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| 1 | A survey of network anomaly visualization显示文摘Network anomaly analysis is an emerging subtopic of network security. Network anomaly refers to the unusual behavior of network devices or suspicious network status. A number of intelligent visual tools are developed to enhance the ability of network security analysts in understanding the original data, ultimately solving network security problems. This paper surveys current progress and trends in network anomaly visualization. By providing an overview of network anomaly data, visualization tasks, and applications, we further elaborate on existing methods to depict various data features of network alerts, anomalous traffic, and attack patterns data. Directions for future studies are outlined at the end of this paper. | Tianye ZHANG Xumeng WANG Zongzhuang LI Fangzhou GUO Yuxin MA Wei CHEN | 2017 | Science China(Information Sciences)2017，60，12： | 3 |
| 2 | Real-time monitoring of optimum timing for harvesting fresh tea leaves based on machine vision显示文摘The harvesting time of fresh tea leaves has a significant impact on product yield and quality.The aim of this study was to propose a method for real-time monitoring of the optimum harvesting time for picking fresh tea leaves based on machine vision.Firstly,the shapes of fresh tea leaves were distinguished from RGB images of the tea-tree canopy after graying with the improved B-G algorithm,filtering with a median filter algorithm,binary processing with the Otsu algorithm,and noise reduction and edge smoothing using open and close operations.Then the leaf characteristics,such as leaf area index,average length,and leaf identification index,were calculated.Based on these,the Bayesian discriminant principle and method were used to construct a discriminant model for fresh tea-leaf collection status.When this method was applied to a RGB tea-tree canopy image acquired at 45°shooting angle,the fresh tea-leaf recognition rate was 90.3%,and the accuracy for fresh tea-leaf harvesting status was 98%by cross validation.Hence,this method provides the basic conditions for future tea-plantation operation and management using information technology,automation,and intelligent systems. | Liang Zhang Hongduo Zhang Yedong Chen Sihui Dai Xumeng Li Kenji Imou Zhonghua Liu Ming Li | 2019 | International Journal of Agricultural and Biological Engineering2019，12，1： | 2 |
| 3 | Uniform, fast, and reliable CMOS compatible resistive switching memory显示文摘Resistive switching random access memory(RRAM) is considered as one of the potential candidates for next-generation memory. However, obtaining an RRAM device with comprehensively excellent performance, such as high retention and endurance, low variations, as well as CMOS compatibility, etc., is still an open question. In this work, we introduce an insert TaO_(x) layer into HfO_(x)-based RRAM to optimize the device performance. Attributing to robust filament formed in the TaO_(x) layer by a forming operation, the local-field and thermal enhanced effect and interface modulation has been implemented simultaneously. Consequently, the RRAM device features large windows(> 10^(3)), fast switching speed(-10 ns), steady retention(> 72h), high endurance(> 10^(8) cycles), and excellent uniformity of both cycle-to-cycle and device-to-device. These results indicate that inserting the TaO_(x) layer can significantly improve HfO_(x)-based device performance, providing a constructive approach for the practical application of RRAM. | Yunxia Hao Ying Zhang Zuheng Wu Xumeng Zhang Tuo Shi Yongzhou Wang Jiaxue Zhu Rui Wang Yan Wang Qi Liu | 2022 | Journal of Semiconductors2022，43，5： | 1 |
| 4 | Reliable ferroelectricity down to cryogenic temperature in wakeup free Hf_(0.5)Zr_(0.5)O_(2)thin films by thermal atomic layer deposition显示文摘The performance and reliability of ferroelectric thin films at temperatures around a few Kelvin are critical for their application in cryo-electronics.In this work,TiN/Hf_(0.5)Zr_(0.5)O_(2)/TiN capacitors that are free from the wake-up effect are investigated systematically from room temperature(300 K)to cryogenic temperature(30 K).We observe a consistent decrease in permittivity(εr)and a progressive increase in coercive electric field(Ec)as temperatures decrease.Our investigation reveals exceptional stability in the double remnant polarization(2P_(r))of our ferroelectric thin films across a wide temperature range.Specifically,at 30 K,a 2P_(r)of 36μC/cm^(2)under an applied electric field of 3.0 MV/cm is achieved.Moreover,we observed a reduced fatigue effect at 30 K in comparison to 300 K.The stable ferroelectric properties and endurance characteristics demonstrate the feasibility of utilizing HfO_(2)based ferroelectric thin films for cryo-electronics applications. | Shuyu Wu Rongrong Cao Hao Jiang Yu Li Xumeng Zhang Yang Yang Yan Wang Yingfen Wei Qi Liu | 2024 | Journal of Semiconductors2024，45，3： | 0 |
