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 Virgílio A F Almeida

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Average citations per article16.05
Citation Count1,653
Publication count103
Publication years1986-2019
Available for download57
Average downloads per article758.12
Downloads (cumulative)43,213
Downloads (12 Months)1,952
Downloads (6 Weeks)258
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95 results found Export Results: bibtexendnoteacmrefcsv

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1 published by ACM
May 2019 WWW '19: Companion Proceedings of The 2019 World Wide Web Conference
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 31,   Downloads (12 Months): 31,   Downloads (Overall): 31

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Voice-based assistants are becoming increasingly widespread all over the world. However, the performance of these assistants in the interaction with users of languages and accents of developing countries is not clear yet. Eventual bias against specific language or accent of different groups of people in developing countries is maybe a ...
Keywords: bias, machine learning., voice-based personal assistants

2 published by ACM
May 2018 WebSci '18: Proceedings of the 10th ACM Conference on Web Science
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 11,   Downloads (12 Months): 323,   Downloads (Overall): 330

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As of 2018, YouTube, the major online video sharing website, hosts multiple channels promoting right-wing content. In this paper, we observe issues related to hate, violence and discriminatory bias in a dataset containing more than 7,000 videos and 17 million comments. We investigate similarities and differences between users' comments and ...
Keywords: comments, discriminatory bias, hate speech, youtube

3
March 2017 IEEE Internet Computing: Volume 21 Issue 2, March 2017
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 1

Dyn suffered multiple complex DDoS attacks in October 2016, constituting one of the largest cyberattacks of this nature ever documented. With this and other recent events in mind, the authors discuss conceptual and practical challenges around cyberwarfare and its impact on cyberspace governance.

4
November 2016 IEEE Internet Computing: Volume 20 Issue 6, November 2016
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 0

App stores challenge the culture of openness and resistance to central authorities cultivated by the pioneers of the Internet. Could multistakeholder governance bodies bring more inclusivity into the global cyberspace governance ecosystem?

5
March 2016 IEEE Internet Computing: Volume 20 Issue 2, March 2016
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 0

Due to their enormous popularity, social network platforms such as Facebook, YouTube, and Twitter are constantly viewed as stand-ins for public spaces. Although they have their own rules, there are ethical aspects that demand governance to guarantee their compliance with human rights. This article seeks to explore the essentials that ...

6 published by ACM
June 2014 WebSci '14: Proceedings of the 2014 ACM conference on Web science
Publisher: ACM
Bibliometrics:
Citation Count: 5
Downloads (6 Weeks): 2,   Downloads (12 Months): 27,   Downloads (Overall): 254

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Little is known on how visual content affects the popularity on social networks, despite images being now ubiquitous on the Web, and currently accounting for a considerable fraction of all content shared. Existing art on image sharing focuses mainly on non-visual attributes. In this work we take a complementary approach, ...
Keywords: image popularity, information diffusion, popularity prediction

7 published by ACM
October 2012 ACM Transactions on Knowledge Discovery from Data (TKDD): Volume 6 Issue 3, October 2012
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 10,   Downloads (12 Months): 134,   Downloads (Overall): 977

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The multi-million sports-betting market is based on the fact that the task of predicting the outcome of a sports event is very hard. Even with the aid of an uncountable number of descriptive statistics and background information, only a few can correctly guess the outcome of a game or a ...
Keywords: sports analytics, Complex networks, social networks

8
July 2012 Information Sciences—Informatics and Computer Science, Intelligent Systems, Applications: An International Journal: Volume 195, July, 2012
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 23

Understanding how users navigate and interact when they connect to social networking sites creates opportunities for better interface design, richer studies of social interactions, and improved design of content distribution systems. In this paper, we present an in-depth analysis of user workloads in online social networks. This study is based ...
Keywords: Browsing, Clickstream, Session, Social network aggregator, User behavior, Online social networks

9 published by ACM
June 2012 HT '12: Proceedings of the 23rd ACM conference on Hypertext and social media
Publisher: ACM
Bibliometrics:
Citation Count: 5
Downloads (6 Weeks): 4,   Downloads (12 Months): 43,   Downloads (Overall): 392

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In information networks where users send messages to one another, the issue of information overload naturally arises: which are the most important messages? In this paper we study the problem of understanding the importance of messages in Twitter. We approach this problem in two stages. First, we perform an extensive ...
Keywords: social networks, timeline, twitter

10 published by ACM
April 2012 PSOSM '12: Proceedings of the 1st Workshop on Privacy and Security in Online Social Media
Publisher: ACM
Bibliometrics:
Citation Count: 9
Downloads (6 Weeks): 4,   Downloads (12 Months): 51,   Downloads (Overall): 1,035

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Social-networking users unknowingly reveal certain kinds of personal information that malicious attackers could profit from to perpetrate significant privacy breaches. This paper quantitatively demonstrates how the simple act of tagging pictures on the social-networking site of Facebook could reveal private user attributes that are extremely sensitive. Our results suggest that ...
Keywords: online social networks, photo tags, privacy

11
March 2012 IEEE Internet Computing: Volume 16 Issue 2, March 2012
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 0

