company an opportunity to identify deficiencies in a timely manner in the activities and to identify the main directions of improvement of management systems and production planning. Prospects of this study are to develop the

  7. The Impact of Menstrual Cycle Phase on Economic Choice and Rationality.

    Science.gov (United States)

    Lazzaro, Stephanie C; Rutledge, Robb B; Burghart, Daniel R; Glimcher, Paul W

    2016-01-01

    It is well known that hormones affect both brain and behavior, but less is known about the extent to which hormones affect economic decision-making. Numerous studies demonstrate gender differences in attitudes to risk and loss in financial decision-making, often finding that women are more loss and risk averse than men. It is unclear what drives these effects and whether cyclically varying hormonal differences between men and women contribute to differences in economic preferences. We focus here on how economic rationality and preferences change as a function of menstrual cycle phase in women. We tested adherence to the Generalized Axiom of Revealed Preference (GARP), the standard test of economic rationality. If choices satisfy GARP then there exists a well-behaved utility function that the subject's decisions maximize. We also examined whether risk attitudes and loss aversion change as a function of cycle phase. We found that, despite large fluctuations in hormone levels, women are as technically rational in their choice behavior as their male counterparts at all phases of the menstrual cycle. However, women are more likely to choose risky options that can lead to potential losses while ovulating; during ovulation women are less loss averse than men and therefore more economically rational than men in this regard. These findings may have market-level implications: ovulating women more effectively maximize expected value than do other groups. PMID:26824245

  8. Characterization of standard embeddings between complex Grassmannians by means of varieties of minimal rational tangents

    Institute of Scientific and Technical Information of China (English)

    MOK; Ngaiming

    2008-01-01

    In 1993,Tsal proved that a proper holomorphic mapping f:Ω→Ω’ from an irreducible bounded symmetric domainΩof rank≥2 into a bounded symmetric domainΩ’ is necessarily totally geodesic provided that r’:=rank(Ω’)≤rank(Ω):= r,proving a conjecture of the author’s motivated by Hermitian metric rigidity.As a first step in the proof,Tsai showed that df preserves almost everywhere the set of tangent vectors of rank 1.Identifying bounded symmetric domains as open subsets of their compact duals by means of the Borel embedding,this means that the germ of f at a general point preserves the varieties of minimal rational tangents(VMRTs). In another completely different direction Hwang-Mok established with very few exceptions the Cartan- Fubini extension priniciple for germs of local biholomorphisms between Fano manifolds of Picard num- ber 1,showing that the germ of map extends to a global biholomorphism provided that it preserves VMRTs.We propose to isolate the problem of characterization of special holomorphic embeddings between Fano manifolds of Picard number 1,especially in the case of classical manifolds such as ratio- nal homogeneous spaces of Picard number 1,by a non-equidimensional analogue of the Cartan-Fubini extension principle.As an illustration we show along this line that standard embeddings between com- plex Grassmann manifolds of rank≤2 can be characterized by the VMRT-preserving property and a non-degeneracy condition,giving a new proof of a result of Neretin’s which on the one hand paves the way for far-reaching generalizations to the context of rational homogeneous spaces and more generally Fano manifolds of Picard number 1,on the other hand should be applicable to the study of proper holomorphic mappings between bounded domains carrying some form of geometric structures.

  9. RATIONAL CHOICE INSTITUTIONALISM AND THE EUROPEAN NEIGHBOURHOOD POLICY

    Directory of Open Access Journals (Sweden)

    Andreea Maha

    2013-09-01

    Full Text Available The aim of this paper is to highlight the main aspects regarding the rational choice theory in neo-institutionalism, and the role the EU Neighbourhood Policy has nowadays. The protagonist of the rational choice theory in the new institutionalism remains homo-economicus. The theory of rational choice institutionalism challenges the perfect rationality of the individual, rather than the principle of rational choice itself. ENP is a framework for consolidating the Union's relations with neighbouring countries and aims therefore intensifying cooperation with them in order to establish a zone of prosperity, good neighbourliness, stability and security.

  10. Physics with loosely bound nuclei

    Indian Academy of Sciences (India)

    Chhanda Samanta

    2001-08-01

    The essential aspect of contemporary physics is to understand properties of nucleonic matter that constitutes the world around us. Over the years research in nuclear physics has provided strong guidance in understanding the basic principles of nuclear interactions. But, the scenario of nuclear physics changed drastically as the new generation of accelerators started providing more and more rare isotopes, which are away from the line of stability. These weakly bound nuclei are found to exhibit new forms of nuclear matter and unprecedented exotic behaviour. The low breakup thresholds of these rare nuclei are posing new challenges to both theory and experiments. Fortunately, nature has provided a few loosely bound stable nuclei that have been studied thoroughly for decades. Attempts are being made to find a consistent picture for the unstable nuclei starting from their stable counterparts. Some significant differences in the structure and reaction mechanisms are found.

  11. Concentration Bounds for Stochastic Approximations

    CERN Document Server

    Frikha, Noufel

    2012-01-01

    We obtain non asymptotic concentration bounds for two kinds of stochastic approximations. We first consider the deviations between the expectation of a given function of the Euler scheme of some diffusion process at a fixed deterministic time and its empirical mean obtained by the Monte-Carlo procedure. We then give some estimates concerning the deviation between the value at a given time-step of a stochastic approximation algorithm and its target. Under suitable assumptions both concentration bounds turn out to be Gaussian. The key tool consists in exploiting accurately the concentration properties of the increments of the schemes. For the first case, as opposed to the previous work of Lemaire and Menozzi (EJP, 2010), we do not have any systematic bias in our estimates. Also, no specific non-degeneracy conditions are assumed.

  12. Bound anionic states of adenine

    OpenAIRE

    Harańczyk, Maciej; Gutowski, Maciej; Li, Xiang; Bowen, Kit H.

    2007-01-01

    Anionic states of nucleic acid bases are involved in DNA damage by low-energy electrons and in charge transfer through DNA. Previous gas phase studies of free, unsolvated nucleic acid base parent anions probed only dipole-bound states, which are not present in condensed phase environments, but did not observe valence anionic states, which for purine bases are thought to be adiabatically unbound. Contrary to this expectation, we have demonstrated that some thus far ignored tautomers of adenine...

  13. The bound mu+ mu- system

    OpenAIRE

    Jentschura, U.; Soff, G.; Ivanov, V.; Karshenboim, S.

    1997-01-01

    We consider the hyperfine structure, the atomic spectrum and the decay channels of the bound mu+ mu- system (dimuonium). The annihilation lifetimes of low-lying atomic states of the system lie in the nanosecond range range. The decay rates could be measured by detection of the decay products (high energy photons or electron-positron pairs). The hyperfine structure splitting of the dimuonic system and its decay rate are influenced by electronic vacuum polarization effects in the far time-like ...

  14. A REMARK ON IMPLICITIZING RATIONAL CURVES WITH BASE POINTS

    Institute of Scientific and Technical Information of China (English)

    CHENFALAI

    1998-01-01

    A simple relationship between the Bezout matrix corresponding to a rational curve with base points and the Bezout matrix corresponding to the same rational curve except that whose base points are eliminated is clarified. Based on this relationship,the author proves that the implicit equation of a rational curve with base points is the largest rton-zero leading principal minor of the gezout resultant corresponding to the rational curve assuming that the rational curve doesn't have triva/base point 0,and thus provides a simple approach to Jmplicitze rational curves with base points. Furthermore,as a by-product ,art algorithm is presented to compute the base points of a rational curve.

  15. 78 FR 18326 - Agency Information Collection Activities; Comment Request; Upward Bound and Upward Bound Math...

    Science.gov (United States)

    2013-03-26

    ... Agency Information Collection Activities; Comment Request; Upward Bound and Upward Bound Math Science... Upward Bound Math Science Annual Performance Report. OMB Control Number: 1840-NEW. Type of Review: New... under the regular Upward Bound (UB) and Upward Bound Math and Science (UBMS) Programs. The Department...

