Replica Selection in the Globus Data Grid

The Globus Data Grid architecture provides a scalable infrastructure for the management of storage resources and data that are distributed across Grid environments. These services are designed to support a variety of scientific applications, ranging from high-energy physics to computational genomics, that require access to large amounts of data (terabytes or even petabytes) with varied quality of service requirements. By layering on a set of core services, such as data transport, security, and replica cataloging, one can construct various higher-level services. In this paper, we discuss the design and implementation of a high-level replica selection service that uses information regarding replica location and user preferences to guide selection from among storage replica alternatives. We first present a basic replica selection service design, then show how dynamic information collected using Globus information service capabilities concerning storage system properties can help improve and optimize the selection process. We demonstrate the use of Condor's ClassAds resource description and matchmaking mechanism as an efficient tool for representing and matching storage resource capabilities and policies against application requirements.Comment: 8 pages, 6 figure

Child labor and schooling in Ghana

Child labor is a widespread, growing problem in the developing world. About 250 million of the world's children work, nearly half of them full-time. Child labor (regular participation in the labor force to earn a living or supplement household income) prevents children from participating in school. One constraint on Ghana's economic growth has been inadequate human capital development. According to 1992 data for Ghana, one girl in three and one boy in four does not attend school. The figures are worse in rural areas. The authors studied the dynamics of how households decided whether to send children 7 through 14 to school or to work, using household survey data for 1987-92. They do not address the issue of street kids, which does not imply that they are less important than the others. Unlike child labor in Asia, most child labor in Africa, especially Ghana, is unpaid work in family agricultural enterprises. Of the 28 percent of children engaged in child labor, more than two-thirds were also going to school. Of all children between 7 and 14, about 90 percent helped with household chores. Boys and girls tend to do different types of work. Girls do more household chores while boys work in the labor force. The data do not convincingly show, as most literature claims, that poverty is the main cause of child labor. But poverty is significantly correlated with the decision to send children to school, and there is a significant negative relationship between going to school and working. Increased demand for schooling is the most effective way to reduce child labor and ensure that Ghana's human capital is stabilized. The high cost of schooling and the poor quality and irrelevance of education has also pushed many children into work. And family characteristics play a big role in the child's decision to work or go to school. The father's education has a significant negative effect on child labor; the effect is stronger on girls than on boys. So adult literacy could indirectly reduce the amount of child labor.Health Economics&Finance,Public Health Promotion,Health Monitoring&Evaluation,Children and Youth,Labor Policies,Street Children,Youth and Governance,Children and Youth,Poverty Assessment,Health Monitoring&Evaluation

Employment, labor markets, and poverty in Ghana

The slowdown and possible reversal in the rural-to-urban flow of labor in Ghana is symptomatic of a basic shortcoming in the country's economic recovery: the inadequate growth of the productive sector in the non-agricultural economy. The rate of growth of GDP has been adequate but much of the growth has been fueled and led by the services sector, which (at more than 46 percent) has surpassed agricultural as the main contributor to GDP. In some way growth in the services sector has been positive, but arguably it is a once-for-all adjustment to recovery that cannot be sustained at this growth rate without commensurate growth in both agricultural and non-agricultural production. Evidently, stabilization and liberalization measures have not been sufficient to put the industrial sector on a path of sustained growth. There is too little skilled labor in Ghana, and demand for industrial goods has been weak, in part because the cost of credit is high and savings are too low for inefficient, state-run enterprises to buy the equipment they need. Returns to higher (especially university) education are high in Ghana, largely because of high wages for government services. Because of inadequate technical and vocational education, returns to secondary education are low. Employment trends have mirrored the deficiencyin output growth. Every year since 1987, industrial employment has fallen. Every year since 1987, industrial employment has fallen. The growing labor force, which agriculture could not absorb productively, has spilled over into service activities and the informal sector is symptomatic of an economy with low growth potential. In the medium term, the surest way to absorb labor would be to increase investment in the agriculture sector by changing the composition in public spending. As long as the public sector wage bill remains a sizable part of government expenditure, an increase in wage levels not compensated by reduction in employment will create strains in the budgetary balance and will defeat the most important instrument of increasing the growth rate of employment--higher levels of public investment in agriculture. It is possible that a vicious circle is complete. Higher wages in the public sector might be necessary to increase efficiency, without which productive public investment is not possible. But if the government is not willing or able to reduce public employment, and is further unable to alter the composition of expenditure to provide more finance for agriculture-related public investment, a high wage public policy will merely fuel inflationary pressures and reduce the real investment ratio. The only way out of this vicious circle is a larger infusion of foreign and private investment than has been seen so far, supplemented by corrective monetary policy.Labor Policies,Environmental Economics&Policies,Banks&Banking Reform,Public Sector Economics&Finance,Public Health Promotion,Environmental Economics&Policies,Economic Stabilization,Public Sector Economics&Finance,Banks&Banking Reform,Health Monitoring&Evaluation

