research_summaries
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| + | particularly those involving oriented matroids, convex polytopes, and other | ||
| + | concepts from discrete geometry. Much of my work involves combinatorial | ||
| + | models for topological structures such as differential manifolds and vector | ||
| + | bundles. The aims of such models include both combinatorial answers to | ||
| + | topological questions (e.g., combinatorial formulas for characteristic | ||
| + | classes), and topological methods for combinatorics (e.g. on topology of | ||
| + | posets). I have also worked on applications of oriented matroids to data analysis in psychology. | ||
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| + | geometric, and spectral invariants of (singular) Riemannian manifolds using | ||
| + | techniques from partial differential equations. For example, the Euler | ||
| + | characteristic of a surface is a topological invariant based its usual | ||
| + | definition in terms of a triangulation of the surface. However, it may also | ||
| + | be considered geometric in view of the Gauss-Bonnet theorem or spectral in | ||
| + | view of the Hodge theorem. I am interested in such relationships on general | ||
| + | singular Riemannian manifolds.</ | ||
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| + | theory intersect. Topics of particular interest are group rings, group schemes | ||
| + | over rings of algebraic integers, Galois module structures and Galois | ||
| + | representations. | ||
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| + | I have done some work in the study of the relationship between exotic | ||
| + | structures and (negative, non-positive) curvature, and its applications | ||
| + | to the limitations of PDE methods in geometry. | ||
| + | group theory, K-theory, mechanics.</ | ||
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| + | statistics and specifically the problem of sequential (quickest) | ||
| + | change-point detection, currently focusing on the case of composite | ||
| + | hypotheses.</ | ||
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| + | I aim to enhance the trustworthiness and reliability of statistics and machine learning methods, particularly in critical domains like healthcare. My work includes developing user-friendly prediction tools with built-in confidence measures and methods for individualized estimation, prediction, and recommendation from observational and interventional data.</ | ||
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| + | My research is focused on: | ||
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| + | <LI> Shimura varieties of Hodge type (which are moduli spaces of polarized abelian varieties endowed with Hodge cycles), | ||
| + | <LI> arithmetic properties of abelian schemes, | ||
| + | <LI> classification of $p$-divisible groups, | ||
| + | <LI> representations of Lie algebras and reductive group schemes, | ||
| + | <LI> crystalline cohomology of large classes of polarized varieties, | ||
| + | <LI> Galois representations associated to abelian varieties, | ||
| + | <LI> arithmetic aspects over finite fields such as Waring problem for matrices and approaches to Jacobian Conjecture, | ||
| + | <LI> arithmetics properties of special classes of rings such as Hermite rings, and | ||
| + | <LI> arithmetic properties of affine algebraic geometry such as automorphisms of affine spaces and Jacobian Conjecture. | ||
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| + | <li> | ||
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| + | the spectral theory of elliptic operators (Laplace operator and Schrödinger operator) on compact or complete manifolds, in particular, on the growth estimates (< | ||
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| + | Li-Yau and Hamilton type gradient estimates, sharp estimates for the heat kernel and the Green' | ||
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| + | <OL> | ||
| + | <LI> Survival analysis. Since 1987, I have been working in this | ||
| + | field, in particular on modeling the interval censored data, | ||
| + | studying consistency and asymptotic normality of the generalized | ||
| + | maximum likelihood estimator (MLE) of survival function or the | ||
| + | semi-parametric estimator under linear regression model. | ||
| + | <LI> Statistical decision theory. My thesis was on admissibility | ||
| + | and minimaxity of the best invariant estimator of a distribution | ||
| + | function. | ||
| + | <LI> Probability model and computing methods for pattern | ||
| + | recognition in the Genome project. | ||
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| + | with combinatorial geometry and graph theory. | ||
| + | is signed, gain, and biased graphs. | ||
| + | structure that leads to new graphical matroids and other new kinds of | ||
| + | graph theory, such as colorings and geometrical representations, | ||
| + | ordinary graphical matroids, colorings, etc., are special cases. | ||
| + | combinatorial geometry I work on arrangements of hyperplanes and | ||
| + | lattice-point counting. | ||
| + | in generalizing Sperner' | ||
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