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Satellite Communications Integration with Terrestrial Networks

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China Communications 2018年第8期15卷 22-38页

作者： Adam Kapovits Marius-lulian Corici Ilie-Daniel Gheorghe-Pop Anastasius Gavras Frank Burkhardt Thomas Schlichter Stefan Covaci Eurescom GmbH Heidelberg 69123Germany fraunhofer institute for Open Communication Systems FOKUS Berlin 10589Germany fraunhofer institute for integrated circuits iis Erlangen 91058Germany Technische Universitat Berlin Berlin 10623Germany

In this paper we evaluate the feasibility of seamless and efficient integration of terrestrial communication systems with satellite networks. This aspect is considered by standardisation bodies such as ETSI [1], 5 G-PPP [2] and 3 GPP [3]. A comprehensive system is designed and implemented in an emulation prototype, including standard 3 GPP LTE core network functionality [4] with its different layers: networking, data forwarding, control, management and monitoring and is validated through performance measurements. This work is a technical feasibility study of extending terrestrial communication systems with satellite networks as backhaul, increasing the energy efficiency, network robustness during natural disasters as well as being an alternative for peak-time data forwarding of the terrestrial communication services. Due to its global coverage property, terrestrial-satellite integration provides an obvious extension of communication services towards isolated and remote areas and an alternative for rural or highly distributed/highly mobile enterprise networks.

关键词：卫星通讯网络评估陆上集成通讯系统 3GPP 通讯服务 ETSI

Semiautomated 3D Root Segmentation and Evaluation Based on X-Ray CT Imagery

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Plant Phenomics 2021年第1期3卷 86-98页

作者： Stefan Gerth Joelle Claußen Anja Eggert Norbert Wörlein Michael Waininger Thomas Wittenberg Norman Uhlmann Development Center X-Ray Technology(EZRT) Fraunhofer Institute for Integrated Systems(IIS)Flugplatzstraße 7590768 FürthGermany Biomedical Engineering Department Fraunhofer Institute for Integrated Systems(IIS)Am Wolfsmantel 331191058 ErlangenGermany

*** X-ray tomography(CTX)is a high-end nondestructive approach for the visual assessment of root architecture in ***,in order to evaluate high-resolution CTX data of root architectures,manual segmentation of the depicted root systems from large-scale volume data is currently necessary,which is both time consuming and error *** duration of such a segmentation is of importance,especially for time-resolved growth analysis,where several instances of a plant need to be segmented and ***,in our application,the contrast between soil and root data varies due to different growth stages and watering situations at the time of ***,the root system itself is expanding in length and in the diameter of individual *** semiautomated and robust root system segmentation from CTX data,we propose the RootForce approach,which is an extension of Frangi’s“multi-scale vesselness”method and integrates a 3D local *** allows a precise delineation of roots with diameters down to severalμm in pots with varying ***,RootForce is not limited to the segmentation of small below-ground organs,but is also able to handle storage roots with a diameter larger than 40 *** CTX volume data of full-grown bean plants as well as time-resolved(3D+time)growth studies of cassava plants,RootForce produces similar(and much faster)results compared to manual segmentation of the regarded root ***,RootForce enables the user to obtain traits not possible to be calculated before,such as total root volume(Vroot),total root length(Lroot),root volume over depth,root growth angles(θmin,θmean,andθmax),root surrounding soil density Dsoil,or form fraction *** proposed RootForce tool can provide a higher efficiency for the semiautomatic high-throughput assessment of the root architectures of different types of plants from large-scale ***,for all datasets

关键词： automated handle Root

MPEG-H电视音频系统及国际标准化发展(Ⅰ)

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数字通信世界 2017年第7期 40-42页

作者： Stefan Meltzer Max Neuendorf Jan Plogsties Robert Bleidt fraunhofer institute for integrated circuits(iis)

