共查询到20条相似文献,搜索用时 15 毫秒
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Maksim Aleksandrovich Baranov 《电子科技学刊:英文版》2020,18(1):19-30
In this paper, the development of smart medical autonomous technology is considered. An example of a smart medical autonomous distributed system for diagnostics is also discussed. To develop this system for medical image analysis we review several processing methods. The use of the cuneiform dehydration method for medical diagnosis is considered. The experimental results obtained for blood serum dehydrated films are presented. The author proposes an algorithm for the primary identification of structures formed in the films and their use for automated detection of various structures for diagnostic purposes. The paper describes the first stage of image processing, i.e. the selection of filtering types for the correct identification of structural features and characteristics of the images. The results of filtering and some computational results of various types of structures in the films are presented. 相似文献
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设计了一种基于CCD的非接触尺寸测量系统.运用亚像素边缘检测法对圆环进行边缘检测,完成对圆环的非接触尺寸测量.利用数据库实现对测量数据的存储管理及网络传输.通过实验证明:对圆环测量精度外径误差0.005 mm,内径误差0.001 mm,壁厚误差0.015 mm,整体绝对误差小于0.02 mm,相对误差小于0.07%,满足了工程高精度测量要求.本系统适合有危害性的工业现场环境,数据的存储管理功能也给实际应用带来很大便利. 相似文献
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Information Model for Resource of ASON Control Plane 总被引:2,自引:0,他引:2
XU Yun-bin SONG Hong-sheng GUI Xuan ZHANG Jie GU Wan-yi School of Telecommunications Engineering Beijing University of Posts Telecommunications Beijing P. R. China 《中国邮电高校学报(英文版)》2004,11(3)
1 Introduction Opticalnetworkshavebecomemorecomplicatedthanbefore ,andneednetworkmanagement.InASON ,theControlPlane (CP)isanewnetworkcomponent[1~ 3] ,inordertomanagethenewemergedresources ,anin formationmodelforCPisrequired . TheReferenceModelofOpenDistributedProcessing(RM ODP) providesanobjectorientedframeworkfordistributedmanagementsystemsthatallowsuser sdif ferentrequirementsformanagementapplications[4 ] .RM ODPhasprovideduswithanetworkmanagementviewpoint,anditprovidesfiveview… 相似文献
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聂世刚 《电子产品可靠性与环境试验》2006,24(2):21-25
对加固计算机用开关电源的可靠性设计进行了系统的探讨。结合开关电源的原理.对影响其可靠性的因素和元器件的选用原则进行了阐述,着重分析了加固计算机用开关电源的可靠性设计:电应力设计、保护电路设计、热设计、电磁兼容性设计、安全性设计和三防设计。其目的在于提高加固计算机用开关电源的可靠性。 相似文献
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A method for a time-dependent solution of the heat conduction equation for semiconductor power devices will be presented. The mathematical approach to the solution is taken with the help of the eigenfunctions and eigenvalues theory, a suitable approach for these types of problems. Examples for the application of this solution for smart power devices under switching conditions will be presented. 相似文献
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Asif Khan Alam Zaib Irfan Ullah Shahid Khattak 《International Journal of Communication Systems》2020,33(6)
This paper presents link to system (L2S) interfacing technique for multiple input and multiple output (MIMO) iterative receivers. In L2S interfacing, usually the post detection signal to noise ratio (SNR)‐based frame error rate lookup tables (LUT) are used to predict the link level performance of receivers. While L2S interfacing for linear MIMO receivers can be conveniently implemented, it is more challenging for MIMO iterative receivers due to unavailability of the closed form SNR expressions. In this paper, we propose three methods for post detection SNR estimation for MIMO iterative receivers. The first is based on the QR decomposition of the channel matrix, the second relies on the residual noise calculation based on the soft symbols, and the third exploits the closed form SNR expressions for linear receivers. A link to system interface model for iterative receivers is developed for evaluating the reference curves for different modulation and coding schemes, and results are validated by comparing the simulated and predicted frame error rates. It is shown that linear and residual noise‐based SNR approximations result in a very good prediction performance whereas the performance of QR decomposition‐based method degrades for higher order modulations and coding schemes. This paper presents link to system interfacing technique for MIMO iterative receivers. A link to system interface model for iterative receivers is developed for evaluating the reference curves for different modulation and coding schemes, and results are validated by comparing the simulated and predicted frame error rates. Three post detection SNR evaluation schemes have been proposed for link to system interfacing all of which give good prediction performance especially at lower order modulation. 相似文献