  16. The Cost of Bounded Curvature

    CERN Document Server

    Kim, Hyo-Sil

    2011-01-01

    We study the motion-planning problem for a car-like robot whose turning radius is bounded from below by one and which is allowed to move in the forward direction only (Dubins car). For two robot configurations $\\sigma, \\sigma'$, let $\\ell(\\sigma, \\sigma')$ be the shortest bounded-curvature path from $\\sigma$ to $\\sigma'$. For $d \\geq 0$, let $\\ell(d)$ be the supremum of $\\ell(\\sigma, \\sigma')$, over all pairs $(\\sigma, \\sigma')$ that are at Euclidean distance $d$. We study the function $\\dub(d) = \\ell(d) - d$, which expresses the difference between the bounded-curvature path length and the Euclidean distance of its endpoints. We show that $\\dub(d)$ decreases monotonically from $\\dub(0) = 7\\pi/3$ to $\\dub(\\ds) = 2\\pi$, and is constant for $d \\geq \\ds$. Here $\\ds \\approx 1.5874$. We describe pairs of configurations that exhibit the worst-case of $\\dub(d)$ for every distance $d$.

  17. [The impact of ethical and moral competence in decision making on rationalism and rationing nursing interventions].

    Science.gov (United States)

    Schwerdt, R

    2005-08-01

    The intraprofessional discourse about economical aspects in nursing from an ethical point of view has not taken place yet. To cope with the increasing restriction of resources, some preconditions have to be met: It is necessary to communicate issues in rationalizing and rationing in nursing openly. Person-oriented criteria in the nursing process indicate a high level of competence and user-oriented quality in nursing care. But nursing professionals do not decide in favor or against resources to perform this task on a high or poor quality level. Democratic decision-making on providing nursing services depends on a continuous societal discourse about allocation criteria. PMID:16133753

  18. Strategy of Rational Use of Energy

    International Nuclear Information System (INIS)

    In the decade of the eighty, especially in order to this decade and so far, the Rational Use of Energy have not constituted a high-priority option and of present time for Colombia. The last politicians were guided, to favor the energy consumption with low prices of the coal, of the electricity, of those derived of the petroleum, growing subsidy to the gasoline and transfer of the productive sector toward the social one. In the recovery of the electric sector, it is contributed alternatives to improve the quality of the service of the electric industries where measured technical and investments in the industrial, commercial sectors and public would allow to reduce short term the consumptions for 5 to 10%, without reducing the production levels or of service. In the construction sector , the efficient designs of buildings could avoid a growth too much express of the energy consumption. The rational use of energy and the handling of the electric demand, should be one of the tools bigger than the State and of the electric industry, as the technical measures of reduction of losses, to respond to the financial crisis of the energy public sector, while the private sector acquires capacity of enough investment. The Colombians companies, experience the necessity to improve their energy efficiency, like one of the important areas of reduction of their costs and of increase of their competitiveness, in front of other countries, especially Latin-American. As consequence of the economic opening, the companies should modernize their processes and administration methods, what means a reduction in the energy consumptions. The reduction of the polluting, specially atmospheric emissions (industries, vehicles), as well as to elimination of having undone dangerous and industrial residuals, it is a priority in Colombia all improvement of the energy efficiency, particularly in the industries, it is accompanied of a proportional reduction of polluting emissions. Then a politics of

  19. Evaluation of radioactivity in ration items

    International Nuclear Information System (INIS)

    The aim of this study was to analyze and evaluate the radioactivity of various ration samples, such as (milk, tea, flour,lentil, food oil, food glee, beans, rice, and sugar) which had been imported by Ministry of Trade ,from January 2008 till December 2010. Gamma Spectroscopy analyzing System were used for measuring and analyzing of these samples, the system consist of high purity Germanium detector with efficiency 40%, resolution 2 keV at 1.332 MeV (60Co), Dsa 2000 system which protective barrier made in Canberra Company, the developed Genie 2000 program and using personal computer. The calibration of measuring system with standard source of multi energies was used. The mainliner geometrical shape beaker was used during these measured samples which were selected from the ration items. The result showed the existence of natural(40k) concentration vales which were between (45.6b q/kg and 463 Bq/Kg) and also industrial 137Cs concentrations were found in milk and tea samples between (0,94 Bq/Kg and 14.6 Bq/Kg), the result also showed the existence of traces of isotopes belong to the Sara's 238U, and 232Th in the tea samples. The concentration of 214Bi and 212Pb were 4.9 Bq/Kg and 2.35 Bq/Kg respectively. These low -level concentrations yield an annual radioactive dose rate of (7x10-5 mSv/y), we conclude that these radioactive isotopes concentration in food stuff and ration samples were within the acceptable limits which are internationally recommended and are recently published by IAEA safety reports . We consider these level of concentration were due to the influence of Cs. (Author)

  20. Are investors rational, irrational or normal?

    Directory of Open Access Journals (Sweden)

    Md Al Mamun

    2015-08-01

    Full Text Available The nature of investor’s rationality vs. irrationality debate drawn attention of thousands of academic papers, hundreds of conferences, roundtables discussion leading to two ends: the classical theorist i.e. the proponents of efficient market hypothesis (EMH and the behaviorist. From Fisher’s (1906 Nature of Capital & Income to Ross (1977; investor’s rationality has been considered as the principal assumption in the development of theoretical finance. Unfortunately though, various studies have shown repeated form of investor’s irrationality and incompetence in their decision process. Even the very proponents of EMH, Fama (1965 has later on in 1993 advocated the lack of market efficiency! Indeed the story of black Monday in the USA to the global financial tsunami (2007-2012 has put the proponents of EMH into the cluelessness. While, the behaviorists argument that the financial markets can be best understood by studying the psychology is also subject to criticism that there will be no existence of standard models to study agent’s behavior in the market! Therefore, this study aims at finding out the true scenarios of investor’s behavior by working on 200 individual investors in Dhaka Stock Exchange (DSE. Investors’ response to different questions relating to fundamental assumption of “rationality’ or ‘presence of irrationality." The result shows a complete absence of the assumption of rationality or irrationality in number of critical issues. Therefore, the idea of EMH or mere psychologically driven behavioral finance should become less acknowledgeable in understanding the agents of financial market i.e. the investors. Rather a combination of these two may give more insight in understanding the investor’s behavior in the financial market.

  1. Craniofacial reconstruction using rational cubic ball curves.

    Directory of Open Access Journals (Sweden)

    Abdul Majeed

    Full Text Available This paper proposes the reconstruction of craniofacial fracture using rational cubic Ball curve. The idea of choosing Ball curve is based on its robustness of computing efficiency over Bezier curve. The main steps are conversion of Digital Imaging and Communications in Medicine (Dicom images to binary images, boundary extraction and corner point detection, Ball curve fitting with genetic algorithm and final solution conversion to Dicom format. The last section illustrates a real case of craniofacial reconstruction using the proposed method which clearly indicates the applicability of this method. A Graphical User Interface (GUI has also been developed for practical application.

  2. Rational integrability of a nonlinear finance system

    International Nuclear Information System (INIS)

    Highlights: ► The model is parametric and we study its rational integrability for each value of the parameters. ► The model studies the time variation of the interest rate, the investment demand and the price index. ► We contribute to the understanding of the topological structure of the dynamics of the model. - Abstract: In this work we study the complexity of the dynamical financial model recently reported in the literature x.=z+(y-a)x,y.=1-by-x2,z.=-x-cz, by studying its integrability. In particular, we prove that it is not Darbouxian integrable for any value of a, b, c.

