Novel air-to-air data link system based on millimeter wave communication by Pengzheng XU, Qiyue YU, Hongchi LIN, Haining LIU

“…In order to solve the problems of insufficient communication rate between networked fighters, signals being easily eavesdropped and interfered, and unsatisfactory networking performance in the existing air-to-air inter-aircraft data links, a millimeter wave communication air-to-air data link system was proposed.The millimeter wave communication technology was introduced into the data link system, and reconfigurable intelligent surface, orthogonal time frequency space modulation, integrated sensing and communication, and wireless ad hoc network technology were integrated.The analysis and simulation results show that the proposed system is superior to existing systems in terms of transmission bandwidth, anti-interception and anti-interference performance and hardware complexity and cost.At the same time, the proposed system faces technical challenges such as real-time beam tracking, which need further research to solve.…”
Get full text

R~2BAC:a risk-based multi-domain secure interoperation model by LI Rui-xuan, HU Jin-wei, TANG Zhuo, LU Zheng-ding

“…R2BAC,a risk enabled role—based model for multi-domain secure interoperation,was proposed to adapt to the dynamics of distributed environments.R2BAC employs a flexible mechanism to establish interoperation between domains,eliminating the need of a trusted third-party.It translates the problem of interoperation establishment into an op-timality problem,thus achieving optimal interoperability on the premise of domains’ security.The creation and abolish-ment of interoperation relationships in R2BAC are in accord with the dynamics of distributed environments,where do-mains join and leave in an ad hoc manner.Furthermore,R2BAC incorporates risk management methods,leading to at least two advantages.First,a fine-grained authorization mechanism is enabled;second,it is possible to monitor users’ behaviors and adjust their permission sets in a real time manner.…”
Get full text

Research on batch anonymous authentication scheme for VANET based on bilinear pairing by Cheng SONG, Ming-yue ZHANG, Wei-ping PENG, Zong-pu JIA, Zhi-zhong LIU, Xi-xi YAN

“…To solve the problem of efficiency of anonymous authentication in vehicular ad hoc network,a batch anonymous authentication scheme was proposed by using bilinear pairing on elliptic curves .The signature was generated by the roadside unit node (RSU) and the vehicle together.Thus,the burden of VANET certification center was reduced and the authentication efficiency was proved.Meanwhile,the difficulty of the attacker to extract the key was increased.Furthermore,security proofs were given to the scheme in the random oracle model.Analysis shows that the proposed scheme can meet the needs of many kinds of security requirements,the computational overhead is significantly reduced,and the authentication efficiency is improved effectively too.Therefore,the scheme has important theoretical significance and application value under computational capability constrained Internet of things (IoT) environment.…”
Get full text

The implications of ‘jam’ and other ideation technologies for organisational decision making by Morrison Kate

“…The widespread adoption of web 2.0 technologies and their increasing use in the business context, in other words, is creating an inevitable tension between traditional ‘top-down’ strategic decision-making principles and ‘bottom-up’, ad hoc and sometimes unstructured collaborative processes.…”
Get full text

Energy- and Cognitive-Radio-Aware Routing in Cognitive Radio Sensor Networks by Christian H. W. Oey, Ivan Christian, Sangman Moh

“…We present a simple analytical model of the proposed ECR in the viewpoint of network-wide energy and compare it with that of the ad hoc on-demand distance vector (AODV) routing protocol. …”
Get full text

Off-line emergency communication method of power internet of things based on edge computing by Donghong FU, Dan LIU, Guijun SHI, Anxin WANG, Chunxue FAN, Haijun WANG, Yiying ZHANG

