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Search Results: 1 - 10 of 108 matches for " Kreimer "
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Performance Evaluation of Multiple Unmanned Aerial Vehicles Operating in General Regime with Shortage of Maintenance Facilities  [PDF]
Joseph Kreimer
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.410008
Abstract: We consider a real-world problem of military intelligence unit equipped with multiple identical unmanned aerial vehicles (UAV) responsible for several regions (with requests of real-time jobs arriving from independent sources). We suppose that there are no ample maintenance facilities, allowing simultaneous treatment of all vehicles if necessary. Under certain assumptions, these real-time systems can be treated using a queueing theory methodology and/or as Markov chains. We show how to compute steady-state probabilities of these systems, their performance effectiveness, and various performance parameters (for exponentially distributed service and maintenance times of UAVs, as well as tasks duration and their arrival pattern).
Real Time Systems with Nonpreemptive Priorities and Ample Maintenance Facilities  [PDF]
Joseph Kreimer, Edward Ianovsky
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.37004
Abstract: We consider a real time data acquisition and processing multiserver system with identical servers (such as unmanned aerial vehicles, machine controllers, overhearing devices, medical monitoring devices, etc.) which can be maintained/programmed for different kinds of activities (e.g. passive or active). This system provides a service for real time tasks arriving via several channels (such as surveillance regions, assembly lines, communication channels, etc.) and involves maintenance. We focus on the worst case analysis of the system with ample maintenance facilities exponentially distributed time to failure and maintenance times. We consider two kinds of models (with and without nonpreemptive priorities) and provide balance equations for steady state probabilities and various performance measures, when both operation and maintenance times are exponentially distributed.
Multiserver Multichannel Real-Time System with Limited Maintenance Facilities under Maximum Load  [PDF]
Edward Ianovsky, Joseph Kreimer
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.57037
Abstract: We consider a multi server and multichannel real-time system with identical servers (e.g. unmanned aerial vehicles, machine controllers, etc.) that provide services for requests of real-time jobs arriving via several different channels (e.g. surveillance regions, assembly lines, etc.) working under maximum load regime. Each channel has its own constant numbers of jobs inside at any instant. Each channel has its own specifications, and therefore different kinds of equipment and inventory are needed to serve different channels. There is a limited number of identical maintenance teams (less than the total number of servers in the system). We compute analytically steady- state probabilities of this system, its availability, loss penalty function and other performance characteristics, when both service and maintenance times are exponentially distributed.
Dos culturas o múltiples culturas? Ciencias duras, ciencias blandas y science studies
Pablo Kreimer
Medicina (Buenos Aires) , 2010,
Abstract:
Dependientes o integrados?
Pablo Kreimer
Nómadas , 2006,
Abstract: En el desarrollo de la ciencia latinoamericana la internacionalización desempe ó un papel crucial. Hoy, diversos procesos emergentes –tecnologías de la información y comunicación, modalidades de financiamiento de I+D en los países desarrollados–, muestran una nueva tendencia: una forma de división internacional del trabajo científico, donde los grados de libertad en la definición de agendas y aun en la selección de técnicas de los grupos en la periferia, parecen más determinados que en el pasado. Ello tiene consecuencias para las relaciones “ciencia/sociedad” en los países latinoamericanos.
Tensor Integrals for Two Loop Standard Model Calculations
Dirk Kreimer
Physics , 1993, DOI: 10.1142/S0217732394000927
Abstract: We give a new method for the reduction of tensor integrals to finite integral representations and UV divergent analytic expressions. This includes a new method for the handling of the gamma-algebra. TYPO IN EQUATION (5) CORRECTED, MACROS REORDERED.
How useful can knot and number theory be for loop calculations?
Dirk Kreimer
Physics , 1998,
Abstract: We summarize recent results connecting multiloop Feynman diagram calculations to different parts of mathematics, with special attention given to the Hopf algebra structure of renormalization.
Chen's Iterated Integral represents the Operator Product Expansion
Dirk Kreimer
Physics , 1999,
Abstract: The recently discovered formalism underlying renormalization theory, the Hopf algebra of rooted trees, allows to generalize Chen's lemma. In its generalized form it describes the change of a scale in Green functions, and hence relates to the operator product expansion. Hand in hand with this generalization goes the generalization of the ordinary factorial $n!$ to the tree factorial $t^!$. Various identities on tree-factorials are derived which clarify the relation between Connes-Moscovici weights and Quantum Field Theory.
A remark on quantum gravity
Dirk Kreimer
Physics , 2007, DOI: 10.1016/j.aop.2007.06.005
Abstract: We discuss the structure of Dyson--Schwinger equations in quantum gravity and conclude in particular that all relevant skeletons are of first order in the loop number. There is an accompanying sub Hopf algebra on gravity amplitudes equivalent to identities between n-graviton scattering amplitudes which generalize the Slavnov Taylor identities. These identities map the infinite number of charges and finite numbers of skeletons in gravity to an infinite number of skeletons and a finite number of charges needing renormalization. Our analysis suggests that gravity, regarded as a probability conserving but perturbatively non-renormalizable theory, is renormalizable after all, thanks to the structure of its Dyson--Schwinger equations.
Renormalization and Knot Theory
Dirk Kreimer
Physics , 1994,
Abstract: We investigate to what extent renormalization can be understood as an algebraic manipulation on concatenated one-loop integrals. We find that the resulting algebra indicates a useful connection to knot theory.
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