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Imagen de apoyo de  Casas para obreros o económicas

Casas para obreros o económicas

Por: D. J. A. Rebolledo | Fecha: 1872

Estudio y análisis sobre el diseño que deben tener las casas de los obrerros en España. El texto está dividido en tres partes, en la primera de ella, se discuten sobre las condiciones técnicas e higiénicas que deben contar las viviendas. En la segunda, se hace un estudio comparativo de las casas obreras en otros países y, finalmente, la última parte se destina a la aplicación de datos y reglas precedentes al caso de España.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Libros
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Casas para obreros o económicas

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Imagen de apoyo de  Fuentes de riqueza

Fuentes de riqueza

Por: Antonio Izquierdo | Fecha: 1916

Impreso en el que se recopila diversa documentación relacionada con el porvenir de la industria agrícola en Colombia, con el objetivo de que los legisladores conozcan sobre el tema y tengan aptitudes para tomar determinaciones con miras a mejoras nacionales en el agro. Dentro de la documentación disponible en el documento, se puede encontrar un proyecto de ley sobre la industria pecuaria y la recomendación de la raza bovina Hereford para promover la ganadería en Colombia.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Libros
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Fuentes de riqueza

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Imagen de apoyo de  Applications of Deep Learning in Natural Language Processing for Information Extraction on German Language Documents

Applications of Deep Learning in Natural Language Processing for Information Extraction on German Language Documents

Por: Miguel Fernando Cabrera Granados | Fecha: 2014

Abstract: The success of machine learning algorithms depends on the representation of the data used. Specific domain knowledge can be used to design good representations. However, these representations are limited to a specific problem or task, and to the amount of available labeled data. Another approach is to automatically learn generic priors that can be used in different tasks and context. In the field of natural language processing, recent work has been done in obtaining such priors by learning useful vector representation of words from unlabeled data. The representations can then be used to improve existing natural language processing systems. These word vectors are obtained using special neural network architectures trained on billions of tokens. However, most of these models are learned and evaluated on English language corpora. In this work, Word2vec, a recent neural network based toolkit for learning word representations is used on German language data. The goal is to evaluate the learned representations of words in different language processing and information retrieval tasks. In particular, a semantic-syntactic evaluation set is constructed for the German language. In addition to that, the learned word vector representations are used as features for a classifier of German language business documents. The learned features outperformed existing handcrafted features and performed similar to other state-of-the-art approaches. Resumen: El éxito de los algoritmos de aprendizaje automático depende de la representación de los datos utilizados. conocimiento de dominio específico se puede utilizar para diseñar buenas representaciones. SIN EMBARGO, representaciones de síntesis se limitan a un problema o tarea específica, y que la cantidad de datos disponibles etiquetados. Otro enfoque es aprender automáticamente priores genéricos hizo kann utilizado en diferentes tareas y el contexto. En el campo del procesamiento del lenguaje natural, los trabajos recientes se ha hecho en la obtención de distribuciones previas examinados por el aprendizaje de la representación vector útil de las palabras de datos no etiquetados. Las representaciones a continuación, se pueden utilizar para mejorar el sistema de procesamiento de lenguaje natural existente. Estos vectores de palabras se obtienen utilizando arquitecturas de redes neuronales especiales entrenados en miles de millones de fichas. Sin embargo la mayoría de los modelos de síntesis se aprenden y se evalúa el corpus idioma Inglés. En este trabajo, Word2vec, un conjunto de herramientas basadas red neuronal reciente para el aprendizaje de representación de palabra se utiliza en los datos de idioma alemán. El objetivo es evaluar las representaciones aprendido de palabras en diferentes tareas de procesamiento del lenguaje y la recuperación de información. En particular, una evaluación semántico-sintáctica conjunto se construye para el idioma alemán. Además de eso, las representaciones vectoriales de palabras aprendidas se utilizan como características para un clasificador de documentos comerciales idioma alemán. Las características aprendidas superaron características artesanales existentes y funcionando de modo similar a otros enfoques del estado de la técnica.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Applications of Deep Learning in Natural Language Processing for Information Extraction on German Language Documents

