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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<!--====== Title ======-->
<title>HyGraph - A project combining temporal graphs with time series and graph streams</title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--====== Favicon Icon ======-->
<link rel="shortcut icon" href="assets/images/favicon.png" type="image/png">
<!--====== Magnific Popup CSS ======-->
<link rel="stylesheet" href="assets/css/magnific-popup.css">
<!--====== Slick CSS ======-->
<link rel="stylesheet" href="assets/css/slick.css">
<!--====== Line Icons CSS ======-->
<link rel="stylesheet" href="assets/css/LineIcons.css">
<!--====== Bootstrap CSS ======-->
<link rel="stylesheet" href="assets/css/bootstrap.min.css">
<!--====== Default CSS ======-->
<link rel="stylesheet" href="assets/css/default.css">
<!--====== Style CSS ======-->
<link rel="stylesheet" href="assets/css/style.css">
<!--====== Custom CSS ======-->
<link rel="stylesheet" href="assets/css/custom.css">
</head>
<body>
<!--[if IE]>
<p class="browserupgrade">You are using an <strong>outdated</strong> browser. Please <a href="https://browsehappy.com/">upgrade
your browser</a> to improve your experience and security.</p>
<![endif]-->
<!--====== PRELOADER PART START ======-->
<div class="preloader">
<div class="loader">
<div class="ytp-spinner">
<div class="ytp-spinner-container">
<div class="ytp-spinner-rotator">
<div class="ytp-spinner-left">
<div class="ytp-spinner-circle"></div>
</div>
<div class="ytp-spinner-right">
<div class="ytp-spinner-circle"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<!--====== PRELOADER PART ENDS ======-->
<!--====== NAVBAR TWO PART START ======-->
<section class="navbar-area">
<div class="container">
<div class="row">
<div class="col-lg-12">
<nav class="navbar navbar-expand-lg">
<a class="navbar-brand" href="#">
<img src="assets/images/logoHy.svg" alt="Logo">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTwo"
aria-controls="navbarTwo" aria-expanded="false" aria-label="Toggle navigation">
<span class="toggler-icon"></span>
<span class="toggler-icon"></span>
<span class="toggler-icon"></span>
</button>
<div class="collapse navbar-collapse sub-menu-bar" id="navbarTwo">
<ul class="navbar-nav m-auto">
<li class="nav-item active"><a class="page-scroll" href="#home">home</a></li>
<li class="nav-item"><a class="page-scroll" href="#services">HyGraph Research Project</a></li>
<li class="nav-item"><a class="page-scroll" href="#team">Team</a></li>
<li class="nav-item"><a class="page-scroll" href="#news">News</a></li>
</ul>
</div>
<div class="navbar-btn d-none d-sm-inline-block">
<ul>
<li><SCRIPT
LANGUAGE="JavaScript">user = 'hygraph';
site = 'uni-leipzig.de';
document.write('<a class="solid page-scroll" href=\"mailto:' + user + '@' +
site + '\">');
document.write('Contact Us</a>');</SCRIPT>
</li>
</ul>
</div>
</nav> <!-- navbar -->
</div>
</div> <!-- row -->
</div> <!-- container -->
</section>
<!--====== NAVBAR TWO PART ENDS ======-->
<!--====== SLIDER PART START ======-->
<section id="home" class="slider_area">
<div id="carouselThree" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselThree" data-slide-to="0" class="active"></li>
<li data-target="#carouselThree" data-slide-to="1"></li>
<li data-target="#carouselThree" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<div class="container">
<div class="row">
<div class="col-lg-6">
<div class="slider-content">
<h1 class="title">Graphs or <br> Time-series?</h1>
<p class="text">Both, please! HyGraph, a research project funded by ANR and DFG, combines a dynamic property graph model with
time-series and graph streams.</p>
<ul class="slider-btn rounded-buttons">
<li><a class="main-btn rounded-one page-scroll" href="#services">Read More</a></li>
<li><a class="main-btn rounded-two page-scroll" href="#team">Contact us</a></li>
</ul>
</div>
</div>
</div> <!-- row -->
</div> <!-- container -->
<div class="slider-image-box d-none d-lg-flex align-items-end">
<div class="slider-image">
<img src="assets/images/slider/1.png" alt="Hero">
</div> <!-- slider-imgae -->
</div> <!-- slider-imgae box -->
</div> <!-- carousel-item -->
<div class="carousel-item">
<div class="container">
<div class="row">
<div class="col-lg-6">
<div class="slider-content">
<h1 class="title">Graphs are everywhere.</h1>
<p class="text">Right, and so are time-series. Therefore we bring both worlds together
with HyGraph.</p>
