1,499,997 research outputs found
Data processing and online reconstruction
In the upcoming upgrades for Run 3 and 4, the LHC will significantly increase
Pb--Pb and pp interaction rates. This goes along with upgrades of all
experiments, ALICE, ATLAS, CMS, and LHCb, related to both the detectors and the
computing. The online processing farms must employ faster, more efficient
reconstruction algorithms to cope with the increased data rates, and data
compression factors must increase to fit the data in the affordable capacity
for permanent storage. Due to different operating conditions and aims, the
experiments follow different approaches, but there are several common trends
like more extensive online computing and the adoption of hardware accelerators.
This paper gives an overview and compares the data processing approaches and
the online computing farms of the LHC experiments today in Run 2 and for the
upcoming LHC Run 3 and 4.Comment: 6 pages, 0 figures, contribution to LHCP2018 conferenc
Online Personal Data Processing and EU Data Protection Reform. CEPS Task Force Report, April 2013
This report sheds light on the fundamental questions and underlying tensions between current policy objectives, compliance strategies and global trends in online personal data processing, assessing the existing and future framework in terms of effective regulation and public policy. Based on the discussions among the members of the CEPS Digital Forum and independent research carried out by the rapporteurs, policy conclusions are derived with the aim of making EU data protection policy more fit for purpose in today’s online technological context. This report constructively engages with the EU data protection framework, but does not provide a textual analysis of the EU data protection reform proposal as such
Data Workflow - A Workflow Model for Continuous Data Processing
Online data or streaming data are getting more and more important for enterprise information systems, e.g. by integrating sensor data and workflows. The continuous flow of data provided e.g. by sensors requires new workflow models addressing the data perspective of these applications, since continuous data is potentially infinite while business process instances are always finite.\ud
In this paper a formal workflow model is proposed with data driven coordination and explicating properties of the continuous data processing. These properties can be used to optimize data workflows, i.e., reducing the computational power for processing the workflows in an engine by reusing intermediate processing results in several workflows
Fast TPC Online Tracking on GPUs and Asynchronous Data Processing in the ALICE HLT to facilitate Online Calibration
ALICE (A Large Heavy Ion Experiment) is one of the four major experiments at
the Large Hadron Collider (LHC) at CERN, which is today the most powerful
particle accelerator worldwide. The High Level Trigger (HLT) is an online
compute farm of about 200 nodes, which reconstructs events measured by the
ALICE detector in real-time. The HLT uses a custom online data-transport
framework to distribute data and workload among the compute nodes. ALICE
employs several calibration-sensitive subdetectors, e.g. the TPC (Time
Projection Chamber). For a precise reconstruction, the HLT has to perform the
calibration online. Online-calibration can make certain Offline calibration
steps obsolete and can thus speed up Offline analysis. Looking forward to ALICE
Run III starting in 2020, online calibration becomes a necessity. The main
detector used for track reconstruction is the TPC. Reconstructing the
trajectories in the TPC is the most compute-intense step during event
reconstruction. Therefore, a fast tracking implementation is of great
importance. Reconstructed TPC tracks build the basis for the calibration making
a fast online-tracking mandatory. We present several components developed for
the ALICE High Level Trigger to perform fast event reconstruction and to
provide features required for online calibration. As first topic, we present
our TPC tracker, which employs GPUs to speed up the processing, and which bases
on a Cellular Automaton and on the Kalman filter. Our TPC tracking algorithm
has been successfully used in 2011 and 2012 in the lead-lead and the
proton-lead runs. We have improved it to leverage features of newer GPUs and we
have ported it to support OpenCL, CUDA, and CPUs with a single common source
code. This makes us vendor independent. As second topic, we present framework
extensions required for online calibration. ...Comment: 8 pages, 6 figures, contribution to CHEP 2015 conferenc
Remote controlled partial discharge acquisition unit
Online partial discharge (PD) analysis for underground high voltage cables has major advantages over the offline techniques. Online techniques usually involve PD data acquisition, storage and post-processing of the data. However, the data acquisition process can be time consuming and troublesome because of design procedures and protocols required before commencement of data acquisition. This paper presents a robust remote controlled partial discharge acquisition unit for underground high voltage cable networks. This system is uniquely designed to incorporate the difficulties of accessibility, especially for remotely located substations. Real field data from a 33kV network is included in the paper
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