428,711 research outputs found

    Implementing an Android Tool for Visually Impaired Students of E-Learning

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    This article aims to describe the process of learning and development of an educational tool designed for mobile devices (smartphones) with Android technology. In summary, the application was developed based on the virtual learning environment Moodle and aims to develop a learning environment that supports the visually impaired students of e-learning, allowing them to ask questions, discuss and share ideas through forums and use chat rooms in real time. The fundamental purpose of this application is to cooperate with scientific knowledge in the sense that this is a representation of technological advance on the accessibility tools in distance education mode and provide comfort, flexibility and accessibility for the visually impaired students, realizing that education should always be inclusive

    Injective and Projective Model Structures on Enriched Diagram Categories

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    In the enriched setting, the notions of injective and projective model structures on a category of enriched diagrams also make sense. In this paper, we prove the existence of these model structures on enriched diagram categories under local presentability, accessibility, and "acyclicity" conditions, using the methods of lifting model structures from an adjunction introduced by Garner, Hess, Kedziorek, Riehl, and Shipley.Comment: 21 page

    Moore's Paradox and the Accessibility of Justification

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    This paper argues that justification is accessible in the sense that one has justification to believe a proposition if and only if one has higher-order justification to believe that one has justification to believe that proposition. I argue that the accessibility of justification is required for explaining what is wrong with believing Moorean conjunctions of the form, ‘p and I do not have justification to believe that p.

    Pengaruh Aksesibilitas, Jaminan Rasa Aman, Dan Kepercayaan Terhadap Minat Konsumen Menggunakan Layanan Go-Jek Di Kota Palembang

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    This study aimed to examine the effect of accessibility, a sense of security and confidence in the interest of consumers to use the service Go-Jek in Palembang. The population is all the people in the city of Palembang who have never used the services of Go-Jek, Palembang City community sample aged 18 years and over and already know the service Go-Jek, with a sample size of 96 people. Data analysis technique used is multiple linear regression analysis to determine the effect of variable accessibility, a sense of security and confidence in the consumer interest. To find out the results, this study using the Statistical Package for Social Science (SPSS). Results The observations showed that accessibility, a sense of security and confidence affect consumer interest

    Knowledge Accessibility and Regional Economic Growth

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    This paper analyzes the role of knowledge accessibility in re¬gional economic growth. The research question is the following: can the variation in knowledge accessibility between regions in a given period explain the variation in their growth performance in subsequent periods? As knowledge measures, we use company R&D, university R&D and patents. A main assumption in the paper is that knowledge accessibilities as a measure of knowledge potentials transform into potential knowledge flows. Our regression results indicate that the intra-municipal and intra-regional knowledge accessibilities of municipalities are significant and capable of ex¬plaining a significant share of the variation in growth of value added per employee between Swedish municipalities. However, the inter-regional knowledge accessibility of municipalities turned out to be insignificant. This is interpreted as a clear indication of spatial dependence in the sense that the knowledge resources in a given municipality tend to have a positive effect on the growth of another municipality, conditional on that the municipalities belongs to the same functional region. Thus, the results of the analysis indicate that knowledge flows transcend municipal borders, but that they tend to be bounded within functional regions. Also, the analysis shows that there is no remaining spatial correlation among the residuals of the spatial units (municipalities) when using accessibility measures in the model, which confirms that the spatial dependence is captured by the accessibility variables.

    Evolutionary accessibility of mutational pathways

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    Functional effects of different mutations are known to combine to the total effect in highly nontrivial ways. For the trait under evolutionary selection (`fitness'), measured values over all possible combinations of a set of mutations yield a fitness landscape that determines which mutational states can be reached from a given initial genotype. Understanding the accessibility properties of fitness landscapes is conceptually important in answering questions about the predictability and repeatability of evolutionary adaptation. Here we theoretically investigate accessibility of the globally optimal state on a wide variety of model landscapes, including landscapes with tunable ruggedness as well as neutral `holey' landscapes. We define a mutational pathway to be accessible if it contains the minimal number of mutations required to reach the target genotype, and if fitness increases in each mutational step. Under this definition accessibility is high, in the sense that at least one accessible pathwayexists with a substantial probability that approaches unity as the dimensionality of the fitness landscape (set by the number of mutational loci) becomes large. At the same time the number of alternative accessible pathways grows without bound. We test the model predictions against an empirical 8-locus fitness landscape obtained for the filamentous fungus \textit{Aspergillus niger}. By analyzing subgraphs of the full landscape containing different subsets of mutations, we are able to probe the mutational distance scale in the empirical data. The predicted effect of high accessibility is supported by the empirical data and very robust, which we argue to reflect the generic topology of sequence spaces.Comment: 16 pages, 4 figures; supplementary material available on reques

    Assessing the value of the information provision for enhancing the autonomy of mobility impaired users. Madrid pilot Site Study.

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    A City is the space where every person acquires the citizen condition, which demands access to multiple services and facilities, and develops social relations in a free and equal condition of options. A lack of accessibility limits independency and autonomy. Thus, the relationship between “sustainable development” and “accessibility for all” becomes clearer, and both goals reinforce each other. In this sense, information plays a key role in order to overcome existing barriers, specially for people who rarely use public transport, have impaired mobility, or make a particular journey for the first time. The impact and benefits is linked with public transport as a “facilitator” of mobility, and, in particular, for the aim of intermodality. The usefulness of information that should be provided (both the information itself and how is offered) to mobility impaired users (MI users) is discussed on this paper based on following of the ASK-IT project that has being carry out on Madrid. The work was done in close cooperation with representatives of all different types of MI user groups

    A probabilistic concept of accessibility for access structures

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    In this paper we introduce the concept of weighted accessibility for access structures. In some sense, it represents a measure of how difficult or how easy is to recover the secret. We give also a numerical measure of accessibility for each participant depending on his position in the access structure. Both concepts, the accessibility of the access structure and the accessibility of the participants are closely related. We also provide an axiomatic characterization of the weighted accessibility for access structures based on four simple properties

    Landcover degradation analysis of Mediterranean forest by means of hyperplanes obtained from mixture linear algorithms (MLA)

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    The percentage alteration of the Mediterranean forest landscape is one of the primary indicators for its degradation. In this sense, the land cover abundances change analysis by using mixture linear algorithms (MLA), is presented like a good alternative to study this degradation. This research analyzes the use of two information sources like Remote Sensing (Landsat-ETM+) and Field Radiometry (GER 1500) to obtain mixture hyperplanes. These are calculated by models based on least square estimations, assuming that each pure land cover (endmember) belonging to any geographic area, behaves as a random variable which distribution function is known. The mixture hyperplanes provide spectral signatures with a suitable correlation level with regard to the supplied from remote satellite sensors once corrected, for the same geographical zone. These established hyperplanes can be used in future researches about Mediterranean forest landscape changes, because they can represent the different levels of its degradation. In this sense, it is proposed that they will feed a land cover spectral library with free accessibility
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