Search Results for author: Kevin S. Xu

Found 17 papers, 4 papers with code

A Latent Space Model for HLA Compatibility Networks in Kidney Transplantation

no code implementations4 Nov 2022 Zhipeng Huang, Kevin S. Xu

We propose to model HLA compatibility using a network, where the nodes denote different HLAs of the donor and recipient, and edge weights denote compatibilities of the HLAs, which can be positive or negative.

Survival Analysis

A Mutually Exciting Latent Space Hawkes Process Model for Continuous-time Networks

1 code implementation19 May 2022 Zhipeng Huang, Hadeel Soliman, Subhadeep Paul, Kevin S. Xu

Networks and temporal point processes serve as fundamental building blocks for modeling complex dynamic relational data in various domains.

Point Processes

Learning User Embeddings from Temporal Social Media Data: A Survey

no code implementations17 May 2021 Fatema Hasan, Kevin S. Xu, James R. Foulds, SHimei Pan

User-generated data on social media contain rich information about who we are, what we like and how we make decisions.

Representation Learning

CHIP: A Hawkes Process Model for Continuous-time Networks with Scalable and Consistent Estimation

1 code implementation NeurIPS 2020 Makan Arastuie, Subhadeep Paul, Kevin S. Xu

In many application settings involving networks, such as messages between users of an on-line social network or transactions between traders in financial markets, the observed data consist of timestamped relational events, which form a continuous-time network.

Clustering Community Detection

Unsupervised Motion Artifact Detection in Wrist-Measured Electrodermal Activity Data

1 code implementation26 Jul 2017 Yuning Zhang, Maysam Haghdan, Kevin S. Xu

In this paper, we demonstrate that unsupervised learning algorithms perform competitively with supervised algorithms for detecting MAs on EDA data collected in both a lab-based setting and a real-world setting comprising about 23 hours of data.

Artifact Detection Small Data Image Classification

Block CUR: Decomposing Matrices using Groups of Columns

no code implementations17 Mar 2017 Urvashi Oswal, Swayambhoo Jain, Kevin S. Xu, Brian Eriksson

In this paper, we consider matrix approximation by sampling predefined \emph{blocks} of columns (or rows) from the matrix.

Distributed Computing

A Compressed Sensing Based Decomposition of Electrodermal Activity Signals

no code implementations24 Feb 2016 Swayambhoo Jain, Urvashi Oswal, Kevin S. Xu, Brian Eriksson, Jarvis Haupt

The measurement and analysis of Electrodermal Activity (EDA) offers applications in diverse areas ranging from market research, to seizure detection, to human stress analysis.

Seizure Detection

Multi-criteria Similarity-based Anomaly Detection using Pareto Depth Analysis

no code implementations20 Aug 2015 Ko-Jen Hsiao, Kevin S. Xu, Jeff Calder, Alfred O. Hero III

If the relative importance of the different dissimilarity measures are not known in advance, as in many anomaly detection applications, the anomaly detection algorithm may need to be executed multiple times with different choices of weights in the linear combination.

Anomaly Detection

Stochastic Block Transition Models for Dynamic Networks

no code implementations19 Nov 2014 Kevin S. Xu

There has been great interest in recent years on statistical models for dynamic networks.

Stochastic Block Model

Consistent estimation of dynamic and multi-layer block models

no code implementations31 Oct 2014 Qiuyi Han, Kevin S. Xu, Edoardo M. Airoldi

Significant progress has been made recently on theoretical analysis of estimators for the stochastic block model (SBM).

Methodology Social and Information Networks Statistics Theory Physics and Society Statistics Theory

Dynamic stochastic blockmodels for time-evolving social networks

no code implementations4 Mar 2014 Kevin S. Xu, Alfred O. Hero III

There has been recent interest in statistical modeling of dynamic networks, which are observed at multiple points in time and offer a richer representation of many complex phenomena.

Revealing social networks of spammers through spectral clustering

no code implementations30 Apr 2013 Kevin S. Xu, Mark Kliger, Yilun Chen, Peter J. Woolf, Alfred O. Hero III

To date, most studies on spam have focused only on the spamming phase of the spam cycle and have ignored the harvesting phase, which consists of the mass acquisition of email addresses.

Clustering

Dynamic stochastic blockmodels: Statistical models for time-evolving networks

no code implementations22 Apr 2013 Kevin S. Xu, Alfred O. Hero III

Significant efforts have gone into the development of statistical models for analyzing data in the form of networks, such as social networks.

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