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Along with the growing of the aging population and the necessity of efficient wellness systems, there is a mounting demand for new technological solutions able to support remote and proactive healthcare. An answer to this need could be provided by the joint use of the emerging Radio Frequency Identification (RFID) technologies and advanced software choices. This paper presents a proposal for a context-aware infrastructure for ubiquitous and pervasive monitoring of heterogeneous healthcare-related scenarios, fed by RFID-based wireless sensors nodes. The software framework is based on a general purpose architecture exploiting three key implementation choices: ontology representation, multi-agent paradigm and rule-based logic. From the hardware point of view, the sensing and gathering of context-data is demanded to a new Enhanced RFID Sensor-Tag. This new device, de facto, makes possible the easy integration between RFID and generic sensors, guaranteeing flexibility and preserving the benefits in terms of simplicity of use and low cost of UHF RFID technology. The system is very efficient and versatile and its customization to new scenarios requires a very reduced effort, substantially limited to the update/extension of the ontology codification. Its effectiveness is demonstrated by reporting both customization effort and performance results obtained from validation in two different healthcare monitoring contexts.

at f 03 ¼ 2.44 GHz with 3-dB bandwidth of 130 MHz in range of 2380-2510 MHz. The insertion loss is 3.56 dB and return loss is 18.6 dB.These results are in a good agreement with third band of GSM too.For better illustration, measurement results of three outputs of fabricated triplexer are shown in Figure 12.The isolation among the three passband is better than À50 dB, as shown in Figure 13. CONCLUSIONSA novel matching circuit is proposed, which is based on SIRs with four different impedance characteristics. A triplexer designed and fabricated, which is operating in three frequency ranges in GSM by using these matching circuits.The proposed matching circuit caused the insertion loss of each filter to decrease greatly in addition to avoiding power reflection to the input of the triplexer. Each filter of the triplexer has several unwanted spurious resonances in the stopband. Using the proposed matching circuit improved spurious resonances, which interfere the operation frequency bands in GSM. The proposed triplexer is fabricated and carefully examined. ABSTRACT: In this article we adopt the graphical processing units as a low-cost and efficient solution of challenging electromagnetic numerical problems. Based on the compute unified device architecture, an optimized method of moments algorithm has been implemented which adopts direct solvers based on LU decomposition. Numerical results obtained on the practical case of a patch antenna analysis demonstrate the high performance of the approach.