Call centers terciarizados : Los desafíos para la organización de los trabajadores en una actividad económica emergente

En el presente trabajo pretendemos explorar cuáles son las posibilidades de organización de los trabajadores en una actividad económica emergente como son los call centers terciarizados. En este sentido, nuestra meta principal será identificar ciertos dilemas y ejes problemáticos en el campo de la organización colectiva para estos espacios laborales atravesados por estrategias de flexibilización empresarial tales como la subcontratación y la deslocalización. En este marco de reflexión, indagamos hacia dónde se dirigen las estrategias de los sindicatos ante las transformaciones productivas en marcha -que han sido muy aceleradas en el sector de las telecomunicaciones-, cuál es la dinámica de estos actores y cuáles son los obstáculos mayores a su accionar. Asimismo, exploramos la existencia de nuevas formas de organización colectiva alternativas que dan voz a los intereses de los trabajadores por fuera de los sindicatos tradicionales. Describimos sus rasgos distintivos, sus condiciones de surgimiento y las ventajas y limitaciones respecto de los sindicatos clásicos. Finalmente, examinamos de qué manera ciertos aspectos ligados a los trabajadores y a la conformación de experiencias subjetivas en estos espacios laborales se relacionan con un mayor o menor grado de inclinación hacia la organización colectiva

Inversiones en servicios : Nuevas territorialidades en la expansión de call centers en el interior de la Argentina, 2002-2010

En la Argentina, el año 2002 marca el inicio de una serie de transformaciones productivas con fuerte impacto sobre las dinámicas territoriales, a partir de la llegada de inversiones extranjeras directas. Una importante porción de dichas inversiones se orienta a desarrollar actividades de baja jerarquización, en donde la competitividad se obtiene vía la reducción de los costos laborales y el otorgamiento de ventajas impositivas y subsidios hacia las empresas. La significativa expansión de la actividad de los call centers tercerizadores -que, en los últimos años, se localizan masiva y vertiginosamente en las principales ciudades del interior de nuestro país- es la evidencia empírica de este fenómeno. Analizar sus características, junto con una detallada descripción de las interacciones de los organismos estatales y los sectores políticos, sociales y económicos involucrados en la instalación de los call centers, no solo permite observar las transformaciones territoriales -en tanto se insertan nuevas actividades productivas y de empleo- sino que visibiliza mecanismos de cooperación y/o conflicto mediante los cuales los actores nacionales y foráneos posibilitan y modelan la inserción de lo global en lo local, materializando así novedosas lógicas de organización territorial, que representamos bajo el concepto "nuevas territorialidades". A lo largo de todo el trabajo, intentamos que nuestra mirada de estos procesos pueda dar cuenta de las (a)simetrías de poder entre los agentes económicos y actores estatales y extraestatales, en el marco de espacios locales periféricos en una época de globalización

Wet tundra polygon centers and distance between polygon centroids on Samoylov Island, Lena Delta, Siberia, Russia, with links to shape files

Subgrid processes occur in various ecosystems and landscapes but, because of their small scale, they are not represented or poorly parameterized in climate models. These local heterogeneities are often important or even fundamental for energy and carbon balances. This is especially true for northern peatlands and in particular for the polygonal tundra, where methane emissions are strongly influenced by spatial soil heterogeneities. We present a stochastic model for the surface topography of polygonal tundra using Poisson-Voronoi diagrams and we compare the results with available recent field studies. We analyze seasonal dynamics of water table variations and the landscape response under different scenarios of precipitation income. We upscale methane fluxes by using a simple idealized model for methane emission. Hydraulic interconnectivities and large-scale drainage may also be investigated through percolation properties and thresholds in the Voronoi graph. The model captures the main statistical characteristics of the landscape topography, such as polygon area and surface properties as well as the water balance. This approach enables us to statistically relate large-scale properties of the system to the main small-scale processes within the single polygons.

A contribution to the deterministic modelling of circadian rhythms in cell proliferation activity

This paper presents a deterministic continuous model of proliferative cell activity. The classical series of connected compartments is revisited along with a simple mathematical treatment of two hypotheses: constant transit times and harmonic Ts. Several examples are presented to support these ideas, both taken from previous literature and recent experiences with the fish Carassius auratus, developed at the Junta de Energía Nuclear, Madrid, Spain.

Leveraging heterogeneity for energy minimization in data centers

Energy consumption in data centers is nowadays a critical objective because of its dramatic environmental and economic impact. Over the last years, several approaches have been proposed to tackle the energy/cost optimization problem, but most of them have failed on providing an analytical model to target both the static and dynamic optimization domains for complex heterogeneous data centers. This paper proposes and solves an optimization problem for the energy-driven configuration of a heterogeneous data center. It also advances in the proposition of a new mechanism for task allocation and distribution of workload. The combination of both approaches outperforms previous published results in the field of energy minimization in heterogeneous data centers and scopes a promising area of research.

