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Imagen de apoyo de  Paradojas jurídicas

Paradojas jurídicas

Por: Anónimo | Fecha: 1838

Documento en el que se reproducen varios detalles del proceso que se sigue en los Tribunales de apelaciones del Distrito del centro y la Corte Suprema de Justicia, relativo a la causa de José María Neira contra José María Tejada, por posesión de tierras en Boyacá. A lo largo del documento, que conserva la ortografía de la época, se hace referencia al estado general de caso, las solicitudes de Neira de que se le devuelvan las tierras o se le satisfaga el precio de ellas y el interés de ambas partes en poseer los terrenos donde se encuentran las minas de cobre de Gachantivá.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Paradojas jurídicas

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Imagen de apoyo de  Transition into a consumption restricted context: a phenomenological analysis of the experiences of homeless men in the UK

Transition into a consumption restricted context: a phenomenological analysis of the experiences of homeless men in the UK

Por: Andrés Alberto Barrios Fajardo | Fecha: 2013

Generally studies about identity and consumption have assumed that individuals are immersed in a context of abundance, in which their possibilities to fulfil their needs and desires to purposefully construct a consumption lifestyle are granted. Within this context, studies from the Consumer Culture Theory perspective have described how individuals navigate consumer culture by developing enduring relationships with possessions that help them to build identities and a sense of self. However, this is not always possible during every individual’s life. Certain situational factors not only provoke the individual’s loss of what they have already built, but also lead them to a restricted consumption context. The present study focuses on forced and uncertain changing events, those whose severity and/or rapid change disrupts an individual’s entire life. Through a phenomenological approach of the homeless experience, this study attempts to understand individuals’ transition into a restricted consumption context. The empirical data obtained from a twenty two month ethnographic study evidences that experiencing homelessness, individuals’ loss of possessions and the perceived uncertainty that characterizes life on the streets, trigger not only a self-transformation process, but also alter their relationship with the material world. The findings are contrasted with the current literature extending previous work about transition and consumption by: a) Proposing a new transformational routine to describe the forced self-transformations and how consumption (or the lack of it) becomes an element that influences the deconstruction and construction of a new self. b) Identifying how in a restricted consumption context, individuals develop a different relationship with the material world, and how this changes their modes of consumption.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Transition into a consumption restricted context: a phenomenological analysis of the experiences of homeless men in the UK

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Imagen de apoyo de  Safety of Pedestrians and Cyclists when Interacting with Automated Vehicles – A Case Study of the WEpods = Seguridad de los peatones y ciclistas cuando Interactúan con vehículos autónomos caso de estudio: los WEpods

Safety of Pedestrians and Cyclists when Interacting with Automated Vehicles – A Case Study of the WEpods = Seguridad de los peatones y ciclistas cuando Interactúan con vehículos autónomos caso de estudio: los WEpods

Por: Paola Katherine Rodríguez Cabezas | Fecha: 2017

Current research on automated vehicles focuses mainly on the drivers of automated vehicles, on its potential to improve the efficiency of traffic operations, safety, congestion and societal benefits, public’s acceptance of automated vehicles as a transport system and the willingness to buy automated vehicles. Nevertheless, there is a research gap in an equally important topic of research; the interactions of the automated vehicles with Vulnerable Road Users (VRU), i.e., cyclists and pedestrians. The WEpods (shuttle buses) are the first automated pods on public roads amidst other traffic, for an extended period of time in the province of Gelderland, in the Netherlands. The main research question revolves around the safety perception of vulnerable road users (VRUs) when interacting with automated vehicles, specifically at unsignalised intersections, and their crossing behaviour in comparison with traditional motor vehicles. The data on road users’ perception was gathered through face-to-face interviews (𝑁=22), a focus group (𝑁=8), and an online survey (𝑁=198). The results of this research showed that in terms of perceived safety, in general, VRUs (pedestrians and cyclists) feel significantly safer when sharing the road with the WEpods (max. speed of 15 𝑘𝑚/ℎ) compared to traditional motor vehicles (max. speed of 30 𝑘𝑚/ℎ). However, cyclists reported feeling less safe when interacting at unsignalised intersections with the automated vehicles, while there was not significant effect on pedestrians. Similarly, pedestrians more often opted for crossing facilities in the presence of the WEpods than in the presence of traditional motor vehicles (this can be interpreted as the result of perhaps feeling less safe), while no significant difference was reported for cyclists. Some of the reasons that could explain the trust in the WEpods are its low operational speed and the trust of most (81.1%) of the VRUs in the automated technology. This makes them expect the WEpods will stop in all possible instances, even when other traffic participants violate traffic rules. Surprisingly, a significant proportion (63.2%) of the participants was not aware of the presence of the steward on board of the WEpods. On the other hand, variables such as the awareness of the steward and having interacted with the WEpods increased the perceived safety amongst VRUs. Moreover, eye contact and gestures use as part of the actual interaction with human drivers of traditional motor vehicles particularly when crossing, was reported to be of importance by the respondents and has also been previously reported in the literature. The VRUs who said that they rely on cues given by drivers, more often indicated a preference to cross at dedicated facilities in the presence of the WEpods than those who stated not to depend on this type of communication. In order to substitute this lack of “real” interaction, information about the WEpods’ operations appeared to be desired by most of the participants in the form of visual information or a mix of auditory and visual. Finally, it was found that individual characteristics of the VRUs, such as their gender and other demographic variables could also have an impact on their perceived safety of VRUs interacting with the WEpods. The findings of the current research appear to point at a prudent attitude of cyclists and pedestrians in their interaction with automated vehicles. Nevertheless, this conservative mindset could be balanced by informing other road users about both, the features (e.g., the presence of a steward on board) and the limitations (e.g., the technology unable to respond to unexpected conditions) of the WEpods. It is considered that this information, along with a suitable communication of intentions of the vehicle to its surroundings are adequate tools to achieve a safe interaction between VRUs and automated vehicles.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Safety of Pedestrians and Cyclists when Interacting with Automated Vehicles – A Case Study of the WEpods = Seguridad de los peatones y ciclistas cuando Interactúan con vehículos autónomos caso de estudio: los WEpods

