A5008118949- Image and Video Quality Assessment
- Software-Defined Networks and 5G
- Network Traffic and Congestion Control
- Caching and Content Delivery
- Video Coding and Compression Technologies
- Advanced Data Compression Techniques
- Cloud Computing and Resource Management
- Network Security and Intrusion Detection
- Libraries and Information Services
- Interconnection Networks and Systems
- IoT and Edge/Fog Computing
- Image Processing and 3D Reconstruction
- Advanced Optical Network Technologies
- Green IT and Sustainability
- Software System Performance and Reliability
- Archaeological Research and Protection
- Advanced Memory and Neural Computing
- Digital and Traditional Archives Management
- Multimedia Communication and Technology
- Distributed systems and fault tolerance
- Digital Rights Management and Security
- Network Packet Processing and Optimization
- Library Science and Information Systems
- Handwritten Text Recognition Techniques
Staatsarchiv des Kantons Zürich
2020-2023
Technical University of Munich
2014-2020
Swiss Social Archives
2019
University of Würzburg
2013-2015
HTTP Adaptive Streaming (HAS) is employed by more and video streaming services in the Internet. It allows to adapt downloaded quality current network conditions, thus, avoids stalling (i.e., playback interruptions) greatest possible extend. The adaptation of streams done switching between different representation levels, which influences user perceived stream. In this work, influence several parameters, namely, switch amplitude level difference), frequency, recency effects, on Quality...
Purpose An overview of the current use handwritten text recognition (HTR) on archival manuscript material, as provided by EU H2020 funded Transkribus platform. It explains HTR, demonstrates , gives examples cases, highlights affect HTR may have scholarship, and evidences this turning point advanced digitised heritage content. The paper aims to discuss these issues. Design/methodology/approach This adopts a case study approach, using development delivery one openly available platform for...
HTTP Adaptive Streaming (HAS) adapts the video quality to current network condition by switching between different layers. As HAS was shown perform better than classical streaming, it is becoming increasingly popular. Recent research showed that switch amplitude and time on layer have an impact Quality of Experience (QoE) HAS. However, those studies focused only adaptation two layers so far. This work extends these findings taking three into account. Thereby, especially intermediate user...
Video content and, in particular, YouTube's account for the largest amount of today's Internet traffic. However, little is known about behavior video streaming services different kinds network environments and under varying conditions. Due to operators' lack knowledge transmitted content, resources may not be optimally used general. Thus, we propose a dyadic measurement system composed application, i.e., client-based network-based monitoring Using our proposed methodology, analyze HTTP-based...
In this paper, we demonstrate an implementation of a Network Services Abstraction Layer (NSAL) on top the network control and management plane. Furthermore, introduce unified data model for both Software Defined Networking (SDN) legacy devices that allows managing configuring networks in way order to achieve Quality Service (QoS) time-critical tasks (e.g. VoIP). Due model, operators are able manage their through one interface. We use case by implementing VoIP scheduling application NSAL...
Internet traffic reports show that YouTube is one of the major sources data world-wide. Furthermore, shifts from mostly fixed landlines to cellular connections where bandwidth sparse and expensive. Previous studies revealed uses a user-friendly HTTP Adaptive Streaming (HAS) strategy which sacrifices efficiency increase average playback quality for user. That way, it happens same video segment transmitted in two or more levels, but only can be shown We denote this as redundant work dedicated...
Network Functions Virtualization (NFV) aims to move network functions away from expensive hardware appliances off-the-shelf server hardware. NFV promises higher flexibility and cost reduction for the operator. In order achieve high throughput performance with this commodity hardware, fast packet processing frameworks like NetMap or Data Plane Development Kit (DPDK) can be used. It is known that very sensitive regarding copying of packets. paper we take steps towards quantifying efficiency...
Software-defined Networking (SDN) and one of its most known realization, namely OpenFlow, enabled wide-spread vendor-neutral programmability the control plane modern network equipment. However, despite research standardization efforts, management is still eluding device-neutral programmability. Thus, innovation in hampered by a dependency on human experts, domain knowledge that hidden human-centered manuals, huge amount diverse device capabilities configuration interfaces. Recent proposals...