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Imagen de apoyo de  Performance, instrumentation and numerical simulation of one museum park west excavation = Desempeño, instrumentación y modelación numérica de la excavación del edificio “One museum park west”

Performance, instrumentation and numerical simulation of one museum park west excavation = Desempeño, instrumentación y modelación numérica de la excavación del edificio “One museum park west”

Por: Luis Guillermo Arboleda Monsalve | Fecha: 2014

The excavation for the 53-story reinforced concrete One Museum Park West building (OMPW) in Chicago was constructed using combined support systems. The building was supported by caissons and a perimeter wall formed by secant piles which transitioned to tangent piles below the bottom of the cut. After installing the perimeter wall and deep foundations for the building, the excavation for the reinforced concrete central core was supported by a circular cofferdam made of sheet piles and steel ring beams. This excavation was made using conventional bottom-up excavation techniques. The excavation for the rest of the building was made using a top-down method and was laterally braced with reinforced concrete floor slabs structurally connected to the secant pile walls and the reinforced concrete core. Field performance data during construction of the OMPW basements were collected with settlement points, inclinometers and strain gages installed in the concrete basement slabs. Significant settlements were observed adjacent to the excavation during wall and deep foundation installation, central core construction and top-down excavation. The influence of concrete material time-dependence of the floor slabs on the performance during top-down excavation is evaluated and a method for the separation of temperature-related strains from the excavation-induced strains in the concrete is described. The construction of the basements is simulated with a 3D numerical structural model to study the influence of the concrete material time-dependence of the floor slabs in the excavation-induced movements resulting from top-down construction. Computed strains in the floor slabs are compared with the observed performance data collected from the strain gages. For use in numerical simulation of the entire excavation process, hypoplasticity constitutive parameters for clays (HC model) at the element test level were calibrated with tests conducted on high quality block samples obtained from the excavation of Block 37 project in Chicago. They included oedometer tests, bender element measurements, and triaxial tests following different stress probes, and were further refined with seismic cone penetration results.  The entire OMPW excavation is simulated with the calibrated parameters with a fully coupled-flow deformation, three-dimensional finite element model. Influence of the construction of secant pile walls, concrete material time-dependence, and nonlinear concrete behavior of the perimeter pile walls on the performance of the OMPW excavation is determined. Conclusions about top-down construction are drawn in light of the measured and simulated performance of the OMPW excavation.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Performance, instrumentation and numerical simulation of one museum park west excavation = Desempeño, instrumentación y modelación numérica de la excavación del edificio “One museum park west”

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Imagen de apoyo de  How can the participation of Johnny Cay workers support the FreshWaterMill project? Systems and bottom-up approach to a technology transfer from The Netherlands to Johnny Cay, San Andrés, Colombia

How can the participation of Johnny Cay workers support the FreshWaterMill project? Systems and bottom-up approach to a technology transfer from The Netherlands to Johnny Cay, San Andrés, Colombia

