2,598 research outputs found
Indexing and retrieval of multimodal lecture recordings from open repositories for personalized access in modern learning settings
An increasing number of lecture recordings are available to complement face-to face and the more conventional content-based e-learning approaches. These recordings provide additional channels for remote students and time-independent access to the lectures. Many universities offer even complete series of recordings of hundreds of courses which are available for public access and this service provides added value for users outside the university. The lecture recordings show the use of a great variety of media or modalities (such as video, audiom lecture media, presentation behaviour) and formats. Insofar, none of the existing systems and services have sufficient retrieval functionality or support appropriate interfaces to enable searching for lecture recordings over several repositories. This situation has motivated us to initiate research on a lecture recording indexing and retrieval system for knowledge transfer and learning activities in various settings. This system is built on our former experiences and prototypes developed within the MISTRAL research project. In this paper we outline requirements for an enhanced lecture recording retrieval system, introduce our solution and prototype, and discuss the initial results and findings
Implicit Regularization and Renormalization of QCD
We apply the Implicit Regularization Technique (IR) in a non-abelian gauge
theory. We show that IR preserves gauge symmetry as encoded in relations
between the renormalizations constants required by the Slavnov-Taylor
identities at the one loop level of QCD. Moreover, we show that the technique
handles divergencies in massive and massless QFT on equal footing.Comment: (11 pages, 2 figures
A self-clinching fastener for hidden lap joints
This paper presents a new self-clinching fastener to connect two sheets (or plates), made from similar or
dissimilar materials, placed over one another by means of a mechanical form-closed joint that is hidden
inside the sheets. The development of the fastener, the definition of its main design variables and the
identification of its workability limits are carried out by means of a combined experimental and numerical
simulation work based on finite elements. It is shown that self-clinching by pressing the two overlapped
sheets against each other to displace material around the annular groove of the fastener shank and create
undercuts in both sheets requires an appropriate choice of the design variables. Wrong values of the design
variables resulting in lack or excess of material displaced by plastic flow gives rise to inappropriate lap joints
that cannot be used in production. The new proposed fastener allows, for the first time ever, joining by
forming with the use of auxiliary elements that are harder than the sheet materials to fabricate invisible
joints with no material protrusions in applications requiring minimum installation spaceinfo:eu-repo/semantics/publishedVersio
New Criteria of Indication and Selection of Patients to Cochlear Implant
Numerous changes continue to occur in cochlear implant candidacy. In general, these have been accompanied by concomitant and satisfactory changes in surgical techniques. Together, this has advanced the utility and safety of cochlear implantation. Most devices are now approved for use in patients with severe to profound unilateral hearing loss rather then the prior requirement of a bilateral profound loss. Furthermore, studies have begun utilizing short electrode arrays for shallow insertion in patients with considerable low-frequency residual hearing. This technique will allow the recipient to continue to use acoustically amplified hearing for the low frequencies simultaneously with a cochlear implant for the high frequencies. The advances in design of, and indications for, cochlear implants have been matched by improvements in surgical techniques and decrease in complications. The resulting improvements in safety and efficacy have further encouraged the use of these devices. This paper will review the new concepts in the candidacy of cochlear implant. Medline data base was used to search articles dealing with the following topics: cochlear implant in younger children, cochlear implant and hearing preservation, cochlear implant for unilateral deafness and tinnitus, genetic hearing loss and cochlear implant, bilateral cochlear implant, neuropathy and cochlear implant and neural plasticity, and the selection of patients for cochlear implant
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