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The edge computing techniques have been developed to support the exponentially increasing service demands in the fifth generation (5G) networks by bringing the data contents and their corresponding computations/communications near to mobile users. As a promising and efficient solution to implement edge computing techniques, mobile data offloading complements the traditional cellular transmission through...
We have previously proposed a novel parameter identification method for the Li-ion battery equivalent circuit model (ECM) considering the electrochemical properties, with which a second order ECM resistances/capacitances values can be obtained from electrochemical parameters. In this paper, we apply this physics-based ECM with Kalman filter for cell SOC estimation. To implement the Kalman filter to...
Global warming and rapid urbanization have great impacts on local temperature and urban heat island (UHI) effects. However, most of the previous research paid very little attention to the impact of natural terrain on UHI effects. This work reported the effects of complex terrain on UHI characteristics. As the second largest city in Northwest China, Lanzhou was selected as the research region since...
With the rapid growth of information services, enormous amount of text corpus cannot simply be read and understand. Therefore, text clustering and visualization present a direct way to observe the documents as well as understand the topic by corresponding keywords. However, even a short paragraph contains a variety of words, which makes the keyword or topic extraction difficult to achieve. Therefore,...
The Internet of things (IoT) has been widely recognized by governments and industry because of its huge application prospect. And more and more attention has been paid to the development of E-commerce. This paper mainly from the network technology and E-commerce perspective, through the technology of IoT in the application of E-commerce analysis, to explore how networking technology and E-commerce...
The existing credit rating system of China's bond market is relatively unreliable. Credit rating results have no effect on warning risks, but the downgrade of the bond and its issuer is timely and objective when risk events or bad performances occurring. In this paper, we intend to predict the downgrade of the bond directly. By analyzing and decomposing the problem, we propose a cost-sensitive temporal...
The coupling of power systems with cyber networks poses security issues that may threaten the safety and robustness of power systems. In this paper, by combining stochastic process with a state transition description, a stochastic model is presented for describing cascading failure in a cyber-coupled smart grid. A dedicated algorithm is developed to simulate the dynamic profile of the cascading failures,...
We address secure communications over energy-harvesting based OFDMA cooperative cognitive radio networks, where one primary user (PU) cooperates with several secondary users (SUs) in terms of both information transmission and energy harvesting. To improve spectrum utilization and ensure that SU transmitters can harvest as much energy as possible, we suppose that SUs are equipped with orthogonally...
In the non-time-slotted cognitive radio networks (CRNs), the synchronization between PUs and secondary users (SUs) cannot be guaranteed, resulting in two challenging problems: the reactivation-failure of PUs and the frequently unexpected hand-offs among SUs. The reactivation-failure of PUs is the incident that the SUs cannot detect the PUs' reactivation when the SUs are occupying the channels to transmit...
In this paper, we develop a stochastic model from the perspective of complex networks to investigate the effects of cyber coupling on cascading failures in coupled power systems. The failure spreading in the coupled system is described by state transition and modeled as a Markov process. We simulate the dynamic profile of the cascading failures caused by the attack of cyber malwares, considering the...
In this paper, we investigate the dynamic profiles of the cascading failure propagations in power systems. We use a circuit-based power flow model and combine it with a stochastic model to describe the uncertain failure time instants. The sequence of failures is determined by power stresses of individual elements which are governed by deterministic circuit equations, while the time durations between...
To support the emerging next era of mobile wireless networks, researchers have made a great deal of efforts in promising techniques in multimedia services — the statistical quality of service (QoS) technique, which has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, as the 5G-promising techniques,...
In edge computing wireless networks, popular data contents can be stored in mobile devices to provide the local data resources services, so that a mobile user can obtain these data contents directly from its nearby mobile devices instead of the remote service provider. Even though each mobile device's caching memory can be limited, caching in mobile devices offers the great potential of caching capability...
Time and cost are the most critical performance metrics for computer systems including embedded system, especially for the battery-based embedded systems, such as PC, mainframe computer, and smart phone. Most of the previous work focuses on saving energy in a deterministic way by taking the average or worst scenario into account. However, such deterministic approaches usually are inappropriate in...
Breath test is a prevalent detection method for gastrointestinal function, which is widely used on the diagnosis of carbohydrate malabsorption, and other gastrointestinal diseases. In this paper, a design of virtual electronic nose was presented to detect the concentration of hydrogen, methane and carbon dioxide in breath. The sample was pushed into chromatographic column for separation and every...
We address secure communication for energy-harvesting (EH) based cooperative cognitive radio networks (CRNs), in which several EH secondary users (SUs) cooperate with one primary user (PU) for both data transmission and energy harvesting. To increase the amount of energy harvested by SUs while improving spectrum utilization, we suppose that SUs are equipped with orthogonally dual-polarized antennas...
To support the emerging next generation wireless networks, researchers have made a great deal of efforts in investigating promising techniques in multimedia services - the statistical quality-of-service (QoS) technique, which has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, as the two 5G-promising...
With the explosive development of the next era for mobile wireless networks, there has been a lot of studies in the promising techniques for multimedia services - the statistical quality-of-service (QoS) technique, which has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, as the 5G-promising techniques,...
As a critical technique to support the multimedia services - the major traffic in cognitive radio networks (CRNs), the statistical quality-of-service (QoS) technique has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, in modern CRNs, cooperative spectrum sensing is shown to be able to greatly improve...
To support the emerging next era of mobile wireless networks, researchers have made a great deal of efforts in promising techniques in multimedia services - the statistical quality-of-service (QoS) technique, which has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, as one of the 5G-promising techniques,...
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