1,868 research outputs found
Richard Koenig: See Change: A Memoir
No full textPublished online only at http://lenscratch.com/2022/07/richard-koenig-see-change-a-memoir/In this article, a memoir of sorts, the author outlines “mutations of a medium [fine art photography in the
United States], and one it its disciples, over time”. This covers more than forty years beginning with his
formal study of photography at Indiana University in 1979, through his time at Pratt Institute in Brooklyn,
New York, and on to the current time and his latest project, “City as Metaphor.
Is there a persistence problem? Part 2: Maybe not
No full textIn Part 1 of this two-part series, Evan Koenig explains why some economists are skeptical that staggered price adjustment can account for monetary policy's sustained effects on aggregate economic activity. In Part 2, Koenig looks at labor-market imperfections as a possible source of persistence. He concludes that persistence is much easier to obtain if either labor cannot move freely from firm to firm or wages are set in overlapping wage contracts.Monetary policy ; Employment (Economic theory)
Supplemental Material, Logistic_regression_tables_28viii17 - Associations between Depressive Symptomatology and Neurocognitive Impairment in HIV/AIDS
No full text
Supplemental Material, Logistic_regression_tables_28viii17 for Associations between Depressive Symptomatology and Neurocognitive Impairment in HIV/AIDS by Sarah Tymchuk, Daniela Gomez, Noshin Koenig, M. John Gill, Esther Fujiwara, and Christopher Power in The Canadian Journal of Psychiatry
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Co-Design of Topology, Scheduling, and Path Planning in Automated Warehouses
No full textWe address the warehouse servicing problem (WSP) in automated warehouses, which use teams of mobile agents to bring products from shelves to packing stations. Given a list of products, the WSP amounts to finding a plan for a team of agents which brings every product on the list to a station within a given timeframe. The WSP consists of four subproblems, concerning what tasks to perform (task formulation), who will perform them (task allocation), and when (scheduling) and how (path planning) to perform them. These subproblems are NP-hard individually and are made more challenging by their interdependence. The difficulty of the WSP is compounded by the scale of automated warehouses, which frequently use teams of hundreds of agents. In this paper, we present a methodology that can solve the WSP at such scales. We introduce a novel, contract-based design framework which decomposes an automated warehouse into traffic system components. By assigning each of these components a contract describing the traffic flows it can support, we can syn-thesize a traffic flow satisfying a given WSP instance. Component-wise search-based path planning is then used to transform this traffic flow into a plan for discrete agents in a modular way. Evaluation shows that this methodology can solve WSP instances on real automated warehouses
Task Assignment, Scheduling, and Motion Planning for Automated Warehouses for Million Product Workloads
No full textWe address the Warehouse Servicing Problem (WSP) in automated warehouses, which use teams of mobile robots to move products from shelves to packaging stations. Given a list of products, the WSP amounts to finding a motion plan which brings every product on the list from a shelf to a packaging station within a given time limit. The WSP consists of four subproblems, namely, deciding where to source and deposit a product (task formulation), who should transport each product (task assignment) and when (scheduling) and how (motion planning). These problems are NP-Hard individually and made more challenging by their interdependence. The difficulty of the WSP is compounded by the scale of automated warehouses, which use teams of hundreds of agents to transport thousands of products. In this paper, we present Contract-based Cyclic Motion Planning (CCMP), a novel contract-based methodology for solving the WSP at scale. CCMP decomposes a warehouse into a set of traffic system components. By assigning each component a contract which describes the traffic flows it can support, CCMP can generate a traffic flow which satisfies a given WSP instance. CCMP then uses a novel motion planner to transform this traffic flow into a motion plan for a team of robots. Evaluation shows that CCMP can solve WSP instances taken from real industrial scenarios with up to 1 million products while outperforming other methodologies for solving the WSP by up to 2.9x
Sustaining the Science Impact of Summit Station, Greenland: A white paper produced from the Summit Station Science Summit
No full textLora Koenig, Bruce Vaughn, John F. Burkhart, Zoe Courville, Jack Dibb, Robert Hawley, Richard B. Alley, Abigail Vieregg, Steve Montzka, Ian M. Howat, David D. Turner, Richard Cullather, Ryan R. Neely III, Nimesh A. Patel, Vasilii Petrenko, Matthew Shupe, Hans Christian Steen-Larsen, Von P. Walden, Erich C. Osterberg, Irina Petropavlovskikh, Kelly Brunt, Tom Neumann, Lynn Montgomery, Matt Okraszewski, Christine Shultz, Sandy Starkweather, Brain Vasel, Christopher Shuman, Detlev HelmigThe lead authors would like to thank the National Science Foundation Arctic Science Section for
funding this workshop and report through NSF award #PLR 1738123.https://geo-summit.org/sites/default/files/docs/SummitSummitReport_FINAL.pd
A Fly-Fisherman's Michigan Summer
No full text38 p.The author uses photography to tell the story of how man interacts with nature while fly-fishing to rivers of Michigan
DS_10.1177_0363546518757758 – Supplemental material for Effects of Arthroscopy for Femoroacetabular Impingement Syndrome on Quality of Life and Economic Outcomes
No full textSupplemental material, DS_10.1177_0363546518757758 for Effects of Arthroscopy for Femoroacetabular Impingement Syndrome on Quality of Life and Economic Outcomes by Richard C. Mather, Shane J. Nho, Andrew Federer, Berna Demiralp, Jennifer Nguyen, Asha Saavoss, Michael J. Salata, Marc J. Philippon, Asheesh Bedi, Christopher M. Larson, J.W. Thomas Byrd, and Lane Koenig in The American Journal of Sports Medicine</p
Moments Within the Spaces : 3 Months on East Amatuli
No full text32 p.The author describes the process of creating an exhibition of photographs taken while working with a small team studying seabirds in Alaska
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