A schema mapping is a declarative specification of the relationship between instances of a source schema and a target schema. The data exchange (or data translation) problem asks: given an instance over the source schema, materialize an instance (or solution) over the target schema that satisfies the schema mapping. In general, a given source instance may have numerous different solutions. Amon...

In this paper we propose an algorithm for computing large primes p and q such that q divides p4 + p3 + p2 + p+ 1 or p4 − p3 + p2 − p+ 1. Such primes are key parameters for the GiulianiGong Public Key System.

[Purpose] This paper attempted to determine the relationship between physical activity of men from Wrocław and their discretionary income. [Subjects and Methods] The subjects were 1,601 male survey respondents aged from 18 to 65 years old. The International Physical Activity Questionnaire was used for the assessment of physical activity. [Results] Among respondents, low intensity physical activ...

We analyze the taxation of top personal incomes in Germany on the basis of an integrated data file of individual tax returns and a general household survey for the years 1992 2002. The unique feature of this integrated data set is that it includes all taxpayers in the top percentile of the gross income distribution. We show that despite substantial tax base erosion and significant reductions of...

We analyze the taxation of top personal incomes in Germany on the basis of an integrated data file of individual tax returns and a general household survey for the years 1992 – 2002 which includes all taxpayers in the top percentile of the gross income distribution. We show that the distribution of the tax burden is highly concentrated, and that German income taxation has remained effectively p...

"A common hypothesis regarding the distribution of income is that it tends to become more unequal in the initial and middle stages of economic development, in part because of demographic changes. However, previous studies of the effect of demographic changes on income distribution are not based on the underlying micro determinants of the income components." In the present paper, "the micro de...

systems thinking is not a new concept to health system strengthening; however, one question remains unanswered: how policy-makers, system designers and consultants with a system thinking philosophy should act (have acted) as potential change agents in actually gaining opportunities to introduce systems thinking? development of comprehensive multi-year plans (cmyps) for immunization system is on...

Background: Cocaine use is highly prevalent among homeless populations, yet little is known about how it is financed. This study examined associations of income sources with cocaine use and financing of drugs in a longitudinal evaluation of a homeless sample. Methods: A homeless sample was recruited systematically in St. Louis in 1999-2001 and longitudinally assessed annually over two years usi...