Innovation and network multiplexity: R&D and the concurrent effects of two collaboration networks in an emerging economy     

Mariana Giovanna Andrade Rojas  Edgar Rogelio Ramirez Solis  John JianJun Zhu 《Research Policy》2018,47(6):1111-1124

This study focuses on the multiplexity of firm R&D networks, and it investigates two types of boundary-spanning networks: the bipartite network between firms and government-sponsored institutions (GSIs), and the traditional firm–firm network. We apply a social network perspective to examine the effects that these kinds of networks have on firm innovativeness, in relation to the effects of the firm’s internal R&D efforts. We define the firm-GSI network as bipartite, and we investigate how the structural characteristics of this network (cohesion and centrality) affect innovativeness. We then decompose the innovational effects of firm–firm networks into two categories (intra- and inter-sector) to distinguish the effects of these collaboration networks. Furthermore, we investigate how these various external collaborative networks interact with a firm’s internal R&D efforts for driving innovativeness. Our empirical study of 420 manufacturing firms in Mexico evaluates evidence from surveys and secondary data. The findings indicate that the structural properties of both firm–GSI and firm–firm networks have positive effects on innovativeness, but firm–GSI network cohesion has a stronger negative interaction with R&D in influencing firm innovativeness. Moreover, intra-sector centrality in a firm–firm network has a stronger negative interaction with R&D than inter-sector centrality does in driving firm innovativeness. We contribute to the literature by integrating insights from the perspectives of network multiplexity, social embeddedness, and resource complementarity in regard to inter-organizational behavior. Our study also provides meaningful guidelines for both managers and policy makers. The study’s findings are robust to concerns of common method bias and alternative model specifications.  相似文献   

A case of cooperation in the European OR education     

João Miranda  Mariana Nagy 《European Journal of Engineering Education》2011,36(6):571-583

European cooperation is a relevant subject that contributes to building a competitive network of high education institutions. A case of teacher mobility on behalf of the Erasmus programme is presented: it considers some Operations Research topics and the development of the Lego on My Decision module. The module considers eight lecture hours in four sessions: (i) the introductory session, to focus on the basics of computational linear algebra, linear programming, integer programming, with computational support (Excel®); (ii) the interim session, to address modelling subjects in a drop by-session; (iii) the advanced session, on the sequence of (i), to consider uncertainty and also how to use multi-criteria decision-making methods; (iv) the final session, to perform the evaluation of learning outcomes. This cooperation at European level is further exploited, including curricula normalisation and adjustments, cultural exchanges and research lines sharing in the idea of promoting the mobility of students and faculty.  相似文献   

Crosscutting concepts and achievement: Is a sense of size and scale related to achievement in science and mathematics?     

Katherine Chesnutt  M. Gail Jones  Elysa N. Corin  Rebecca Hite  Gina Childers  Mariana P. Perez  Emily Cayton  Megan Ennes 《科学教学研究杂志》2019,56(3):302-321

This study examined the relationship between students' (N = 229) concepts of size and scale and students' achievement in science and mathematics over a 3-year period. Size and scale are considered one of the big ideas in science that permeates disparate science and mathematics content areas, yet little is known about the relationship between students' conceptualization of size and scale and students' achievement in science and mathematics. The study used a modified panel longitudinal design to follow the same class of students over a 3-year period. The goal was to explore whether understandings of size and scale are related to achievement in mathematics and science. Results indicated a strong positive significant relationship existed between students' understanding of size and scale and students' science achievement in grades 5 and 8. There was a positive significant relationship between students' concepts of size and scale and students' mathematics achievement in grades 5, 6, 7, and 8. An examination of the relationships is included as well as a discussion of the integration of crosscutting concepts into science and mathematics instruction as a way to support deep learning.  相似文献   

Toward a More Comprehensive Understanding of Bullying in School Settings     

María Victoria Carrera  Renée DePalma  María Lameiras 《Educational Psychology Review》2011,23(4):479-499

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Geht’s auch mit der Maus? – Eine Methodenstudie zu Online-Befragungen in der Jugendforschung     

Rüdiger Heim  Svenja Konowalczyk  Mariana Grgic  Miriam Seyda  Ulrike Burrmann  Thomas Rauschenbach 《Zeitschrift für Erziehungswissenschaft》2016,19(4):783-805

While internet based surveys have gained importance in recent years, their use in adolescent related research is rare at best. The present paper offers an overview of advantages and disadvantages of online surveys and discusses their use in regard to the questioning of adolescents. In a comparison between two random samples of 13 to 17 year olds, we examine how differences between a telephone (N?= 1,784) and an online (N?= 1,652) survey materialize in regard to the coverage rate, discontinuation behavior, and item-non-response. The sampling is analyzed further with regard to sociodemographic differences. While there are no expected coverage problems for the adolescent target group, the results show that adolescents from educated families, as well as those with a migration background, took part more often in the online survey as opposed to the telephone survey. Also, a more intensive mobile use of the internet, as well as in part greater sports activity, is connected to a higher willingness to take part in the survey which suggests that the survey topic influences the willingness to participate.  相似文献   

