5,777 research outputs found
Symmetry groupoids and admissible vector fields for coupled cell networks
The space of admissible vector fields, consistent with the structure of a network of coupled dynamical systems, can be specified in terms of the network's symmetry groupoid. The symmetry groupoid also determines the robust patterns of synchrony in the network â those that arise because of the network topology. In particular, synchronous cells can be identified in a canonical manner to yield a quotient network. Admissible vector fields on the original network induce admissible vector fields on the quotient, and any dynamical state of such an induced vector field can be lifted to the original network, yielding an analogous state in which certain sets of cells are synchronized. In the paper, necessary and sufficient conditions are specified for all admissible vector fields on the quotient to lift in this manner. These conditions are combinatorial in nature, and the proof uses invariant theory for the symmetric group. Also the symmetry groupoid of a quotient is related to that of the original network, and it is shown that there is a close analogy with the usual normalizer symmetry that arises in group-equivariant dynamics
Caracterização fenotĂpica dos efeitos do QTL ANXRR16 atravĂ©s do uso de ratas das linhagens congĂȘnica SLA16 e SHR
TCC(graduação) - Universidade Federal de Santa Catarina. Centro de CiĂȘncias BiolĂłgicas. Biologia.A maioria dos estudos biomĂ©dicos e prĂ©-clĂnicos utiliza somente machos como animais de experimentação, ignorando as diferenças fisiolĂłgicas entre os sexos. Isso pode levar a medicamentos com menor efeito especĂfico e com maior toxicidade para mulheres. Um ponto que alguns pesquisadores argumentam como causa para negligenciar as fĂȘmeas em pesquisas cientĂficas Ă© que elas apresentam grande variação hormonal no seu ciclo estral. Assim, o nĂșmero de fĂȘmeas deveria ser 4X maior, pois algumas pesquisas mostram que em cada fase do ciclo estral, elas se comportam de maneira distinta. OBJETIVOS- Neste trabalho buscou-se fazer uma caracterização fenotĂpica dos efeitos do QTL Anxrr16 em fĂȘmeas de duas linhagens de ratos. Materiais e mĂ©todos-Para isso, foram testadas as ratas das linhagens congĂȘnica SLA16 (n=10) e SHR (N=9), por 4 dias seguidos, no teste triplo (TT) levando em conta o ciclo estral (DP=diestro-proestro e EM=estro-metaestro) (experimento 1). AlĂ©m disso, avaliou-se a resposta das fĂȘmeas destas duas linhagens, SLA16 (n=20), SHR= (n=20), a um antagonista D2 nĂŁo seletivo, nos testes do campo aberto e labirinto em cruz elevado (experimento 2). RESULTADOS- No experimento 1, no dia1, as fĂȘmeas DP tiveram maior locomoção central que EM. JĂĄ no dia, 4 as fĂȘmeas EM tiveram um maior nĂșmero de entradas no compartimento claro. No experimento 2, foi observado um efeito farmacogenĂ©tico no LCE, onde as ratas SHR sĂŁo menos sensĂveis aos efeitos do haloperidol, em comparação as ratas SLA16. CONCLUSĂES- Assim sugere-se que o ciclo estral influencia o comportamento das fĂȘmeas destas linhagens no TT e que os efeitos fenotĂpicos do QTL Anxrr16 podem ser devidos, ao menos em parte e no LCE, a receptores dopaminĂ©rgicos do tipo D2
Illness control and knowledge evaluation on individuals with diabetes mellitus
The Diabetes Mellitus is a disease without cure which affects approximately a half million of Portuguese people. There is an epidemic expansion and appears like the source or motive of several healthy problems.
It is a complex disease to control due to numerous factors, in which, the own patientâs care, inadequate food, the sedentarism, the lack of knowledge of the consequences, and others.
The main objectives of this work are to evaluate the present glucose in the blood in the collect day; to evaluate the glycol haemoglobin (HbA1c); to evaluate the patientâs knowledge height and care according the diabetes; to report the diary glucose and the glycol haemoglobin rates with the disease knowledge.
The study occurs with 54 diabetic individuals of type 2, no dependents of insulin, who are treated in the diabetology appointment from the âCentro Hospitalar Cova da Beiraâ, both sexes, with ages from 48 to 92.
