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Associating Semantic Sensor Web with Domain Ontology : The Way to Obtain Meaningful Sensor Data
Chaoqun Ji,Jin Liu,Xiaofeng Wang 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.5
To realize the sharing and reuse of sensor data and improve interoperability, semantic sensor web(SSW)is proposed to add semantics information to existing sensor networksby utilizing domain, spatial and temporal anthologies and other related semantic technology.However these is seldom research on how to fully utilize the sensor data through a semantic way such as domain ontology based inference. This paperpresents stateofthe art of SSWin various aspects,and proposesthe method to associate data from semantic sensor web with domain ontology to realize the communication between different domain ontologies and SSW. In addition, this paperalso proposes a new calculation method of semantic similarity amongdifferent entities in different ontology. Experiments show that this method can effectively find the similar entitiesandrealize the knowledge sharing and ontologies reuse.
Small-signal Impedance Model of an Inductive Power Transfer System Using LCC-LCC Compensation
Chaoqun Qi,Guangce Zheng,Xinlin Wang,Xiaoxuan Ji,Minfan Fu 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
Unregulated inductive power transfer systems are widely adopted for wireless charging scenarios. Such a system is usually cascaded with a dc/dc converter for input or output regulation. The overall system stability needs an in-depth study of the terminal impedance from the small signal perspective. This paper focuses on the impedance model of an LCC-LCC compensated system. An equivalent circuit model is built and used to explicitly derive the input and output impedance. The experiment results show that the model is simple and accurate up to 1/5 of the switching frequency.