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It is known that the co-prime array should be more attractive for estimating the direction of arrival (DOA) of multiple sources because it can obtain a high system degrees of freedom (DOFs). In this paper, we proposed a vectorized conjugate augmented method which can further increase the DOFs of the array by exploiting the sum co-array based on real-valued sources. Meanwhile, to obtain more available...
In Heterogeneous Computing Systems, completion time and overall fairness are both crucial to multi workflow scheduling. Unfortunately, most dynamic workflow scheduling algorithms fail to take fairness into account or adapt unreasonable fairness policy, which will probably result in some DAGs' scheduling failure in certain scenarios when they can't complete all the tasks before deadline. Aiming at...
Memory intensive workloads become increasingly popular on general purpose graphics processing units (GPGPUs), and impose great challenges on the GPGPU memory subsystem design. On the other hand, with the recent development of non-volatile memory (NVM) technologies, hybrid memory combining both DRAM and NVM achieves high performance, low power and high density simultaneously, which provides a promising...
Phase autofocus is a key step of translational motion compensation (TMC) in inverse synthetic aperture radar (ISAR). In this paper, an effective phase autofocus algorithm for ISAR is proposed based on single eigenvector. Samplings in multiple range bins are used to construct the covariance matrix and obtain the eigenvector corresponding to the largest eigenvalue. It is found that this eigenvector...
The direction of arrival (DOA) estimation is a key issue in array signal processing, and the MUSIC algorithm is a kind of well-known DOA method. In this paper, an extended dimension MUSIC (ED-MUSIC) method is proposed for improving DOA estimation performance. For emitted real valued signals, the received array data is split into real and imaginary parts that are combined into a sampling vector of...
The fault rate of on-load tap-changer (OLTC) has always been in a high level, and that is exactly the primary reason of transformer faults. As a result, an on-line detection method of OLTC was proposed. The embedded platform and wireless sensor network (WSN) technology was introduced into the on-line detection system. WSN was used to obtain OLTC status information. The embedded platform software,...
Aiming at the application problems of wireless sensors in power substation, the wraparound topology of magnetic energy converter is proposed. In high-voltage substations, there is a fairly wide range of the spectrum in the magnetic field components. If magnetic energy converter with better collection efficiency is used as auxiliary power source, it will be able to significantly improve the self-powered...
Insulation parts exist in dc wall bushing. During normal operation, insulation parts through the constant current conduction cannot as ideal insulator, so can't simply calculate the electric field in electrostatic field theory, otherwise cause calculation error, and even made bushing structure design errors. In order to study the ac and dc field different influence on bushing electric field. The calculation...
Energy theft has been a serious and long existing problem facing by many power utilities. The implementation of Advanced Metering Infrastructure (AMI) provides power companies with new means for energy theft detection. As fundamental equipment of AMI, smart meters collect interval measurements from customer sites and thus provide system wide visibility for power companies. Leveraging both AMI and...
A 1-V 23-μW Sigma-Delta ADC for high-accuracy and low-power applications is presented in a standard 0.18-μm CMOS technology. To achieve high accuracy with low power consumption in low voltage environment, the proposed modulator is implemented with a 1-bit 3rd-order topology, in which the input-feedforward structure and switched-opamp technique are combined. Meanwhile, a pseudo RAM architecture is...
The dual feed circularly polarized (CP) U-slot microstrip antenna (MSA) has recently been proposed to provide more than 20% bandwidth that VSWR ≤ 1.5 and AR ≤ 3 dB overlapped, even with very small size. However, the working principles of the antenna and the design rules for it have not been yet presented. In this paper, simple formulations to estimate the resonant frequencies of the dual feed antenna...
A circularly polarized (CP) Microstrip Yagi array antenna (MSYA) is designed in order to achieve high front-to-back ratio R(F/B) and wide beamwidth radiation pattern. Two coaxial feeds with same magnitude and different phase is used to excite the antenna. Parametric studies are carried out to investigate the effects of some key geometrical sizes on the antenna's performance. The overlapped band that...
What types of information are popularly shared on social media sites such as Facebook, Twitter, Linked In and Google+? Does each of the social network cares about different topics? Can we uncover the different patterns behind the sharing behavior of social network users? This paper addresses the above questions by analyzing public information spreading data on different online social networks, identifying...
Efficient application scheduling algorithms are important to obtain high performance in heterogeneous computing systems. However, most of current algorithms are of low efficiency in scheduling. Aiming at this problem, we propose a heterogeneous scheduling algorithm with improved task priority (HSIP) whose functionality relies on two pillars: 1) a task priority strategy based on standard deviation...
Recent years, social network has attracted many attentions from research communities in data mining, social science and mobile etc, since users can create different types of information due to different actions and the information gives us the opportunities to better understand the insights of people's social lives. Co-clustering is an important technique to detect patterns and phenomena of two types...
How to maximize influence through social networks is a key challenge behind many important applications in real life. For instance, marketers are interested in how to use limited resource to promote a new product as widely recognized by consumers. In recent years, researchers have conducted numerous studies to conquer this intriguing problem in single network scenario. In terms of the scale of achieved...
The DOA estimation is a key issue in array signal processing, and there are many effective methods, e.g., Capon, MUSIC and Capon-MUSIC algorithms, in the literature. Nevertheless, there is less compare between the DOA estimation methods and the CRB of closely spaced multiple sources with large power differences. In this paper, it is compared between the three kinds of DOA estimation algorithms and...
Checkins, the niche service provided by location based social networks (LBSN), bridge users' online activities and offline social lives in a seamless way. Therefore, knowledge discovery on check in data has become an important research direction [1], [2], [3], [4]. However, a fundamental and interesting question about checkins remains unanswered yet. What are people's motivations behind those checkins?...
Recommending valuable videos to viewers is always crucial to an online video website and its related third parties. More particularly, what features and methods to be selected to assess the quality of online videos is still an on-going research topic. Unlike previous work attempted to evaluate a video only by its view count (a.k.a. popularity), this article proposes an additional scoring mechanism...
A compact microstrip-fed dual-band printed antenna for wireless local area network (WLAN) applications is proposed in the current letter. The antenna is composed of a C-shaped radiation patch and a modified rectangular ground lane. Through proper adjustment of angle of two arms of C-shaped radiation patch, dual desired resonance frequencies are generated. The presented antenna exhibits a great independence...
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