  3. Orthorhombic rational approximants for decagonal quasicrystals

    Indian Academy of Sciences (India)

    S Ranganathan; Anandh Subramaniam

    2003-10-01

    An important exercise in the study of rational approximants is to derive their metric, especially in relation to the corresponding quasicrystal or the underlying clusters. Kuo’s model has been the widely accepted model to calculate the metric of the decagonal approximants. Using an alternate model, the metric of the approximants and other complex structures with the icosahedral cluster are explained elsewhere. In this work a comparison is made between the two models bringing out their equivalence. Further, using the concept of average lattices, a modified model is proposed.

  4. Lattice cohomology and rational cuspidal curves

    OpenAIRE

    Bodnár, József; Némethi, András

    2014-01-01

    We show a counterexample to a conjecture of de Bobadilla, Luengo, Melle-Hern\\'{a}ndez and N\\'{e}methi on rational cuspidal projective plane curves. The counterexample is a tricuspidal curve of degree 8. On the other hand, we show that if the number of cusps is at most 2, then the original conjecture can be deduced from the recent results of Borodzik and Livingston and (lattice cohomology) computations of N\\'emethi and Rom\\'an. Then we formulate a `simplified' (slightly weaker) version, more i...

  5. Feeling food: The rationality of perception

    OpenAIRE

    Beekman, V.

    2004-01-01

    Regulatory bodies tend to treat people¿s emotional responses towards foods as a nuisance for rational opinion-formation and decision-making. This position is thought to be supported by such evidence as: (1) people showing negative emotional responses to the idea of eating meat products from vaccinated livestock; and (2) people showing positive emotional responses to Magnum¿s ¿7 sins¿ marketing campaign. Such cases are thought to support the idea that regulatory communication about foods shoul...

  6. Residuation of tropical series: rationality issues

    Czech Academy of Sciences Publication Activity Database

    Badouel, E.; Bouillard, A.; Darondeau, P.; Komenda, Jan

    New York: IEEE, 2011 - (Chong, E.; Polycarpou, M.), s. 3855-3861 ISBN 978-1-4673-0457-3. [50th IEEE Conference on Decision and Control and European Control Conference. Orlando (US), 12.12.2011-15.12.2011] R&D Projects: GA ČR GAP103/11/0517 Grant ostatní: European Commission(XE) EU. ICT .DISC 224498 Institutional research plan: CEZ:AV0Z10190503 Keywords : (max,+) formal power series * residuation * rationality * decidability Subject RIV: BA - General Mathematics http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6160228

  7. The latent rationality of risky decisions

    International Nuclear Information System (INIS)

    The general question of rationality has changed from the old-fashioned difference of means and ends to the modern difference of system and environment. Organizations as social systems producing and reproducing decisions translate this difference into the difference of stability and variety. The question then is: In which way can the difference between stability and variety express rationality? - In the temporal dimension of risk-taking, re-entries may be expressed as 'present futures' or 'future presences'. These expressions indicate both: The irresolvable uncertainty of any risk-taking, indicated by open futures, and its boundedness by self-application of distinctions, e.g. projected futures from the background of a known past. - In the material dimension of risk-taking, re-entries may be expressed as 'stable flexibility' or 'flexible stability'. Again, these expressions indicate both: The irresolvable uncertainty of any risk-taking, indicted by open flexibilities, and its boundedness by self-application of distinctions, e.g. flexibility and stability after learning the respective costs of the single options. In the social dimension of risk-taking, re-entries may be expressed as 'pragmatic dissent' or 'controversial pragmatism'. Again, these expressions indicate both: The irresolvable uncertainty of any risk-taking, indicated by open dissent or controversies, and its boundedness by self-application of distinctions, e.g. pragmatic agreements and irresolvable dissent. Again, all three asymmetries represent re-entries. The built-in preferences simply do not work without the subtleties of re-entries, at least when these processes are described by sociologically informed observers. Who else should know that he or she is operating on the basis of something called re-entries? In everyday life communication, no one sees a thing like that since every observation has an in-built bias for one side of a distinction. So rationality will stay latent as the operation of re

  8. The latent rationality of risky decisions

    Energy Technology Data Exchange (ETDEWEB)

    Japp, K.P. [Bielefeld Univ. (Germany). Faculty for Sociology

    1999-12-01

    The general question of rationality has changed from the old-fashioned difference of means and ends to the modern difference of system and environment. Organizations as social systems producing and reproducing decisions translate this difference into the difference of stability and variety. The question then is: In which way can the difference between stability and variety express rationality? - In the temporal dimension of risk-taking, re-entries may be expressed as 'present futures' or 'future presences'. These expressions indicate both: The irresolvable uncertainty of any risk-taking, indicated by open futures, and its boundedness by self-application of distinctions, e.g. projected futures from the background of a known past. - In the material dimension of risk-taking, re-entries may be expressed as 'stable flexibility' or 'flexible stability'. Again, these expressions indicate both: The irresolvable uncertainty of any risk-taking, indicted by open flexibilities, and its boundedness by self-application of distinctions, e.g. flexibility and stability after learning the respective costs of the single options. In the social dimension of risk-taking, re-entries may be expressed as 'pragmatic dissent' or 'controversial pragmatism'. Again, these expressions indicate both: The irresolvable uncertainty of any risk-taking, indicated by open dissent or controversies, and its boundedness by self-application of distinctions, e.g. pragmatic agreements and irresolvable dissent. Again, all three asymmetries represent re-entries. The built-in preferences simply do not work without the subtleties of re-entries, at least when these processes are described by sociologically informed observers. Who else should know that he or she is operating on the basis of something called re-entries? In everyday life communication, no one sees a thing like that since every observation has an in-built bias for one side of a distinction

  9. Rational interpretation of the postulates in plasticity

    Directory of Open Access Journals (Sweden)

    Bohua Sun

    2014-01-01

    Full Text Available This article is mainly focussed on revisited of the two well-known postulates of plasticity, i.e., the Drucker and the Il’iushin postulate, and it describes their rational interpretation within the framework of irreversible thermodynamics and using exterior calculus. It shows that the Il’iushin and the Drucker postulate is the integral form and local form of the irreversible thermodynamics of plastic deformation, respectively. The Drucker and Il’iushin postulate is equivalent for both soft and hardening materials.

  10. Asymptotic representations and Drinfeld rational fractions

    OpenAIRE

    Hernandez, David; Jimbo, Michio

    2011-01-01

    We introduce and study a category of representations of the Borel algebra, associated with a quantum loop algebra of non-twisted type. We construct fundamental representations for this category as a limit of the Kirillov-Reshetikhin modules over the quantum loop algebra and we establish explicit formulas for their characters. We prove that general simple modules in this category are classified by n-tuples of rational functions in one variable, which are regular and non-zero at the origin but ...

  11. Extension of a Spectral Bounding Method to Complex Rotated Hamiltonians, with Application to $p^2-ix^3$

    OpenAIRE

    Handy, C. R.; Wang, Xiao Qian

    2001-01-01

    We show that a recently developed method for generating bounds for the discrete energy states of the non-hermitian $-ix^3$ potential (Handy 2001) is applicable to complex rotated versions of the Hamiltonian. This has important implications for extension of the method in the analysis of resonant states, Regge poles, and general bound states in the complex plane (Bender and Boettcher (1998)).

  12. Causal Entropy Bound for a Spacelike Region

    Science.gov (United States)

    Brustein, R.; Veneziano, G.

    2000-06-01

    The identification of a causal-connection scale motivates us to propose a new covariant bound on entropy within a generic spacelike region. This ``causal entropy bound,'' scaling as EV, and thus lying around the geometric mean of Bekenstein's S/ER and holographic S/A bounds, is checked in various ``critical'' situations. In the case of limited gravity, Bekenstein's bound is the strongest while naive holography is the weakest. In the case of strong gravity, our bound and Bousso's holographic bound are stronger than Bekenstein's, while naive holography is too tight, and hence typically wrong.

