Search results for "NETWORKING"

Demo abstract: Cross-technology TDMA synchronization using energy pattern beacons

2017

When different technologies use the same frequency bands in close proximity, the resulting interference typically results in performance degradation. Coexistence methods exist, but these are often technology specific and require technology specific interference detection methods. To remove the root cause of the performance degradation, devices should be able to negotiate medium access even when using different technologies. To this end, an architecture that allows cross-technology medium access by means of a Time Division Multiple Access (TDMA) scheme was devised. In order to achieve cross-technology synchronization, which is required for the TDMA solution, an energy pattern beacon is trans…

Distributed GNSS-Based Time Synchronization and Applications

2016

The paper deals with synchronization standards, applications and challenges in the modern packet switched telecommunication networks. In recent years, the number of time-dependent services and systems only increases with the development of such areas as Internet of Things (IoT), industrial Internet, remote automation and robotics, precise positioning etc. In the paper, these emerging applications are discussed. An alternative way to the traditional centralized synchronization infrastructure is proposed. Compact and low-priced devices equipped with a Global Navigation Satellite System (GNSS) receiver and a reliable internal clock can be installed specifically in the places where they are nee…

Level-Crossing Rate and Average Duration of Fades in Non-Isotropic Hoyt Fading Channels with Applications to Selection Combining Diversity

2015

In this paper, we investigate the second-order statistics of Hoyt fading channels under non isotropic scattering scenarios. Assuming an asymmetrical Doppler power spectral density (PSD), we derive, in the form of single finite-range integrals, expressions for the level-crossing rate (LCR) and average duration of fades (ADF). These new results are then applied to obtain the LCR and ADF of selection combining (SC) diversity over non-isotropic Hoyt channels. In addition to their importance for studying the system performance and characterizing the dynamic behavior of multipath fading channels, the formulas derived are general in that they can be applied to many non-isotropic scattering situati…

A task scheduling algorithm for HPC applications using colored stochastic Petri Net models

2017

The increase in demand for High Performance Computing (HPC) scientific applications motivates the efforts to reduce costs of running these applications. The problem to solve is that of dynamical multi-criterial optimal scheduling of an application on a HPC platform with a high number of heterogeneous nodes. The solution proposed by the authors is a HPC hardware-software architecture that includes the infrastructure for two level (node and inter-node level) adaptive load balancing. The article presents the development of an Coloured Petri Net(CPN) for such an architecture. The model was used for the development of a dynamic distributed algorithm for the scheduling problem. The CPN allowed a …

Optimized secure and reliable distributed data storage scheme and performance evaluation in unattended WSNs

2013

Unattended Wireless Sensor Networks (UWSNs), characterized by the absence of real-time communication between sensors and sinks, impose sensors to retain data till the next visit of a mobile sink to off-load their data. In such networks, if a sensor is compromised, data accumulated in the sensor are exposed to attackers. In addition, by holding the secret key of the compromised sensor, attackers can also learn post-compromise data accumulated by the sensor. Furthermore, once sensors stop working due to, for instance, node crash or battery depletion, all the accumulated data will be lost. In this paper, we propose a secure and reliable data distribution scheme that addresses these challenges.…

Coded addresses in multi-hop wireless sensor networks

2014

Human capital evaluation in knowledge-based organizations based on big data analytics

2020

Abstract Starting from a Human Capital Analysis Model, this work introduces an original methodology for evaluating the performance of employees. The proposed architecture, particularly well suited to the special needs of knowledge-based organizations, is articulated into a framework able to manage cases where data is missing and an adaptive scoring algorithm takes into account seniority, performance, and performance evolution trends, allowing employee evaluation over longer periods. We developed a flexible software tool that gathers data from organizations in an automatic way – through adapted connectors – and generates abundant results on the measurement and distribution of employees’ perf…

The Co-creation Canvas

2021

Abstract Digital transformation has become an increasingly important topic among enterprises and in research. The adoption of enterprise systems is such an investment, and it usually requires significant change management activities to realize the potential benefits. One important issue is how firms should go about to make investments in appropriate digital technology – and the appropriate changes to organizational processes and business models. This is particularly challenging for small and medium-sized enterprises (SMEs). They generally have very limited resources, and they usually depend on external input and cooperation with other companies. Therefore, a successful strategy for many SME…

Smart ICT Support for Business Networks

2005

Modern companies lean increasingly towards innovating and renewing their business operations in a more value-adding and customer-centric direction. As a prerequisite to this, a number of companies are willing to combine their knowledge and resources, for instance by forming strategic alliances supported by a mixture of open ICT infrastructure and proprietary and interoperable ICT applications. This study examines a network of three focal companies that are seeking cost-efficient expansion of their services. As the potential market for these complex customer services is worldwide, the objective is expected to be met only with the help of ICT. Furthermore, the view among the companies is rela…

Introducing SD modelling into planning and control systems to manage SMEs' growth: a learning-oriented perspective

2002

This article emphasises the need for a learning-oriented approach to planning and control as a prerequisite for SMEs’ survival and growth. Such a perspective can be effectively pursued through the development of interactive learning environments linking system dynamics (SD) and accounting models, which provide two complementary views of business phenomena. In order to properly support the drawing up of business plans and the evaluation of results associated with their implementation, the use of financial SD models embodying the accounting perspective is recommended. This is likely to enhance a shift in SME key actors’ minds, as they will be able to analyse under the feedback view financial …