Bessel Integrals and Fundamental Solutions for a Generalized Tricomi Operator

Partial Fourier transforms are used to find explicit formulas for two remarkable fundamental solutions for a generalized Tricomi operator. These fundamental solutions reflect clearly the mixed type of the operator. In order to prove these results, we establish explicit formulas for Fourier transforms of some type of Bessel functions

Modeling formalisms for dynamic structure systems

We present a new concept for a system network to represent systems that are able to undergo structural change. Change in structure is defined in general terms, and includes the addition and deletion of systems and the modification of the relations among components. The structure of a system network is stored in the network executive. Any change in structure-related information is mapped into modifications in the network structure.Based on these concepts, we derive three new system specifications that provide a shorthand notation to specify classes of dynamic structure systems. These new formalisms are: dynamic structure discrete time system, dynamic structure differential equation specified systems, and dynamic structure discrete event system specification. We demonstrate that these formalisms are closed under coupling, making hierarchical model construction possible. formalisms are described using set theoretic notation and general systems theory concepts

piHyFlow Operational Semantics

Simulation models have been described using different perspectives, or worldviews. In the process interaction world view (PI), every entity is modeled by a sequence of actions describing its life cycle, offering a comprehensive model that groups the events involving each entity. In this paper we describe piHyFlow, a formalism for representing hybrid models using a set of communicating processes. This set is dynamic, enabling processes to be created and destroyed at runtime. Processes are encapsulated into piHyFlow base models and communicate through shared memory. piHyFlow, however, can guarantee modularity by enforcing that models can only communicate by input and output interfaces. piHyFlow extends current PI approaches by providing support for HyFlow concepts of sampling and dense (continuous) outputs, in addition to the more traditional event-based communication. In this paper we present piHyFlow operational semantics using the concepts of simulator and component

Representing Tactics for Fault Recovery: A Reconfigurable, Modular, and Hierarchical Approach

We show the advantages of modular and hierarchical design in obtaining fault-tolerant software. Modularity enables the identification of faulty software units simplifying key operations, like software removal and replacement. We describe three approaches to repair faulty software based on replication, namely, Passive Replication, N-Version Replication, and Active Replication, based on modular components. We show that the key construct to represent these tactics is the ability to make ad hoc changes in software topologies. We consider hierarchical mobility as a useful operation to introduce new software units for replacing faulty ones. For illustration purposes, we use connecton, a hierarchical, modular, and self-modifying software specification formalism, and its implementation in the Desmos framework

Focus and coverage of Bolsa Família Program in the Pelotas 2004 birth cohort

OBJECTIVE To describe the focalization and coverage of Bolsa Família Program among the families of children who are part of the 2004 Pelotas birth cohort (2004 cohort). METHODS The data used derives from the integration of information from the 2004 cohort and the Cadastro Único para Programas Sociais do Governo Federal (CadÚnico – Register for Social Programs of the Federal Government), in the 2004-2010 period. We estimated the program coverage (percentage of eligible people who receive the benefit) and its focus (proportion of eligible people among the beneficiaries). We used two criteria to define eligibility: the per capita household income reported in the cohort follow-ups and belonging to the 20% poorest families according to the National Economic Indicator (IEN), an asset index. RESULTS Between 2004 and 2010, the proportion of families in the cohort that received the benefit increased from 11% to 34%. We observed an increase in all wealth quintiles. In 2010, by income and wealth quintiles (IEN), 62%-72% of the families were beneficiaries among the 20% poorest people, 2%-5% among the 20% richest people, and about 30% of families of the intermediate quintile. According to household income (minus the benefit) 29% of families were eligible in 2004 and 16% in 2010. By the same criteria, the coverage of the program increased from 43% in 2004 to 71% in 2010. In the same period, by the wealth criterion (IEN), coverage increased from 29% to 63%. The focalization of the program decreased from 78% in 2004 to 32% in 2010 according to income, and remained constant (37%) according to the IEN. CONCLUSIONS Among the families of the 2004 cohort, there was a significant increase in the program coverage, from its inception until 2010, when it was near 70%. The focus of the program was below 40% in 2010, indicating that more than half of the beneficiaries did not belong to the target population.OBJETIVO Descrever a focalização e a cobertura do Programa Bolsa Família nas famílias de crianças que fazem parte da coorte de nascimentos de Pelotas, 2004 (coorte de 2004). MÉTODOS Os dados utilizados derivam da integração de informações da coorte de 2004 e do Cadastro Único para Programas Sociais do Governo Federal, no período de 2004 a 2010. Estimamos a cobertura do programa (percentual de elegíveis que recebem bolsa) e seu foco (proporção de elegíveis entre os beneficiários). Utilizamos dois critérios para definir elegibilidade: a renda familiar per capita relatada nas avaliações da coorte e pertencer aos 20,0% mais pobres pela classificação do Indicador Econômico Nacional, um índice de bens. RESULTADOS Entre 2004 e 2010, a proporção de famílias beneficiárias da coorte passou de 11% para 34%. Houve aumento em todos os quintis de riqueza. Em 2010, por quintis de renda e Indicador Econômico Nacional, 62%-72% das famílias eram beneficiárias entre os 20% mais pobres, 2%-5% entre os 20% mais ricos, e cerca de 30% das famílias do quintil intermediário. Pelo critério de renda familiar, excluindo-se o valor do benefício do programa, 29% das famílias eram elegíveis em 2004 e 16% em 2010. Pelo mesmo critério, a cobertura do programa passou de 43% em 2004 para 71% em 2010. No mesmo período, pelo critério de riqueza (Indicador Econômico Nacional), a cobertura passou de 29% para 63%. A focalização do programa caiu de 78% em 2004 para 32% em 2010 de acordo com a renda e permaneceu constante (37%) de acordo com o Indicador Econômico Nacional. CONCLUSÕES Entre as famílias da coorte de 2004, observa-se aumento importante da cobertura do programa, de seu início até 2010, quando ficou perto de 70%. O foco do programa ficou abaixo de 40% em 2010, indicando que mais da metade dos beneficiários não pertencem à população alvo

04041 Abstracts Collection -- Component-Based Modeling and Simulation

From 18.01.04 to 23.01.04, the Dagstuhl Seminar 04041 ``Component-Based Modeling and Simulation\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

Fractional order calculus on the estimation of short-circuit impedance of power transformers

This paper reports investigation on the use of fractional order calculus to analytically estimate the inlfuence of skin and proximity effects in the short circuit impedance of power transformers. The aim is to better characterize the medium frequency range behavior of leakage inductances of power transformer models, which include terms to represent the magnetic field diffusion process in the windigns. Comparisons between calculated and measured values are shown and discussed.N/

On the Estimation of the Short-Circuit Impedance of Power Transformers Using Fractional Order Calculus

This paper reports investigation on the estimation of the short circuit impedance of power transformers, using fractional order calculus to analytically study the influence of the diffusion phenomena in the windings. The aim is to better characterize the medium frequency range behavior of leakage inductances of power transformer models, which include terms to represent the magnetic field diffusion process in the windings. Comparisons between calculated and measured values are shown and discussed