Por: Diana Carolina Palacios Giraldo | Fecha: 2016

The FreshWaterMill project is a transfer of Environmentally Sound Technology (EST) from The Netherlands to Colombia that involves several Dutch companies, the Delft University of Technology and Coralina (corporation for sustainable development of the Archipelago San Andrés, Providence and Saint Kathleen). The installation place is Johnny Cay, a small islet 1.5 km northeast from San Andrés, Colombia, uninhabited and exclusive for touristic use (Van Tonningen, 2014). The technology is a wind powered reverse osmosis (RO) system that can fulfil the drinkable water and electricity demands of the Cay. This way can be alleviated the sanitary conditions resulting from unsustainable touristic practices. Moreover, this project is seen as a promoter of sustainable development in the Archipelago (Coralina, 2006), and as a potential solution to provide electricity and water to rural and remote areas of low utility coverage but abundant wind power. There are no environmental or social impact analyses that validate the sustainable character of the technology transfer. Moreover, although it is intended to improve the livelihood of target users their opinions are not reflected in the project plans. This situation resembles those factors that describe the trend to failure of technology transfers. Therefore this research made an integral assessment of the project as a Socio-Technical System (STS) to provide useful findings and recommendations that could lead it away from such trend. The Functions of Innovation Systems (FIS) framework (Van Alphen, 2008) was chosen for a systems approach analysis. Through this was found that poor planning, insufficient financial resources and ineffective communication channels are the most relevant barriers for a successful implementation of the FreshWaterMill. The most relevant drivers are the suitability of the place for a wind/RO system, the planning of a local educational center, a remarkable advocacy for Renewable Energy Technologies (RETs) in the Archipelago and the existence of local human capital and R&D on RE. Five conditions for self-organization were derived from the PAR (Participatory Action Research) methodology to explore the likeliness of self-organization for bottom-up management. Through this methodology was shown that the difficult relationship between the corporation and the touristic service providers, their lack of group cohesion, managerial and operational capacities, ignorance and/or misuse of instruments for self-organization, make unfeasible for this group to address the barriers and support the drivers of the project. Relevant conditions from the context not covered by the previous methodologies were also included. These reflected that the advocacy for RETs is counteracted by the fragmentation between institutional actors and their lack of managerial skills on technology topics, which makes them rely on national and international assistance to achieve a technological transition. The regular interaction that Johnny Cay workers will have with the windmill, the affinity of the life plan of young adults to the project objectives and the likeliness of this group to make economic contributions urges the need for a participatory approach. The socio-cultural crisis of the Archipelago supports this recommendation. However, the difficulty of institutional entities to understand and assume the roles that require a participatory approach and the path dependency on top-down regulation makes it a complex challenge. A participatory approach for the FreshWaterMill is indirectly supported by the management plan of the Natural Regional Park Johnny Cay and the Community and institutional participation board. Additional to the commitment of the corporation to assume an enabling role, the process needs a mediator so the touristic service.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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How can the participation of Johnny Cay workers support the FreshWaterMill project? Systems and bottom-up approach to a technology transfer from The Netherlands to Johnny Cay, San Andrés, Colombia

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Imagen de apoyo de  Sensing with a 3-toe foot for a mini biped robot = Midiendo con un pie de 3 dedos para mini robots bipedos

Sensing with a 3-toe foot for a mini biped robot = Midiendo con un pie de 3 dedos para mini robots bipedos

Por: Sergio Orlando Castro Gómez | Fecha: 2014

El trabajo presenta el diseño e implementación de un pie de tres dedos para robots bípedos. El sistema es capaz de medir el centro de presión sobre superficies planas e irregulares. El modelo ha sido creado para ser usado en robots bípedos, suministrando información sobre el centro de presión y el punto de momento cero. Dicha información es usada como entrada para un sistema de control, que asegurará la estabilidad del robot durante su caminata por diferentes superficies.
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Sensing with a 3-toe foot for a mini biped robot = Midiendo con un pie de 3 dedos para mini robots bipedos

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Imagen de apoyo de  A Framework For The Managemente Of The Biodegradable Waste In Bogotá-Colombia = Un Marco Para El Manejo De La Basura Biodegradable En Bogotá-Colombia

A Framework For The Managemente Of The Biodegradable Waste In Bogotá-Colombia = Un Marco Para El Manejo De La Basura Biodegradable En Bogotá-Colombia

