The Interplay of Cultural Aversion and Assortativity for the Emergence of Cooperation

This paper investigates the emergence of cooperation in a heterogeneous population. The population is divided into two cultural groups. Agents in the population are randomly matched in pairs to engage in a prisoner dilemma. The matching process is assortative, that is, cooperators are more likely to be matched with cooperators, defectors are more likely to be matched with defectors. When two agents of different cultures are matched, they suffer a cost due to their cultural differences. We call such a cost cultural aversion. We find that when cultural aversion is sufficiently strong, perfect correlation between culture and behavior emerges: all agents from one cultural group cooperate, while all agents from the other cultural group defect

EUROGRAPHICS ’97 / D. Fellner and L. Szirmay-Kalos (Guest Editors) Volume 16,(1997), Number 3 A Rendering Equation for Specular Transfers and Its Integration into Global Illumination

In this paper, we presenta rigoroustheoretical formulation of the fundamental problem—indirectillumination from area sources via curved ideal specular surfaces. Intensity and area factors are introduced to clarify this problem and to rectify the radiance from these specular surfaces. They take surface geometry, such as Gaussian curvature, into account. Based on this formulation, an algorithm for integrating ideal specular transfers into global illumination is also presented. This algorithm can deal with curved specular reflectorsand transmitters. An implementation is described based on wavefront tracing and progressive radiosity. Sample images generated by this method are presented

Stability Analysis of a SEIQR Epidemic Model with Saturated Incidence and Time Delay

Considering the effect of isolation and vaccination on control of disease，a SEIQR epidemic model with saturated incidence and time delay is established. Then，the existence condition of the disease-free equilibrium and endemic equilibrium and the permanence of model are obtained. The global stability of the disease-free equilibrium and endemic equilibrium are proved by constructing an appropriate Liapunov function，numerical simulations are presented to verify the properties of the models dynamics

Stability Analysis of a SEIQR Epidemic Model with Pulse Vaccination

This paper considers the periodic pulse vaccination of susceptible and the isolation control of the infective，a SEIQR epidemic model is established. The sufficient condition for stability of disease-free periodic solution and permanence of disease are obtained by pulse equation theory

Entwicklung eines Verfahrens zur Aufbereitung von Abwasser aus dem Fleischverarbeitungsgewerbe bis zur Guete von hoch reinem Betriebswasser einschliesslich Verwertung der Abwasserschlaemme Abschlussbericht

SIGLEAvailable from TIB Hannover: QN1(121,58) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDeutsche Bundesstiftung Umwelt, Osnabrueck (Germany)DEGerman

Dependence Testing without Induction Variable Substitution

We present a new approach to dependence testing in the presence of induction variables. Instead of looking for closed form expressions, our method computes monotonic evolution which captures the direction in which the value of a variable changes. This information is used for dependence testing of array references. Under this scheme, closed form computation and induction variable substitution can be delayed until after the dependence test and be performed on-demand. The technique can be extended to dynamic data structures, using either pointer-based implementations or standard object-oriented containers. To improve efficiency, we also propose an optimized (non-iterative) data-flow algorithm to compute evolution. Experimental results show that dependence tests based on evolution information match the accuracy of that based on closed-form computation (implemented in Polaris), and when no closed form expressions can be calculated, our method is more accurate than that of Polaris

stroke extraction in cartoon images using edge-enhanced isotropic nonlinear filter

ACM SIGGRAPHThis paper presents an edge-enhanced isotropic nonlinear filter to extract strokes from cartoon images. The algorithm starts by removing most non-stroke regions that have high brightness values using an adaptive threshold. According to the property of dark outline in cartoon images, A Laplacian of Gaussian filter is applied to enhance the isotropic responses of boundary pixels in the stroke. Compared to existing stroke extraction methods, our algorithm can extract strokes in its entirety, and faithfully preserve the details on the stroke boundaries, especially for noisy images. Experimental results show that the proposed algorithm can produce more robust and accurate extraction results on a variety style of cartoon images. Copyright © 2010 by the Association for Computing Machinery, Inc

Wiederaufbereitung von Industrieschmierfetten Abschlussbericht

SIGLEAvailable from TIB Hannover: F02B1004 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDeutsche Bundesstiftung Umwelt, Osnabrueck (Germany)DEGerman