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This study examines the process whereby functional disability amplifies depressive symptoms through decreasing perceived social support and psychological resources. The study analyzed two waves of panel data (1986 to 1992) of a large sample of older adults from the National Institutes of Aging Established Populations for Epidemiologic Studies of the(More)
In this paper, we study the superconvergence of the error between the discontinuous Galerkin (DG) finite element solution and the exact solution for linear conservation laws when upwind fluxes are used. We prove that if we apply piecewise k-th degree polynomials, the error between the DG solution and the exact solution is (k + 2)-th order superconvergent at(More)
—In communication systems, frequency hopping spread spectrum and direct sequence spread spectrum are two main spread coding technologies. Frequency hopping sequences are used in FH-CDMA systems. In this paper, an earlier idea of constructing optimal sets of frequency hopping sequences is further investigated. New optimal parameters of sets of frequency(More)
OBJECTIVES This study investigated the dynamics and heterogeneity of the frailty index (FI) conceived as a systemic indicator of biological aging in the community-dwelling older adult population in the United States. METHODS We used panel data on multiple birth cohorts from the Health and Retirement Survey 1993-2006 and growth curve models to estimate age(More)