Por: Adriana Lizette Gutiérrez Bayona | Fecha: 2014

Waste management is one of the growing problems in many highly populated cities around the world, and the amount of strategies designed to solve it has changed during the last decade. It passed from land filing to incineration and mechanical biotechnology; this quick change was partially induced by the threat that garbage is for the environment, and later on by the acceleration of climate change, since the public services industry was bound to comply with the emissions reduction targets. The newest technologies are being applied in Europe and North America, giving them a new way to face their waste issues. However, the industrialized States are not the only ones with these concerns, in the developing countries, it is a matter that is becoming an structural problem, because of the population growth and the dynamics of the capitalist practice; moreover, it is difficult to solve due to low budget or lack of knowledge on the topic. In Bogotá D.C, waste management became one of the most controversial topics due to the many problems presented during the implementation of the Zero-Waste program and the past administrative issues with the Landfill Doña Juana that led to many health and land predicaments for the population. As a consequence, this dissertation seeks to create a new strategy to fix the gaps of the original policy, by designing five time-limited specific objectives, a reform to the segregation strategy and proposing the construction Anaerobic Digestion plant as the best solution for the sustainable control of bio-waste. Therefore, this work will show throughout all the chapters the background of the waste management system, the new strategies to be taken into account by the local administration, the advantages of the AD technology and the possible financing channels for the renovation of the Basuras- Cero Policy. All the information above will be use to conclude, that for the case of Bogotá D.C, the use of bio-waste as a new energy source will strengthen the recycling industry (with the establishment of a better segregation system and the construction of and AD plant) reduce the amount of waste sent to Landfill and decrease GHG emissions; and even though it is a small step, it can become the foundation for fixing some weaknesses of the economic system and some social mores.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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A Framework For The Managemente Of The Biodegradable Waste In Bogotá-Colombia = Un Marco Para El Manejo De La Basura Biodegradable En Bogotá-Colombia

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Imagen de apoyo de  Organic photodetectors = Fotodetectores organicos

Organic photodetectors = Fotodetectores organicos

Por: Caterin Yojana Salas Redondo | Fecha: 2014

Organic semiconductors are used in many fields of photonics. Displays fabricated using organic light emitting diodes (OLED) can be found in modern smartphones and tablets, whereas organic solar cells (OPV - organic photovoltaics) are emerging with demonstrated efficiencies above 10%. Organic photodetectors (OPD) are another very interesting domain, with ultrathin active layers (order of tens of nanometers) providing performance comparable to bulk inorganic devices. Thanks to a multitude of possible compounds, parameters such as response spectrum, cut-off wavelength etc. can be easily tuned. Because of very high absorption coefficient and low refractive index, issues such as crosstalk or reflection can be minimized. Another exciting feature is the low processing temperature and thus feasibility of using a flexible foil as substrate, leading to rollable or curved photodetector arrays.The performance of organic based photodetectors has grown considerably in the recent years in terms of high speed, high frequency response and detectivity so as to match the required custom specifications for practical applications such as imaging. However, further attention needs to go towards the understanding of the effects of scaling during miniaturization of these devices, while looking for the preservation and/or optimization of their opto-electrical properties. Therefore, in this thesis, emphasis is given on the photodetectors based on organic conjugated polymer materials for imaging applications. These organic photodetector devices normally suffer from a perimeter-to-area dark current density scaling, hence, special attention is on the understanding of this scaling effect as well as optimization of the fabrication process in order to get low leakage (dark) current, and therefore, large dynamic range of the OPDs. Photodetectors with different geometries and sizes from 0.08 cm2 down to 1.95E ?5 cm2 were fabricated, using two types of edge cover layer. Isolated islands of two different organic films were patterned with photolithography in order to study the dark current mechanisms. Electrical, optical and morphological properties were characterized for both patterned and non-patterned devices. The patterning process used to fabricate the isolated devices does not affect the optoelectrical and morphological characteristics of the photodetectors, and therefore their performance. Moreover, it does not induce or accelerate degradation of the organic films. The dark current density further decreases after full patterning is performed, while preserving all device characteristics. It is proposed to replace the semitransparent edge cover layer by the opaque, if thicker films can be achieved, as it might be possible to decrease the contribution of the perimeter leakage. Once the patterning process is performed, it is possible to implement these isolated devices as photodetectors arrays for imaging applications with an Ion/Ioff ratio of 6 orders of magnitude. It is proposed to perform a theoretical study of the dark current mechanism at the interface between the polymer and the metallic contact edges to model and simulate the perimeter recombination at reverse bias conditions. Moreover, further measurements such as electroluminescent and spectroscopy might aid to characterize the carrier transport in the OPDs. The project was aimed within the R&D department of large area electronics. Moreover, all the fabrication and characterization were performed in the facilities of IMEC.
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Organic photodetectors = Fotodetectores organicos

