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Pub/Sub-based Sensor virtualization framework for Cloud environment
Mohammad Hasmat Ullah,Sung-Soon Park,Jaechun No,Gyeong Hun Kim 한국인터넷방송통신학회 2015 Journal of Advanced Smart Convergence Vol.4 No.2
The interaction between wireless sensors such as Internet of Things (IoT) and Cloud is a new paradigm of communication virtualization to overcome resource and efficiency restriction. Cloud computing provides unlimited platform, resources, services and also covers almost every area of computing. On the other hand, Wireless Sensor Networks (WSN) has gained attention for their potential supports and attractive solutions such as IoT, environment monitoring, healthcare, military, critical infrastructure monitoring, home and industrial automation, transportation, business, etc. Besides, our virtual groups and social networks are in main role of information sharing. However, this sensor network lacks resource, storage capacity and computational power along with extensibility, fault-tolerance, reliability and openness. These data are not available to community groups or cloud environment for general purpose research or utilization yet. If we reduce the gap between real and virtual world by adding this WSN driven data to cloud environment and virtual communities, then it can gain a remarkable attention from all over, along with giving us the benefit in various sectors. We have proposed a Pub/Sub-based sensor virtualization framework Cloud environment. This integration provides resource, service, and storage with sensor driven data to the community. We have virtualized physical sensors as virtual sensors on cloud computing, while this middleware and virtual sensors are provisioned automatically to end users whenever they required. Our architecture provides service to end users without being concerned about its implementation details. Furthermore, we have proposed an efficient content-based event matching algorithm to analyze subscriptions and to publish proper contents in a cost-effective manner. We have evaluated our algorithm which shows better performance while comparing to that of previously proposed algorithms.
Pub/Sub-based Sensor virtualization framework for Cloud environment
Ullah, Mohammad Hasmat,Park, Sung-Soon,Nob, Jaechun,Kim, Gyeong Hun The Institute of Internet 2015 International journal of advanced smart convergenc Vol.4 No.2
The interaction between wireless sensors such as Internet of Things (IoT) and Cloud is a new paradigm of communication virtualization to overcome resource and efficiency restriction. Cloud computing provides unlimited platform, resources, services and also covers almost every area of computing. On the other hand, Wireless Sensor Networks (WSN) has gained attention for their potential supports and attractive solutions such as IoT, environment monitoring, healthcare, military, critical infrastructure monitoring, home and industrial automation, transportation, business, etc. Besides, our virtual groups and social networks are in main role of information sharing. However, this sensor network lacks resource, storage capacity and computational power along with extensibility, fault-tolerance, reliability and openness. These data are not available to community groups or cloud environment for general purpose research or utilization yet. If we reduce the gap between real and virtual world by adding this WSN driven data to cloud environment and virtual communities, then it can gain a remarkable attention from all over, along with giving us the benefit in various sectors. We have proposed a Pub/Sub-based sensor virtualization framework Cloud environment. This integration provides resource, service, and storage with sensor driven data to the community. We have virtualized physical sensors as virtual sensors on cloud computing, while this middleware and virtual sensors are provisioned automatically to end users whenever they required. Our architecture provides service to end users without being concerned about its implementation details. Furthermore, we have proposed an efficient content-based event matching algorithm to analyze subscriptions and to publish proper contents in a cost-effective manner. We have evaluated our algorithm which shows better performance while comparing to that of previously proposed algorithms.
Bera, Susanta,Lee, Sol A,Kim, Chang-Min,Khan, Hasmat,Jang, Ho Won,Kwon, Se-Hun American Chemical Society 2018 Chemistry of materials Vol.30 No.23
<P>Fabrication of semiconductor thin films with uniform and vertically aligned one-dimensional nanostructures is an active area of research. We report the synthesis of vertically aligned nanograss (NG)-structured SnO<SUB>2</SUB> thin films on a wide range of substrates with a vapor-solid deposition process. In this process, some chemical and physical parameters, such as chemical composition, deposition height from the precursor mixture, deposition temperature, and substrate roughness, are found to play key roles during the growth of SnO<SUB>2</SUB> nanograsses (SNGs). The effects of density change and cross-sectional dimension (width) of the nanograsses (NGs) on surface area improvement of the thin films have been examined by varying the respective parameters. BiVO<SUB>4</SUB> (BV) solution layers were coated onto SNG, forming core-shell type-II heterojunction thin films (SNG-BV). The thickness of the drop-cast BiVO<SUB>4</SUB> solution layers onto the NGs was controlled by the number density of the NGs per unit area. Light absorption efficiency (η<SUB>abs</SUB>) of the core-shell SNG-BV films has been optimized by controlling quasi-arranged periodicity of the core NGs and accessible shell thickness of BiVO<SUB>4</SUB> layers. The charge separation efficiency (η<SUB>sep</SUB>) of SNG-BV films strongly depends on the thickness of the BiVO<SUB>4</SUB> layers onto NGs. Thin layers of BiVO<SUB>4</SUB> coating along the axial direction of thinner SnO<SUB>2</SUB> NGs (25-50 nm) shows enhanced η<SUB>sep</SUB> but lower η<SUB>abs</SUB> due to poor light absorption. On the other hand, the thicker core NGs (40-200 nm) with low surface area provide thick layers of BiVO<SUB>4</SUB>, which drives strong light absorption but suffers from efficient η<SUB>sep</SUB>. However, intermediate layers of BiVO<SUB>4</SUB> onto uniformly arranged SnO<SUB>2</SUB> NGs with 30-70 nm width shows enhanced η<SUB>abs</SUB> as well as efficient η<SUB>sep</SUB> compared to other SNG-BV samples. This result demonstrates that control over the horizontal dimension of the core materials in the core-shell heterojunction (keeping vertical restriction) is a viable approach for optimizing the photoelectrochemical efficiency.</P> [FIG OMISSION]</BR>