3,114 research outputs found

    Algunas evidencias sobre el sistema De apoyo y enseñanza y aprendizaje En la Universidad Estatal a Distancia de Costa Rica

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    La UNED de Costa Rica ofrece sus servicios en 31 centros universitarios, distribuidos por todo el país. Por ser una institución pública, tiene el mandato de atender a estudiantes sin distingo de raza; condición social, religiosa, sexual; de discapacidad, geográfica, u otro. Por su lado, los estudiantes matriculados deben cumplir con los requisitos establecidos por la ley para los sistemas de educación superior. El presente estudio tuvo el objetivo de conocer las opiniones que tienen los estudiantes, profesores y encargados de cátedra acerca del proceso de enseñanza y aprendizaje en la Universidad Estatal a Distancia. La información necesaria para lograr nuestro propósito se obtuvo por medio de entrevistas a estudiantes, profesores y encargados de cátedra de toda la UNED de Costa Rica.Centre D`Application, D`Étude Et De Ressorces En Apprentissage A Distance (Caerenad

    Convergence of spectral truncations for compact metric groups

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    We consider Gromov-Hausdorff convergence of state spaces for spectral truncations of a compact metric group GG. We work in the context of order-unit spaces and consider orthogonal projections PΛP_\Lambda in L2(G)L^2(G) corresponding to finite subsets of irreducible representations ΛG^\Lambda \subseteq \widehat G. We then prove that the sequence of truncated state spaces {S(PΛC(G)PΛ)}Λ\{ S(P_\Lambda C(G) P_\Lambda)\}_\Lambda Gromov-Hausdorff converges to the original state space S(C(G))S(C(G)), when these are equipped with a metric associated to a Lip-norm which in turn is induced by the action of GG.Comment: 9 page

    On the order of summability of the Fourier inversion formula

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    In this article we show that the order of the point value, in the sense of Łojasiewicz, of a tempered distribution and the order of summability of the pointwise Fourier inversion formula are closely related. Assuming that the order of the point values and certain order of growth at infinity are given for a tempered distribution, we estimate the order of summability of the Fourier inversion formula. For Fourier series, and in other cases, it is shown that if the distribution has a distributional point value of order k, then its Fourier series is e.v. Cesàro summable to the distributional point value of order k+1. Conversely, we also show that if the pointwise Fourier inversion formula is e.v. Cesàro summable of order k, then the distribution is the (k+1)-th derivative of a locally integrable function, and the distribution has a distributional point value of order k+2. We also establish connections between orders of summability and local behavior for other Fourier inversion problems

    Implementación de un virus enfocado en dispositivos móviles Android. Un evento de hacking ético

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    Mobile devices have become part of daily social life. However, the vulnerabilities of this equipment are widespread, affecting information or damaging the system internally. Within this problem, this research proposes the implementation of a virus that allows affecting the Android victim device focusing on finding the vulnerabilities through penetration tests. The virus was designed through the principle of thread programming to a generation of scripts. Furthermore, the attack on Android devices’ vulnerable systems is conducted, applying social engineering techniques. Thus, through imperative programming techniques and functional, the access and use have been achieved, given that the virus had classes that allow connection and communication with the device. Each class was developed together so that in this way, there is a precise relationship between them. In this study, Kali Linux, with different Metasploit commands, was used.  The proofs of concept were conducted using controlled virtual network environments. For this, a server and a platform were used to use the IP and the Ngrok host, which allows us to generate       a link with the application that will violate Android’s services and security over secure tunnels. The results show that the operating system tends to be prone to internal damage. At the same time, users can be affected when their security and privacy are compromised. The proposal contributes significantly to a new version of Android’s security patches, implementing   a malware model that will integrate techniques to mitigate this problem in the future.Los dispositivos  móviles se  han convertido  en parte de la vida social diaria. Sin embargo, las vulnerabilidades de este equipo están muy extendidas, afectando la información o dañando el sistema internamente. Dentro de esta problemática, esta investigación propone la implementación de un virus que permita  afectar  al  dispositivo  Android  víctima  enfocándose en encontrar las vulnerabilidades mediante pruebas de penetración.   El   virus   fue   diseñado   a   través   del   principio   de programación de subprocesos para una generación de scripts. Además,  se  realiza  el  ataque  a  los  sistemas  vulnerables  de los  dispositivos  Android,  aplicando  técnicas  de  ingeniería  social.  Así,  mediante  técnicas  de  programación  imperativas  y funcionales, se ha logrado el acceso y uso, dado que el virus contaba  con  clases  que  permiten  la  conexión  y  comunicación con  el  dispositivo.  Cada  clase  se  desarrolló  en  conjunto  para que de esta manera, haya una relación precisa entre ellas. En este estudio se utilizó  Kali Linux, con diferentes comandos de Metasploit. Las pruebas de concepto se realizaron utilizando entornos  de  red  virtual  controlados.  Para  ello  se  utilizó  un servidor y una plataforma para utilizar la IP y el host Ngrok, lo  que  nos  permite  generar  un  enlace  con  la  aplicación  que vulnerara´ los servicios y la seguridad de Android sobre túneles seguros. Los resultados muestran que el sistema operativo tiende a ser propenso a sufrir daños internos. Al mismo tiempo, los usuarios pueden verse afectados cuando su seguridad y privacidad se ven comprometidas. La propuesta contribuye significativamente   a   una   nueva   versión   de   los   parches   de seguridad de Android, implementando un modelo de malware que integrara´ técnicas para mitigar este problema en el futuro

