Querytogether: Enabling entity-centric exploration in multi-device collaborative search

Collaborative and co-located information access is becoming increasingly common. However, fairly little attention has been devoted to the design of ubiquitous computing approaches for spontaneous exploration of large information spaces enabling co-located collaboration. We investigate whether an entity-based user interface provides a solution to support co-located search on heterogeneous devices. We present the design and implementation of QueryTogether, a multi-device collaborative search tool through which entities such as people, documents, and keywords can be used to compose queries that can be shared to a public screen or specific users with easy touch enabled interaction. We conducted mixed-methods user experiments with twenty seven participants (nine groups of three people), to compare the collaborative search with QueryTogether to a baseline adopting established search and collaboration interfaces. Results show that QueryTogether led to more balanced contribution and search engagement. While the overall s-recall in search was similar, in the QueryTogether condition participants found most of the relevant results earlier in the tasks, and for more than half of the queries avoided text entry by manipulating recommended entities. The video analysis demonstrated a more consistent common ground through increased attention to the common screen, and more transitions between collaboration styles. Therefore, this provided a better fit for the spontaneity of ubiquitous scenarios. QueryTogether and the corresponding study demonstrate the importance of entity based interfaces to improve collaboration by facilitating balanced participation, flexibility of collaboration styles and social processing of search entities across conversation and devices. The findings promote a vision of collaborative search support in spontaneous and ubiquitous multi-device settings, and better linking of conversation objects to searchable entities.     

滴水湖无人船测试场应急保障航道规划

针对滴水湖新建无人船测试场的应急保障问题,建立基于Maklink图论和Dijkstra算法的多终点航道规划模型。通过环境建模确定障碍物大小和位置;受PNPoly算法启发,引入剔除函数进行模型改进;利用Dijkstra算法在无向网络图中搜索从起点至终点的最短应急航道,并利用蚁群算法对最短应急航道集合进行优化。结果分析显示,最终规划的航道高效、安全,规划结果可以为滴水湖管理工作和无人船测试场应急保障提供参考。     

Relations between preservice teachers’ self-efficacy,computational thinking skills and metacognitive self-regulation

European Journal of Psychology of Education - Computational thinking skills are thought to have a significant part in almost every area and profession in the future. Yet, there is no sufficient...