  13. NMR structure and dynamics of the agonist dynorphin peptide bound to the human kappa opioid receptor

    OpenAIRE

    O’Connor, Casey; White, Kate L.; Doncescu, Nathalie; Didenko, Tatiana; Roth, Bryan L.; Czaplicki, Georges; Stevens, Raymond C.; Wüthrich, Kurt; Milon, Alain

    2015-01-01

    The human kappa opioid receptor (KOR) is implicated in addiction, pain, reward, mood, cognition, and perception. Activation of KOR by the neuropeptide dynorphin is critical in mediating analgesia and tolerance. Our solution NMR study of dynorphin (1–13) provided quantitative data on a KOR-bound conformation. Analysis of the peptide structure and dynamics revealed a central helical turn bounded on both sides by flexibly disordered peptide segments. Future drug development will benefit from kno...

  14. Monetary policy and fiscal stimulus with the zero lower bound and financial frictions

    OpenAIRE

    Merola, Rossana

    2012-01-01

    Recent developments in many industrialized countries have triggered a debate on whether monetary policy is effective when the nominal interest rate is close to zero. When the nominal interest rate hits its lower bound, the monetary authority is no longer in a position to pursue a policy of monetary easing by lowering nominal interest rates further. In this paper, I assess the implications of the zero lower bound in a DSGE model with financial frictions. The analysis shows that in a framework ...

  15. Modelling grain growth in the framework of Rational Extended Thermodynamics

    Science.gov (United States)

    Kertsch, Lukas; Helm, Dirk

    2016-05-01

    Grain growth is a significant phenomenon for the thermomechanical processing of metals. Since the mobility of the grain boundaries is thermally activated and energy stored in the grain boundaries is released during their motion, a mutual interaction with the process conditions occurs. To model such phenomena, a thermodynamic framework for the representation of thermomechanical coupling phenomena in metals including a microstructure description is required. For this purpose, Rational Extended Thermodynamics appears to be a useful tool. We apply an entropy principle to derive a thermodynamically consistent model for grain coarsening due to the growth and shrinkage of individual grains. Despite the rather different approaches applied, we obtain a grain growth model which is similar to existing ones and can be regarded as a thermodynamic extension of that by Hillert (1965) to more general systems. To demonstrate the applicability of the model, we compare our simulation results to grain growth experiments in pure copper by different authors, which we are able to reproduce very accurately. Finally, we study the implications of the energy release due to grain growth on the energy balance. The present unified approach combining a microstructure description and continuum mechanics is ready to be further used to develop more elaborate material models for complex thermo-chemo-mechanical coupling phenomena.

  16. Probabilistic approach to rationalization of plants maintenance

    International Nuclear Information System (INIS)

    Since there are a lot of equipments in large plants, their safety and reliability cannot be kept as high level as designed without maintenance activities. Then preventive maintenance is intensively executed in some large plants. However, it will be inefficient to perform the preventive maintenance blindly. To make maintenance activities effective, it is essential to identify the critical equipments influencing plant safety and/or reliability and carry out the maintenance by focusing attentions on these equipments. It needs quantitative analyses to identify the critical equipments based on the data of failure rates. However, complete data set of failure rates cannot necessarily be available for some plants such as nuclear power plants. In this study, we carry out the reliability analysis for generic LNG plant and calculate various quantitative risk importance measures for each equipment. We propose rather qualitative representations for some quantitative measures, considering the situation without complete data set and conclude that it is possible to rationalize maintenance procedure by using these rather qualitative measures, though the level of rationalization is of course limited. (author)

  17. Patterns in rational base number systems

    CERN Document Server

    Morgenbesser, Johannes F; Thuswaldner, Jörg

    2012-01-01

    Number systems with a rational number $a/b > 1$ as base have gained interest in recent years. In particular, relations to Mahler's 3/2-problem as well as the Josephus problem have been established. In the present paper we show that the patterns of digits in the representations of positive integers in such a number system are uniformly distributed. We study the sum-of-digits function of number systems with rational base $a/b$ and use representations w.r.t. this base to construct normal numbers in base $a$ in the spirit of Champernowne. The main challenge in our proofs comes from the fact that the language of the representations of integers in these number systems is not context-free. The intricacy of this language makes it impossible to prove our results along classical lines. In particular, we use self-affine tiles that are defined in certain subrings of the ad\\'ele ring $\\mathbb{A}_\\mathbb{Q}$ and Fourier analysis in $\\mathbb{A}_\\mathbb{Q}$. With help of these tools we are able to reformulate our results as ...

  18. Rational Choice Theory and Addiction Behaviour

    Directory of Open Access Journals (Sweden)

    Miloš Krstić

    2014-12-01

    Full Text Available The purpose of this paper is to explore the construct of student satisfaction and analyze its relationship with student loyalty in the context of state and private universities. The rational choice theory assumes that, when deciding whether to consume some goods or not, consumers use analysis in order to estimate the values of individual preference indicators. From this point of view, there are risk and time preferences. The former show aversion to a risk and are expressed through the risk aversion coefficient, while the latter measure the degree of preference for present satisfaction in relation to the same satisfaction in the future. The degree of preference for present satisfaction regarding the same satisfaction in the future is expressed by the time preference rate. Smokers with a low time preference rate and high risk aversion coefficient level can be expected to be successful in cessation. The aim of this paper is to study smokers from the perspective of rational choice theory, in order to detect factors influencing their behavior. The study (investigation found that the significant factors for smokers’ behavior are: gender, age, education, risk aversion coefficient, and the time preference rate. Analysis of smokers’ behavior, with appropriate limits and qualifications, is a well-developed and highly effective tool for exploring and interpreting reality.

  19. formulating rations for fast growing lambs

    International Nuclear Information System (INIS)

    two main experiments have been conducted to evaluate the nutritive efficiency of dried sugar beet pulp(DSBP)as energy source replacement of corn in sheep ration during suckling and growing periods.the results could be summarized as the following: 1-in the present study, further dietary vitamin-d supplementation to DSBP based diet at a rate of 1 kg per ton was the proper preventive treatment of Ca-deficiency associated with DSBP feeding rather than increasing dietary ca-supplies.2- the average daily milk yield tended to increase with groups 100% and 50% DSBP compared to group control diet. the average daily yield was 448, 495 and 521 g for ewes given control, 50% DSBP and 100% diets, respectively. 3- the average daily gain during suckling stage was 222.8, 240.9 and 229.1 g/h/d in male lambs were fed the control, 50% DSBP and 100% DSBP diets, respectively. whereas those of female lambs were 215.6,223.4 and 200.9 g/h/d with control, 50% DSBP and 100% DSBP rations, respectively

  20. WHO and rational reduction of patient dose

    International Nuclear Information System (INIS)

    WHO activities aimed at reducing patient dose, while maintaining satisfactory image quality, include rational use of diagnostic imaging, effective choices for examination, equipment design and specification, quality assurance, and guidance for regulatory authorities and radiological personnel. To assist its Member States in developing a rational policy concerning imaging services WHO provides guidance through publications, its network of Collaborating Centres, and its expert advisers. Because approximately 2/3 of the world's population lacked diagnostic imaging services, early in the 1960s WHO became concerned with basic radiology. After several unsuccessful approaches WHO concentrated on development of the Basic Radiological System (WHO-BRS). Following a workshop held in Neuherberg, Germany, a guide for Quality Assurance in Diagnostic Radiology was published by WHO in 1982. A similar guide for Quality Assurance in Nuclear Medicine was also published in 1982. In collaboration with other international organisations WHO is preparing revised editions of both the Basic Safety Standards for Radiation Protection, and the five-volume Manual on Radiation Protection in Hospitals and General Practice. Regarding future needs, within any health care system there is a spectrum of imaging requirements ranging from the most essential to the most complex. Issues to be resolved involve the clinical decision-making process through which diagnostic imaging examinations are produced and the optimum mixture of imaging modalities. (Author)

  1. Rational Combinations of Targeted Agents in AML

    Directory of Open Access Journals (Sweden)

    Prithviraj Bose

    2015-04-01

    Full Text Available Despite modest improvements in survival over the last several decades, the treatment of AML continues to present a formidable challenge. Most patients are elderly, and these individuals, as well as those with secondary, therapy-related, or relapsed/refractory AML, are particularly difficult to treat, owing to both aggressive disease biology and the high toxicity of current chemotherapeutic regimens. It has become increasingly apparent in recent years that coordinated interruption of cooperative survival signaling pathways in malignant cells is necessary for optimal therapeutic results. The modest efficacy of monotherapy with both cytotoxic and targeted agents in AML testifies to this. As the complex biology of AML continues to be elucidated, many “synthetic lethal” strategies involving rational combinations of targeted agents have been developed. Unfortunately, relatively few of these have been tested clinically, although there is growing interest in this area. In this article, the preclinical and, where available, clinical data on some of the most promising rational combinations of targeted agents in AML are summarized. While new molecules should continue to be combined with conventional genotoxic drugs of proven efficacy, there is perhaps a need to rethink traditional philosophies of clinical trial development and regulatory approval with a focus on mechanism-based, synergistic strategies.

