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313_Borgmeyer.pdf (355.8Kb)Borgmeyer, Karin; Quintanilla, Ramón; Racke, Reinhard (2013), Working Paper / Technical Report
Konstanzer Schriften in Mathematik -Nr. 313 [more][less]Zusammenfassung: In two recent papers the authors have studied conditions on the relaxation parameters in order to guarantee the stability or instability of solutions for the Taylor approximations to dual-phase-lag and three-phase-lag heat conduction equations. However, for several limit cases relating to the parameters the kind of stability was unclear. Here we analyze these limit cases and clarify whether we can expect exponential or slow decay for the solutions. Moreover, rather general well-posedness results for three-phase-lag models are presented. Finally, the exponential stability expected by spectral analysis is rigorously proved exemplarily. Dateien zu dieser Publikation: 1
313_Borgmeyer.pdf (355.8Kb) -
graf_212815.pdf (1.235Mb)Graf, Sebastian; Rain, Andreas; Waldvogel, Marcel (2013), Working Paper / Technical Report[more][less]
Zusammenfassung: Being a part of any social network becomes a necessity especially for the sake of self-presentation. Specialized social networks like LinkedIn are aware of these needs and offer tailored functionalities like referencing to relevant projects and topics including specific searching functionalities. Since the social data stored within any centralized social network represents an alluring mass of information, security and privacy concerns come up within their utilization. As a consequence, guidelines for their usage are deployed within institutions to increase awareness related to these concerns. Unfortunately, the specific toolsets deployed within universities for presenting users and projects support neither the sharing of group-based or public information nor the ability to create social connections between users especially not over the borders of single institutions. To combine the need of self-presentation with the ability of virtual social interaction, we present a prototype of a federated, distributed, social network tailored to the need of researchers. Our prototype is based on Diaspora, representing the largest distributed social platform nowadays. Enriched with automated, user-related profiles, our Diaspora-pod offers all members of the University of Konstanz the ability to interact in combination with automated university-profiles. Tightly integrated in the existing infrastructure of the University of Konstanz and hosted on trusted infrastructure, the described prototype offers not only user-defined sharing of personal profiles in a federated way. It also leverages from the centralized handling of profiles and reduces as a consequence the administrative overhead of maintaining any personal information. Based on its simple usage and the tight integration into the services of the University of Konstanz, our prototype has the potential to push university life to a new social level without generating concerns about security and privacy. Dateien zu dieser Publikation: 1
graf_212815.pdf (1.235Mb) -
hertweck_211398.pdf (815.7Kb)Hertweck, Matthias Sebastian; Sigrist, Oliver (2012), Working Paper / Technical Report
Working Paper Series / Department of Economics -Nr. 2012-38 [more][less]Zusammenfassung: This paper quantifies the impact of the Hartz reforms on matching efficiency, using monthly SOEP gross worker flows (1983-2009). We show that, until the early 2000s, close to 60% of changes in the unemployment rate are due to changes in the inflow rate (job separation). On the contrary, since the implementation of the reforms in the mid-2000s, the importance of the outflow rate (job finding) has been steadily increasing. This indicates that matching efficiency has improved substantially in recent years. Results from an estimated matching function - pointing to efficiency gains of more than 20% - corroborate this finding. Dateien zu dieser Publikation: 1
hertweck_211398.pdf (815.7Kb) -
racke_said_295.pdf (289.9Kb)Racke, Reinhard; Said-Hourari, Belkacem (2012), Working Paper / Technical Report
Konstanzer Schriften in Mathematik -Nr. 295 [more][less]Zusammenfassung: Our main focus in the present paper is to study the asymptotic behavior of a nonlinear version of the Timoshenko system in thermoelasticity with second sound. As it has been already proved in \cite{SaidKasi_2011}, the linear version of this system is of regularity-loss type. It is well known (\cite{HKa06}, \cite%b{IK08}, \cite{KK09}) that the regularity-loss property of the linear problem creates difficulties when dealing with the nonlinear problem. In fact, the dissipative property of the problem becomes very weak in the high frequency region and as a result the classical energy method fails. To overcome this difficulty and following \cite{IK08} and \cite{Ikehata_2002}, we use an energy method with negative weights to create an artificial damping which allows us to control the nonlinearity. We prove that for $0\leq k\leq [s/2]-2 $ with $s\geq 8$, the solution of our problem is global in time and decays as $\left\Vert \partial _{x}^{k}U\left( t\right) \right\Vert _{2}\leq C\left( 1+t\right) ^{-1/4-k/2}, $ provided that the initial datum $U_0\in H^s(\mathbb{R})\cap L^1(\mathbb{R}) $. Dateien zu dieser Publikation: 1
