Technology and market conditions toward a new competitive landscape in the wireless access market

This article argues that the wireless telecommunication market is about to witness a shift in business models and market structure as a result of the deployment of new broadband access technologies, spectrum management techniques, policy-based network management, and the drive of new entrants to compete against the incumbents. The article discusses four agents of evolutionary changes: a range of broadband wireless access standards and technologies that are frontrunners in the industry’s efforts to embody the next generation of wireless networks; new provider-customer relationships facilitated through changes in the usual contract patterns that will allow consumers to enter short-term and spot contracts with the new wireless providers; an overview of the current debate on spectrum management; and an explanation of how autonomic communications and policybased management would support the new structure. Finally, the article asserts the necessity for the integration of the heterogeneous technologies that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of a new competitive scenario.Postprint (published version

How evolving network access and network management technologies are redefining the competitive wireless markets

This paper examines some of the key problems users encounter when accessing current generation wireless networks. Using a case study of a hypothetical user, the authors explore the emerging services and the new broadband wireless network technologies necessary to carry them out. This paper analyses the issues associated with an observed trend in the industry that exposes potential changes to the long-term, rigid commercial relation between wireless providers and users: as a result of a range of evolved broadband wireless access standards and technologies, autonomic communications and policy-based management, and new pricing schemes, consumers will likely face new opportunities to enter short-term and spot contracts with the new wireless providers. This new landscape also allow multiple competing Access Providers (APs) to dynamically assign prices, and poses new and interesting challenges to the regulatory function. The paper also discusses a framework for the integration of heterogeneous technologies and mana ment policies based on the network context that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of new markets likely to arise.Postprint (published version

Role of Physical Activity and Fitness in the Characterization and Prognosis of the Metabolically Healthy Obesity Phenotype: a Systematic Review and Meta-Analysis

The aims of the present article are to systematically review and meta-analyze the existing evidence on: 1) differences in physical activity (PA), sedentary behavior (SB), cardiorespiratory fitness (CRF) and muscular strength (MST) between metabolically healthy obesity (MHO) and metabolically unhealthy obesity (MUO); and 2) the prognosis of all-cause mortality and cardiovascular disease (CVD) mortality/morbidity in MHO individuals, compared with the best scenario possible, i.e., metabolically healthy normal-weight (MHNW), after adjusting for PA, SB, CRF or MST. Our systematic review identified 67 cross-sectional studies to address aim 1, and 11 longitudinal studies to address aim 2. The major findings and conclusions from the current meta-analysis are: 1) MHO individuals are more active, spend less time in SB, and have a higher level of CRF (yet no differences in MST) than MUO individuals, suggesting that their healthier metabolic profile could be at least partially due to these healthier lifestyle factors and attributes. 2) The meta-analysis of cohort studies which accounted for PA (N = 10 unique cohorts, 100% scored as high-quality) support the notion that MHO individuals have a 24-33% higher risk of all-cause mortality and CVD mortality/morbidity compared to MHNW individuals. This risk was borderline significant/non-significant, independent of the length of the follow-up and lower than that reported in previous meta-analyses in this topic including all type of studies, which could be indicating a modest reduction in the risk estimates as a consequence of accounting for PA. 3) Only one study has examined the role of CRF in the prognosis of MHO individuals. This study suggests that the differences in the risk of all-cause mortality and CVD mortality/morbidity between MHO and MHNW are largely explained by differences in CRF between these two phenotypes

XVI International Congress of Control Electronics and Telecommunications: "Techno-scientific considerations for a post-pandemic world intensive in knowledge, innovation and sustainable local development"

Este título, sugestivo por los impactos durante la situación de la Covid 19 en el mundo, y que en Colombia lastimosamente han sido muy críticos, permiten asumir la obligada superación de tensiones sociales, políticas, y económicas; pero sobre todo científicas y tecnológicas. Inicialmente, esto supone la existencia de una capacidad de la sociedad colombiana por recuperar su estado inicial después de que haya cesado la perturbación a la que fue sometida por la catastrófica pandemia, y superar ese anterior estado de cosas ya que se encontraban -y aún se encuentran- muchos problemas locales mal resueltos, medianamente resueltos, y muchos sin resolver: es decir, habrá que rediseñar y fortalecer una probada resiliencia social existente - producto del prolongado conflicto social colombiano superado parcialmente por un proceso de paz exitoso - desde la tecnociencia local; como lo indicaba Markus Brunnermeier - economista alemán y catedrático de economía de la Universidad de Princeton- en su libro The Resilient Society…La cuestión no es preveerlo todo sino poder reaccionar…aprender a recuperarse rápido.This title, suggestive of the impacts during the Covid 19 situation in the world, and which have unfortunately been very critical in Colombia, allows us to assume the obligatory overcoming of social, political, and economic tensions; but above all scientific and technological. Initially, this supposes the existence of a capacity of Colombian society to recover its initial state after the disturbance to which it was subjected by the catastrophic pandemic has ceased, and to overcome that previous state of affairs since it was found -and still is find - many local problems poorly resolved, moderately resolved, and many unresolved: that is, an existing social resilience test will have to be redesigned and strengthened - product of the prolonged Colombian social conflict partially overcome by a successful peace process - from local technoscience; As Markus Brunnermeier - German economist and professor of economics at Princeton University - indicates in his book The Resilient Society...The question is not to foresee everything but to be able to react...learn to recover quickly.Bogot

