Search results for "199"
showing 10 items of 503 documents
Impacto del viaje de Freire a Valencia
2021
In the publications of Freire's trip, errors are detected that makes invisible both its impact and those who made it possible. An analysis of the documentation, 6 interviews with people who made the trip possible, 6 with professionals and 2 with family members in Valencia who are transforming their schools and 2 dialogical observations have been carried out. The results make it clear: 1) Those who proposed this trip both to Freire and to the Regional Ministry are Flecha and Jesús Gomez 'Pato'. 2) The reason is the approval by the Valencian Parliament of the Law on Adult Education, whose 'Report and draft for its preliminary project' had been entrusted to Flecha, who was hired to elaborate i…
Do Current Domestic Gigabit Wireless Technologies Fulfill User Requirements for Ultra High Definition Videos?
2017
We present the results from a measurement-based performance evaluation of wireless networks based on IEEE 802.11n and IEEE 802.11ac standards in an indoor environment, with the aim to analyze their performance under high definition streaming video applications. We focus our study on analyzing the highest performance of these standards using off-the-shelf equipment, both with synthetic TCP and UDP traffic to measure the saturation throughput as well as high definition video streams. The measurements have been conducted in the student labs of our university and show good performance for streaming purposes in high definition and also ultra-high definition from a subjective video quality point …
Assessing the effectiveness of IEEE 802.11e in multi-hop mobile network environments
2004
The IEEE 802.11e technology is receiving much interest due to the promising enhancements it offers to wireless local area networks in terms of QoS support. Until now, research has focused on single hop, access point based environments, which are the most common. We review the enhancements proposed in the last IEEE 802.11e draft (version 8.0). We analyze the performance of the IEEE 802.11e protocol on ad-hoc networks (multi-hop) in terms of throughput and end-to-end delay. We also measure the effectiveness for static and fully dynamic networks with a variable number of source stations. Finally, we analyze the performance of IEEE 802.11e when legacy IEEE 802.11 stations (no IEEE 802.11e suppo…
Crisis of Privacy and Sacrifice of Personal Data in the Name of National Security: The CJEU Rulings Strengthening EU Data Protection Standards
2017
Snowden’s surveillance revelations in 2013 raised the issue of privacy and security in the public spotlight. These revelations underlined the need for strong data protection framework. At the same time, the pressing demand to address security concerns and the threat of terrorist attacks might weaken privacy and data protection standards. Two landmark judgments of the Court of Justice of the European Union (the CJEU), namely, the Digital rights Ireland judgment which invalidates Data Retention Directive, and the Schrems judgment which invalidates Safe Harbour Decision forming a legal basis for transatlantic data transfers are of great significance in strengthening the rights to privacy and d…
Performance Study of Non-beaconed and Beacon-Enabled Modes in IEEE 802.15.4 under Bluetooth Interference
2008
The IEEE 802.15.4 protocol is a flexible technology with great potential for wireless sensor networks applications. The standard distinguishes two network modes; beacon-enabled and nonbeacon-enabled. In this paper, the performance study of beaconed and non-beaconed modes of IEEE 802.15.4 is evaluated using on site PER measurements. The tests are carryout in an urban outdoor environment with commercial available equipment. Likewise, the impact of Bluetooth interference over IEEE 802.15.4 modes is evaluated. The results show that Bluetooth interference and the mode selected have effects over the PER. Furthermore, for distances between 3 to 10 meters the PER doesn't show significance distance …
The first cyber summit - Clinton-Yeltsin Helsinki Summit 1997 : providing content for short time news events using Internet technologies
1997
Post-fotografia etnografica
2021
È evidente come la nostra società tecnologica sia legata senza alcun dubbio alla diffusione delle immagini. Autori come Gottfried Boehm, John Mitchell, Hans Belting hanno indagato la natura dell'immagine ponendo le basi, negli anni Novanta, per l'idea di un pictorial turn, di una cultura totalmente dominata dalle immagini che è diventata adesso una possibilità tecnica reale su scala globale. Un nuovo statuto dell'immagine che si usa raccogliere sotto l'etichetta di iconic turner inserito nel più vasto campo visual culture studies. L'uso del termine cultura accanto a quello di visuale è indicativo dell'ampiezza del campo d'indagine che visual culture studies si prefiggono di ricercare: essi …
The effect of education on migration: evidence from school reform
2010
A polytechnic, higher education reform took place in Finland in the 1990s. It gradually transformed former vocational colleges into polytechnics and expanded higher education to all Finnish regions. We implement instrumental variables estimators that exploit the exogenous variation in the regional availability of polytechnic education together with matriculation exam scores. Our IV results show that polytechnic graduates have a higher migration probability than those of vocational college graduates. However, a master’s degree did not increase migration propensity in comparison with a polytechnic degree. We also find that an increase in the availability of polytechnic education did not reduc…