Bolong Zheng

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Driven by the advances in location positioning techniques and the popularity of location sharing services, semantic enriched trajectory data have become unprecedentedly available. While finding relevant Point-of-Interest (POIs) based on users' locations and query keywords has been extensively studied in the past years, it is largely untouched to explore the(More)
Conventional top-k spatial keyword queries require users to explicitly specify their preferences between spatial proximity and keyword relevance. In this work we investigate how to eliminate this requirement by enhancing the conventional queries with interaction, resulting in Interactive Top-k Spatial Keyword (ITkSK) query. Having confirmed the feasibility(More)
The last decade has witnessed the prevalence of sensor and GPS technologies that produce a high volume of trajectory data representing the motion history of moving objects. However some characteristics of trajectories such as variable lengths and asynchronous sampling rates make it difficult to fit into traditional database systems that are disk-based and(More)
Understanding the dynamics of human daily mobility patterns is essential for the management and planning of urban facilities and services. Travel smart cards, which record users' public transporting histories, capture rich information of users' mobility pattern. This provides the opportunity to discover valuable knowledge from these transaction records. In(More)
It is nowadays quite common for road networks to have textual contents on the vertices, which describe auxiliary information (e.g., business, traffic, etc.) associated with the vertex. In such road networks, which are modelled as weighted undirected graphs, each vertex is associated with one or more keywords, and each edge is assigned with a weight, which(More)
The efficiency of spatial query processing is crucial for many applications such as location-based services. In spatial networks, queries like k-NN queries are all based on network distance evaluation. Classic solutions for these queries rely on network expansion and are not efficient enough for large networks. Some approaches have improved the query(More)
STUDY DESIGN Case report and review of relevant literature. OBJECTIVE To discuss the surgical strategies and clinical outcome of managing huge tear drop fracture of axis. SUMMARY OF BACKGROUND DATA Teardrop fracture of axis is rarely seen, especially the huge type. The surgical technique is demanding because of the special anatomical structure and(More)
In this paper, we study a route summarization framework for Personalized Navigation dubbed PerNav - with which the goal is to generate more intuitive and customized turn-by-turn directions based on user generated content. The turn-by-turn directions provided in the existing navigation applications are exclusively derived from underlying road network(More)
The previous studies have shown that melatonin is beneficial for nervous system after spinal cord injury (SCI). After SCI, the endogenous neural stem/progenitor cells (eNSPCs) proliferate and differentiate into neurons and glial cells. In the present study, we examined the effect of melatonin on eNSPCs proliferation and differentiation in SCI rat model. SCI(More)
Route recommendation is one of the most widely used location-based services nowadays, as it is vital for nice-driving experience and smooth public traffic. Given a pair of user-specified origin and destination, a route recommendation service aims to provide users with the routes of the best travelling experience according to given criteria. However, even(More)