  2. Decision rules and group rationality: cognitive gain or standstill?

    Directory of Open Access Journals (Sweden)

    Petru Lucian Curşeu

    Full Text Available Recent research in group cognition points towards the existence of collective cognitive competencies that transcend individual group members' cognitive competencies. Since rationality is a key cognitive competence for group decision making, and group cognition emerges from the coordination of individual cognition during social interactions, this study tests the extent to which collaborative and consultative decision rules impact the emergence of group rationality. Using a set of decision tasks adapted from the heuristics and biases literature, we evaluate rationality as the extent to which individual choices are aligned with a normative ideal. We further operationalize group rationality as cognitive synergy (the extent to which collective rationality exceeds average or best individual rationality in the group, and we test the effect of collaborative and consultative decision rules in a sample of 176 groups. Our results show that the collaborative decision rule has superior synergic effects as compared to the consultative decision rule. The ninety one groups working in a collaborative fashion made more rational choices (above and beyond the average rationality of their members than the eighty five groups working in a consultative fashion. Moreover, the groups using a collaborative decision rule were closer to the rationality of their best member than groups using consultative decision rules. Nevertheless, on average groups did not outperformed their best member. Therefore, our results reveal how decision rules prescribing interpersonal interactions impact on the emergence of collective cognitive competencies. They also open potential venues for further research on the emergence of collective rationality in human decision-making groups.

  3. Monotonicity of the quantum linear programming bound

    OpenAIRE

    Eric M. Rains

    1998-01-01

    The most powerful technique known at present for bounding the size of quantum codes of prescribed minimum distance is the quantum linear programming bound. Unlike the classical linear programming bound, it is not immediately obvious that if the quantum linear programming constraints are satisfiable for dimension K, that the constraints can be satisfied for all lower dimensions. We show that the quantum linear programming bound is indeed monotonic in this sense, and give an explicitly monotoni...

  4. Bound entangled states with a private key and their classical counterpart.

    Science.gov (United States)

    Ozols, Maris; Smith, Graeme; Smolin, John A

    2014-03-21

    Entanglement is a fundamental resource for quantum information processing. In its pure form, it allows quantum teleportation and sharing classical secrets. Realistic quantum states are noisy and their usefulness is only partially understood. Bound-entangled states are central to this question--they have no distillable entanglement, yet sometimes still have a private classical key. We present a construction of bound-entangled states with a private key based on classical probability distributions. From this emerge states possessing a new classical analogue of bound entanglement, distinct from the long-sought bound information. We also find states of smaller dimensions and higher key rates than previously known. Our construction has implications for classical cryptography: we show that existing protocols are insufficient for extracting private key from our distributions due to their "bound-entangled" nature. We propose a simple extension of existing protocols that can extract a key from them. PMID:24702340

  5. Naturalized Rationality. A Glance At Bolzano's Philosophy Of Mind

    Directory of Open Access Journals (Sweden)

    Anita Konzelmann-Ziv

    2009-10-01

    Full Text Available Bernard Bolzano's philosophy of mind is closely related to his metaphysical conceptions of substance, adherence and force. Questions as to how the mind is working are treated in terms of efficient (causal faculties producing simple and complex representations, conclusive and non-conclusive judgments, and meta-representational attitudes such as believing and knowing. My paper outlines the proximity of Bolzano's account of "mental forces" to contemporary accounts of faculty psychology such as Modularity Theory and Simple Heuristics. While the modularist notions of domain specificity and encapsulated mental faculties align with Bolzano's allotment of domain specific tasks to correspondingly specified psychological forces (e.g. judging to "judgmental force", inferring to "inferential force" etc., the emphasis of Simple Heuristics on accurate "fast and frugal" processes aligns with Bolzano's views regarding cognitive resources and the importance of epistemic economy. The paper attempts to show how Bolzano's metaphysics of mind supposes a conception of bound rationality that determines his epistemology. Combining the rationalist concern for epistemic agent responsibility in the pursuit of knowledge with a strong confidence in the reliability of causal processes to generate the right beliefs, his epistemology shows close affinities with contemporary Virtue Epistemology. According to Virtue Epistemology, knowledge requires that true beliefs be generated by reliable processes typical of a virtuous character. The thesis that Bolzano anticipates virtue epistemological considerations is corroborated by his discussion of heuristic principles that set the norms for the acquisition of knowledge. The paper explores possible relations between such principles and the presumed low-level heuristics of cognitive processes.

  6. Bound entangled states invariant under Ux

    Institute of Scientific and Technical Information of China (English)

    Wang Zhen; Wang Zhi-Xi

    2008-01-01

    This paper obtains an entangled condition for isotropic-like states by using an atomic map. It constructs a class of bound entangled states from the entangled condition and shows that the partial transposition of the state from the constructed bound entangled class is an edge bound entangled state by using range criterion.

  7. Upper Bounds on Numerical Approximation Errors

    DEFF Research Database (Denmark)

    Raahauge, Peter

    2004-01-01

    This paper suggests a method for determining rigorous upper bounds on approximationerrors of numerical solutions to infinite horizon dynamic programming models.Bounds are provided for approximations of the value function and the policyfunction as well as the derivatives of the value function. The...... approximations of a standard (strictly concave)growth model.KEYWORDS: Numerical approximation errors, Bellman contractions, Error bounds...

  8. Atoms as Qed bound atoms

    International Nuclear Information System (INIS)

    The relevance of Quantum Electrodynamics (Qed) in contemporary atomic structure theory is reviewed. Recent experimental advances allow both the production of heavy ions of high charge as well as the measurement of atomic properties with a precision never achieved before. The description of heavy atoms with few electrons via the successive incorporation of one, two, etcetera photons in a rigorous manner and within the bound state Furry representation of Qed is technically feasible. For many-electron atoms the many-body (correlation) effects are very important and it is practically impossible to evaluate all the relevant Feynman diagrams to the required accuracy. Thus, it is necessary to develop a theoretical scheme in which the radiative and nonradiative effects are taken into account in an effective way making emphasis in electronic correlation. Preserving gauge invariance, and avoiding both continuum dissolution and variational collapse are basic problems that must be solved when using effective potential methods and finite-basis representations of them. In this context, we shall discuss advances and problems in the description of atoms as Qed bound states. (Author)

  9. Milnor open books of links of some rational surface singularities

    OpenAIRE

    Özbağcı, Burak; Bhupal, Mohan

    2011-01-01

    Pacific Journal of Mathematics MILNOR OPEN BOOKS OF LINKS OF SOME RATIONAL SURFACE SINGULARITIES MOHAN BHUPAL AND BURAK OZBAGCI Volume 254 No. 1 November 2011 PACIFIC JOURNAL OF MATHEMATICS Vol. 254, No. 1, 2011 MILNOR OPEN BOOKS OF LINKS OF SOME RATIONAL SURFACE SINGULARITIES MOHAN BHUPAL AND BURAK OZBAGCI We determine Legendrian surgery diagrams for the canonical contact struc-tures of links of rational surface singularities that are also small Seifert...

