{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T15:50:20Z","timestamp":1775490620274,"version":"3.50.1"},"reference-count":44,"publisher":"Association for Computing Machinery (ACM)","issue":"2","content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["ACM Trans. Comput. Healthcare"],"published-print":{"date-parts":[[2026,4,30]]},"abstract":"<jats:p>\n                    In this article, we propose a novel two-phase approach to solve the Dynamic Ambulance Routing Problem (DARP), where a significant number of injured persons from different regions require treatment and medical assistance. In such cases, many people call for ambulances, but the availability and number of ambulances are insufficient to reach all patients simultaneously. Consequently, managing the ambulance fleet to respond to all demands as quickly as possible is a crucial research area to explore. In this research, we consider two main types of patients (Hard Emergency Injury [HEI] and Soft Emergency Injury [SEI]) in a dynamic context, where new demands may arise after the ambulance service has started. Furthermore, a mathematical model is proposed to formulate the DARP as a multi-objective problem that minimizes both the travel distance and ride time. To solve this NP-hard problem, we propose a two-phase approach, called\n                    <jats:italic toggle=\"yes\">k<\/jats:italic>\n                    -means-MOPSO, which combines\n                    <jats:italic toggle=\"yes\">k<\/jats:italic>\n                    -means clustering to group the injuries into geographic classes with the Multi-Objective Particle Swarm Optimization (MOPSO) heuristic to route the ambulances. To demonstrate the effectiveness of the\n                    <jats:italic toggle=\"yes\">k<\/jats:italic>\n                    -means-MOPSO approach, this approach is compared with well-known state-of-the-art methods (NSGA-III, NSGA-II, and SPEA2) using various Pareto front metrics, such as Hypervolume, Spacing, and R2 Indicator.\n                  <\/jats:p>","DOI":"10.1145\/3793529","type":"journal-article","created":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T14:27:59Z","timestamp":1771079279000},"page":"1-26","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Optimizing Dynamic Ambulance Routing Problem: A Two-Phase Strategy Combining\n                    <i>K<\/i>\n                    -means Clustering and Multi-Objective Particle Swarm Optimization"],"prefix":"10.1145","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6615-0365","authenticated-orcid":false,"given":"Issam","family":"Zidi","sequence":"first","affiliation":[{"name":"Department of Computer Engineering, College of computer, Qassim University, Buraydah, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-6071-4376","authenticated-orcid":false,"given":"Brahim","family":"Issaoui","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9765-1605","authenticated-orcid":false,"given":"Salim","family":"El Khediri","sequence":"additional","affiliation":[{"name":"Department of Information Technology, College of Computer, Qassim University, Buraydah, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5173-3656","authenticated-orcid":false,"given":"Tarek","family":"Moulahi","sequence":"additional","affiliation":[{"name":"Department of Information Technology, College of Computer, Qassim University, Buraydah, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1304-6265","authenticated-orcid":false,"given":"Sami","family":"Mahfoudhi","sequence":"additional","affiliation":[{"name":"Department of Information and Technology Management, Mediterranean School of Business, South Mediterranean University, Tunis, Tunisia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2026,4,6]]},"reference":[{"issue":"6","key":"e_1_3_1_2_2","doi-asserted-by":"crossref","first-page":"1253","DOI":"10.1111\/itor.12308","article-title":"Vehicle routing and resource distribution in postdisaster humanitarian relief operations","volume":"24","author":"Al Theeb Nader","year":"2017","unstructured":"Nader Al Theeb and Chase Murray. 2017. 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