QR-Learning: la romanización en la enseñanza de Historia

El proceso de enseñanza y aprendizaje en Ciencias Sociales permite el uso, cada vez en mayor medida, de dispositivos móviles y tecnológicos para promover la interacción del alumnado y apoyar así su propia construcción del aprendizaje. En este caso, se ha desarrollado una experiencia de innovación docente con el alumnado del Grado de Educación Primaria de la Universidad de Alicante, en la cual han trabajado de manera cooperativa los contenidos referidos al proceso de Romanización, y lo han hecho investigando y creando materiales didácticos mediante la aplicación de códigos QR en la asignatura de Didáctica de la Historia. Antes de comenzar la experiencia se detectaron los conocimientos previos del alumnado para conocer lo que previamente ya sabían de la romanización, a continuación, y trabajando en grupo, crearon un blog como soporte de la información que enlazarán con el código QR. Por último, la información volcada sobre el blog, fue presentada a través del código tratando que fuera lo más variado y didáctica posible.

A parallel QR-algorithm for tridiagonal symmetric matrices /

"NSF-OCA-GJ-36936-000008."

QRT: A Qr-based tridiagonalization algorithm for nonsymmetric matrices

The stable similarity reduction of a nonsymmetric square matrix to tridiagonal form has been a long-standing problem in numerical linear algebra. The biorthogonal Lanczos process is in principle a candidate method for this task, but in practice it is confined to sparse matrices and is restarted periodically because roundoff errors affect its three-term recurrence scheme and degrade the biorthogonality after a few steps. This adds to its vulnerability to serious breakdowns or near-breakdowns, the handling of which involves recovery strategies such as the look-ahead technique, which needs a careful implementation to produce a block-tridiagonal form with unpredictable block sizes. Other candidate methods, geared generally towards full matrices, rely on elementary similarity transformations that are prone to numerical instabilities. Such concomitant difficulties have hampered finding a satisfactory solution to the problem for either sparse or full matrices. This study focuses primarily on full matrices. After outlining earlier tridiagonalization algorithms from within a general framework, we present a new elimination technique combining orthogonal similarity transformations that are stable. We also discuss heuristics to circumvent breakdowns. Applications of this study include eigenvalue calculation and the approximation of matrix functions.

Extending the GUIDE@HAND Tourist Guide Application with QR Codes for Museum Learning

The following paper attempts to encompass the opportunities for applying QR codes for museums and exhibits through the example of the Hungarian Museum of Environmental Protection and Water Management (Esztergom, Hungary). Besides providing interactivity in the museum for the mobile phone generation through the utilization of a device and a method that they are familiar with, it is important to explain how and why it is worthwhile to “adorn” the exhibits with these codes. In this paper we also touch upon the technical issues of how an existing mobile phone application can be incorporated into and used for the presentation of the museum.

Mobile Exploring of the Bulgarian Iconography through QR Codes in the GUIDE@HAND Tourist Guide Application

The following paper presents an application of QR code marking of digital iconographical collections for their outdoor mobile access and exploring through the GUIDE@HAND audio tourist guide.

Aplicación web basado en el programa de reaprovisionamiento continuo utilizando la tecnología de códigos QR para mejorar los procesos de distribución, en una empresa comercializadora de vehículos

Tesis de pregrado

Mobiili oppimateriaali ja QR-koodit käsityön opetuksessa ja konekohtaisessa perehdytyksessä

Tämän tutkimuksen tarkoituksena on selvittää, miten Turun yliopiston Rauman yksikön opiskelijat kokevat QR- koodien avulla esitettävien perehdytysvideoiden hyödyntävän aineenhallintaansa ja työturvallisuustaitoja työstökoneiden kanssa työskenneltäessä. Lisäksi tutkitaan, kokiko jokin tietty opiskelijaryhmä videoiden parantavan aineenhallintaansa työstökoneiden käytössä paremmin. Tutkimuksen teoriaosassa käsitellään käsityötä oppiaineena, oppimisympäristöä, verkko-opetusta sekä työturvallisuutta. Teoriaosan lopussa käydään läpi taidon opettamisen perinteisiä teorioita. Teoriaosan perusteella on muodostettu kyselylomake, joka perustuu verkko-oppimateriaalin laatukriteereihin. Laatukriteerit ovat vaikuttaneet perehdytysvideoiden tekemiseen sekä QR-koodien sijoitteluun. Tutkimuksessa tehtiin kysely Turun yliopiston opettajankoulutuslaitoksen Rauman yksikön opiskelijoille. Kysely oli täytettävissä Webropol -sivustolla. Linkki kyselyyn oli sijoitettuna työstökoneiden läheisyyteen, samasta paperista löytyi myös linkki perehdytysvideoon. Linkit aukesivat mobiililaitteen QR-koodeja lukevan sovelluksen avulla. Tutkimus on strategialtaan kvantitatiivinen Survey-tutkimus. Kyselyyn vastasi 39 opiskelijaa ja kyselystä saatu aineisto analysoitiin SPSS ohjelmalla. Tutkimustulokset saatiin vertailemalla keskeisiä tunnuslukuja sekä korrelaatiotestejä ja varianssianalyysejä hyödyntämällä. Tutkimuksen tulosten perusteella perehdytysvideot hyödyttävät tehokkaiten opiskelijoita, joiden aikaisemmat taidot ovat heikot. Aikaisempien taitojen ja perehdytysvideosta saadun hyödyn välillä huomattiin selkeä korrelaatio. Perehdytysvideoiden saavutettavuudella ja käytettävyydellä ei nähty keskinäistä korrelaatiota. Tulosten perusteella huomattiin, että luokanopettajaopiskelijat arvioivat omat taitonsa työstökoneiden käytössä heikommaksi, jolloin he myös hyötyivät perehdytysvideoista enemmän.