Hybrid Contribution of JPEG200 Video Files for Professional Production Centers Reliability and Non-Reliability Transmission File Based in Image Quality Needed

ATM, SDH or satellite have been used in the last century as the contribution network of Broadcasters. However the attractive price of IP networks is changing the infrastructure of these networks in the last decade. Nowadays, IP networks are widely used, but their characteristics do not offer the level of performance required to carry high quality video under certain circumstances. Data transmission is always subject to errors on line. In the case of streaming, correction is attempted at destination, while on transfer of files, retransmissions of information are conducted and a reliable copy of the file is obtained. In the latter case, reception time is penalized because of the low priority this type of traffic on the networks usually has. While in streaming, image quality is adapted to line speed, and line errors result in a decrease of quality at destination, in the file copy the difference between coding speed vs line speed and errors in transmission are reflected in an increase of transmission time. The way news or audiovisual programs are transferred from a remote office to the production centre depends on the time window and the type of line available; in many cases, it must be done in real time (streaming), with the resulting image degradation. The main purpose of this work is the workflow optimization and the image quality maximization, for that reason a transmission model for multimedia files adapted to JPEG2000, is described based on the combination of advantages of file transmission and those of streaming transmission, putting aside the disadvantages that these models have. The method is based on two patents and consists of the safe transfer of the headers and data considered to be vital for reproduction. Aside, the rest of the data is sent by streaming, being able to carry out recuperation operations and error concealment. Using this model, image quality is maximized according to the time window. In this paper, we will first give a briefest overview of the broadcasters requirements and the solutions with IP networks. We will then focus on a different solution for video file transfer. We will take the example of a broadcast center with mobile units (unidirectional video link) and regional headends (bidirectional link), and we will also present a video file transfer file method that satisfies the broadcaster requirements.

Results of students surveys in similar courses given in different centers of the Technical University of Madrid

We present and analyze the results of surveys conducted in recent years with students from two related subjects, but taught in different centers of the University of Madrid. These surveys are part of the objectives of various projects of educational innovation, and applied through the platform Moodle.

A cyber-physical approach to combined HW-SW monitoring for improving energy efficiency in data centers

High-Performance Computing, Cloud computing and next-generation applications such e-Health or Smart Cities have dramatically increased the computational demand of Data Centers. The huge energy consumption, increasing levels of CO2 and the economic costs of these facilities represent a challenge for industry and researchers alike. Recent research trends propose the usage of holistic optimization techniques to jointly minimize Data Center computational and cooling costs from a multilevel perspective. This paper presents an analysis on the parameters needed to integrate the Data Center in a holistic optimization framework and leverages the usage of Cyber-Physical systems to gather workload, server and environmental data via software techniques and by deploying a non-intrusive Wireless Sensor Net- work (WSN). This solution tackles data sampling, retrieval and storage from a reconfigurable perspective, reducing the amount of data generated for optimization by a 68% without information loss, doubling the lifetime of the WSN nodes and allowing runtime energy minimization techniques in a real scenario.

Leakage and temperature aware server control for improving energy efficiency in data centers

Reducing the energy consumption for computation and cooling in servers is a major challenge considering the data center energy costs today. To ensure energy-efficient operation of servers in data centers, the relationship among computa- tional power, temperature, leakage, and cooling power needs to be analyzed. By means of an innovative setup that enables monitoring and controlling the computing and cooling power consumption separately on a commercial enterprise server, this paper studies temperature-leakage-energy tradeoffs, obtaining an empirical model for the leakage component. Using this model, we design a controller that continuously seeks and settles at the optimal fan speed to minimize the energy consumption for a given workload. We run a customized dynamic load-synthesis tool to stress the system. Our proposed cooling controller achieves up to 9% energy savings and 30W reduction in peak power in comparison to the default cooling control scheme.

Temperature-depnedent disruption of circadian oscillations in woody plants-A mathematical approach

Poster

Uncovering cold disruption of the circadian clock in poplar

Dormancy is an adaptive mechanism that allows woody plants to survive at low temperatures during the winter. Disruption of circadian clock genes in winter or under low temperatures, both in long days as in short days, were described in our group few years ago (Ramos et al., 2005). Basic mechanisms of the circadian clock function are similar in herbaceous as well as in woody plants although there are differences in their response to low temperatures (Bieniawska et al., 2008). Woody plants growing in daylight conditions should have a specific transcriptional control above the circadian clock genes, which is responsible of their constitutive transcriptional activation observed under low temperatures conditions. In order to understand this regulatory process, we are analyzing the behavior of a circadian clock gene in poplar. To this aim, we have isolated its promoter region and fused to the luciferase reporter gene. This construct has been transformed into Populus tremula x P. alba 717-1B4 INRA clone. Here we present the characterization of these transgenic lines under different conditions of light and temperature.