How evolving network access and network management technologies are redefining the competitive wireless markets

This paper examines some of the key problems users encounter when accessing current generation wireless networks. Using a case study of a hypothetical user, the authors explore the emerging services and the new broadband wireless network technologies necessary to carry them out. This paper analyses the issues associated with an observed trend in the industry that exposes potential changes to the long-term, rigid commercial relation between wireless providers and users: as a result of a range of evolved broadband wireless access standards and technologies, autonomic communications and policy-based management, and new pricing schemes, consumers will likely face new opportunities to enter short-term and spot contracts with the new wireless providers. This new landscape also allow multiple competing Access Providers (APs) to dynamically assign prices, and poses new and interesting challenges to the regulatory function. The paper also discusses a framework for the integration of heterogeneous technologies and mana ment policies based on the network context that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of new markets likely to arise

Lifetime-aware networks. It is not what you know but who you know

In this paper, we investigate the problem of managing the lifetime in backbone networks by imposing sleep mode (SM) states to network devices. When a device enters a SM, its lifetime is increased. However, the transition between SM and full power tends to reduce the lifetime. We study this tradeoff by evaluating an energy-aware algorithm which manages the link power states in backbone networks. More in-depth, we exploit the different topologies and different time granularities for applying the SM decisions, showing that both aspects impact on the network lifetime performance. In particular, the network lifetime is not merely a function of hardware failure rate and SMs parameters, but it is also a network-wide activity that has to be carefully managed. The extensive simulation studies have confirmed that the underlying topological characteristic is one of the sensitive factors significantl

Technology and market conditions toward a new competitive landscape in the wireless access market

This article argues that the wireless telecommunication market is about to witness a shift in business models and market structure as a result of the deployment of new broadband access technologies, spectrum management techniques, policy-based network management, and the drive of new entrants to compete against the incumbents. The article discusses four agents of evolutionary changes: a range of broadband wireless access standards and technologies that are frontrunners in the industry’s efforts to embody the next generation of wireless networks; new provider-customer relationships facilitated through changes in the usual contract patterns that will allow consumers to enter short-term and spot contracts with the new wireless providers; an overview of the current debate on spectrum management; and an explanation of how autonomic communications and policybased management would support the new structure. Finally, the article asserts the necessity for the integration of the heterogeneous technologies that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of a new competitive scenario

How evolving network access and network management technologies are redefining the competitive wireless markets

This paper examines some of the key problems users encounter when accessing current generation wireless networks. Using a case study of a hypothetical user, the authors explore the emerging services and the new broadband wireless network technologies necessary to carry them out. This paper analyses the issues associated with an observed trend in the industry that exposes potential changes to the long-term, rigid commercial relation between wireless providers and users: as a result of a range of evolved broadband wireless access standards and technologies, autonomic communications and policy-based management, and new pricing schemes, consumers will likely face new opportunities to enter short-term and spot contracts with the new wireless providers. This new landscape also allow multiple competing Access Providers (APs) to dynamically assign prices, and poses new and interesting challenges to the regulatory function. The paper also discusses a framework for the integration of heterogeneous technologies and mana ment policies based on the network context that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of new markets likely to arise