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Imagen de apoyo de  Deep Face Recognition = Reconocimiento de Rostros usando herramientas de aprendizaje de máquina

Deep Face Recognition = Reconocimiento de Rostros usando herramientas de aprendizaje de máquina

Por: Wilmar Fernando Moya Rueda | Fecha: 2016

Face recognition is a specific case of object recognition. It has received special attention in the recent years due to a great variety of applications such as robot-human interaction, control by gesture, surveillance, security, and people tracking. The idea of face recognition is to give a computer system the ability of finding and recognizing human faces fast and precisely in images or videos. Face recognition aspires to work similar to human perception. Humans identify a big number of known faces, even after years of separation, or under extreme occlusion conditions, e.g. just by looking at a small part of a face. It is a complex task since faces can have different colors, poses, expressions, and sizes or they can be affected by illumination variations or occlusion conditions. Today, there are different methods of face recognition: feature-based approaches (low-level analysis, feature analysis, active shape models) that make explicit use of facial-features such as skin color, facial landmarks or face geometry, and image-based approaches (linear subspace models, neural networks, statistical approaches). The recent increase in the volume of data and computational resources has led to the need for fast and scalable recognition techniques. These techniques should be robust to non-rigid deformations, clutter, occlusion and illumination variations, but, at the same time, they must be sensitive to variations among faces from different persons. For these reasons, neural networks have become a surge of interest Initially, shallow regular neural networks could be used for small image sizes, but they would not scale to deeper networks since a huge amount of parameters would be necessary to be learnt, which can easily cause overfitting. As a result, Convolutional neural networks (CNNs) were proposed. In a CNN, neurons in a layer are connected to small regions of previous layers, which is different to regular neural networks, where all neurons are connected in a full manner. Besides, CNNs make correct assumptions about the nature of the images, for example locality of pixel dependencies \cite{ImageNet}. In general, CNNs have fewer connections and parameters, they are easier to train, and they present similar or better performance than the regular neural networks \cite{ImageNet}. As an extension of the CNNs, deep CNNs were introduced by Imagenet authors because a big number of high-resolution images and powerful GPUs are now available. The authors increased the number of convolutional layers, and they use large receptive fields in the first convolutional layer. As a result, overfitting, which is inherent to the large size of the model, is avoided and effective results are achieved. In addition, the authors of the VGGnet continued adding convolutional layers, but they keep the size of the receptive fields very small (3x3 convolutions) with a stride of 1, throughout the whole network, which decreases the amount of parameters.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Deep Face Recognition = Reconocimiento de Rostros usando herramientas de aprendizaje de máquina

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Peces marinos

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Investigación pesquera

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Pesca general. Certificado de origen

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Imagen de apoyo de  Development and Validation of  Novel Optimization Approaches to Solve the Flexible Job-Shop Scheduling Problem = Desarrollo y validación de nuevos enfoques de optimización para solucionar el problema de ordenamiento de tipo Job-shop flexible

Development and Validation of Novel Optimization Approaches to Solve the Flexible Job-Shop Scheduling Problem = Desarrollo y validación de nuevos enfoques de optimización para solucionar el problema de ordenamiento de tipo Job-shop flexible

