共查询到15条相似文献，搜索用时 281 毫秒
1.
详细介绍了循环冗余校验CRC(CyclicRedundancyCheck)的差错控制原理及其算法实现.以CRC-4为例,给出了CRC校验码的具体计算过程和使用VHDL[2][3][4]来实现CRC编码电路,并以Altera公司EDA工具Quartus Ⅱ作为编译、仿真平台,选用Cyclone系列中的器件,完成了CRC-4编码器的电路设计. 相似文献
2.
刘星华 《福建工程学院学报》2007,5(1):76-78
从CRC-16的硬件实现电路出发,分析了CRC-16编码和校验快速实现的原理,推导出简洁的公式,适合在单片机系统及PC机系统中实现,并给出CRC-16在8051单片机中软件实现的源代码. 相似文献
3.
介绍了循环冗余校验原理,并以CRC-16生成多项式为例,用Verilog HDL硬件描述语言描述该算法.采用Quartus Ⅱ 8.0进行综合、仿真,并用Cyclone Ⅱ系列的EP2C35F672C6器件适配和编程下载,在DE2开发板上实现.该CRC模块既是CRC校验生成模块,又是CRC校验检错模块.另外,该CRC模块还可以封装成具有Avalon总线接口的自定义组件IP核,从而可以重复利用.实验结果表明,该校验器速度快,占用资源少,并在实际中得到了应用. 相似文献
4.
模糊金库方案是生物特征加密领域一种流行的密钥绑定方案，它将生物特征与秘密数据安全地绑定在一起，形成一个金库且能够实现“模糊”解锁，攻击者不能从金库中获取生物特征或秘密数据。因此，方案可以在保护秘密数据的同时，也保护用户的生物特征。基于CRC循环冗余编码的模糊金库是模糊金库应用于生物特征认证识别的一种重要实现，但是其存在两类严重问题，即CRC碰撞和无法抵抗混合替代攻击。提出了基于CRC与离散对数难题的双重认证模糊金库，可以同时解决这两类问题。 相似文献
5.
16位CRC校验原理与基于PLC的算法程序设计 总被引：3，自引：0，他引：3
胡惠玉 《常熟理工学院学报》2009,23(10):80-83,88
数据在通信线路上传输时,由于各种各样的干扰和噪声的影响,导致接收端可能收到不正确的数据．实际工程中,常用16位CRC校验方式实现工业网络底层PLC与上位PC机通讯系统中数据链路层差错校验．文中分析了CRC校验原理,提出了实现CKC校验的算法,编写了基于西门子S7—200PLC的CRC校验程序． 相似文献
6.
王娜 《通化师范学院学报》2006,27(2):41-43
CAN总线(Controller Area Network)即控制器局域网,它的最大优点是采用了通信数据模块编码,而不是传统的站地址编码,所以自从诞生以来,以其良好的性能愈来愈受到工业界的青睐.CAN总线有即插即用和多站接收数据等特点,通过了CRC检测并提供了相应的硬件处理能力,从而保证了数据传 相似文献
7.
CRC算法及其单片机实现 总被引：1，自引：0，他引：1
杨庆 《广东教育学院学报》2007,27(5):83-86
在数据通信中,由于诸多因素的影响,设备之间的通信数据常常会发生一些无法预测的错误.为确保高效而无差错地传输数据,降低错误所带来的影响,必须对数据进行检错,即差错控制.一般在通信时采用数据校验的办法,在诸多检错手段中,CRC是最著名的一种.利用51系列单片机可以实现CRC. 相似文献
8.
在数据通信中,循环冗余校验因其编码简单有效,常被用来降低数据传输的误码率.文中介绍了VSR系统和循环冗余校验原理,阐述了用于VSR系统的两种不同的CRC码生成方案.仿真试验证明了采用并行处理CRC检错码,能更有效地提高传输速度. 相似文献
9.
林寿光 《宁波职业技术学院学报》2010,14(5):66-68
利用哈夫曼压缩编码的原理及方法,采用MATLAB软件对两幅图片进行压缩编码程序设计,获得压缩信息及哈夫曼编码表,分析压缩后的图像像素数据及压缩比。结果表明,哈夫曼编码是一种无损压缩编码。 相似文献
10.
云存储系统由于其系统复杂性和业务特征,使数据可靠性受到严重挑战。针对云计算环境下带数据去重的云存储系统的内部数据保护问题,提出一种基于纠删码的数据可靠性保障机制,采用多种纠删编码算法及配置方法对去重数据块进行编码保护。该机制具有良好的综合性能与可扩展性。 相似文献
11.
CRC是目前网络中普遍采用的一种检测码 ,只有真正了解和掌握它 ,才能选择合适的CRC ,使传输帧达到冗余位少、漏检率低的目的 ,从而提高传输效率。本文从CRC的理论基础、冗余位的产生方法、性能分析及实现手段等方面作了全面的剖析 相似文献
12.
