Media, Aggregators, and the Link Economy: Strategic Hyperlink Formation in Content Networks

A defining property of the World Wide Web is a content site's ability to place virtually costless hyperlinks to third-party content as a substitute or complement to its own content. Costless hyperlinking has enabled new types of players, usually referred to as content aggregators, to successfully enter content ecosystems, attracting traffic and revenue by hosting links to the content of others. This, in turn, has sparked a heated controversy between content creators and aggregators regarding the legitimacy and costs/benefits of uninhibited free linking. To our knowledge, this work is the first to model the complex interplay between content and links in settings where a set of sites compete for traffic. We develop a series of analytical models that distill how hyperlinking affects the (a) incentives of content nodes to produce quality content versus link to third-party content, (b) profits of the various stakeholders, (c) average quality of content that becomes available to consumers, and (d) impact of content aggregators. Our results provide a nuanced view of the so-called link economy, highlighting both the beneficial consequences and the drawbacks of free hyperlinks for content creators and consumers.This paper was accepted by Lorin Hitt, information systems

Data Aggregation and Packet Bundling of Uplink Small Packets for Monitoring Applications in LTE

In cellular massive Machine-Type Communications (MTC), a device can transmit directly to the base station (BS) or through an aggregator (intermediate node). While direct device-BS communication has recently been in the focus of 5G/3GPP research and standardization efforts, the use of aggregators remains a less explored topic. In this paper we analyze the deployment scenarios in which aggregators can perform cellular access on behalf of multiple MTC devices. We study the effect of packet bundling at the aggregator, which alleviates overhead and resource waste when sending small packets. The aggregators give rise to a tradeoff between access congestion and resource starvation and we show that packet bundling can minimize resource starvation, especially for smaller numbers of aggregators. Under the limitations of the considered model, we investigate the optimal settings of the network parameters, in terms of number of aggregators and packet-bundle size. Our results show that, in general, data aggregation can benefit the uplink massive MTC in LTE, by reducing the signalling overhead.Comment: to appear in IEEE Networ

The Current Status of Social Risks on Educational Systems. An Analysis Through Social Media

Este trabajo ha sido publicado en las actas del citado congreso, y revisados los documentos donde ha sido publicado, no se muestran impedimentos legales para que pueda ser publicado el documento.Social Risk in education such as bullying, are usually invisible to teachers and parents, at all educational levels. However, these risks remain a reality everywhere in the world, turning into a problem that is rapidly globalizing due to the widespread access to the Internet. The Internet has permeated our entire society and is now present in almost every activity. The education and most aspects associated with it, such as Social Risks, are not exempt of this new form of communication within our society. This has led to a significant increase in damage Social Risks can exhort on the victims, due to several causes such as their capacity for dissemination, repetition and virality; greater anonymity of aggressors and the chance for more people joining them; continuity over time even when after school hours; display of intimacy before an endless crowd of people; ease of permanent control through geolocation, control of online statuses and connections; and even the risk of easily impersonating a victim. The first step to prevent these issues is to carry out a study on the current state of Social Risks. An updated snapshot would allow to draw up action plans based on reliable data and develop countermeasures to minimize the damage caused by current Social Risks to minors. The objective of this work is to conduct a study on unsolicited data obtained from Social Media on three of the most prominent Social Risks of our society, namely Bullying, Addictions and Xenophobia within the field of education, with the aim of obtaining an updated snapshot of their current status. The study was carried out during the second semester of 2017 and the first semester of 2018, quantifying the presence and emotion of said risks in Social Media, determining the most relevant terms, as well as the most used communication channels