Stabilization of an overloaded queueing network using measurement-based admission control

Admission control can be employed to avoid congestion in queueing networks subject to overload. In distributed networks the admission decisions are often based on imperfect measurements on the network state. This paper studies how the lack of complete state information affects the system performance by considering a simple network model for distributed admission control. The stability region of the network is characterized and it is shown how feedback signaling makes the system very sensitive to its parameters.Comment: Published at http://dx.doi.org/10.1239/jap/1143936256 in the Journal of Applied Probability (http://projecteuclid.org/jap) by the Applied Probability Trust (http://www.appliedprobability.org/

Algorithmic Methods in Queues and in the Exploration of Point Processes

This is a review of methodology for the algorithmic study of some useful models in point process and queueing theory, as discussed in three lectures at the Summer Institute at Sozopol, Bulgaria. We provide references to sources where the extensive details of this work are found. For future investigation, some open problems and new methodological approaches are proposed

Alien Registration- Neuts, Gustave E. (Portland, Cumberland County)

https://digitalmaine.com/alien_docs/32097/thumbnail.jp

Crowding Perception in a Tourist City: A Question of Preference

Two main topics are analysed in this paper: a crowding model for an urban destination is tested by the use of a binary logistic model in order to identify the variables influencing crowding perception; and the inherent negativity of the crowding concept, as is often assumed, is examined through association statistics. The results confirmed that personal and behavioural variables have a larger effect on the perception of crowding than use-level. Furthermore, the relationship between crowding and experience, while significantly negative, could only be found in respondents with a preference for low, and a perception of high, use levels, while for the majority of individuals the perception of a certain crowding level did not lead to a negative evaluation of the conditions. This proves that the concept of crowding cannot be assumed to be implicitly negative, and needs individual preferences to be fully understood.status: publishe

A Quality Assessment of Tourist Information: the Case of Nautical Tourism at Shiretoko Peninsula

The success of tourism promotion in a destination partially depends on the extent to which it successfully links varied products catering to a heterogeneous group of visitors in a multi-client system. In contemporary destination marketing, communication between the service providers at the destination and the (prospective) tourists has become increasingly important as a result of the rise in informal communication channels and social media. This paper focuses on the effect of using different information sources when booking a cruise tour in Shiretoko Peninsula (a natural World Heritage Site) by employing a multi-group structural model. Our findings revealed that a mismatch between the expectation created by the visitors based on the information about the site and the satisfaction they experience when visiting the place can be a strong factor of dissatisfaction, with negative implications on the possible recommendations and loyalty. Additionally, it was possible to conclude that information available on the internet and via guidebooks seems to negatively affect satisfaction on certain elements and routes, while local information from tourist offices, hotels and local shops was found less problematic.The success of tourism promotion in a destination partially depends on the extent to which it successfully links varied products catering to a heterogeneous group of visitors in a multi-client system. In contemporary destination marketing, communication between the service providers at the destination and the (prospective) tourists has become increasingly important as a result of the rise in informal communication channels and social media. This paper focuses on the effect of using different information sources when booking a cruise tour in Shiretoko Peninsula (a natural World Heritage Site) by employing a multi-group structural model. Our findings revealed that a mismatch between the expectation created by the visitors based on the information about the site and the satisfaction they experience when visiting the place can be a strong factor of dissatisfaction, with negative implications on the possible recommendations and loyalty. Additionally, it was possible to conclude that information available on the internet and via guidebooks seems to negatively affect satisfaction on certain elements and routes, while local information from tourist offices, hotels and local shops was found less problematic

Extension of PRISM by Synthesis of Optimal Timeouts in Fixed-Delay CTMC

We present a practically appealing extension of the probabilistic model checker PRISM rendering it to handle fixed-delay continuous-time Markov chains (fdCTMCs) with rewards, the equivalent formalism to the deterministic and stochastic Petri nets (DSPNs). fdCTMCs allow transitions with fixed-delays (or timeouts) on top of the traditional transitions with exponential rates. Our extension supports an evaluation of expected reward until reaching a given set of target states. The main contribution is that, considering the fixed-delays as parameters, we implemented a synthesis algorithm that computes the epsilon-optimal values of the fixed-delays minimizing the expected reward. We provide a performance evaluation of the synthesis on practical examples

Resident Support for Tourism Development: Application of a Simplified Resident Empowerment through Tourism Scale on Developing Destinations in Flanders

While the potential macro-economic benefits of tourism development have been well-established, the negative social effects of uninhibited growth have received increased attention in the last decade, emphasizing the central role of communities in the search for a sustainable balance in tourism. This paper focuses on the relatively underdeveloped Scheldeland region in Flanders (Belgium), where a strategic goal is to leverage cultural and natural heritage to boost development. Via a resident questionnaire based on a simplified version of the Resident Empowerment through Tourism Scale (RETS), we identified support for tourism development and deconstructed the drivers of this support. The objective was to empirically validate the research instrument and underlying theory in a situation of relative ‘undertourism’ and prospective future growth. The questionnaire collected 2058 responses, and the partial least squares-structural equation modeling (PLS-SEM) results indicated that support for tourism, which was generally high across the seven municipalities, was mainly affected by social, psychological, and political empowerment, with personal economic benefits not playing a significant role. These results show that social exchange theory (SET) as a theoretical basis for potential tourism support has limited validity in currently underdeveloped destinations. Secondly, comparatively speaking, the municipalities with the lowest tourism development were least supportive of tourism growth, with an increase in tourism intensity seemingly leading to increasing support due to a higher awareness of accrued benefits through tourismWhile the potential macro-economic benefits of tourism development have been well-established, the negative social effects of uninhibited growth have received increased attention in the last decade, emphasizing the central role of communities in the search for a sustainable balance in tourism. This paper focuses on the relatively underdeveloped Scheldeland region in Flanders (Belgium), where a strategic goal is to leverage cultural and natural heritage to boost development. Via a resident questionnaire based on a simplified version of the Resident Empowerment through Tourism Scale (RETS), we identified support for tourism development and deconstructed the drivers of this support. The objective was to empirically validate the research instrument and underlying theory in a situation of relative ‘undertourism’ and prospective future growth. The questionnaire collected 2058 responses, and the partial least squares-structural equation modeling (PLS-SEM) results indicated that support for tourism, which was generally high across the seven municipalities, was mainly affected by social, psychological, and political empowerment, with personal economic benefits not playing a significant role. These results show that social exchange theory (SET) as a theoretical basis for potential tourism support has limited validity in currently underdeveloped destinations. Secondly, comparatively speaking, the municipalities with the lowest tourism development were least supportive of tourism growth, with an increase in tourism intensity seemingly leading to increasing support due to a higher awareness of accrued benefits through tourism

Meeting connectivity requirements in a wireless multihop network

This paper investigates the connectivity probability of 1-dimensional ad hoc networks in which nodes have random, non-identically distributed locations, this leads to optimization of the number of nodes required. An empirical approach is used. We fit a parametric distribution to the CDF of the maximum distance between adjacent nodes. Special and extreme cases which are not covered by the empirical approach are treated separately