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Mobile and other PDA devices allow us to access the World Wide Web anytime and anywhere. Developing dynamic web based applications for mobile devices is a challenging task, because these devices have limited computational resource such as CPU and Physical Memory. In order to overcome these limitations, we proposed layered architecture for the devel...
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Son yıllarda mikroelektronik alanında hızlı gelişmeler yaşanmış ve bu gelişmeler modern yaşamı oldukça etkilemiştir. Bu gelişmelerin yanı sıra, mikroelektronik elemanların performansının da iyileştirilmesine ihtiyaç vardır. Mikroelektronik cihazların bozulmasında veya yanlış sinyaller üretilmesinde en önemli problem sıcaklıktır. Piezoelektrik fanlar, mikroelektronik sistemlerin ısı transferi için yenilikçi bir çözümdür. Bu fanlar, ters piezoelektrik etkiyi kullanarak elektrik enerjisini titreşime dönüştürür. Böylece kanatların titreşimi ile ısı iletim hızı artmaktadır. Bu çalışmada, piezoelektrik aktüatörlere sahip on bir kanatlı bir fanın titreşim performansını etkileyen elektro-mekanik faktörler nümerik olarak incelenmiştir. Titreşim modu ile ısı iletim hızı arasında doğrusal bir ilişki olduğu görülmüştür. Sonuç olarak, öncelikle piezoelektrik aktüatör kalınlığı ile yer değiştirme arasında negatif bir korelasyon tespit edilmiştir. İkinci olarak, frekans ve yer değiştirme arasındaki negatif korelasyon ve gerilim ile yer değiştirme arasında pozitif korelasyon elde edilmiştir. Son olarak da 100 μm, 100 V ve 5 Hz'de maksimum yer değiştirmenin 77,25 μm olduğu tespit edilmiştir.
Context awareness is one area that can be explored in developing mobile health (mHealth) application. Context refers to items such as user location, time, environment etc. applications can provide better services to the user by taking this information into consideration. One of the major challenges in developing context aware mHealth application is to store and process raw context data. This paper proposes ontology based model for the management of context data in proposed mHealth application. Ontology based model was compared with other competing models in literature for its suitability in developing mHealth application. Furthermore preliminary design details of proposed mHealth application are also provided.
