166,670 research outputs found
Report of the Third General Meeting of the International Network for Development Information Exchange (INDIX)
Meeting: International Network for Development Information Exchange, General Meeting, 3d, 13-15 Sept. 1995, Koebenhavn, D
On the energetics of information exchange
We consider the thermodynamic properties of systems in contact with an
information source and focus on the consequences of energetic cost associated
with the exchange of information. To this end we introduce the model of a
thermal tape and derive a general bound for the efficiency of work extraction
for systems in contact with such a tape. Depending on the perspective, the
correlations between system and tape may either increase or reduce the
efficiency of the device. We illustrate our general results with two exactly
solvable models, one being an autonomous system, the other one involving
measurement and feedback. We also define an ideal tape limit in which our
findings reduce to known results.Comment: 6 pages, 6 figure
Network coding for undirected information exchange
We consider the information exchange problem where each in a set of terminals transmits information to all other terminals in the set, over an undirected network. We show that the design of only a single network code for multicasting is sufficient to achieve an arbitrary point in the achievable rate region. We also provide an alternative proof for the set of achievable rate tuples
Patterns for service-oriented information exchange requirements
Service-Oriented Computing (SOC) is an emerging computing paradigm that supports loosely-coupled inter-enterprise interactions. SOC interactions are predominantly specified in a procedural manner that defines message sequences intermixing implementation with business requirements. In this paper we present a set of patterns concerning requirements of information exchange between participants engaging in service-oriented interactions. The patterns aim at explicating and elaborating the business requirements driving the interaction and separating them from implementation concerns
Equilibration through local information exchange in networks
We study the equilibrium states of energy functions involving a large set of
real variables, defined on the links of sparsely connected networks, and
interacting at the network nodes, using the cavity and replica methods. When
applied to the representative problem of network resource allocation, an
efficient distributed algorithm is devised, with simulations showing full
agreement with theory. Scaling properties with the network connectivity and the
resource availability are found.Comment: v1: 7 pages, 1 figure, v2: 4 pages, 2 figures, simplified analysis
and more organized results, v3: minor change
Information Exchange Limits in Cooperative MIMO Networks
Concurrent presence of inter-cell and intra-cell interferences constitutes a
major impediment to reliable downlink transmission in multi-cell multiuser
networks. Harnessing such interferences largely hinges on two levels of
information exchange in the network: one from the users to the base-stations
(feedback) and the other one among the base-stations (cooperation). We
demonstrate that exchanging a finite number of bits across the network, in the
form of feedback and cooperation, is adequate for achieving the optimal
capacity scaling. We also show that the average level of information exchange
is independent of the number of users in the network. This level of information
exchange is considerably less than that required by the existing coordination
strategies which necessitate exchanging infinite bits across the network for
achieving the optimal sum-rate capacity scaling. The results provided rely on a
constructive proof.Comment: 35 pages, 5 figur
Nonclassicality and information exchange in deterministic entanglement formation
We discuss the role of nonclassicality of quantum states as a necessary
resource in deterministic generation of multipartite entangled states. In
particular for three bilinearly coupled modes of the electromagnetic field,
tuning of the coupling constants between the parties allows the total system to
evolve into both Bell and GHZ states only when one of the parties is initially
prepared in a nonclassical state. A superposition resource is then converted
into an entanglement resource.Comment: Replaced by the accepted version. Two optical implementations of the
quantum resource conversion protocol are now proposed. To appear in Phys.
Lett. A. 7 pages, 1 figur
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