Supporting Massive Mobility with stream processing software

The goal of this project is to design a solution for massive mobility using LISP protocol and scalable database systems like Apache Kafka. The project consists of three steps: rst, understanding the requirements of the massive mobility scenario; second, designing a solution based on a stream processing software that integrates with OOR (open-source LISP implementation). Third, building a prototype with OOR and a stream processing software (or a similar technology) and evaluating its performance. Our objectives are: Understand the requirements in an environment for massive mo- bility;Learn and evaluate the architecture of Apache Kafka and similar broker messages to see if these tools could satisfy the requirements; Propose an architecture for massive mobility using protocol LISP and Kafka as mapping system, and nally; Evaluate the performance of Apache Kafka using such architecture. In chapters 3 and 4 we will provide a summary of LISP protocol, Apache Kafka and other message brokers. On these chapters we describe the components of these tools and how we can use such components to achieve our objective. We will be evaluating the di erent mechanisms to 1) authenticate users, 2) access control list, 3) protocols to assure the delivery of the message, 4)integrity and 5)communication patterns. Because we are interested only in the last message of the queue, it is very important that the broker message provides a capability to obtain this message. Regarding the proposed architecture, we will see how we adapted Kafka to store the information managed by the mapping system in LISP. The EID in LISP will be repre- sented by topics in Apache Kafka., It will use the pattern publish-subscribe to spread the noti cation between all the subscribers. xTRs or Mobile devices will be able to play the role of Consumers and Publisher of the message brokers. Every topic will use only one partition and every subscriber will have its own consumer group to avoid competition to consume the messages. Finally we evaluate the performance of Apache Kafka. As we will see, Kafka escalates in a Linear way in the following cases: number of packets in the network in relation with the number of topics, number of packets in the network in relation with the number of subscribers, number of opened les by the server in relation with the number of topics time elapsed between the moment when publisher sends a message and subscriber receives it, regarding to the number of topics. In the conclusion we explain which objectives were achieved and why there are some challenges to be faced by kafka especially in two points: 1) we need only the last location (message) stored in the broker since Kafka does not provide an out of the box mechanism to obtain such messages, and 2) the amount of opened les that have to be managed simultaneously by the server. More study is required to compare the performance of Kafka against other tools

Content Delivery and Sharing in Federated Cloud Storage

Cloud-based storage is becoming a cost-effective solution for agencies, hospitals, government instances and scientific centers to deliver and share contents to/with a set of end-users. However, reliability, privacy and lack of control are the main problems that arise when contracting content delivery services with a single cloud storage provider. This paper presents the implementation of a storage system for content delivery and sharing in federated cloud storage networks. This system virtualizes the storage resources of a set of organizations as a single federated system, which is in charge of the content storage. The architecture includes a metadata management layer to keep the content delivery control in-house and a storage synchronization worker/monitor to keep the state of storage resources in the federation as well as to send contents near to the end-users. It also includes a redundancy layer based on a multi-threaded engine that enables the system to withstand failures in the federated network. We developed a prototype based on this scheme as a proof of concept. The experimental evaluation shows the benefits of building content delivery systems in federated cloud environments, in terms of performance, reliability and profitability of the storage space.The work presented in this paper has been partially supported by EU under the COST programme Action IC1305, Network for Sustainable Ultrascale Computing (NESUS)

Computational buckling analysis of cylindrical panels under uniform pressure

En este trabajo se investiga una metodología de energía reducida para calcular el límite inferior de carga de pandeo de paneles cilíndricos rebajados. La formulación de esta nueva metodología está basada en los postulados establecidos en la literatura para el cálculo de límites inferiores de carga de pandeo y se ha implementado en un programa de elementos finitos de aplicaciones múltiples. Se han analizado paneles formados de material isotrópico y caracterizados por tres valores del parámetro de Batdorf. De la comparación de los resultados obtenidos con la metodología propuesta con aquellos obtenidos de análisis no lineales incluyendo diferentes niveles de imperfección geométrica, surge que el modelo de energía reducida aplicado a paneles cilíndricos no conduce a límites inferiores de carga de pandeo. Si bien este nuevo modelo de energía reducida predice cargas de pandeo inferiores a las obtenidas del análisis clásico, éstas son mayores que las obtenidas de análisis no lineales. Sin embargo, la viabilidad de la implementación de una metodología de energía reducida en un programa de elementos finitos de aplicaciones múltiples queda demostrada.Peer Reviewe

