Marcelo Mendoza

ORCID: 0000-0002-7969-6041
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About
Contact & Profiles
Research Areas
  • Topic Modeling
  • Complex Network Analysis Techniques
  • Natural Language Processing Techniques
  • Misinformation and Its Impacts
  • Advanced Text Analysis Techniques
  • Web Data Mining and Analysis
  • Spam and Phishing Detection
  • Text and Document Classification Technologies
  • Recommender Systems and Techniques
  • Data Management and Algorithms
  • scientometrics and bibliometrics research
  • Opinion Dynamics and Social Influence
  • Sentiment Analysis and Opinion Mining
  • Data Mining Algorithms and Applications
  • Image Retrieval and Classification Techniques
  • Social Media and Politics
  • Advanced Image and Video Retrieval Techniques
  • Algorithms and Data Compression
  • Media Influence and Politics
  • Public Relations and Crisis Communication
  • Spectroscopy and Chemometric Analyses
  • Advanced Clustering Algorithms Research
  • Hate Speech and Cyberbullying Detection
  • Semantic Web and Ontologies
  • Caching and Content Delivery

Pontificia Universidad Católica de Chile
2022-2025

Millennium Institute for Integrative Biology
2021-2025

Agencia Nacional de Investigación y Desarrollo
2025

University of Santo Tomas
2024

Escuela Superior Politecnica del Litoral
2024

Federico Santa María Technical University
2012-2022

Universidad Técnica Federico Santa María
2016-2022

National University of the Littoral
2017

Universidad de Playa Ancha de Ciencias de la Educación
2016

Laboratoire d'Informatique de Paris-Nord
2016

We analyze the information credibility of news propagated through Twitter, a popular microblogging service. Previous research has shown that most messages posted on Twitter are truthful, but service is also used to spread misinformation and false rumors, often unintentionally.

10.1145/1963405.1963500 article EN 2011-03-28

In this article we explore the behavior of Twitter users under an emergency situation. particular, analyze activity related to 2010 earthquake in Chile and characterize hours days following disaster. Furthermore, perform a preliminary study certain social phenomenons, such as dissemination false rumors confirmed news. We how information propagated through network, with purpose assessing reliability source extreme circumstances. Our analysis shows that propagation tweets correspond differs...

10.1145/1964858.1964869 article EN 2010-07-25

Abstract Purpose Twitter is a popular microblogging service which has proven, in recent years, its potential for propagating news and information about developing events. The purpose of this paper to focus on the analysis credibility Twitter. our research establish if an automatic discovery process relevant credible events can be achieved. Design/methodology/approach follows supervised learning approach task classification A first classifier decides cascade corresponds newsworthy event. Then...

10.1108/intr-05-2012-0095 article EN Internet Research 2013-10-08

Twitter sentiment analysis or the task of automatically retrieving opinions from tweets has received an increasing interest web mining community. This is due to its importance in a wide range fields such as business and politics. People express sentiments about specific topics entities with different strengths intensities, where these are strongly related their personal feelings emotions. A number methods lexical resources have been proposed analyze natural language texts, addressing opinion...

10.1145/2502069.2502071 article EN 2013-08-01

Social media services have spread throughout the world in just a few years. They become not only new source of information, but also mechanisms for societies world-wide to organize themselves and communicate. Therefore, social has very strong impact many aspects -- at personal level, business, politics, among others. In spite its fast adoption, little is known about usage different countries, whether patterns behavior remain same or not. To provide deep understanding differences between...

10.1145/2063576.2063724 article EN 2011-10-24

The package diverse provides an easy-to-use interface to calculate and visualize different aspects of diversity in complex systems.In recent years, increasing number research projects social interdisciplinary sciences, including fields like innovation studies, scientometrics, economics, network science have emphasized the role diversification sophistication socioeconomic systems.However, so far no dedicated exists that covers needs these emerging teams.Most packages about tend be created...

