{ "148410-21904197": { "datetime_modified":"20260522T140614", "datetime_start":"20260604T140000", "datetime_end":"20260604T160000", "has_end_time":1, "date_start":"2026-06-04", "date_end":"2026-06-04", "time_start":"14:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Combinatorial Optimization Problems Arising from Graph-Based Models", "occurrence_title":"", "combined_title":"Combinatorial Optimization Problems Arising from Graph-Based Models: Samuel Boardman", "event_subtitle":"Samuel Boardman", "event_type":"Presentation", "event_type_id":"16", "description":"Abstract:\n\nWe propose and analyze several graph-defined combinatorial optimization problems inspired by multiple application areas. \n\nFirst, we consider an influence maximization model that uses the independent cascade approach, but allows two types for packets of information, +1 and -1. These represent the change in a receiver's sentiments on a product or belief on an empirical question (regarded as their \"bias\"), which can be justified via Bayes' rule. The algorithmic problems we study may be viewed as taking a more fine-grained approach to traditional influence maximization problems, and correspondingly exhibit non-trivial behavior even in the unbudgeted version where packets are unlimited\u2014including tractability that depends on the probability parameters of the independent cascade dynamics. On the other hand, we obtain NP-hardness results for the budgeted version more analogous to previous work. Several natural heuristics are shown to induce substantial reductions of bias in simulations with well-known social network datasets. \n\nNext, given an undirected graph representing similarities between a set of items and an additive measure evaluating them, we treat the position of a special subset of items in an ordinal ranking through a collection of problems in which items may be combined if they are similar. The objective for these problems is to either maximize or minimize the absolute or relative rank of the special subset, with a meta-goal of assessing the robustness of the rank, even in the presence of a well-defined criterion. We classify the computational complexity of all four problems, mostly finding worst-case hardness, then find exact and approximate solutions to special cases and variants of the problems. These structured cases are inspired by numerous real-world examples and may be used to assess commonly cited facts across disparate domains, as we demonstrate for sources of greenhouse gas emissions that contribute to climate change. We then adapt our framework to require subsets of comparable measure, converting the above ranking problems into redistricting problems, with analogues to the former's grid variants. Emphasis is placed on worst-case deviations from proportional representation and an urban-rural model in which gerrymandering ability is curtailed.", "occurrence_notes":null, "guid":"148410-21904197@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148410", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics","Graduate Students","Graduate","Dissertation"], "website":"", "sponsors":[ { "group_name":"Dissertation Defense - Department of Mathematics", "group_id":"4889", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/05\/event_148410_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/05\/event_148410_original-1.jpg", 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with course recommendations, navigate our pre-health website, and apply resources to your pre-health journey.", "occurrence_notes":null, "guid":"147885-21902303@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/147885", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":1, "livestream_type":"zoom", "livetream_require_login":0, "livestream_id":"94461077090", "livestream_link":"https:\/\/umich.zoom.us\/j\/94461077090", "cost":"", "tags":["Pre Med","Newnan Lsa Academic Advising Center","Newnan Academic Advising","Newnan","Advising"], "website":"", "sponsors":[ { "group_name":"Newnan LSA Pre-Health", "group_id":"4049", "website":"" }, { "group_name":"Newnan LSA Academic Advising Center", "group_id":"3721", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", 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shelves!\u00a0If you are outside the U-M community, please reach out to maize.blue.cupboard@umich.edu to sign up.", "occurrence_notes":null, "guid":"102102-21904133@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/102102", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"Maize and Blue Cupboard inside Betsy Barbour", "has_livestream":0, "cost":"", "tags":["Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/3152", "sponsors":[ { "group_name":"Sessions @ Michigan", "group_id":"4791", "website":"https:\/\/sessions.studentlife.umich.edu\/" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, 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"combined_title":"Marianetta Porter: Breath, Fragment, Return", "event_subtitle":"", "event_type":"Exhibition", "event_type_id":"7", "description":"\n\nCurated by Juana Williams, this exhibition examines how Marianetta Porter uses everyday objects, fragments, and embodied memory to make absence an active, living presence while challenging linear histories. Rooted in African American experience, her practice treats what is discarded, overlooked, or missing not as loss, but as a source of meaning that continues to act on the present. Through her process