Percolation Distribution in Small-World Quantum Networks

Quantum networks have good prospects for applications in the future. Compared with classical networks, small-world quantum networks have some interesting properties. The topology of the network can be changed through entanglement exchange operations, and different network topologies will result in different percolation thresholds when performing entanglement percolation. A lower percolation threshold means that quantum networks require fewer minimum resources for communication. Since a shared singlet between two nodes can still be a limitation, concurrency percolation theory (ConPT) can be used to relax the condition. In this paper, we investigate how entanglement distribution is performed in small-world quantum networks to ensure that nodes in the network can communicate with each other by establishing communication links through entanglement swapping. Any node can perform entanglement swapping on only part of the connected edges, which can reduce the influence of each node in the network during entanglement swapping. In addition, the ConPT method is used to reduce the percolation threshold even further, thus obtaining a better network structure and reducing the resources required.

Families’ perception of children’s academic performance during the COVID-19 lockdown

The COVID-19 pandemic forced many countries to impose a strict lockdown policy on citizens during a prolonged period of time, which led to changes in lifestyle habits. This unprecedented situation has given rise to numerous studies aimed at determining the effects of the changes brought about by this widespread lockdown. One of the important changes was the digitisation of education and, therefore, teaching, which caused a forced and abrupt immersion in distance learning. In this study, a quantitative methodology based on an ex post facto research design was used with the aim of analysing the impact of the COVID-19 lockdown on the academic performance of schoolchildren (aged 3-12 years). A total of 529 parents completed an ad hoc questionnaire on the impact of COVID-19 on their children’s education in Spain. The results produced a robust model based on structural equations that explain 39.7% of the variance in academic performance at home. The family-school relationship was the variable with the greatest explanatory weight (?=.505; p<.05). In conclusion, the benefits derived from a strong relationship between families and schools, evidenced by the creation of cooperation and communication links, facilitate the management of shared educational challenges such as on-line education in times of crises. La situación generada por el obligado confinamiento a la sociedad por la COVID-19 ha llevado, en muchos países, a cambios en los hábitos de vida que han generado numerosos estudios para conocer los efectos de esta nueva situación social. Un importante cambio fue la digitalización del trabajo y, por ende, de la enseñanza, provocando la inmersión forzada en una educación escolar a distancia de una manera abrupta. Se realizó un estudio empleando metodología cuantitativa y basado en un diseño ex post facto, con el objetivo de analizar el impacto que ha tenido el confinamiento por COVID-19 en el desempeño de los escolares (de 3 a 12 años de edad). Un total de 529 participantes completaron el cuestionario CIEN (Cuestionario sobre el Impacto Educativo en la Infancia) sobre impacto educativo de la COVID-19 en sus hijas e hijos escolarizados en España. Los resultados arrojaron un modelo robusto basado en ecuaciones estructurales que explicó el 39,7% de la varianza en el desempeño escolar en casa, siendo la relación familia-escuela, la variable que reveló mayor peso explicativo (?=.505; p<.05). En conclusión, los beneficios derivados de una relación entre la familia y la escuela, patente en el establecimiento de lazos de comunicación y cooperación, facilitan el afrontamiento de retos educativos compartidos tales como la educación a distancia en tiempos de COVID-19.

КОМУНИКАЦИОНЕН ОКТАГОН: АСПЕКТИ НА ИНТЕЛИГЕНТНОСТТА ПРЕЗ ПРИЗМАТА НА КОМУНИКАЦИОННАТА СРЕДА

The aim of the paper is to highlight certain aspects of the semantic profile of the concept of "intelligence" through a model called "communication octagon", focusing on the theory of dynamics of communication links, and to analyze the interaction between the intelligent system and the social environment. The focus of interest in the study is human intelligence, based on individual biological differences, which can be modified as a result of construction and transmission of knowledge, mutual emotional transfer, making cognitive requirements (directed inwards and outwards, towards the environment), and as a result of dynamic social interactions.

Beacon-Based Hybrid Routing Protocol for Large-Scale Unmanned Vehicle Ad Hoc Network

In this paper, we designed a beacon-based hybrid routing protocol to adapt to the new forms of intelligent warfare, accelerate the application of unmanned vehicles in the military field, and solve the problems such as high maintenance cost, path failure, and repeated routing pathfinding in large-scale unmanned vehicle network communications for new battlefields. This protocol used the periodic broadcast pulses initiated by the beacon nodes to provide synchronization and routing to the network and established a spanning tree through which the nodes communicated with each other. An NS3 platform was used to build a dynamic simulation environment of service data to evaluate the network performance. The results showed that when it was used in a range of 5 ~ 35 communication links, the beacon-based routing protocol’s PDR was approximately 10% higher than that of AODV routing protocol. At 5 ~ 50 communication links, the result was approximately 20% higher than the DSDV routing protocol. The routing load was not related to the number of nodes and communication link data and the protocol had better performance than traditional AODV and DSDV routing protocol, which reduced the cost of the routing protocol and effectively improved the stability and reliability of the network. The protocol we designed is more suitable for the scenarios of large-scale unmanned vehicle network communication in the future AI battlefield.

