An equivalence result for VC classes of sets

Let R and θ be infinite sets and let A # R × θ. We show that the class of projections of A onto R is a Vapnik–Chervonenkis (VC) class of sets if and only if the class of projections of A onto θ is a VC class. We illustrate the result in the context of semiparametric estimation of a transformation model. In this application, the VC property is hard to establish for the projection class of interest but easy to establish for the other projection class

Globe: Asian Growth and Trade Poles: India, China, and East and Southeast Asia

Using a global general equilibrium trade model, this study analyzes the impact on developing countries, of (1) the dramatic expansion of trade by India, China, and an integrated East and Southeast (E&SE) Asia trade bloc and (2) productivity growth in the region. China is an integral member of the E&SE Asia bloc, with strong links through value chains and trade in intermediate inputs, while India is not part of any trade bloc. The analyses consider the importance of their different degrees of integration into regional and global economies, focusing on potential complementarities and competition with other developing countries.

Globe: A SAM Based Global CGE Model using GTAP Data

This paper provides a technical description of a global computable general equilibrium (CGE) model that is calibrated from a Social Accounting Matrix (SAM) representation of the Global Trade Analysis Project (GTAP) database. An important feature of the model is the treatment of nominal and real exchange rates and hence the specification of multiple numéraire. Another distinctive feature of the model is the use of a ‘dummy’ region, known as globe, that allows for the recording of inter regional transactions where either the source or destination are not identified.

Pond Management Approaches and Effects on Trophic Dynamics

Mississippi has an abundance of ponds which provides a number of opportunities for anglers. Several enhancement strategies are used to improve fish production in ponds, including fertilizing and supplemental feeding. These strategies may ignore the potential ecological impacts that may unexpectedly arise, such as prolific plant growth. This study consists of two phases; first, a mesocosm experiment investigating fertilizer application rates (mg P/L) in relation to potential sunfish growth, and second, a replicated pond experiment consisting of four treatments to simulate commonly used enhancement strategies. Mesocosm experiment showed a peak of sunfish growth at the 0.6 mg P/L level and served as a high fertilizer threshold level in pond experiment. Ponds were surveyed to assess treatment effects on each trophic level. The costs associated with each pond management strategy were documented. Results from this research help refine management recommendations to maximize results while minimizing costs to landowners and ecosystems

Strategy, Core Competence and HR Involvement as Determinants of HR Effectiveness and Refinery Performance

This study examined the impact strategy, core competence, and involvement of HR executives in strategic decision making on the refinery managers\u27 evaluation of the effectiveness of HR and refinery performance among 86 U.S. petro-chemical refineries. Survey results indicated that higher involvement of HR in organizational strategy was strongly related to perceptions of HR effectiveness, and that the relationship was strongest to the extent that refineries pursued a product innovation strategy and viewed skilled employees as their core competence. HR involvement was unrelated to refinery performance, but was actually negatively related to the extent that refineries emphasized efficient production as their core competence

The Role of Human Resource Practices in Petro-Chemical Refinery Performance

This study examined the impact of Human Resource (HR) practices (selection, training, compensation, and appraisal) and participation on the financial performance of U.S. petrochemical refineries. Survey results from HR and Operations respondents indicated that appraisal and training were significantly related to workforce skills and that training and compensation were marginally related to workforce motivation. In addition, only training was significantly related to refinery performance, although the relationship was negative. However, selection, compensation, and appraisal interacted with participation in determining refinery financial performance such that each of these practices were strongly positively related to financial performance only under highly participative systems. Implications are discussed

Policy Dilemmas in India - The Impact of Changes in Agricultural Prices on Rural and Urban Poverty

Trade policy reforms which lead to changes in world prices of agricultural commodities or domestic policies aimed at affecting agricultural prices are often seen as causing a policy dilemma : a fall in agricultural prices benefits poor urban consumers but hurts poor rural producers, while a rise yields the converse. Poor countries have argued that they need to be able to use import protection and/or price support policies to protect themselves against volatility in world agricultural prices in order to dampen these effects. In this paper, we explore this dilemma in a CGE model of India that uses a new social accounting matrix (SAM) developed at the Indira Ghandi Institute of Development Research (IGIDR) in Mumbai. The SAM includes extensive disaggregation of agricultural activities, commodity markets, labor markets, and rural and urban households. This SAM includes 115 commodities, 48 labor types and 352 types of households, (classified by social group, income class, region, and urban/rural). The CGE model based on this SAM can be used to explore the linkages between changes in world prices of agriculture and the incomes of poor rural and urban households, capturing rural-urban linkages in both commodity and factor markets. The results indicate that the inclusion of linkages between rural and urban labor markets is necessary to fully explore, and potentially eliminate, the dilemma. A fall in agricultural prices hurts agricultural producers, lowers wages and/or employment of rural labor, and in some cases spills over into urban labor markets, depressing wages and incomes of poor urban households as well. In these cases both rural and urban poverty increases. The paper explores the strength of these commodity and factor market linkages, and the potential spillover effects of policies affecting agricultural prices.Doha negotiations, India trade policy, World prices, Labour Market, CGE model

Vascular endothelial growth factor B (VEGF-B) is up-regulated and exogenous VEGF-B is neuroprotective in a culture model of Parkinson's disease

Parkinson's disease (PD) results from the degeneration of dopaminergic neurons in the substantia nigra and the consequent deficit of dopamine released in the striatum. Current oral dopamine replacement or surgical therapies do not address the underlying issue of neurodegeneration, they neither slow nor halt disease. Neurotrophic factors have shown preclinical promise, but the choice of an appropriate growth factor as well as the delivery has proven difficult. In this study, we used a rotenone rat midbrain culture model to identify genes that are changed after addition of the neurotoxin. (1) We challenged rat midbrain cultures with rotenone (20 nM), a pesticide that has been shown to be toxic for dopaminergic neurons and that has been a well-characterized model of PD. A gene chip array analysis demonstrated that several genes were up-regulated after the rotenone treatment. Interestingly transcriptional activation of vascular endothelial growth factor B (VEGF-B) was evident, while vascular endothelial growth factor A (VEGF-A) levels remained unaltered. The results from the gene chip array experiment were verified with real time PCR and semi-quantitative western analysis using β-actin as the internal standard. (2) We have also found evidence that exogenously applied VEGF-B performed as a neuroprotective agent facilitating neuron survival in an even more severe rotenone culture model of PD (40 nM rotenone). VEGF-B has very recently been added to the list of trophic factors that reduce effects of neurodegeneration, as was shown in an in vivo model of motor neuron degeneration, while lacking potential adverse angiogenic activity. The data of an in vivo protective effect on motor neurons taken together with the presented results demonstrate that VEGF-B is a new candidate trophic factor distinct from the GDNF family of trophic factors. VEGF-B is activated by neurodegenerative challenges to the midbrain, and exogenous application of VEGF-B has a neuroprotective effect in a culture model of PD. Strengthening this natural protective response by either adding exogenous VEGF-B or up-regulating the endogenous VEGF-B levels may have the potential to be a disease modifying therapy for PD. We conclude that the growth factor VEGF-B can improve neuronal survival in a culture model of PD