Quasi-SLCA based Keyword Query Processing over Probabilistic XML Data

The probabilistic threshold query is one of the most common queries in uncertain databases, where a result satisfying the query must be also with probability meeting the threshold requirement. In this paper, we investigate probabilistic threshold keyword queries (PrTKQ) over XML data, which is not studied before. We first introduce the notion of quasi-SLCA and use it to represent results for a PrTKQ with the consideration of possible world semantics. Then we design a probabilistic inverted (PI) index that can be used to quickly return the qualified answers and filter out the unqualified ones based on our proposed lower/upper bounds. After that, we propose two efficient and comparable algorithms: Baseline Algorithm and PI index-based Algorithm. To accelerate the performance of algorithms, we also utilize probability density function. An empirical study using real and synthetic data sets has verified the effectiveness and the efficiency of our approaches

Adaptive service discovery on service-oriented and spontaneous sensor systems

Service-oriented architecture, Spontaneous networks, Self-organisation, Self-configuration, Sensor systems, Social patternsNatural and man-made disasters can significantly impact both people and environments. Enhanced effect can be achieved through dynamic networking of people, systems and procedures and seamless integration of them to fulfil mission objectives with service-oriented sensor systems. However, the benefits of integration of services will not be realised unless we have a dependable method to discover all required services in dynamic environments. In this paper, we propose an Adaptive and Efficient Peer-to-peer Search (AEPS) approach for dependable service integration on service-oriented architecture based on a number of social behaviour patterns. In the AEPS network, the networked nodes can autonomously support and co-operate with each other in a peer-to-peer (P2P) manner to quickly discover and self-configure any services available on the disaster area and deliver a real-time capability by self-organising themselves in spontaneous groups to provide higher flexibility and adaptability for disaster monitoring and relief

A STUDY OF TEACHERS PERCEPTIONS AND IMPLEMENTATIONS ON THE USE OF MOTIVATIONAL STRATEGIES IN ENGLISH LANGUAGE INSTRUCTION FOR PRIMARY CHILDREN IN HEZHANG COUNTRY SECONDARY SCHOOL IN CHINA

This study was to determine the teacher’s perceptions and frequency of implements on the use of motivational strategies in English language instruction for primary children in Hezhang Country Secondary School in China. There were two research objectives in this thesis:1.To identify the level of the teachers’ perceptions on the use of motivational strategies in English language instruction according to the ten strategy clusters.2.To identify the frequency of the teachers’ implementations on the use of motivational strategies in English language instruction according the ten strategy clusters.There were 61 primary English teachers at Hezhang country Secondary Primary School, Guizhou, China participated in this study. The research instruments used questionnaire and structured interview form.The findings showed that (1) the level of the teachers perceptions on the use of motivational strategies in English language instruction according to the ten strategy clusters was high and (2) the frequency of the teachers implementations was also high. All findings were supported by interview form. It indicated that teachers most think that the use of the motivational strategies in English language instruction were important and they mostly implement them in the English teaching. This research study has offered useful suggestions and recommendations on the motivational strategies for this school