Search Results for author: Marian-Andrei Rizoiu

Found 33 papers, 12 papers with code

The Innovation-to-Occupations Ontology: Linking Business Transformation Initiatives to Occupations and Skills

no code implementations27 Oct 2023 Daniela Elia, Fang Chen, Didar Zowghi, Marian-Andrei Rizoiu

The fast adoption of new technologies forces companies to continuously adapt their operations making it harder to predict workforce requirements.

Informing Innovation Management: Linking Leading R&D Firms and Emerging Technologies

no code implementations4 May 2023 Xian Gong, Claire McFarland, Paul McCarthy, Colin Griffith, Marian-Andrei Rizoiu

Understanding the relationship between emerging technology and research and development has long been of interest to companies, policy makers and researchers.

Management

The Science of Startups: The Impact of Founder Personalities on Company Success

no code implementations15 Feb 2023 Paul X. McCarthy, Xian Gong, Fabian Stephany, Fabian Braesemann, Marian-Andrei Rizoiu, Margaret L. Kern

Startup companies solve many of today's most complex and challenging scientific, technical and social problems, such as the decarbonisation of the economy, air pollution, and the development of novel life-saving vaccines.

Being Automated or Not? Risk Identification of Occupations with Graph Neural Networks

no code implementations6 Sep 2022 Dawei Xu, Haoran Yang, Marian-Andrei Rizoiu, Guandong Xu

In this paper, we study the automation risk of occupations by performing a classification task between automated and non-automated occupations.

Decision Making

Detect Hate Speech in Unseen Domains using Multi-Task Learning: A Case Study of Political Public Figures

no code implementations22 Aug 2022 Lanqin Yuan, Marian-Andrei Rizoiu

We simulate evaluation on new previously unseen datasets by adopting a leave-one-out scheme in which we omit a target dataset from training and jointly train on the other datasets.

Multi-Task Learning

Opinion Market Model: Stemming Far-Right Opinion Spread using Positive Interventions

1 code implementation13 Aug 2022 Pio Calderon, Rohit Ram, Marian-Andrei Rizoiu

To evaluate the effectiveness of positive interventions, we introduce the Opinion Market Model (OMM), a two-tier online opinion ecosystem model that considers both inter-opinion interactions and the role of positive interventions.

Linking Across Data Granularity: Fitting Multivariate Hawkes Processes to Partially Interval-Censored Data

1 code implementation3 Nov 2021 Pio Calderon, Alexander Soen, Marian-Andrei Rizoiu

The multivariate Hawkes process (MHP) is widely used for analyzing data streams that interact with each other, where events generate new events within their own dimension (via self-excitation) or across different dimensions (via cross-excitation).

Interval-censored Hawkes processes

no code implementations16 Apr 2021 Marian-Andrei Rizoiu, Alexander Soen, Shidi Li, Pio Calderon, Leanne Dong, Aditya Krishna Menon, Lexing Xie

We propose the multi-impulse exogenous function - for when the exogenous events are observed as event time - and the latent homogeneous Poisson process exogenous function - for when the exogenous events are presented as interval-censored volumes.

Point Processes

Skill-driven Recommendations for Job Transition Pathways

no code implementations23 Nov 2020 Nikolas Dawson, Mary-Anne Williams, Marian-Andrei Rizoiu

Regardless of the impetus, people are faced with the challenge of moving between jobs to find new work.

Recommendation Systems

Layoffs, Inequity and COVID-19: A Longitudinal Study of the Journalism Jobs Crisis in Australia from 2012 to 2020

no code implementations28 Aug 2020 Nik Dawson, Sacha Molitorisz, Marian-Andrei Rizoiu, Peter Fray

We then tease out more granular findings, including: that there are now more women than men journalists in Australia, but that gender inequity is worsening, with women journalists getting younger and worse-paid just as men journalists are, on average, getting older and better-paid; that, despite the crisis besetting the industry, the demand for journalism skills has increased; and that, perhaps concerningly, the skills sought by journalism job ads increasingly include social media and generalist communications.

Graph modelling approaches for motorway traffic flow prediction

no code implementations26 Jun 2020 Adriana-Simona Mihaita, Zac Papachatgis, Marian-Andrei Rizoiu

Traffic flow prediction, particularly in areas that experience highly dynamic flows such as motorways, is a major issue faced in traffic management.

Management

Traffic congestion anomaly detection and prediction using deep learning

no code implementations23 Jun 2020 Adriana-Simona Mihaita, Haowen Li, Marian-Andrei Rizoiu

Congestion prediction represents a major priority for traffic management centres around the world to ensure timely incident response handling.

Anomaly Detection Management +1

A Toolkit for Analyzing and Visualizing Online Users via Reshare Cascade Modeling

1 code implementation11 Jun 2020 Quyu Kong, Rohit Ram, Marian-Andrei Rizoiu

Modeling online discourse dynamics is a core activity in understanding the spread of information, both offline and online, and emergent online behavior.

Social and Information Networks Computers and Society

Variation across Scales: Measurement Fidelity under Twitter Data Sampling

1 code implementation21 Mar 2020 Siqi Wu, Marian-Andrei Rizoiu, Lexing Xie

This paper presents in-depth measurements on the effects of Twitter data sampling across different timescales and different subjects (entities, networks, and cascades).