Public health and education spending in Ghana in 1992-98 : issues of equity and efficiency

Using primary data from the health and education ministries, and household survey data from the Ghana Statistical Service, the authors analyze equity, and efficiency issues in public spending on health, and education in Ghana in the 1990s. Public expenditures in the education sector, declined in the second half of the 1990s. Basic education enrollment has been stagnant, or declining in public schools, but increasing in private schools, resulting in a moderate increase in total enrollment. Regional disparities are significant, with lower public resource allocations, and lower enrollment ratios in the three poorest regions. The quality of basic education in public schools remains poor, while it has steadily improved in privateschools. Enrollments in higher levels are lagging behind those in basic education. Ghana ranks high among West African countries in health indicators, although its health expenditures tend to favor the non-poor. While more of the rural population have gained access to health services in recent years, many still have limited access, or none. Moreover, there is no link between the pattern of public expenditures - especially the pattern of immunization across Ghana - and health outcomes. To ensure that social services are efficiently, and equitably delivered in a fiscally constrained economy, the authors argue, public expenditures need to be linked to outcomes.Primary Education,Curriculum&Instruction,Teaching and Learning,Public Health Promotion,Health Monitoring&Evaluation,Primary Education,Teaching and Learning,Gender and Education,Health Monitoring&Evaluation,Curriculum&Instruction

Gender, poverty, and nonfarm employment in Ghana and Uganda

The authors provide evidence that women's non-farm activities help reduce poverty in two economically and culturally different countries, Ghana and Uganda. In both countries rural poverty rates were lowest - and fell most rapidly - for female heads of household engaged in non-farm activities. Participation in non-farm activities increased more rapidly for women, especially married women and female heads of household, than for men. Women were more likely than men to combine agriculture and non-farm activities. In Ghana it was non-farm activities (for which income data are available ) that provided the highest average incomes and the highest shares of income. Bivariate profit analysis of participation shows that in Uganda female heads of household and in Ghana women in general are significantly more likely than men to participate in non-farm activities and less likely to participate in agriculture.Health Monitoring&Evaluation,Public Health Promotion,Agricultural Knowledge&Information Systems,Environmental Economics&Policies,Health Economics&Finance,Health Monitoring&Evaluation,Agricultural Knowledge&Information Systems,Poverty Assessment,Environmental Economics&Policies,Health Economics&Finance

Ghana's labor market (1987-92)

Using the household survey and other data sources, the authors analyze returns to education and other aspects of Ghana's labor market profile from 1987 to 1991. The labor force grew slower than the population did between 1980 and 1990, but the supply of labor is expected to increase as the population of youth is expected to grow faster from 1990 to 2000. And labor force participation rates for 26- to 45-year-olds have been increasing rapidly. Over time, the average labor force participation rates of women have become equal to men's; that of children younger than 15 has remained unchanged at 38 percent. More than half of Ghana's child laborers are employed in agriculture. The formal sector's share of employment is on the decline, while the private informal sector's share has increased, especially in urban areas. Over time, the informal sector (in which most workers have a primary education or less) has absorbed more labor than the formal sector (in which most workers have middle or secondary schooling). Unemployment is pervasive in urban areas, and is less visible in rural areas. Labor productivity may not have increased and is possibly declining. Between 1987 and 1992, there was reverse migration, with many people moving from urban to rural areas, mostly for family reasons. Employment-related migration has also been on the increase. As is true elsewhere, the level of education affects participation in the labor force. Literacy rates for women are lower than those for men, which is one reason men dominate the private formal sector. The rate of return to education increases with higher education and work experience. The return for each additional year of schooling rangesfrom 4 percent to 6 percent in Ghana, quite high for a Sub-Saharan African country. Private and social returns to education are greater for primary than for secondary or postsecondary education.Public Health Promotion,Health Economics&Finance,Health Monitoring&Evaluation,Labor Policies,Environmental Economics&Policies,Health Monitoring&Evaluation,Environmental Economics&Policies,Health Economics&Finance,Labor Standards,Poverty Assessment