racke_said_295.pdf (289.9Kb) -
Doering etal.pdf (403.9Kb)Döring, Sebastian; Schreiner, Melanie; Kupferschmid, Sebastian (2012), Working Paper / Technical Report
Management Brief -Nr. 2012,1 [more][less]Zusammenfassung: This Management Brief addresses the question, which factors lead to successful inter-agency coordination (IAC) in United Nations Peacebuilding Operations. It was written for practitioners and intends to provide concrete recommendations for improving IAC in integrated UN peace endeavors. The results are a product of a research project on the management of peacekeeping and -building operations conducted at the Center of Excellence of the University of Konstanz, Germany. The findings conveyed in this publication are based on data gathered during several field visits of UN operations in Liberia and Haiti and interviews at UN headquarters in New York City and Geneva. Dateien zu dieser Publikation: 1
Doering etal.pdf (403.9Kb) -
Gersbach, Hans; Hahn, Volker (2012), Working Paper / Technical Report
Centre for Economic Policy Research cepr / Discussion paper series -Nr. 8933 [more][less]Zusammenfassung: We introduce a new type of incentive contract for central bankers: inflation forecast contracts, which make central bankers’ remunerations contingent on the precision of their inflation forecasts. We show that such contracts enable central bankers to influence inflation expectations more effectively, thus facilitating more successful stabilization of current inflation. Inflation forecast contracts improve the accuracy of inflation forecasts, but have adverse consequences for output. On balance, paying central bankers according to their forecasting performance improves welfare. Optimal inflation forecast contracts stipulate high rewards for accurate forecasts. Dateien zu dieser Publikation: 0
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TWI-RPS-075-Wolff-2012-03.pdf (1.252Mb)Wolff, Irenaeus (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 75 [more][less]Zusammenfassung: Models of evolutionary game theory have shown that punishment may be an adaptive behaviour in environments characterised by a social-dilemma situation. Experimental evidence closely corresponds to this finding but questions the cooperation-enhancing e ffect of punishment if players are allowed to retaliate against their punishers. This study provides a theoretical explanation for the existence of retaliating behaviour in the context of repeated social dilemmas and analyses the role punishment can play in the evolution of cooperation under these conditions. We show a punishing strategy can pave the way for a partially-cooperative equilibrium of conditional cooperators and defecting types and, under positive mutation rates, foster the cooperation level in this equilibrium by prompting reluctant cooperators to cooperate. However, when rare mutations occur, it cannot sustain cooperation by itself as punishment costs favour the spread of non-punishing cooperators. Dateien zu dieser Publikation: 1
TWI-RPS-075-Wolff-2012-03.pdf (1.252Mb) -
Schwarze.pdf (398.2Kb)Schwarze, Christoph (2012), Working Paper / Technical Report
Arbeitspapiere / Fachbereich Sprachwissenschaft -Nr. 126 [more][less]Zusammenfassung: Les adjectifs participes : des mots construits en morphologie Cette étude porte sur les adjectifs participes, exemplifiés par les formes écrites en italiques dans les exemples donnés sous (1) et (2) : <br /> (1) a. La porte semble ouverte.<br /> b. Les œufs semblent cassés.<br /> c. Les soldats semblent blessés.<br /> (2) a. Du papier vieux et jauni.<br /> b. Un bébé sain et né à terme.<br /> c. Un malaise très tapi.<br /> Nous avons d'abord établi des tests d’adjectivité appropriés à la structure du français. Nous avons ensuite appliqué ces tests à 200 verbes transitifs ou inaccusatifs, ce qui a donné une liste de 188 adjectifs. L'analyse qui suit cette démarche descriptive propose les thèses suivantes :<br /> a) Les formes en question sont de véritables adjectifs, construits en morphologie. Il ne s'agit donc pas de participes « employés comme » des adjectifs.<br /> b) Ces adjectifs sont obtenus par un processus de conversion catégorielle, opérant sur les participes passifs des verbes transitifs (1) et les participes passés des verbes inaccusatifs (2).<br /> c) Le changement catégoriel fait subir aux participes un changement sémantique, qui consiste essentiellement à supprimer la variable d’événement contenue dans les représentations sémantiques des verbes concernés.