Markov Modulated Process to Model Human Mobility

Author(s):  
Brian Chang ◽  
Liufei Yang ◽  
Mattia Sensi ◽  
Massimo A. Achterberg ◽  
Fenghua Wang ◽  
...  
1996 ◽  
Vol 10 (3) ◽  
pp. 429-441 ◽  
Author(s):  
Woo-Yong Choi ◽  
Chi-Hyuck Jun

We propose a new approach to the analysis of a discrete-time queueing system whose input is generated by a Markov-modulated process and whose service rate is constant. Renewal cycles are identified and the system state on each renewal cycle is modeled as a one-dimensional Markov chain.


2006 ◽  
Vol 43 (4) ◽  
pp. 1013-1027 ◽  
Author(s):  
Predrag R. Jelenković ◽  
Ana Radovanović ◽  
Mark S. Squillante

It was recently proved by Jelenković and Radovanović (2004) that the least-recently-used (LRU) caching policy, in the presence of semi-Markov-modulated requests that have a generalized Zipf's law popularity distribution, is asymptotically insensitive to the correlation in the request process. However, since the previous result is asymptotic, it remains unclear how small the cache size can become while still retaining the preceding insensitivity property. In this paper, assuming that requests are generated by a nearly completely decomposable Markov-modulated process, we characterize the critical cache size below which the dependency of requests dominates the cache performance. This critical cache size is small relative to the dynamics of the modulating process, and in fact is sublinear with respect to the sojourn times of the modulated chain that determines the dependence structure.


2018 ◽  
Vol 7 (4.10) ◽  
pp. 942 ◽  
Author(s):  
R. Sakthi ◽  
V. Vidhya ◽  
K. Mahaboob Hassain Sherieff ◽  
. .

In this research work we are concerned with single unit server queue  queue with Markov Modulated process in Poisson fashion and the service time follow exponential distribution. The system is framed as a state dependent with the arrival process as Markov Modulated input and service is rendered by a single server with variation in service rate based on the intensity of service state of the system. The rate matrix that is essential to compute the stationary probability vector is obtained and various performance measures are computed using matrix method.


2006 ◽  
Vol 43 (04) ◽  
pp. 1013-1027 ◽  
Author(s):  
Predrag R. Jelenković ◽  
Ana Radovanović ◽  
Mark S. Squillante

It was recently proved by Jelenković and Radovanović (2004) that the least-recently-used (LRU) caching policy, in the presence of semi-Markov-modulated requests that have a generalized Zipf's law popularity distribution, is asymptotically insensitive to the correlation in the request process. However, since the previous result is asymptotic, it remains unclear how small the cache size can become while still retaining the preceding insensitivity property. In this paper, assuming that requests are generated by a nearly completely decomposable Markov-modulated process, we characterize the critical cache size below which the dependency of requests dominates the cache performance. This critical cache size is small relative to the dynamics of the modulating process, and in fact is sublinear with respect to the sojourn times of the modulated chain that determines the dependence structure.


2015 ◽  
Vol 12 (3) ◽  
pp. 181-192 ◽  
Author(s):  
Pinar Yazgan ◽  
Deniz Eroglu Utku ◽  
Ibrahim Sirkeci

With the growing insurrections in Syria in 2011, an exodus in large numbers have emerged. The turmoil and violence have caused mass migration to destinations both within the region and beyond. The current "refugee crisis" has escalated sharply and its impact is widening from neighbouring countries toward Europe. Today, the Syrian crisis is the major cause for an increase in displacement and the resultant dire humanitarian situation in the region. Since the conflict shows no signs of abating in the near future, there is a constant increase in the number of Syrians fleeing their homes. However, questions on the future impact of the Syrian crisis on the scope and scale of this human mobility are still to be answered. As the impact of the Syrian crisis on host countries increases, so does the demand for the analyses of the needs for development and protection in these countries. In this special issue, we aim to bring together a number of studies examining and discussing human mobility in relation to the Syrian crisis.


2014 ◽  
Vol 11 (3) ◽  
pp. 387-390
Author(s):  
Antonina Levatino

Martin Geiger & Antoine Pécoud (eds.), Disciplining the Transnational Mobility of People, Palgrave Macmillan, 2013, 271 pp., (ISBN 978-1-137-26306-3).In the last decades a very diverse range of initiatives have been undertaken in order to intensify and diversify the ways human mobility is managed and restricted. This trend towards a ‘diversification’ of the migration control strategies stems from the increased awareness by the nation-states of the profoundly controversial nature of the migration management enterprise because of its political, economic, social and moral implications.


2018 ◽  
Vol 9 (16) ◽  
Author(s):  
Lucas Antônio Fávero ◽  
Elaine Cristina Francisco Volpato
Keyword(s):  

O presente trabalho tem por objetivo verificar alguns impactos institucionais e sociais dos movimentos migratórios na região da tríplice fronteira em Foz do Iguaçu-PR, em um contexto de even-tos climáticos catastróficos e frequentes mudanças de governos em diversos países americanos. Causa de fluxos migratórios significa-tivos de estrangeiros solicitando refugio humanitário. Diante disso, buscar-se-á compreender, primeiro, como é realizado o acolhimento dos imigrantes e dos refugiados. Após, busca-se estudar os processos de migração que formaram e transformaram a fronteira entre Brasil e Paraguai em uma das regiões mais movi-mentadas do Brasil, com um comércio forte de produtos lícitos e ilícitos. Dessa situação decorre a necessidade de que sejam elabo-radas políticas de segurança pública, especialmente pensadas para essa fronteira.


Author(s):  
Luca Scholz

Abstract: Borders and Freedom of Movement in the Holy Roman Empire tells the history of free movement in the Holy Roman Empire of the German Nation, one of the most fractured landscapes in human history. The boundaries that divided its hundreds of territories make the Old Reich a uniquely valuable site for studying the ordering of movement. The focus is on safe conduct, an institution that was common throughout the early modern world but became a key framework for negotiating free movement and its restriction in the Old Reich. The book shows that attempts to escort travellers, issue letters of passage, or to criminalize the use of ‘forbidden’ roads served to transform rights of passage into excludable and fiscally exploitable goods. Mobile populations—from emperors to peasants—defied attempts to govern their mobility with actions ranging from formal protest to bloodshed. Newly designed maps show that restrictions upon moving goods and people were rarely concentrated at borders before the mid-eighteenth century, but unevenly distributed along roads and rivers. In addition, the book unearths intense intellectual debates around the rulers’ right to interfere with freedom of movement. The Empire’s political order guaranteed extensive transit rights, but apologies of free movement and claims of protection could also mask aggressive attempts of territorial expansion. Drawing on sources discovered in more than twenty archives and covering the period between the late sixteenth to the early nineteenth century, the book offers a new perspective on the unstable relationship of political authority and human mobility in the heartlands of old-regime Europe.


Sign in / Sign up

Export Citation Format

Share Document