The evolution of poverty and welfare in Nigeria, 1985-92

The authors profile Nigerian poverty, showing its evolution from 1985 to 1992. This paper is divided into 6 sections, beginning with an overview. Section 2 looks at the sources of data used. Section 3 examines household income and expenditure distribution, interprets poverty indices, and calculates relative poverty lines for Nigeria. Section 4, the paper's core, presents the spatial characteristics of poverty in Nigeria and their evolution over the seven-year period, indicating in which regions and states the poor are located and the extent and severity of their poverty; lays out the poor's basic demographic characteristics including time use and employment patterns, detailing how these have evolved; features the roles the poor play in various sectors of the economy; and discuss how changes in poverty could be explained by growth-related and redistribution factors. Section 5 discusses the evolution of expenditures and explains how expenditure patterns correspond to poverty. Section 6 presents conclusions, among them: the extremely poor -who dominate the ranks of the uneducated- became poorer, while all other income groups had a higher standard of living; an increase in mean per capita household spending reduced the proportion of the population in poverty but different regions did not share equally in the benefits of growth; household spending grew faster in southern and central Nigeria and slower in the north; and poverty was overwhelmingly rural and regional, but also greatly influenced by age, educaton, and the nature of employment.Public Health Promotion,Environmental Economics&Policies,Health Economics&Finance,Poverty Reduction Strategies,Services&Transfers to Poor,Poverty Assessment,Environmental Economics&Policies,Achieving Shared Growth,Health Economics&Finance,Poverty Lines

The structure and determinants of inequality and poverty reduction in Ghana, 1988-92

Using three rounds of the Ghana Living Standard Survey, conducted between 1988 and 1992, the authors present findings that shed light on the structure of inequality among different socioeconomic groups in different geographic areas, in the context of poverty reduction. First, poverty reduction can be attributed mainly to improvements in both average levels of income and the pattern of its distribution in the informal and nonfarm sectors in other cities and rural areas outside the capital city, Accra. Second, an analysis of different measures of inequality reveals that the most important changes in the degree of inequality took place at the lower end of the distribution. But the direction of change was different in Accra compared with the localities outside Accra. In Accra, while inequality increased overall, the inequality in the lower part of the distribution increased much more. In other cities, there was a more or less uniform improvement all along the distribution. But in the rural areas, there was a significant improvement at the lower end, but a deterioration at the upper end. Third, structural adjustment - which aimed to cut back public sector employment and stimulate activities in the private sector - raised living standards in rural areas and other cities, but not in Accra. The public sector is much larger in Accra than in other cities and rural areas. Contraction of the public sector in other cities and rural areas was compensated for by income growth in the informal and nonfarm sectors. But contraction of Accra's large public sector dominated the local economy, so living standards declined in both formal and informal sectors. Accra's economy will probably grow as its private and informal sectors grow. Fourth, major shifts in the population occurred in all localities from the formal to the informal sector, but the magnitude of the shift was largest in Accra - in fact, several times more than in the other localities. The deterioration of the income at the lower part of the distribution in both the formal and the informal sectors is mainly responsible for the decline in the welfare of the low income households in Accra. These findings suggest that an integrated regional strategy, taking into account the local socioeconomic structure, is necessary for achieving economic growth and poverty reduction in all regions. Anotherimportant finding: The poor do not benefit as much from education as the nonpoor do because there is very low return (in income) to primary education, the highest level most poor Ghanaians can hope for. Education helps increase, rather than decrease, inequality, so primary education for the poor should be designed to provide them with income-earning skills. Developing economic strategies for sustainable poverty reduction will require further research on activities in the informal sector. Another issue that requires investigation is the role of different administrative regions in the determination of household welfare that seems to have changed over the period under study. Findings from such an analysis will facilitate the design of appropriate regional strategies for poverty reduction in Ghana.Poverty Impact Evaluation,Public Health Promotion,Health Systems Development&Reform,Health Economics&Finance,Services&Transfers to Poor,Poverty Assessment,Achieving Shared Growth,Inequality,Rural Poverty Reduction,Services&Transfers to Poor