<br /> d) Les adjectifs ainsi construits peuvent cependant être accompagnés d'ajouts qui sont typiques des événements, en particulier des ajouts d'agent (3) et certains ajouts de temps (4) :<br /> (3) Une région très fréquentée par les touristes.<br /> (4) Un auteur décédé voici 50 ans. e) L'événement, en pareil cas, est accessible par une inférence conceptuelle. Un événement antérieur non spécifié peut cependant être impliqué dans le sens lexical come résultat d'une lexicalisation.<br /> f) Les contraintes pragmatiques sur les adjectifs participes (5) proposées dans la littérature ne s'appliquent pas aux adjectifs comme tels, mais aux syntagmes dans lesquels ils figurent (6). Elles n'ont donc rien à voir avec les processus morphologique comme tel.<br /> (5) ? Une maison construite<br /> (6) Une maison récemment construite<br /> De représentations et des règles sont proposées pour mettre en évidence le caractère systématique de la conversion catégorielle analysée.<br /> a) L'étude se termine par une discussion de la place que les adjectifs participes occupent au sein de la typologie interne de la catégorie adjectivale. On en arrive à la conclusion que les adjectifs participes sont atypiques du point de vue morphologique, mais que, du point de vue syntaxique, ils sont des adjectifs qualitatifs de plein droit. Dateien zu dieser Publikation: 1
Schwarze.pdf (398.2Kb) -
TWI-RPS-077-Wolff.pdf (1.162Mb)Wolff, Irenaeus (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 77 [more][less]Zusammenfassung: Models of evolutionary game theory have shown that punishment may be an adaptive behaviour in environments characterised by a social-dilemma situation. Experimental evidence closely corresponds to this nding but questions the cooperation-enhancing e ect of punishment if players are allowed to retaliate against their punishers. This study provides a theoretical explanation for the existence of retaliating behaviour in the context of repeated social dilemmas and analyses the role punishment can play in the evolution of cooperation under these conditions. We show a punishing strategy can pave the way for a partially-cooperative equilibrium of conditional cooperators and defecting types and, under positive mutation rates, foster the cooperation level in this equilibrium by prompting reluctant cooperators to cooperate. However, when rare mutations occur, it cannot sustain cooperation by itself as punishment costs favour the spread of non-punishing cooperators. Dateien zu dieser Publikation: 1
TWI-RPS-077-Wolff.pdf (1.162Mb) -
Burgdorf.pdf (448.0Kb)Burgdorf, Sabine; Cafuta, Kristijan; Klep, Igor; Povh, Janez (2012), Working Paper / Technical Report
Konstanzer Schriften in Mathematik -Nr. 293 [more][less]Zusammenfassung: This paper presents an algorithm and its implementation in the software package NCSOStools for finding sums of hermitian squares and commutators decompositions for polynomials in noncommuting variables. The algorithm is based on noncommutative analogs of the classical Gram matrix method and the Newton polytope method, which allows us to use semidefinite programming. For rational polynomials numerical evidence can be tweaked to obtain an exact certificate using rational numbers. In the presence of Slater points, the Peyrl-Parrilo rounding and projecting method applies. On the other hand, in the absence of strict feasibility, a variant of the facial reduction is proposed to reduce the size of the semidefinite program and to enforce the existence of Slater points. Dateien zu dieser Publikation: 1
Burgdorf.pdf (448.0Kb) -
Fischbacher, Urs; Schudy, Simeon; Teyssier, Sabrina (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 73 [more][less]Zusammenfassung: In many cases individuals benefit differently from the provision of a public good. We study in a laboratory experiment how heterogeneity in returns and uncertainty affects unconditional and conditional contribution behavior in a linear public goods game. The elicitation of conditional contributions in combination with a within subject design allows us to investigate belief-independent and type-specific reactions to heterogeneity. We find that, on average, heterogeneity in returns decreases unconditional contributions but does not affects conditional contributions only weakly. Uncertainty in addition to heterogeneity reduces conditional contributions slightly. Individual reactions to heterogeneity differ systematically. Selfish subjects and one third of conditional cooperators do not react to heterogeneity whereas the reactions of the remaining conditional cooperators vary. A substantial part of heterogeneity in reactions can be explained by inequity aversion which accounts for different reference groups subjects compare to. Dateien zu dieser Publikation: 1