Cooling Average Potential of Evaporative Cooling System in Dry Warm Climate

AbstractThe high summer temperatures, high solar radiation and common inadequate thermal design of buildings obliges the occupants to recur to the use cooling equipment such as evaporative air-conditioning to achieve acceptable levels of habitability. Evaporative cooling systems require considerable electric energy and a significant constant clean water supply during operation. Therefore, this paper presents the results of a field study aims to quantify in this kind of weather, the potential cooling means having the following strategies: indirect evaporative cooling and shading devices; indirect evaporative cooling, shading devices and thermal mass; indirect evaporative cooling, solar protection, thermal mass and nocturnal radiative cooling; indirect evaporative cooling, thermal insulation and nocturnal radiative cooling; and finally indirect evaporative cooling, thermal insulation, thermal mass and nocturnal radiative cooling. The method consisted of measuring the reduction in air temperature is achieved with each of these cooling strategies, applied in three research modules of same construction features, orientation and dimensions during the summer 2012.Then quantified the cooling average potential by the method proposed by Dr. Eduardo Gonzalez (1989). Finally registration was the water consumption with each of these strategies and estimated required consumption by direct evaporative cooling to achieve the same cooling potential. The results obtained indicate that the IEC/TI/NRC had cooling potential of 822.89 Wh/m2day, followed IEC/SP with 764.19 Wh/m2day and finally IEC/SP+TM 568.60 Wh/m2day

FACTORES DE RIESGO PARA PARTO PRETERMINO EN GESTANTES DEL HOSPITAL PROVINCIAL DOCENTE BELEN DE LAMBAYEQUE

El nacimiento pretérmino es la mayor causa de morbilidad y mortalidad neonatal y responsable de 75 a 90% de las muertes neonatales no relacionadas con malformaciones congénitas. Determinar los factores de riesgo del parto pretérmino en el Hospital Provincial Docente Belén de Lambayeque durante el año enero-diciembre 2010. El presente estudio es analítico, de casos y controles pareados de tipo retrospectivo, descriptivo comparativo, trasversal en el que se analizaron las historias clínicas de nacimientos pretérmino (casos: n = 80) atendidos de enero-diciembre 2010, los controles se seleccionaron al azar de las historias clínicas de pacientes con nacimientos a término (n = 160). Se analizó la asociación de nacimiento pretérmino con factores preconcepcional y gestacionales. Como resultados tenemos que los escasos controles prenatales presentaron OR: 9.13 (3.51-23.7) p: 0.0000, la anemia (concentración de hemoglobina <11 gr/dl) , OR: 1.79 (1.02-3.15) p: 0.0407; y el antecedente de parto pretérmino OR: 2.12 (1.03-4.40) P: 0.0385, fueron factores preconcepcional de riesgo para parto pretérmino, así como la infección del tracto urinario OR: 2.68 (1.54-4.67); p: 0,0004; la rotura prematura de membranas OR: 7.22 (3.26-15.95) p: 0,0000; el embarazo múltiple OR: 11.28 (2.40-52.85); p: 0.0002; y el oligohidramnios OR: 17.66 (2.16-143.8); P: 0.0003; son factores de riesgo gestacional elevado para parto pretérmino

The anatomy of behavioral responses to social assistance when informal employment is high

The disincentive effects of social assistance programs on registered employment are a first order policy concern in developing countries. Means tests determine eligibility with respect to some income threshold, and governments can only verify earnings from registered employment. The loss of benefit at some level of formal earnings is an implicit tax that results in a strong disincentive for formal employment. We study an income-tested program in Uruguay and extend previous literature by developing an anatomy of the behavioral responses to this program. Our identification strategy is based on a sharp discontinuity in the program?s eligibility rule and uses information from the program?s records, social security administration data, and a follow-up survey. First, we establish that beneficiaries respond to the program?s incentives by reducing their levels of registered employment by about 8 percentage points. Second, we find the program induces a larger reduction of formal employment for individuals with a medium probability to be a registered employee, suggesting some form of segmentation ? those with a low propensity to work formally do not respond to the financial incentives of the program. Third, we find evidence that the fall in registered employment is due to a larger extent to an increase in unregistered employment, and to a lesser extent to a shift towards non employment. Fourth, we find an elasticity of participation in registered employment of about 1.7, implying a deadweight loss from the behavioral responses to the program of about 3.2% of total registered labor income.Fil: Bergolo Sosa, Marcelo Luis. Universidad Nacional de La Plata. Facultad de Ciencias Económicas. Departamento de Ciencias Económicas. Centro de Estudios Distributivos Laborales y Sociales; ArgentinaFil: Cruces, Guillermo Antonio. Universidad Nacional de La Plata. Facultad de Ciencias Económicas. Departamento de Ciencias Económicas. Centro de Estudios Distributivos Laborales y Sociales; Argentin

