查看更多>>摘要：Non-intrusive load monitoring(NILM)can infer the status of the appliances in operation and their energy consumption by analyzing the energy data collected from monitoring devices.With the rapid in-crease of electric loads in amount and type,the tradition-al way of uploading all energy data to cloud is facing enormous challenges.It becomes increasingly significant to construct distinguishable load signatures and build ro-bust classification models for NILM.In this paper,we propose a load signature construction method for load re-cognition task in home scenarios.The load signature is based on the Gramian angular field encoding theory,which is convenient to construct and significantly reduces the data transmission volume of the network.Moreover,edge computing architecture can reasonably utilize com-puting resources and relieve the pressure of the server.The experimental results on NILM datasets demonstrate that the proposed method obtains superior performance in the recognition of household appliances under insuffi-cient resources.
查看更多>>摘要：The similarity detection between two cross-platform binary functions has been applied in many fields,such as vulnerability detection,software copyright protection or malware classification.Current advanced methods for binary function similarity detection usually use semantic features,but have certain limitations.For example,practical applications may encounter instruc-tions that have not been seen in training,which may eas-ily cause the out of vocabulary(OOV)problem.In addi-tion,the generalization of the extracted binary semantic features may be poor,resulting in a lower accuracy of the trained model in practical applications.To overcome these limitations,we propose a double-layer positional encoding based transformer model(DP-Transformer).The DP-Transformer's encoder is used to extract the semantic fea-tures of the source instruction set architecture(ISA),which is called the source ISA encoder.Then,the source ISA encoder is fine-tuned by the triplet loss while the tar-get ISA encoder is trained.This process is called DP-MIRROR.When facing the same semantic basic block,the embedding vectors of the source and target ISA en-coders are similar.Different from the traditional trans-former which uses single-layer positional encoding,the double-layer positional encoding embedding can solve the OOV problem while ensuring the separation between in-structions,so it is more suitable for the embedding of as-sembly instructions.Our comparative experiment results show that DP-MIRROR outperforms the state-of-the-art approach,MIRROR,by about 35％in terms of precision at 1.
查看更多>>摘要：Software trustworthiness is an essential criterion for evaluating software quality.In component-based software,different components play different roles and different users give different grades of trustworthi-ness after using the software.The two elements will both affect the trustworthiness of software.When the software quality is evaluated comprehensively,it is necessary to consider the weight of component and user feedback.Ac-cording to different construction of components,the dif-ferent trustworthiness measurement models are estab-lished based on the weight of components and user feed-back.Algorithms of these trustworthiness measurement models are designed in order to obtain the corresponding trustworthiness measurement value automatically.The feasibility of these trustworthiness measurement models is demonstrated by a train ticket purchase system.
查看更多>>摘要：Because a significant number of al-gorithms in computational science include search chal-lenges and a large number of algorithms that can be transformed into search problems have garnered signific-ant attention,especially the time rate and accuracy of search,a quantum walk search algorithm on hypergraphs,whose aim is to reduce time consumption and increase the readiness and controllability of search,is proposed in this paper.First,the data points are divided into groups and then isomorphic to the permutation set.Second,the ele-ment coordinates in the permutation set are adopted to mark the position of the data points.Search the target data by the controllable quantum walk with multiparticle on the ring.By controlling the coin operator of quantum walk,it is determined that search algorithm can increase the accuracy and controllability of search.It is determ-ined that search algorithm can reduce time consumption by increasing the number of search particles.It also provides a new direction for the design of quantum walk algorithms,which may eventually lead to entirely new al-gorithms.
查看更多>>摘要：In the traditional quantum wolf pack al-gorithm,the wolf pack distribution is simplified,and the leader wolf is randomly selected.This leads to the prob-lems that the development and exploration ability of the algorithm is weak and the rate of convergence is slow.Therefore,a quantum wolf pack evolutionary algorithm of weight decision-making based on fuzzy control is pro-posed in this paper.First,to realize the diversification of wolf pack distribution and the regular selection of the leader wolf,a dual strategy method and sliding mode cross principle are adopted to optimize the selection of the quantum wolf pack initial position and the candidate leader wolf.Second,a new non-linear convergence factor is adopted to improve the leader wolf's search direction operator to enhance the local search capability of the al-gorithm.Meanwhile,a weighted decision-making strategy based on fuzzy control and the quantum evolution com-putation method is used to update the position of the wolf pack and enhance the optimization ability of the al-gorithm.Then,a functional analysis method is adopted to prove the convergence of the quantum wolf pack al-gorithm,thus realizing the feasibility of the algorithm's global convergence.The performance of the quantum wolf pack algorithm of weighted decision-making based on fuzzy control was verified through six standard test func-tions.The optimization results are compared with the standard wolf pack algorithm and the quantum wolf pack algorithm.Results show that the improved algorithm had a faster rate of convergence,higher convergence precision,and stronger development and exploration ability.
