Project Team Perception of Causes of Building Cost Overruns： A Reflection in Tanzania

The paper provides an empirical insight into the significance of shared cognition reflected in the perception of key actors in selected construction projects. It has explored how clients, consultants and contractors prioritize causes of cost overrun in building projects in Tanzania and measured the statistical variance in their order of rank. A total of 55 respondents were selected from public projects that had experienced cost overruns. The results show an inclination of the top 4 causes of cost overrun being technical and originate from internal sources. The Spearman correlation coefficient established a strong positive correlation in the ranking of causes of cost overrun in construction project by clients, consultants and contractors, suggesting a shared cognition is in place for the project team. The outcome provides a good base for contemplating success of mitigation measures for cost overruns and reiterates the significance for a shared cognition for project team success.

Current Status and Evolution of Shared Mental Models Based on Bibliometric Analysis

The cornerstone of most management research revolves around improving productivity and team performance.A crucial factor influencing team performance is the shared mental model that team members hold regarding task and team member related issues.This concept has garnered increasing attention from scholars,resulting in an abundance of literature.However,there remains a noticeable scarcity of a comprehensive literature review that combines both quantitative and qualitative analyses of shared mental model studies.In order to grasp a comprehensive understanding of the current status and future trends in the area,this study employs a bibliometric approach to review the literature on shared mental models published in the Web of Science Core Collection database from 1992 to 2023.Co-citation analysis is employed to thoroughly scrutinize the structure of this research area,computationally highlighting research hotspots,revealing potential future research directions and applications,as well as pinpointing pivotal turning points and landmarks in the field.Through scientific bibliometric analysis of knowledge structures and emerging trends,this review makes a substantial contribution to the contemporary literature on shared mental models,providing valuable insights for researchers and practitioners in the field.

Unlicensed Spectrum Sharing Game Between LEO Satellites and Terrestrial Cognitive Radio Networks

By cognitive radio,the low Earth orbit（LEO） satellites may prefer to operate in the unlicensed spectrum which is open to all the users,and compete for the limited resources with terrestrial cognitive radio networks（CRNs）.The competition can be regarded as a game and analyzed with game theory.This particular unlicensed spectrum sharing problem is modeled here,and the special properties of ＂spatially-distinguished-interference＂ and the short period of the interactions between satellites and terrestrial CRNs are explored.Then,the problem is formulated as a ＂partially-blind＂ finitely repeated prisoner＇s dilemma by game theory.Finally,we begin with two promising spectrum sharing schemes,which can be used to enforce the frequency reuse among the remotely located terrestrial CRN players as well as to overcome the observation noise.By analysis and comparison,it is proposed that the novel refreshing-contrite-tit-for-tat（R-CTFT） is the optimal spectrum sharing scheme.Simulation results verify that it can be used to utilize the spectrum most efficiently.