Search results for "Computer network"
showing 10 items of 1634 documents
Host community perceptions of cruise tourism in a homeport: A cluster analysis
2018
Abstract This study applies a factor-cluster analysis to a sample of 321 residents in the city of Valencia based on their perceptions of the impacts of cruises on their city. Three clusters of residents were identified, namely 'pessimists', 'cautious supporters' and 'optimists'. Overall, the findings reveal that most respondents doubt the magnitude of positive impact in terms of welfare, social, economic and heritage aspects. Furthermore, there are significant differences between the three clusters, based on age and geographical proximity to the tourist area and port. No significant differences were found based on gender, level of education, numbers of members in household, occupation, leng…
Identifying patterns in channel usage across the search, purchase and post-sales stages of shopping
2015
Different motivations explain channel choice for search, purchase and post-sales.Channel choice is affected by the product category: search/purchase goods.Product involvement is the most relevant variable explaining multichannel behavior.Cross-channel synergies as consumers use both channels at each shopping stage.Meaningful segments based on the choice of channel are identified and characterized. Consumers today are using various channels to complete their purchase process. As shoppers pursue different goals at each stage of the process, channel choice may be explained by different drivers for search, purchase and post-sales activities. Our research framework is based on an extension of th…
Facebook brand community bonding: The direct and moderating effect of value creation behaviour
2019
Abstract The present research deepens in the understanding of brand bonding in Facebook brand communities, drawing on value creation behaviours, the parasocial interaction paradigm and the attachment theory. Building up on these theories, our proposed conceptual model posits a direct relationship between value creation behaviour and brand community bonding, resulting from users’ interactions with other community members. The study also examines the moderating role of value co-creation behaviour on community members’ predispositions to develop emotionally based relationships with brands. The sample of the study consisted of 370 followers of brand Facebook pages and the model was assessed usi…
Cross-cultural Perceptions of Onshore Guided Tours: A Qualitative Approach Based on eWOM
2016
Recognizing the importance of the study of guided tour experiences and being aware of the cross-cultural variations of services’ perceptions, the purpose of this article is to examine if cruise tourists from the two main generating markets (Europe and North America) perceive differently a port of call guided tour based on the content of the eWOM generated. The data set was comprised of 334 reviews on guided tours undertaken in Spanish ports of call and published during the period 2009–2015 on the major travel Web site Tripadvisor. The thematic content analysis of the data was performed using the text mining software Leximancer. The results yielded different pictures for the experiences desc…
Designing a multi-layer edge-computing platform for energy-efficient and delay-aware offloading in vehicular networks
2021
Abstract Vehicular networks are expected to support many time-critical services requiring huge amounts of computation resources with very low delay. However, such requirements may not be fully met by vehicle on-board devices due to their limited processing and storage capabilities. The solution provided by 5G is the application of the Multi-Access Edge Computing (MEC) paradigm, which represents a low-latency alternative to remote clouds. Accordingly, we envision a multi-layer job-offloading scheme based on three levels, i.e., the Vehicular Domain, the MEC Domain and Backhaul Network Domain. In such a view, jobs can be offloaded from the Vehicular Domain to the MEC Domain, and even further o…
New approach to delay-dependent H∞ control for continuous-time Markovian jump systems with time-varying delay and deficient transition descriptions
2015
Abstract This paper proposes an input–output (IO) approach to the delay-dependent stability analysis and H ∞ controller synthesis for a class of continuous-time Markovian jump linear systems (MJLSs). The concerned systems are with a time-varying delay in the state and deficient mode information in the Markov stochastic process, which simultaneously involves the exactly known, partially unknown and uncertain transition rates. It is first shown that the original system with time-varying delay can be reformulated by a new IO model through a process of two-term approximation and the stability problem of the original system can be transformed into the scaled small gain (SSG) problem of the IO mo…
Energy Harvesting Powered Packet Transmissions in Duty-Cycled WSNs: A DTMC Analysis
2017
Energy harvesting (EH) promises an extended lifetime for wireless sensor networks (WSNs), supplying sensor nodes with accumulated energy from natural sources. Different from battery powered sensors, nodes in EH-enabled WSNs are equipped with an energy harvesting accessory in order to extract energy from surrounding sources. Based upon the harvested energy, sensor nodes perform data exchange activities. In this paper, we develop two discrete time Markov chain (DTMC) models to analyze the performance of packet transmissions in such a WSN while employing a generic synchronous medium access control (MAC) protocol. Using the proposed DTMC models, we investigate the effect of EH over a specific s…
A Single radio based channel datarate-aware parallel rendezvous MAC protocol for cognitive radio networks
2009
Channel hopping based parallel rendezvous multichannel MAC protocols have several advantages since they do not need a control channel, require only one transceiver, and produce higher system capacity. However, channel hopping sequences in existing parallel rendezvous MAC protocols have been designed as irrelevant to channel datarates, leading to under-utilization of channel resources in multi-rate multi-channel networks. Considering that datarates among channels may be different, we propose a dynamic parallel rendezvous multichannel MAC protocol for synchronized cognitive radio networks in which the secondary users adjust their own distinct hopping sequences according to the datarates of th…
Frame Based Equipment Medium Access in LTE-U: Mechanism Enhancements and DTMC Modeling
2017
To address the challenge of ever-growing data rate demand and benefit from the popularity of WiFi capability in mobile phones, 3GPP is studying techniques which enable the coexistence of WiFi and LTE in the unlicensed band, known as LTEU. Two flavors of the listen before talk (LBT) principle, referred to as load based equipment (LBE) and frame based equipment (FBE), are recommended by 3GPP. In this paper, we investigate two enhanced FBE mechanisms, i.e., 1) enhanced FBE (E-FBE); and 2) backoff and idle time reduction FBE (BITR-FBE) for the purpose of improving FBE. After presenting the idea of E-FBE, we propose BITR-FBE which can further improve throughput, shorten delay and reduce energy c…
Collision Avoidance in Wake-Up Radio Enabled WSNs: Protocol and Performance Evaluation
2018
In wake-up radio (WuR) enabled wireless sensor networks (WSNs), the envisaged application scenarios are primarily targeted at low traffic load conditions. When applying WuR to medium or heavy traffic load scenarios, however, collisions among wake-up calls (WuCs) may happen, resulting in a lower packet delivery ratio (PDR). In this paper, we propose a media access control protocol for WuR- enabled WSN that is capable of avoiding WuC collisions by activating a contention-based collision avoidance mechanism for WuC transmissions. The performance of the proposed protocol is evaluated by a Markov chain based mathematical model and is compared with a WuR protocol that performs only clear channel as…