40 research outputs found
SAWLnet: Sensitivity AWare Location cloaking on road-NETworks
No full textAbstract—Location based queries are increasingly common
in mobile applications, and the associated privacy issues have
become a hot research topic in the last years. Most of the
current approaches, however, do not account for the location of
potentially sensitive places and for constraints on the movement
of users, such as speed limits or network contraints.
In this demo we present different deployment scenarios of
a privacy-preserving framework for the protection of sensitive
positions in real time trajectories. We assume that the sensitivity
of users’ positions depends on the spatial context, while the users’
movement is confined to road networks and places. Further, the
users are non-anonymous, as in the case of geo-social network
members who agree to share their exact position whenever it
does not fall within a sensitive place, e.g. a hospital.
We will show that our proposal is suitable for different classes
of devices and can be integrated in different kind of location
based applications
Privacy-preserving sharing of sensitive semantic locations under road-network constraints
No full textThis paper presents a privacy-preserving framework
for the protection of sensitive positions in real time trajectories.
We assume a scenario in which the sensitivity of user’s positions
is space-varying, and so depends on the spatial context, while
the user’s movement is confined to road networks and places.
Typical users are the non-anonymous members of a geo-social
network who agree to share their exact position whenever such
position does not fall within a sensitive place, e.g. a hospital.
Suspending location sharing while the user is inside a sensitive
place is not an appropriate solution because the user’s stopovers
can be easily inferred from the user’s trace. In this paper we
present an extension of the semantic location cloaking model
originally developed for the cloaking of non-correlated positions
in an unconstrained space. We investigate different algorithms
for the generation of cloaked regions over the graph representing
the urban setting. We also integrate methods to prevent velocity based
linkage attacks. Finally we evaluate experimentally the
algorithms using a real data set
Volumen íntegro
No full textTaula de continguts
Dels editors
Mari Carmen Campoy CubilloMiguel F. Ruiz Garrido
Articles
Multimodalitat en sessions de discussió: compilació i pedagogia de corpus.
Mercedes Querol-Julián
Una aproximació al llenguatge basat en corpus i les funcions multimodals en els intercanvis comunicatius des de molt jove per al disseny de continguts adaptats per hipermèdia.
Alejandro Curado Fuentes
Sonar natural: millorar les habilitats de presentació oral.
Maria Grazia Busà
Canvi d'espais, mentalitats en expansió: Cap a les literacies L2 en un curs multimodal de comprensió lectora.
Heidi VaaralaJuha Jalkanen
Multimodalitat i comprensió auditiva: comprovació i implementació de materials d'aula.
Elena Domínguez RomeroCarmen Maíz Arévalo
Crítiques de llibres i multimèdia
Gena R. Bennet. Utilitzar CORPORA a l'Aula d'Aprenentatge d'Idiomes: Corpus Linguistics for Teachers.
Nur Yigitoglu
Andre Gillet. Utilitzant l'anglès per a propòsits acadèmics. Guia per a estudiants en educació superior.
Mónica-Stella Cárdenas-ClarósTable of Contents
From the editors
Mari Carmen Campoy CubilloMiguel F. Ruiz Garrido
Articles
Multimodality in discussion sessions: corpus compilation and pedagogical.
Mercedes Querol-Julián
An approach to corpus-based language and multimodal features in communicative exchanges at an early age for adapted hypermedia content design.
Alejandro Curado Fuentes
Sounding natural: improving oral presentation skills.
Maria Grazia Busà
Changing spaces, expanding mindsets: Towards L2 literacies on a multimodal reading comprehension course.
Heidi VaaralaJuha Jalkanen
Multimodality and listening comprehension: Testing and implementing classroom material.
Elena Domínguez RomeroCarmen Maíz Arévalo
Book and Multimedia Reviews
Gena R. Bennet. Using CORPORA in the Language Learning Classroom: Corpus Linguistics for Teachers.
Nur Yigitoglu
Andre Gillet. Using English for Academic Purposes. A Guide for Students in Higher Education.
Mónica-Stella Cárdenas-ClarósTabla de contenido
De los editores
Mari Carmen Campoy CubilloMiguel F. Ruiz Garrido
Artículos
Multimodalidad en sesiones de discusión: recopilación de corpus y pedagógica.
Mercedes Querol-Julián
Un acercamiento al lenguaje basado en corpus y características multimodales en intercambios comunicativos desde una edad temprana para el diseño de contenido hipermedia adaptado.
