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Design of Digital Voice Storage and Playback System 预览
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作者 Xiaoling Ren Huiqiong Feng Kaida Shen 《当前的电子和电信》 2019年第1期22-30,共9页
The traditional tape voice recording and reproducing system has many limitations due to its large volume and inconvenient use in the use of electronic and information processing. This paper presents a compact, low-pow... The traditional tape voice recording and reproducing system has many limitations due to its large volume and inconvenient use in the use of electronic and information processing. This paper presents a compact, low-power digital voice storage and playback system will be able to replace it. The basic principle of digital voice storage and playback system is the digital control of voice recording and playback. Among them, the key technology is that in order to increase the voice storage time and improve the utilization of memory, the use of non-distortion compression algorithm to compress the voice signal and then stored in the playback and then decompression while the input voice signal Filtering to suppress noise and interference, thus ensuring the reliable quality of voice playback. The system uses three methods, namely data acquisition, straight sampling, sample sampling and self-similar incremental modulation to complete the storage and playback of voice signals 32.7s, 65.5s and 147.4s respectively. The front straight AGC controls the speech signal within the controllable range of the A / D converter to ensure that the voice signal is not distorted. Bandpass filter a reasonable range eff ectively, filters out-of-band noise and reduces aliasing distortion. Through the post-level compensation circuit on the output of the voice signal correction, playback voice clear. The system has the functions of automatic recording, manual recording, recording and playing time display and protection of voice signal after power failure. 展开更多
关键词 DIGITAL STORAGE PLAYBACK DIGITAL FILTERING sampling ANALOG / DIGITAL CONVERSION calibration
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Development of the HL-2M digital pulse analysis system
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作者 潘银海 郑博文 +1 位作者 张伟 阴泽杰 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第11期93-98,共6页
A digital pulse analysis system is an important diagnostic system in nuclear physics experimental research.In response to the demand for reflecting the particle state in a nuclear physics experiment,we have designed a... A digital pulse analysis system is an important diagnostic system in nuclear physics experimental research.In response to the demand for reflecting the particle state in a nuclear physics experiment,we have designed and developed a real-time digital pulse analysis system and applied it to the digital nuclear pulse waveform discrimination of different detectors in the HL-2M tokamak.The system is based on the peripheral component interconnect extensions for instrumentation(PXI)platform,while its software was written in LABVIEW.The key technologies involved in the system implementation include digital pulse analysis technology,digital discrimination technology,pulse height analysis technology,etc.The system has been applied to the plastic scintillator detector at the Neutron Source Lab of the University of Science and Technology of China.And the experimental results indicate that the system can discriminate between neutron(n)particles and gamma(γ)particles well when used to measure the plastic scintillator detector. 展开更多
关键词 DIGITAL PULSE analysis plastic scintillator DETECTOR DIGITAL DISCRIMINATION PULSE HEIGHT ANALYSES
数字化电动舵机测控系统设计 预览
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作者 朱璐 宋志强 刘伟 《现代防御技术》 2019年第4期115-121,共7页
舵机作为导弹飞行控制系统的执行机构,接收飞行控制系统指令驱动空气舵偏转,调整导弹的飞行姿态和轨迹,实现对导弹的飞行控制。舵机的性能直接影响导弹的总体性能,影响导弹的飞行品质和制导精度。随着伺服系统的发展和数字化控制技术的... 舵机作为导弹飞行控制系统的执行机构,接收飞行控制系统指令驱动空气舵偏转,调整导弹的飞行姿态和轨迹,实现对导弹的飞行控制。舵机的性能直接影响导弹的总体性能,影响导弹的飞行品质和制导精度。随着伺服系统的发展和数字化控制技术的应用,数字化电动舵机已在导弹研制中得到广泛应用。设计了一套基于DSP与FPGA的数字化电动舵机测控系统,从总体设计、电源设计、控制电路、驱动电路、测控软件等几方面介绍了测控系统的组成。该系统可以验证不同控制算法对电动舵机的控制效果以及实现对电动舵机的功能测试和性能分析。 展开更多
关键词 导弹 数字化 电动舵机 数字信号处理器 现场可编程门阵列 测控系统
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New Concept of Digital Structuring Landscape of the Island Systems of the Vladivostok City District 预览
