Core–periphery structures in national higher education systems. A cross-country analysis using interlinking data

This paper presents a comparative analysis of the structure of national higher education networks in six European countries using interlinking data. We show that national HE systems display a common core–periphery structure, which we explain by the lasting reputational differences in science, as well as the process of expansion and integration of HE systems. Furthermore, we demonstrate that centrality in national networks (coreness) is associated with organizational characteristics, reflecting that interlinking is motivated by access to resources and the status of the organizations concerned, and that national policies impact network structures by influencing the level of inequality in the distribution of resources and status. Finally, we show that, as an outcome of the core–periphery structure, the strength of ties between two HEIs is largely determined by their individual coreness, while the impact of distance is too small-scale to alter the network structure generated by organizational attributes.     

A learning approach to optimizing exploration–exploitation tradeoff in relevance feedback

Relevance feedback is an effective technique for improving search accuracy in interactive information retrieval. In this paper, we study an interesting optimization problem in interactive feedback that aims at optimizing the tradeoff between presenting search results with the highest immediate utility to a user (but not necessarily most useful for collecting feedback information) and presenting search results with the best potential for collecting useful feedback information (but not necessarily the most useful documents from a user’s perspective). Optimizing such an exploration–exploitation tradeoff is key to the optimization of the overall utility of relevance feedback to a user in the entire session of relevance feedback. We formally frame this tradeoff as a problem of optimizing the diversification of search results since relevance judgments on more diversified results have been shown to be more useful for relevance feedback. We propose a machine learning approach to adaptively optimizing the diversification of search results for each query so as to optimize the overall utility in an entire session. Experiment results on three representative retrieval test collections show that the proposed learning approach can effectively optimize the exploration–exploitation tradeoff and outperforms the traditional relevance feedback approach which only does exploitation without exploration.     

The development of recordkeeping systems in the British Empire and Commonwealth, 1870s–1960s

¹ 1. Use of the term ‘recordkeeping’ should not be taken as an endorsement of the Records Continuum as elaborated by Frank Upward and his collaborators. View all notesThis essay demonstrates that initiatives in the imperial periphery, not least in Western Australia, played a significant role in the development of recordkeeping systems in the British Empire and Commonwealth. Local circumstances, including the adequacy of local revenues and the availability of skilled staff, played their part in shaping the systems. Nonetheless, there are overarching patterns. The need to maintain security provided a potent driver for the creation of confidential registries. The need to carry out basic functions influenced the design of recordkeeping systems far more than any shared ‘imperial imaginary’. The diverging work patterns of colonial capitals and of district administrations tended to produce distinct recordkeeping systems. The development of integrated registry systems may have played a part in the development of the Secretariat as an institution of colonial government.