and materials, Porter reveals how memory is carried in the body and embedded in ordinary things. Her work also resists forward-moving notions of time, instead presenting a diasporic temporality in which past, present, and lived experience circulate together through repetition, touch, and recall. In doing so, Porter proposes a vision of history as unfinished, memory as active, and absence as a force that sustains connection and shapes the present. \n\nMarianetta Porter is a visual artist and product designer whose research and creative practice are grounded in the study of African American history, culture, and representation. Through the language of visual art, she draws connections between historic memory and contemporary African American life, giving voice to the history of the African diaspora while acknowledging its central influence on the birth and flourishing of American culture.\n\nHer work has been exhibited nationally at institutions such as the Indianapolis Museum of Art, the Chicago Museum of Science and Industry, the Spoleto Festival, the Harriet Tubman Museum, and the Hampton University Museum of Art.\n\nShe earned her Bachelor of Fine Arts from Hampton University and her Master of Fine Arts from the University of Michigan. The recipient of numerous awards, Porter is Professor Emeritus at the University of Michigan\u2019s Stamps School of Art and Design.\n\nJuana Williams is a curator and writer whose work explores the intersections of cross-border intellectual history, cultural memory, and identity formation as expressed through modern and contemporary art from Africa and its diasporas.\n\nWilliams has held curatorial and academic appointments at organizations including the Detroit Institute of Arts, Library Street Collective, Wayne State University, and the Urban Institute for Contemporary Art. Her curatorial projects have been presented at institutions across the United States and France, including the Grand Rapids Art Museum, the Muskegon Museum of Art, Palais de Tokyo (Paris), and the Westmoreland Museum of American Art. In addition, she has presented lectures at various museums and universities and contributed to numerous exhibition catalogs. Her work has been written about in publications such as Artsy, Beaux Arts Magazine, Cond\u00e9 Nast Traveller, Michigan Chronicle, and Observer. Williams holds a BA in Fine Art and an MA in Art History from Wayne State University.", "occurrence_notes":null, "guid":"147625-21901371@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/147625", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Stamps Gallery, 201 South Division Street Ann Arbor, Michigan 48104", "has_livestream":0, "cost":"", "tags":["Art"], "website":"https:\/\/stamps.umich.edu\/events\/marianetta-porter-breath-fragment-return", "sponsors":[ { "group_name":"Penny W Stamps School of Art & Design", "group_id":"3157", "website":"http:\/\/stamps.umich.edu\/" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/04\/event_147625_original-2.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/04\/event_147625_original-2.jpg" }, "occurrence_count":31, "first_occurrence":21901371 } , "147626-21901402": { "datetime_modified":"20260416T121510", "datetime_start":"20260604T180000", "datetime_end":"20260604T200000", "has_end_time":1, "date_start":"2026-06-04", "date_end":"2026-06-04", "time_start":"18:00:00", "time_end":"20:00:00", "time_zone":"America\/Detroit", "event_title":"Opening Reception - Marianetta Porter: Breath, Fragment, Return", "occurrence_title":"", "combined_title":"Opening Reception - Marianetta Porter: Breath, Fragment, Return", "event_subtitle":"", "event_type":"Reception \/ Open House", "event_type_id":"17", "description":"\n\nOn Thursday, June 4, from 6-8 p.m., join us for the public opening reception of Marianetta Porter: Breath, Fragment, Return at Stamps Gallery.\n\nCurated by Juana Williams, this exhibition examines how Marianetta Porter uses everyday objects, fragments, and embodied memory to make absence an active, living presence while challenging linear histories. Rooted in African American experience, her practice treats what is discarded, overlooked, or missing not as loss, but as a source of meaning that continues to act on the present. Through her process and materials, Porter reveals how memory is carried in the body and embedded in ordinary things. Her work also resists forward-moving notions of time, instead presenting a diasporic temporality in which past, present, and lived experience circulate together through repetition, touch, and recall. In doing so, Porter proposes a vision of history as unfinished, memory as active, and absence as a force that sustains connection and shapes the present. \n", "occurrence_notes":null, "guid":"147626-21901402@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/147626", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Stamps Gallery, 201 South Division Street Ann Arbor, Michigan 48104", "has_livestream":0, "cost":"", "tags":["Art"], "website":"https:\/\/stamps.umich.edu\/events\/opening-reception-marianetta-porter-breath-fragment-return", "sponsors":[ { "group_name":"Penny W Stamps School of Art & Design", "group_id":"3157", "website":"http:\/\/stamps.umich.edu\/" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/04\/event_147626_original-2.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/04\/event_147626_original-2.jpg" }, "occurrence_count":1, "first_occurrence":21901402 } }