Search results for " networking"
showing 10 items of 1264 documents
The Fluid City Paradigm: a deeper innovation
2016
Waterfront regeneration needs to be disruptive: a paradigm shift and a deeper innovation of methods and tools must be set up in order to act in the changing times we live. In current global crisis, a true metamorphosis, the strong flows of financial, social and relational capitals that powered regeneration of urban waterfronts over the last twenty years are no longer available to be tapped in an indiscriminate manner as was the case until just a few years ago. The most dynamic cities in the future will no longer be those that are able to attract big projects and rich investors driven by the real estate market or leisure-based development, but the cities have deep socio-cultural diversity an…
Business legacy planning for mega events: The case of the 2022 World Cup in Qatar
2016
Abstract This study aimed to explore the processes of business networking which lays the foundation for business legacy outcomes initiated by the award of a mega event in a region. Building on the work of Spilling ( 1996 ) on mega event business impacts, we interviewed 24 stakeholders in Qatar from sport organizations about business planning and impacts of the 2022 World Cup in Qatar. Qualitative data analysis revealed a process that involved a relationship between certain factors. For example, country context factors included political, religious and cultural elements. These country context factors can create business drivers and barriers that lead to sustainable business networking event …
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…
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…
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…
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…
Event-Triggered Sleeping for Synchronous DC MAC IN WSNs: Mechanism and DTMC Modeling
2016
Overhearing and idle listening are two primary sources for unnecessary energy consumption in wireless sensor networks. Although introducing duty cycling in medium access control (MAC) reduces idle listening, it cannot avoid overhearing in a network with multiple contending nodes. In this paper, we propose an event-triggered sleeping (ETS) mechanism for synchronous duty-cycled (DC) MAC protocols in order to avoid overhearing when a node is not active. This ETS mechanism applies to any synchronous DC MAC protocols and makes them more energy efficient. Furthermore, we develop a two dimensional discrete time Markov chain model to evaluate the performance of the proposed ETS mechanism by integra…
Energy Efficient Consecutive Packet Transmissions in Receiver-Initiated Wake-Up Radio Enabled WSNs
2018
In wake-up radio (WuR)-enabled wireless sensor networks, data communication among nodes is triggered in an on-demand manner, by either a sender or a receiver. For receiver-initiated WuR (RI-WuR), a receiving node wakes up sending nodes through a wake-up call. Correspondingly sending nodes transmit packets in a traditional way by competing with one another multiple times in a single operational cycle. In this paper, we propose a receiver-initiated consecutive packet transmission WuR (RI-CPT-WuR) medium access control (MAC) protocol, which eliminates multiple competitions to achieve higher energy efficiency. Furthermore, we develop two associated discrete time Markov chains (DTMCs) for evalua…
Enforcing mobile security with location-aware role-based access control
2013
This paper describes how location-aware role-based access control RBAC can be implemented on top of the Geospatial eXtensible Access Control Markup Language GeoXACML. It furthermore sketches how spatial separation of duty constraints both static and dynamic can be implemented using GeoXACML on top of the XACML RBAC profile. The solution uses physical addressing of geographical locations, which facilitates easy deployment of authorisation profiles to the mobile device. Location-aware RBAC can be used to implement location-dependent access control and also other security enhancing solutions on mobile devices, such as location-dependent device locking, firewall, intrusion prevention or payment…