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We present here a fundamental understanding of the capacity of wireless ad hoc networks. Under the assumption that all interference is essentially regarded as noise, we try to answer the question: “What is the lower bound on network capacity under a certain power assignment and nodal distribution?” We give two quantitative lower bounds: one is measured in bps (bits per second), the other is measured...
In this summary, the resistive random access memory (RRAM) with the structure of Pt/HfO2/Ti is investigated for applications in radiation circumstance. The heavy ion 86Kr26+ of HIRFL (The Heavy Ion Research Facility in Lanzhou) is used as the radiation source. The energy of 86Kr26+ is 25 MeV/u, the LET is 37.6 MeV/(cm2/mg), and the fluence of 5e11 is achieved after 2 hours radiation. Basic performance...
Passive Optical Network (PON) is the most promising technology in optical access network, and the effective and reasonable upstream dynamic bandwidth allocation (DBA) is the key. This paper proposes a new software defined WDM-TDM PON frame that enable more users to share a single high-capacity fiber access as well as introduce a flexible DBA module to replace the hardware-configured DBA module. The...
Motivated by reduction of computational complexity, this work develops a pipelined adaptive filter architecture using the sign-error least mean square (LMS) algorithm. The calculation consumed for the proposed algorithm was less than half of the conventional architectures. Besides, the proposed designs derived by retiming technique and with low latency also provide a faster convergence and a higher...
This paper presents a novel active synchronization control strategy of multi-bus microgrid based on distributed cooperation technology. The method can reconnect microgrid back to utility grid (UG) seamlessly with sparse communication channels. Through the cross product of voltage vectors in the synchronizer, the frequency and phase of microgrid can track the main grid simultaneously. The voltage differences...
Aspect angle estimation of the targets is of great help to computational reduction for template-based synthetic aperture radar (SAR) automation target recognition (ATR) algorithms. An effective aspect angle estimation algorithm of targets in SAR images based on sparse representation is proposed in this paper. The spare vector is firstly obtained under the dictionary which is constructed by all the...
Processor operating at near-threshold voltage shows improved energy efficiency across many applications. This paper describes a 40nm 0.6V standard cell library used in the implementation of a secure hash algorithm (SHA) accelerator core. An improved cell sizing scheme has been proposed. Validation of single cell show better static noise margin and delay variation under process variation at ultra-low...
Neural-machine interface (NMI) decoding errors challenge the clinical value of neural control of powered artificial legs, because these errors can dangerously disturb the user's walking balance, cause stumbles or falls, and thus threaten the user's confidence and safety in prosthesis use. Although extensive research efforts have been made to minimize the NMI decoding error rate, none of the current...
Above knee amputees exhibit a higher risk of falling than able-bodied people, so the capacity to recover from trips (a major cause of unintentional falls) is critical for these amputees to prevent fall-related injuries. Although trip recovery approaches using powered prostheses have been proposed, the effectiveness of these approaches has not been evaluated with varied trip-related disturbance levels...
In this study, we developed and tested a novel adaptive controller for powered transfemoral prostheses. Adaptive dynamic programming (ADP) was implemented within the prosthesis control to complement the existing finite state impedance control (FS-IC) in a prototypic active-transfemoral prosthesis (ATP). The ADP controller interacts with the human user-prosthesis system, observes the prosthesis user's...
Powered knee prostheses provide substantial advantages for amputees compared to traditional passive devices during basic walking tasks (i.e. level-ground, stairs, ramps), but the impedance control parameters are fixed. For environments that differ from the well-controlled setting of the clinic, amputees must compensate their gait patterns because fixed control parameters ideal for walking on level...
New control methods are presented in this paper for a hopping single-legged robot in the 2D plane. It is aimed to keep the robot's movement stably, namely kinematic parameters oscillating in a small range. Body angle, hopping height and horizontal velocity respectively represent the control parameters of three degrees of freedom. Finally, a series of simulation experiments show that all the kinematic...
The motion errors of bistatic synthetic aperture radar (BiSAR) are still considerable after traditional phase gradient autofocus (PGA) for bistatic SAR in some situations, and the residual range-dependent phase errors are still too large to cause defocusing. To overcome the problem, a modified PGA algorithm is proposed in this paper to deal with the range-dependent phase errors for one-stationary...
With simultaneous transmission on both uplink and downlink within the same band, full duplex (FD) wireless communication is an emerging technique for next generation networks to significantly improve network throughput and spectrum efficiency. The symmetric capacity in the FD wireless network come from the same throughput obtained in both uplink and downlink with the same bandwidth. However, it will...
A 4K×2K video processor supporting 360-degree video recording over the smart-phone is first-reported. Two 180° fisheye cameras are exploited to stitch the circle video into a panorama one. Fast stitching algorithms reused the neighboring pixel and reduce the unused operating area while keep high stitching quality, and therefore achieve 4K real-time recording over 2.5GHz octa-core ARM CPU and Power...
In device-to-device (D2D) underlaying cellular networks, the interference among spectrum-sharing links is a major obstacle to reaping the potential benefits of D2D communications. To overcome this problem, we focus on joint optimization of resource sharing and power control for D2D-enabled cellular networks in a general resource reuse scenario, aiming at maximizing the overall throughput of D2D communications...
In this paper, the characteristics of the set time (tset) correlated with the initial off-state resistance (Roff) were studied using a statistical method based on a Ti/ZrO2/Pt RRAM device. The data were collected by the width-adjusting pulse operation (WAPO) method. The Weibull distribution is used to analyze tset variation. Both the Weibull slope (βt) and scale factor (tset63%) of tSet distributions...
Controllable shunt reactors are categorized into the following two types: magnetically saturation controlled shunt reactors (MCSR) and transformer type controllable shunt reactors (TCSR), EHV transmission lines generally employ TCSRs that feature smaller harmonic currents, faster response and less power losses. Adjusting the capacity of TCSR causes differential current changes. This poses challenges...
Satellite remote sensing can provide repeat and detail observations, which has played an important role on the disaster management. Different with the existing satellites, GF—4, which works on the geosynchronous orbit and carry on a camera with 50 meter spatial resolution in visible and NIR bands, can give a continuous earth observation. It is the highest spatial resolution among the civil satellite...
The healthcare industry is changing at a dramatic rate. There are multiple processes going on within the health sector. These processes not only impact the care of individuals but also help medical practitioners and the delivery of care and services. The industry can take advantage of big data analytics to ensure that all the multiple processes within the industry are running smoothly. Big data analytics...
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