Quantile Propagation for Wasserstein-Approximate Gaussian Processes

1 code implementation NeurIPS 2020 Rui Zhang, Christian J. Walder, Edwin V. Bonilla, Marian-Andrei Rizoiu, Lexing Xie

We show that QP matches quantile functions rather than moments as in EP and has the same mean update but a smaller variance update than EP, thereby alleviating EP's tendency to over-estimate posterior variances.

Bayesian Inference Gaussian Processes

Estimating Attention Flow in Online Video Networks

1 code implementation20 Aug 2019 Siqi Wu, Marian-Andrei Rizoiu, Lexing Xie

In this paper, we first construct the Vevo network -- a YouTube video network with 60, 740 music videos interconnected by the recommendation links, and we collect their associated viewing dynamics.

Navigate Recommendation Systems

Motorway Traffic Flow Prediction using Advanced Deep Learning

no code implementations15 Jul 2019 Adriana-Simona Mihaita, Haowen Li, Zongyang He, Marian-Andrei Rizoiu

Congestion prediction represents a major priority for traffic management centres around the world to ensure timely incident response handling.

Management

Transfer Learning for Hate Speech Detection in Social Media

no code implementations10 Jun 2019 Marian-Andrei Rizoiu, Tianyu Wang, Gabriela Ferraro, Hanna Suominen

This paper uses a transfer learning technique to leverage two independent datasets jointly and builds a single representation of hate speech.

Social and Information Networks Computers and Society

Variational Inference for Sparse Gaussian Process Modulated Hawkes Process

1 code implementation25 May 2019 Rui Zhang, Christian Walder, Marian-Andrei Rizoiu

We validate the efficiency of our accelerated variational inference schema and practical utility of our tighter ELBO for model selection.

Model Optimization Model Selection +1

Efficient Non-parametric Bayesian Hawkes Processes

1 code implementation8 Oct 2018 Rui Zhang, Christian Walder, Marian-Andrei Rizoiu, Lexing Xie

On two large-scale Twitter diffusion datasets, we show that our methods outperform the current state-of-the-art in goodness-of-fit and that the time complexity is linear in the size of the dataset.

Modeling Popularity in Asynchronous Social Media Streams with Recurrent Neural Networks

no code implementations6 Apr 2018 Swapnil Mishra, Marian-Andrei Rizoiu, Lexing Xie

We find that results depend on the type of content being promoted: superusers are more successful in promoting Howto and Gaming videos, whereas the cohort of regular users are more influential for Activism videos.

#DebateNight: The Role and Influence of Socialbots on Twitter During the 1st 2016 U.S. Presidential Debate

2 code implementations27 Feb 2018 Marian-Andrei Rizoiu, Timothy Graham, Rui Zhang, Yifei Zhang, Robert Ackland, Lexing Xie

We collect a large dataset of tweets during the 1st U. S. Presidential Debate in 2016 (#DebateNight) and we analyze its 1. 5 million users from three perspectives: user influence, political behavior (partisanship and engagement) and botness.

Social and Information Networks

Beyond Views: Measuring and Predicting Engagement in Online Videos

1 code implementation8 Sep 2017 Siqi Wu, Marian-Andrei Rizoiu, Lexing Xie

The share of videos in the internet traffic has been growing, therefore understanding how videos capture attention on a global scale is also of growing importance.

Social and Information Networks Human-Computer Interaction

A Tutorial on Hawkes Processes for Events in Social Media

no code implementations21 Aug 2017 Marian-Andrei Rizoiu, Young Lee, Swapnil Mishra, Lexing Xie

This chapter provides an accessible introduction for point processes, and especially Hawkes processes, for modeling discrete, inter-dependent events over continuous time.

Point Processes

Expecting to be HIP: Hawkes Intensity Processes for Social Media Popularity

1 code implementation19 Feb 2016 Marian-Andrei Rizoiu, Lexing Xie, Scott Sanner, Manuel Cebrian, Honglin Yu, Pascal Van Hentenryck

Modeling and predicting the popularity of online content is a significant problem for the practice of information dissemination, advertising, and consumption.

Social and Information Networks

How to Use Temporal-Driven Constrained Clustering to Detect Typical Evolutions

no code implementations11 Jan 2016 Marian-Andrei Rizoiu, Julien Velcin, Stéphane Lallich

In this paper, we propose a new time-aware dissimilarity measure that takes into account the temporal dimension.

Constrained Clustering

Unsupervised Feature Construction for Improving Data Representation and Semantics

no code implementations17 Dec 2015 Marian-Andrei Rizoiu, Julien Velcin, Stéphane Lallich

We seek to construct, in an unsupervised way, new features that are more appropriate for describing a given dataset and, at the same time, comprehensible for a human user.

Two-sample testing

Semantic-enriched Visual Vocabulary Construction in a Weakly Supervised Context

no code implementations14 Dec 2015 Marian-Andrei Rizoiu, Julien Velcin, Stéphane Lallich

We apply our proposition to the task of content-based image classification and we show that semantically enriching the image representation yields higher classification performances than the baseline representation.

Classification General Classification +1

CommentWatcher: An Open Source Web-based platform for analyzing discussions on web forums

2 code implementations28 Apr 2015 Marian-Andrei Rizoiu, Adrien Guille, Julien Velcin

Constructed as a web platform, CommentWatcher features automatic mass fetching of user posts from forum on multiple sites, extracting topics, visualizing the topics as an expression cloud and exploring their temporal evolution.

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