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16DAPSK+OFDM及其在数字调幅广播中应用 总被引:2,自引:0,他引:2
本文提出一种新的频域16DAPSK+OFDM。并讨论它的频域差分调制和解调,然后在白高斯信道分析它的误比特性能。同时域16DASK+OFDM相比,频域16DAPSK+OFDM可用于信道特性随时间变化更快的应用。最后,在典型的调幅(AM)波段信道对两者误比特性能进行了仿真。结果表明,时域和频域16DPSK+OFDM都可用于中短波信道。在中波信道,时域16DAPSK比例域16DAPSK性能要好,在短波信道,频域16DAPSK比时域16DAPSK性能要好。另外,两者调制和解调的计算复杂度基本一样,且都不需要信息道均衡。 相似文献
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Pan Zhongliang Chen Guangju 《电子科学学刊(英文版)》2007,24(2):238-244
The circuit testable realization and its fault detection for logic functions with ESOP (EXOR-Sum-Of-Products) expressions are studied. First of all, for the testable realization by using XOR gate cascade, a test set with 2n + m + 1 vectors for the detections of AND bridging faults and a test set with 2n + m vectors for the detections of OR bridging faults are presented. Secondly, for the testable realization by using )(OR gate tree, a test set with 2n + m vectors for the detections of AND bridging faults and a test set with 3n + m + 1 vectors for the detections of OR bridging faults are presented. Finally, a single fault test set with n + 5 vectors for the XOR gate tree realization is presented. Where n is the number of input variables and m is the number of product terms in a logic function. 相似文献
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介绍了喷雾式涂胶(SprayCoating)的多种新应用。在形貌起伏很大的表面均匀地涂布光刻胶(抗蚀剂)是一项非常有挑战性的工作,喷雾式涂胶正是为了满足这个挑战而开发的。实践证明,与传统的旋涂技术相比,喷雾式涂胶可以在保持光刻胶均匀性良好的同时显著地节约光刻胶的用量。已经发现此技术可用于非圆形基片和多件基片同时涂布。此外,此技术也可以为脆弱的结构提供保护性涂胶以及悬空结构的填充。 相似文献
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用1064nm激光辐照金属样品,通过测量金属物质烧蚀阈值附近冲击波的渡越时间的突变,确定了Cu、黄Cu、Al3种样品在干燥空气中和潮湿空气巾的烧蚀阈值。干燥空气,Cu为1.0J/cm^2,黄Cu为.9J/cm^2,Al为0.68J/cm^2;潮湿空气中,Cu为1.0J/cm^2;黄Cu为0.7J/cm^2;Al为0.38J/cm^2。结果表明,潮湿空气中的黄Cu和Al样品烧蚀阈值降低了,而Cu样品的烧蚀阈值没有变化;黄Cu和Al样品烧蚀阈值降低的程度也不同,黄Cu为22%,Al为44%。 相似文献
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Yueshuang Xu Huan Wang Chengxin Luan Fanfan Fu Baoan Chen Hong Liu Yuanjin Zhao 《Advanced functional materials》2018,28(1)
The development of a highly sensitive platform for multiplex circulating microRNAs (miRNAs) detection is important for clinical diagnosis. Here, a new type of porous hydrogel encapsulated photonic crystal (PhC) barcodes is presented with integrated rolling circle amplification (RCA) strategy for multiplex miRNA quantification. As the surrounding porous hydrogel shells of the PhC barcodes are interconnected inverse opal structure with hydrophilic scaffolds, they can provide homogeneous water surrounding for the miRNA targets reaction and RCA. The encapsulated PhC cores of the barcodes can offer stable diffraction peaks for encoding different miRNAs and their RCAs during the detection. By integrating the advantages of PhC barcodes and RCA, it is demonstrated that the technology shows acceptable accuracy and detection reproducibility for the rapid quantification of low‐abundance miRNAs, with the limits of detection of 20 fM. Thus, the proposed porous hydrogel encapsulated PhC barcodes provide a new platform for the multiplex quantification of low‐abundance targets for practical applications. 相似文献
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本文首先概述数字图象与数字电视的发展前景,简单说明图象与电视数字压缩编码的必要性和可行性。接着介绍这方面的国际标准,即ISO-JPEG对静止图象、CCITT-H.261对可视会议电话、ISO-MPEG对全运动电视拟订的三种压缩编码标准。其后,介绍对全数字高清晰电视现正试验的几种制式情况。最后,概述数字电视在多媒体系统应用的发展。 相似文献
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José Vicente Calvano Antônio Carneiro de Mesquita Filho Vladimir Castro Alves Marcelo Soares Lubaszewski 《Microelectronics Journal》2002,33(10):823-834
This work presents a method for synthesizing testable continuous-time linear time-invariant electrical networks using 1st order blocks for the implementation of analog linear circuits. A functional-structural fault model for the block, and a fault dictionary are proposed together with a simple set of test vectors. The method allows, also, the fault grade evaluation for the modeled faults. The results obtained from the two application examples have shown the suitability of the approach as a design for test method for analog circuits. 相似文献
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远程空空导弹发射问题的研究 总被引:1,自引:1,他引:0
在导弹发射技术上,远程空空导弹明显不同于中、近程空空导弹。为解决远程空空导弹的发射问题,文章提出了一种远程空空导弹攻击区的确定方法,建立了估计导弹对目标预测拦截时间的算法,讨论了发射远程空空导弹的信息需求及获取方法,并基于以上研究拟订了发射远程空空导弹的火控算法。最后给定目标随机参数的变化范围,对远程空战过程进行了仿真。大量仿真结果表明,可靠发射、非完全可靠发射和非完全可靠强化发射条件下有不同的成功概率,这种发射条件的火控算法从理论上有效地解决了远程空空导弹的发射问题。 相似文献
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微波加热法制备电极材料活性炭 总被引:2,自引:0,他引:2
以煤为原料,KOH为活化剂,采用微波辐射加热法和电阻炉加热法制备出双电层电容器用活性炭。对比研究了两种工艺下KOH用量、活化时间对活性炭比电容量的影响,考察了活性炭双电层电容器的充放电特性。结果显示:微波活化时,ζ(KOH∶煤)为3∶1,起电弧时间5min,比电容为283.67F/g;电阻炉活化时,ζ(KOH∶煤)为4∶1,保温时间为1h,比电容为235.55F/g。经过100次循环充放电后,微波法和电阻炉法所得的活性炭的比电容分别保持在98.10%和91.04%。 相似文献