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- research-articleNovember 2022
Towards geographically robust statistically significant regional colocation pattern detection
GeoSim '22: Proceedings of the 5th ACM SIGSPATIAL International Workshop on GeoSpatial SimulationPages 11–20https://doi.org/10.1145/3557989.3566158Given a set S of spatial feature-types, its feature-instances, a study area, and a neighbor relationship, the goal is to find pairs <a region (rg), a subset C of S> such that C is a statistically significant regional colocation pattern in region rg. For ...
- research-articleJune 2022
Global Behavior of a Multi–Group Seir Epidemic Model with Spatial Diffusion in a Heterogeneous Environment
International Journal of Applied Mathematics and Computer Science (IJAMCS), Volume 32, Issue 2Pages 271–283https://doi.org/10.34768/amcs-2022-0020AbstractIn this paper, we propose a multi-group SEIR epidemic model with spatial diffusion, where the model parameters are spatially heterogeneous. The positivity and ultimate boundedness of the solution, as well as the existence of a global attractor of ...
- research-articleNovember 2021
Spatial-Net: A Self-Adaptive and Model-Agnostic Deep Learning Framework for Spatially Heterogeneous Datasets
SIGSPATIAL '21: Proceedings of the 29th International Conference on Advances in Geographic Information SystemsPages 313–323https://doi.org/10.1145/3474717.3483970Knowledge discovery from spatial data is essential for many important societal applications including crop monitoring, solar energy estimation, traffic prediction and public health. This paper aims to tackle a key challenge posed by spatial data - the ...
- research-articleAugust 2019
Spatial Ensemble Learning for Heterogeneous Geographic Data with Class Ambiguity
ACM Transactions on Intelligent Systems and Technology (TIST), Volume 10, Issue 4Article No.: 43, Pages 1–25https://doi.org/10.1145/3337798Class ambiguity refers to the phenomenon whereby similar features correspond to different classes at different locations. Given heterogeneous geographic data with class ambiguity, the spatial ensemble learning (SEL) problem aims to find a decomposition ...
- research-articleMay 2019
Multicast Scaling of Capacity and Energy Efficiency in Heterogeneous Wireless Sensor Networks
ACM Transactions on Sensor Networks (TOSN), Volume 15, Issue 3Article No.: 33, Pages 1–32https://doi.org/10.1145/3322497Motivated by the requirement of heterogeneity in the Internet of Things, we initiate the joint study of capacity and energy efficiency scaling laws in heterogeneous wireless sensor networks, and so on. The whole network is composed of n nodes scattered ...
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- demonstrationNovember 2018
Utilizing Reverse Viewshed Analysis in Image Geo-Localization
LocalRec'18: Proceedings of the 2nd ACM SIGSPATIAL Workshop on Recommendations for Location-based Services and Social NetworksArticle No.: 6, Pages 1–5https://doi.org/10.1145/3282825.3282828When users browse beautiful scenery photos uploaded on a social media website, they may have a passion to know about where those photos are taken so that they could view the similar sceneries when they go to the same spot. Advancement in computer vision ...
- research-articleJuly 2018
Hetero-ConvLSTM: A Deep Learning Approach to Traffic Accident Prediction on Heterogeneous Spatio-Temporal Data
KDD '18: Proceedings of the 24th ACM SIGKDD International Conference on Knowledge Discovery & Data MiningPages 984–992https://doi.org/10.1145/3219819.3219922Predicting traffic accidents is a crucial problem to improving transportation and public safety as well as safe routing. The problem is also challenging due to the rareness of accidents in space and time and spatial heterogeneity of the environment (...
- research-articleNovember 2017
Spatial Ensemble Learning for Heterogeneous Geographic Data with Class Ambiguity: A Summary of Results
SIGSPATIAL '17: Proceedings of the 25th ACM SIGSPATIAL International Conference on Advances in Geographic Information SystemsArticle No.: 23, Pages 1–10https://doi.org/10.1145/3139958.3140044Class ambiguity refers to the phenomenon whereby samples with similar features belong to different classes at different locations. Given heterogeneous geographic data with class ambiguity, the spatial ensemble learning (SEL) problem aims to find a ...