Joint 3-D Positioning and Power Allocation for UAV Relay Aided by Geographic Information

<div>In this paper, we study to employ geographic information to address the blockage problem of air-to-ground links between UAV and terrestrial nodes. In particular, a UAV relay is deployed to establish communication links from a ground base station to multiple ground users. To improve communication capacity, we fifirst model the blockage effect caused by buildings according to the three-dimensional (3-D) geographic information. Then, an optimization problem is formulated to maximize the minimum capacity among users by jointly optimizing the 3-D position and power allocation of the UAV relay, under the constraints of link capacity, maximum transmit power, and blockage. To solve this complex non-convex problem, a two-loop optimization framework is developed based on Lagrangian relaxation. The outer-loop aims to obtain proper Lagrangian multipliers to ensure the solution of the Lagrangian problem converge to the tightest upper bound on the original problem. The inner-loop solves the Lagrangian problem by applying the block coordinate descent (BCD) and successive convex approximation (SCA) techniques, where UAV 3-D positioning and power allocation are alternately optimized in each iteration. Simulation results confifirm that the proposed solution signifificantly outperforms two benchmark schemes and achieves a performance close to the upper bound on the UAV relay system.</div>

Optimal Relay Network for Aerial Remote Inspections

Unmanned Aerial Vehicles (UAVs) in particular multirotors are becoming the {\it de facto} tool for aerial sensing and remote inspection. In large industrial facilities, a UAV can transmit an online video stream to inspect difficult to access structures, such chimneys, deposits and towers. However, the communication range is limited, constraining the UAV operation range. This limitation can be overcome with relaying UAVs placed between the source UAV and the control station, creating a line of communication links. In this work we assume the use of a digital data packet network technology, namely WiFi, and tackle the problem of defining the exact placement for the relaying UAVs that creates an end-to-end channel with maximal delivery of data packets. We consider asymmetric communication links and we show an increase as large as $15$\% in end-to-end packet delivery ratio when compared to an equidistant placement. We also discuss the deployment of such a network and propose a fully distributed method that converges to the global optimal relay positions taking, on average, 1.4 the time taken by a centralized method.

Accounting procedures digital transformation for business processes improvement

The article researches the impact of the digitalization and digital transformation process on the construction of functional management systems of modern enterprises. The article materials consider new information opportunities for business models building and business processes organization. Approaches to the improvement of operational processes and their optimization are substantiated. The evidence is given that the possible way to implement digitalization in certain areas may be: the concept (strategy), staff training and education, the new technologies implementation. It is defined that the implementation of the digital transformation of the business model can take place in stages at the level of its individual elements or components. It is supposed reasonable to use a system-oriented approach to management, which is based on understanding the object of management as a whole, the need for internal and external communication links, i.e., a set of related management methods and tools in the enterprise and its structural units. System-oriented management of the digitalization process in the article is considered to involve the business processes transformation. Such processes should be based on perfect digital strategy planning. Important components are the feasibility assessment of practical digital initiatives implementation, monitoring of promising areas of action, forecasting the expected effect of digitalization and comparison of innovative initiatives. The application of a systematic approach to the management of the digitalization process is justified at certain stages, which will allow in a certain sequence and order to get the maximum effect and ensure the achievement of goals and acceptable results. The main stages of system-oriented management of the business processes digitalization process are offered, as well as the main groups of factors of influence (external and internal) on the digitalization implementation process are determined.

Investigation of the Flow-Based Fast Reroute Model with Implementation of a Multimedia Quality Protection Scheme

In this paper, a tensor flow-based fast reroute model with multimedia quality protection is proposed. In the model, the conditions for implementing a multipath routing strategy and flow conservation are introduced taking into account possible packet loss at the network nodes and preventing overloading communication links both when using the primary and backup routes. At the same time, the novelty of the proposed solution is the formalization of the conditions of protection of the Quality of Experience level in terms of multimedia quality along the primary and backup routes. These conditions have been obtained during the tensor formalization of the network, which made it possible to calculate the quality of service indicators: packet loss probabilities, as well as the average end-to-end delay for audio and video flows transmitted in the multimedia session using the primary and backup routes, respectively. As a criterion for the optimality of the obtained solutions, a condition has been selected related to maximizing the overall performance of the infocommunication network. The results of the research of the proposed model confirm the adequacy of the numerical research results obtained for solving the problem of fast rerouting with link/node protection.