Evaluation of Production Lines of Lima Beans (Phaseolus lunatus), Grown in Home Gardens

This study was made to evaluate the behavior of P. lunatus grown in home gardens for family consumption, in areas of the Local Administrative Council, in Senado, Camaguey, Cuba. The areas used belong to the Noel Fernández Agricultural Company, in the municipality of Minas, on brown carbonated soils. Six varieties of Phaseolus lunatus were evaluated. Variety "bola roja" (red ball) was the most affected variety (3.21 t/ha). P. lunatus Caballero rojo aplanado was not affected by pests.&nbsp

Characterization of a radiator of eight arms with circular polarization

The cross antenna is a printed structure of average profile and circular polarization, which consists of a conductor or tape on a ground plane that follows the contour of a cross with four or more arms and a diameter of about 1.5 wavelengths developed by Antoine Roederer. The antenna is feeded by means of a coaxial line and is finished in an impedance of load, for what it is represented by a behavior of travelling wave. Though in principle the antenna was designed for applications in mobile communications in Band L (1500 MHhz), we present in this work the experimental characterization of an antenna of cross of eight arms that is employed at 10 GHz, with the principal intention of serving as feeder of a parabolic reflector for satellite communications

Critical parameters of the in vitro method of vascular smooth muscle cell calcification

[Background]: Vascular calcification (VC) is primarily studied using cultures of vascular smooth muscle cells. However, the use of very different protocols and extreme conditions can provide findings unrelated to VC. In this work we aimed to determine the critical experimental parameters that affect calcification in vitro and to determine the relevance to calcification in vivo. [Experimental Procedures and Results]: Rat VSMC calcification in vitro was studied using different concentrations of fetal calf serum, calcium, and phosphate, in different types of culture media, and using various volumes and rates of change. The bicarbonate content of the media critically affected pH and resulted in supersaturation, depending on the concentration of Ca2+ and Pi. Such supersaturation is a consequence of the high dependence of bicarbonate buffers on CO2 vapor pressure and bicarbonate concentration at pHs above 7.40. Such buffer systems cause considerable pH variations as a result of minor experimental changes. The variations are more critical for DMEM and are negligible when the bicarbonate concentration is reduced to ¿. Particle nucleation and growth were observed by dynamic light scattering and electron microscopy. Using 2mM Pi, particles of ~200nm were observed at 24 hours in MEM and at 1 hour in DMEM. These nuclei grew over time, were deposited in the cells, and caused osteogene expression or cell death, depending on the precipitation rate. TEM observations showed that the initial precipitate was amorphous calcium phosphate (ACP), which converts into hydroxyapatite over time. In blood, the scenario is different, because supersaturation is avoided by a tightly controlled pH of 7.4, which prevents the formation of PO43--containing ACP. [Conclusions]: The precipitation of ACP in vitro is unrelated to VC in vivo. The model needs to be refined through controlled pH and the use of additional procalcifying agents other than Pi in order to reproduce calcium phosphate deposition in vivo.Funding was provided by a research grant SAF2012-33898 to VS, http://www.mineco.gob.es/portal/site/mineco/idi, Spanish Ministry of Economy and Competitiveness; research grant MAT2014-54975-R to AM, http://www.mineco.gob.es/portal/site/mineco/idi, Spanish Ministry of Economy and Competitiveness.Peer Reviewe

Contexto y rendimiento en álgebra de bachillerato. Una aproximación estadística

Si bien los esfuerzos por predecir y explicar el problema del rendimiento escolar vienen de mucho tiempo atrás, los recientes reportes de las evaluaciones internacionales en matemáticas reflejan la necesidad de seguir acrecentando la información sobre el tipo y diversidad de variables que intervienen en el rendimiento escolar de los jóvenes. Es así que en el presente trabajo versó sobre identificar la importancia y significatividad de algunas variables contextuales asociadas al rendimiento escolar en estudiantes de educación media superior, en su curso de Álgebra elemental, de acuerdo con los resultados de un análisis estadístico realizado. Se detectó que el género, el área de interés profesional de los estudiantes, el nivel de estudio de los padres, la autopercepción, las notas de clase y la escuela, son variables significativas en el rendimiento escolar