170,686 research outputs found
The impact of cultural diversity on firm innovation: evidence from Dutch micro-data
No full textAn important question for firms and policy makers is whether the recruitment of foreign workers can boost innovation. Migration studies have demonstrated positive economic impacts of cultural diversity on productivity and innovation at the regional level, but the impacts at firm level are less well known. Merging data from four different sources, provided by Statistics Netherlands, we construct and analyze a unique linked employer-employee micro dataset of 4582 firms that includes qualitative information on firm innovation. We consider both the number of immigrants these firms employ and their cultural diversity. Potential endogeneity of migrant employment is addressed by an instrumental variables approach that accounts for the past geographic distribution of immigrants and the past culinary diversity of the municipality the firm is located in. We find robust evidence that firms employing relatively more migrants are less innovative. However, there is evidence of integration in that this effect is generally less strong or even absent for second generation immigrants. Moreover, firms employing a more diverse foreign workforce are more innovative, particularly in terms of product innovations. The benefits of diversity for innovation are more apparent in sectors employing relatively more skilled immigrants
Impacts of immigration and cultural diversity on innovation and economic growth
No full textNijkamp, P. [Promotor]Poot, H.J. [Promotor
Walking the Dog - a motive for daily walks, illustrated for the urban park and Nature 2000 area Bosjes van Poot (city of The Hague, the Netherlands)
No full text
Individual cybercrime offenders
No full textWeulen Kranenbarg, M., Laan, A. van der, Poot, C. de, Verhoeven, M., Wagen, W. van der, Weijters, G. (2017). Individual Cybercrime Offenders. In E.R. Leukfeldt (Ed.), Research Agenda: The Human Factor in Cybercrime and Cybersecurity. Den Haag: Eleven International Publishing
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Immigration and Innovation in European Regions
No full textThe pooling of people with diverse backgrounds in particular areas may boost the creation of new ideas, knowledge spillovers, entrepreneurship and economic growth. In this paper we measure the impact of the size, skills and diversity of immigration on innovativeness of host regions. For this purpose we construct a panel of data on 170 regions in Europe (NUTS 2 level) for the period 1991-2001. Innovation outcomes are measured by means of the number and types of patent applications. Given the geographical concentration and subsequent diffusion of innovation activity, and the spatial selectivity of immigrant settlement patterns, we take account of spatial dependence and of endogeneity of immigrant settlement in the econometric modelling. We find that an increase in patent applications in a region is associated with (i) net immigration; (ii) the share of foreigners in the population of the region; (iii) the average skill level of the immigrants; and (iv) the cultural diversity of the immigrants. The magnitude of these effects varies between types of patents
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
A Spatial Econometric Analysis of Selected Local Labour Market Outcomes in New Zealand
No full textThis thesis analyses several aspects of local labour market performance in New Zealand. Each of these aspects represents a different feature of the local labour market that together aim to provide a comprehensive understanding of how local labour markets respond to local or external shocks, taking spatial dependencies into account. The first aspect considered is the change in regional employment outcomes in New Zealand from the 1980’s to 2006. This is examined using shiftshare techniques supplemented by exploratory spatial data analysis. The analysis finds that in general, region specific factors were more important than industry structure in explaining total employment change in a region and that productivity and/or demand shocks spill over between regions. The relationship between homeownership and unemployment is the second aspect considered. Particularly, Oswald has argued that disparities in unemployment rates maybe attributable to differences in homeownership rates, higher homeownership rates being associated with higher unemployment rates. Using spatial panel models this claim is supported in the New Zealand context. The spatial estimation strategy adopted yields parameter estimates significantly lower than the standard fixed effects model. This indicates that in the non-spatial models some of the variation in regional unemployment rates has been incorrectly attributed to the explanatory variables rather than to the presence of some spatial spillover effects of unemployment across regions. Thirdly, the thesis investigates the extent to which the spatial-temporal variation in local labour market outcomes and social security benefit uptake can be linked to the composition of the local labour force. This is investigated using spatial seemingly unrelated regression. The results indicate that three factors in particular matter in the determination of labour market participation and social security benefit uptake: the age structure of the population, the past performance of the regional labour market and the proportion of solo parents. Lastly a simultaneous equations growth model of real income, population, land rent and public infrastructure investment is developed that allows the impact of local authority infrastructure spending in New Zealand to be assessed for the 1996-2006 period. The results of the estimation of this system of equations, using a spatial three stage least squares (3SLS) procedure, show that an increase in local infrastructure spending increases population growth, real income and land values, but is itself endogenous and spatially correlated
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