1,721,018 research outputs found
Synthesis and Characterization of Molecular Magnetic Systems
No full textFaculty mentors: Pavlo V. Solntsev, Viktor N. NemykinPartial degradation of ferrocene-1,1'- dicarboxylic acid (FdcH2) in a MeOH/ H2O system results in formation of a very unusual neutral (Fdc)6Fe7(µ4-O)(µ3-OMe) clusters, which were characterized by x-ray crystallography and elemental analysis.This research was supported by the Undergraduate Research Opportunities Program (UROP).Popescu, Vlad. (2012). Synthesis and Characterization of Molecular Magnetic Systems. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/124151
IoT architecture for multisensorial media
No full textOne of the goals of next generation home entertainment is to provide realistic media contents to the users. Realistic media contents are media with multiple sensorial effects (mulsemedia) aimed at increasing user's experience through the five sense representation (i.e., taste, sight, touch, smell, and hearing). In this research area, a key issue is the interconnection between the various output devices that control the additional hardware, delivering the additional sensorial effects to the user. Besides the traditional point-to-point wired or wireless communication with the rendering devices for multisensorial media, novel communication architectures can be used, such as the ones based on the Internet of Things (IoT) paradigm. This paper presents an IoT-based architecture for Multisensorial Media, analysing the requirements and proposing a first proof of concept of the architecture
Robust multi-rate modulation for cognitive radio communications over land mobile satellite channel at Ku-band
Full text linkThe usable satellite spectrum is becoming scarce because of continuously increasing demand for broadcast, multimedia and interactive services. Because of the extensive use of predictive coding, multimedia data exhibit different sensitivities to transmission errors, which makes them suitable for unequal error protection (UEP) techniques. UEP mainly relies on differentiated error control coding which raises the robustness of data, but also increases the transmission bandwidth, which can be unwanted in case of limited resources often occurring in satellite communications. In this context, cognitive radio (CR) satellite communications has received important attention lately in the research community. In multi-rate modulations (MRM), the properties of dy-homogeneous signals are exploited to transmit over multiple band frequencies and time scales. MRM have been proved to be effective on unknown channels either in bandwidth or time. These conditions occur in CR networks where opportunistic communications are set up while preserving primaries licensed users. In CR, the uncertainty of transmission opportunity makes the use of error correcting codes not trivial. Therefore, to achieve robustness, this work proposes unequal power allocation (UPA) over the symbols of MRM according to both data sensitivity to channel errors and spectrum availability. As optimization criterion, the mean square error between the original and the decoded message, which has shown strong correlation with subjective perception, is used. To assess the effectiveness of the proposed scheme in realistic condition for CR satellite networks, the Land Mobile Satellite (LMS) model at Ku-band is used to reproduce the memory associated with real channels. The non-linearity of the satellite channel because of high power amplifier (HPA) prior to transmission has been accounted using the Saleh model. Copyright © 2016 John Wiley & Sons, Ltd
An SDR-Based Satellite Gateway for Internet of Remote Things (IoRT) Applications
Full text linkInternet-of-Things (IoT) represents a breakthrough for the current ICT market. In many IoT applications, sensors and actuators are distributed over very wide areas, sometimes not reached by terrestrial networks. In such scenarios, the satellite plays a significant role. In this paper, a Software-Defined Radio (SDR) - based satellite gateway for Internet-of-Remote-Things (IoRT) is proposed. The use of SDR allows to decrease equipment cost and provides higher flexibility. The proposed architecture has been implemented by using a standalone SDR platform and Commercial Off-The-Shelf (COTS) modules for covering the main terrestrial IoT standards. Extensive proof-of-concept results are presented and discussed. Uplink and downlink tests showed the correct functionality implementation and transmitted signal generation, while the integration tests allowed to assess the reliability of the end-to-end information processing. Reconfigurability tests confirmed the capability of the gateway of dynamically updating in real-time its protocol settings. The overall test results showed the validity of the proposed SDR-based gateway for IoRT applications
Experimental setup for IoT-Based multi sensorial media
No full textOne of the goals of next generation entertainment services is to provide realistic media contents to the users. The user's sense of reality can be reinforced by adding to conventional media multiple sensorial effects. In a home environment, for the delivery of additional effects, customary devices (e.g., air conditioning, lights, etc.), enhanced with 'smart' features, could be preferred to ad-hoc devices, such as those often deployed in applications such as for example gaming systems. In this context, a key issue is the interconnection among the smart TV and the customary devices that deliver the additional sensorial effects to the user. In smart home use cases, the Internet of Things (IoT) paradigm has been widely adopted to connect smart devices and this paper presents an IoT-based experimental set-up for multi sensorial media delivery to users in a home entertainment scenario. The home customary devices act as smart objects interconnected by means of an IoT architecture to the TV. In this study, a first experimental set-up is implemented in a real smart home scenario with real customary devices, which allowed to assess the feasibility of the proposed multi sensorial media system
Coexistence issues for IEEE 802.22 WRAN and DVB-T2 networks
