{"doi":"10.1109/mdm55031.2022.00068","title":"Efficient Detection of COVID-19 Exposure Risk","abstract":"In this demo paper, we present the new module of our HealthDist system that performs contact tracing in a privacy-preserving manner and considers the COVID-19 exposure risk. This is achieved by answering a new spatio-temporal query, dubbed ST-Aggregate Join, which calculates the COVID-19 exposure risk of an individual on their devices. It utilizes a special-purpose access structure to record the trajectories of users on their devices and optimize the ST-Aggregate Join processing. We demonstrate interactively using a smartphone application how our system can provide effective contact tracing within a university campus. We also illustrate how our new module is working through an intuitive web interface that shows the exposure risk of a person by coloring the trajectory of the infected person and the person(s) in high risk in a preloaded real dataset.","journal":"2022 23rd IEEE International Conference on Mobile Data Management (MDM)","year":2022,"id":310866,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":0,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9551,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2022-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1007219,"name":"Rakan Alseghayer","orcid":null,"position":1,"is_corresponding":false},{"id":1007220,"name":"Benjamin Graybill","orcid":null,"position":2,"is_corresponding":false},{"id":1006856,"name":"Xiaozhong Zhang","orcid":"0000-0002-6998-8243","position":3,"is_corresponding":false},{"id":764279,"name":"Constantinos Costa","orcid":"0000-0003-1471-2167","position":4,"is_corresponding":false},{"id":402711,"name":"Panos K. Chrysanthis","orcid":"0000-0001-7189-9816","position":5,"is_corresponding":false},{"id":1006855,"name":"Brian T. Nixon","orcid":"0009-0002-3682-1938","position":0,"is_corresponding":true}],"reference_count":6,"raw_metadata":null,"created_at":"2026-07-19T00:33:24.451129Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}