Operational Cost Reduction in WDM Networks using Lighttours

Wavelength division multiplexing (WDM) networks have been adopted as a near-future solution for the broadband Internet. In previous work we proposed a new architecture, named enhanced grooming (G+), that extends the capabilities of traditional optical routes (lightpaths). In this paper, we compare the operational expenditures incurred by routing a set of demands using lightpaths with that of lighttours. The comparison is done by solving an integer linear programming (ILP) problem based on a path formulation. Results show that, under the assumption of single-hop routing, almost 15% of the operational cost can be reduced with our architecture. In multi-hop routing the operation cost is reduced in 7.1% and at the same time the ratio of operational cost to number of optical-electro-optical conversions is reduced for our architecture. This means that ISPs could provide the same satisfaction in terms of delay to the end-user with a lower investment in the network architecture

Label Space Reduction in MPLS Networks: How Much Can A Single Stacked Label Do?

Most network operators have considered reducing LSR label spaces (number of labels used) as a way of simplifying management of underlaying virtual private networks (VPNs) and therefore reducing operational expenditure (OPEX). The IETF outlined the label merging feature in MPLS-allowing the configuration of multipoint-to-point connections (MP2P)-as a means of reducing label space in LSRs. We found two main drawbacks in this label space reduction a)it should be separately applied to a set of LSPs with the same egress LSR-which decreases the options for better reductions, and b)LSRs close to the edge of the network experience a greater label space reduction than those close to the core. The later implies that MP2P connections reduce the number of labels asymmetrically

QFT control for vibration reduction in structures equipped with MR dampers

This short paper addresses the problem of designing a QFT (quantitative feedback theory) based controllers for the vibration reduction in a 6-story building structure equipped with shear-mode magnetorheological dampers. A new methodology is proposed for characterizing the nonlinear hysteretic behavior of the MR damper through the uncertainty template in the Nichols chart. The design procedure for QFT control design is briefly presented

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Reduction Formula

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Factors associated to avascular necrosis of the femoral head and non-union in patients younger than 65 years old with displaced femoral neck fractures treated with reduction and internal fixation.

Pocos estudios han evaluado el tratamiento de las fracturas desplazadas de cuello femoral en pacientes menores de 65 años de edad, y no han sido claramente definidos los factores de riesgo para necrosis avascular o no-unión dentro de este rango de edad. Para determinar los factores asociados a la necrosis avascular de la cabeza femoral (AVN) y no-unión en pacientes menores de 65 años de edad con fracturas desplazadas del cuello femoral tratados con reducción y fijación interna, se realizó un estudio retrospectivo de 29 fracturas desplazadas del cuello femoral en 29 pacientes consecutivos tratados en una sola institución. La influencia de la edad, la energía del trauma, tipo de reducción, y el tiempo entre la fractura y el tratamiento en desarrollo de la AVN y no-unión fueron evaluados. Los pacientes que desarrollaron NAV fueron significativamente mayores y sufrieron un trauma de más baja energía que en los casos sin AVN. Ninguna variable fue asociada con la no-unión. La regresión logística determinó que sólo la edad se asoció de forma independiente a NAV. La edad es un buen predictor para el desarrollo de NAV, con un C-estadístico de 0.861, y un mejor corte-determinado en 53,5 años. Conclusión: Los pacientes de entre 53,5 y 65 años presentan un riesgo más alto de NAV. La artroplastia primaria se debe considerar en este subgrupo.

Identification of plasmodium vivax proteins with potential role in invasion using sequence redundancy reduction and profile hidden markov models

Background: This study describes a bioinformatics approach designed to identify Plasmodium vivax proteins potentially involved in reticulocyte invasion. Specifically, different protein training sets were built and tuned based on different biological parameters, such as experimental evidence of secretion and/or involvement in invasion-related processes. A profile-based sequence method supported by hidden Markov models (HMMs) was then used to build classifiers to search for biologically-related proteins. The transcriptional profile of the P. vivax intra-erythrocyte developmental cycle was then screened using these classifiers. Results: A bioinformatics methodology for identifying potentially secreted P. vivax proteins was designed using sequence redundancy reduction and probabilistic profiles. This methodology led to identifying a set of 45 proteins that are potentially secreted during the P. vivax intra-erythrocyte development cycle and could be involved in cell invasion. Thirteen of the 45 proteins have already been described as vaccine candidates; there is experimental evidence of protein expression for 7 of the 32 remaining ones, while no previous studies of expression, function or immunology have been carried out for the additional 25. Conclusions: The results support the idea that probabilistic techniques like profile HMMs improve similarity searches. Also, different adjustments such as sequence redundancy reduction using Pisces or Cd-Hit allowed data clustering based on rational reproducible measurements. This kind of approach for selecting proteins with specific functions is highly important for supporting large-scale analyses that could aid in the identification of genes encoding potential new target antigens for vaccine development and drug design. The present study has led to targeting 32 proteins for further testing regarding their ability to induce protective immune responses against P. vivax malaria.

