scholarly journals Characterization and Performance of a Thermal Camera Communication System

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3288 ◽  
Author(s):  
Victor Guerra ◽  
Jaime R. Ticay-Rivas ◽  
Victor Alonso-Eugenio ◽  
Rafael Perez-Jimenez
Keyword(s):  
Sensor Networks ◽  
Public Transportation ◽  
Emergency Situation ◽  
Thermal Camera ◽  
Noise Characteristics ◽  
Current State ◽  
And Performance ◽  
Achievable Data Rate ◽  
Comprehensive Characterization

This work presents a novel communications technology named Thermal Camera Communication (TCC), which is analogous to Optical Camera Communication (OCC). Thermographic cameras and Peltier cells are proposed as receiver and transmitter, respectively, changing completely their usual field of application. Furthermore, a comprehensive characterization of the Peltier–Thermal camera pair is carried out, presenting their bandwidth, achievable data rate under On-Off-Keying (OOK) modulation, noise characteristics, and energy efficiency. A comparison against the current state-of-the-art OCC technology is also provided, showing that TCC is a promising technology suitable for sensor networks. The thorough analysis of TCC performed in this work shows that commercial Peltier cells can be re-thought under a communications viewpoint in order to improve their performance. This novel communication technology can be applied in environments such as the access to public transportation or buildings due to the new health emergency situation. The use of thermographic cameras will become massive and dual measurement and communication purposes could be considered for applications such as sensor networks, using a yet unexploited wavelength range.

The continuing search for the Holy Grail

2018 ◽  
Vol 16 (1) ◽  
pp. 97-106
Author(s):  
Robert M. Wiseman ◽  
Hadi Faqihi
Keyword(s):  
Design Methodology ◽  
Three Dimensions ◽  
Multiple Stakeholders ◽  
Future Directions ◽  
Content Type ◽  
Current State ◽  
Novel Approach ◽  
Ceo Pay ◽  
And Performance

Purpose The purpose of this paper is to enrich the finding by Aguinis et al. (2018) that there is little overlap between the extremes of firm performance and the extremes of CEO pay using a novel approach to characterize the distribution of pay and performance. The authors aim to shift the focus of compensation researchers from fruitlessly trying to link pay to performance to theory-rich accounts of pay that take into consideration the idiosyncratically motivated and socially embedded nature of CEO compensation. Design/methodology/approach The authors’ approach in this commentary is conceptual. They synthesize compensation literature from different fields such as economics, finance, sociology, strategic management and corporate law, as well as the empirical findings from the focal paper to support their characterization of the current state of the literature and future directions it should take. Findings The authors synthesize discussion of CEO pay down to three dimensions of CEO responsibilities and motivations. They argue that a realistic pay design should take into account that CEOs have limited control over performance, they are accountable to multiple stakeholders and they are motivated by financial as well as nonfinancial incentives. Originality/value The commentary presents researchers with high-order framing of CEO pay that goes beyond debating over methodology or narrowly focusing on limited behavioral drivers of pay setting. Instead, the authors encourage researchers to take advantage of their three-legged framework to theorize about CEO pay.

scholarly journals Noise and Breakdown Characterization of SPAD Detectors with Time-Gated Photon-Counting Operation

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5287
Author(s):  
Hiwa Mahmoudi ◽  
Michael Hofbauer ◽  
Bernhard Goll ◽  
Horst Zimmermann
Keyword(s):  
Breakdown Voltage ◽  
Single Photon ◽  
Photon Counting ◽  
Low Noise ◽  
Dark Count ◽  
Fully Integrated ◽  
Trade Offs ◽  
And Performance ◽  
Noise Models

Being ready-to-detect over a certain portion of time makes the time-gated single-photon avalanche diode (SPAD) an attractive candidate for low-noise photon-counting applications. A careful SPAD noise and performance characterization, however, is critical to avoid time-consuming experimental optimization and redesign iterations for such applications. Here, we present an extensive empirical study of the breakdown voltage, as well as the dark-count and afterpulsing noise mechanisms for a fully integrated time-gated SPAD detector in 0.35-μm CMOS based on experimental data acquired in a dark condition. An “effective” SPAD breakdown voltage is introduced to enable efficient characterization and modeling of the dark-count and afterpulsing probabilities with respect to the excess bias voltage and the gating duration time. The presented breakdown and noise models will allow for accurate modeling and optimization of SPAD-based detector designs, where the SPAD noise can impose severe trade-offs with speed and sensitivity as is shown via an example.

scholarly journals Synthesis and Characterization of Novel Bio-Chiral Dopants Obtained from Bio-Betulin Produced by a Fermentation Process

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 785
Author(s):  
Veridiana G. Guimarães ◽  
Anastasiia Svanidze ◽  
Tianyi Guo ◽  
Pawan Nepal ◽  
Robert J. Twieg ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Natural Product ◽  
Fermentation Process ◽  
Synthesis And Characterization ◽  
Cholesteric Liquid Crystals ◽  
And Performance ◽  
Chiral Dopants

Cholesteric liquid crystals are frequently produced by the addition of chiral dopants to achiral nematic hosts. We report here the synthesis and performance of chiral dopants obtained from bio-betulin produced by a fermentation process. An important aspect of this work is to point out that the fermentation process used to obtain the starting materials is much easier and cheaper when carried out in large volumes than isolating it from the natural product. The performance of the dopants obtained from bio-betulin is indistinguishable from those obtained from commercially available synthetic betulin.

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