<ul class="slider-btn rounded-buttons">
<li><a class="main-btn rounded-one page-scroll" href="#services">Read More</a></li>
<li><a class="main-btn rounded-two page-scroll" href="#team">Contact Us</a></li>
</ul>
</div> <!-- slider-content -->
</div>
</div> <!-- row -->
</div> <!-- container -->
<div class="slider-image-box d-none d-lg-flex align-items-end">
<div class="slider-image">
<img src="assets/images/slider/2.png" alt="Hero">
</div> <!-- slider-imgae -->
</div> <!-- slider-imgae box -->
</div> <!-- carousel-item -->
<div class="carousel-item">
<div class="container">
<div class="row">
<div class="col-lg-6">
<div class="slider-content">
<h1 class="title">Streams of connected data.</h1>
<p class="text">A graph stream is a continuous stream of connected data and is an ideal
input for HyGraph.</p>
<ul class="slider-btn rounded-buttons">
<li><a class="main-btn rounded-one page-scroll" href="#services">Read More</a></li>
<li><a class="main-btn rounded-two page-scroll" href="#team">Contact Us</a></li>
</ul>
</div> <!-- slider-content -->
</div>
</div> <!-- row -->
</div> <!-- container -->
<div class="slider-image-box d-none d-lg-flex align-items-end">
<div class="slider-image">
<img src="assets/images/slider/3.png" alt="Hero">
</div> <!-- slider-imgae -->
</div> <!-- slider-imgae box -->
</div> <!-- carousel-item -->
</div>
<a class="carousel-control-prev" href="#carouselThree" role="button" data-slide="prev">
<i class="lni lni-arrow-left"></i>
</a>
<a class="carousel-control-next" href="#carouselThree" role="button" data-slide="next">
<i class="lni lni-arrow-right"></i>
</a>
</div>
</section>
<!--====== SLIDER PART ENDS ======-->
<!--====== FEATRES TWO PART START ======-->
<section id="services" class="features-area">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-9 col-md-10">
<div class="section-title text-center pb-10">
<h3 class="title">The HyGraph Research Project</h3>
<p class="text"> Graphs are simple yet highly expressive data structures for modeling and analyzing
relationships
between real-world objects. As the structure and content of graphs is continuously changing,
e.g.
in social networks or transport and mobility networks, novel data models and analysis mechanisms
are needed. Our goal is to develop HyGraph, a
new hybrid data model that seamlessly combines temporal graphs with time-series and enables
high-frequency updates through graph streams. This combination in a unified hybrid model paves
the way to novel unprecedented query, analysis, data mining and machine learning tasks.</p>
</div>
</div>
</div> <!-- row -->
<div class="row justify-content-center">
<div class="col-lg-3 col-md-5 col-sm-9">
<div class="single-features mt-40">
<div class="features-title-icon d-flex justify-content-between">
<h4 class="features-title">Hybrid Data Model</h4>
<div class="features-icon">
<i class="lni lni-brush"></i>
<img class="shape" src="assets/images/f-shape-1.svg" alt="Shape">
</div>
</div>
<div class="features-content">
<p class="text">
The HyGraph model combines temporal graphs and time series with real-time
graph streams into a single abstraction. </p>
<a class="features-btn page-scroll" href="#hybridDataModel">LEARN MORE</a>
</div>
</div> <!-- single features -->
</div>
<div class="col-lg-3 col-md-7 col-sm-9">
<div class="single-features mt-40">
<div class="features-title-icon d-flex justify-content-between">
<h4 class="features-title">Query Operators</a></h4>
<div class="features-icon">
<i class="lni lni-layout"></i>
<img class="shape" src="assets/images/f-shape-1.svg" alt="Shape">
</div>
</div>
<div class="features-content">
<p class="text">Hybrid operators will be developed to utilize the new data model and
all
substructures, allowing a wide range of options for combining OLTP and
OLAP approaches to create new types of analytics.</p>
<a class="features-btn page-scroll" href="#queryOperators">LEARN MORE</a>
</div>
</div> <!-- single features -->
</div>
<div class="col-lg-3 col-md-7 col-sm-9">
<div class="single-features mt-40">
<div class="features-title-icon d-flex justify-content-between">
<h4 class="features-title">Intelligent Analytics</a></h4>
<div class="features-icon">
<i class="lni lni-bolt"></i>
<img class="shape" src="assets/images/f-shape-1.svg" alt="Shape">
</div>
</div>
<div class="features-content">
<p class="text">With HyGraph we will develop new types of analytics and data mining
operators that benefit from the model combination.
