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121.
Saavedra-Robinson L Quintana LA Fortunato Leal LD Niño M 《Work (Reading, Mass.)》2012,41(Z1):1639-1646
Factors related to the height of the load and the frequency of handling have become a way to predict the acceptable standard weight lifted for workers whose main task is the manual lifting of materials and measuring the conditions is important to determine a maximum weight lifted. This study was conducted to twenty (20) workers between eighteen (18) and forty (40) years old with a minimum six months experience and belonging to the warehouse and packaging area of a dairy products company. Consideration was given to three different heights such as knuckle, shoulder and total height as well as frequencies of 2, 4 and 6 times per minute. Average values for lifted weight were 17.9306 ± 2.37 kg. The conclusions and recommendations included a review of legislation related to Colombian maximum acceptable weight of lifting due to the current law does not match the acceptable weight handled in this research. 相似文献
122.
Automotive sound systems vary widely in terms of functions and way of use between different brands and models what can bring difficulties and lack of consistency to the user. This study aimed to analyze the usability of car stereo commonly found in the market. Four products were analyzed by task analysis and after use reports and the results indicate serious usability issues with respect to the form of operation, organization, clarity and quality of information, visibility and readability, among others. 相似文献
123.
José Luis Molina Hugo Valenzuela-García Miranda J. Lubbers Paula Escribano Marta M. Lobato 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2018,29(4):725-739
In order to contribute to the debate about social entrepreneurship, we take an empirical perspective and describe the phenomenon in Catalonia, Spain, during the financial crises of the early twenty-first century. For this aim, we conducted 43 in-depth interviews with social entrepreneurs, launched a web-based survey with 90 responses, and built a database with 347 organizations and/or ventures settled in Catalonia with an explicit social/environmental goal. The data show that many social/environmental initiatives emerged during the economic crisis, either as a self-employment alternative to unemployment, or as a commercial venture started by nonprofit organizations as a reaction to the reduction in public expense in this sector. In addition, the crisis fueled the emergence of ventures oriented to non-market exchange and social currencies. As a whole, we argue that this new reality can be conceptualized as the emergence of an unsettled Strategic Action Field where banks, business schools and public administrations alike promote the label of “social entrepreneurship” through awards and startup services, whereas other groups claiming the same social/environmental goals contest this market-oriented definition of the field. 相似文献
124.
There is a general consensus that homeownership has beneficial effects for both individuals and society in many outcomes. However, research regarding the effect of homeownership on individuals’ subjective well-being remains inconclusive. In this paper, for the first time, we provide empirical evidence for the link between homeownership and housing satisfaction using panel data. We use the eight waves of the European Community Household Panel (ECHP) covering the period 1994–2001. We observe that renters who become homeowners not only experience a significant increase in housing satisfaction, but also after changing their tenure status, they obtain a different utility from the same housing context. This evidence might provide support to the hypothesis that a share of the differences in the perceived utility derived from housing can be attributed to (un)fulfilled expectations or aspirations regarding homeownership. 相似文献
125.
In this paper we examined the determinants of child care choices among families with young children in Spain, by means of
a conceptual framework that encompassed need, costs, and availability. Based on data from the Spanish Time Use Survey and
Household Budget Survey, our study indicated that, regardless of model specification, the age of the child, the mother’s labor
force decisions, and the prices of child care services available were the most important factors that mothers considered when
they chose a type of child care. Day care center services substituted for babysitters when the price of babysitters rose;
and relative and parent care substituted for day care centers when these services became more expensive. We found no different
sensitivity to price changes for working and non-working mothers. From a public policy perspective, child care price subsidies
were found to have much stronger effects on child care decisions than child allowances or public provision of school slots. 相似文献
126.
127.
We present a local density estimator based on first-order statistics. To estimate the density at a point, x, the original sample is divided into subsets and the average minimum sample distance to x over all such subsets is used to define the density estimate at x. The tuning parameter is thus the number of subsets instead of the typical bandwidth of kernel or histogram-based density estimators. The proposed method is similar to nearest-neighbor density estimators but it provides smoother estimates. We derive the asymptotic distribution of this minimum sample distance statistic to study globally optimal values for the number and size of the subsets. Simulations are used to illustrate and compare the convergence properties of the estimator. The results show that the method provides good estimates of a wide variety of densities without changes of the tuning parameter, and that it offers competitive convergence performance. 相似文献
128.
Despite well documented high levels of socioeconomic inequalities, health gradients by socioeconomic status (SES) in contemporary China have been reported to be limited. Using data from the 2010–2012 China Family Panel Studies, we reexamine associations between three sets of SES—human capital, material conditions, and political capital—and self-rated health among Chinese adults 18–70 years old, capitalizing on anchoring vignette data to adjust for reporting heterogeneity. We find strong evidence of substantial variations in reporting behaviors by education, cognition, and family wealth but not by family income or political capital. Failing to correct for reporting heterogeneity can bias the estimates of SES gradients in self-rated health as much as nearly 40 %. After vignette adjustment, we find significantly positive associations of education, family income, wealth, and political capital with self-rated health. Individuals’ cognitive capacity, however, does not predict self-rated health. 相似文献
129.
ESTIMATING MARKET POWER IN HOMOGENOUS PRODUCT MARKETS USING A COMPOSED ERROR MODEL: APPLICATION TO THE CALIFORNIA ELECTRICITY MARKET 下载免费PDF全文
This study proposes a novel econometric approach to estimating market power in homogenous product markets. We use a composed error model to estimate the stochastic part of firms' strategic pricing equation. This part is formed by two random variables: a traditional error term, which captures random shocks, and a random conduct term, which measures the degree of market power. This approach allows for the conduct parameter to vary flexibly across firms and within firms over time, and avoids ad hoc structural restrictions for identifying firms' conduct. The empirical application of our approach is based on a well‐known California wholesale electricity market data set, which has been rigorously used to study market power. Our results suggest that realization of market power varies over both time and firms, and reject the assumption of a common or time‐invariant conduct parameter. (JEL C34, C51, L13, L94) 相似文献
130.