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作者 Valeriy Titovich Starozhilov 《地球科学和环境保护期刊(英文)》 2019年第2期114-121,共8页
A new concept of digital vector-layer structuring of landscape space at the local level (on a scale of 1:25,000) is considered on the example of Russian island and adjacent island systems of the Vladivostok urban dist... A new concept of digital vector-layer structuring of landscape space at the local level (on a scale of 1:25,000) is considered on the example of Russian island and adjacent island systems of the Vladivostok urban district. Synthesis, analysis and evaluation of the internal and external content of landscape systems are carried out and altitude complexes of tracts are identified, in each of which altitudes are distinguished. It is noted that one of the main criteria for identifying high-altitude complexes and levels is the high-altitude criterion and the quantitative and qualitative changes in their internal content, taking into account the state of erosion-denudation lowland and mountain landscape systems formed under the influence of the Earth’s real material-energy flows and first of all gravitational energy. According to these criteria, landscape areas are classified and vertex, saddle, upper slope, middle slope and other altitude complexes of tracts are distinguished in each of which altitude levels are distinguished. Structuring and classification proposed to the reader are presented for further study of structures as objects of industry-specific indication and possibilities of using high-landscape complexes as development areas. Noted, as well as the fact that the study was conducted for the first time and is aimed at the practical implementation of the landscape approach in the development of landscape systems, defines the relevance of the work performed. 展开更多
关键词 Concept DIGITAL STRUCTURING LANDSCAPE TRACT Complex Level RELIEF Development
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Yuan to Go Digital
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作者 Li Qing 《北京周报:英文版》 2019年第38期34-35,共2页
After the remarkable success in digitalizing payments nationwide, China is ready to unveil its next financial innovation by launching its own digital currency(CBDC).
关键词 DIGITAL INNOVATION DIGITAL CURRENCY
Building global ecosystem: Globalization of China’s information industry in view of the “Belt and Road”
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作者 XU Zhi-qiang HAO Wen-jing WANG Xue-mei 《生态经济:英文版》 2019年第2期148-155,共8页
In the paper, after clarification of concepts about digital economy and the 'Belt and Road',the author analyzes the status quo of information infrastructure of countries along the route. And then, the author r... In the paper, after clarification of concepts about digital economy and the 'Belt and Road',the author analyzes the status quo of information infrastructure of countries along the route. And then, the author raises the idea that it needs to make joint efforts in the developing path of information, industry and intelligence ecosystems, so as to realize the global construction of the digital 'Belt and Road'. And in the essay, they are called 1.0, 2.0 and 3.0 versions of China’s going-out strategy respectively. Under such circumstances, the digital reform approaches of bridging digital gap of different countries are put forward,from the four different aspects of platform media, emerging technology, digital literacy and think tanks. 展开更多
关键词 the BELT and ROAD DIGITAL economy digital LITERACY community of shared future GLOBAL ECOSYSTEM
Analysis of 24 patients with Achenbach's syndrome 预览
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作者 Fatih Ada Ferit Kasimzade 《世界临床病例杂志》 2019年第10期1103-1110,共8页
