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Geographic clusters confer advantages to collocated firms, in particular access to local know-how. This article argues that the access to local know-how is contingent on the extent to which inventive activity is concentrated in the cluster. We draw on sociological theories of generalized exchange to argue that contrasting logics of exchange emerge in geographic clusters that have opposing effects on the extent to which firms benefit from collaborating with local organizations and source local knowledge. A longitudinal data set of 1903 firms engaged in nanotechnology research is used to examine the relationship between firm co-authorships on scientific articles with firms and public research organizations (PROs) and firm inventive performance. Results indicate that when cluster-level firm inventive concentration is high, collaborations with local firms are associated with lower inventive performance. We also find that firms source less local knowledge for their own inventions when firm inventive concentration is high. In contrast, concentrated inventive activity among PROs increases the positive relationship between collaborations with local PROs and firm inventive performance. Results also show firms source more knowledge from local PROs when local PRO inventive concentration is high. The findings suggest that inventive concentration both helps and hinders spill-over of cutting-edge knowledge. 相似文献
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D G Schwartz 《Medical reference services quarterly》1987,6(4):27-33
Over the course of the next twenty years libraries will be undergoing significant retooling so that they can move beyond their traditional roles and become the manager of the medical center's information network. As libraries automatic, the role of the medical librarian will change. To manage the change with ease librarians must begin now to equip themselves, their libraries and their clientele to function effectively in the new environment. Developing formalized instructional programs that link individuals to information and to systems that provide those individuals with personal memory extenders and lifelong learning supports will be among the librarian's top priorities. 相似文献
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Schwartz MW 《Medical reference services quarterly》2000,19(2):81-89
Hospital librarians in Naval Medical Centers and Naval Hospitals provide information to support the physicians, nurses, psychologists, chaplains, dentists, and corpsmen on ships and on Navy bases worldwide. The concept of "operational readiness" refers to the training required by Navy personnel during peacetime to perform war-time missons. Navy medical librarians receive challenging requests. Providing information electronically through full text, electronic main, and fax, is part of the routine when preparing staff to deploy to other countries and when supporting them in the field and on ships. Librarians at Naval Medical Center, San Diego help prepare Navy Healthcare providers for operations during combat, humanitarian, and peacekeeper missions. This paper describes several Navy medical field operations with brief explanations of medical librarians' support. 相似文献