It further offers new ways of predictions through AI-based models.</p>
<a class="features-btn page-scroll" href="#intelligentAnalytics">LEARN MORE</a>
</div>
</div> <!-- single features -->
</div>
<div class="col-lg-3 col-md-7 col-sm-9">
<div class="single-features mt-40">
<div class="features-title-icon d-flex justify-content-between">
<h4 class="features-title">Development and Application</a></h4>
<div class="features-icon">
<i class="lni lni-bolt"></i>
<img class="shape" src="assets/images/f-shape-1.svg" alt="Shape">
</div>
</div>
<div class="features-content">
<p class="text">The new data model, operators and analysis approaches will
prototypically be implemented, evaluated and applied to use
cases from the micro-mobility and IT security domain.</p>
<a class="features-btn page-scroll" href="#Development and Application">LEARN MORE</a>
</div>
</div>
</div>
</div> <!-- row -->
</div> <!-- container -->
</section>
<!--====== FEATRES TWO PART ENDS ======-->
<!--====== PORTFOLIO PART START ======-->
<section id="hybridDataModel" class="portfolio-area portfolio-four pb-100">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-9 col-md-10">
<div class="section-title text-center pb-10">
<h3 class="title">Hybrid Data Model</h3>
<p class="text">The HyGraph model combines temporal graphs and time series into a single
abstraction. Real-time graph streams are used to continuously update the hybrid graph. The model
includes data representation, maintenance operations, updatability, and retrieval and querying
of substructures while ensuring consistency with inference or integrity rules.
</p>
<p class="text">
One of our tasks is to design a flexible data model
that can handle dynamic relationships and time-series data.
Two potential designs have already been
proposed, and suitable types and properties need to be defined to encode
evolving input data.
We will support maintaining and updating the hybrid graph data model as new data
arrives,
and the focus is on developing maintenance algorithms for update, insert, and delete operations.
The plan is to use the properties of the hybrid graph to group maintenance operations as bulk
operations and to enforce consistency using mechanisms similar to key constraints for property
graphs.
</p>
</div>
<img src="assets/images/ModelCombination_v2.svg" alt="Model Combination" class="box-image">
</div>
</div>
</div>
</section>
<section id="queryOperators" class="pricing-area portfolio-four pb-100">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-9 col-md-10">
<div class="section-title text-center pb-10">
<h3 class="title">Query Operators</h3>
<p class="text">Operators will be developed to utilize the new data model and all substructures,
allowing a wide range of options for combining OLTP and OLAP approaches to create new types of
analytics. The hybrid operator has access to the temporal graph, modeled time series, and
incoming changes from the graph stream.</p>
<p class="text">
We focus on designing and implementing query operators for hybrid
graph databases that can efficiently retrieve both structured and unstructured data. The goal is
to address the complexity and heterogeneity of data stored in hybrid graphs. Two tasks have been
identified: reviewing existing query languages and operators for graph databases and designing
query operators that can handle the complexity of hybrid graph data. The resulting query
operators should retrieve both entity-centric and relationship-centric information, as well as
hybrid information that combines both entities and relationships.
</p>
</div>
<img src="assets/images/hygraph-operators.png" alt="HyGraph Operators" class="box-image">
</div>
</div>
</div>
</section>
<section id="intelligentAnalytics" class="portfolio-area portfolio-four pb-100">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-9 col-md-10">
<div class="section-title text-center pb-10">
<h3 class="title">Intelligent Analytics</h3>
<p class="text">With HyGraph we aim to provide a variety of analysis and
mining possibilities
for the data represented by the hybrid data model, including classical statistical analysis and
machine learning methods. Two tasks have been identified: the first is to enable analytical
pipelines that combine basic operators with algorithms for temporal graphs
and time series, allowing for the creation of complex pipelines for advanced analytics tasks.
The second task involves developing two mining or learning approaches, namely Hybrid Graph
Clustering and Frequent Hybrid-Graph Mining, based on previous research on clustering and
frequent subgraph mining, as well as adopting machine learning such as Graph Neural Networks to
leverage the structural information contained in the graph.