| 5 | A neuromorphic core based on threshold switching memristor with asynchronous address event representation circuits显示文摘The full memristive network hardware features high density and excellent scalability.However,recent researches on the full memristive network have been limited to a single-layer network,due to the lack of effective and flexible communication between neurons.In this design,we demonstrate a neuromorphic core based on Ag/SiO_(2)/Au threshold switching memristor,which has built-in asynchronous address event representation(AER)circuits to provide flexible communication between neurons.Since temporally sparse spikes are the medium of communication between neurons,the AER circuits are designed to transmit spikes serially which have been encoded with neurons’addresses before transmission.With the asynchronous circuits design,the AER circuits will detect neurons’output in real-time.To test the performance of the neuromorphic core,we designed a behavioral simulator for the neuromporphic core to simulate the liquid state machine(LSM)network,which achieves a 100%recognition rate in the free spoken digital dataset.The simulation results show that the neuromorphic core obtains 35 times higher performance than the CPU and111 times higher energy efficiency than the GPU. | Jinsong WEI Jilin ZHANG Xumeng ZHANG Zuheng WU Rui WANG Jian LU Tuo SHI Mansun CHAN Qi LIU Hong CHEN | 2022 | Science China(Information Sciences)2022，65，2： | 0 |
| 6 | Modulating 3D memristor synapse by analog spiking pulses for bioinspired neuromorphic computing显示文摘Memristor based artificial synapses have demonstrated great potential for bioinspired neuromorphic computing in recent years.To emulate synaptic functions, such as short-term plasticity and long-term potentiation/depression, square pulses or combined complex pulse groups are applied on the device. However, in biological neuron systems, the action potentials are analog pulses with similar amplitudes. Furthermore, in biological systems, the intensity of the stimulus is coded into the frequency of action potentials to modulate the weight of synapses. Toward this programming method, we applied a series of analog spiking pulses with same peaks on Ru/TiO_x/TiN 3D memristor to emulate synaptic functions, such as long-term potentiation/depression and synaptic saturation. Moreover, we demonstrated the conductance change of the device under different stimulus frequencies of analog spiking pulses and described the statistical results of conductance change value, which shows that the device conductance has a larger change value under a higher spiking frequency with identical pulse number. These results show that the analog spiking pulses can well modulate the memristor-based synaptic weight and have a great potential for bioinspired computing in the future. | Qi Liu XuMeng Zhang Qing LUO XiaoLong Zhao HangBing Lv ShiBing Long Ming Liu | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，8： | 0 |
| 7 | An integrated analysis of mRNA-miRNA transcriptome data revealed hub regulatory networks in three genitourinary cancers显示文摘Bladder,kidney,prostate and testicular carcinoma are the top four genitourinary cancers in China.Here we analyzed mRNA and miRNA expression profiles of carcinomas of the bladder(TCC),kidney(ccRCC)and testis(TGCT)to uncover their specific regulatory mechanisms.The gene expression profiles of GSE31617 were downloaded from GEO database,which contained 27 samples,including 10 TCC,7 TGCT and 10 ccRCC.Specific up-and downregulated differentially expressed genes(DEGs)and differentially expressed microRNAs(DEmiRNAs)of each cancer were selected and target genes of DEmiRNAs were predicted.Gene interaction network of the shared genes and target genes of DEmiRNAs of each cancer was predicted by STRING and constructed by Cytoscape.In each cancer,we build regulatory networks of hub genes selected and conducted GO analysis of enriched genes.Furthermore,we chose four hub genes(SALL4,RHEB,CDC42 and TNN)for survival analysis in OncoLnc database,and they all had effects on the survival rate of another genitourinary cancer-kidney renal clear cell carcinoma(KIRC).In conclusion,the present study indicated that the identified hub genes promote our understanding of molecular mechanisms underlying the development of three genitourinary cancers,and might be used as molecular targets and diagnostic biomarkers for the treatment of them. | Mian LIU Xumeng ZHANG | 2017 | BIOCELL2017，41，1： | 0 |
