43,716 research outputs found
Francisco Salva's Electric Telegraph
This article takes a look at the life and accomplishments of Francisco Salva of Spain, including his work with an electric telegraph system. The author states that information herein is based on the original report and some practical demonstrations that Salva presented to the Barcelona Academy of Sciences in 1804
A remark on approximation with polynomials and greedy bases
We investigate properties of the -th error of approximation by polynomials
with constant coefficients and with modulus-constant
coefficients introduced by Bern\'a and Blasco
(2016) to study greedy bases in Banach spaces. We characterize when
and are
equivalent to in terms of the democracy and superdemocracy functions,
and provide sufficient conditions ensuring that , extending previous very particular
results
Admissibility condition for exceptional Laguerre polynomials
We prove a necessary and sufficient condition for the integrability of the
weight associated to the exceptional Laguerre polynomials. This condition is
very much related to the fact that the associated second order differential
operator has no singularities in .Comment: 12 page
Multi-Party Coordination in the Context of MOWS
Separation of concerns has been presented as a promising tool to tackle the design of complex systems
in which cross-cutting properties that do not fit into the scope of a class must be satisfied. In this paper,
we show that interactions amongst a number of objects can also be described separately from functionality,
which enhances reusability of functional code and interaction patterns. We present our proposal in the context
of Multi-Qrganisational Web-Based Systems (MOWS) and also present a framework that provides the infrastructure
needed to implement multiparty coordination as an independent aspect
Aspect-oriented interaction in multi-organisational web-based systems
Separation of concerns has been presented as a promising tool to tackle the design of complex systems in which
cross-cutting properties that do not fit into the scope of a class must be satisfied. Unfortunately, current proposals
assume that objects interact by means of object-oriented method calls, which implies that they embed interactions with
others into their functional code. This makes them dependent on this interaction model, and makes it difficult to reuse
them in a context in which another interaction model is more suited, e.g., tuple spaces, multiparty meetings, ports, and
so forth. In this paper, we show that functionality can be described separately from the interaction model used, which
helps enhance reusability of functional code and coordination patterns. Our proposal is innovative in that it is the first
that achieves a clear separation between functionality and interaction in an aspect-oriented manner. In order to show
that it is feasible, we adapted the multiparty interaction model to the context of multiorganisational web-based systems
and developed a class framework to build business objects whose performance rates comparably to handmade implementations;
the development time, however, decreases significantly.Comisión Interministerial de Ciencia y Tecnología TIC2000-1106-C02-0
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