The visualization of Software-Defined Networks (SDN) allows multiple tenants to share the same physical infrastructure and use their own SDN controllers. virtualization is achieved through an network hypervisor that operates between tenants' controllers infrastructure. In order provide performance guarantees, resource mapping required for both data plane as well control each virtual network. context virtualization, resources include hypervisor, which needs be assigned guarantee tenant....
Software-defined networking (SDN) introduces a split between the forwarding plane and control of modern network equipment. Furthermore, OpenFlow, as an open interface for SDN, fosters development logically centralized operation systems (NOS). To allow multiple accessing same network, there is concept SDN hypervisors. Little known about performance characteristics lack scalable realistic hypervisor benchmark tools capable emulating dynamic load scenarios. In this paper, we present extensible...
YouTube, as one of the major HTTP Adaptive Streaming video services, accounts for a large fraction today's Internet traffic. Therefore, it is important to understand how efficiently YouTube uses available network resources. Previous work observed that player replaces previously buffered segments with higher quality segments. This good user increases average level. However, lower level are discarded and their traffic redundant therefore wasted. In this paper, we use two independent approaches...
Video streaming has established itself as the main method to consume multimedia content on Internet. The most widespread technique is HTTP Adaptive Streaming which used by large video service platforms such YouTube and Netflix. In order guarantee a high QoE, different adaptation strategies have been developed that lead playout patterns. While some may be more aggressive than others often adapt quality, it not clear strategy best.,,In this paper, we want identify trade-off between average...
HTTP Adaptive Streaming (HAS) is the de-facto standard for video delivery over Internet. It enables dynamic adaptation of quality by splitting a into small segments and providing multiple levels per segment. So far, HAS services typically utilize fixed segment duration. This reduces encoding streaming variability thus allows faster content reduced prediction complexity adaptive bit rate algorithms. Due to content-agnostic placement I-frames at beginning each segment, additional overhead...
HTTP Adaptive Streaming (HAS) is the de-facto standard for video delivery over Internet. It enables dynamic adaptation of quality by splitting clip into small segments and providing multiple levels per segment. Current HAS streaming services typically utilize equal durations. However, this leads to encoding overhead as have start with I -frames, independently encoded content. In paper we evaluate prospects variable segment durations, where are aligned characteristics. We reduction...
Network Function Virtualization (NFV) aims to virtualize compute resources for packet processing in order gain flexibility and reduce costs. In increase the resource utilization, multiple VNFs are co-located on one single server. Current virtualization techniques do not fully isolate all resources, thus co-location of causes interference effects. It has been shown that these effects can degrade performance Virtualized Functions (VNFs) terms throughput delay severely. this work we aim gather...
Software-Defined Networking (SDN) enables fast reconfiguration of the network based on decisions a logically centralized controller. While SDN is in transition from laboratories and greenfield data-centers to enterprise networks, need for managing partial deployments arises. This incremental deployment has its own set challenges, example design mixed control plane or integration existing management systems. In this paper we focus different speed between legacy devices how those differences...
Providing scalable user- and application-aware resource allocation for heterogeneous applications sharing an enterprise network is still unresolved problem. The main challenges are as follows: (i) How do we define shares of resources? (ii) determine resources to applications? (iii) allocate the per application in networks at scale? In this article, propose solutions three introduce a system design deployment. Defining necessary hard, intended use case, user’s environment, e.g., big or small...
HTTP Adaptive Streaming (HAS) is the de-facto standard for over-the-top (OTT) video streaming services. It allows to react fluctuating network conditions on short time scales by adapting bit rate in order avoid stalling of playback. With HAS content split into small segments a few seconds playtime each, which are available different rates, i.e., quality level representations. Depending current conditions, adaptation algorithm client side chooses appropriate and downloads respective segment....
Zusammenfassung Der Beitrag zeigt auf, wie in den letzten Jahren auf Initiative verschiedener Stakeholder eine selbsttragende, kollaborativ organisierte Infrastruktur für digitale wissenschaftliche Texteditionen aufgebaut wurde, die Prinzipien von Standardisierung und Nachhaltigkeit verpflichtet ist. Eine wachsende Zahl Institutionen Projekten nutzt das Angebot, am Beispiel des Staatsarchivs Kantons Zürich aufgezeigt wird. Thematisiert wird auch Kostenfrage.