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The growing demand for spectrum resources and the limited licensed spectrum have led to widespread concern about the coexistence of LTE and WiFi in the unlicensed spectrum. Since LTE and WiFi are two different systems, many solutions have been proposed to solve their coexistence problems, including the coexistence scheme based on blank subframe allocation. This paper presents a scheme that uses Q-learning...
This paper investigates the secrecy performance of half-duplex relay networks. First, we establish a relay broadcasting wiretap channel model using a half-duplex relay with multiple antennas and derive the instantaneous secrecy capacity of this system. With convex optimization, the upper bound on the capacity region is provided. Second, we give the expression for the ergodic secrecy rate and analyze...
In this paper, a two-stage analog interference cancellation architecture is proposed for the prevailing full-duplex communication systems. Within the architecture, a one-tap analog cancelling circuit is first deployed to reconstruct and cancel the strong leakage self interference (SI) to yield a residual multi-path SI of reduced dynamic range. Subsequently, an auxiliary transmit chain is deployed...
In this paper, we pursue a detailed outage probability analysis of multihop relaying systems taking into account the practical constraint of cochannel interferences (CCIs). Different from previous works, both relaying transmission and CCIs are performed over generalized $\kappa$-$\mu$ fading channels. For both independent identically and non-identically distributed $\kappa$-$\mu$ faded CCIs, the exact...
Natural ester as an environmentally friendly dielectric liquid is becoming commonly used in power transformer. However, it is susceptible to oxidation. Under severe oxidation, the oil sample could gel whose impact on insulation performance is not known. In this research, we focus on the impact of the gelling process of natural ester on its breakdown characteristics. In order to survey this, a breakdown...
Syslogs on switches are a rich source of information for both post-mortem diagnosis and proactive prediction of switch failures in a datacenter network. However, such information can be effectively extracted only through proper processing of syslogs, e.g., using suitable machine learning techniques. A common approach to syslog processing is to extract (i.e., build) templates from historical syslog...
With the increasing popularity of serving and storing data in multiple data centers, we investigate the efficiency of majority quorum-based data consistency algorithms under this scenario. Because of the failure-prone nature of distributed storage systems, majority quorum-based data consistency algorithms become one of the most widely adopted approaches. In this paper, we propose the MeteorShower...
Blast furnace gas (BFG) is one of the important secondary energy in the iron and steel enterprises. The reasonable use of BFG can raise economic profit and alleviate the environment pollution. The existing scheduling mode may cause not only a waste of gas, but also additional operations for compensating the inadequate initial scheduling. In this study, a dynamic causal diagram and constraint-based...
It is significant to perform an effective scheduling of byproduct gas system in steel industry for reducing cost and protecting environment. The existing studies largely focused on extracting specific knowledge from human experience or directly optimizing the scheduling performance, which failed to provide a dynamic optimization process for making the scheduling scheme updated online. In this study,...
Internet of Things is one of the hottest topics in both industry and academia of the communication engineering world. On the other hand, wireless mesh networks, a network topology that has been discuss for decades that haven't been put into use in large scale, can make a difference when it comes to the network in the IoT world today. This paper is a brief introduction of how these technologies has...
In big data era, individuals are surrounded by various kinds of social medium, such as Facebook, Twitter and Microblog. These social media produce vast information every day and support diverse social contagions. However, the dynamics and mechanisms of these social contagions are still obscure and unrevealed because of the big data. In this paper, we propose a novel non-Markovian social contagion...
A novel four-element MIMO antenna operating at millimeter wave band is proposed. The half-mode substrate integrated waveguide (HMSIW) cavity backed slot antenna is used as the element to realize a compact structure, high radiation efficiency and interelement isolation. The simulated relative impedance bandwidth is 29.6% from 23.5–31.0GHz for S11<−10dB. And the isolation is lower than −22dB across...
In this paper, we study the problem of distributed blind equalization in single-input multi-output (SIMO) systems, wherein the channels of networked systems share some similarities. This corresponds to a multi-task optimization problem. To tackle this problem, an adaptive distributed generalized Sato algorithm (d-GSA) using the diffusion cooperation rule is proposed. In the proposed d-GSA, only the...
The massive amounts of machine-type user equipments (UEs) will be supported in the future fifth generation (5G) networks. However, the potential large random access (RA) delay calls for a new RA scheme. Motivated by the key idea of non-orthogonal multiple access, the non-orthogonal random access (NORA) scheme is proposed in this paper to alleviate the access congestion problem. Specifically, NORA...
The satellite relaying system is a promising network architecture in next generation wireless communication systems, due to its large coverage and stability. In this paper, the performance of a dual-hop decode-and- forward based satellite relaying system over $\kappa$- shadowed fading channels is investigated, where a source earth station transmits information to a destination earth station via...
An omnidirectional horizontally polarized antenna with an ultra-wideband impedance and radiation bandwidth is proposed in this paper. The connected Vivaldi antenna array is firstly applied to realize a UWB horizontally polarized antenna with good omnidirectional radiation properties. The designed antenna exhibits a relative impedance bandwidth of 163.17% for |S11|<-10dB (1.45–14.3GHz). Meanwhile,...
A wideband horizontally polarized (HP) omnidirectional antenna is presented. The tightly coupled array (TCA) mechanism is ultilized into the design of the antenna to realize reduced lower cut-off frequency and improved bandwidth. The −10dB impedance bandwidth is 102.6% from 4.8GHz to 14.7GHz. Meanwhile, uniform omnidirectional radiation patterns with a gain variation of less than 3dB are obtained...
Dynamic symbolic execution is an important automated testing technique. Firstly, we introduce the traditional symbolic execution and dynamic symbolic execution technology, and then review the research status of Python application testing with dynamic symbolic execution technology. Then we compare and analyze the dynamic symbolic execution tools with the existing Python programs and Architectures,...
Automatically generation of full life cycle computer aided animation is a combination of a cartoon art, artificial intelligence technology and film art research field. In 3D animation automatically generated there has been progress, this paper attempts to expand it to the field of two-dimensional animation, this paper puts forward a 2D animation auto generation technology. For the two-dimensional...
Objective To evaluate the application of a 3D haptic virtual reality simulation system for training dental crown preparation in dental preclinical education. Methods Fifteen students (novice group) and 12 prosthodontic residents (residents groups) were included in this study. All of the participants took the tests to perform tooth preparation for a metal-ceramic crown using a 3D haptic virtual reality...
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