目前,下一代广播电视标准成为了全球广播电视领域热议的话题。而沉浸式、互动式等技术特点成为了未来广播电视标准中能够为用户带来更高价值的核心竞争力。本文重点介绍了被ATSC 3.0成功采纳,并成为其最终标准的下一代广播电视音频标准:... 详细信息

目前,下一代广播电视标准成为了全球广播电视领域热议的话题。而沉浸式、互动式等技术特点成为了未来广播电视标准中能够为用户带来更高价值的核心竞争力。本文重点介绍了被ATSC 3.0成功采纳,并成为其最终标准的下一代广播电视音频标准:MPEG-H电视音频系统,并主要介绍了其技术特征以及其在下一代广播电视标准应用中的核心性能。同时,还详细地阐述了MPEG-H在ATSC 3.0标准展过程中的大事记,以及对下一代电视音频标准商业推广的相关思考。

关键词： MPEG-H电视音频 3D音频沉浸式声音互动式声音

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MPEG-H电视音频系统及国际标准化发展

信息技术与标准化 2017年第6期 54-57页

作者： Stefan Meltzer Max Neuendorf Jan Plogsties Robert Bleidt fraunhofer institute for integrated circuits(iis)

重点介绍了被ATSC 3.0采纳并成为其最终标准的下一代广播电视音频标准——MPEG-H电视音频系统,阐述该标准的技术特征及其在下一代广播电视标准应用中的核心性能;阐述MPEG-H在ATSC 3.0标准发展过程中的大事记,以及对下一代电视音频标准... 详细信息

重点介绍了被ATSC 3.0采纳并成为其最终标准的下一代广播电视音频标准——MPEG-H电视音频系统,阐述该标准的技术特征及其在下一代广播电视标准应用中的核心性能;阐述MPEG-H在ATSC 3.0标准发展过程中的大事记,以及对下一代电视音频标准商业推广的相关思考。

关键词： MPEG-H电视音频 3D音频沉浸式声音互动式声音

Near-field launching and mapping unidirectional surface plasmon polaritons using an automated dual-tip scanning near-field optical microscope

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Photonics Research 2022年第11期10卷 2628-2641页

作者： NAJMEH ABBASIRAD ANGELA BARREDA YI-JU CHEN JER-SHING HUANG ISABELLE STAUDE FRANK SETZPFANDT THOMAS PERTSCH institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University Jena07745 JenaGermany institute of Solid State Physics Friedrich Schiller University Jena07743 JenaGermany Research Department of Nanooptics Leibniz Institute of Photonic Technology07745 JenaGermany fraunhofer-institute for Applied Optics and Precision Engineering IOF 07745 JenaGermany

The spatial distribution of electromagnetic fields emitted from the aperture tip of a scanning near-field optical microscope(SNOM), which is called the emission pattern, depends on the geometry of the apex and the material composition of the tip’s coating. In previous works, experimental measurements of the emission pattern from the aperture tip were performed mostly in the far field. Moreover, the corresponding theoretical models were also developed based on these far-field measurements. Here, we have used the automated dual-tip SNOM to systematically characterize the emission from the aperture tip in the near field. In this regard, we have considered three different pairs of excitation and detection tips with distinct geometries. The emission patterns of the excitation tips were mapped using detection tips. Unidirectional surface plasmon polaritons(SPPs) at the surface of a gold platelet were launched by an excitation tip and measured in the near field by the detection tip. The experimental results were numerically reproduced by means of the Bethe–Bouwkamp model. This work puts into evidence the applicability of the automated dual-tip SNOM as the only available characterization technique to measure the emission from aperture tips in the near field. The reported asymmetric SPP radiation patterns can find applications in photonic integrated circuits or in biological and chemical sensing.

