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排序方式: 共有137条查询结果,搜索用时 31 毫秒
1.
In this article, we attempt to extend and nuance the debate on intellectual property (IP) strategy, appropriation, and open innovation in dynamic and systemic innovation contexts. We present the case of four generations of mobile telecommunications systems (covering the period 1980–2015), and describe and analyze the co-evolution of strategic IP management and innovation ecosystems. Throughout this development, technologies and technological relationships were governed with different and shifting degrees of formality. Simultaneously, firms differentiated technology accessibility across actors and technologies to benefit from openness and appropriation of innovation. Our analysis shows that the discussion of competitiveness and appropriability needs to be expanded from the focal appropriability regime and complementary assets to the larger context of the innovation ecosystem and its cooperative and competitive actor relations, with dispersed complementary and substitute assets and technologies. Consequently, the shaping of complementary and substitute appropriability regimes is central when strategizing in dynamic and systemic innovation contexts. This holds important implications for the management of open innovation, innovation ecosystems, platforms, and coopetition. 相似文献
2.
We use a quantitative model to study the implications of European integration for welfare and net migration flows across 1,280 European regions. The model suggests that an increase of trade barriers to the level of 1957 reduces welfare by about 5%–8% on average, depending on the presumed trade elasticity. However, remote regions may face initial welfare losses of up to 10%. These heterogeneous welfare effects cause estimated net migration of 1.9% of the population to the European geographic center implying that the dismantling of trade barriers in Europe has led to a more homogeneous spatial distribution of economic activity. With regard to the Brexit, we find moderate welfare losses for the United Kingdom of 1.05% in the most pessimistic scenario while continental Europe's welfare declines by 0.41%. (JEL F15, R12, R13, R23) 相似文献
3.
Antnio J. Santos Joo R. Daniel Marta Antunes Gabrielle Coppola Marcel Trudel Brian E. Vaughn 《Social Development》2020,29(2):544-563
To test the hypothesis that social engagement is a foundational aspect of other peer social competence indicators during early childhood, 160 Portuguese preschool children (“3‐year‐olds”) were observed at least in two different school years, using a battery of validated social competence assessments based on direct observations and child interviews. Multilevel growth models tested whether social engagement predicted initial values and linear changes in the other social competence indicators. Results were consistent with the hypothesis, insofar as both initial values and changes in social engagement significantly predicted initial values and changes in other social competence indicators. Additionally, the number of children's reciprocated friendships was also predicted by social engagement. These results are discussed from the perspectives of conceptual frameworks that consider individual differences in social competence during early childhood as a consequence of attachment histories and/or emotional competence. 相似文献
4.
Björn Bornkamp Kaspar Rufibach Jianchang Lin Yi Liu Devan V. Mehrotra Satrajit Roychoudhury Heinz Schmidli Yue Shentu Marcel Wolbers 《Pharmaceutical statistics》2021,20(4):737-751
A randomized trial allows estimation of the causal effect of an intervention compared to a control in the overall population and in subpopulations defined by baseline characteristics. Often, however, clinical questions also arise regarding the treatment effect in subpopulations of patients, which would experience clinical or disease related events post-randomization. Events that occur after treatment initiation and potentially affect the interpretation or the existence of the measurements are called intercurrent events in the ICH E9(R1) guideline. If the intercurrent event is a consequence of treatment, randomization alone is no longer sufficient to meaningfully estimate the treatment effect. Analyses comparing the subgroups of patients without the intercurrent events for intervention and control will not estimate a causal effect. This is well known, but post-hoc analyses of this kind are commonly performed in drug development. An alternative approach is the principal stratum strategy, which classifies subjects according to their potential occurrence of an intercurrent event on both study arms. We illustrate with examples that questions formulated through principal strata occur naturally in drug development and argue that approaching these questions with the ICH E9(R1) estimand framework has the potential to lead to more transparent assumptions as well as more adequate analyses and conclusions. In addition, we provide an overview of assumptions required for estimation of effects in principal strata. Most of these assumptions are unverifiable and should hence be based on solid scientific understanding. Sensitivity analyses are needed to assess robustness of conclusions. 相似文献
5.