BACKGROUND Achenbach’s syndrome is a rare condition,and the etiology is unknown.It is most commonly seen in the volar plate of the hand distal interphalangeal joint.Patients diagnosed with Achenbach’s syndrome in ca... BACKGROUND Achenbach’s syndrome is a rare condition,and the etiology is unknown.It is most commonly seen in the volar plate of the hand distal interphalangeal joint.Patients diagnosed with Achenbach’s syndrome in cardiovascular surgery clinic were retrospectively compared with the literature.AIM To investigate the symptoms,findings,sociodemographic conditions,and laboratory data of patients diagnosed with Achenbach’s syndrome.METHODS The study is a retrospective review of 24 patients diagnosed with Achenbach’s syndrome at Afyonkarahisar State Hospital between March 2015 and November 2016,at Sivas Numune Hospital between November 2016 and November 2017,and at Cumhuriyet University Cardiovascular Surgery Department between November 2017 and November 2018.In the study,demographic characteristics of the patients,signs and symptoms of the disease,and laboratory data were analyzed retrospectively.RESULTS The cohort consisted of 83.33%female patients and 16.67%male patients.The disease was most commonly located in the index finger of the right hand.All of the patients complained of bruising and pain.No pathologic findings were present in the laboratory results.According to these results,it can be concluded that Achenbach syndrome is most commonly seen in the right index finger of middle-aged female patients.CONCLUSION Further research is needed to clarify Achenbach’s syndrome and to develop a diagnosis and treatment algorithm.As the awareness of this syndrome increases,large amounts of data will be obtained.According to current knowledge,Achenbach’s syndrome is not among the known causes of mortality or morbidity.However,it is unknown whether it is seen in brain or other vital organs. 展开更多
关键词 Achenbach’s syndrome BLUE THUMB DIGITAL HEMATOMA DIGITAL HEMORRHAGE Hand Pulse oximeter
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数字化转型的五大陷阱 预览
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作者 李东红 《中国经济报告》 2019年第2期54-57,共4页
数字化转型是当下的热潮。企业不能落伍于时代,但也不能为了赶时髦而盲目陷入各种陷阱而不自知。现在,数字化转型的不少陷阱已然显现。想要拥抱数字化转型的企业,既要积极投身洪流,也应冷静思考,努力避免掉入战略陷阱、组织陷阱、工具... 数字化转型是当下的热潮。企业不能落伍于时代,但也不能为了赶时髦而盲目陷入各种陷阱而不自知。现在,数字化转型的不少陷阱已然显现。想要拥抱数字化转型的企业,既要积极投身洪流,也应冷静思考,努力避免掉入战略陷阱、组织陷阱、工具陷阱、治理陷阱、业绩陷阱等各种各样的陷阱之中。 展开更多
关键词 数字化 信息化 数字化转型 企业管理
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Online Shopping: What Factors Determine Consumers to Buy? 预览
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作者 Tety Elida Wahyu Rahardjo +1 位作者 Ari Raharjo Edi Sukirman 《管理研究:英文版》 2019年第3期238-246,共9页
This study analyzed factors influencing consumers in the process of making a decision in online shopping. The findings could inspire suggestions for online marketers in developing either media or infrastructures accor... This study analyzed factors influencing consumers in the process of making a decision in online shopping. The findings could inspire suggestions for online marketers in developing either media or infrastructures accordingly. The variables in the study involved product information, price, service, transaction safety, environment, age, gender, educational background, and income rate as independent variables, while the process of purchasing decision served as a dependent variable. Primary data were gathered in 10 locations within Jabodetabek areas involving 270 respondents which were analyzed using multiple regression analysis. The study revealed that price, information product, and service as significant variables influencing consumers in online shopping. Service became the most important factor for marketers to be considered as it emerged as the most dominant variable influencing the process of making a decision in online shopping. 展开更多
关键词 CONSUMER behavior digital MARKETING online SHOPPING web EXPERIENCE
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General Structure Physics of an Aerial Remote Sensing Platform and Its Systemic Accuracy Criterion 预览
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作者 Lei YAN Zhengkang ZUO +4 位作者 Yingcheng LI Xiuxiao YUAN Yan SONG Qingsheng XUE Shihu ZHAO 《测绘学报(英文版)》 2019年第2期2-16,共15页