关键词： optical excitation field

Nonlinear quantum spectroscopy with parity-time-symmetric integrated circuits

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Photonics Research 2022年第7期10卷 1763-1776页

作者： PAWAN KUMAR SINA SARAVI THOMAS PERTSCH FRANK SETZPFANDT ANDREY A.SUKHORUKOV institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University Jena07745 JenaGermany fraunhofer institute for Applied Optics and Precision Engineering 07745 JenaGermany Research School of Physics Australian National UniversityCanberraACT 2601Australia ARC Centre of Excellence for Transformative Meta-Optical Systems(TMOS) Australia

We propose a novel quantum nonlinear interferometer design that incorporates a passive parity-time(PT)-symmetric coupler sandwiched between two nonlinear sections where signal-idler photon pairs are *** PT symmetry enables efficient coupling of the longer-wavelength idler photons and facilitates the sensing of losses in the second waveguide exposed to analyte under investigation,whose absorption can be inferred by measuring only the signal intensity at a shorter wavelength where efficient detectors are readily ***,we identify a new phenomenon of sharp signal intensity fringe shift at critical idler loss values,which is distinct from the previously studied PT symmetry *** discuss how such unconventional properties arising from quantum interference can provide a route to enhancing the sensing of analytes and facilitate broadband spectroscopy applications in integrated photonic platforms.

关键词： interferometer waveguide quantum

Superconducting single-photon detectors integrated with diamond nanophotonic circuits

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Light(Science & Applications) 2015年第1期4卷 171-178页

作者： Patrik Rath Oliver Kahl Simone Ferrari Fabian Sproll Georgia Lewes-Malandrakis Dietmar Brink Konstantin Ilin Michael Siegel Christoph Nebel Wolfram Pernice institute of Nanotechnology Karlsruhe Institute of Technology76021 KarlsruheGermany institute of Micro-and Nanoelectronic Systems Karlsruhe Institute of Technology76187 KarlsruheGermany fraunhofer institute for Applied Solid State Physics Tullastr.7279108 FreiburgGermany

Photonic quantum technologies hold promise to repeat the success of integrated nanophotonic circuits in non-classical *** linear optical elements,quantum optical computations can be performed with integrated optical circuits and can therefore overcome the existing limitations in terms of *** addition to passive optical devices for realizing photonic quantum gates,active elements,such as single-photon sources and single-photon detectors,are essential ingredients for future optical quantum *** systems that allow for the monolithic integration of all components are particularly attractive,including III-V semiconductors,silicon and ***,we demonstrate nanophotonic integrated circuits made from high-quality polycrystalline diamond thin films in combination with on-chip single-photon *** using superconducting nanowires that are coupled evanescently to traveling waves,we achieve high detection efficiencies of up to 66%as well as low dark count rates and a timing resolution of 190 *** devices are fully scalable and hold promise for functional diamond photonic quantum devices.

关键词： diamond nanophotonics integrated optics superconducting single-photon detectors

LOW BITRATE AUDIO CODING - STATE-OF-THE-ART,CHALLENGES AND FUTURE DIRECTIONS

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LOW BITRATE AUDIO CODING - STATE-OF-THE-ART,CHALLENGES AND F...

LOW BITRATE AUDIO CODING-STATE-OF-THE-ART,CHALLENGES AND FUTURE DIRECTIONS

2000年第16届世界计算机大会

作者： Karlheinz Brandenburg Ilmenau Technical University ＆ fraunhofer iis Arbeitsgruppe Elektronische Medientechnologie Ilmenau Germany

＜正＞Perceptual encoding of high quality audio has found its way to many applications including digital radio,Electronic Music Distribution（EMD） systems and portable audio *** overview on the basics of high quality low bitrate audio coding will be followed by a look into currently widely used and newer, state-of-the-art coding systems like MP3 and MPEG-2 Advanced Audio Coding（AAC）.The rapid deployment of older （1992） technologies（like MP3） followed by the news of new and improved algorithms（like AAC） raises the question about future *** paper will analyse some candidates for such improvements and provide a view of some current research activities.

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LOW BITRATE AUDIO CODING-STATE-OF-THE-ART,CHALLENGES AND FUT...