23,616 research outputs found
A Calculus of Mobility and Communication for Ubiquitous Computing
We propose a Calculus of Mobility and Communication (CMC) for the modelling
of mobility, communication and context-awareness in the setting of ubiquitous
computing. CMC is an ambient calculus with the in and out capabilities of
Cardelli and Gordon's Mobile Ambients. The calculus has a new form of global
communication similar to that in Milner's CCS. In CMC an ambient is tagged with
a set of ports that agents executing inside the ambient are allowed to
communicate on. It also has a new context-awareness feature that allows
ambients to query their location. We present reduction semantics and labelled
transition system semantics of CMC and prove that the semantics coincide. A new
notion of behavioural equivalence is given by defining capability barbed
bisimulation and congruence which is proved to coincide with barbed
bisimulation congruence. The expressiveness of the calculus is illustrated by
two case studies.Comment: In Proceedings WWV 2015, arXiv:1508.0338
High dimensionality carrierless amplitude phase modulation technique for radio over fiber system
Advanced modulation formats such as carrierless amplitude phase (CAP) modulation technique is one of the solutions to increase flexibility and high bit rates to support multi-level and multi-dimensional modulations with the absence of sinusoidal carrier. Recent work are focussing on the 2D CAP-64 QAM Radio-over-Fiber (RoF) system but no extension of higher dimensions is reported. This thesis expands the area of CAP modulation technique and RoF system. The work described in this thesis is devoted to the investigation of 1.25 GSa/s sampling rate for multi-level and multi-dimensional CAP in point-to-point (P2P) and RoF system at 3 km single-mode fiber (SMF). Another advanced modulation format which is known as discrete multitone (DMT) is compared with CAP modulation in order to observe the performance in different modulation schemes. The 4QAM-DMT and 16QAM-DMT at different number of subcarriers are carried out in this propagation. Based on the results, the transmission performance in terms of BER and received optical power for RoF transmission are degraded to almost 3 dB when comparing to 3 km SMF transmission. These are caused by the wireless power loss and impairment effects. The bit rate and spectral efficiency can be increased with the increasing number of levels, and may decreased once the number of dimensions is increased due to the higher up-sampling factor. However, the additional dimensions can be used to support multiple service applications. Therefore, it can be concluded that CAP has better performance as compared to DMT in terms of higher spectral efficiency and data rate. To conclude, the results presented in this thesis exhibit high feasibility of CAP modulation in the increasing number of dimensions and levels. Thus, CAP has the potential to be utilized in multiple service allocations for different number of users
Design and Value: Spatial Form and the Economic Failure of a Mall
Real estate analysts have not had the tools to identify the functional problems of real estate because they have not focused on configuration. Space syntax is a way to represent, describe and evaluate spatial configurations or patterns created through building and urban design. Space syntax was used to systematically describe the configuration of a failed luxury shopping mall. Shape recognition techniques transform the plan into a mathematical network that can be analyzed. Network node parameters can be related to more traditional measures like occupancy and revenues by location. Thus revealed, the underlying spatial structure of the failed mall is compared to that of a similar but successful mall and its functional deficiencies identified.
Market-based Recommendation: Agents that Compete for Consumer Attention
The amount of attention space available for recommending suppliers to consumers on e-commerce sites is typically limited. We present a competitive distributed recommendation mechanism based on adaptive software agents for efficiently allocating the 'consumer attention space', or banners. In the example of an electronic shopping mall, the task is delegated to the individual shops, each of which evaluates the information that is available about the consumer and his or her interests (e.g. keywords, product queries, and available parts of a profile). Shops make a monetary bid in an auction where a limited amount of 'consumer attention space' for the arriving consumer is sold. Each shop is represented by a software agent that bids for each consumer. This allows shops to rapidly adapt their bidding strategy to focus on consumers interested in their offerings. For various basic and simple models for on-line consumers, shops, and profiles, we demonstrate the feasibility of our system by evolutionary simulations as in the field of agent-based computational economics (ACE). We also develop adaptive software agents that learn bidding strategies, based on neural networks and strategy exploration heuristics. Furthermore, we address the commercial and technological advantages of this distributed market-based approach. The mechanism we describe is not limited to the example of the electronic shopping mall, but can easily be extended to other domains
Marketing images and consumers' experiences in selling environments
In a well-functioning market, consumers exert choices not just in purchases of products but also in
selections of locations to enjoy shopping. Scholarly research has demonstrated that retail
atmospheres impact on shoppersâ pleasurable shopping experiences. Demonstrating the marketing
concept in action, shoppers consistently respond to this empowerment by for example, spending
more time shopping and spending more money in retail facilities that are perceived to offer a
pleasanter atmosphere and experience. This research pivots round an in-depth qualitative study that
evaluated the impact of a plasma screens and specific informational content on shopping centre
user behaviour. A phenomenological study of the effects of the medium, and the way in which
these systems influence behaviour, permitted a far deeper investigation of our sample group vis-Ă vis
increased browsing time and the propensity to spend. A series of eight focus discussions were
conducted with local user groups of varying age and gender. Key themes drawn from the group
discussions using axial coding indicated that the influence created by the images varied with
subjects and settings. The general consensus was that such âscreensâ created a certain ambience that
influenced the way our subjects felt about the selling environment under study. Moreover, for our
sample groups, there was clearly a link between the screened images and modern expectations of a
selling environment. The plasma screens provided added enjoyment to shoppersâ experiences,
providing them with more information enabling more informed shopping choices. The research
concludes with implications for strategic marketing, theory and practice
Creating a rehabilitation living lab to optimize participation and inclusion for persons with physical disabilities
AbstractWe present an on-going multidisciplinary and multisectorial strategic development project put forth by the Centre for Interdisciplinary Research in Rehabilitation of greater MontrĂ©al (CRIR) in Quebec, Canada and its members, in collaboration with a MontrĂ©al ârenovation-readyâ shopping mall, local community organizations, and local, national and international research and industrial partners. Beginning in 2011, within the context of the Mall as Living Lab (MALL), more than 45 projects were initiated to: (1) identify the environmental, physical and social obstacles and facilitators to participation; (2) develop technology and interventions to optimize physical and cognitive function participation and inclusion; (3) implement and evaluate the impact of technology and interventions in vivo. Two years later and working within a participatory action research (PAR) approach, and the overarching WHO framework of the International Classification of Functioning, Disability and Health (ICF), we discuss challenges and future endeavors. Challenges include creating and maintaining partnerships, ensuring a PAR approach to engage multiple stakeholders (e.g. people with disabilities, rehabilitation and design researchers, health professionals, community members and shopping mall stakeholders) and assessing the overall impact of the living lab. Future endeavors, including the linking between research results and recommendations for renovations to the mall, are also presented
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