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Imagen de apoyo de  Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

Por: Javier Solano Martínez | Fecha: 2012

One of the effects of the globalisation of our society is that people travel more covering longer distances, live far from their work place and consume goods from all around the world. Therefore, it is no coincidence that the transport of people and goods represents more than 25\% of the energy consumption and is one of the principal sources of pollution worldwide. Several efforts must be done to reduce the oil dependence, the energy consumption and the environmental impact of transport systems. In this perspective, the French Army (DGA) has designed and constructed the Electrical Chain Components Evaluation vehicle (ECCE). It is a mobile laboratory to evaluate under real conditions the electric components of Hybrid Electrical Vehicles (HEVs) that reduce the energy consumption and the pollution emission of conventional vehicles. ECCE permits evaluating different energy sources such as batteries, fuel cells, internal combustion engines, ultracapacitors or flywheels. The ECCE project, nowadays in a second phase\footnote{The first phase of the ECCE project is explained in Chapter 1} is developed in joint cooperation with the FEMTO-ST laboratory of the University of Franche-Comté and two industrial partners, HELION and PANHARD General Defense. It aims to study the implementation, control and energy management of different hybrid sources. As a research developed along the second phase of the ECCE project, the principal objective of this thesis is to design, to implement and to evaluate an energy management supervision system in the ECCE HEV. This thesis proposes an original energy management strategy based on expert knowledge and type-2 fuzzy logic. The design of the fuzzy logic controller is done by using knowledge engineering. This technique allows extracting knowledge from several experts using surveys. The consideration of type-2 fuzzy logic systems enables modelling the uncertainty in the answers of the experts. This thesis presents a second application of type-2 fuzzy logic: the voltage regulation of a DC/DC power converter. The principal motivation for developing this application is that it is easier to implement in laboratory at a relatively low cost and it permits a viability evaluation of type-2 fuzzy logic before an implementation in the ECCE mobile laboratory. This is useful because one of the main challenges of this thesis is to reduce the time to experimentally validate the energy management system. This is required to respect the time schedule constraints and to reduce the costs associated to gather the partners of the project at PANHARD locations in Saint-Germain Laval.
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Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

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Imagen de apoyo de  Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

Por: Daniel Hincapie Henao | Fecha: 2014

Vectoring is a novel technology created to expand the capacity boundaries of Veryhigh- bit-rate DSL 2 (VDSL2) systems. It mitigates the reduction of data rate and reach in VDSL2 systems caused by the crosstalk interference that appears when multiple services share the telephone network’s infrastructure. However, the implementation of vectoring on real systems faces numerous challenges that limit its potential to enhance the data rate and reach of VDSL2 systems. Therefore, evaluating its performance in close-to-real scenarios considering different technological aspects has turned into an interesting field of research that also helps in the development of new and faster technologies. This thesis evaluates quantitatively the performance of vectoring on VDSL2 systems. It proposes the extension and parametrization of performance indicators to compare and measure the impact of six different aspects on vectoring systems: network topology, binder occupancy, background noise, channel estimation errors, complexity constraints, and precoding and canceling schemes. Their evaluation requires numerical results that are obtained through a simulation tool, which is designed and implemented as part of this thesis. The obtained results and the conducted analyses give concluding guidelines for the vectoring technology and can be taken into account by manufactures and service providers for the deployment of real systems. In addition, and as a result of the objective of providing an accurate evaluation that represents well the real systems’ performance, this thesis contributes with the statistical characterization of the Far-end Crosstalk (FEXT) in a 50-pair cable binder commonly used in Germany (DTAG-40) and constructs its stochastic model. The model and the results are verified through real systems measurements, reference documents of the Broadband Forum and existing literature. Thus, the simulation tool and the characterized channel model constitute a contribution for the evaluation of DSL systems that can be used in future works.
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Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

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