Aplicaciones tutoriales y de aula de MS-WORKS

Manual dirigido al profesorado y alumnado de Ense??anzas Medias, conocimientos b??sicos del sistema operativo MS-DOS y de un procesador de textos. El enfoque de la obra es pragm??tico y por ello se basa en ejercicios pr??cticos, dando prioridad a la preparaci??n de documentos que tengan un fin determinado. El libro consta de cuatro cap??tulos y un ap??ndice. 1. Primeros pasos en WORKS. 2. El procesador de textos de WORKS. 3. La base de datos de WORKS. 4. La hoja de c??lculo de WORKS. Ap??ndice.

Works Councils: An Agency Perspective

This paper investigates the role of works councils in a simple agency framework in whichworks councils are supposed to monitor manager's information on behalf of the workforce,but they are independent agents who might pursue their private interest. First, we considerthat workers can incentivize works councils through contingent monetary payments. In orderto deter collusion, workers must pay higher compensations in states of nature where they canbe expropriated by potential coalitions among works councils and management. Collusionmakes contingent payments costly and reduces workers' payoffs. Second, when elections areused to align works councils' interest only well compensated representatives would face aninter-temporal trade-off between accepting management's transfers at first period and losingrents at the second period. Elections increase the cost of entering on collusive behaviour withmanagement and works councils will try to behave on the employees' interest.

Works councils: an agency perspective

This paper investigates the role of works councils in a simple agency framework in which works councils are supposed to monitor manager’s information on behalf of the workforce, but they are independent agents who might pursue their private interest. First, we consider that workers can incentivize works councils through contingent monetary payments. In order to deter collusion, workers must pay higher compensations in states of nature where they can be expropriated by potential coalitions among works councils and management. Collusion makes contingent payments costly and reduces workers’ payoffs. Second, when elections are the exclusive mechanisms to align works councils’ interest, only well compensated representatives would face an intertemporal tradeoff between accepting management’s transfers at first period and losing rents at the second period. Elections increase the cost of entering on collusive behavior with management and works councils will try to behave on the employees’ interest.

Educational access and poverty reduction : the case of Ghana 1991-2006. 'Acceso a la educación y reducción de la pobreza: el caso de Ghana : 1991-2006'.

Resumen basado en el de la publicación

Teaching secondary how science works.

El propósito de este libro es ayudar a los profesores a cumplir con los enunciados incluidos en la última versión del curriculo nacional en ciencias. Para ello, pone de relieve varios elementos que forman parte de cómo trabajar con la ciencia y que los maestros deben entender y enseñar: datos, pruebas, teorías y explicaciones, habilidades para la comunicación y aplicaciones e implicaciones de la ciencia. Cumple con los requisitos para la enseñanza de la ciencia en secundaria. Se acompaña de un CD-ROM con hojas de trabajo para los alumnos.

What really works in special and inclusive education : using evidence-based teaching strategies.

En este manual se presentan una serie de estrategias que los educadores pueden implementar en el aula con alumnos con necesidades educativas especiales, con el objetivo de ayudarles a tener un aprendizaje de calidad y buenos resultados sociales. Cada una de las veinticuatro estrategias incluidas en el manual tiene una base sustancial de investigación, una justificación teórica, directrices prácticas sobre cómo puede emplearse, así como consejos sobre su uso. Si bien el libro se centra en alumnos con necesidades educativas especiales, la mayor parte de las estrategias son aplicables a todos los alumnos.

Exploring Science : How science works.

El objetivo de este libro es ayudar a los profesores de ciencias de enseñanza secundaria a enseñar al amplio rango de estudiantes que se encuentran en sus clases. El libro contiene un CD con ejercicios y glosario de términos. Los temas son: Biología (Cromosomas, los genes y el medio ambiente, los diferentes animales y plantas, los problemas de la agricultura) ,Química (Construyendo un futuro, parque de esculturas, polución, lluvia ácida, el debate del cambio climático, un esfuerzo mundial) y Física (Poder y energía, gravedad en el espacio, gravedad y peso, satélites y espacio).

Edexcel A2 Unit 4 Psychology : how psychology works.

Guía de apoyo para alumnos de educación secundaria de segundo ciclo que sigan la especificación de Edexcel en el nivel A2 del área de psicología. Está estructurada en tres secciones: una introducción sobre cómo usar el libro y con consejos para la realización del examen; una guía de contenidos con los conceptos y temas básicos de la psicología clínica, y un apartado con cuestiones para debatir; y una sección con preguntas tipo examen y respuestas comentadas por un examinador.