{"id":8112,"date":"2023-07-05T15:20:29","date_gmt":"2023-07-05T19:20:29","guid":{"rendered":"https:\/\/www.yorku.ca\/dighr\/?p=8112"},"modified":"2023-07-16T10:05:29","modified_gmt":"2023-07-16T14:05:29","slug":"recap-graduate-student-led-research-on-probabilistic-modelling-with-machine-learning-for-safe-water-optimization","status":"publish","type":"post","link":"https:\/\/www.yorku.ca\/dighr\/recap-graduate-student-led-research-on-probabilistic-modelling-with-machine-learning-for-safe-water-optimization\/","title":{"rendered":"Recap \u2014 Graduate Student-led Research on Probabilistic Modelling with Machine Learning for Safe Water Optimization"},"content":{"rendered":"\n<p>On September 7, 2022, Dahdaleh graduate student fellow in the Lassonde School of Engineering, Michael De Santi presented his work analyzing the technical aspects of machine learning used in the <a href=\"https:\/\/www.yorku.ca\/dighr\/project\/safe-water-optimization-tool\/\">Safe Water Optimization Tool (SWOT)<\/a><\/p>\n\n\n\n<p>The number of people being displaced has been rapidly growing in the last two due to armed conflict and natural disasters. These crises are often exacerbated as those displaced by conflict and disaster are then exposed to outbreaks of communicable disease in refugee and internally displaced person (IDP) settlements, often due to unsanitary conditions contaminating household stored drinking water. This phenomenon of waterborne illness spreading through previously safe drinking water has been identified in Uganda, Malawi, Kenya, Sudan, and South Sudan, among others.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-1024x1024.jpeg\" alt=\"\" data-id=\"8117\" data-full-url=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-scaled.jpeg\" data-link=\"https:\/\/www.yorku.ca\/dighr\/?attachment_id=8117\" class=\"wp-image-8117\" srcset=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-1024x1024.jpeg 1024w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-300x300.jpeg 300w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-150x150.jpeg 150w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-1536x1536.jpeg 1536w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-B-2048x2048.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-1024x1024.jpeg\" alt=\"\" data-id=\"8116\" data-full-url=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-scaled.jpeg\" data-link=\"https:\/\/www.yorku.ca\/dighr\/?attachment_id=8116\" class=\"wp-image-8116\" srcset=\"https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-1024x1024.jpeg 1024w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-300x300.jpeg 300w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-150x150.jpeg 150w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-1536x1536.jpeg 1536w, https:\/\/www.yorku.ca\/dighr\/wp-content\/uploads\/sites\/181\/2023\/06\/de-Santi-Sept-7-A-2048x2048.jpeg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Chlorine removes pathogens and prevents re-contamination. However, over time free residual chlorine (FRC) can lose its effectiveness and protection which can cause disease spread. There are many factors that contribute to chlorine decay, such as water handling, behavioural interaction, water environmental factors. SWOT aims to probabilistically model FRC decay to forecast the likelihood of having enough FRC to improve chlorination guidance in refugee and IDP settlements.<\/p>\n\n\n\n<p>Michael explained that their use of probabilistic modelling captures a more accurate representation of FRC concentration and allows users to make decisions based on risk. This method of modelling prioritizes two behaviours: the ability to predict unsafe occurrences (i.e., FRC levels fall below 0.2 mg\/ litre) and effectively reproduce underlying distribution of data. One of the challenges faced on the SWOT is that conventional machine learning training approaches do not meet these priorities for probabilistic models. Michael demonstrated how a novel cost-sensitive learning approach aligns the cost function used to train the models with these desired behaviours. This novel approach outperformed a conventional training approach to improve the forecasting abilities of the SWOT. These improvements to the SWOT can provide better FRC targets, lower the risk of recontamination during storage, and ultimately prevent the spread of waterborne illnesses.<\/p>\n\n\n\n<p>Watch the seminar presentation here:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Forecasting Water Quality in Humanitarian Response, with Michael De Santi\" width=\"1778\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/_LweQ2kPqOw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Connect with <a href=\"mailto:desantim@yorku.ca\" target=\"_blank\" rel=\"noreferrer noopener\">Michael De Santi<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>On September 7, 2022, Dahdaleh graduate student fellow in the Lassonde School of Engineering, Michael De Santi presented his work analyzing the technical aspects of machine learning used in the Safe Water Optimization Tool (SWOT) The number of people being displaced has been rapidly growing in the last two due to armed conflict and natural [&hellip;]<\/p>\n","protected":false},"author":1695,"featured_media":6096,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","footnotes":""},"categories":[27,77],"tags":[],"research-theme":[18,19],"stage":[44],"relationship":[63],"class_list":["post-8112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-recap","research-theme-humanitarianism","research-theme-foresighting","stage-active","relationship-internal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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