Exploiting loop level parallelism in nonprocedural dataflow programs

Discussed are how loop level parallelism is detected in a nonprocedural dataflow program, and how a procedural program with concurrent loops is scheduled. Also discussed is a program restructuring technique which may be applied to recursive equations so that concurrent loops may be generated for a seemingly iterative computation. A compiler which generates C code for the language described below has been implemented. The scheduling component of the compiler and the restructuring transformation are described

Parallel scheduling of recursively defined arrays

A new method of automatic generation of concurrent programs which constructs arrays defined by sets of recursive equations is described. It is assumed that the time of computation of an array element is a linear combination of its indices, and integer programming is used to seek a succession of hyperplanes along which array elements can be computed concurrently. The method can be used to schedule equations involving variable length dependency vectors and mutually recursive arrays. Portions of the work reported here have been implemented in the PS automatic program generation system

How much should Americans be saving for retirement?

How much should Americans save prior to retirement? Given Social Security's shaky financial condition, this is a critical question for baby boomers. A financial planning program-ESPlanner-is applied to data from the Health and Retirement Survey (HRS) to consider the amount that households approaching retirement should save.Retirement ; Saving and investment ; Social security

The Adequacy of Life Insurance: Evidence from the Health and Retirement Survey

This study examines the adequacy of life insurance among married American couples approaching retirement. It improves upon previous work in two ways. First, it is based on recent, high quality data (the 1992 Health and Retirement Survey with matched Social Security earnings histories). Second, it employs new financial planning software to evaluate the life insurance needs of each household. This software embodies an elaborate life- cycle planning model that accounts for a broad array of demographic, economic, and financial characteristics. We find that a sizable minority of couples in the HRS sample are significantly underinsured. Almost one third of wives and more than 10 percent of husbands would have suffered living standard reductions of 20 percent or more had their spouses died in 1992. Underinsurance tends to be more common among low income households, couples with asymmetric earnings, younger households, couples with dependent children, and non-whites. In general, households with greater vulnerabilities do not appear to compensate adequately for these vulnerabilities through greater life insurance holdings. Among some groups, the frequency of underinsurance exceeds two-thirds, and the frequency of severe underinsurance (a reduction in living standard of 40 percent or greater) exceeds one-quarter.

The adequacy of life insurance: evidence from the health and retirement survey

This study examines life insurance adequacy among married American couples approaching retirement based on the 1992 Health and Retirement Survey with matched Social Security earnings histories. It evaluates each household's life insurance needs based on new financial planning software that embodies a life-cycle-planning model and covers a broad array of demographic, economic, and financial characteristics. A sizable minority of households are significantly underinsured. Almost one third of wives and over 10 percent of husbands would have suffered living-standard reductions greater than 20 percent had their spouses died in 1992.Insurance ; Life insurance companies

Growth kinetics effects on self-assembled InAs/InP quantum dots

A systematic manipulation of the morphology and the optical emission properties of MOVPE grown ensembles of InAs/InP quantum dots is demonstrated by changing the growth kinetics parameters. Under non-equilibrium conditions of a comparatively higher growth rate and low growth temperature, the quantum dot density, their average size and hence the peak emission wavelength can be tuned by changing efficiency of the surface diffusion (determined by the growth temperature) relative to the growth flux. We further observe that the distribution of quantum dot heights, for samples grown under varying conditions, if normalized to the mean height, can be nearly collapsed onto a single Gaussian curve.Comment: 2 figure

The mismatch between life insurance holdings and financial vulnerabilities: evidence from the Health and Retirement Survey

Using data on older workers from the 1992 Health and Retirement Survey, along with an elaborate life-cycle planning model, the authors quantify the effect of each individual's death on the financial status of his or her survivors and the degree to which life insurance holdings moderate these consequences. The average change in living standard that would result from a spouse's death is small, both in absolute terms and relative to the decline that would occur without insurance. However, this average obscures a startling mismatch between insurance holdings and underlying vulnerabilities. For many of the most vulnerable, the amounts purchased are surprisingly small, and for many of the least vulnerable, the amounts are surprisingly large. As a result, uninsured vulnerabilities are quite widespread. The magnitude of these vulnerabilities, as well as the proclivity to address any given degree of vulnerability by purchasing life insurance, vary systematically with individual and household characteristics.Life insurance companies

The Mismatch Between Life Insurance Holdings and Financial Vulnerabilities: Evidence from the Survey of Consumer Finances

Using the 1995 Survey of Consumer Finances and an elaborate life-cycle model, we quantify the potential financial impact of each individual's death on his or her survivors, and we measure the degree to which life insurance moderates these consequences. Life insurance is essentially uncorrelated with financial vulnerability at every stage of the life cycle. As a result, the impact of insurance among at-risk households is modest, and substantial uninsured vulnerabilities are widespread, particularly among younger couples. Roughly two-thirds of poverty among surviving women and more than one-third of poverty among surviving men results from a failure to insure survivors against an undiminished living standard. We also identify a systematic gender bias: for any given level of financial vulnerability, couples provide significantly more protection for wives than for husbands.

The mismatch between life insurance holdings and financial vulnerabilities: evidence from the Survey of Consumer Finances

Using the 1995 Survey of Consumer Finances and an elaborate lifecycle model, we quantify the potential financial impact of each individual’s death on his or her survivors, and we measure the degree to which life insurance moderates these consequences. Life insurance is essentially uncorrelated with financial vulnerability at every stage of the life cycle. As a result, the impact of insurance among at-risk households is modest, and substantial uninsured vulnerabilities are widespread, particularly among younger couples. Roughly two-thirds of poverty among surviving women and more than one-third of poverty among surviving men results from a failure to insure survivors against an diminished living standard. We also identify a systematic gender bias: for any given level of financial vulnerability, couples provide significantly more protection for wives than for husbands.Insurance industry