</p>
</div>
<img src="assets/images/hygraph-operator-combination.png" alt="HyGraph Operator Combination"
class="box-image">
</div>
</div>
</div>
</section>
<section id="Development and Application" class="pricing-area pb-100">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-9 col-md-10">
<div class="section-title text-center pb-10">
<h3 class="title">Development and Application</h3>
<p class="text">The new data model, operators and analysis approaches will prototypically be
implemented, evaluated and applied to at least one use case either from the micro-mobility
domain (bike sharing) or from the IT security domain.
</p>
<p class="text">
We will design and realize the overall
system architecture based on the HyGraph model and addressing challenges
such as handling large data volumes and ensuring performance and scalability. We
will apply it to use cases such as analyzing bike rental
data or modeling system calls to identify IT system intrusions. The goal is to demonstrate the
effectiveness of HyGraph in solving real-world problems and optimizing its design and
implementation.
</p>
</div>
<img src="assets/images/bikeUseCase.png" alt="Use Case" class="box-image">
</div>
</div>
</div>
</section>
<section id="team" class="team-area pt-120 pb-130">
<div class="container">
<div class="row justify-content-center">
<div class="col-lg-6 col-md-10">
<div class="section-title text-center pb-30">
<h3 class="title">Meet The Team</h3>
</div>
</div>
</div>
<div class="row">
<div class="col-lg-3 col-md-7 col-sm-9">
<div class="team-style-eleven text-center mt-30 wow fadeIn" data-wow-duration="1s" data-wow-delay="0s">
<div class="team-image">
<img alt="Team" data-pagespeed-url-hash="1752159307"
src="assets/images/team/ab.png"
onerror="this.onerror=null;pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);">
</div>
<div class="team-content">
<div class="team-social">
<ul class="social">
<li><a href="https://fr.linkedin.com/in/angela-bonifati-11856526"><i
class="lni lni-linkedin-original"></i></a></li>
<!-- Mail block -->
<li><SCRIPT
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<h1 class="title title-news">Kick-off meeting</h1>
<h4>June 31, 2023</h4>
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<h4>November 06-08, 2023</h4>
<p class="text">We had our first face-to-face meeting with our French and German teams at the University of Lyon on 06/11/2023, dedicating two full days to discussing our initial paper ideas and brainstorming the concepts for our new data model.
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<h4>May 28-29, 2024</h4>
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Our French and German teams convened for their second in-person meeting at the University of Leipzig. This productive session was dedicated to refining our HyGraph data model and advancing the vision paper, which had been submitted to PVLDB.
Additionally, a meeting with Ben Steer, CTO of Raphtory, was organized to explore Raphtory’s capabilities and discuss potential collaborative contributions. </p>
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<h2>Evolution of Degree Metrics in Large Temporal Graphs</h2>
<h6>2023</h6>
<p>Christopher Rost, Kevin Gómez, Peter Christen, Erhard Rahm, et al.</p>
<button ><a class="paper-link" href="https://dblp.org/rec/conf/btw/RostGCR23.html"> Read More</a></button>
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<h2>PG-Schema: Schemas for Property Graphs</h2>
<h6>2023</h6>
<p>Renzo Angles, Angela Bonifati, Stefania Dumbrava, George Fletcher, Alastair Green, et al. </p>
<button><a class="paper-link" href="https://dl.acm.org/doi/10.1165/3589778"> Read More</a></button>
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<h2>Distributed temporal graph analytics with GRADOOP</h2>
<h6>2022</h6>
<p>Christopher Rost, Kevin Gómez, Matthias Täschner, Philip Fritzsche, Lucas Schons, et al.</p>
<button><a class="paper-link" href="https://dblp.org/rec/journals/vldb/RostGTFSCAJR22.html"> Read More</a></button>
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<h2>Seraph: Continuous Queries on Property Graph Streams</h2>
<h6>2024</h6>
<p> Christopher Rost, Riccardo Tommasini, Angela Bonifati, Valle E. D., Erhard Rahm, et al.</p>
<button><a class="paper-link" href="https://dbs.uni-leipzig.de/research/publications/seraph-continuous-queries-on-property-graph-streams"> Read More</a></button>
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<h2>Time2Feat: Learning Interpretable Representations forMultivariate Time Series Clustering</h2>
<h6>2022</h6>
<p> Angela Bonifati, Francesco Del Buono, Francesco Guerra, Donato Tiano </p>
<button><a class="paper-link" href="https://dbs.uni-leipzig.de/research/publications/seraph-continuous-queries-on-property-graph-streams"> Read More</a></button>
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<p class="text">This project is funded by the German Research Foundation (DFG) under grant number RA 497/25-1 and the French National Research Agency (ANR) under grant number ANR-22-CE92-0025-01.
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