  10. Fast and frugal heuristics : tools of social rationality

    OpenAIRE

    Hertwig, R.; Herzog, S. M.

    2009-01-01

    Homo economicus cannot help but be puzzled by people's baffling array of social behaviors that conflict with economic theory. To accommodate these “deviant” behaviors within the standard view of rationality, defined in terms of probability theory, logic and rational choice theory, economists and psychologists tend to inject some psychology into the rational choice framework. In contrast, we propose to start afresh: We put forth the thesis that humans' social intelligence is not qualitatively ...

  11. The role of credit rationing and collateral in debt financing

    OpenAIRE

    Houben, Eike; Nippel, Peter

    2001-01-01

    Credit rationing and the use of collateral are widely observed in debt financing. To our view there is yet no appropriate theoretical explanation for these facts. In the standard debt financing models the occurrence of credit rationing can be explained based on suitable assumptions. But those are by no means general. Furthermore, the use and the form of collateral is limited. In our model we show that credit rationing and the use of collateral are always necessary for debt financing if lender...

  12. Lending Relationships and Credit Rationing: The Impact of Securitization

    OpenAIRE

    Carbo Valverde, S.; Degryse, H.A.; Rodriguez-Fernandez, F.

    2011-01-01

    Do lending relationships mitigate credit rationing? Does securitization influence the impact of lending relationships on credit rationing? If so, is its impact differently in normal periods versus crisis periods? This paper combines several unique data sets to address these questions. Employing a disequilibrium model to identify credit rationing, we find that more intense lending relationships, measured through their length and lower number, considerable improve credit supply and reduce the d...

  13. Lending relationships and credit rationing: the impact of securitization

    OpenAIRE

    Carbo Valverde, S.; Degryse, H.A.; Rodriguez-Fernandez, F.

    2011-01-01

    Do lending relationships mitigate credit rationing? Does securitization influence the impact of lending relationships on credit rationing? If so, is its impact differently in normal periods versus crisis periods? This paper combines several unique data sets to address these questions. Employing a disequilibrium model to identify credit rationing, we find that more intense lending relationships, measured through their length and lower number, considerable improve credit supply and reduce the d...

  14. Robert Lucas and the theory of rational expectations

    OpenAIRE

    Nikoloski, Krume

    2015-01-01

    Based on the theory of rational expectations a new school has been created, which is called new classical macroeconomics (in the 80s of XX century). In this paper, the hypothesis of rational expectations in the new classical macroeconomics refers to the contemporary confrontation between the new classical macroeconomics and the new Keynesian economics. Kew words: theory of rational expectations, new classical macroeconomics, new Keynesian economics

  15. Fields of rational constants of cyclic factorizable derivations

    OpenAIRE

    Janusz Zielinski

    2015-01-01

    We describe all rational constants of a large family of four-variable cyclic factorizable derivations. Thus, we determine all rational first integrals of their corresponding systems of differential equations. Moreover, we give a characteristic of all four-variable Lotka-Volterra derivations with a nontrivial rational constant. All considerations are over an arbitrary field of characteristic zero. Our main tool is the investigation of the cofactors of strict Darboux ...

  16. New Rational Form Solutions to mKdV Equation

    Institute of Scientific and Technical Information of China (English)

    FU Zun-Tao; LIU Shi-Kuo; LIU Shi-Da

    2005-01-01

    In this paper, new basic functions, which are composed of three basic Jacobi elliptic functions, are chosen as components of finite expansion. This finite expansion can be taken as an ansatz and applied to solve nonlinear wave equations. As an example, mKdV equation is solved, and more new rational form solutions are derived, such as periodic solutions of rational form, solitary wave solutions of rational form, and so on.

  17. Time series prediction using a rational fraction neural networks

    Energy Technology Data Exchange (ETDEWEB)

    Lee, K.; Lee, Y.C.; Barnes, C.; Aldrich, C.H.; Kindel, J.

    1988-01-01

    An efficient neural network based on a rational fraction representation has been trained to perform time series prediction. The network is a generalization of the Volterra-Wiener network while still retaining the computational efficiency of the latter. Because of the second order convergent nature of the learning algorithm, the rational net is computationally far more efficient than multilayer networks. The rational fractional representation is, however, more restrictive than the multilayer networks.

  18. Scientific production in medical rationalities and health practices

    OpenAIRE

    Nascimento, Marilene Cabral do; Nogueira, Maria Inês; Madel Therezinha LUZ

    2012-01-01

    With a history of two decades, the analysis category Medical Rationality holds today a signifi¬cant scientific output in the field of Public Health, with epistemological and socio-historical approaches. This paper is an analytic report that production. Based on a critical review of the literature, we present the category Medical Rationality and the context of its formulation, a quantitative description of the studies produced by the research group “Health Rationalities: Medical Complex System...

  19. Exceptional Sequences of Invertible Sheaves on Rational Surfaces

    OpenAIRE

    Hille, Lutz; Perling, Markus

    2008-01-01

    In this article we consider exceptional sequences of invertible sheaves on smooth complete rational surfaces. We show that to every such sequence one can associate a smooth complete toric surface in a canonical way. We use this structural result to prove various theorems on exceptional and strongly exceptional sequences of invertible sheaves on rational surfaces. We construct full strongly exceptional sequences for a large class of rational surfaces. For the case of toric surfaces we give a c...

  20. THE ROLE OF P-GLYCOPROTEIN IN RATIONAL PHARMACOTHERAPY IN CARDIOLOGY

    Directory of Open Access Journals (Sweden)

    A. V. Shulkin

    2015-09-01

    Full Text Available On the basis of the analysis of published data the role of P-glycoprotein, carrier protein, in rational pharmacotherapy in cardiology was shown on the example of its substrates – digoxin, antiplatelet agents and anticoagulants. Determination of C3435T polymorphism of multidrug resistance gene (MDR1, encoding P-glycoprotein, in pharmacotherapy with digoxin, antiplatelet drugs (clopidogrel tikagrelol, prasugrel and anticoagulants (dabigatran etexilate, rivaroxaban, edoxaban is not feasible in routine practice. Drug in- teractions have clinical implications for the efficacy and safety of pharmacotherapy in coadministration of these drugs with P-glycoprotein substrates, inducers and inhibitors.

  1. Integral cohomology of rational projection method patterns

    CERN Document Server

    Gaehler, Franz; Kellendonk, Johannes

    2012-01-01

    We study the cohomology and hence K-theory of the aperiodic tilings formed by the so called `cut and project' method, i.e., patterns in d dimensional Euclidean space which arise as sections of higher dimensional, periodic structures. They form one of the key families of patterns used in quasicrystal physics, where their topological invariants carry quantum mechanical information. Our work develops both a theoretical framework and a practical toolkit for the discussion and calculation of their integral cohomology, and extends previous work that only successfully addressed rational cohomological invariants. Our framework unifies the several previous methods used to study the cohomology of these patterns. We obtain explicit calculational results for the main examples of icosahedral patterns in R^3 -- the Danzer tiling, the Ammann-Kramer tiling and the Canonical and Dual Canonical D_6 tilings -- as well as results for many of the better known 2 dimensional examples.

