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In this paper, we consider a scenario where an energy harvesting sensor continuously monitors a system and sends time-stamped status updates to a destination. The destination keeps track of the system status through the received updates. We use the metric Age of Information (AoI), the time that has elapsed since the last received update was generated, to measure the “freshness” of the status information...
Mobile crowd sensing is an emerging sensing paradigm where sensing applications buy sensor data from mobile smartphone users (workers) instead of deploying their own sensor networks to estimate some statistics of a spatial event. In many spatial monitoring applications, the crowdsourcer needs to incentivize smartphone users to contribute sensing data so that the collected dataset has good spatial...
In this paper, we study the optimum sensing of a time-varying random event with a sensor powered by energy harvesting devices. The system aims at reconstructing a band-unlimited continuous-time random process by using discrete-time samples collected by a sensor. Due to the random nature of the harvested energy, the sensor might not have sufficient energy to perform a sensing operation at a desired...
Aiming at farmland information monitoring in remote mountain areas, using wireless sensor networks (WSNs) and unmanned aerial vehicle (UAV) is a good way to collect the information. However, UAV has some limitations, such as energy, that have limitation on the work time of UAV. Therefore, the path planning for UAV is an important factor in order to gather data correctly. Considering the irregularity...
Data fusion techniques are a promising solution to increase the lifetime of wireless sensor networks, because it allows the reduction of data that needs to be transmitted back to the network sink. However, data fusion schemes are vulnerable to Byzantine attacks. Specifically, a Byzantine (dishonest) data fusion node can send falsified fusion data to mislead the sink. Hence, many witness-based schemes...
There have been a number of deficiencies in domestic waste source regulation, dynamic monitoring, etc‥ caused by geographical conditions, technology and other factors for a long time which brought low efficiency and illegal behaviors to refuse treatment. As a new network technology, IOT has significant advantages for its traceability, dynamic characteristics in solving the problems above. This paper...
The paper proposes the architecture of cloud service system of oil and gas exploration and production (CSSOOGEP). The system uses virtualization to pool infrastructure resource, logically unify, manage, and assign host, network or other resources. It takes advantage of service dynamic integration and other technologies to provide services package and registration, query, update, and on-demand integrated...
In this paper, we propose a novel optical notch filtering scheme, which can be used for optical signal to noise ratio (OSNR) monitoring. OSNR monitoring for 10-Gb/s and 40-Gb/s NRZ-OOK, NRZ-DPSK and Duo-binary signals are demonstrated in VPI transmission maker 7.6. Low bandwidth photo detector adopted in the monitoring scheme would provide immunity to chromatic dispersion (CD) and low cost solution.
In this paper, we propose a simple in-band optical signal to noise ratio (OSNR) monitoring method based on the beat noise RF power measurement. This method splits the incoming optical signal into two branches, and one of the branches is processed by an optical band pass filter. Then, the signals in the two branches are detected by balanced receiver and the beat noise can be calculated. The simulation...
Clouds computing, as the latest IT operating model in the Internet Age, is an innovative information system (IS) architecture. Virtualization technology, being the most effective solution to the resource management of cloud computing, excels in its virtual machine real-time migration technology. In order to reduce the migration downtime, Magician optimization migration framework is proposed, based...
Chromatic dispersion (CD) and polarization mode dispersion (PMD) monitoring methods based on RF spectrum analysis are demonstrated experimentally. By using a narrow band FBG notch filter, centered at optical carrier/10GHz away from carrier, corresponding RF power ratio/power can be used as CD/PMD monitoring signal in high-speed optical communication systems such as 57-Gbit/s D8PSK.
We demonstrate a simple chromatic dispersion (CD) monitoring method using amplitude ratio of asynchronous delay-tap sampling plot. By utilizing amplitude ratio in the delay-tap sampling plot, the residual CD values in the range of 0~75 ps/nm can be measured for 40-Gbit/s 67% carrier-suppressed return-to-zero (CSRZ) differential quadrature phase-shift keying (DQPSK), 50% return-to-zero (RZ) DQPSK and...
Conditional monitoring and fault diagnosis is one of the most important application of data fusion technology, and it has played an important role in many fields today. But conditional monitoring and fault diagnosis is currently facing a prominent problem that the type of information which need be fused is different. Traditional methods of data fusion are lack of mathematical basis when they are used...
The reliability and versatility of the traditional fire monitoring system based on single-sensor information is relatively poor. In this paper, a fire monitoring system based on multi-sensor information fusion is discussed, and which adopts the ART2 (adaptive resonance theory model) and the three-layer BP neural network for two-layer fusion processing for temperature, smoke and CO sensors information,...
We propose a technique on chromatic dispersion (CD) monitoring based on RF power ratio measurement. Both simulation and experimental results show that the method is efficient on eliminating polarization-mode dispersion (PMD) effects in CD measurement.
In this paper, we propose a chromatic dispersion (CD) monitoring technique based on fiber Bragg grating (FBG) filtering and RF power ratio measurement. This method can measure CD value without the effects of polarization-mode dispersion (PMD) and received power for non-return-to-zero (NRZ) phase-modulated signals. A narrowband FBG notch filter is placed at the optical carrier wavelength, such that...
A CD insensitive PMD monitoring scheme based on measuring RF power is demonstrated experimentally. By using a narrow band FBG notch filter, one of sideband is filtered out and the corresponding RF power can be used as CD insensitive PMD monitoring signal. It is experimentally shown that the proposed method is efficient on measuring the DGD values in 57-Gbit/s D8PSK and 38-Gbit/s DQPSK systems.
We propose and demonstrate a technique on chromatic dispersion (CD) insensitive polarization mode dispersion (PMD) monitoring based on RF tone power measurement using a narrow band fiber Bragg grating (FBG) notch filter. By filtering out the optical component at 10-GHz (1/4 of the bit rate) away from the carrier in one sideband, the RF tone generated by beating between the carrier and the component...
The Real Time Kinematics Global Positioning System (RTK-GPS) has been proved to be a feasible tool for structure health monitoring. However, there are some limitations using the traditional RTK method under the long baseline conditions, and annoying ionospheric delay.To eliminate this delay, in this paper we present an improved Extended Kalman Filter with Triple-Differenced Ionospheric-Free (EKF-TDIF)...
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