1,976 research outputs found
Intersemiotic translation and transformational creativity
In this article we approach a case of intersemiotic translation as a paradigmatic example of Boden’s ‘transformational creativity’ category. To develop our argument, we consider Boden’s fundamental notion of ‘conceptual space’ as a regular pattern of semiotic action, or ‘habit’ (sensu Peirce). We exemplify with Gertrude Stein’s intersemiotic translation of Cézanne and Picasso’s proto-cubist and cubist paintings. The results of Stein’s IT transform the conceptual space of modern literature, constraining it towards new patterns of semiosis. Our association of Boden’s framework to describe a cognitive creative phenomenon with a philosophically robust theory of meaning results in a cognitive semiotic account of IT
A Structured Systems Approach for Optimal Actuator-Sensor Placement in Linear Time-Invariant Systems
In this paper we address the actuator/sensor allocation problem for linear
time invariant (LTI) systems. Given the structure of an autonomous linear
dynamical system, the goal is to design the structure of the input matrix
(commonly denoted by ) such that the system is structurally controllable
with the restriction that each input be dedicated, i.e., it can only control
directly a single state variable. We provide a methodology that addresses this
design question: specifically, we determine the minimum number of dedicated
inputs required to ensure such structural controllability, and characterize,
and characterizes all (when not unique) possible configurations of the
\emph{minimal} input matrix . Furthermore, we show that the proposed
solution methodology incurs \emph{polynomial complexity} in the number of state
variables. By duality, the solution methodology may be readily extended to the
structural design of the corresponding minimal output matrix (commonly denoted
by ) that ensures structural observability.Comment: 8 pages, submitted for publicatio
On the Complexity of the Constrained Input Selection Problem for Structural Linear Systems
This paper studies the problem of, given the structure of a linear-time
invariant system and a set of possible inputs, finding the smallest subset of
input vectors that ensures system's structural controllability. We refer to
this problem as the minimum constrained input selection (minCIS) problem, since
the selection has to be performed on an initial given set of possible inputs.
We prove that the minCIS problem is NP-hard, which addresses a recent open
question of whether there exist polynomial algorithms (in the size of the
system plant matrices) that solve the minCIS problem. To this end, we show that
the associated decision problem, to be referred to as the CIS, of determining
whether a subset (of a given collection of inputs) with a prescribed
cardinality exists that ensures structural controllability, is NP-complete.
Further, we explore in detail practically important subclasses of the minCIS
obtained by introducing more specific assumptions either on the system dynamics
or the input set instances for which systematic solution methods are provided
by constructing explicit reductions to well known computational problems. The
analytical findings are illustrated through examples in multi-agent
leader-follower type control problems
Agências de notÃcias do Sul: resultados preliminares de um levantamento
1º Congresso Internacional Epistemologias do Sul: perspectivas crÃticas - 7 a 9 de novembro de 2016, realizada pela Universidade Federal da Integração Latino-Americana (UNILA).Como grande parte da pesquisa acadêmica, mesmo a realizada no Brasil e outros
paÃses periféricos ou semiperiféricos, também os estudos em Comunicação partem de dados,
empirias e pressupostos particulares do Norte (ou das regiões centrais do capital),
frequentemente tomando-os como universais. Além disso, nos campos da Comunicação e do
Jornalismo, especificamente, fala-se pouco de agências de notÃcias, de forma geral. E este
pouco que se fala é, na maioria das referências bibliográficas, concentrado nas grandes
agências dos paÃses desenvolvidos, como a Reuters britânica (agora anglo-canadense), a
Associated Press norte-americana e a AFP francesa. Mesmo quando se trata de estudos
feitos no Brasil, na América Latina e nos paÃses periféricos, frequentemente estes se
debruçam sobre a influência e o aproveitamento destas grandes agências na imprensa e na
mÃdia dessas regiões, num evidente reforço da perspectiva Norte-Sul
Growth, Centrism and Semi-Presidentialism: Forecasting the Portuguese General Elections
Electoral behaviour in recently established democracies has been more frequently treated from the point of view of its unpredictability, volatility and personalistic elements than that of its "fundamentals". In this paper, we wish to contribute to redress this imbalance by advancing a forecasting model for general elections in a young democracy, Portugal. Building on the very familiar notion that the vote for the incumbent can be predicted on the basis of "economics" and "politics", we capture "economics" through a nonlinear specification of economic growth. Furthermore, we include two structural features of Portuguese politics, which have entailed a systematic electoral punishment for the centre-left Socialist Party as the incumbent and for all incumbents involved in political conflicts with the elected president in Portugal's semi-presidentialism.Forecasting; Portuguese general elections; Economics and elections; Semi-Presidentialism
Referendum Design, Quorum Rules and Turnout
In this article, we focus on the consequences of quorum requirements for turnout in referendums. We use a rational choice, decision theoretic voting model to demonstrate that participation quorums change the incentives some electors face, inducing those who oppose changes in the status quo and expect to be in the minority to abstain. As a result, paradoxically, participation quorums decrease electoral participation. We test our model’s predictions using data for all referendums held in current European Union countries from 1970 until 2007, and show that the existence of a participation quorums increases abstention by more than ten percentage points.Referendum Design; Voter turnout
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