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Modeling calving process of glacier with dilated polyhedral discrete element method

Acta Oceanologica Sinica 2021年第7期40卷 159-169页

作者： Lu Liu Ji Li Qizhen Sun Chunhua Li sue cook Shunying Ji State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China National Marine Environmental Forecasting Center Beijing 100081China Institute for Marine and Antarctic Studies University of TasmaniaHobart 7001Australia

Mass loss caused by glacier calving is one of the direct contributors to global sea level *** calving laws are required for accurate modelling of ice sheet mass *** continuous and discontinuous methods have been used for glacial calving *** this study,the discrete element method(DEM)based on dilated polyhedral elements is introduced to simulate the calving process of a tidewater *** polyhedrons can be obtained from the Minkowski sum of a sphere and a core *** elements can be utilized to generate a continuum ice material,where the interaction force between adjacent elements is modeled by constructing bonds at the joints of the common faces.A hybrid fracture model considering fracture energy is *** viscous creep behavior of glaciers on long-term scales is not *** applying buoyancy and gravity to the modelled glacier,DEM results show that the calving process is caused by cracks which are initialized at the top of the glacier and spread to the *** results demonstrate the feasibility of using the dilated polyhedral DEM method in glacier simulations,additionally allowing the fragment size of the breaking fragments to be *** relationship between crack propagation and internal stress in the glacier is analyzed during calving *** the analysis of the Mises stress and the normal stress between the elements,it is found that geometric changes caused by the glacier calving lead to the redistribution of the *** tensile stress between the elements is the main influencing factor of glacier ice *** addition,the element shape,glacier base friction and buoyancy are studied,the results show that the glacier model based on the dilated polyhedral DEM is sensitive to the above conditions.

关键词： glacier calving discrete element method dilated polyhedral element bond and fracture model

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Stratification of Patients with Diabetes Using Continuous Glucose Monitoring Profiles and Machine Learning

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Health Data Science 2022年第1期2022卷 144-152页

作者： Yinan Mao Kyle Xin Quan Tan Augustin Seng Peter Wong sue-Anne Toh Alex R.cook Saw Swee Hock School of Public Health National University of Singapore and National University Health SystemSingapore Department of Statistics and Data Science National University of SingaporeSingapore NOVI Health Singapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Duke-NUS Medical School Singapore

*** glucose monitoring(CGM)offers an opportunity for patients with diabetes to modify their lifestyle tobetter manage their condition and for clinicians to provide personalized healthcare and lifestyle ***,analytic toolsare needed to standardize and analyze the rich data that emerge from CGM *** would allow glucotypes of patients tobe identified to aid clinical *** this paper,we develop an analysis pipeline for CGM data and applyit to 148 diabetic patients with a total of 8632 days of follow *** pipeline projects CGM data to a lower-dimensional spaceof features representing centrality,spread,size,and duration of glycemic excursions and the circadian *** then useprincipal components analysis and k-means to cluster patients’records into one of four glucotypes and analyze clustermembership using multinomial logistic *** differ in the degree of control,amount of time spent inrange,and on the presence and timing of hyper-and *** on the program had statistically significantimprovements in their glucose *** pipeline provides a fast automatic function to label raw CGM datawithout manual input.

关键词： Patients Profiles membership

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