1,027 research outputs found
Erratum: “Setup for meV-resolution inelastic X-ray scattering measurements and X-ray diffraction at the Matter in Extreme Conditions endstation at the Linac Coherent Light Source” (Review Of Scientific Instruments (2018) 89 (10F104) DOI: 10.1063/1.5039329)
No full textIn the original paper1 the co-author E. J. Gamboa was erroneously omitted. The corrected author list is identical to that of this erratum, and repeated below for clarity: E. E. McBride,1,2,a) T. G. White,3 A. Descamps,1,4 L. B. Fletcher,1 K. Appel,2 F. Condamine,5,6 C. B. Curry,1,7 F. Dallari,8 S. Funk,9 E. Galtier,1 E. J. Gamboa,1 M. Gauthier,1 S. Goede,2 J. B. Kim,1 H. J. Lee,1 B. K. Ofori-Okai,1,10 M. Oliver,11 A. Rigby,11 C. Schoenwaelder,1,9, P. Sun,1 Th. Tschentscher,2 B. B. L. Witte,1,12 U. Zastrau,2 G. Gregori,11 B. Nagler,1 J. Hastings,1 S. H. Glenzer,1 and G. Monaco8 1 SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA 2 European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany 3 University of Nevada at Reno, Reno, Nevada 89506, USA 4 Department of Aeronautics and Astronautics, Stanford University, Stanford, California 94305, USA 5 Sorbonne Universits, UPMC, LULI, UMR 7605, Case 128, 4 Place Jussieu, 75252 Paris Cedex 05, France 6 LULI, Ecole Polytechnique, CEA-CNRS-UPS, 91228 Palaiseau, France 7 Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada 8 Dipartimento di Fisica, Universit`a di Trento, via Sommarive 14, 38123 Povo, TN, Italy 9 Friedrich-Alexander-Universitat Erlangen-N ̈urnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, D-91058 Erlangen, Germany 10 Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA 11 Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom 12 Universit ̈at Rostock, Institut f ̈ur Physik, D-18051 Rostock, Germany
Current Status Censoring Models: Smooth estimators and their asymptotic properties
No full textStatistics deals with answering questions based on collected data. In medical applications, the quantity of interest can often not be observed directly. They are censored. It is a challenge to answer the question as precisely as possible based on the incomplete data. The quantity of interest can be censored in many different ways. In HIV vaccine trials, censoring results in “current status continuous mark” data. This is a very specific type of censoring and the method of maximum likelihood that usually works very well does not work in this case. Hence, alternative methods are needed. In this thesis, different alternative methods are introduced and studied from different perspectives.Statistics and ProbabilityElectrical Engineering, Mathematics and Computer Scienc
Het ontwerp van een optisch draadloos zendsysteem met witte leds
No full textIn dit ontwerprapport wordt een systeem ontworpen dat via ledverlichting in een warenhuis elektronische prijskaartjes aanstuurt. De informatie die op het display van elk kaartje moet verschijnen, wordt onzichtbaar voor het oog gecodeerd in het uitgestuurde licht. Het ontwerp bestaat uit een enkele zender, namelijk de ledverlichting van een warenhuis, die uniform en simultaan dezelfde informatie uitzendt, en meervoudige ontvangers, namelijk alle prijskaartjes die informatie op het display afbeelden die uniek is per prijskaartje. In deze thesis wordt de zenderkant van het systeem ontworpen, die bestaat uit een centrale terminal vanwaar de data worden verstuurd naar een Power Line Carrier Modem (PLCM) die de data superponeert op het lichtnet. Bij de aansluitklemmen van de verlichting worden de data met een tweede PLCM van het lichtnet gehaald en gebruikt om een elektronische schakeling aan te sturen die de ledverlichting van stroom voorziet.MicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
On Hamiltonian circuits in Cayley diagrams
No full textAbstractLet S generate the group G. The Cayley diagram of the generators S in G is a directed graph denoted by Cay(S). In this paper, we study the existence of hamiltonian paths and circuits in Cay(S). In particular, we give sufficient conditions for the group G to have the property that for every set S generating G, there is a hamiltonian circuit in Cay(S). Two new conjectures are presented. Many questions are still open
Network-Decentralized Simultaneous Localization and Mapping by Multi-Agent Systems
No full textMulti-Agent Systems (MAS) can be used in the exploration and mapping of unknown environments. To cooperate autonomously, each agent of the MAS must know its own location precisely within such an environment. Simultaneous Localization and Mapping (SLAM) techniques are commonly used when the Global Positioning System (GPS) is unavailable or does not provide sufficient accuracy in positioning the agents. In multi-robot SLAM additional challenges, related to data sharing, arise as the number of robots increases. These additional challenges prevent the multi-robot SLAM solutions to be scaled easily. Network-decentralized state estimation can be used to overcome this problem. The information sharing within multi-agent systems can be modelled based on the topology of a graph. The agents form the nodes and communication is only along the edges of this network. Network-decentralized state estimation consists of designing local state observers for a network of agents to asymptotically estimate their own state based on information exchanges with neighboring agents only. In this thesis, the concepts of network-decentralized position estimation and SLAM are combined to form a novel network-decentralized SLAM which can be used by a multi-agent system in unknown environments to build a map of the surroundings. The network-decentralized SLAM is simulated in MATLAB and evaluated based on different metrics. A volume error metric as well as different timing metrics are introduced. Based on the evaluation of these metrics, it is shown that the proposed network-decentralized SLAM can be easily scaled to larger formations to cover unknown areas faster and in a more robust and accurate way.Electrical Engineering | Embedded System
Communications and Transport: The mobility of information, people and commodities
No full textIn a context where the study of communications tends to focus only on the mobility of information, to the neglect of that of people and commodities, this article explores the potential for a closer integration between the fields of communications and transport studies. Against the presumption that the emergence of virtuality means that material geographies are no longer of consequence, the role of mediated ‘technologies of distance’ is considered here in the broader contexts of the construction (and regulation) of a variety of physical forms of mobility and the changing modes of articulation of the virtual and material worlds
Extreme ultraviolet lensless imaging without object support through rotational diversity in diffractive shearing interferometry
No full textWe report on a method that allows microscopic image reconstruction from extreme-ultraviolet diffraction patterns without the need for object support constraints or other prior knowledge about the object structure. This is achieved by introducing additional diversity through rotation of an object in a rotationally asymmetric probe beam, produced by the spatial interference between two phase-coherent high-harmonic beams. With this rotational diffractive shearing interferometry method, we demonstrate robust image reconstruction of microscopic objects at wavelengths around 30 nm, using images recorded at only three to five different object rotations.ImPhys/Optic
Application-specific instruction-set processor for Retinex-like image and video processing
No full textThis brief presents an application-specific instruction-set processor (ASIP) for real-time Retinex image and video filtering. Design optimizations are addressed at algorithmic and architectural levels, the latter including a dedicated memory structure, an adapted pipeline, bypasses, a custom address generator and special looping structures. Synthesized in CMOS technology, the ASIP stands for its better energy-flexibility tradeoff versus reference ASIC and digital signal processing Retinex implementations
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