    Sura ῖdiarã waimasã merã momêyare gũsã majsῖrῖ : Jutua bojoka waimaja mena dobeayere kũja majῖrῖke

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    Se describe el trabajo desarrollado en el convenio SENA-Tropenbos en el marco del proyecto “formación en Gestión Ambiental y Cadenas Productivas Sostenibles” en el que se expone conocimiento ancestral siriano y bará sobre las abejas en la comunidad Bogotá Cachivera, Mitú, se describen aspectos culturales, usos de los productos de las abejas, clasificación etnoentomologica de las abejas y el proceso para la cría y obtención de mielThe work developed in the SENA-Tropenbos agreement within the framework of the project "Training in Environmental Management and Sustainable Productive Chains" in which ancestral knowledge of Syrian and Bará about bees in the Bogotá Cachivera, Mitú community is described. cultural, uses of bee products, ethnoentomological classification of bees and the process for breeding and obtaining honeyPresentación -- Las abejas en el mundo indígena -- El pueblo siriano y el pueblo bará -- Historias --- Historias recientes -- Juegos tradicionales -- Usos de los productos de las abejas -- Clasificación de las abejas -- Etnoentomología siriano y bará -- Conocimiento local sobre especies de abejas más representativas -- Cómo obtener miel -- Experiencia de cría: datos de seguimiento -- La colonia -- Comportamiento de las abejasna33 página

    Análisis de la gestión de innovación en una empresa española de consultoría de negocios intensiva en conocimiento con participación en Perú

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    El presente trabajo de tesis está centrado en el análisis de la gestión y proceso de innovación de una firma de consultoría española (XYZ) con sede en el Perú en los últimos 6 años. Al ser esta una empresa que brinda Servicios de Negocios Intensivos en Conocimiento (KIBS), el proceso de innovación sigue unas características muy particulares que difieren de la tradicional innovación tecnológica en el sector industrial (tangible o intangible). Es por ello que se utilizó algunos modelos ya establecidos en la literatura respectiva y se los adaptó a la realidad de la firma XYZ. El estudio realizado tiene como base el estudio de casos: cuatro proyectos exitosos de la empresa XYZ en clientes peruanos del sector financiero y de telecomunicaciones. Junto con la información recopilada y las recientes teorías acerca de la innovación en servicios, se llegó a una serie de conclusiones en materia de innovación dentro de la firma XYZ y a una propuesta de valor para esta. Dentro de las principales conclusiones, podría decirse que la firma de consultoría XYZ es facilitadora de innovación para sus empresas clientes; que, en general, las KIBS generan innovación (de carácter ad-hoc) en el encuentro del servicio (interacción con el cliente) y que las empresas de servicios innovan con mayor frecuencia en el qué (servicio en sí) y menos en el cómo (proceso de entrega).Tesi

    Cerebral Infarction Associated with Cocaine Use

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    We report the case of a young man with an acute infarction of the left putamen and caudate nucleus, whose symptoms appeared six hours after intranasal use of approximately 0.5 g of cocaine hydrochloride. It seems probable that in this patient cocaine consumption played a role in the development of stroke