The continuous nature of timing reprogramming in an interceptive task     

Teixeira LA  Lima Edos S  Franzoni MM 《Journal of sports sciences》2005,23(9):943-950

The time course of movement timing reprogramming was examined in a task requiring temporal coincidence of the conclusion of a forehand drive with the arrival of a moving luminous target at the end of an electronic trackway. The moving target departed from one end of the trackway at a constant velocity of 2 m (.) s(-1), and for a part of the trials its velocity was increased to 3 m (.) s(-1). Target velocity was modified at different moments during stimulus displacement, producing times-to-arrival after velocity increment (TAVIs) from 100 to 600 ms. The effect of specific practice on movement reprogramming was also examined. The results showed early adjustments to the action (TAVIs = 100 - 200 ms) that seemed to be stereotyped, while feedback-based corrections were implemented only at TAVIs of 300 ms or longer. Temporal accuracy was progressively increased as longer TAVIs were provided up to 600 ms. Skill training led to an overall increment of temporal accuracy, but no effect of specific practice was found. The results indicate that timing reprogramming in interceptive actions is a continuous process limited mainly by intrinsic factors: latency to initiate more effective adjustments to the action, and rate-of-movement timing reprogramming.  相似文献   

Families Learn Together: Reconceptualizing Linguistic Diversity as a Resource     

Mariana Souto-Manning 《Early Childhood Education Journal》2006,33(6):443-446

While a growing number of diverse children are entering U.S. schools, misconceptions remain regarding language acquisition. Analysis of weekly interactions in an urban children’s playgroup in the South reveals how the concept of language diversity as a deficit is still widespread. Mothers of young children still believed that efforts to learn multiple languages diminish a child’s ability to learn other things. Conversely, research points to multilingualism as a resource rather than a deficit. Findings indicate that interactions among mothers and children, mediated by the researcher, combined with observations of one child’s bilingual development allowed mothers and young children to rethink their beliefs regarding linguistic diversity. They began recognizing that bilingualism/multilingualism adds to the lives of all children.  相似文献   

The Principle of Mutual Exclusivity in Word Learning: To Honor or Not to Honor?   总被引：1，自引：0，他引：1  

Terry Kit-fong Au  Mariana Glusman 《Child development》1990,61(5):1474-1490

According to Markman and Wachtel, children assume that nouns pick out mutually exclusive object categories, and so each object should have only one category label. While this assumption can be useful in word learning, it is not entirely reliable. Therefore, children need to learn when to and when not to make this assumption. 6 studies examined whether knowledge about hierarchical organization of categories and about cross-language equivalents for object labels can help children limit their use of this assumption appropriately. These studies revealed that adults as well as children resisted assigning 2 novel names to the same object in some situations. By age 4, children also seemed to know enough about categorization to accept 2 names for an object if the names picked out categories from different levels of a hierarchy (e.g., animal and lemur) but not if they picked out categories from the same level (e.g., lemur and seal). Moreover, monolingual as well as bilingual children seemed to know enough about languages to accept 2 names for the same object if the names clearly came from different languages. Together, these findings suggest that even preschool children can make use of knowledge about language and categorization to fine tune the mutual exclusivity assumption in order to use it effectively in word learning.  相似文献   

Microwave Treatment for Pest Control: Coleoptera Insects in Wooden Objects     

Mariana Patrascu  Mariana Pruna 《文物保护研究》2018,63(3):155-162

By far the most common species of woodworms perceived to be the main cause of damage to wood, and in particular to wooden art objects, are Anobium punctatum de Geer and Hylotrupes bajulas of Coleoptera family. In search of non-chemical methods for eradicating these wood pests, microwave (MW) heating can be an effective tool to help control the insects in their different life stages (eggs, larvae, and adult). The effect of 2.45?GHz frequency MW exposure on wooden art objects is described and discussed. MW heating time is reported in connection with lethal temperature of the pest and moisture content of the treated wooden object. The treatment was carried out using Microwood 12, especially conceived for portability, easy operation, and control. Microwood 12 consists of a switch mode high-voltage power supply and an industrial continuous wave magnetron connected to a rectangular-shaped horn antenna. The measure of temperature and control of operation is done via a built-in infrared thermometer.  相似文献   

How students use their libraries: A case study of four academic libraries     

Irene Lopatovska  Mariana Regalado 《College & Undergraduate Libraries》2016,23(4):381-399

The purpose of this study was to explore the similarities and differences in student behavior in or uses of four academic libraries in the greater New York City area. Using on-site observations and semistructured interviews, the authors collected data about resources and tools used by students as well as their academic and nonacademic activities and contributing factors. Across all four libraries, the study identified that students were actively engaged in academic pursuits utilizing multiple library resources while working with print and digital tools. Students were also observed resting, eating, and engaging in other nonacademic activities. The variations in student behaviors across the four libraries can be explained by contextual variables that influence students' behavior in a library, including student demographics, academic requirements, work habits, and disciplinary affiliations.  相似文献