10.32614/rj-2016-033 article EN cc-by The R Journal 2016-01-01

Software assistants have significantly impacted software development for both practitioners and students, particularly in capstone projects. The effectiveness of these tools varies based on their knowledge sources; with localized, domain-specific may limitations, while like ChatGPT, using broad datasets, might offer recommendations that do not always match the specific objectives a course. Addressing gap current educational technology, this paper introduces an AI Knowledge Assistant...

10.1109/tlt.2024.3396735 article EN IEEE Transactions on Learning Technologies 2024-01-01

Web usage mining is a main research area in focused on learning about users and their interactions with sites. Main challenges are the application of data techniques to an efficient way discovery non trivial user behaviour patterns. In this paper we focus attention search engines analyzing query log showing several models how use engine results.

10.1109/laweb.2005.23 article EN 2006-03-10

The Modified Mercalli intensity scale (Mercalli for short) is a qualitative measure used to express the perceived of an earthquake in terms damages. Accurate reports are vital estimate type emergency response required particular earthquake. In addition, needed possible consequences strong earthquakes future, based on effects previous events. Emergency offices and seismological agencies worldwide charge producing each affected location after However, this task relies heavily human observers...

10.1140/epjds/s13688-019-0181-0 article EN cc-by EPJ Data Science 2019-01-31

Abstract The rise of bots that mimic human behavior represents one the most pressing threats to healthy information environments on social media. Many are designed increase visibility low-quality content, spread misinformation, and artificially boost reach brands politicians. These can also disrupt civic action coordination, such as by flooding a hashtag with spam undermining political mobilization. Social media platforms have recognized these malicious bots’ risks implemented strict...

10.1038/s41598-024-57227-3 article EN cc-by Scientific Reports 2024-03-19

10.1007/s13278-019-0602-x article EN Social Network Analysis and Mining 2019-09-27

The rise of bots and their influence on social networks is a hot topic that has aroused the interest many researchers. Despite efforts to detect bots, it still difficult distinguish them from legitimate users. Here, we propose simple yet effective semi-supervised method allows distinguishing between users with high accuracy. learns joint representation connections interactions by leveraging graph-based learning. Then, proximity graph derived user embeddings, sample used as seeds for label...

10.1145/3419369 article EN ACM transactions on office information systems 2020-10-17

The variety of goods obtained from root crops, particularly cassava and sweet potatoes, is getting low, thereby affecting their sustainability. researcher has produced a syrup by combining potato starch. This study evaluated the sensory acceptability, proximate characteristics, production cost blend with amylase. procedure involves boiling starch purified water for 30 minutes; thereafter, amylase enzyme incorporated into slurry. stirred combined slurry, converting it liquid, then simmered...

10.69651/pijhss040250 article EN Pantao, international journal of the humanities and social sciences 2025-01-01

This study analyzes the discourse of reporters, editors and audiences in focus groups in-depth interviews, examining expectations on journalists when facing misinformation. While both agree that journalistic information is critical, how this expectation met varies. On one hand, audience's way knowing involves diverse assessments regarding valuable information; also, they are dubious about journalists' intentions. other exhibit a limited understanding informational needs encounter practical...

10.1080/21670811.2024.2320249 article EN cc-by-nc-nd Digital Journalism 2024-02-28

Abstract Background Large language models (LLMs) like GPT-4o have shown promise in advancing medical decision-making and education. However, their performance Spanish-language contexts remains underexplored. This study evaluates the effectiveness of single-agent multi-agent strategies answering questions from EUNACOM, a standardized licensure exam Chile, across 21 specialties. Methods was tested on 1,062 multiple-choice publicly available EUNACOM preparation materials. Single-agent included...

10.1186/s12909-025-07250-3 article EN cc-by BMC Medical Education 2025-05-07

10.1016/j.eswa.2016.06.008 article EN Expert Systems with Applications 2016-06-18

10.1007/s10844-019-00548-x article EN Journal of Intelligent Information Systems 2019-03-09
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