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TWI-RPS-078-Reiss-Wolff-2012.pdf (1.772Mb)Reiß, J. Philipp; Wolff, Irenaeus (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 78 [more][less]Zusammenfassung: We examine the incentive effects of funding contracts on entrepreneurial effort decisions and allocative efficiency. We experiment with funding contracts that differ in the structure of investor repayment and, therefore, in the incentives for entrepreneurial e ffort provision. Theoretically the replacement of a standard debt contract by a repayment-equivalent non-monotonic contract reduces e ort distortions and increases efficiency. Likewise the replacement of outside equity by a repayment-equivalent standard-debt contract mitigates distortions. We test both hypotheses in the laboratory. Our results reveal that the incentive e ffects of funding contracts need to be experienced before they reflect in observed behavior. With sufficient experience observed behavior is consistent with the theoretical predictions and supports both hypotheses. If we allow for entrepreneur-sided manipulations of the project outcome we find that non-monotonic contracts lose its appeal. Dateien zu dieser Publikation: 1
TWI-RPS-078-Reiss-Wolff-2012.pdf (1.772Mb) -
WP_DiPace-Hertweck_9-12.pdf (1.019Mb)Di Pace, Federico; Hertweck, Matthias Sebastian (2012), Working Paper / Technical Report
Working Paper Series / Department of Economics -Nr. 2012-09 [more][less]Zusammenfassung: The standard two-sector monetary business cycle model suffers from an important deficiency. Since durable good prices are more flexible than non-durable good prices, optimising households build up the stock of durable goods at low cost after a monetary contraction. Consequently, sectoral outputs move in opposite directions. This paper finds that labour market frictions help to understand the so-called sectoral “comovement puzzle”. Our benchmark model with staggered Right-to-Manage wage bargaining closely matches the empirical elasticities of output, employment and hours per worker across sectors. The model with Nash bargaining, in contrast, predicts that firms adjust employment exclusively along the extensive margin. Dateien zu dieser Publikation: 1
WP_DiPace-Hertweck_9-12.pdf (1.019Mb) -
Balabanova-Brueggemann_WP_5-12.pdf (1.092Mb)Balabanova, Zlatina; Brüggemann, Ralf (2012), Working Paper / Technical Report
Working Paper Series / Department of Economics -Nr. 2012-05 [more][less]Zusammenfassung: We investigate the e_ects of monetary policy shocks in the new European Union member states Czech Republic, Hungary, Poland and Slovakia. In contrast to existing studies, we explicitly account for external developments in European Monetary Union (EMU) countries and in other acceding countries. We do so by using factor-augmented vector-autoregressive models that employ the information from non-stationary factor time series. One set of VAR models includes factors obtained from a large cross-section of time series from EMU countries, while another set includes factors obtained from other acceding countries. We use cohesion analysis to facilitate the interpretation of the different factor time series. We find that including the EMU factors does not greatly affect the impulse response patterns in acceding countries. In contrast, including factors from other accession countries leads to substantial changes in impulse responses and to economically more plausible results. Overall, our analysis highlights that taking into account external economic developments properly is crucial for the analysis of monetary policy in the new EU member states. Dateien zu dieser Publikation: 1
Balabanova-Brueggemann_WP_5-12.pdf (1.092Mb) -
307_Barraza_Denk.pdf (810.6Kb)Barraza Martinez, Bienvenido,; Denk, Robert; Hernandez Monzon, Jairo, (2012), Working Paper / Technical Report
Konstanzer Schriften in Mathematik -Nr. 307 [more][less]Zusammenfassung: In this paper, we consider pseudodifferential operators with operator-valued symbols and their mapping properties, without assumptions on the underlying Banach space. We show that, under suitable parabolicity assumptions, the realization of the operator in the standard Sobolev space generates an analytic semigroup. An application to non-autonomous pseudodifferential Cauchy problems gives the existence and uniqueness of a classical solution. Our approach is based on oscillatory integrals and kernel estimates for them. Dateien zu dieser Publikation: 1
307_Barraza_Denk.pdf (810.6Kb) -
UrbanVolkweinZeeb.pdf (1.113Mb)Urban, Karsten; Volkwein, Stefan; Zeeb, Oliver (2012), Working Paper / Technical Report