Fenomenología del modelo izquierdo derecho supersimétrico

IP 1101-05-11395Incluye anexos.particulas / M.A. Acero, Roberto Martinez. -- En: RevistaColombiana de Fisica. -- Vol. 35, no. 2 (2003) ; p.;411-415. -- El grupo de renormalizacion en el modelo Standard/D. Gallego, Roberto Martinez. -- En: Revista;Colombiana de Fisica. -- Vol. 35, no. 2 (2003) ; p. 415-418. --Supersymetric SU(3)L O U(1)x gauge models /;Roberto Martinez, Alexis Rodriguez. -- En: Revista ColombianadeFisica. -- Vol. 35, no. 2 (2003) ; p.;419-422. -- Validez del teorema de equivalencia en metodosno-perturbativos / Jhon Morales, Rafael Hurtado,;Roberto Martinez. -- En: Revista Colombiana de Fisica. --Vol.35, no. 2 (2003) ; p. 419-423. -- Decaimiento;del T- en el limite fermiofobico del modelo de dos dobletes dehiggs tipoIII / Rodolfo A. Diaz, Roberto;Martinez, Carlos E. Sandoval. -- En: Revista Colombiana deFisica. -- Vol.35, no. 2 (2003) ; p. 426-429. --;Bounds on charged higgs boson in the 2hdm III / J.m.F. Guevara,Roberto Martinez, Alexis Rodriguez. -- En:;Revista Colombiana de Fisica. -- Vol. 35, no. 2 (2003) ; p. 430433. -- Correccion al vertice no universal W;'--- Tvr a traves de una teoria efectiva de fermiones compuestos/ RodolfoA. Diaz, Roberto Martinez, Alexis;Rodriguez, O.A. Sampayo. -- En: Revista Colombiana de Fisica.--Vol. 34,no. 1 (2002) ; p. 315-318. --;Violacion espontanea de r-paridad en un modelo susy con fermiones espejos/ Rodolfo A. Diaz, Roberto Martinez,;Alexis Rodriguez, E. Tuiran. -- En: Revista Colombiana deFisica. -- Vol.34, no. 1 (2002) ; p. 319-322. -- El;majorron en modelos mas alla del modelo atandard / RodolfoA.Diaz, Roberto Martinez, Alexis Rodriguez. -- EN:;Revista Colombiana de Fisica. -- Vol. 34, no. 1 (2002) ; p. 32-3326. -- restricciones a los vertices con;cambio de sabor y la masa del higgs pseudoescalar en el modelogeneral delos dobletes tipo III por medio del;factor g-2 del muon / Rodolfo A. Diaz, Roberto Martinez, AlexisRodriguez.'-- en: Revista colombiana de;(g-2)u and leptonic decays / Rodolfo A. Diaz, Roberto Martinez,Alexis rodriguez. -- En: Physical Review . --;Vol. 67, (2003) ; p. 1-7. -- Upper bound of lightest higssbosonin a supersymmetric S U(3)LOU(1)x gauge model;/ Roberto Martinez, N. Poveda, Alexis Rodriguez. -- En: PhysicalReview. -- Vol. 69, (2004) ; p.1-6. --;ARTICULO(S) EN REVISTA: Phenomenology of lepton flavor violationin to higgs doublet model type III from;Fisica. -- Vol. 34, no. 1 (2002) ; p. 327-330. -- Contributionof neutrinosinglet to the invisible Z decay /;Rodolfo A. Diaz, Roberto Martinez, F. Naranjo, Alexis Rodriguez.'-- en: Revista Colombiana de Fisica. -- Vol.;34, no. 1 (2002) ; p. 331-334. -- El decaimiento t -- cy en elmarco del modelo de dos dobletes de higgs con;cambio de sabor / Rodolfo A. Diaz, Roberto Martinez, Alexis Rodriguez. --En: Revista Colombiana de Fisica.--;Vol. 34, no. 1 (2002); p. 335-337.;Anomalous chrmomagnetic dipole moment of the top quark inthestandard model and beyond / Roberto Martinez,;Alexis Rodriguez. En: Physical Review. -- Vol. 65 (2002) ;p.-14. -- SU(3)cOSU(3)LOU(1)x as an SU(6)OU(1)x;subgroup / Roberto Martinez, William A. Ponce, Luis A. Sanchez.'-- en: Physical Review. -- Vol. 65 (2002) ;p. 1-11. -- Bounds on the charged higgs boson in the typeIIItwo higgs doublet model from the fermilab;tevatron / Roberto Martinez, Alexis Rodriguez, M. Rozo. --En:Physical Review. -- Vol. 68 (2003) ; p. 1-6.; A new supersymmetric SU(3)L O U(1)x gauge model / Rodolfo A.Diaz, Roberto Martinez, J. Mira, Alexis;Rodriguez. -- En: Physics Letters B. -- No. 552 (2003) ;p. 287-292. -- Excited tau lepton contribution to w;Tvt decay at the one loop level / Rodolfo A. Diaz, RobertoMartinez. -- En: Modern Physics Letters A. -- Vol.;17, no. 35 (2002) ; p. 2327-2333. -- Cambios de sabor en un modelo con dosdobletes de higgs / Roberto;Martinez, N. Poveda, Rodolfo A, Diaz. -- En: Revista Colombianade Fisica.-- Vol. 35, no. 1 (2003) ; p.;222-225. -- Unitariedad en el limite de gran N / Rafael Hurtado,John Morales, Roberto Martinez. -- En:;Revista Colombiana de Fisica. -- Vol. 35, no. 1 (2003) ; p. 23-4238. -- Procesos de dispersion de do

Lifetime-aware ISP networks. Optimal formulation and solutions

We propose a framework to manage the link lifetime in an IP backbone network by exploiting the sleep mode (SM). In particular, when an SM feature is available, two different effects coexist: 1) during the SM state, the lifetime tends to be increased and 2) however, when the link changes its power state (from SM to full power or vice-versa), the lifetime tends to be decreased. We, therefore, define an optimal formulation of the lifetime-aware network problem. Moreover, we propose a heuristic, called Acceleration Factor Algorithm, to practically manage the device lifetime. We solve the problem both optimally and with our heuristic, considering two representative case studies. Results show that our approach outperforms the previous energy-aware algorithms, which instead do not consider the lifetime decrease triggered by the power state change. Thus, we argue that a lifetime-aware network management should be pursued when deciding to set an SM state for each device in an Internet Service Provider network