In order to assess the effect of Social Security reform on current and future workers, it is essential to accurately characterize the initial situations of representative workers affected by reform. For the purpose of analyzing typical reforms, the most important characteristic of a worker is the level and pattern of his or her preretirement earnings. Under the current system, pensions are dete...

4. Noise cancellation. A classical problem in statistical signal processing involves estimating a weak signal (e.g., the heart beat of a fetus) in the presence of a strong interference (the heart beat of its mother) by making two observations; one with the weak signal present and one without (by placing one microphone on the mother’s belly and another close to her heart). The observations can t...

An error in the program for verifying the Ankeny-Artin-Chowla (AAC) conjecture is reported. As a result, in the case of primes p which are ≡ 5 mod 8, the AAC conjecture has been verified using a different multiple of the regulator of the quadratic field Q(√p) than was meant. However, since any multiple of this regulator is suitable for this purpose, provided that it is smaller than 8p, the main...

The Prime Power Conjecture (PPC) states that abelian planar diierence sets of order n exist only for n a prime power. Evans and Mann 2] veriied this for cyclic diierence sets for n 1600. In this paper we verify the PPC for n 2;000;000, using many necessary conditions on the group of multipliers.

drug and health literacy is a key determinant of health outcomes. there are several tools to assess drug and health literacy. the objective of this article is to determine drug literacy level and its relationships with other factors using a single screening tool. a cross- sectional survey was conducted among 1104 people in qazvin province, iran. based on the proportional-to-size method, partici...