Alejandro Curado Fuentes
Sonar natural: mejorar las habilidades de presentación oral.
Maria Grazia Busà
Cambiando espacios, expandiendo la mentalidad: hacia alfabetizaciones de L2 en un curso de comprensión de lectura multimodal.
Heidi VaaralaJuha Jalkanen
Multimodalidad y comprensión auditiva: prueba e implementación de material de aula.
Elena Domínguez RomeroCarmen Maíz Arévalo
Reseñas de libros y multimedia
Gena R. Bennet. Uso de CORPORA en el aula de aprendizaje de idiomas: lingüística de corpus para profesores.
Nur Yigitoglu
Andre Gillet. Uso del inglés con fines académicos. Una guía para estudiantes de educación superior.
Mónica-Stella Cárdenas-Claró
Using CORPORA in the Language Learning Classroom: Corpus Linguistics for Teachers: Gena R. Bennet
No full textReviewed by Nur YigitogluDepartment of Applied Linguistics and ESLGeorgia State University, USA
The interest in using corpora and corpus-based materials in language teaching and research continues to grow. Over the past few years, research by second language teaching specialists has emphasized the importance of using corpora and corpus-based materials in the second language learning classroom. This is true not only for research articles (Conrad 1999, Cortes 2007), but also for academic conferences such as those organized by the American Association of Corpus Linguistics (AACL). In Using CORPORA in the Language Learning Classroom: Corpus Linguistics for Teachers, Bennett aims to make the ideas of corpus linguistics accessible to second language teachers, graduate students specializing in applied linguistics, and teacher-trainers working with language instructors. The volume is divided into three main parts and eight chapters, and also includes two appendices and a conceptual index.Reviewed by Nur YigitogluDepartment of Applied Linguistics and ESLGeorgia State University, USA
The interest in using corpora and corpus-based materials in language teaching and research continues to grow. Over the past few years, research by second language teaching specialists has emphasized the importance of using corpora and corpus-based materials in the second language learning classroom. This is true not only for research articles (Conrad 1999, Cortes 2007), but also for academic conferences such as those organized by the American Association of Corpus Linguistics (AACL). In Using CORPORA in the Language Learning Classroom: Corpus Linguistics for Teachers, Bennett aims to make the ideas of corpus linguistics accessible to second language teachers, graduate students specializing in applied linguistics, and teacher-trainers working with language instructors. The volume is divided into three main parts and eight chapters, and also includes two appendices and a conceptual index.Reviewed by Nur YigitogluDepartment of Applied Linguistics and ESLGeorgia State University, USA
The interest in using corpora and corpus-based materials in language teaching and research continues to grow. Over the past few years, research by second language teaching specialists has emphasized the importance of using corpora and corpus-based materials in the second language learning classroom. This is true not only for research articles (Conrad 1999, Cortes 2007), but also for academic conferences such as those organized by the American Association of Corpus Linguistics (AACL). In Using CORPORA in the Language Learning Classroom: Corpus Linguistics for Teachers, Bennett aims to make the ideas of corpus linguistics accessible to second language teachers, graduate students specializing in applied linguistics, and teacher-trainers working with language instructors. The volume is divided into three main parts and eight chapters, and also includes two appendices and a conceptual index
Use of chemically modified poly( ethylene terephthalate)-g-(acryl amide) fibers for α-amylase immobilization
No full textAcryl amide grafted Poly(ethylene terephthalate) (AAm-g-PET) fiber was used for covalent coupling of alpha-amylase. The amide groups of Poly(acryl amide) were converted to the amine groups by Hofmann degradation reaction. The amine groups were activated by glutaraldehyde, before coupling of the enzyme. The free alpha-amylase and immobilized alpha-amylase were characterized by determining the activity profile as function of pH, temperature, thermal stability and storage stability. For the immobilized alpha-amylase, operational stability was also determined. The immobilization of alpha-amylase on support caused the optimal reaction pH to shift from 5 to 6. The maximum activity of the free and immobilized enzymes occurred at 50 degrees C. K-m for the immobilized system was higher than that for the free enzyme. The activity of the free enzyme ended in 30 days, whereas the activity of the immobilized enzyme lasted for 60 days at storage conditions. alpha-Amylase immobilized on matrix maintained 40% of its original activity after 30 times of repeated use