The numerical control of an experimental assembly cell with two robots--termed a cognitive control unit (CCU)--is able to simulate human information processing at a rule-based level of cognitive control. To enable the CCU to work on a large range of assembly tasks expected of a human operator, the cognitive architecture SOAR is used. The CCU can plan assembly processes autonomously and react to ad-hoc changes in assembly sequences effectively. Extensive simulation studies have shown that cognitive automation based on SOAR is especially suitable for random parts supply, which reduces planning effort in logistics. Conversely, a disproportional increase in processing time was observed for deterministic parts supply, especially for assemblies containing large numbers of identical parts. In this contribution, the effect of phase-shifts in deterministic part supply is investigated for assemblies containing maximal different parts. It can be shown that the concept of cognitive automation is as well suitable for these planning problems. 相似文献
6.
Marloes de Lange Maarten H. J. Wolbers Maurice Gesthuizen Wout C. Ultee 《Revue europeenne de demographie》2014,30(2):161-185
In this paper, we study the impact of macro- and micro-economic uncertainty on family formation between 1970 and 2000 in The Netherlands. Using data of the Family Survey Dutch Population, we analysed the monthly hazard rates of experiencing the transition into first union, first marriage and parenthood after the start of the relationship of 365 male and 364 female partners by applying piecewise-constant exponential models. The results show that macro-economic uncertainties, i.e. high unemployment rates, lead to postponement of the first union and marriage, but not of the first child. In addition, we found that this relationship is not interpreted by individual-level employment insecurity, i.e. temporary employment or unemployment, which does not seem to prevent people from making long-term family commitments. Although hypothesized, we did not find that the negative effects of macro- and micro-level insecurities on family formation reinforce each other or that they vary between individuals with different educational qualifications. 相似文献
7.
Astrid M. G. Poorthuis Sander Thomaes Marcel A. G. van Aken Jaap J. A. Denissen Bram Orobio de Castro 《Social Development》2014,23(4):770-783
The transition from primary to secondary school challenges children's psychological well‐being. A cross‐transitional longitudinal study (N = 306; mean age = 12.2 years) examined why some children's self‐esteem decreases across the transition whereas other children's self‐esteem does not. Children's expected social acceptance in secondary school was measured before the transition; their actually perceived social acceptance was measured after the transition. Self‐esteem and Big Five personality traits were measured both pre‐ and posttransition. Self‐esteem changed as a function of the discrepancy between children's expected and actually perceived social acceptance. Furthermore, neuroticism magnified self‐esteem decreases when children's ‘hopes were dashed'—when they experienced disappointing levels of social acceptance. These findings provide longitudinal support for sociometer theory across the critical transition to secondary school. 相似文献
8.
Intersectional Individuality: Georg Simmel's Concept of “The Intersection of Social Circles” and the Emancipation of Women 下载免费PDF全文
Marcel Stoetzler 《Sociological inquiry》2016,86(2):216-240
Georg Simmel's “The intersection of social circles,” a chapter in his 1908 Sociology, contains discussions of class, religion, ethnic, and gender relations that are highly relevant to contemporary sociological concerns. Simmel's argument is based on a notion of historical dynamic that interprets increasingly complex intersectionality as a sign of progressing civilization. The article establishes how Simmel describes “the intersection of social circles” and then looks at Simmel's account through the concept of “intersectionality” as developed in contemporary feminist theory. The article suggests that although some aspects of Simmel's account of women in modernity are incompatible with contemporary feminism, the shared use of the same image, “intersection,” in Simmel and in contemporary feminist theory is the symptom of a shared concern with a particular aspect of the complexity of modern society. In Simmel, the increasing density of the intersections of social circles points to the increasingly complex individuality of modern subjects, whereas the use of the same image in contemporary feminist theory is part of a critique of inequality and oppression in the same modern society whose advent Simmel celebrated. Intersectionality is a characteristic of modern society that first became visible more than a century ago and has meanwhile become ever the more a signature of modernity. 相似文献
9.
10.
We show that the capability approach can greatly facilitate ex ante policy evaluations, in particular those that are geared towards multiple goals. It enables a structured discussion on policy benefits, distributional issues, freedom and ethics. We illustrate our general ideas with a real-world application: the impact assessment of an EU-proposal on organ donation. 相似文献