查看更多>>摘要：This work presents a novel plane-based area-saving control bus design with distributed registers in 3D NAND flash memory.99.47％control signal rout-ing wires are reduced compared to the conventional con-trol circuit design.Independent multi-plane read is com-patible with the existing read operations thanks to the re-gister addresses are reasonably assigned.Furthermore,power-saving register group address-based plane gating scheme is proposed which saves about 2.9 mW bus tog-gling power.A four-plane control bus design with 20K-bits registers has been demonstrated in field program-mable gate array tester.The results show that the plane-based control bus design is beneficial to high-performance 3D NAND flash memory design.
查看更多>>摘要：Graphene solution-gated field effect tran-sistors(G-SgFETs)have been widely developed in the field of biosensors,but deficiencies in their theories still exist.A theoretical model for G-SgFET,including the three-terminal equivalent circuit model and the numeric-ally calculating method,is proposed by the comprehens-ive analyses of the graphene-liquid interface and the FET principle.Not only the applied voltages on the electrode-pairs of gate-source and drain-source,but also the nature of graphene and its derivatives are considered by analys-ing their influences on the Fermi level,the carriers'con-centration and mobility,which may consequently affect the output drain-source current.To verify whether it is available for G-SgFETs based on different method pre-pared graphene,three kinds of graphene materials which are liquid-phase exfoliated graphene,reduced graphene oxide(rGO),and tetra(4-aminophenyl)porphyrin hy-bridized rGO are used as examples.The coincidences of calculated output and transfer feature curves with the measured ones are obtained to confirm its adaptivity for simulating the basic G-SgFETs'electric features,by mod-ulating Fermi level and mobility.Furthermore,the model is exploited to simulate G-SgFETs'current responding to the biological functionalization with aptamer and the de-tections for circulating tumor cells,as a proof-of-concept.The calculated current changes are compared with the ex-perimental results,to verify the proposed G-SgFETs'model is also suitable for mimicking the bio-electronic re-sponding,which may give a preview of some conceived G-SgFETs'biosensors and improve the design efficiency.
查看更多>>摘要：The passsive noise-shaping successive ap-proximation register(NS-SAR)analog-to-digital convert-er(ADC)demonstrates high performance in resolution improvement,power reduction,and process scaling,while its charge-sharing loss and limited bandwidth weaken the noise-shaping effect.This paper presents a first-order NS-SAR ADC based on error-feedback(EF)structure to realize high-efficiency noise shaping.It employs a lossless EF path by using a set of ping-pong switching capacitors with passive signal-residue summation technique.The proposed first-order EF NS-SAR prototype can be pro-moted to multi-order structure with the minor modifica-tion.Verified by simulation in 65-nm CMOS process,the proposed 9-bit NS-SAR ADC consumes 183.66 μW when operating at 20 MS/s with the supply voltage of 1.2 V.At the oversampling ratio of 16,it achieves a peak signal-to-noise-and-distortion ratio of 81 dB,yielding Schreier fig-ure of merit of 176.32 dB.
查看更多>>摘要：A high-efficiency waveguide slot array antenna with low sidelobe level(SLL)is investigated for W-band applications.The silicon micromachining techno-logy is utilized to realize multilayer antenna architecture by three key steps of selective etching,gold plating and Au-Au bonding.The radiating slot based on this tech-nique becomes thick with a minimum thickness of 0.2 mm and accompanies with the decrease of slot's radiation abil-ity.To overcome this weakness,a stepped radiation cav-ity is loaded on the slot.The characteristic of cavity-loaded slot is investigated to synthesize the low-SLL ar-ray antenna.The unequal hybrid corporate feeding net-work is constructed to achieve sidelobe suppression in the E-plane.A pair of 16×8 low-SLL and high-effciency slot arrays is fashioned and confirmed experimentally.The bandwidth with the radiation effciency higher than 80％is 92.3-96.3 GHz.The SLLs in both E-and H-planes are be-low-19 dB.
查看更多>>摘要：The theory of mechanical antenna is still in its infancy at present,and its radiation mechanism,field distribution,modulation methods and other basic theories need to be explored and improved.The radi-ation mechanism of a rotating-magnet based mechanical antenna(RMBMA)is explored.An equivalent radiation model of the mechanical antenna is established.The field formula of mechanical antenna is derived using this mod-el and rotation matrix.The spatial direct modulation method of mechanical antenna is also investigated.Two prototype antennas are fabricated using DC/AC servo motors and NdFeB magnets,and experiments are carried out to verify the correctness of the derivation and analys-is.The measured and simulated results are in consistent with each other.By precisely controlling the moving parameters of an AC servo motor,signal of binary amp-litude shift keying(BASK)is generated,and the original code sequence is recovered by demodulation.
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