| 8 | Perspectives on cross-domain visual analysis of cyber-physical-social big data显示文摘The domain of cyber-physical-social(CPS)big data is generally defined as the set consisting of all the elements in its defined domain,including domains of data,objects,tasks,application scenarios,and subjects.Visual analytics is an emerging human-in-the-loop big data analytics paradigm that can exploit human perception to enhance human cognitive efficiency. | Wei CHEN Tianye ZHANG Haiyang ZHU Xumeng WANG Yunhai WANG | 2021 | Frontiers of Information Technology & Electronic Engineering2021，22，12： | 0 |
| 9 | Key progresses of MOE key laboratory of macromolecular synthesis and functionalization in 2022显示文摘In 2022,The MOE Key Laboratory of Macromolecular Synthesis and Functionalization in Zhejiang University had achieved several important results.First,a series of well-defined dinuclear organoboron catalysts were developed to precisely control the enchainment of ether and carbonate segments during the copolymerization of CO_(2)and epoxides.Second,polyester had been synthesized through cationic copolymerization of cyclic anhydride.Third,ring-opening polymerization of carbon dioxide based valerolactone had been achieved,revealing the prospect of 3-ethylidene-6-vinyltetrahydro-2H-pyran-2-one(EVL)in utilizing CO_(2)and synthesizing functional polymers.Fourth,machine learning methods have been applied to biomaterial research,enabling high-throughput screening of functional biomaterial surfaces for implantable devices,and searching for potent antimicrobial peptides in whole combinatorial peptide libraries.Fifth,methods of characterization of biomacromolecule RNA transcription and manipulation of nucleoside modification were developed.Sixth,artificial enzymes-armed Bifidobacterium Longum probiotics were established to tune down gut inflammation.Seventh,three-dimensional(3D)printing technologies were used to engineer tough supramolecular hydrogels.Eighth,hydroplastic foaming graphene frameworks for acoustic and conductive polymer composites were provided for application.Ninth,aggregate photophysics about the nature of through-space interactions(TSIs)and manipulating their strength in small molecules with non-conjugated structure had been elucidated.Tenth,the forming mechanism of a newfound nested texture in poly(L-lactic acid)(PLLA)spherulitic films had been revealed.Finally,the isotropically dyeing mechanism of KDP single crystals grown from hydrogels have been explored.The related works are reviewed in this paper. | Xumeng Deng Kaihao Chen Kai Pang Xiaoting Liu Minsong Gao Jie Ren Guanwen Yang Guangpeng Wu Chengjian Zhang Xufeng Ni Peng Zhang Jian Ji Jianzhao Liu Zhengwei Mao Ziliang Wu Zhen Xu Haoke Zhang Hanying Li | 2024 | Chinese Chemical Letters2024，35，3： | 0 |
| 10 | Impact of Ta/Ti electrodes on linearities of TaOx-based resistive random-access memories for neuromorphic computing显示文摘In this work,by incorporating different electrodes(Ta/Ti)onto TaOxdielectric layer,we studied both the conductance reading and conductance updating(long term potentiation and depression)linearities in the two RRAM devices.Owing to the composition modulation(CM)mechanism,the Ta-electrode device shows better conductance reading and updating linearities.The RRAM device linearities directly influence the performance of the neural network when the devices are used as synapses.System evaluation of a two-layer neural network considering the conductance reading and updating linearity factors further confirm that both the training and inference accuracies of Ta electrode device are better than those of the Ti electrode one.We believe that this work could serve as a powerful reference for engineering synaptic devices with good linearity for neuromorphic computing applications. | YiLin Fang Tuo Shi XuMeng Zhang ZuHeng Wu JunJie An JinSong Wei Jian Lu Qi Liu | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，9： | 0 |
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