No full textCognitive Radio systems have been studied to be deployed especially in the so-called TV White Spaces (TVWS) which are defined as the TV free channels left unused in specific territorial area as direct consequence of the digital switchover plans. The IEEE 802.22 Wireless Regional Area Network (WRAN) standard has been developed to exploit the TVWS bands to assure broadband access for remote and rural areas. WRAN devices are designed to operate in the frequency range 54-862MHz alongside Digital Terrestrial Television (DTT) transmissions. This paper studies the influence of adjacent channel interference of DTT signals on IEEE 802.22 WRAN transmission. The performance of IEEE 802.22 WRAN devices in the presence of with DVB-T2 broadcasting systems is evaluated
QoE Assessment for IoT-Based Multi Sensorial Media Broadcasting
No full textOne of the goals of next generation TV broadcast services is to provide realistic media contents to the users. The user's sense of reality can be reinforced by adding to conventional media multiple sensorial effects, through five-sense stimulus (i.e., taste, sight, touch, smell, and hearing). In a smart TV broadcasting context, especially in a home environment, to deliver the additional effects, customary devices (e.g., air conditioning, lights, etc.), provided of opportune smart features, have to be preferred to ad-hoc devices, often deployed in other applications as for example in gaming systems. In this context, a key issue is the interconnection among the smart TV and the customary devices that deliver the additional sensorial effects to the user. In smart home use cases, the Internet of Things (IoT) paradigm has been widely adopted to connect smart devices and this paper presents an IoT-based architecture for multi sensorial media delivery to TV users in a home entertainment scenario. In such a framework, home customary devices, act as smart objects interconnected via IoT network to the smart TV and play a role to implement additional effects to the conventional broadcast TV service. In this paper, the requirements in terms of synchronization between media and devices is analyzed and the architecture of the system is defined accordingly. Furthermore, a prototype is implemented in a real smart home scenario with real customary devices, which allowed a subjective test measurement campaign to assess the quality of experience of the users and the feasibility of the proposed multi sensorial media TV service
QoE Assessment for Broadcasting Multi Sensorial Media in Smart Home Scenario
No full textOne of the goals of future TV broadcast services is to provide realistic media contents to the users. The user's sense of reality can be reinforced by adding to conventional media multiple sensorial effects, through five-sense stimulus (i.e., taste, sight, touch, smell, and hearing). In a smart home environment, to deliver the additional effects, customary devices (e.g., air conditioning, lights, etc.), provided of opportune smart features, have to be preferred to ad-hoc devices, often deployed in other applications as for example in gaming systems. In this context, a key issue is the interconnection among the TV and the customary devices that deliver the additional sensorial effects to the user. In such a framework, home customary devices play a role to implement additional effects to the conventional broadcast TV service. In this study, a prototype is implemented for broadcasting multi sensorial media in a real smart home scenario. Real customary devices are deployed. A subjective test measurement campaign based on mean opinion score was performed to assess the Quality of Experience of the users and the feasibility of the proposed multi sensorial media TV service
Internet of Things for Enabling Multi Sensorial TV in Smart Home
No full textThis paper presents the results of a subjective test campaign performed on a real smart home scenario and aimed at assessing the enrichment of the quality of experience of real users. A proof of concept of an IoT based architecture deploying customary devices in a smart home environment is implemented and used for test assessments. If opportunely embedded on the content stream or in the broadcasting transmission technology, multi sensorial meta data could be interpreted by a smart TV and used in a smart home environment to provide users with an enriched TV experience, via the proposed IoT architecture
Multi-rate modulation for cognitive radio over land mobile satellite channel
No full textMultiple transmission of heterogeneous multimedia services is a central aspect of satellite communication technology. In this framework, often the design of efficient communication systems is complicated by stringent bandwidth constraint. Due to the extensive use of predictive coding, compressed data exhibit different sensitivities to transmission errors which makes them suitable for unequal error protection (UEP) techniques. UEP mainly relies on differentiated error control coding which raises the robustness of data, but also increases the transmission bandwidth. Reed-Solomon (RS) or Turbo Codes (TC) are frequently used, but also more performing techniques, based on Rate-Compatible (RC) codes have been proposed by the research community. In multi-rate modulations (MRM) the properties of dy-homogeneous signals are exploited to transmit over multiple band frequencies and time scales. MRM have been proved on unknown channels in either bandwidth or time. These conditions occur in cognitive radio (CR) networks where opportunistic communications are set up while preserving primaries licensed users. In CR the uncertainty of transmission opportunity makes the use of error correcting codes not trivial. Therefore, to achieve robustness this work proposes unequal power allocation (UPA) over the symbols of MRM according to both data sensitivity to channel errors and spectrum availability. As optimization criterion the mean square error between the original and the decoded message, which has showed strong correlation with subjective perception, is used. To assess the effectiveness of the proposed scheme in realistic condition for CR satellite networks the Land Mobile Satellite (LMS) model is used to reproduce the memory associated with real channels
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