Accuracy is a key factor in high-resolution remote sensing and photogrammetry. The factors that affect accuracy are imaging system errors and data processing errors. Due to the complexity of aerial camera errors, this... Accuracy is a key factor in high-resolution remote sensing and photogrammetry. The factors that affect accuracy are imaging system errors and data processing errors. Due to the complexity of aerial camera errors, this paper focuses on the design of digital aerial camera systems and the means to reduce system error and data processing inefficiencies. There are many kinds of digital aerial camera systems at present;however, these systems lack a unified physical model, which ultimately leads to more complicated designs and multi-camera modes. Such a system is complex and costly, as it is easily affected by factors such as vibration and temperature. Thus, the installed accuracy can only reach the millimeter level. Here, we describe a unified physical structure for a digital aerial camera that imitates an out-of-field multi-charge-coupled device (CCD), an in-field multi-CCD, and once-imaging and twice-imaging digital camera systems. This model is referred to as the variable baseline-height ratio spatiotemporal model. The variable ratio allows the opto-mechanical spatial parameters to be linked with height accuracy, thus providing a connection to the surface elevation. The twice-imaging digital camera prototype system and the wideband limb imaging spectrometer provide a transformation prototype from the current multi-rigid once-imaging aerial camera to a single rigid structure. Thus, our research lays a theoretical foundation and prototype references for the construction and industrialization of digital aerial systems. 展开更多
关键词 catadioptric optical MIRROR digital AERIAL camera normal physical MODEL of variable baseline-height ratio spatial temporal MODEL single rigid structure SYSTEMIC ACCURACY
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Remote sensing and geographic information systems techniques in studies on treeline ecotone dynamics 预览
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作者 Parveen K.Chhetri Eric Thai 《林业研究:英文版》 CAS CSCD 2019年第5期1543-1553,共11页
We performed a meta-analysis on over 100 studies applying remote sensing(RS)and geographic information systems(GIS)to understand treeline dynamics.A literature search was performed in multiple online databases,includi... We performed a meta-analysis on over 100 studies applying remote sensing(RS)and geographic information systems(GIS)to understand treeline dynamics.A literature search was performed in multiple online databases,including Web of Knowledge(Thomson Reuters),Scopus(Elsevier),BASE(Bielefeld Academic Search Engine),CAB Direct,and Google Scholar using treeline-related queries.We found that RS and GIS use has steadily increased in treeline studies since 2000.Spatialresolution RS and satellite imaging techniques varied from low-resolution MODIS,moderate-resolution Landsat,to high-resolution WorldView and aerial orthophotos.Most papers published in the 1990s used low to moderate resolution sensors such as Landsat Multispectral Scanner and Thematic Mapper,or SPOT PAN(Panchromatic)and MX(Multispectral)RS images.Subsequently,we observed a rise in high-resolution satellite sensors such as ALOS,GeoEye,IKONOS,and WorldView for mapping current and potential treelines.Furthermore,we noticed a shift in emphasis of treeline studies over time:earlier reports focused on mapping treeline positions,whereas RS and GIS are now used to determine the factors that control treeline variation. 展开更多
关键词 Digital ELEVATION model GEOGRAPHIC information systems REMOTE sensing TREELINE
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A Status Graph Based Control Allocation Algorithm of Digital Micro-Thruster Array for Micro/Nano-Satellites Orbit Control Application 预览
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作者 ZHANG Dandan ZHANG Yunyi +2 位作者 DONG Ke LI Haiwang WANG Shaoping 《南京航空航天大学学报:英文版》 EI CSCD 2019年第5期779-788,共10页
Digital micro-thruster arrays can be used for special missions of micro/nano-satellites with the requirements of high precision and small impulse.This paper presents a novel control allocation algorithm for the digita... Digital micro-thruster arrays can be used for special missions of micro/nano-satellites with the requirements of high precision and small impulse.This paper presents a novel control allocation algorithm for the digital micro-thruster array,namely status graph based control allocation(SGBCA)algorithm,which aims at finding the optimal micro thrusters combination scheme to realize the sequential control synthesis for micro/nano-satellite during real-time orbit control tasks.A mathematical model is set up for the control allocation of this multivariate over-actuated system.Through dividing thrusters into disjoint segments by offline calculation and combining segments dynamically online to provide a sequence of the required impulse for the micro/nano-satellite,the time complexity of the control allocation algorithm decreases significantly.All levels of impulse can be generated by the digital micro thruster arrays and the service life of the arrays can be extended using the segment converting strategy proposed in this paper.The simulation indicates that the algorithm can satisfy the requirements of real-time orbit control for micro/nano-satellites. 展开更多
