期刊文献+
共找到10篇文章
< 1 >
每页显示 20 50 100
长城0520CH图象的磁盘存取方法及其应用
1
作者 刘烈斌 《电子技术应用》 北大核心 1991年第8期9-11,共3页
一、前言目前,长城0520CH 提供的虚拟图形设备(GRP)是一种功能很强的绘图工具。它提供了两组图象磁盘存取命令,即GET,PUT 与BLOAD,BSAVE,但是这两组命令在进行磁盘存取时,都要在磁盘上建立三个不同的文件,这无疑给磁盘文件管理带来了不便,
关键词 图象设备 磁盘存取法 绘图工具
下载PDF
对象关系数据库中连接谓词索引技术的研究 被引量:1
2
作者 阳国贵 吴泉源 《国防科技大学学报》 EI CAS CSCD 2000年第1期1-6,共6页
讨论了一种适合于对象关系数据库的新型索引结构———连接谓词索引 ,在介绍了谓词索引之后 ,给出了基于该索引结构的连接算法 ,并分析了连接算法的性能 ,提出了根据性能计算来确定关系R和S中谁作为外关系 ,从而降低算法代价的方法 ,特... 讨论了一种适合于对象关系数据库的新型索引结构———连接谓词索引 ,在介绍了谓词索引之后 ,给出了基于该索引结构的连接算法 ,并分析了连接算法的性能 ,提出了根据性能计算来确定关系R和S中谁作为外关系 ,从而降低算法代价的方法 ,特别地 ,本文还把连接谓词索引推广到一般形式 。 展开更多
关键词 索引结构 对象关系数据库 连接谓词索引 存取法
下载PDF
数据跟踪系统在钢管水压试验机中的应用
3
作者 宋小平 《重型机械》 2018年第6期17-21,共5页
多数钢管水压试验机都需要人工记录钢管长度测量结果,该方法容易产生问题数据,且生产效率低。为此,提出了钢管长度数据自动跟踪的方法。钢管长度数据跟踪系统中,采用DB块存取法或者数据库存取法对长度数据进行存储、取出、删除和更新。D... 多数钢管水压试验机都需要人工记录钢管长度测量结果,该方法容易产生问题数据,且生产效率低。为此,提出了钢管长度数据自动跟踪的方法。钢管长度数据跟踪系统中,采用DB块存取法或者数据库存取法对长度数据进行存储、取出、删除和更新。DB块存取法适用于信息量较小、存储量较小的数据跟踪系统;数据库存取法适用于规模较大或者功能要求较高的数据跟踪系统。实际应用表明,该方法可以保证钢管长度数据的准确性、可靠性,同时提高了生产效率。 展开更多
关键词 钢管水压试验设备 数据跟踪系统 DB块存取法 数据库存取法
下载PDF
海峡两岸同源异形电脑术语辨析(之十九)
4
作者 盛玉麒 《术语标准化与信息技术》 1999年第3期16-19,共4页
关键词 术语辨析 同源异形 海峡两岸 规范译名 多词术语 结构助词 同位标磁道组 基本索引顺序存取法 原形 基本远程通信存取法
下载PDF
生产中的高技术
5
作者 陈天铎 《管理观察》 1996年第7期27-27,共1页
关键词 高技术 生产中 图形存取法 计算机辅助设备 科研试验 生产过程 设计工作 内容和原则 产品生产周期 机械制造
下载PDF
Joint Non-Orthogonal Multiple Access (NOMA) & Walsh-Hadamard Transform: Enhancing the Receiver Performance 被引量:2
6
作者 Muhammad Rehan Usman Arsla Khan +1 位作者 Muhammad Arslan Usman Soo young Shin 《China Communications》 SCIE CSCD 2018年第9期160-177,共18页
Non-orthogonal multiple access(NOMA) is a new access method to achieve high performance gains in terms of capacity and throughput, so it is currently under consideration as one of the candidates for fifth generation(5... Non-orthogonal multiple access(NOMA) is a new access method to achieve high performance gains in terms of capacity and throughput, so it is currently under consideration as one of the candidates for fifth generation(5 G) technologies. NOMA utilizes power domain in order to superimpose signals of multiple users in a single transmitted signal. This creates a lot of interference at the receive side. Although the use of successive interference cancellation(SIC) technique reduces the interference, but to further improve the receiver performance, in this paper, we have proposed a joint Walsh-Hadamard transform(WHT) and NOMA approach for achieving better performance gains than the conventional NOMA. WHT is a well-known code used in communication systems and is used as an orthogonal variable spreading factor(OVSF) in communication systems. Application of WHT to NOMA results in low bit error rate(BER) and high throughput performance for both low and high channel gain users. Further, it also reduces peak to average power ratio(PAPR) of the user signal. The results are discussed in terms of comparison between the conventionalNOMA and the proposed technique, which shows that it offers high performance gains in terms of low BER at different SNR levels, reduced PAPR, high user throughput performance and better spectral efficiency. 展开更多
关键词 Bit error rate (BER) non-orthogonal multiple access (NOMA) orthogonal frequency division multiplexing (OFDM) peak to average power ratio (PAPR) successive interference cancellation (SIC) throughput and Walsh-Hadamard transform (WHT).
