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26. Towards First Urban Data Space in Bulgaria

Author

Vassilev, Vassil, primary, Petrova-Antonova, Dessislava, additional, Bali, Tarun, additional, Radu, Sorin, additional, Sowinski-Mydlarz, Viktor, additional, Mariyanayagam, Dion, additional, Marinov, Evgeny, additional, Hristov, Petar O., additional, Nakarmi, Sabin, additional, and Rabka, Monika, additional

Published
2022
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36. Recent Advances on Magnetically Insulated Line Oscillator (MILO)

Author

Packard, Drew A., primary, Lau, Y. Y., additional, Guerin, Emma N., additional, Swenson, Chris J., additional, Langellotti, Stephen V., additional, Jassem, Abhijit, additional, Li, Dion, additional, Luginsland, John W., additional, Jordan, Nicholas M., additional, McBride, Ryan D., additional, and Gilgenbach, Ronald M., additional

Published
2022
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47. Integration of the Helpdesk System with Messaging Service: A Case Study Approach

Author

Arifah Hidayati, Dewi Khairani, Herdi Hardianto, Imam Subchi, Imam Marzuki Shofi, and Dion Eprijum Ginanto

Subjects
Service (business), Information Technology Infrastructure Library, Process management, Computer science, business.industry, Push technology, Information technology management, Information system, Information technology, Service management, business, Service desk
Abstract

As IT organization handles information systems and technology receives many services request in the field of operational or implementation of systems and information technology, they had to deal with these problems: a simple ticketing service, IT management mechanism in order to provide services to users of the system, to boost the information service which enabled the process with positive influences. This paper proposes a service desk solution integrated with Messaging services, using Short Messaging Services (SMS) and a push notification application. Here we use the WhatsApp application as a notification media to assist the design of the helpdesk. Analysis and adjustment were made to the ITSM concept using the ITIL V4 framework at the Service Management Practices stage. The results of this study are implementing the ITIL V4 framework to get better helpdesk services and utilizing the Messaging services to increase the promptness of sending tickets.

Published
2021

48. Cloud Native Hardware Accelerated 5G virtualized Radio Access Network

Author

Patrick Savelli, Julien Lallet, Jean Dion, Laurent Beaulieu, and Philippe Bertin

Subjects
Radio access network, business.industry, Computer science, Server, Hardware acceleration, Cloud computing, Orchestration (computing), Energy consumption, business, Computer hardware, Edge computing, Efficient energy use
Abstract

Cloud Radio Access Network consists in deporting and pooling radio processing on shared servers for a better use of computing resources, more agile operations, and thus optimizing costs and energy performance. Some of these processes at the radio physical layer are highly demanding in terms of computing power, which implies high energy consumption. Our approach enables the automatic activation of hardware programmable acceleration resources that are better suited to these processes in terms of performance and energy efficiency. Low-Density Parity-Check Forward Error Correction functions standardized in 5th Generation of Mobile Networks are offloaded on these hardware acceleration resources. Kubernetes-based orchestration is made compatible with the use of a edge computing accelerated heterogeneous infrastructure (CPU, GPU, FPGA) that can be distributed at the edge of the operator’s network to deploy the RAN Distributed Unit. We assess the proof-of-concept implementation of our approach and evaluate cost in data offloading and energy consumption. This prefigures a full cloud orchestration for 5G access, such as recommended in the O-RAN consortium.

Published
2021

49. Electromagnetic and Relativistic Corrections to the Ramo-Shockley Theorem

Author

David Chernin, Y.Y. Lau, and Dion Li

Subjects
Wavefront, Physics, Acceleration, Point particle, Quantum electrodynamics, Radiative transfer, Perpendicular, Charge (physics), Electron, Electromagnetic radiation
Abstract

The classical Ramo-Shockley theorem (RS) [1] , [2] gives the current induced on perfect conductors by the motion of nearby charges. It is a foundational result in vacuum electronics, discharge physics, and semiconductor devices. The original theorem was derived by assuming quasi-static fields, ignoring both relativistic and radiative effects. This paper illustrates, for the first time, how relativistic and electromagnetic effects modify RS in some simple examples and examines the magnitude of the corrections. Specifically, we present explicit, closed form analytic solutions of Maxwell’s equations for the induced current distribution on perfectly conducting plates due to the motion of a line charge moving either parallel or perpendicular to the plates. Our exact closed form solutions have been verified by several methods, including particle-in-cell simulations. Several novel features were revealed that are absent in the classical RS: electromagnetic transients due to the sudden acceleration of charge, multiple reflections of electromagnetic waves by conductors, and generation of an electromagnetic shock when the charge strikes a conductor and is subsequently removed. We have found that the classical RS works rather well otherwise, even for a highly relativistic beam, except near the wavefront(s) where the transients dominate. This partially explains the mystery as to why the non-relativistic RS has been very successful in the theory and numerical simulations of vacuum electronic devices, in which only the quasi-static, sinusoidal steady solutions are included. The electromagnetic shock could be a source of contamination on the quality of signals in satellite communication, by the electrons in a multipactor discharge [3] . These issues are being examined. The induced current due to motion of a point charge is also under investigation.

Published
2021

50. A Re-Examination of Brillouin Flow in a Crossed-Field Diode

Author

Y.Y. Lau, Abhijit Jassem, and Dion Li

Subjects
Brillouin zone, Physics, Field (physics), Flow (mathematics), Thermodynamic equilibrium, Scattering, Hull, Magnetic field, Computational physics, Diode
Abstract

The Brillouin flow is widely considered the preferred equilibrium state in a magnetically insulated diode, when the magnetic field, B, exceeds the Hull cutoff magnetic field, BH. The Buneman-Hartree condition for a cylindrical magnetically insulated line oscillator (MILO) was derived, for the first time, using the Brillouin flow model [1] . Recent experiments at the University of Michigan [2] , [3] showed that MILOs tend to operate close to Hull cutoff, i.e., B/BH close to unity. They even showed that MILOs might operate at a current level slightly less than that required at Hull cutoff. The latter is a peculiar property also noted in our recent Brillouin flow theory [1] . Crossed-field flow is known to be particularly difficult to characterize in the transition regime, where B/BH ~ 1 [4] . The presence of a slow wave structure in a MILO thus likely leads to additional uncertainties in the flow characterization. This paper presents our ongoing investigations into the Brillouin flow, using high-fidelity 1D and 2D simulation codes, as well as analytic modeling. Various issues will be addressed.

Published
2021

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