关键词 control allocation digital micro-thruster array micro/nano-satellite orbit control
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用于穿透和聚焦在散射介质内部的光学相位共轭技术 预览
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作者 李承明月 《红外与激光工程》 EI CSCD 北大核心 2019年第7期1-9,共9页
Optical phase conjugation(OPC)is a technique that generates a light field with reversed wavefront and identical amplitude distribution as the incident light.It has a unique feature of suppressing the aberration of inc... Optical phase conjugation(OPC)is a technique that generates a light field with reversed wavefront and identical amplitude distribution as the incident light.It has a unique feature of suppressing the aberration of incident beam induced by inhomogeneous or disturbing medium.Although this technique has been extensively studied since the 1970s,it has become more attractive because of unprecedented achievements and prospective potentials in biomedical applications.OPC-based techniques have been successfully utilized to form a focus through/inside highly scattered biological samples.It opens a new avenue by significantly enhancing the light delivery in biological tissue for high-resolution imaging,diagnosis and treatment of medical diseases.In order to provide insight into its further development,recent progress of OPC techniques for focusing light through/inside biological tissue was summarized. 展开更多
关键词 optical PHASE CONJUGATION HOLOGRAPHY digital HOLOGRAPHY HOLOGRAPHIC material PHASE CONJUGATE mirror
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Assessing the performance of decision tree and neural network models in mapping soil properties
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作者 Fatemeh HATEFFARD Payam DOLATI +1 位作者 Ahmad HEIDARI Ali Asghar ZOLFAGHARI 《山地科学学报:英文版》 SCIE CSCD 2019年第8期1833-1847,共15页
To build any spatial soil database, a set of environmental data including digital elevation model(DEM) and satellite images beside geomorphic landscape description are essentials. Such a database, integrates field obs... To build any spatial soil database, a set of environmental data including digital elevation model(DEM) and satellite images beside geomorphic landscape description are essentials. Such a database, integrates field observations and laboratory analyses data with the results obtained from qualitative and quantitative models. So far, various techniques have been developed for soil data processing. The performance of Artificial Neural Network(ANN) and Decision Tree(DT) models was compared to map out some soil attributes in Alborz Province, Iran. Terrain attributes derived from a DEM along with Landsat 8 ETM+, geomorphology map, and the routine laboratory analyses of the studied area were used as input data. The relationships between soil properties(including sand, silt, clay, electrical conductivity, organic carbon, and carbonates) and the environmental variables were assessed using the Pearson Correlation Coefficient and Principle Components Analysis. Slope, elevation, geomforms, carbonate index, stream network, wetness index, and the band’s number 2, 3, 4, and 5 were the most significantly correlated variables. ANN and DT did not show the same accuracy in predicting all parameters. The DT model showed higher performances in estimating sand(R~2=0.73), silt(R~2=0.70), clay(R~2=0.72), organic carbon(R~2=0.71), and carbonates(R~2=0.70). While the ANN model only showed higher performance in predicting soil electrical conductivity(R~2=0.95). The results showed that determination the best model to use, is dependent upon the relation between the considered soil properties with the environmental variables. However, the DT model showed more reasonable results than the ANN model in this study. The results showed that before using a certain model to predict variability of all soil parameters, it would be better to evaluate the efficiency of all possible models for choosing the best fitted model for each property. In other words, most of the developed models are sitespecific and may not be applicable to use for predicting othe 展开更多