“…A new multi-mode node was designed for the emergency communication with the demand of electricity.The node had the multi-mode communication capability of the private network and the public network technology,which could switch smoothly in three modes:the power private network,the wireless Ad Hoc network and the wireless public network.Data were automatically uploaded to the multi-mode terminal,multi-mode terminal through the mode of rapid switching,with the public network resources to achieve rapid network recovery and continuous transmission of data to achieve off-line emergency communications.Meanwhile,an intelligent routing algorithm based on smoothness was proposed,and the three principles of edge network communication were defined.Through the edge calculation method,the calculation and updating of the smoothness were realized to ensure the intelligent,efficient and reliable operation of the edge network in the offline state.…”
Get full text

Evaluating End-to-End Delay in Road-Based Routing Protocols for VANETs with Snake Optimization by Hanadi Hassan karim Al-Maliki, Hamid AL-Asadi

“… Vehicular Ad hoc Networks (VANETs) require efficient routing protocols due to their dynamic network  topologies and high mobility. …”
Get full text

AÇÃO ERGONÔMICA EM SISTEMAS COMPLEXOS PROPOSTA DE UM MÉTODO DE INTERAÇÃO ORIENTADA EM SITUAÇÃO: A CONVERSA-AÇÃO by Mario César Vidal, Renato José Bonfatti, José Mario Carvão

“…Se assim for, é necessária a constituição metódica e sistematizada de um dispositivo de interações orientadas – a que denominamos de conversa-ação – que possibilite analisar a eclosão de bifurcações discursivas, ou cujo tratamento ad hoc, permita caracterizar tais fenômenos de complexidade comunicacional.…”
Get full text

La función historiográfica del mundo asiático en la Historia General de España de Juan de Mariana (siglos XV-XVI) by Iago Brais Ferrás García

“… Este artículo propone, a partir de un enfoque teórico vinculado a la Historia Intelectual, que Juan de Mariana incluye ad hoc las relaciones entre la Península Ibérica y las Indias Orientales en su Historia general de España para satisfacer las expectativas historiográficas de la Monarquía hispánica y de la Compañía de Jesús. …”
Get full text

Reinforcement learning based group key agreement scheme with reduced latency for VANET by Tangwei1 XU, Hailu ZHANG, Chuhuan LIU, Liang XIAO, Zhenmin ZHU

“…Key agreement scheme of vehicle ad hoc networks (VANET) determines the privacy and security against user identity-based attacks,such as spoofing attack.The existing work updates the group shared key at a fixed frequency,which increases the processing latency of the key updates and the encryption and decryption of group communication.A reinforcement learning based dynamic key agreement scheme was proposed to enable the group cluster head to optimize the key update frequency and key length.This scheme optimizes the calculation latency of encryption and decryption based on the number of surrounding vehicles,the previous key update records without the knowledge of the traffic flow model and the access-driven cache attack model.Simulation results show that this scheme reduces the transmission delay of the communication overhead and the computational latency of encryption and decryption,and improves the security of the group key compared with the benchmark scheme.…”
Get full text

Hybrid universality classes of systemic cascades by I. Bonamassa, B. Gross, J. Kertész, S. Havlin

“…Understanding the universal aspects of these phenomena is of fundamental interest, yet typically bound to numerical observations in ad-hoc models and limited insights. Here, we develop a unifying approach that reveals two distinct universality classes of cascades determined by the global symmetry of the cascading process. …”
Get full text

Efficient Heuristic Based on Clustering Approach for OLSR by Ali Choukri, Ahmed Habbani, Mohamed El Koutbi

“…Due to the dynamic nature of mobile ad hoc network (MANET), the quality of service (QoS) requires several improvements. …”
Get full text

Reliability routing protocol based on vehicle density in VANET by Rong CAI, Guoan ZHANG, Li JIN