下载PDF
Study on the Degradation Trend of Ryegrass-White Clover Artificial Grassland 被引量:12
7
作者 张建波 李相林 +4 位作者 万里强 陈瑞祥 赵相勇 陈伟 陈国南 《Agricultural Science & Technology》 CAS 2009年第1期26-28,88,共4页
[Objective] The study aimed to explore the degradation law and trend of artificial grassland. [Method] Taking the ryegrass (Lolium perenne) - white clover ( Trifolium repens) artificial grassland in Maiping Townsh... [Objective] The study aimed to explore the degradation law and trend of artificial grassland. [Method] Taking the ryegrass (Lolium perenne) - white clover ( Trifolium repens) artificial grassland in Maiping Township, Guizhou Province as the research object, the grassland vegetation of 40 quadrate from different areas (area around the sheep shed, hilltop, hillside, flatland at the foot of the hill) were analyzed by comparing the dominance and richness index. [ Result] Degradation of different degrees appeared in various areas of this artificial grassland. To be specific, the degradation of grassland around the sheep shed was not serious for less consumption by the sheep; however, the areas on the hilltop and hillside degenerated to the grassland types of dallis grass ( Paspalum dilatatum Poir. ) -Indian lovegrass ( Eragrostis pilosa) and dallis grass - cogongrass [ Imperata cylindrica ( Linn. ) Beauv. ], respectively, and the area at the foot of the hill degenerated to the grassland type dominated by garland chrysanthetnum ( Chrysanthemum coronarium L. ) and knotgrass ( Paspalum distichum L. ). [ Conclusion ] This study provided a basis for grassland improvement as well as the efficient and sustainable utilization of grazing-type artificial grassland in South China. 展开更多
关键词 Ryegrass Lolium perenne) White clover( Trifolium repens) Artificial grassland DEGRADATION
下载PDF
A NOVEL MULTI-VALUED BAM MODEL WITH IMPROVED ERROR-CORRECTING CAPABILITY
8
作者 Zhang Daoqiang Chen Songcan (College of Info. Sci. Tech., Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016) 《Journal of Electronics(China)》 2003年第3期220-223,共4页
A Hyperbolic Tangent multi-valued Bi-directional Associative Memory (HTBAM) model is proposed in this letter. Two general energy functions are defined to prove the stability of one class of multi-valued Bi-directional... A Hyperbolic Tangent multi-valued Bi-directional Associative Memory (HTBAM) model is proposed in this letter. Two general energy functions are defined to prove the stability of one class of multi-valued Bi-directional Associative Mernorys(BAMs), with HTBAM being the special case. Simulation results show that HTBAM has a competitive storage capacity and much more error-correcting capability than other multi-valued BAMs. 展开更多
关键词 Bi-directional associative memory Recurrent neural network Multi-value
下载PDF
Operation methods of resistive random access memory 被引量:1
9
作者 WANG Guo Ming LONG Shi Bing +10 位作者 ZHANG Mei Yun LI Yang XU Xiao Xin LIU Hong Tao WANG Ming SUN Peng Xiao SUN Hai Tao LIU Qi Lü Hang Bing YANG Bao He LIU Ming 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第12期2295-2304,共10页
In this paper, different electrical measurement and operation methods of resistive random access memory (RRAM) have been summarized, including voltage sweeping mode (VSM), current sweeping mode (CSM), co lstant ... In this paper, different electrical measurement and operation methods of resistive random access memory (RRAM) have been summarized, including voltage sweeping mode (VSM), current sweeping mode (CSM), co lstant current stress (CCS), constant voltage stress (CVS), rectangular pulse mode (RPM), and triangle pulse mode (TPM). Meanwhile, the effects of these meas- urement methods on the forming, set, reset and read operation as well as endurance performance have been compared. Finally, their respective controllability of various resistive switching parameters have been summar zeal and analyzed. 展开更多
关键词 resistive random access memory operation method voltage sweeping mode current sweeping mode constant currentstress constant voltage stress rectangular pulse mode triangle pulse mode
原文传递
Theory of generalized tautology in revised Kleene system 被引量:15
10
作者 吴洪博 《Science China(Technological Sciences)》 SCIE EI CAS 2001年第3期233-238,共6页
This paper is a complement and extension of the theory of generalized tautology which was first proposed by Wang Guojun in revised Kleene system, Some interesting results are obtained: (i) accessibleα +-tautology and... This paper is a complement and extension of the theory of generalized tautology which was first proposed by Wang Guojun in revised Kleene system, Some interesting results are obtained: (i) accessibleα +-tautology and generalized contradiction which are dual theory to generalized tautology have been introduced; (ii) congruence partition about—has been given in logic system $\bar W$ ,W k ; (iii) in logic systemW k , tautologies can be obtained by employing the upgrade algorithm at most $\left[ {\frac{{k + 1}}{2}} \right]$ times to an arbitrary formula; (iv) in logic system $\bar W(W)$ , tautologies cannot be obtained by employing upgrade algorithm to non-tautologies within finitely many times; (v) the deduction rule $\left( {\left[ {\left( {\frac{1}{2}} \right)^ + } \right] - MP} \right)$ holds in logic system $\bar W(W)$ . 展开更多
关键词 logic system accessibleα +-tautology upgrade algorithm α-contradiction PARTITION
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部