- research-articleOctober 2016
Assessment for spatial driving forces of HFMD prevalence in Beijing, China
EM-GIS '16: Proceedings of the Second ACM SIGSPATIALInternational Workshop on the Use of GIS in Emergency ManagementArticle No.: 6, Pages 1–6https://doi.org/10.1145/3017611.3017617Hand-foot-mouth disease (HFMD) outbreak greatly threatened Beijing city, the capital city of China, in 2008. The control prevention of HFMD has become an urgent mission for Beijing Center for Disease Control and Prevention and a focus problem for the ...
- research-articleJanuary 2015
Spatial Invasion Threshold of Lyme Disease
SIAM Journal on Applied Mathematics (SJAM), Volume 75, Issue 3Pages 1142–1170https://doi.org/10.1137/140981769A mathematical model of Lyme disease is formulated to incorporate a spatially heterogenous structure. The basic reproduction number $R_0$ of the disease and its computational formulae are established. It is shown that $R_0$ serves as a threshold value between ...
- research-articleJanuary 2012
Uniqueness and Complete Dynamics in Heterogeneous Competition-Diffusion Systems
SIAM Journal on Applied Mathematics (SJAM), Volume 72, Issue 6Pages 1695–1712https://doi.org/10.1137/120869481In this paper we study the interactions between diffusion and heterogeneity of the environment in the classical diffusive Lotka--Volterra competition systems. In the weak competition case, we establish the uniqueness, hence the global asymptotic stability, ...
- ArticleOctober 2010
Spatial Heterogeneity of Vegetation and Its Causes in Southern Yunnan Province
ISIP '10: Proceedings of the 2010 Third International Symposium on Information ProcessingPages 126–129https://doi.org/10.1109/ISIP.2010.95The research on relationships among terrain, climate and vegetation is a main topic of ecological geography. Taking the moderate resolution imaging spectroradiometer based enhanced vegetation index (MODIS-EVI) and Parameter elevation Regressions on ...
- ArticleJanuary 2010
Cross-layer resource allocation for wireless distributed computing networks
The allocation of communication power consumption and computing rate is inherently one of the cross-layer problems in wireless distributed computing networks (WDCNs). This paper exploits a subgradient approach to choose the optimal power-rate pair for ...
- ArticleNovember 2009
The impact of channel variations on wireless distributed computing networks
Wireless distributed computing has several unique problems compared with currently well investigated wireless sensor networks. These problems include the impact of channel variation on power allocation, different traffic pattern with higher utilization, ...
- ArticleDecember 2007
Space-time mixture model of Infant mortality in peninsular Malaysia from 1990-2000
Disease mapping is a method used to display the geographical distribution of disease occurrence. Recently, this method has received much attention from many researchers including epidemiologists, biostatisticians and medical demographers. Some ...
- articleJune 2003
Aggregation and heterogeneity from the nonlinear dynamic interaction of birth, maturation and spatial migration
Nonlinear Analysis: Real World Applications (NATMA), Volume 4, Issue 2Pages 287–300https://doi.org/10.1016/S1468-1218(02)00016-0We consider a single species structured population distributed in two identical patches connected by spatial dispersal. Assuming that the maturation time for each individual is a random variable with a gamma distribution and that the spatial dispersal ...
- research-articleJanuary 2003
Competing Species near a Degenerate Limit
SIAM Journal on Mathematical Analysis (SIMA), Volume 35, Issue 2Pages 453–491https://doi.org/10.1137/S0036141002402189We consider a competitive reaction-diffusion model of two species in a bounded domain which are identical in all aspects except for their birth rates, which differ by a function g. Under a fairly weak hypothesis, the semitrivial solutions always exist. ...
- research-articleJanuary 2001
A Mathematical Model of the Spread of Feline Leukemia Virus (FeLV) Through a Highly Heterogeneous Spatial Domain
SIAM Journal on Mathematical Analysis (SIMA), Volume 33, Issue 3Pages 570–588https://doi.org/10.1137/S0036141000371757We are concerned with a system of partial differential equations modeling the spread of feline leukemia virus (FeLV) through highly heterogeneous habitats or spatial domains. Our differential equations may feature discontinuities in the coefficients of ...