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Given an image of a street scene in a city, this paper develops a new method that can quickly and precisely pinpoint at which location (as well as viewing direction) the image was taken, against a pre-stored large-scale 3D point-cloud map of the city. We adopt the recently developed 2D-3D direct feature matching framework for this task [23,31,32,42–44]. This is a challenging task especially for large-scale...
Approximations and redundancies allow mobile and distributed applications to produce answers or outcomes of lesser quality at lower costs. This paper introduces RAPID, a new programming framework and methodology for service-based applications with approximations and redundancies. Finding the best service configuration under a given resource budget becomes a constrained, dual-weight graph optimization...
In order to validate the control method of UAV formation, a demonstration system of UAV formation control is built outdoors. The system consists of satellite, UAV, ground control station and data link. The demonstration and verification system uses two sets of ground control stations and data links to ensure the system complete functionality and security, which can achieve a variety of network topology,...
We present the first selectively secure hierarchical identity-based non-interactive key agreement (HIB-NIKA) in the standard model that does not explicitly require multilinear maps. We give a novel solution for resilience called "shadowing factor" to improve the security of HIB-NIKA and present a practical attack model of hierarchical key agreement to analyze the anti-forgery and anti-collusion...
An electric current triggered multifunctional vanadium dioxide (VO2) integrated photonic metamaterial is presented. In our metamaterial design, the nanoengineered topologically continuous metallic structure simultaneously supports the optical and electrical functionalities. Moreover, acting as part of the resonating structure, the VO2 thin film enables the tunable nature of the device. By presenting...
We investigate the symmetry breaking in a side-coupled WG-resonator (SCWR) system. The theory presented in this paper will be helpful for accurate design of photonic functional devices based on SCWR system.
This paper presents angular characteristics for high-speed railway (HSR) channels, based on virtual single-input multiple-output (SIMO) measurements. A virtual array measurement scheme is investigated and used to generate SIMO channel impulse responses (CIRs) from single-antenna measurements in three typical HSR scenarios, including obstructed viaduct, deep cutting, and open station. According to...
Massive multiple-input multiple-output (Massive MIMO) is acknowledged as a key technology for the 5th generation (5G) of wireless communication systems, which theoretically proved to be of higher throughput, better robustness, superior spectrum- and energy- efficiency. A reliable and realistic channel model serves is the enabling foundation for practical design and testing of communication systems...
Perceived as a key enabling technology for the future Internet, Network Virtualization (NV) allows an Infrastructure Provider (InP) to better utilize their Substrate Network (SN) by provisioning multiple Virtual Networks (VNs) from different Service Providers (SPs). A key challenge in NV is to efficiently map the VN requests from SPs on an SN, known as the Virtual Network Embedding (VNE) problem....
Binary descriptors not only are beneficial for similarity search, they are also capable of serving as discriminant features for classification purpose. In this paper we propose a new algorithm based on cross entropy to learn effective binary descriptors, dubbed CE-Bits, providing an alternative to L-2 and hinge loss learning. Because of the usage of cross entropy, a min-max binary NP-hard problem...
Spin-transfer torque magnetic random access memory (STT-RAM) technology has emerged as a potential replacement of SRAM in cache design, especially for building large-scale and energy-efficient last level caches. Compared with singlelevel cell (SLC), multi-level cell (MLC) STT-RAM is expected to double cache capacity and increase system performance. However, the two-step read/write access schemes incur...
Wide-area-measurement systems (WAMSs) are used in smart grid systems to enable the efficient monitoring of grid dynamics. However, the overwhelming amount of data and the severe contamination from noise often impede the effective and efficient data analysis and storage of WAMS generated measurements. To solve this problem, we propose a novel framework that takes advantage of Multivariate Empirical...
This paper considers training-based transmissions in massive multi-input multi-output (MIMO) systems with one-bit analog-to-digital converters (ADCs). We assume that each coherent transmission block consists of a pilot training stage and a data transmission stage. The base station (BS) first employs the linear minimum mean-square-error (LMMSE) method to estimate the channel and then uses the maximum-ratio...
We present a sublinear version of the dual coordinate ascent method for solving a group of regularized loss minimization problems in machine learning. The proposed method seamlessly integrates sampling techniques, the dual coordinate ascent method, and a multiplicative update algorithm. The sampling techniques choose the "expected" examples, and estimate the corresponding inner products...
In this paper, we investigate low complexity channel state selection algorithms in single input multiple output media-based modulation (SIMO-MBM) based on maximizing the minimum Euclidean distance of constellation. We propose two channel state selection algorithms called CS-MBM and CS-MSBM for SIMO-MBM with only MBM information transmitted and with both MBM and source-based modulation (SBM) information...
Malware authors can easily generate obfuscated and metamorphic malware to evade the detection of anti-virus software using automated toolkits. To identify these variations, we design an efficient system to detect and classify the malicious software. We construct a controlled disassembly files from malware. And we convert disassembly files into gray-scale images. In order to improve the efficiency,...
In this paper, we investigate the performance of a cooperative massive MIMO system where the number of transmit antennas of all base stations (BSs) and the number of users both grow to infinity with a constant ratio. We assume that imperfect channel state information (CSI) and user data are sharing among all the BSs through the wired backbone for regularization zero-forcing (RZF) precoding processing...
Massive multiple-input multiple-output (MIMO) is a potential candidate key technology for the fifth generation of wireless communication systems. In previous research, different power loss and shadowing effects on different individual antenna elements have been neglected. When characterizing the channel of a massive MIMO system and investigating the system performance, the large scale attenuation...
In this paper, a distributed ant colony system (DACS) based on large scale wireless sensor is proposed. The algorithm aims to solve the problem of large scale data transmission in wireless sensor networks from three aspects of the operational efficiency, energy balance and network congestion. The algorithm can optimize the transmission time and provide a more optimal capacity allocation scheme for...
As the increasing demand for information interconnect, the traditional electrical interconnect will encounter a bottleneck on speed and power consumption. As a comparison, optical interconnect can offer better performance considering the above aspects. Multifunctional, high-speed, highly-integrated photonic circuits are necessary for the next generation optical interconnect. Due to the compatible...
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