关键词 Digital SOIL MAPPING SOIL properties environmental VARIABLES Artificial Neural Network DECISION Tree
数字化、智能化电气实验室的服务框架 预览
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作者 王博 刘蕾 王乐 《电工技术》 2019年第14期150-152,155共4页
将实验室内试品管理、试验过程、试验数据、设备状态数字化、网络化、可视化,能提高试验效率和设备安全管理水平。利用大数据技术对实验室的数据进行搜集、挖掘、处理以及应用,可实现客户需求预测、设备状态评估和寿命预测、产品开发建... 将实验室内试品管理、试验过程、试验数据、设备状态数字化、网络化、可视化,能提高试验效率和设备安全管理水平。利用大数据技术对实验室的数据进行搜集、挖掘、处理以及应用,可实现客户需求预测、设备状态评估和寿命预测、产品开发建议以及试验技术咨询等增值服务。文章介绍了XIHARI建设的数字化、智能化电气实验室的服务框架,重点阐述了试验委托系统、物流系统、智慧能源及设备监控系统、数据采集系统以及大数据平台的设计思想、基本架构和各系统之间的内在联系。 展开更多
关键词 数字化 智能化 数据采集系统 智慧能源系统 大数据平台
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公共图书馆非物质文化遗产数据库建设研究 预览
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作者 孔凡敏 《大学图书情报学刊》 2019年第3期83-86,共4页
分析公共图书馆非物质文化遗产数据库建设和使用过程中面临的问题和挑战,从技术方法和用户使用习惯入手,提出完善图书馆非物质文化遗产数据库的方法,即:推进数据库元数据标准化建设;大力加强非物质文化遗产数据库中数字化技术的应用;构... 分析公共图书馆非物质文化遗产数据库建设和使用过程中面临的问题和挑战,从技术方法和用户使用习惯入手,提出完善图书馆非物质文化遗产数据库的方法,即:推进数据库元数据标准化建设;大力加强非物质文化遗产数据库中数字化技术的应用;构建非物质文化遗产数据库共享系统和平台;加大对非物质文化遗产复合型人才的培养。 展开更多
关键词 公共图书馆 非物质文化遗产 数据库 数字化
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二维码的动态艺术化处理 预览
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作者 夏彬皓 狄静雅 +1 位作者 张盼盼(指导) 赵满旭(指导) 《信息技术与信息化》 2019年第10期11-13,共3页
二维码是移动互联网时代的宠儿。在这个经济与社会发展迅速的时代,它在生活中已随处可见。二维码的经济价值主要体现在其图案中承载、传递的信息。利用Adobe Photoshop等软件,对二维码自身的图形进行动态艺术化处理,能让其实现更大的价值。
关键词 动态艺术二维码 数字 平面设计
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Manipulation of superconducting qubit with direct digital synthesis
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作者 李志远 于海峰 +2 位作者 谭新生 赵士平 于扬 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第9期78-82,共5页
We investigate the XY control and manipulation of the superconducting qubit state using direct digital synthesis(DDS)for the microwave pulse signal generation.The decoherence time, gate fidelity, and other qubit prope... We investigate the XY control and manipulation of the superconducting qubit state using direct digital synthesis(DDS)for the microwave pulse signal generation.The decoherence time, gate fidelity, and other qubit properties are measured and carefully characterized, and compared with the results obtained by using the traditional mixing technique for the microwave pulse generation.In particular, the qubit performance in the state manipulation with respect to the sampling rate of DDS is studied.Our results demonstrate that the present technique provides a simple and effective method for the XY control and manipulation of the superconducting qubit state.Realistic applications of the technique for the possible future scalable superconducting quantum computation are discussed. 展开更多
关键词 SUPERCONDUCTING QUBIT direct digital synthesis ARBITRARY WAVEFORM GENERATOR
基于裂隙灯转鼓的数字化装校技术研究 预览
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作者 陈华 沈建新 姚凤莹 《应用光学》 CAS CSCD 北大核心 2019年第1期127-131,共5页
针对裂隙灯转鼓的光学装校,提出一种数字化装校方法。该方法采用透射式装校系统原理,在检测光路前后加入十字线,通过观察2个十字线在CCD图像中的成像来判断装校质量,最后通过图像处理得到数字化信息。通过提取2个十字线的中点坐标,判断... 针对裂隙灯转鼓的光学装校,提出一种数字化装校方法。该方法采用透射式装校系统原理,在检测光路前后加入十字线,通过观察2个十字线在CCD图像中的成像来判断装校质量,最后通过图像处理得到数字化信息。通过提取2个十字线的中点坐标,判断转鼓光学系统的光轴是否一致;通过提取CCD图像的清晰度大小,判断转鼓光学系统是否对焦。利用该方法对转鼓进行装校,结果表明:该方法是一种利用图像处理技术将装校位置信息转化为数字信息的数字化方法,通过数字图像分析装校误差在0.1 mm以内。 展开更多
关键词 光学装校 数字化 裂隙灯 转鼓
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一种多笔画图形加数字的图形密码方案 预览
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作者 顾彦波 李敬文 +1 位作者 火金萍 席晓慧 《计算机工程与科学》 CSCD 北大核心 2019年第11期1954-1960,共7页
安卓解锁模式(简称AUP)是目前在手机、pad等手持设备上应用最广泛的图形密码解锁方案。但是,在实际中能够使用到的密码只是图形密码空间中的一小部分,并且由于用户的使用习惯使得密码的分布不均匀,导致AUP的实际安全性远低于其理论上的... 安卓解锁模式(简称AUP)是目前在手机、pad等手持设备上应用最广泛的图形密码解锁方案。但是,在实际中能够使用到的密码只是图形密码空间中的一小部分,并且由于用户的使用习惯使得密码的分布不均匀,导致AUP的实际安全性远低于其理论上的安全性,更容易被攻击者破解。提出一种多笔画图形加数字的图形密码方案MSDGP,系统会根据用户的选择推荐相应难度级别的密码。该方案类似于AUP,根据数字及其位置的不同,很大程度上增加了图形密码空间,图形密码由系统推荐生成,避免了因用户的使用习惯而造成的分布不均问题,从而有效防止了暴力破解和字典攻击,因而具有更高的安全性。 展开更多
关键词 多笔画图形 图形密码 数字 安全性分析 安卓
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