The analyses of the results, reveals in the studied sample that a glycaemia rate was bigger than it was expected for these diseased people, on the other hand, the HbA1c, is in an acceptable rate; there was a very low correlation between the glycaemia and HbA1c ; we also checked that the knowledge donât set apart according the gender and age and the knowledge donât influence the glycaemia rates nor the HbA1c
Curiosidades MatemĂĄticas: Ă descoberta dos Fractais
No Ano Mundial da MatemĂĄtica â ano 2000, o Departamento de MatemĂĄtica da
ESTV realizou algumas actividades com o intuito de comemorar este evento. Para tal
propusemo-nos dinamizar a sessĂŁo: âĂ descoberta dos fractaisâ para alunos do 2Âș e 3Âș
ciclos, enquadrada nas âtardes de matemĂĄticaâ.
Escolhemos esta sessĂŁo por abordar um tema recente e pouco conhecido dos
alunos: os objectos fractais, que surgem envoltos num ambiente âmĂĄgicoâ e
contemporĂąneo dos computadore
Comparison of different rules to deal with incomplete information: perspectives of mediation
In bilateral Negotiation Analysis, the literature often considers the case with complete information.
In this context, since the value (or utility) functions of both parties are known, it is not difficult to
calculate the Pareto frontier (or efficient frontier) and the Pareto efficient solutions for the negotiation.
Thus rational actors can reach agreement on this frontier. However, these approaches are not applied
in practice when the parties do not have complete information. Considering that the additive value
(or utility) function is used, often it is not easy to obtain precise values for the scaling weights or the
levelsâ value in each issue. We compare four decision rules that require weaker information, namely
ordinal information on weights and levels, to help a mediator suggesting an alternative under these
circumstances. These rules are tested using Monte-Carlo simulation, considering that the mediator
would be using one of three criteria: maximizing the sum of the values, maximizing the product
of the excesses regarding the reservation levels, or maximizing the minimal proportion of potential.
Simulations asses how good is the alternative chosen by each rule, computing the value loss with
respect to the alternative that would be suggested if there was precise cardinal information and
determining if the chosen alternative is efficient or, if not, how far is the nearest efficient alternative.
We also provide guidelines about how to use these rules in a context of selecting a subset of the
most promising alternatives, considering the contradictory objectives of keeping a low number of
alternatives yet not excluding the best one. A further issue we investigate is whether using only
ordinal information leads to treat one of the parties unfairly, when compared to a situation in which
precise cardinal values were used instead
Multi-attribute choice with ordinal information: a comparison of different decision rules
In the context of additive multiattribute aggregation,
we address problems with ordinal information, i.e., considering
a ranking of the weights (the scaling coefficients). Several rules
for ranking alternatives in these situations have been proposed
and compared, such as the rank-order-centroid weight, minimum
value, central value, and maximum regret rules. This paper compares
these rules, together with two rules that had never been studied
(quasi-dominance and quasi-optimality) that use a tolerance
parameter to extend the concepts of dominance and optimality.
Another contribution of this paper is the study of the behavior
of these rules in the context of selecting a subset of the most
promising alternatives. This study intends to provide guidelines
about which rules to choose and how to use them (e.g., how many
alternatives to retain and what tolerance to use), considering the
contradictory goals of keeping a low number of alternatives yet not
excluding the best one. The comparisons are grounded on Monte
Carlo simulations
PROTEĂĂO SOCIAL E ACOMPANHAMENTO FAMILIAR: REFLEXĂES SOBRE O TRABALHO NA POLĂTICA DE ASSISTĂNCIA SOCIAL
Resumo O presente trabalho tem como objetivo problematizar alguns dos desafios presentes no desenvolvimento das açÔes do Estado em relação ao grupo familiar no Ăąmbito da polĂtica de assistĂȘncia social, bem como apontar possĂveis potencialidades. Este trabalho Ă© fruto das reflexĂ”es acerca do trabalho com famĂlias sistematizadas no projeto de pesquisa desenvolvido para a qualificação das propostas de estudos de dissertação de mestrado em Serviço Social. Entendendo que o trabalho social com famĂlias nĂŁo se dĂĄ de forma neutra ou puramente tĂ©cnica, mas envolve tambĂ©m aspectos Ă©ticos, polĂticos e culturais, as intervençÔes direcionadas Ă s famĂlias precisam ser alvo de estudos aprofundados e anĂĄlises especĂficas e vinculadas a totalidade da realidade social
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