Search results for "Access"
showing 10 items of 1232 documents
Do Sign Language Videos Improve Web Navigation for Deaf Signer Users?
2010
The efficacy of video-based sign language (SL) navigation aids to improve Web search for Deaf Signers was tested by two experiments. Experiment 1 compared 2 navigation aids based on text hyperlinks linked to embedded SL videos, which differed in the spatial contiguity between the text hyperlink and SL video (contiguous vs. distant). Deaf Signers’ performance was similar in Web search using both aids, but a positive correlation between their word categorization abilities and search efficiency appeared in the distant condition. In Experiment 2, the contiguous condition was compared with a text-only hyperlink condition. Deaf Signers became less disorientated (used shorter paths to find the tar…
Hepatitis B protein HBx binds the DLEU2 lncRNA to sustain cccDNA and host cancer-related gene transcription.
2019
Objective: The HBV HBx regulatory protein is required for transcription from the covalently closed circular DNA (cccDNA) minichromosome and affects the epigenetic control of both viral and host cellular chromatin. Design: We explored, in relevant cellular models of HBV replication, the functional consequences of HBx interaction with DLEU2, a long non-coding RNA (lncRNA) expressed in the liver and increased in human hepatocellular carcinoma (HCC), in the regulation of host target genes and the HBV cccDNA. Results: We show that HBx binds the promoter region, enhances the transcription and induces the accumulation of DLEU2 in infected hepatocytes. We found that nuclear DLEU2 directly binds HBx…
Virus replication and virion export in X-deficient hepatitis B virus transgenic mice
2002
The function of the X protein (pX) in the replication cycle of mammalian hepadnaviruses is enigmatic. Using tissue culture experiments it has been shown that the X gene product is not central to hepatitis B virus (HBV) replication and virion export. However, at present it is still unclear whether this also applies to the in vivo situation. Using a terminally redundant X-deficient HBV DNA construct, transgenic mice were established that exhibited high-level expression of the viral core protein in liver and kidneys. Importantly, replicative DNA intermediates and mature viral genomes could be detected in the liver and serum of these mice, respectively. These findings indicate that, in the in v…
Adaptive Collision Avoidance through Implicit Acknowledgments in WSNs
2008
The large number of nodes, typical of many sensor network deployments, and the well-known hidden terminal problem make collision avoidance an essential goal for the actual employment of WSN technology. Collision avoidance is traditionally dealt with at the MAC Layer and plenty of different solutions have been proposed, which however have encountered limited diffusion because of their incompatibility with commonly available devices.In this paper we propose an approach to collision avoidance which is designed to work over a standard MAC Layer, namely the IEEE 802.15.4 MAC, and is based on application-controlled delays of packet transmission times. The proposed scheme is simple, decentralized …
Cooperative RTS/CTS MAC with relay selection in distributed wireless networks
2009
This paper proposes a cooperative multiple access protocol based on the Distributed Coordination Function (DCF) Request-To-Send/Clear-To-Send (RTS/CTS) scheme for distributed wireless networks. It answers three key questions concerning cooperation from the network perspective, namely when to cooperate, whom to cooperate with and how to protect cooperative transmissions. According to our protocol, the cooperation is initiated only if the direct transmission fails. An optimal relay node is selected in a distributed manner according to instantaneous relay channel conditions without prior information or extra signaling among relay candidates in the network. An additional three-way handshake is …
Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks
2005
IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…
The Content Web-Accessibility of Information and Technology Support in a Complex System of Educational and Social Inclusion
2018
Support for the socialization of people with special needs is an urgent task in the European space. The study of the system of educational and social inclusion requires an interdisciplinary approach, and a large number of components, their hierarchy, and other features states that the system of inclusion is complex, and therefore requires appropriate means of its modeling - complex networks, graphs, appropriate modeling languages, etc. An important stage in the study of complex systems is the evaluation of their information and technology component in terms of the web accessibility. The use of the recommendations outlined in the WCAG 2.0 while developing information technologies as a compon…
Higher Education for People with Disabilities – Romanian Education Experience
2014
Abstract Implementation of a project which aimed was having access to a quality higher education to prospective students with disabilities has been a successful complex situations, obstacles, fears, future projections etc. Among the obstacles that hamper their access to higher education are: high costs, almost prohibitive for universities to provide suitable means for assimilation of the curriculum for these people with disabilities, physical barriers (inability to move at the college in order to pursue these courses or to access course materials in print format standard), material and financial matters such as, lack of qualified staff for educational mentoring people with disabilities, lac…
El acceso de los hijos de inmigrantes a la Educación Superior en España ¿una cuestión de origen étnico o de origen social?
2021
El presente trabajo se enmarca dentro de los estudios sobre la Dimensión Social de la Educación Superior (DOES). En él se estudia el peso que la posición socioeconómica tiene en el acceso a la Educación Superior de las segundas generaciones en España. Para ello analizamos la probabilidad de que los estudiantes con antecedentes migratorios y diferentes orígenes socioeconómicos realizaran estudios terciarios durante la segunda década del siglo XXI en contraste con la población autóctona de nuevo ingreso. En nuestros resultados encontramos diferencias significativas en el acceso a la universidad entre los jóvenes con edades comprendidas entre los 18 y 21 años, pertenecientes a las segundas gen…
pruebas de acceso a enseñanzas superiores de música en España
2021
El profesorado del último ciclo de Enseñanzas Profesionales de Clarinete debe preparara al alumnado para superar la Prueba de Acceso a Enseñanza Superior, sin dejar por ello de cumplir con las exigencias específicas de la etapa correspondiente. Profesorado y alumnado se enfrentan a dificultades que pueden surgir por la complejidad del repertorio, por complicaciones técnicas derivadas del mismo o por cuestiones de índole psicológica ante la interpretación pública. Las opiniones al respecto de los agentes implicados son variadas y llevan, en muchos casos, a estigmatizar todavía más dichas pruebas. En este documento, se recogen las diferentes consideraciones sobre las Pruebas de Acceso por par…