Raciocínio Baseado em Casos para a Configuração de Modelos de Alocação de Banda

The extensive adoption of computer networks, especially the Internet, using services that require extensive data flows, has generated a growing demand for computational resources, mainly bandwidth. Bandwidth Allocation Models (BAM) have proven to be a viable alternative to network management where the bandwidth resource is shared to meet the high demand for the network. However, managing these networks has become an increasingly complex task, and solutions that allow for nearly autonomous configuration with less intervention of the network manager are highly demanded. The use of Case-Based Reasoning (CBR) techniques for network management has proven satisfactory for decision making and network management. This work presents a proposal for network reconfiguration based on the CBR cycle, intelligence, and cognitive module for MPLS (Multi-Protocol Label Switching) networks. The results show that CBR is a feasible solution for auto-configuration with autonomic characteristics in the MPLS using bandwidth allocation models (BAMs). The proposal improved the general network performance.

Cryptoanalysis on a Cloud-Centric Internet-of-Medical-Things-Enabled Smart Healthcare System

The interconnecting of the biomedical sensors (in healthcare system) with cloud for the internet-of-medical-things (IoMT) technology has great potential to ameliorate people's living conditions. The privacy-preserving of personal health information (PHI) and the mutual authentication between the sensors and other entities are two main factors that affect the further applications of cloud-centric IoMT technology. In the recent work [IEEE IoT Journal, vol. 7(10), 10650-10659, 2020], Kumar and Chand applied identity-based aggregate signcryption scheme to the smart healthcare system (KC-system, for short), which provides privacy-preserving of PHI and the mutual authentication function, simultaneously. However, in this paper, we carefully analyze the security of KCsystem and find out that the critical authentication keys of entities can be easily recovered from their communication contents. In other words, the mutual authentication function of KC-system can be easily broken. Moreover, the recovering of the keys will lead to the tedious processes, including obtaining partial private key (from network manager) and requesting for key-protection (from key-protection servers), become completely useless. Finally, we remark that it seems to be hard to remedy the current KC-system so that it is immune to our attack.

Prediction of Friction Degradation in Highways with Linear Mixed Models

The development of a linear mixed model to describe the degradation of friction on flexible road pavements to be included in pavement management systems is the aim of this study. It also aims at showing that, at the network level, factors such as temperature, rainfall, hypsometry, type of layer, and geometric alignment features may influence the degradation of friction throughout time. A dataset from six districts of Portugal with 7204 sections was made available by the Ascendi Concession highway network. Linear mixed models with random effects in the intercept were developed for the two-level and three-level datasets involving time, section and district. While the three-level models are region-specific, the two-level models offer the possibility to be adopted to other areas. For both levels, two approaches were made: One integrating into the model only the variables inherent to traffic and climate conditions and the other including also the factors intrinsic to the highway characteristics. The prediction accuracy of the model was improved when the variables hypsometry, geometrical features, and type of layer were considered. Therefore, accurate predictions for friction evolution throughout time are available to assist the network manager to optimize the overall level of road safety.

Hyper-Angle Exploitative Searching for Enabling Multi-Objective Optimization of Fog Computing

Fog computing is an emerging technology. It has the potential of enabling various wireless networks to offer computational services based on certain requirements given by the user. Typically, the users give their computing tasks to the network manager that has the responsibility of allocating needed fog nodes optimally for conducting the computation effectively. The optimal allocation of nodes with respect to various metrics is essential for fast execution and stable, energy-efficient, balanced, and cost-effective allocation. This article aims to optimize multiple objectives using fog computing by developing multi-objective optimization with high exploitive searching. The developed algorithm is an evolutionary genetic type designated as Hyper Angle Exploitative Searching (HAES). It uses hyper angle along with crowding distance for prioritizing solutions within the same rank and selecting the highest priority solutions. The approach was evaluated on multi-objective mathematical problems and its superiority was revealed by comparing its performance with benchmark approaches. A framework of multi-criteria optimization for fog computing was proposed, the Fog Computing Closed Loop Model (FCCL). Results have shown that HAES outperforms other relevant benchmarks in terms of non-domination and optimality metrics with over 70% confidence of the t-test for rejecting the null-hypothesis of non-superiority in terms of the domination metric set coverage.

