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Gustavo A. Madero, Mexico

Wu J.,Louisiana State University | Gaytan E.A.A.,Technological Institute of Nuevo Leon
European Journal of Information Systems | Year: 2013

Third-party interpersonal communications such as online seller reviews play an important role in buyers' purchase decisions in online markets. Although it is empirically clear that seller reviews (volume and valence) and product price contribute to buyers' willingness-to-pay (WTP) differently across various studies, it is theoretically less understood why such effects qualitatively differ (e.g., positive vs negative), rendering unclear managerial implications for online marketers. In this paper, we study the role of online seller reviews and product price in buyers' WTP. We offer a conceptual framework from a risk perspective in which we argue that the different effects of seller reviews and product price on buyers' WTP may emerge simultaneously in an online market. We highlight two important drivers for such qualitatively different effects: a difference in buyers' risk attitudes (averse, neutral, or seeking) and a difference in WTP measures (absolute or relative). We test our hypotheses and find good support for them both internally (an experimental study) and externally (an empirical study). Our research enhances the understanding of the relationship between online user reviews and online price dispersions while shedding light on better management of online user reviews for market makers. © 2013 Operational Research Society Ltd. Source


Lucio-Nieto T.,Technological Institute of Nuevo Leon | Colomo-Palacios R.,Charles III University of Madrid | Soto-Acosta P.,University of Murcia | Popa S.,University of Murcia | Amescua-Seco A.,Charles III University of Madrid
International Journal of Information Management | Year: 2012

It is evident that organizations are demanding more efficient information management technologies in order to offer high quality services for both internal and external clients. Firms pursue the implementation of processes aligned to their strategic and operational objectives and, to achieve these goals, they usually introduce various frameworks and approaches to information technology service management, such as Information Technology Infrastructure Library (ITIL) or Control Objectives for Information and Related Technologies (COBIT). However, once incorporated, it is essential to have mechanisms that guarantee performance efficiency. One of such mechanism is the Service Management Office (SMO). The case analysis presented here describes the lessons learned from its implementation in COTEMAR. The results provide useful insights for firms interested in integrating SMO within IT service management practices. © 2012 Elsevier Ltd. All rights reserved. Source


Villela L.,Technological Institute of Nuevo Leon | Bolanos-Meade J.,Johns Hopkins University
Drugs | Year: 2011

The current treatment of patients with acute myeloid leukaemia yields poor results, with expected cure rates in the order of 3040 depending on the biological characteristics of the leukaemic clone. Therefore, new agents and schemas are intensively studied in order to improve patients outcomes. This review summarizes some of these new paradigms, including new questions such as which anthracycline is most effective and at what dose. High doses of daunorubicin have shown better responses in young patients and are well tolerated in elderly patients. Monoclonal antibodies are promising agents in good risk patients. Drugs blocking signalling pathways could be used in combination with chemotherapy or in maintenance with promising results. Epigenetic therapies, particularly after stem cell transplantation, are also discussed. New drugs such as clofarabine and flavopiridol are reviewed and the results of their use discussed. It is clear that many new approaches are under study and hopefully will be able to improve on the outcomes of the commonly used '73' regimen of an anthracycline plus cytarabine with daunorubicin, which is clearly an ineffective therapy in the majority of patients. © 2011 Adis Data Information BV. All Rights Reserved. Source


Ramon-Fox F.G.,Technological Institute of Nuevo Leon | Sada P.V.,University of Monterrey
Revista Mexicana de Astronomia y Astrofisica | Year: 2013

Four transits of the exoplanet HAT-P-23b were recently observed with the 0.36 m telescope at the Universidad de Monterrey Observatory. The four light curves were successfully combined to obtain a resulting one with reduced scat- tering per bin. This curve was modeled using a Monte Carlo method to obtain the essential parameters that characterize the system. Assuming orbital param- eters such as eccentricity e and longitude of periastron ω from the discovery pa- per, we found values of Rp/R* = 0.1105+0.0015 -0.0013 for the planet-to-star radius ratio, a/R* = 4.23+0.06 -0.12 for the scaled semimajor axis, and an orbital inclination of the system of i = 87.9°+1.5 -2.2. We also derive an improved orbital period of 1.2128868 ± 0.0000004 days (To = 2, 454, 852.26542 ± 0.00018 BJD TDB) for the system. © Copyright 2013: Instituto de Astronomía, Universidad Nacional Autónoma de México. Source


Pacheco J.,University of Burgos | Angel-Bello F.,Technological Institute of Nuevo Leon | Alvarez A.,Autonomous University of Nuevo Leon
Journal of Scheduling | Year: 2013

In this paper we study a problem of sequencing jobs in a machine with programmed preventive maintenance and sequence-dependent set-up times. The problem combines two NP-hard problems, so we propose a heuristic method for solving it, which hybridizes multi-start strategies with Tabu Search. We compare our method with the only published metaheuristic algorithm for this problem on a set of 420 instances. The comparison favors the method developed in this work, showing that is able to find high quality solutions in very short computational times. © 2012 Springer Science+Business Media, LLC. Source

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