Use of 4-vinylpyridine and 2-hydroxyethylmethacrylate monomer mixture grafted poly(ethylene terephthalate) fibers for removal of congo red from aqueous solution
No full textArslan, Metin/0000-0001-9432-6877In this study, a novel fibrous adsorbent made by grafting 4-vinyl pyridine (4-VP) and 2-hydroxyethylmethacrylate (HEMA) monomer mixture onto poly(ethylene terephthalate) (PET) fibers was used for removal of Congo red (CR) in aqueous solutions by a batch equilibration technique. The influence of treatment time, pH of solution, dyes concentration, and reaction temperature on adsorbed amount was investigated. Adsorption time of 60 min. was found sufficient to reach adsorption equilibrium for CR. It was found that the adsorption isotherm of CR fits to Langmuir type isotherms. The highest adsorption capacity was found to be 11.87 mg CR per gram adsorbent. The adsorption rate of CR is much higher on the comonomers grafted PET fibers than on the ungrafted PET fibers. CR was removed 97% when the initial dye concentration was 5 mg L-1 and 38% at 150 mg L-1 by monomers mixture grafted PET fibers. The adsorption of the dye was endothermic in nature (Delta H degrees = 45.3 KJmol(-1)). It was found that the reactive fibers are stable and regenerate by acid without losing its activity
Comparison of dose accuracy between 2D array detectors and Epid for IMRT of nasopharynx cancer
No full textγ-rigid solution of the Bohr Hamiltonian for γ=30° compared to the E(5) critical point symmetry
No full textAbstractA γ-rigid solution of the Bohr Hamiltonian for γ=30° is derived, its ground state band being related to the second order Casimir operator of the Euclidean algebra E(4). Parameter-free (up to overall scale factors) predictions for spectra and B(E2) transition rates are in close agreement to the E(5) critical point symmetry, as well as to experimental data in the Xe region around A=130
Controlled release of indomethacin from crosslinked alginate beads
No full textBeads of the sodium alginate ( NaAlg) were prepared by dropping aqueous sodium alginate ( NaAlg) into glutaraldehyde ( GA) as a crosslinker and HCl as a catalyst mixture solution. Beads prepared were used to deliver a model non-steroid, anti-inflammatory drug, indomethacin ( IM). The beads were characterized with Fourier transform infrared spectroscopy ( FTIR), differential scanning calorimetry ( DSC) and scanning electron microscopy ( SEM). Chemical stability of the IM after encapsulation into beads was confirmed by FTIR. SEM photograph indicated that alginate bead has spherical shape and rough surface. Preparation conditions of the beads were optimized by considering the percentage of entrapment efficiency, swelling capacity of the beads, particle size and their release data. In vitro release studies were performed in simulated gastric fluid ( pH 1.2) for the initial 2 h, followed by simulated intestinal fluid ( pH 7.4) for 4 h. Effects of variables such as, GA concentration, exposure time to GA, drug/ polymer ( d/ p) ratio and percentage of HCl on the release of the IM were investigated. It was observed that, IM release from the beads decreased with increasing GA concentration, exposure time to GA, d/ p ratio and percentage of HCl. The highest cumulative IM release obtained at the end of 6 h was 68% for alginate beads which were prepared with 0.5% HCl. On the other hand the least cumulative IM release obtained was to be 20 % for alginate beads which were prepared with 30 min exposure time to GA. In order to understand the crosslinking of the polymeric matrix, the molar mass between crosslinks were calculated using the swelling parameters. It was also found from the swelling experiments that swelling degree of the beads increases with increase in the temperature. The release data have been fitted to an empirical equation to estimate the kinetic parameters. The diffusion coefficient was also calculated for the transport of the drug through the polymeric beads. Values of these parameters were found to be consistent with the release data
Comparison of the E(5) critical point symmetry to the gamma-rigid solution of the Bohr Hamiltonian for gamma=30 degrees
No full textA gamma-rigid solution of the Bohr Hamiltonian for gamma=30 degrees is derived. Bohr Hamiltonians beta-part being related to the second order Casimir operator of the Euclidean algebra E(4). The solution is called Z(4) since it is corresponds to the Z(5) model with the gamma variable "frozen". Parameter-free (up to overall scale factors) predictions for spectra and B(E2) transition rates are in close agreement to the E(5) critical point symmetry as well as to the experimental data in the Xe region around A=130
