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Graphical passwords have been proposed as a possible alternative to text-based schemes, but graphical passwords, in storage and communication, require much more storage space than text based passwords, and network transfer delay is also a concern for them. An idea of "graphical structure plus number theory" (GSPNT) for designing new type of passwords is an alternative to typical graphical...
A voltage-controlled oscillator (VCO) for 5-GHz band application is presented in this paper. The VCO is designed for low voltage-supply, low power consumption, low phase noise and large tuning range based on TSMC 0.35μm SiGe BiCMOS process. To analyze the noise, the noise model of this design is deduced. The center frequency of VCO is 5.5GHz and oscillation frequency range is from 5.1 GHz to 5.9 GHz,...
This paper presented the research on heat load prediction method of central heating system. The combined simulation data at Xi'an in January was used as the samples for training and predicting. This paper selected the daily average outdoor wind speed, the daily average outdoor temperature, date type, sunshine duration as input variables and the heating load value as output variable. After preprocessing...
It has been observed through animal and cell experiments that terahertz electric pulse irradiation can modulate physiological processes of nerve system. However, the regulation mechanism is unclear and the corresponding research is rarely reported in the literatures. This paper simulates the voltage-activated calcium flux of rodent neuroblastoma cells under the irradiation of 50ps, 2.5THz electric...
Terahertz technology shows great potential in the field of biology and medicine. In order to study the impact of terahertz electrical field on the KcsA membrane protein system at the molecular level, we perform molecular dynamics (MD) simulations to simulate this process. Two kinds of waveforms are chosen, sine wave and square wave. The frequencies are respectively 0.5T, 1T, 2T and 3T. We compare...
A W-band backward wave oscillator (BWO) based on metamaterial (MTM) slow wave structure (SWS) is presented as a novel high power microwave generator. Particle-in-cell (PIC) simulation is performed to evaluate the efficiency of the W-band MTM-based BWO (MTMBWO), and the MTMBWO can reach saturated output power of 2.78MW with an electronic efficiency of 31.68% at frequency of 84.87GHz.
In view of the complex and special structure of the yokeless and segmented armature machine (YASA), this paper presents optimal design of a 22kW YASA to increase the torque density and reduce the cogging torque. The initial design dimensions are proposed by sizing equation and the 3D finite- element analysis (FEA). Then, the parameters such as the outer diameter, ratio of inner and outer diameter,...
Cryptography has been around for thousands of years. We propose a new cryptographic model, lock trees and key trees, and our idea differs from current graphical passwords in this paper. Graphs and their labellings are applied to establish the concepts of key-trees and lock-trees based on abundant of graphs having smaller orders and their corresponding double odd-edge labellings. We propose two methods,...
A 0.38THz Traveling Wave Tube (TWT) based on the sine waveguide and sheet beam tunnel is proposed to amplify the terahertz wave. In this paper, the high frequency characteristics of sine waveguide with sheet beam tunnel are calculated by 3-D high frequency simulation software. From the particle-in-cell simulation results, this beam-wave interaction can produce output power 13W at 0.38THz, and the...
The collision problem in the multiple Radio Frequency Identification (RFID) reader environment could cause the loss of data, and leads to the decrease of the time-efficiency and energy-efficiency of RFID system. To solve this problem, we propose a task model based on the resource competition to indicate the collision in RFID system, and present a new reader scheduling algorithm based on the reader's...
A random phase-shifted fiber Bragg grating has been theoretically analysed by the transfer matrix method. Numerical predictions of the effects of phase-shifted points on the reflection spectra of such a grating are calculated. This fiber Bragg grating with 10 random phase-shifted points distributed has been fabricated. These predictions are compared with experimentally measured spectra of the random...
Much attention has been paid to the diagonal flips in maximal planar graphs. In this paper, we firstly focus on the properties of the unflippable edges in maximal planar graphs, and propose the concept of K4-embedding. Also, we prove that for a maximal planar graph G with order n(⋝ 5), an edge e ∊ E(G) is unflippable if and only if e is either incident to a 3-degree vertex or a supporting edge of...
The connectivity of large scale complex networks relies on a specific small set of structural nodes which is called the core of the whole network. The influence maximization problem is to identify such set of nodes, known as influencers, who can trigger the maximum range of information propagation in a network, which is one of the most important problems in network science. In this paper, we introduce...
We propose an index of textural feature for oil spill segmentation based on X-band marine radar image. The radar image used in this paper were acquired on July 21, 2010, from the teaching-training ship, “YUKUN”, of Dalian Maritime University. Using adaptive median filter and Fields-of-Experts model, co-channel interference and small objects are cleaned separately. An index calculated by textural features...
Current methods that use hyperspectral remote sensing imagery in the detection and extraction of marine oil spills are quite popular. Because the mixed pixels exist broadly in the hyperspectral images, the automatic and accurate end member extraction technology plays most essential role in the hyperspectral unmixing. This paper proposed a data field-spectral preprocessing module prior to end member...
Marine radar can be applied to detect oil spill targets in a large range, which cannot be affected by night, cloudy, rain, snow and other inclement weather. It has played an important role in the field of oil spill monitoring. Moreover, marine radar has the advantages of low cost and convenient installation, which is suitable for constructing marine oil spill network monitoring system. Taking marine...
In this paper, a tunable and cascaded Brillouin-erbium random fiber laser (RFL) has been proposed and experimentally investigated. The scheme of a half-open cavity is used to provide random distributed feedback (RDFB). The results show the proposed RFL has one to four Stokes lines when 980 nm pump power increases from 130 mW to 297 mW and Brillouin pump is equal to 2 mW. Output lasing wavelengths...
A high-accuracy cascade sigma-delta A/D-converter is presented. This A/D-converter consists of a 4th-order sigma-delta modulator with 2–2 cascade topology(two stages, both are 2nd-order modulators), a 5th order digital decimation filter, the bias circuit and the clock circuit. The 4th-order sigma-delta modulator is designed using a novel transfer function, that enables the modulator to process the...
When the code length is moderate, non-binary low-density parity-check (NB-LDPC) codes can achieve better error correcting performance than their binary counterparts at the expense of higher decoding complexity. The check node processing is a major bottleneck of NB-LDPC decoding. In this paper, Min-max decoding algorithm is proposed based on a new forward backward processing method of check nodes,...
Coordinated multi-point transmission can provide high spectral efficiency for cellular systems. However, along with the increment in the amount of data, backhaul gradually becomes the bottleneck in terms of system performance and cost. In this paper, the backhaul delay is mainly focused in coordinated cellular networks and a hybrid channel prediction (HCP) algorithm is proposed. This algorithm combines...
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