“…A reliability routing protocol based on vehicle density in vehicular Ad Hoc network was proposed to reduce the complexity of finding an optimal or sub-optimal node of the forwarding node in forwarding range,reducing the average number of hops and enhancing the reliability of the link.Firstly,the size of the unite block was set by the forwarding node according to the vehicle density in the road.And the forwarding range was cut into several equal blocks.Then the farthest block away from the forwarding node was selected.In the selected block,the neighbor node which had the longest link time was chosen as a relay node to forward according to the principle of reliability finally.Compared with EG-RAODV,the simulated results of the proposed routing protocol show that the average number of hops is less and the average distance of one-hop progress is lager,which means the proposed routing protocol can transmit the data packet to destination node more quickly.…”
Get full text

A Self-Adaptive and Link-Aware Beaconless Forwarding Protocol for VANETs by Changle Li, Yun Chen, Xiaolei Han, Lina Zhu

“…With the development of networks, Vehicular Ad-hoc Networks (VANETs) which act as the emerging application enhance the potential power of networks on the traffic safety and the entertainment. …”
Get full text

Interference-aware node access scheme in UAV-aided VANET by Xiying FAN, Chuanhe HUANG, Junyu ZHU, Shaojie WEN

“…In vehicular Ad Hoc network (VANET),frequent link handovers and channel interference can lead to increased transmission delay and decreased network throughput.To address the issues,unmanned aerial vehicle (UAV) were introduced to cooperate with vehicles and construct UAV-assisted air-ground integrated VANET.An interference-aware node access scheme was proposed.The node access problem was formulated as a multi-objective optimization problem considering link transmission rate,link handovers and transmit power.Then the optimization problem was decomposed into two convex optimization sub-problems by dual decomposition method,the sub-problem jointly optimizes handovers and link transmission rate while the sub-problem optimizes the transmit power based on link reliability.Finally,simulation results show that the proposed mechanism can effectively improve data delivery ratio,average end-to-end delay and network throughput.…”
Get full text

An extrapolation method for polarisability assessments of ion-based optical clocks by M D Barrett, K J Arnold

“…The method explicitly accounts for the frequency dependence of relevant atomic transitions without introducing an ad hoc modelling function. It incorporates a priori atomic structure calculations, which allows measurements to be augmented by calculations if there is insufficient data to make a purely measurement based estimate. …”
Get full text

Presencia de valores cívicos en Educación Secundaria Postobligatoria. Percepción del profesorado implicado by Eva Sanz Arazuri, Ana Ponce de León Elizondo, Jesús Vicente Ruiz Omeñaca

“…Cumplimentaron un cuestionario ad-hoc 516 docentes españoles. Mediante la T de Student y ANOVA de un factor se comprobaron las diferencias significativas en función de características sociodemográficas y/o laborales de los docentes. …”
Get full text

Análisis de la importancia de la programación didáctica en la gestión docente del aula y del proceso educativo by Javier RODRÍGUEZ MORENO, Mª Dolores MOLINA JAÉN, Mª Jesús MARTÍNEZ LABELLA

“…Los participantes han sido 293 alumnos y 66 docentes; se ha diseñado un cuestionario “ad hoc” como instrumento, con una escala tipo Likert de 12 ítems en total. …”
Get full text

PAMTree: Partitioned Multicast Tree Protocol for Efficient Data Dissemination in a VANET Environment by Amilcare Francesco Santamaria, Cesare Sottile, Peppino Fazio

“…The way to distribute a wide range of services on Vehicular Ad Hoc Networks is going to be a very interesting research topic, due to the willingness of the investors and the standardization institutions. …”
Get full text

Una nueva estrategia integral para modelar materiales urbanos para ciudades térmicamente habitables. Un caso de estudio en Madrid = A new integrated strategy for modelling urban ma... by Emanuela Giancola, Helena López, Silvia Soutullo, M. Nuria Sánchez, Luis F. Zarzalejo, Ana Gamarra, Israel Herrera, J. Antonio Ferrer, Emanuele Naboni

“…Por estas razones, es necesario crear flujos de trabajo basados en simulaciones ad-hoc capaces de evaluar la influencia de los materiales y sus impactos en ambientes exteriores e interiores. …”
Get full text