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An autonomous Internet of Things (IoT) wireless sensor network (WSN) powered by a solar energy harvester with low power electronics is presented in this paper. The power supply is a critical challenge for IoT sensors as many of them normally have limited lifetime due to the battery with limited capacity used. The WSN system, sensor node electronics, and the energy harvesting techniques are all configured...
We show that Akhmediev breathers can appear even in partially coherent nonlinear systems. We find that the degree of coherence can significantly affect the onset of these waves and can critically alter their ensuing dynamics.
In view of LCL-type grid-connected inverter system, traditional methods can hardly realize multigoal analysis and optimization, thus, a research is carried out on the visualization method based on D-partition method. In consideration of the discrete characteristic of digital control, this paper infers the establishment conditions of D-partition method in z domain, and compares it with D-partition...
As mobile computing is becoming more and more popular, the security threats to mobile applications are simultaneously increasing explosively. Most malicious activities hack the user's private information, such as contact and location information, hijack the user's transactions and communications, and exploit the confidential enterprise data stored in mobile databases or in cache on mobile devices...
With the development of renewable energy, the influence of photovoltaic power plant on power grid is increasing. In order to study the influence of large-scale photovoltaic power plant on power system, it is necessary to establish a centralized equivalent model of large-scale photovoltaic power plant composed of many power generation units to avoid the problem that simulation time is too long. In...
Partial disjoint multipath routing has been largely deployed in networks such as wireless sensor networks, outperforming single path routing in load balance and fault tolerance, etc. However, disjoint multipath routing has not been widely deployed in networks, because the difficulty of designing an accordingly distributed algorithm. Software defined networking (SDN) is based on the abstract of the...
A single-feed polarization reconfigurable magneto-electric (ME) dipole antenna is presented in this paper. With the manipulation of the diode states, the proposed ME dipole can provide three states of polarization control (one linear polarization and two orthogonal circular polarizations). To improve the effective bandwidth, antenna efficiency and front-to-back ratio, which are critical for wireless...
The detection and extraction of buildings using high resolution synthetic aperture radar (SAR) images has been the topic of recent discussions. In this paper, a framework for building extraction and classification is proposed. Buildings are classified into three kinds: commercial architecture, residential building and Industrial building, by the fusion of structure features (point-like, linear and...
Ship classification with spaceborne high resolution synthetic aperture radar (SAR) has wide applications in maritime traffic monitoring, fishing law-enforcement operation, marine security, etc. Deep learning, which has the ability of learning features itself, is successfully used in computer vision and artificial intelligence, and introduced into remote sensing field in recent years. In this study,...
The accuracy of satellite-derived sea surface temperature (SST) fields has drawn a great deal of attention, while little attention has been focused on the spatial precision. Very limited information of the uncertainty in pixel-to-pixel scale in the retrievals is provided by satellite in-situ matchups, which are widely separated in space and time because of cloud cover and the lack of in-situ observation...
To explore the capability of quad polarimetric SAR images from a new pursuit monostatic mode of TerraSAR-X and TanDEM-X, a novel process chain for ship detection and velocity estimation is proposed in this paper. Compared with the classic processing chain used for single SAR image, more efficient techniques are integrated into this novel chain, which take advantage of the new image mode and its excellent...
We design a kind of object manipulation system, which is based on Robot Operating System (ROS) distributed processing framework. This system can communicate with human beings; can percept the 3D environment by RGB-D sensor; has the ability of reasoning; can transfer the natural language intention to machine instruction to control the movement of manipulator. In particular, an improved Case-Based Reasoning-Belief-Desire-Intention...
Wireless sensor network (WSN) plays an important role in monitoring applications in many areas. This paper presents a WSN called EN-Nets which is based on a newly designed small-size and low-power sensor node (EN-Node) for monitoring real-time environmental conditions. Detailed design and implementation of the sensor node for sensing and communicating environmental parameters are described. A power...
Mobile crowdsensing has emerged as a promising paradigm for data collection due to increasingly pervasive and powerful mobile devices. There have been extensive research works that propose incentive mechanisms for crowdsensing, but they all make the assumption that mobile users will positively complete the allocated sensing tasks. In this paper, we consider a new and practical scenario of crowdsensing,...
In all the researches in wireless sensor networks, cameras are increasingly utilized for their surveillance capabilities. In this paper, we elaborately discuss about the problem of Full-View Barrier Coverage with Rotatable Camera Sensors (FBR), including weakly and strongly connected versions. FBR is proven to be NP-hard in this paper by reducing Group Steiner Tree problem to it. Our goal is to reduce...
In the past decade, with the rapid development of wireless communication and sensor technology, ubiquitous smartphones equipped with increasingly rich sensors have more powerful computing and sensing abilities. Thus, mobile crowdsensing has received extensive attentions from both industry and academia. Recently, plenty of mobile crowdsensing applications come forth, such as indoor positioning, environment...
Secret key establishment is a fundamental requirement for private communication between two wireless entities. An intriguing solution is to extract secret keys from the inherent randomness shared between them. Although several works have been done to extract secret keys from different kinds of mediums (e.g., RSSI, CSI, CIR), the efficiency and security problems are not fully solved. In this paper,...
With the rapid growth of smart devices, mobile crowdsensing is becoming an important paradigm to acquire information from physical environments. Considering that the sensing data collected by mobile users are normally noisy and imprecise, one of the pressing problems in mobile crowdsensing is to evaluate the data quality in real time and to steer users to acquire data with high quality. However, it...
The recent proliferation of mobile devices embedded with capable sensors, provides an opportunity to the popular concept of mobile crowdsensing. By studying the correlation of crowd-sensed data in both spatial and temporal dimensions, we can get a clear understanding of the intrinsic pattern of data in mobile crowdsensing, which is the basic for further data analysis, such as data filtering, smoothing...
As the number of electronic components in automobiles increases, the electronic industry has seen an increasing demand for organic packaging materials that meet property requirements for long operations in harsh environments. One of the most challenging requirements for molding compounds for automotive electronics is high thermal stability. The plastic encapsulation material should survive continuous...
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