Yan ZHANG Wenjia ZHANG Min XIA Zhujun XIE Fangmei AN Qiang ZHAN Wenying TIAN Tianyue ZHU 《Journal of Zhejiang University. Science. B》2021,22(2):136
Objective:To investigate the relationship between the fatty acid-binding protein 4(FABP4)and colorectal cancer(CRC).Methods:Using an enzyme-linked immunosorbent assay(ELISA),we measured the expression of FABP4 in plasma of50 patients who underwent surgery for CRC from October 2017 to May 2018 and 50 healthy controls.The content of the visceral fat area(VFA)as seen with abdominal computed tomography(CT)scanning was measured by ImageJ software.The expression levels of FABP4,E-cadherin,and Snail proteins in CRC and adjacent tissues were determined by immunohistochemistry.Results:The mean concentration of plasma FABP4 of CRC patients was higher than that of the control group(22.46 vs.9.82 ng/m L;P<0.05).The concentration of plasma FABP4 was related to the tumor,node,metastatis(TNM)stage and lymph node metastasis and was independent of age,body mass index(BMI),tumor size and location,and the degree of differentiation of CRC.The concentration of plasma FABP4 was positively correlated with high VFA and lipoprotein-a(LPA)(P<0.05);but it was not correlated with total cholesterol(TG),total triglyceride(TC),low-density lipoprotein(LDL),high-density lipoprotein(HDL),or apolipoprotein AI(Apo-AI).The expression of FABP4 protein in CRC tissues was positively correlated with the degree of CRC differentiation,tumor stage,and lymph node metastasis.The level of FABP4 protein was negatively correlated with E-cadherin protein(r=-0.3292,P=0.0196)and positively correlated with Snail protein(r=0.5856,P<0.0001).Conclusions:High LPA and VFA were risk factors for increased plasma FABP4 in CRC patients.FABP4 protein was highly expressed in CRC tissues and associated with TNM stage,differentiation,and lymph node metastasis of CRC.The level of FABP4 in CRC tissue was correlated with E-cadherin and Snail expression,suggesting that FABP4 may promote CRC progression related to epithelial-mesenchymal transition(EMT). 相似文献
13.
Laura Lundy 《牛津教育评论》2013,39(4):393-411
This article aims to shed light on the impact of the United Nations Convention on the Rights of the Child (CRC) on education policy in Europe. The findings are based on a documentary analysis of the published reports of the Committee on the Rights of the Child (the Committee) on the implementation of the education rights in the CRC in every EU state. This included: a review of the state of children's rights to education in Europe as perceived by the Committee; a summary of the Committee's key recommendations for governments; and an assessment of whether the CRC can be considered to have influenced domestic education law and policies. The findings suggest that the CRC is having an impact on domestic education policy and that the child rights framework could be harnessed further by those seeking to influence government. The article concludes by reflecting on the factors which affect the processes of translating the CRC into policy and practice and explores the role that educationalists, both academic and practitioners, might play in its implementation. 相似文献
14.
Preoperatively molecular staging with CM10 ProteinChip and SELDI-TOF-MS for colorectal cancer patients 总被引：8，自引：0，他引：8
Xu WH Chen YD Hu Y Yu JK Wu XG Jiang TJ Zheng S Zhang SZ 《Journal of Zhejiang University. Science. B》2006,7(3):235-240
Objectives： To detect the serum proteomic patterns by using SELDI-TOF-MS （surface enhanced laser desorption/ ionization-time of flight-mass spectrometry） technology and CM10 ProteinChip in colorectal cancer （CRC） patients, and to evaluate the significance of the proteomic patterns in the tumour staging of colorectal cancer. Methods： SELDI-TOF-MS and CM10 ProteinChip were used to detect the serum proteomic patterns of 76 patients with colorectal cancer, among them, 10 Stage Ⅰ, 19 Stage Ⅱ, 16 Stage Ⅲ and 31 Stage Ⅳ samples. Different stage models were developed and validated by support vector machines, disctiminant analysis and time-sequence analysis. Results： The Model Ⅰ formed by 6 protein peaks （m/z： 2759.58, 2964.66, 2048.01, 4795.90, 4139.77 and 37761.60） could be used to distinguish local CRC patients （Stage Ⅰ and Stage Ⅱ） from regional CRC patients （Stage Ⅲ） with an accuracy of 86.67% （39/45）. The Model Ⅱ formed by 3 protein peaks （m/z： 6885.30, 2058.32 and 8567,75） could be used to distinguish locoregional CRC patients （Stage Ⅰ, Stage Ⅱ and Stage Ⅲ） from systematic CRC patients （Stage IV） With an accuracy of 75.00% （57/76）. The Model Ⅲ could distinguish Stage Ⅰ from Stage Ⅱ with an accuracy of 86.21% （25/29）. The Model Ⅳ could distinguish Stage Ⅰ from Stage Ⅲ with accuracy of 84.62% （22/26）. The Model Ⅴ could distinguish Stage Ⅱ from Stage Ⅲ with accuracy of 85.71% （30/35）. The Model Ⅵ could distinguish Stage Ⅱ from Stage Ⅳ with accuracy of 80.00% （40/50）. The Model Ⅶ could distinguish Stage Ⅲ from Stage Ⅳ with accuracy of 78.72% （37/47）. Different stage groups could be distinguished by the two-dimensional scattered spots figure obviously. Conclusion： This method showed great success in preoperatively determining the colorectal cancer stage of patients. 相似文献
15.
Chao LI Da-ren LIU Long-yun YE Ling-na HUANG Sanjay JAISWAL Xiao-wen LI Hou-hong WANG Li CHEN 《Journal of Zhejiang University. Science. B》2014,15(6):582-589