  2. RATIONAL BASIS FOR SUSPENDED SEDIMENT MODELING

    Institute of Scientific and Technical Information of China (English)

    Jianjun ZHOU; Binliang LIN; Bingnan LIN

    2003-01-01

    This paper presents a rational basis to model the transport of suspended sediment. The looseboundary condition for 3D models and the adjustment coefficients for both the depth-integrated 2D and laterally integrated 1D models are treated comprehensively. A combination of Dirichlet and Neumann conditions is proposed as the loose-boundary condition. The adjustment coefficient for 2D models is obtained on the basis of the proposed boundary condition and analytical solutions developed for some simple cases of non-equilibrium transport of sediment in uniform flows. The adjustment coefficient for 1D models for natural rivers is further obtained from lateral integration. Comparisons with analytical solutions and a considerable amount of laboratory and prototype data show that mathematical models developed along the proposed line of attack would well simulate the transport of suspended sediment in practical problems.

  3. On Chaotic Dynamics in Rational Polygonal Billiards

    Directory of Open Access Journals (Sweden)

    Valery Kokshenev

    2005-11-01

    Full Text Available We discuss the interplay between the piece-line regular and vertex-angle singular boundary effects, related to integrability and chaotic features in rational polygonal billiards. The approach to controversial issue of regular and irregular motion in polygons is taken within the alternative deterministic and stochastic frameworks. The analysis is developed in terms of the billiard-wall collision distribution and the particle survival probability, simulated in closed and weakly open polygons, respectively. In the multi-vertex polygons, the late-time wall-collision events result in the circular-like regular periodic trajectories (sliding orbits, which, in the open billiard case are likely transformed into the surviving collective excitations (vortices. Having no topological analogy with the regular orbits in the geometrically corresponding circular billiard, sliding orbits and vortices are well distinguished in the weakly open polygons via the universal and non-universal relaxation dynamics.

  4. Echinocandins for candidemia: a rational choice

    Directory of Open Access Journals (Sweden)

    Francesco Menichetti

    2013-08-01

    Full Text Available Among antifungal drugs, echinocandins (micafungin, caspofungin and anidulafungin represent a rational choice for the first-line therapy of candidemia/invasive candidiasis in critically ill patients. Among other properties characterizing echinocandins, it’s important to emphasize the broad spectrum of activity, the fungicidal activity against the majority of Candida spp., and the activity against the biofilm. Furthermore, echinocandins show greater efficacy than conventional amphotericin B and fluconazole, and similar efficacy to liposomal amphotericin B (but they are less toxic. Finally, echinocandins are recommended at the highest level of evidence (AI for the treatment of invasive candidiasis by IDSA and ESCMID guidelines.http://dx.doi.org/10.7175/rhc.v4i2s.872

  5. A Rational Approach to Cryptographic Protocols

    CERN Document Server

    Caballero-Gil, P; Bruno-Castañeda, C; 10.1016/j.mcm.2006.12.013

    2010-01-01

    This work initiates an analysis of several cryptographic protocols from a rational point of view using a game-theoretical approach, which allows us to represent not only the protocols but also possible misbehaviours of parties. Concretely, several concepts of two-person games and of two-party cryptographic protocols are here combined in order to model the latters as the formers. One of the main advantages of analysing a cryptographic protocol in the game-theory setting is the possibility of describing improved and stronger cryptographic solutions because possible adversarial behaviours may be taken into account directly. With those tools, protocols can be studied in a malicious model in order to find equilibrium conditions that make possible to protect honest parties against all possible strategies of adversaries.

  6. Rational F-theory GUTs without exotics

    International Nuclear Information System (INIS)

    We construct F-theory GUT models without exotic matter, leading to the MSSM matter spectrum with potential singlet extensions. The interplay of engineering explicit geometric setups, absence of four-dimensional anomalies, and realistic phenomenology of the couplings places severe constraints on the allowed local models in a given geometry. In constructions based on the spectral cover we find no model satisfying all these requirements. We then provide a survey of models with additional U(1) symmetries arising from rational sections of the elliptic fibration in toric constructions and obtain phenomenologically appealing models based on SU(5) tops. Furthermore we perform a bottom-up exploration beyond the toric section constructions discussed in the literature so far and identify benchmark models passing all our criteria, which can serve as a guideline for future geometric engineering.

  7. Rational elicitation of cold-sensitive phenotypes.

    Science.gov (United States)

    Baliga, Chetana; Majhi, Sandipan; Mondal, Kajari; Bhattacharjee, Antara; VijayRaghavan, K; Varadarajan, Raghavan

    2016-05-01

    Cold-sensitive phenotypes have helped us understand macromolecular assembly and biological phenomena, yet few attempts have been made to understand the basis of cold sensitivity or to elicit it by design. We report a method for rational design of cold-sensitive phenotypes. The method involves generation of partial loss-of-function mutants, at either buried or functional sites, coupled with selective overexpression strategies. The only essential input is amino acid sequence, although available structural information can be used as well. The method has been used to elicit cold-sensitive mutants of a variety of proteins, both monomeric and dimeric, and in multiple organisms, namely Escherichia coli, Saccharomyces cerevisiae, and Drosophila melanogaster This simple, yet effective technique of inducing cold sensitivity eliminates the need for complex mutations and provides a plausible molecular mechanism for eliciting cold-sensitive phenotypes. PMID:27091994

  8. Fast analytic solver of rational Bethe equations

    CERN Document Server

    Marboe, Christian

    2016-01-01

    In this note we propose an approach for a fast analytic determination of all possible eigenstates of rational GL(N|M) integrable spin chains of given not too large length, in terms of Baxter Q-functions. We observe that all exceptional solutions, if any, are automatically correctly accounted. The key intuition behind the approach is that the equations on the Q-functions are determined solely by the Young diagram, and not by the choice of the rank of the GL symmetry. Hence we can choose arbitrary N and M that accommodate the desired representation. Then we consider all distinguished Q-functions at once, not only those following a certain Kac-Dynkin path.

  9. Rational design of class I MHC ligands

    Science.gov (United States)

    Rognan, D.; Scapozza, L.; Folkers, G.; Daser, Angelika

    1995-04-01

    From the knowledge of the three-dimensional structure of a class I MHC protein, several non natural peptides were designed in order to either optimize the interactions of one secondary anchor amino acid with its HLA binding pocket or to substitute the non interacting part with spacer residues. All peptides were synthesized and tested for binding to the class I MHC protein in an in vitro reconstitution assay. As predicted, the non natural peptides present an enhanced binding to the HLA-B27 molecule with respect to their natural parent peptides. This study constitutes the first step towards the rational design of non peptidic MHC ligands that should be very promising tools for the selective immunotherapy of autoimmune diseases.

  10. Smooth surfaces from rational bilinear patches

    KAUST Repository

    Shi, Ling

    2014-01-01

    Smooth freeform skins from simple panels constitute a challenging topic arising in contemporary architecture. We contribute to this problem area by showing how to approximate a negatively curved surface by smoothly joined rational bilinear patches. The approximation problem is solved with help of a new computational approach to the hyperbolic nets of Huhnen-Venedey and Rörig and optimization algorithms based on it. We also discuss its limits which lie in the topology of the input surface. Finally, freeform deformations based on Darboux transformations are used to generate smooth surfaces from smoothly joined Darboux cyclide patches; in this way we eliminate the restriction to surfaces with negative Gaussian curvature. © 2013 Elsevier B.V.

  11. The Rational View of Product Innovation: A Critical Investigation

    Directory of Open Access Journals (Sweden)

    Hooman Attar

    2012-07-01

    Full Text Available This paper seeks to trace some of the roots and problems of the rational view of innovation. Concentrating primarily upon product innovation, we point out that the eighteenth century notion of social progress in the light of reason has gradually given an enormous impetus to a rational view of product innovation in modern organizations. We summarize several decades of research into management of product innovation from the rational approach, compressing and characterizing the literature by six-key policies, best practices or metaphors. The paper discusses some of the issues and problems concerning the rational approach and finally concludes with proposals for future studies.

