Institution
Alcatel-Lucent
Stuttgart, Germany•
About: Alcatel-Lucent is a based out in Stuttgart, Germany. It is known for research contribution in the topics: Signal & Network packet. The organization has 37003 authors who have published 53332 publications receiving 1430547 citations. The organization is also known as: Alcatel-Lucent S.A. & Alcatel.
Topics: Signal, Network packet, Base station, Optical fiber, Node (networking)
Papers published on a yearly basis
Papers
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08 Dec 1997TL;DR: In this article, an agent vector monitors selected performance parameters of a call center, such as service times, in-queue times, call volumes, call abandonment rates, benefits derived from having different agents handle calls requiring different skills, proportions of work spent by agents on handling calls requiring various skills, etc., and automatically adjusts agents' call-handling assignments.
Abstract: An agent vector monitors selected performance parameters of a call center, such as service times, in-queue times, call volumes, call abandonment rates, benefits derived from having different agents handle calls requiring different skills, proportions of work spent by agents on handling calls requiring different skills, etc., and automatically adjusts agents' call-handling assignments, for example, by changing the skills to which an agent is assigned or by changing the relative priorities of the agent's skills, in order to optimize a predefined objective. The objective is a selected performance characteristic of the call center, for example, the total benefit to the call center of individual ones of the agents handling calls requiring individual agent skills.
332 citations
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TL;DR: In this article, an initial molecular excited state is generated in the host compound by absorption of light; this state is then resonantly and non-radiatively transferred down in energy (through one or more steps) between suitably matched dye molecules, so ensuring that the absorption losses at the final emission wavelengths are very small.
Abstract: There is currently renewed interest in the development of lasers using solid-state organic and polymeric materials as the gain media. These materials have a number of properties that make them good candidates for such applications — for example, emission bands that are displaced (via a Stokes shift) from absorption bands, and the ease with which the emitting species can be embedded in a suitable host material1,2,3,4,5. But despite these advantages, the threshold power densities required for light amplification that have been reported so far have been high6,7,8. Here we describe an approach, based on energy transfer between molecular species, that can lower the threshold for stimulated emission and laser action while improving markedly the waveguiding properties of the active material. In our materials, an initial molecular excited state is generated in the host compound by absorption of light; this state is then resonantly and non-radiatively transferred down in energy (through one or more steps) between suitably matched dye molecules dispersed in the host, so ensuring that the absorption losses at the final emission wavelengths are very small. Such composite gain media provide provide broad tunability of the emission wavelength, and also decouple the optical emission properties from the transport properties, so providing greater flexibility for the design of future electrically driven device structures.
331 citations
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TL;DR: This work considers the problem of clustering dynamic point sets in a metric space and proposes a model called incremental clustering which is based on a careful analysis of the requirements of the information retrieval application, and which should also be useful in other applications.
Abstract: Motivated by applications such as document and image classification in information retrieval, we consider the problem of clustering dynamic point sets in a metric space. We propose a model called incremental clustering which is based on a careful analysis of the requirements of the information retrieval application, and which should also be useful in other applications. The goal is to efficiently maintain clusters of small diameter as new points are inserted. We analyze several natural greedy algorithms and demonstrate that they perform poorly. We propose new deterministic and randomized incremental clustering algorithms which have a provably good performance, and which we believe should also perform well in practice. We complement our positive results with lower bounds on the performance of incremental algorithms. Finally, we consider the dual clustering problem where the clusters are of fixed diameter, and the goal is to minimize the number of clusters.
331 citations
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TL;DR: In this article, the authors report on recent advances made in PEM water electrolysis technology, including low-cost membrane electrode assemblies (MEAs), cell efficiency, operation at high current density, electrochemical performances and gas purity issues during high-pressure operation, safety considerations, stack design and optimization (for electrolyzers which can produce up to 5m 3 H 2 /h) and performance degradations.
330 citations
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TL;DR: Evidence suggests that the long-ranged attraction between particles which causes aggregation is mediated by electric-field-induced fluid flow, and an axially symmetric flow field is imaged around individual particles on a uniform electrode surface.
Abstract: Suspensions of colloidal particles form a variety of ordered planar structures at an interface in response to an a.c. or d.c. electric field applied normal to the interface1–3. This field-induced pattern formation can be useful, for example, in the processing of materials. Here we explore the origin of the ordering phenomenon. We present evidence suggesting that the long-ranged attraction between particles which causes aggregation is mediated by electric-field-induced fluid flow. We have imaged an axially symmetric flow field around individual particles on a uniform electrode surface. The flow is induced by distortions in the applied electric field owing to inhomogeneities in the 'double layer' of ions and counterions at the electrode surface. The beads themselves can create these inhomogeneities, or alternatively, we can modify the electrode surfaces by lithographic patterning so as to introduce specified patterns into the aggregated structures.
329 citations
Authors
Showing all 37011 results
Name | H-index | Papers | Citations |
---|---|---|---|
George M. Whitesides | 240 | 1739 | 269833 |
Yoshua Bengio | 202 | 1033 | 420313 |
John A. Rogers | 177 | 1341 | 127390 |
Zhenan Bao | 169 | 865 | 106571 |
Thomas S. Huang | 146 | 1299 | 101564 |
Federico Capasso | 134 | 1189 | 76957 |
Robert S. Brown | 130 | 1243 | 65822 |
Christos Faloutsos | 127 | 789 | 77746 |
Robert J. Cava | 125 | 1042 | 71819 |
Ramamoorthy Ramesh | 122 | 649 | 67418 |
Yann LeCun | 121 | 369 | 171211 |
Kamil Ugurbil | 120 | 536 | 59053 |
Don Towsley | 119 | 883 | 56671 |
Steven P. DenBaars | 118 | 1366 | 60343 |
Robert E. Tarjan | 114 | 400 | 67305 |