Cambios corticales en los dientes anteriores superiores e inferiores con Brackets convencionales, Damon y biofuncional QR en pacientes de trece a veinte y cuatro años

En el mercado existen varios sistemas de tratamiento en ortodoncia, los cuales deben ser estudiados para evitar que causen alteraciones en el periodonto, especialmente en los procesos alveolares corticales, por lo que el objetivo de este estudio fue conocer los cambios óseos alveolares, sean reabsorciones, aposiciones o ningún cambio óseo. Para realizar el estudio, se tomó como muestra tres sistemas de tratamiento: Sistema de Autoligado Damon, Sistema Biofuncional QR y Sistemas Convencionales Roth y MBT, estos brackets se aplicaron en 18 pacientes (seis de cada sistema), los cuales fueron sometidos a una tomografía antes del tratamiento y otra después de finalizada la etapa de alineación y nivelación. En los estudios tomográficos se realizaron trazados para medir en milímetros las corticales alveolares vestibulares, palatina y lingual, de los seis dientes anteriores superiores e inferiores, siendo la muestra total de 216 dientes. Para obtener los resultados del estudio, se ingresaron los datos recolectados en una hoja de cálculo Excel y procesados estadísticamente mediante el software SPSS versión 22, con las pruebas ANOVA y Tukey, obteniendo como resultados en el promedio de reabsorción ósea total p= 0,05 y con el Sistema Biofuncional QR una significancia de p= 0,025, en este último se demostró la presencia de aposición en la cortical lingual mandibular. Se concluyó que todos los sistemas de tratamiento causan reabsorciones óseas, siendo el Sistema Damon el de mayor reabsorción, seguido del Sistema convencional y luego el Sistema Biofuncional QR, produciendo este último una aposición estadísticamente significante. En los dientes anterosuperiores no existieron cambios óseos significativos y en los dientes anteroinferiores las mayores reabsorciones fueron en las piezas 42 y 32 y aposición en la pieza 41

QR-VEY: Una piattaforma software per la creazione di sondaggi basata sulla tecnologia del QR-Code

Le metodologie per la raccolta delle idee e delle opinioni si sono evolute a pari passo con il progresso tecnologico: dalla semplice comunicazione orale si è passati alla diffusione cartacea, fino a che l'introduzione e l'evoluzione di internet non hanno portato alla digitalizzazione e informatizzazione del processo. Tale progresso ha reso possibile l'abbattimento di ogni barriera fisica: se in precedenza la diffusione di un sondaggio era limitata dall'effettiva possibilità di distribuzione del sondaggio stesso, lo sviluppo della rete globale ha esteso tale possibilità (virtualmente) a tutto il mondo. Nonostante sia un miglioramento non indifferente, è importante notare come la valorizzazione della diffusione di un sondaggio abbia inevitabilmente portato a trascurarne le proprietà e i vantaggi intrinsechi legati alla sua diffusione prettamente locale. Ad esempio, un sondaggio che mira a valutare la soddisfazione degli utenti riguardo alla recente introduzione di una nuova linea di laptop ottiene un guadagno enorme dall'informatizzazione, e dunque delocalizzazione, del processo di raccolta dati; dall'altro lato, un sondaggio che ha come scopo la valutazione dell'impatto sui cittadini di un recente rinnovamento degli impianti di illuminazione stradale ha un guadagno pressoché nullo. L'idea alla base di QR-VEY è la ricerca di un ponte tra le metodologie classiche e quelle moderne, in modo da poter sfruttare le proprietà di entrambe le soluzioni. Tale ponte è stato identificato nella tecnologia del QR-Code: è possibile utilizzare un generico supporto che presenti proprietà di localizzazione, come un foglio cartaceo, ma anche un proiettore di una conferenza, come base per la visualizzazione di tale codice, ed associare alla scansione dello stesso funzionalità automatizzate di raccolta di dati e opinioni.