  12. Production performance of quails given chromium organic in ration

    Directory of Open Access Journals (Sweden)

    Deden Sudrajat

    2014-12-01

    Full Text Available Egg production of quails depends on quality of ration. Nutrient manipulation by chromiun inclusion in ration is a possible way to improve production. It is known that chromium mineral in form of GTF in blood has a role not only in enhancement of glucose entering cells through improvement of insulin activity but also in metabolism of lipid and synthesis of protein and elimination of heat stress to improve egg production. This study aimed at assessing egg production of quails fed ration containing chromium-yeast. Sixty-four quails aged 40 days were used. A completely randomized design with 4 treatments and 4 replication was applied in this study. Treatment consisted of commercial ration + Cr 0 ppm (R1, commercial ration + Cr 0.5 ppm (R2, commercial ration + Cr 1 ppm (R3, and commercial ration+ Cr 1.5 ppm (R4. Measurements were taken on feed intake, egg weight, egg mass production, hen day, feed conversion rate, egg index, and egg shell thickness. Results showed that A ration containing organic chromium as much as 1,5 ppm did not affect feed intake, egg production, egg weight, and eggshell thickness, however lowered feed conversion rate by up to 32.25% from that of control. Supplementation of 0,5 ppm chromium in the ration lowered the value of eggs index in the fourth week.

  13. Exact linear rational expectations models: specification and estimation

    OpenAIRE

    Lars Peter Hansen; Thomas J. Sargent

    1981-01-01

    This paper describes how to specify and estimate rational expectations models in which there are exact linear relationships among variables and expectations of variables that the econometrician observes.

  14. The rational use of drugs and WHO.

    Science.gov (United States)

    1985-01-01

    On November 25-29, 1985, the World Health Organization held a Conference in Nairobi of Experts on the Rational Use of Drugs. In the early 1980s, both the International Federation of Pharmaceutical Manufacturers Association (IFPMA) and Health Action International (HAI) had developed codes of pharmaceutical marketing practices in order to come to terms with the malpractices in this field. A more comprehensive approach was needed, however. Prime responsibility for rational drug use must rest with the member governments, operating through national regulatory authorities and assisted in their work by guidelines on minimum requirements for national drug regulation prepared by WHO. The Dag Hammarskjold Foundation organized a seminar on Another Development in Pharmaceuticals as an independent contribution to the international debate on this global issue. The seminar emphasized that development should be need-oriented, self-reliant, and based on structural transformations. Governments view the pharmaceutical crisis as 1 facet of the more general problem of spiralling health costs which put an intolerable burden on already overstretched welfare services. The pharmaceutical industry sees the crisis largely in terms of excessively restrictive regulations which stifle innovation of products. Some doctors and pharmacists feel that increased regulatory measures will erode their rights to prescribe and to control the supply and information to patients. On the other hand, some clinical pharmacologists and administrators express concern about excessive, irrational and uneconomic prescribing and its effects on public health. Consumer groups define the problem in terms of an overbearing and greedy business community. The general public fail to understand the effects of pharmaceuticals. PMID:12341043

  15. Bounded generalized Harish-Chandra modules

    OpenAIRE

    Penkov, Ivan; Serganova, Vera

    2007-01-01

    Let $\\gg$ be a complex reductive Lie algebra and $\\kk\\subset\\gg$ be any reductive in $\\gg$ subalgebra. We call a $(\\gg,\\kk)$-module $M$ bounded if the $\\kk$-multiplicities of $M$ are uniformly bounded. In this paper we initiate a general study of simple bounded $(\\gg,\\kk)$-modules. We prove a strong necessary condition for a subalgebra $\\kk$ to be bounded (Corollary \\ref{cor1.6}), i.e. to admit an infinite-dimensional simple bounded $(\\gg,\\kk)$-module, and then establish a sufficient conditio...

  16. Higgs mass bounds from the functional RG

    International Nuclear Information System (INIS)

    We investigate a Top-Yukawa toy model to study Higgs mass bounds in the framework of the functional renormalization group (RG). Starting the calculations with a quartic ultraviolet (UV) potential we get a finite range of values for the Higgs mass in the infrared for a given cutoff. The bounds appear in a natural way as a consequence of the RG flow. The lower mass bound is approached for a vanishing UV quartic coupling. Furthermore, we study the influence of higher-dimensional operators on the lower Higgs mass bound. We find that even seemingly RG irrelevant interactions can take a substantial influence on the lower bound for the Higgs mass.

  17. Capacity Bounds for Parallel Optical Wireless Channels

    KAUST Repository

    Chaaban, Anas

    2016-01-01

    A system consisting of parallel optical wireless channels with a total average intensity constraint is studied. Capacity upper and lower bounds for this system are derived. Under perfect channel-state information at the transmitter (CSIT), the bounds have to be optimized with respect to the power allocation over the parallel channels. The optimization of the lower bound is non-convex, however, the KKT conditions can be used to find a list of possible solutions one of which is optimal. The optimal solution can then be found by an exhaustive search algorithm, which is computationally expensive. To overcome this, we propose low-complexity power allocation algorithms which are nearly optimal. The optimized capacity lower bound nearly coincides with the capacity at high SNR. Without CSIT, our capacity bounds lead to upper and lower bounds on the outage probability. The outage probability bounds meet at high SNR. The system with average and peak intensity constraints is also discussed.

  18. Information bounds for Gaussian copulas

    CERN Document Server

    Hoff, Peter D; Wellner, Jon A

    2011-01-01

    Often of primary interest in the analysis of multivariate data are the copula parameters describing the dependence among the variables, rather than the univariate marginal distributions. Since the ranks of a multivariate dataset are invariant to changes in the univariate marginal distributions, rank-based procedures are natural candidates as semiparametric estimators of copula parameters. Asymptotic information bounds for such estimators can be obtained from an asymptotic analysis of the rank likelihood, i.e. the probability of the multivariate ranks. In this article, we obtain limiting normal distributions of the rank likelihood for Gaussian copula models. Our results cover models with structured correlation matrices, such as exchangeable, autoregressive and circular correlation, as well as unstructured correlation matrices. For all Gaussian copula models, the limiting distribution of the rank likelihood ratio is shown to be equal to that of a parametric likelihood ratio for an appropriately chosen multivari...

  19. Spectral computations for bounded operators

    CERN Document Server

    Ahues, Mario; Limaye, Balmohan

    2001-01-01

    Exact eigenvalues, eigenvectors, and principal vectors of operators with infinite dimensional ranges can rarely be found. Therefore, one must approximate such operators by finite rank operators, then solve the original eigenvalue problem approximately. Serving as both an outstanding text for graduate students and as a source of current results for research scientists, Spectral Computations for Bounded Operators addresses the issue of solving eigenvalue problems for operators on infinite dimensional spaces. From a review of classical spectral theory through concrete approximation techniques to finite dimensional situations that can be implemented on a computer, this volume illustrates the marriage of pure and applied mathematics. It contains a variety of recent developments, including a new type of approximation that encompasses a variety of approximation methods but is simple to verify in practice. It also suggests a new stopping criterion for the QR Method and outlines advances in both the iterative refineme...

  20. Antibaryon-nucleus bound states

    CERN Document Server

    Hrtánková, J

    2014-01-01

    We calculated antibaryon ($\\bar{B}$ = $\\bar{p}$, $\\bar{\\Lambda}$, $\\bar{\\Sigma}$, $\\bar{\\Xi}$) bound states in selected nuclei within the relativistic mean-field (RMF) model. The G-parity motivated $\\bar{B}$-meson coupling constants were scaled to yield corresponding potentials consistent with available experimental data. Large polarization of the nuclear core caused by $\\bar{B}$ was confirmed. The $\\bar{p}$ annihilation in the nuclear medium was incorporated by including a phenomenological imaginary part of the optical potential. The calculations using a complex $\\bar{p}$-nucleus potential were performed fully self-consistently. The $\\bar{p}$ widths significantly decrease when the phase space reduction is considered for $\\bar{p}$ annihilation products, but they still remain sizeable for potentials consistent with $\\bar{p}$-atom data.