Konstanzer Schriften in Mathematik -Nr. 308 [more][less]Zusammenfassung: We consider the reduced basis generation in the offline stage. As an alternative for standard Greedy-training methods based upon a-posteriori error estimates on a training subset of the parameter set, we consider a nonlinear optimization combined with a Greedy method. We define an optimization problem for selecting a new parameter value on a given reduced space. This new parameter is then used --in a Greedy fashion-- to determine the corresponding snapshot and to update the reduced basis. We show the well-posedness of this nonlinear optimization problem and derive first- and second-order optimality conditions. Numerical comparisons with the standard Greedy-training method are shown. Dateien zu dieser Publikation: 1
UrbanVolkweinZeeb.pdf (1.113Mb) -
Leue_212906.pdf (784.4Kb)Leitner-Fischer, Florian; Leue, Stefan (2012), Working Paper / Technical Report
Technical Report soft -Nr. 12-02 [more][less]Zusammenfassung: We present an approach for the algorithmic computation of causalities in system models that we refer to as causality checking. We are basing our notion of causality on counterfactual reasoning, in particular using the structural equation model approach by Halpern and Pearl that we recently have extended to reason about computational models. In this paper we present a search-based on-the-fly approach that nicely integrates into nite state veri cation techniques, such as explicit-state model checking. We demonstrate the applicability of our approach using an industrial case study. Dateien zu dieser Publikation: 1
Leue_212906.pdf (784.4Kb) -
TWI-RPS-074-Heinrich-Wolff-2012-03.pdf (776.7Kb)Heinrich, Timo; Wolff, Irenaeus (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 74 [more][less]Zusammenfassung: Aggregate behavior in two-player hide-and-seek games deviates systematically from the mixed-strategy equilibrium prediction of assigning all actions equal probabilities (Rubinstein and Tversky, 1993, Rubinstein et al., 1996, Rubinstein, 1999). As Crawford and Iriberri (2007) point out, this deviation can be explained by strategic level- k reasoning. Here we provide empirical evidence that, indeed, it is non-equilibrium beliefs that lead to the behavior observed in the earlier studies: when a player's opponent is forced to play the equilibrium strategy, the player's choices are uniformly spread over the action space. At the same time, we nd robust evidence of an unexpected framing e ffect. Dateien zu dieser Publikation: 1
TWI-RPS-074-Heinrich-Wolff-2012-03.pdf (776.7Kb) -
TWI-RPS-076-Schudy-Utikal-2012-06.pdf (2.427Mb)Schudy, Simeon; Utikal, Verena (2012), Working Paper / Technical Report
Research paper series / Thurgauer Wirtschaftsinstitut -Nr. 76 [more][less]Zusammenfassung: We investigate the consequences of imperfect data privacy on information acquisition about personal health status. In a simplified game of persuasion players decide on whether or not to acquire information about their health status before searching for a matching partner (e.g. an insurance company). We contrast three institutional settings: automatic dissemination of certified test results, perfect data privacy and imperfect data privacy about certified test results (i.e. potentially involuntary dissemination). Assuming that the ex-ante expected payoff of a match with an unknown type is positive, we find that equilibria with complete information acquisition and complete information revelation exist only under perfect and imperfect data privacy whereas equilibria without any information acquisition exist under all institutional settings. We test our predictions in a laboratory experiment. Indeed, both imperfect and perfect data privacy yield almost perfect information acquisition. Automatic dissemination leads to incomplete information acquisition. Dateien zu dieser Publikation: 1
TWI-RPS-076-Schudy-Utikal-2012-06.pdf (2.427Mb) -
Heck.etal-2012-AFBNS.pdf (8.640Mb)Heck, Daniel; Schlömer, Thomas; Deussen, Oliver (2012), Working Paper / Technical Report[more][less]
Zusammenfassung: In this paper we revisit the problem of blue noise sampling with a strong focus on the spectral behavior of the sampling patterns. We use the mathematical relationship between the radial power spectrum and the radial distribution function to synthesize two types of blue noise patterns: ideal blue noise patterns that have a power spectrum in form of a step function and produce almost no coherent aliasing, and effective blue noise patterns that have a high effective Nyquist frequency and produce a controlled amount of aliasing. We give a definition for this effective Nyquist frequency in stochastic sampling and propose an error metric that characterizes the amount and spectral distribution of aliasing. We show that our blue noise sets avoid most of the artifacts caused by oscillations in the power spectra of existing blue noise patterns. Finally, we present a new algorithm for constructing point sets with a given power spectrum. Dateien zu dieser Publikation: 1
Heck.etal-2012-AFBNS.pdf (8.640Mb)
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