    Učinak metformina na parametre pokretljivosti sperme miševa i goveda

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    Sperm motility is one of the most relevant parameters related to the fertilizing capability of the spermatozoa. Understanding the anatomy and physiology of sperm flagellum allows for the use of diverse molecules for improving sperm motility, such as metformin. Metformin is a molecule known to stimulate the capability of the cell to uptake and metabolize its energy substrate, acting as an activator of AMP kinase. Its activation leads to the phosphorylation of several substrates implicated in the hyperactivation of the flagellum, as a previous step for the appropriate fertility of the spermatozoa. This paper presents the results of experiments testing the effect of metformin in bull and murine spermatozoa, and reviews aspects related to the use of energy substrate by the spermatozoa, and the molecular mechanisms implicated in metformin role on sperm motility. Since semen analysis is always performed in Eppendorf tubes, whereas the capacitation of sperm cells for in vitro fertilization is performed in drops, we evaluated if there were differences in CASA parameters between sperm cells evaluated in Eppendorf tubes versus drops.Pokretljivost sperme jedan je od najrelevantnijih parametara povezanih s oplodnim kapacitetom spermija. Razumijevanje anatomije i fiziologije flageluma spermija omogućuje uporabu različitih molekula za poboljšanje pokretljivosti sperme poput metformina. Metformin je molekula za koju je poznato da stimulira sposobnost stanice da unese i metabolizira svoj energetski supstrat, djelujući kao aktivator protein-kinaze aktivirane mitogenom (MAPK), čija aktivacija dovodi do fosforilacije nekoliko supstrata uključenih u hiperaktivaciju flageluma, kao prethodni korak za odgovarajuću plodnost spermija. U ovom su radu predstavljeni rezultati pokusa ispitivanja učinka metformina na spermije bika i miša te pregled onih aspekata povezanih s uporabom energetskog supstrata od strane spermija te molekularnih mehanizama uključenih u ulogu metformina u pokretljivost spreme. Uz to, obzirom da se analiza spermija uvijek obavlja u eppendorf epruvetama, dok se kapacitacija spermija za in vitro oplodnju obavlja u kapljicama, željeli bismo ocijeniti postoje li razlike u CASA (računalno potpomognuta analiza spermija) parametrima između spermija procijenjenih u eppendorf epruvetama u usporedbi s kapljicama

    Association of a Genetic Risk Score With Body Mass Index Across Different Birth Cohorts

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    Importance Many genetic variants are associated with body mass index (BMI). Associations may have changed with the 20th century obesity epidemic and may differ for black vs white individuals. Objective Using birth cohort as an indicator for exposure to obesogenic environment, to evaluate whether genetic predisposition to higher BMI has a larger magnitude of association among adults from more recent birth cohorts, who were exposed to the obesity epidemic at younger ages. Design, Setting, and Participants Observational study of 8788 adults in the US national Health and Retirement Study who were aged 50 years and older, born between 1900 and 1958, with as many as 12 BMI assessments from 1992 to 2014. Exposures A multilocus genetic risk score for BMI (GRS-BMI), calculated as the weighted sum of alleles of 29 single nucleotide polymorphisms associated with BMI, with weights equal to the published per-allele effects. The GRS-BMI represents how much each person’s BMI is expected to differ, based on genetic background (with respect to these 29 loci), from the BMI of a sample member with median genetic risk. The median-centered GRS-BMI ranged from −1.68 to 2.01. Main Outcomes and Measures BMI based on self-reported height and weight. Results GRS-BMI was significantly associated with BMI among white participants (n = 7482; mean age at first assessment, 59 years; 3373 [45%] were men; P \u3c.001) and among black participants (n = 1306; mean age at first assessment, 57 years; 505 [39%] were men; P \u3c.001) but accounted for 0.99% of variation in BMI among white participants and 1.37% among black participants. In multilevel models accounting for age, the magnitude of associations of GRS-BMI with BMI were larger for more recent birth cohorts. For example, among white participants, each unit higher GRS-BMI was associated with a difference in BMI of 1.37 (95% CI, 0.93 to 1.80) if born after 1943, and 0.17 (95% CI, −0.55 to 0.89) if born before 1924 (P = .006). For black participants, each unit higher GRS-BMI was associated with a difference in BMI of 3.70 (95% CI, 2.42 to 4.97) if born after 1943, and 1.44 (95% CI, −1.40 to 4.29) if born before 1924. Conclusions and Relevance For participants born between 1900 and 1958, the magnitude of association between BMI and a genetic risk score for BMI was larger among persons born in later cohorts. This suggests that associations of known genetic variants with BMI may be modified by obesogenic environments
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