Por: Andrés Alberto García León | Fecha: 2016

The classical job-shop problem is among the most studied scheduling models because it can model a variety of real-life applications. This problem can be reinforced by integrating the operation flexibility to obtain a more realistic model, called Flexible-Job shop Scheduling Problem (FJSP), that capture the salient features of modern systems. To consider both productivity and customer service in the FJSP, objective function such as regular criteria that consider an increasing function of the completion times of the jobs are needed. Makespan consists of minimizing the maximal completion time of all jobs, and it is the most studied criterion in the FJSP. However, minimizing other regular criteria are better suited to capture critical factors that affect the profit of manufacturing and service systems and thus their competitiveness; in particular the importance of jobs(customers) with weighted criteria. This thesis presents innovative general local search approaches to minimize regular criteria in the FJSP in two ways: Single criterion and multi-criteria called Multi-Objective Flexible Job-shop Scheduling Problem (MOFJSP). The local search approaches make use of a generalization of the disjunctive graph model, iteratively progress from one solution to another using two neighborhood structures (N1 and N2). N1 consists of moving all critical operations that belong to critical paths of jobs which affect the criterion being optimized and N2 is a subset of N1 where only operations which belong to blocks. New, efficient and fast sufficient feasibility conditions to obtain moves of the neighborhoods and evaluation functions that assess the quality of the feasible moves are proposed.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Contaminación. Metales pesados

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Imagen de apoyo de  Estimation of evapotranspiration using satellite remote sensing and ground based meteorological data: A case study in Gumara river basin, Ethiopia = Estimación de evapotranspiración usando sensores remotos e información meteorológica: Un estudio de caso en la cuenca del rio Gumara, Etiopia

Estimation of evapotranspiration using satellite remote sensing and ground based meteorological data: A case study in Gumara river basin, Ethiopia = Estimación de evapotranspiración usando sensores remotos e información meteorológica: Un estudio de caso en la cuenca del rio Gumara, Etiopia

Por: Lizeth Nataly Monje Hincapié | Fecha: 2016

The Surface energy Balance System (SEBS) was utilised for evaluating the spatial and temporal variation of the actual evapotranspiration (ETa) over the Gumara basin, using satellite images from Moderate-resolution Imaging Spectroradiometer (MODIS) in combination with meteorological data of the study area, for 12 days of 2006, 6 corresponding to the dry season, and 6 corresponding to the rainy season. The daily ETa was estimated for these days, and then a simple extrapolation of ETa proportionally to the ETp was used to compute the monthly and annual ETa. SEBS estimated an average ETa of 0.84 mm/day for the 6 dates of January, and an average of 4.24 mm/day for the 6 dates of the rainy season. The lowest value was obtained in Jan 2nd, with 0.73 mm/day, and the highest was observed in Sep 21st. Monthly ETa showed the lowest value of 34.20 mm in February; whereas the highest was observed in June with 115.67 mm. The annual ETa was about 847.12 mm, for the 2006. The average ETp estimated for the 12 analysed dates by Pan Evaporation method was about 4.15 mm/day, whereas for the Penman Monteith method was approximately 4.22 mm/day. Particularly for the rainy dates, the daily ETa was very similar to the ETp, with an average difference of 0.16 mm/day. In the water balance method, the difference between the estimated runoff with the ETa by SEBS, and the measured runoff at the station was of approximately 175.60 mm/year. According to these results and, although there are uncertainties associated with the model and the inputs utilised, the SEBS seemed to estimate reasonable values of ETa for the study area.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Pesca general. Aprovechamiento pesquero

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Imagen de apoyo de  Military Change in Colombia: 1998-2014 – Defence Ownership and Norm Compliance = Cambio Militar en Colombia: 1998-2014 – Apropiación de Defensa y Cumplimiento de Normas

Military Change in Colombia: 1998-2014 – Defence Ownership and Norm Compliance = Cambio Militar en Colombia: 1998-2014 – Apropiación de Defensa y Cumplimiento de Normas

Por: Oscar Alejandro Garzón Gómez | Fecha: 2015

Despite the numerous and insightful studies on military change, the scope of the countries and militaries, which have been a subject of analysis is limited. The attention has been brought mainly to the study of lessons from the United States, Great Britain and France. Some other studies explore Russia (and former USSR), Ireland, Israel and Japan among others, while not many have sought to explain how the armed forces of states committed to fight against a long-lasting insurgency in a non-international armed conflict, amidst constrained economies and particular social and cultural settings, have undertaken the endeavour to innovate, emulate and adapt. The present dissertation explores three case studies featuring evidence of innovation, emulation and adaptation in Colombia, in which ‘defence ownership’ is introduced as the overarching concept identified as an enabler of military change in a developing country dealing with a non-international armed conflict. Furthermore, it is argued that the effects of ‘norm compliance’ had provided the framework of action for innovation, limited the extent of emulation and represented the converging mechanism for using military capabilities for social purposes.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Climatología. Cuencas

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