Análise do jogo de goalball : modelação e interpretação dos padrões de jogo da Paralimpíada de Pequim 2008

Universidade Estadual de Campinas . Faculdade de Educação Física

Teste de banco com carga continua para analise do volume de oxigenio (VO2) predito e analisado por tempo de esforço em pessoas treinadas (TRD), ativas (ATV) e destreinadas (DTR) a partir dos 13 anos : proposta de validação

Universidade Estadual de Campinas . Faculdade de Educação Física

Optimization of modal filters based on arrays of piezoelectric sensors

Modal filters may be obtained by a properly designed weighted sum of the output signals of an array of sensors distributed on the host structure. Although several research groups have been interested in techniques for designing and implementing modal filters based on a given array of sensors, the effect of the array topology on the effectiveness of the modal filter has received much less attention. In particular, it is known that some parameters, such as size, shape and location of a sensor, are very important in determining the observability of a vibration mode. Hence, this paper presents a methodology for the topological optimization of an array of sensors in order to maximize the effectiveness of a set of selected modal filters. This is done using a genetic algorithm optimization technique for the selection of 12 piezoceramic sensors from an array of 36 piezoceramic sensors regularly distributed on an aluminum plate, which maximize the filtering performance, over a given frequency range, of a set of modal filters, each one aiming to isolate one of the first vibration modes. The vectors of the weighting coefficients for each modal filter are evaluated using QR decomposition of the complex frequency response function matrix. Results show that the array topology is not very important for lower frequencies but it greatly affects the filter effectiveness for higher frequencies. Therefore, it is possible to improve the effectiveness and frequency range of a set of modal filters by optimizing the topology of an array of sensors. Indeed, using 12 properly located piezoceramic sensors bonded on an aluminum plate it is shown that the frequency range of a set of modal filters may be enlarged by 25-50%.

Weathering of hydrocarbons in mangrove sediments: testing the effects of using dispersants to treat oil spills

This field study was a combined chemical and biological investigation of the relative effects of using dispersants to treat oil spills impacting mangrove habitats. The aim of the chemistry was to determine whether dispersant affected the short- or long-term composition of a medium range crude oil (Gippsland) stranded in a tropical mangrove environment in Queensland, Australia. Sediment cores from three replicate plots of each treatment (oil only and oil plus dispersant) were analyzed for total hydrocarbons and for individual molecular markers (alkanes, aromatics, triterpanes, and steranes). Sediments were collected at 2 days, then 1, 7, 13 and 22 months post-spill. Over this time, oil in the six treated plots decreased exponentially from 36.6 +/- 16.5 to 1.2 +/- 0.8 mg/g dry wt. There was no statistical difference in initial oil concentrations, penetration of oil to depth, or in the rates of oil dissipation between oiled or dispersed oil plots. At 13 months, alkanes were >50% degraded, aromatics were similar to 30% degraded based upon ratios of labile to resistant markers. However, there was no change in the triterpane or sterane biomarker signatures of the retained oil. This is of general forensic interest for pollution events. The predominant removal processes were evaporation (less than or equal to 27%) and dissolution (greater than or equal to 56%), with a lag-phase of 1 month before the start of significant microbial degradation (less than or equal to 7%). The most resistant fraction of the oil that remained after 7 months (the higher molecular weight hydrocarbons) correlated with the initial total organic carbon content of the soil. Removal rate in the Queensland mangroves was significantly faster than that observed in the Caribbean and was related to tidal flushing. (C) 1999 Elsevier Science Ltd. All rights reserved.

Alternatives for parallel Krylov subspace basis computation

Numerical methods related to Krylov subspaces are widely used in large sparse numerical linear algebra. Vectors in these subspaces are manipulated via their representation onto orthonormal bases. Nowadays, on serial computers, the method of Arnoldi is considered as a reliable technique for constructing such bases. However, although easily parallelizable, this technique is not as scalable as expected for communications. In this work we examine alternative methods aimed at overcoming this drawback. Since they retrieve upon completion the same information as Arnoldi's algorithm does, they enable us to design a wide family of stable and scalable Krylov approximation methods for various parallel environments. We present timing results obtained from their implementation on two distributed-memory multiprocessor supercomputers: the Intel Paragon and the IBM Scalable POWERparallel SP2. (C) 1997 by John Wiley & Sons, Ltd.

Efficient time-independent wave packet scattering calculations within a Lanczos subspace: H+O-2 (J=0) state-to-state reaction probabilities

An efficient Lanczos subspace method has been devised for calculating state-to-state reaction probabilities. The method recasts the time-independent wave packet Lippmann-Schwinger equation [Kouri , Chem. Phys. Lett. 203, 166 (1993)] inside a tridiagonal (Lanczos) representation in which action of the causal Green's operator is affected easily with a QR algorithm. The method is designed to yield all state-to-state reaction probabilities from a given reactant-channel wave packet using a single Lanczos subspace; the spectral properties of the tridiagonal Hamiltonian allow calculations to be undertaken at arbitrary energies within the spectral range of the initial wave packet. The method is applied to a H+O-2 system (J=0), and the results indicate the approach is accurate and stable. (C) 2002 American Institute of Physics.