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Recently, contactless manipulation of immersed objects has garnered great interest. Specifically, acoustic manipulation in microfluidic channels has emerged as a tool to control micron-sized objects in chemical, medical, and biological applications. Pure and controllable acoustic forces of the acoustic manipulation method exhibit a minor negative impact on viability and functionality of biological...
Video summarization (VS) is one of key video signal processing techniques for unmanned aerial vehicles (UAVs). Essentially VS aims at eliminating redundant frames in aerial videos (AVs) with high similarity, which is helpful for quick browsing, retrieving and efficient storage without losing important information. For VS technique, how to measure the similarity between video frames is not a trivial...
A marginal utility based base station (BS) sleeping spatial adaptive play (SAP) algorithm is proposed to study base station sleeping strategy considering user preference and base station load. Based on the marginal utility, a potential game model is proposed, which is proved to be an exact potential game. The optimum solution of network energy efficiency is one of Nash Equilibria of the exact potential...
Civil aircraft air conditioning system (ACS) is a key system in aircraft, the system conditions monitoring and health management technology is the breakthrough key technical of the domestic civil aircraft operators support. With civil aircraft ACS as the object, combined with ACS existing monitoring parameters system and the route common failure mode, this paper proposes a method of civil aircraft...
Asymmetric structure damage such as loss of wing tip can cause unknown changes to the aircraft mass, center of gravity and aerodynamic characteristics, which will make the whole system becomes difficult to control. Aiming at this problem, this paper presents a robust fault-tolerant control strategy based on nonlinear extended state observer and gain preset PID (Proportion Integration Differentiation)...
The purpose of this study was to investigate the mediating role of opportunity identification on the relationship between Social networks and entrepreneurial performance by using the method of Structural equation model (SEM). The study involved 136 valid questionnaires of internet entrepreneurs in Zhejiang province of China. The results show that the structure characteristics and relationship characteristics...
GNSS is capable of providing high-precision and drift-free attitude information. The traditional attitude determination methods based on the baseline vector and carrier phase measurement process attitude determination estimation and ambiguity resolution sequentially. And the redundant measurements from multi-baselines have not been fully utilized. A GNSS measurements based attitude determination method...
This Various kinds of parameters is widespread in the field of the software which constitutes business foundation. Based on the parameter variability and life cycle characteristics, highly efficient and flexible information management system of the parameters is weaken. In the process of parameters management, it is a worthy problem to research deeply that involving parameters into the full life cycle...
This paper proposes a robust tracking method with application to the DC-AC PWM converter of the green energy. The proposed method has the merits of hyperbolic tangential sliding hyperplane (HTSH), grey prediction (GP) and firefly algorithm (FA). The HTSH has the robustness of classical sliding mode control (SMC) and increases the system's convergence speed. However, once a highly nonlinear load occurs,...
Novel epoxy nanocomposites are fabricated by using 3D interconnected boron nitride nanosheets (BNNSs). The nanocomposites exhibit ultrahigh thermal conductivity enhancement and suppressed dielectric loss at low BNNS loading. Furthermore, the obtained nanocomposites have high electrical insulation performance, showing potential applications in high power LED, advanced packaging materials and microelectronic...
Streaming media technology is that continuous media transmits in the network using stream technology. It supports playing of audio and video files while they are being downloaded. So that users feel as smooth as playing local files when they broadcast network file. Due to that the amount of data of the audio and video files is very large, real-time broadcast is not an easy thing. It needs for data...
Based on an electromagnetic band-gap (EBG) structure, the compact four-element MIMO antenna are proposed for 2.4 GHz band application, with antenna area of 0.72 × 0.72 λ2 and high isolation level of −15 dB. To isolate the four elements in compact space, a concentric square ring mushroom EBG (CSR-EBG) which reduce cell size by 45% in comparison to the conventional EBG is designed. The effective arrangement...
In this paper, we study the secrecy performance of cooperative single carrier system with the kth-best user selection scheme in Rayleigh fading channels. Assuming perfect decoding at the relay, we choose the legitimate user with the kth-best instantaneous signal-to-noise ratio (SNR) among Q users to receive the forwarded messages, which are intercepted at a passive eavesdropper simultaneously. To...
The complete spatiotemporal dynamics in an octave-spanning oscillator is captured to further optimize its transform-limited pulse duration and beam profile for simultaneous short pulse generation and CEP locking.
Confronted with the rapidly increasing demand of mobile traffic and heavy energy consumption on base stations (BSs), the base station (BS) sleeping strategy becomes a promising method to promote the system energy efficiency (EE). To switch off the redundant small-cell base stations (s-BSs) without whittling down the network EE in small cell networks, we propose a novel environment-friendly distributed...
Wireless capsule endoscopy video summarization (WCE-VS) is highly demanded for eliminating redundant frames with high similarity. Conventional WCE-VS methods extract various hand-crafted features as image representations. Researches show that such features only reflect the low-level characteristics of single frame and essentially are not effective to capture the semantic similarity between WCE frames...
It is critical yet remains to be challenging to make right disease diagnosis based on complex clinical characteristic and heterogeneous genetic background. Recently, Human Phenotype Ontology (HPO)-based phenotype similarity has been widely used to aid disease diagnosis. However, the existing measurements are revised based on the Gene Ontology-based term similarity models, which are not optimized for...
Automatic link establishment (ALE) is one of the important technologies in HF communication. One of the indicators to measure the performance of an ALE system is the linking time, which includes channel switching, spectrum sensing, and trying to call three periods. Asynchronous mode has been widely used for its simple operation. When establishing an link, the station sorts all the channels and selects...
In order to study the (√3×√3) R30°(abbr.√3) and (3×3) reconstruction structures on 6H-SiC (0001) -Si terminal after S atoms adsorption, the first-principles calculations were performed to investigate the properties of surface adsorption energy, bond lengths, bond angles, density of states, and bond population. The results show that S atoms can open the reconstruction bonds on 6H-SiC surfaces. TOP...
Significant shifts in threshold voltage have been observed during 10-keV X-ray irradiation of passivated and unpassivated AlGaN/GaN HEMTs. Oxygen and hydrogen impurities are found to contribute to differences in threshold voltage shifts and transconductance degradation for the passivated and unpassivated devices.
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