Development of a Network Manager Compatible with WirelessHART Standard

The use of industrial wireless networks has been growing continuously and it hasbecome an alternative to wired networks. One of the main elements of an industrial wireless network is the network manager, this component is responsible for tasks related to the network construction and maintenance. This work presents the development of a network manager compatible with the WirelessHART protocol, but also customizable, where it is possible to make modifications in order to carry out studies with this protocol. Case studies are presented where the developed tool was used for studies related to communications scheduling, adaptive channel mapping and fast data collection, thus proving the efficiency of the proposed manager.

Towards handover in IWN: a fast data collection technique

The communication protocols used in industrial wireless networks are designed to meet requirements of security and reliability in communications. These requirements are guaranteed by techniques like message enciphering and radio frequency interference avoidance. The WirelessHART protocol was the first one developed specifically to meet the needs of industrial applications. WirelessHART networks use centralized control where one element, the network manager, is responsible for configuring, creating and maintaining the network. This feature increases reliability as management conflicts will not occur, but the rout of communications between network manager and field devices may need several hops on the network due to the mesh topology employed in the protocol. Procedures such as joining new devices require the exchange of a series of commands with the network manager, which takes a large period of time to be executed. This paper presents a technique designed for mobile devices aiming the reduction of time needed for the publishing service. The proposed technique favors the use of mobile devices with strict time constraints under the range covered by the wireless network and precedes the study of an efficient handover process. The results present a time comparison between the standard and proposed data collection.

Rizaeddin Fakhreddin: a Reformer and a “Network Manager”

In an introductory article to the thematic issue “Rizaeddin Fakhreddin: a Reformer and a ‘Network Manager’” we attempt to look at the religious, social, publishing, scientific, and literary legacy of Rizaeddin Fakhreddin in the light of his participation in the construction of Muslim public space within Russian society.

CITYZER observation network and data delivery system

CITYZER develops new digital services and products to support decision-making processes related to weather and air quality in cities. This includes, for example, early warnings and forecasts (0–24 h), which allow for avoiding weather-related accidents, mitigate human distress and costs from weather-related damage and bad air quality, and generally improve the resilience and safety of the society. The project takes advantage of the latest scientific know-how and directly exploits the expertise obtained from earlier projects. Central to the project is the Observation Network Manager NM10 developed by Vaisala, on which CITYZER defines and builds new commercial services and connects new sensor networks, for example, for air quality measurements, as well as the ENFUSER local-scale air quality modelling system developed by the Finnish Meteorological Institute, for real-time air quality forecasts and nowcasts.

Crisis management in the European Air Traffic Management Network

The article presents the genesis and evolution of Network Manager (NM) activities in terms of responding to disturbances and crisis situations and mitigating their effects on the European air traffic management network. The objective of these activities, carried out in coordination with the operational stakeholders and other relevant stakeholders, is to ensure maximum continuity and safety of air navigation services for aircraft operators and airports. The review, analysis and evaluation of how to respond to extraordinary and unforeseen events with a negative impact on the functioning of the air transport sector in Europe covers the period 2010-2018.

AIR TRAFFIC CRISIS MANAGEMENT IN EUROPEAN AIRSPACE – THE LEGAL CONTEXT AND THE EXPERIENCE OF THE NETWORK MANAGER

The article looks at the genesis and evolution of Network Manager (NM) activities in terms of responding to disturbances and crisis situations and mitigating their effects on the European air traffic management network. The objective of these activities, carried out in coordination with the operational stakeholders and other relevant stakeholders, is to ensure the maximum continuity and safety of air navigation services for aircraft operators and airports. The review, analysis and evaluation of how to respond to extraordinary and unforeseen events that have a negative impact on the functioning of the air transport sector in Europe covers the period 2010-2019.