3,064 research outputs found
Consumption, investment and healthcare with aging
Full text linkThis paper solves the problem of optimal dynamic investment, consumption and healthcare spending with isoelastic utility, when natural mortality grows exponentially to reflect the Gompertz law and investment opportunities are constant. Healthcare slows the natural growth of mortality, indirectly increasing utility from consumption through longer lifetimes. Optimal consumption and healthcare imply an endogenous mortality law that is asymptotically exponential in the old-age limit, with lower growth rate than natural mortality. Healthcare spending steadily increases with age, both in absolute terms and relative to total spending. The optimal stochastic control problem reduces to a nonlinear ordinary differential equation with a unique solution, which has an explicit expression in the old-age limit. The main results are obtained through a novel version of Perron’s method
Physiological Response and Protein Expression under Acid Stress of Escherichia coli O157:H7 TWC01 Isolated from Taiwan
No full textShort Communication: American Student Loans: Repayment and Valuation
Full text linkAmerican student loans are fixed-rate debt contracts that give borrowers the option to repay their balances in full by a fixed maturity, or to enroll in income-based schemes, whereby payments are proportional to their income above subsistence, and any balance remaining after several years of payments is forgiven but taxed as income. For a small loan, the cost-minimizing repayment strategy dictates maximum payments until full repayment, forgoing both income-based schemes and forgiveness. For a large loan, income-based repayment is optimal, either immediately or after a period of maximum payments. The critical balance depends on the loan rate, the tax rate, and the forgiveness horizon. Overall, income-based repayment significantly benefits large but not small borrowers
The counterbalance between leptin and cortisol may be associated with comorbid depression and anxiety
No full textModified guard band power detection for coarse carrier frequency offset recovery in OFDM system
No full text[[abstract]]Conventional guard band power detection (GPD) method for orthogonal frequency division multiplexing (OFDM) coarse carrier frequency offset (CFO) estimation has to be operated after the fine CFO recovery due to its sensitivity to the inter-channel interference (ICI). In the paper, modified GPD methods are presented for OFDM system to obtain more accurate estimation of CFO. The accuracy of GPD estimation can be first improved with a simple operation of power average. Then, extending the idea of Reference symbol Power Adjustment (RPA), two general patterns of sub-carrier power adjustment to improve the estimation performance under nonzero fine CFO are presented. According to complete simulations under the COST 207 multi-path fading channel, estimation performance with the presented modified GPD methods can be significantly improved and therefore can be concurrently operated with the fine carrier offset adjustment.[[note]]SC
Detection of viable enterohemorrhagic Escherichia coli O157 using the combination of immunomagnetic separation with the reverse transcription multiplex TaqMan PCR system in food and stool samples.
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To aggregate or not: fibronectin enhances dermal papilla cell aggregation by increasing cell-substratum adhesivity without abating cell motility
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