Modern technology's benefits have accelerated our migration to social networking and other online activities. However, the confluence of the online world and life offline is imperfect, immature, and incomplete. People's habits, customs, and relationships are going through profound changes that will have as-yet-unknown effects on them and society as a ...
Keywords: privacy, online world, communication, multidisciplinarity, Internet

12 published by ACM
February 2012 WSDM '12: Proceedings of the fifth ACM international conference on Web search and data mining
Publisher: ACM
Bibliometrics:
Citation Count: 23
Downloads (6 Weeks): 1,   Downloads (12 Months): 15,   Downloads (Overall): 773

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Online Location Based Social Networks (LBSNs), which combine social network features with geographic information sharing, are becoming increasingly popular. One such application is Foursquare, which doubled its user population in less than six months. Among other features, Foursquare allows users to leave tips (i.e., reviews or recommendations) at specific venues ...
Keywords: location based social networks, spamming, user behavior characterization

13 published by ACM
November 2011 IMC '11: Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference
Publisher: ACM
Bibliometrics:
Citation Count: 43
Downloads (6 Weeks): 0,   Downloads (12 Months): 8,   Downloads (Overall): 561

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Traditionally, users have discovered information on the Web by browsing or searching. Recently, word-of-mouth has emerged as a popular way of discovering the Web, particularly on social networking sites like Facebook and Twitter. On these sites, users discover Web content by following URLs posted by their friends. Such word-of-mouth based ...
Keywords: information diffusion, social networks, web content discovery, word-of-mouth

14
September 2011 INTERACT'11: Proceedings of the 13th IFIP TC 13 international conference on Human-computer interaction - Volume Part III
Publisher: Springer-Verlag
Bibliometrics:
Citation Count: 2

This paper presents a characterization of interaction phenomena among members of communities aimed at deaf people in an online social network system, namely Orkut. The results revealed that members of deaf communities are tighter than members of other communities. However, analysis of the interface indicates that it does not always ...
Keywords: accessibility, online communities, orkut, deaf, social networks

15 published by ACM
August 2011 KDD '11: Proceedings of the 17th ACM SIGKDD international conference on Knowledge discovery and data mining
Publisher: ACM
Bibliometrics:
Citation Count: 23
Downloads (6 Weeks): 11,   Downloads (12 Months): 108,   Downloads (Overall): 1,461

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Real-time interaction, which enables live discussions, has become a key feature of most Web applications. In such an environment, the ability to automatically analyze user opinions and sentiments as discussions develop is a powerful resource known as real time sentiment analysis. However, this task comes with several challenges, including the ...
Keywords: opinion mining, transfer learning, sentiment analysis, relational learning, social media

16 published by ACM
July 2011 GECCO '11: Proceedings of the 13th annual conference companion on Genetic and evolutionary computation
Publisher: ACM
Bibliometrics:
Citation Count: 3
Downloads (6 Weeks): 0,   Downloads (12 Months): 3,   Downloads (Overall): 140

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Sparse wireless sensor networks are characterized by the distances the sensors are from each other. In this type of network, gathering data from all sensors in a point of interest might be a difficult task, and in many cases a mobile robot is used to travel along the sensors and ...
Keywords: ant colony optimization, global optimization, wireless sensor networks

17
June 2011 LSM '11: Proceedings of the Workshop on Languages in Social Media
Publisher: Association for Computational Linguistics
Bibliometrics:
Citation Count: 18
Downloads (6 Weeks): 48,   Downloads (12 Months): 326,   Downloads (Overall): 2,375

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Hashtags are used in Twitter to classify messages, propagate ideas and also to promote specific topics and people. In this paper, we present a linguistic-inspired study of how these tags are created, used and disseminated by the members of information networks. We study the propagation of hashtags in Twitter grounded ...

18
March 2011 IEEE Internet Computing: Volume 15 Issue 2, March 2011
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 0

Workload measurement, characterization, and modeling are key steps toward the design, planning, and management of both new and maturing Internet applications and services.However, the emergence of several new applications (such as online social networking) and the explosive growth in popularity of others (such as e-business, online auction, and streaming), most ...
Keywords: Internet workloads, system design and management, Internet workloads, characterization and modeling, measurement, system design and management, characterization and modeling, measurement

19
May 2010 IEEE Internet Computing: Volume 14 Issue 3, May 2010
Publisher: IEEE Educational Activities Department
Bibliometrics:
Citation Count: 6

The blogosphere's more outgoing and informal social nature provides an opportunity to exploit more socially oriented features, such as credibility and popularity, for searching, recommendation, and other tasks. In this article, the authors present evidence that blog popularity in particular has been underexploited by current search engines, including specialized ones, ...
Keywords: blog popularity, search, blogs, blog popularity, social networks, search, blogs, social networks

20
April 2010 Journal of Parallel and Distributed Computing: Volume 70 Issue 4, April, 2010
Publisher: Academic Press, Inc.
Bibliometrics:
Citation Count: 19

In service oriented architectures, Quality of Service (QoS) is a key issue. Service requestors evaluate QoS at run time to address their service invocation to the most suitable provider. Thus, QoS has a direct impact on the providers' revenues. However, QoS requirements are difficult to satisfy because of the high ...
Keywords: Admission control, Resource allocation, Optimization, Quality of service



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