Ramification in arithmetic geometry

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I studied the structure of graded quotients of the filtration by ramification groups of the absolute Galois group of a local field. Using this, I defined the characteristic variety of an l-adic sheaf under some condition and computed the characteristic class as the intersection product with the 0-section.For an arbitrary constructible sheaf on a variety over a local field, I defined the Swan class and proved a formula of Riemann-Roch type formula in a relative version.I computed explicitly as an induced representation the local Fourier transform of an l-adic representation of the absolute Galois group of a local field of positive characteristic, under a certain assumption.For the p-adic Galois representation associated to a Hilbert modular form, I published a paper establishing the compatibility with the local Langlands correspondence at a prime dividing p in the sense of p-adic Hodge theory