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The domain decomposition method provides a very effective strategy to solve the complicated multilayer dielectric or composite objects. The original objects are decomposed into many closed sub-domains based on its local material or geometry characteristics. Based on the property of different sub-domains, the JMCFIE, PMCHWT, CFIE-IBC, CFIE or EFIE can be formulated in different sub-domains, properly...
Super-resolution enhancement is a kind of promising approach to enhance the spatial resolution of images. To super-resolve a satisfying result, regularization term design and blur kernel estimation are two important aspects which need to be carefully considered. In this paper, we propose a robust regularized super-resolution reconstruction approach based on two sparsity properties to deal with these...
Avalanche photo-diodes (APD) are widely employed in visible light communication (VLC) systems. Experiments show that under official illuminance APD shot noise can not be ignored due to the multiplication process. Under VLC dual-purpose illumination, symbols on different constellation points inevitably experience different levels of noise. In such a signal dependent noise channel, traditional log likely-hood...
In this mobile era, people cannot live without smart phones. But how smart and trustworthy they are is still a problem. User authentication is one of the most important issues. The prevalent solutions are simple (4-digit) password, regular textbased password, pattern password and fingerprint. However, all of them are one-way authentication and each of them has its own limitations. This paper proposes...
In this paper, the concept of three-dimensional (3-D) space-time shift keying (STSK) is introduced, which incorporates 3-D constellations into conventional STSK systems. The new 3-D STSK techniques enjoy better error resilience than their two-dimensional (2-D) counterparts. Firstly, based on different sampling rates, two three-dimensional (3-D) STSK schemes referred to as R2 3-D STSK and R3 3-D STSK,...
In this paper, an optical orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) system exploiting three-dimensional (3-D) signal mapper is proposed. Both asymmetrically-clipped optical OFDM (ACO-OFDM) and direct-current-biased optical OFDM (DCO-OFDM) are considered, which produce unipolar OFDM signals that can be transmitted through light emitting diodes (LED)....
In this paper, we propose a new precoded multi-user (MU) multiple-input multiple-output (MIMO) optical orthogonal frequency division multiplexing (OOFDM) aided visible light communication (VLC) system. Optical spatial modulation (OSM) and spatial pulse position modulation (SPPM) are utilised for providing uniform indoor illumination and high speed data transmissions. Both OSM and SPPM exploit the...
The performance of long term evolution (LTE) system can be improved by optimizing the downlink channel allocation, while the optimization demands the channel quality indicator (CQI) fed back by the user equipment(UE). However, since the channel is time-varying and there exists CQI feedback delay T, the feedback CQI can't always represent the UE's current channel state, leading to the sub-optimal allocation...
In this paper, we study a hybrid free-space optical/radio-frequency (FSO/RF) communication system deploying protograph-based low-density parity-check (P-LDPC) codes. We use the protograph-based extrinsic information transfer (PEXIT) algorithm to accurately evaluate the system performance and employ the hybrid FSO/RF symbol mapping technique and the generalized variable degree matched mapping (G-VDMM)...
This paper introduces and proposes a novel Continuous Learning and Collaborative Decision Making (CLCDM) mechanism to support the real-time cooperation of affective humanoid service robots in smart home/campus environment, in which many highly complicated and intelligence demanding applications, such as homecare and children education are either currently partly assisted or expected to be fully provided...
In this paper, an integral equation domain decomposition method based on hybrid solvers (HS-DDM) are developed for modeling of electromagnetic radiation problems. Based on the philosophy of ‘divided and conquer’, the IE-DDM divides the original multi-scale problem into many closed non-overlapping sub-domains. The Robin transmission conditions ensure the continuity of the currents across adjacent sub-domains...
In order to solve the field safety monitoring problem about high sulfur-containing natural gas purification plant commissioning test, designed and developed multi-sensor wireless monitoring system, and carried out the field application at Guangyuan gas field natural gas purification plant of SINOPEC. Firstly, introduced designs of multi-sensor wireless monitoring system in details, including the software...
Electromagnetic (EM) scattering from thin coating on conducting objects is a classic topic that arises in many practical application. The complexity of absorbing material application demands for sophisticated and flexible numerical methods. It can be argued that these requirements are even more critical when the cost of building and measuring a real coated object is great. Usually, impedance boundary...
Internet advertising, or E-Marketing, is an important marketing tool in today's on-line world. This study focus on developing a framework for personalized Internet advertisement recommendation service. At first, all the advertisements are categorized by referring to the commercial categories provided by Yahoo. Then, keywords are extracted from each advertisement, and the most correlated keywords to...
Saliency in Context (SALICON) is an ongoing effort that aims at understanding and predicting visual attention. This paper presents a new method to collect large-scale human data during natural explorations on images. While current datasets present a rich set of images and task-specific annotations such as category labels and object segments, this work focuses on recording and logging how humans shift...
In this paper, a new method of constructing three-dimensional (3-D) signal constellations for digital modulation in wireless communication systems is proposed, which is capable of improving the reliability of transmit signals as compared to conventional two-dimensional (2-D) modulation techniques. More specifically, the proposed method for generating 3-D signal constellations can be translated to...
An improved spatial modulation scheme for indoor OWC named generalized optical spatial modulation (GOSM) is proposed, which can significantly improve the BER performance of optical spatial modulation (OSM) especially in highly correlated channel environments.
This paper proposes a fast N:1 protection mechanism for NG-PON2 network. When failures occur the affected ONUs conduct wavelength tuning to realize fast service recovery. We analyzed data loss from protection using a Markov chain model. The numerical results show the fast protection scheme reduces the disconnection time, and ONU configurations of logic connections and service managements are fully...
Maintaining service availability during multi-domain reconfigurations is a challenge in both Internet and software-defined networks (SDNs). During the reconfiguration process, the asynchronous reconfiguration to border routers or switches in different domains will incur the transient problem, contributing to an enormous number of packet losses and service disruptions. According to a recent study [1],...
The vacuum is a kind of ideal insulating media. In general, the breakdown voltage of a vacuum gap increases with the length of the gap. But for large gaps longer than 10 cm, it would be different. It was thought that the breakdown mechanism had been changed with increasing of the length of the gap and the voltage1. A 15 cm wide coaxial gap in vacuum was simulated with the particle-in-cell code UNIPIC...
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