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Using Actors to Implement Sequential Simulations2015 April 1900 (has links)
This thesis investigates using an approach based on the Actors paradigm for implementing a discrete
event simulation system and comparing the results with more traditional approaches. The goal of this work
is to determine if using Actors for sequential programming is viable. If Actors are viable for this type of
programming, then it follows that they would be usable for general programming. One potential advantage
of using Actors instead of traditional paradigms for general programming would be the elimination of a
distinction between designing for a sequential environment and a concurrent/distributed one. Using Actors
for general programming may also allow for a single implementation that can be deployed on both single core
and multiple core systems.
Most of the existing discussions about the Actors model focus on its strengths in distributed environments
and its ability to scale with the amount of available computing resources. The chosen system for implementation
is intentionally sequential to allow for examination of the behaviour of existing Actors implementations
where managing concurrency complexity is not the primary task. Multiple implementations of the simulation
system were built using different languages (C++, Erlang, and Java) and different paradigms, including
traditional ones and Actors. These different implementations were compared quantitatively, based on their
execution time, memory usage, and code complexity.
The analysis of these comparisons indicates that for certain existing development environments, Erlang/OTP,
following the Actors paradigm, produces a comparable or better implementation than traditional
paradigms. Further research is suggested to solidify the validity of the results presented in this research and
to extend their applicability.
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Application of Plasmon Polaritons in Nanophotonics / Application of Plasmon Polaritons in NanophotonicsBřínek, Lukáš January 2015 (has links)
Práce pojednává o vlastnostech plazmonických antén v infračervené a viditelné oblasti. Práce zahrnuje výrobu, měření a numerické modelování optických vlastností antén. Infračervené plazmonické antény na absorbujícím substrátu (SRON) jsou studovány pro jejich rezonanční a absorpční vlastnosti. Byla nalezena geometrie antény, která poskytuje maximální účinnost absorpce ve SRON vrstvě. Dále je studována možnost zesílení daného vibračního módu substrátu (obsahujícího 3-4 materiálové rezonance) pomocí plazmonické rezonance antény. Nakonec jsou prezentována měření katodoluminiscenčních spekter antén ve viditelném spektru.
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Estabilidade global e aplicações ao modelo epidemiológico SEIRSNovais, Michele Mendes 11 September 2015 (has links)
In this dissertation, we provide necessary conditions for an asymptotically stable
equilibrium solution of a nonlinear ordinary differential equation be globally stable.
An essential condition is a generalization of the criteria of Bendixson and Dulac for towdimensional differential equations which is used to ensure the absence of periodic orbits, we call this Bendixson criterion. We provide a new Bendixson criterion robust under C1 local perturbations, which together with the Global Stability Principle, ensure the global stability of an asymptotically stable equilibrium. We use this criterion in the study of asymptotic behavior of an epidemiological model called SEIRS / Nesta dissertação, forneceremos condições necessárias para que umasolução de equilíbrio
assintoticamente estável de uma equação diferencial ordinária autônoma e não linear
seja globalmente estável. Uma das condições essenciais consiste numa generalização dos
critérios de Bendixson e Dulac para equações diferenciais bidimensionais que é usada para
garantir a inexistência de órbitas periódicas, o qual denominamos critério de Bendixson.
Forneceremos um novo critério de Bendixson robusto sobre uma C1 perturbação local, o
qual juntamente como Princípio da EstabilidadeGlobal, garante a estabilidade global deum
equilíbrio assintoticamente estável. Usaremos este critério no estudo do comportamento
assintótico de um modelo epidemiológico intitulado SEIRS.
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