期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
基于输出域的测试用例自动生成方法研究 被引量:6
1
作者 尤枫 赵瑞莲 吕珊珊 《计算机研究与发展》 EI CSCD 北大核心 2016年第3期541-549,共9页
对大多数软件,很难根据规格说明自动产生期望的输出.而对于某些软件,输出域存在许多值得关注的检测点,适合于从输出域出发开发测试用例.但对于给定的输出,自动生成相应的输入也较为困难.提出了一种基于输出域的测试用例自动生成方法,首... 对大多数软件,很难根据规格说明自动产生期望的输出.而对于某些软件,输出域存在许多值得关注的检测点,适合于从输出域出发开发测试用例.但对于给定的输出,自动生成相应的输入也较为困难.提出了一种基于输出域的测试用例自动生成方法,首先利用BP神经网络构建被测软件的功能模型,然后在被测软件的功能模型上,对于给定的输出,利用遗传算法搜索相应的输入,实现基于输出域的测试用例自动生成.同时,对遗传算法进行了改进,提出了一种新的交叉算子和变异算子,以提高遗传算法生成测试用例效率,并在容错软件RSDIMU子模块和3个常用软件上进行了模型构建及测试生成实验.实验结果表明,利用遗传算法实现基于输出域的测试用例自动生成方法是行之有效的,改进的遗传算法能够提高测试生成的效率和成功率. 展开更多
关键词 BP神经网络 软件功能模型 测试用例生成 输出域 遗传算法
下载PDF
基于人工免疫算法的软件输出域覆盖测试 被引量:3
2
作者 张卫祥 齐玉华 《南京大学学报(自然科学版)》 CAS CSCD 北大核心 2018年第4期742-750,共9页
如何实现软件输出域覆盖,是对安全攸关软件开展功能测试时面临的一个难题.采用智能化软件测试思路,提出了基于人工免疫算法的软件测试数据自动生成方法.首先分析了软件输出域覆盖问题的由来和面临的困难,说明了利用灰盒测试技术将输出... 如何实现软件输出域覆盖,是对安全攸关软件开展功能测试时面临的一个难题.采用智能化软件测试思路,提出了基于人工免疫算法的软件测试数据自动生成方法.首先分析了软件输出域覆盖问题的由来和面临的困难,说明了利用灰盒测试技术将输出域覆盖转化为软件伪路径覆盖的技术途径,并给出了软件测试数据质量评价的度量指标.其次,给出了人工免疫算法应用于软件测试数据生成的基本思路,介绍了人工免疫算法的一般步骤及其与遗传算法的异同分析.然后,分别设计了抗体亲和度评价算子、抗体浓度评价算子、免疫选择算子、克隆算子、变异算子、抑制算子、刷新算子等人工免疫算法的主要算子,实现了基于人工免疫算法的测试数据自动化生成方法.最后,采用三种不同类型软件对方法有效性进行了验证,并对数据命中率、平均迭代轮次以及测试用例总个数等指标进行了分析.结果表明,该方法满足软件输出域覆盖要求,总体效果优于遗传算法和随机测试. 展开更多
关键词 功能测试 人工免疫算法 测试数据生成 软件输出域 软件测试 智能化测试
下载PDF
多域光网络中考虑域间输出策略的分段共享保护算法 被引量:5
3
作者 张盛峰 刘焕淋 黄胜 《半导体光电》 CAS 北大核心 2015年第2期280-284,304,共6页
研究了多域光网络中的路由保护问题。在多域光网络中,域间路由的建立要遵从域间输出策略。在考虑域间输出策略的基础上提出了一种多域光网络中基于路径计算单元的分段共享保护算法。仿真表明,相比传统的基于路径计算单元的多域分段保护... 研究了多域光网络中的路由保护问题。在多域光网络中,域间路由的建立要遵从域间输出策略。在考虑域间输出策略的基础上提出了一种多域光网络中基于路径计算单元的分段共享保护算法。仿真表明,相比传统的基于路径计算单元的多域分段保护算法,该算法阻塞率低,平均保护切换时间短。 展开更多
关键词 光网络 路径计算单元 输出策略 分段共享保护
下载PDF
关于有限域上多输出函数的非线性度
4
作者 孙海燕 吴珠峰 《太原师范学院学报(自然科学版)》 2006年第4期22-24,共3页
给出了与文献[1]中所定义的有限域上多输出函数的非线性度不同的定义,并指出了它的密码学意义,也讨论了两者之间的关系,丰富了多输出函数方面的成果.
关键词 有限上多输出函数 仿射函数 非线性度
下载PDF
基于神经网络的跑道结冰预测 被引量:2
5
作者 赖军杰 陈斌 高德伟 《工业控制计算机》 2018年第8期62-64,共3页
针对机场道面结冰严重影响机场运营及飞行安全的现状,提出了一种基于BP神经网络的积冰预测模型。通过建立室外模拟机场跑道实验平台,控制风速和降水量的变化并进行相应的实验,得到该模型的误差精度在15%左右。相比已有的对道面结冰问题... 针对机场道面结冰严重影响机场运营及飞行安全的现状,提出了一种基于BP神经网络的积冰预测模型。通过建立室外模拟机场跑道实验平台,控制风速和降水量的变化并进行相应的实验,得到该模型的误差精度在15%左右。相比已有的对道面结冰问题初步研究的模型,引入了输出域,有效避免了输出域内小概率预测结果的随机性与不确定性,提高了结冰预测的可靠性和准确性。 展开更多
关键词 BP神经网络 跑道结冰预测 输出域 随机性
下载PDF
基于OFDM的MIMO-TDCS设计及性能研究
6
作者 莫建云 任清华 《电子技术应用》 北大核心 2012年第11期122-125,共4页
针对多输入多输出变换域通信系统(MIMO-TDCS)存在频谱利用率低的问题,基于OFDM系统所使用的FFT/IFFT数据调制解调思想,提出了一种在频域上对TDCS符号进行多数据符号加载的系统。理论上系统能够在一个TDCS符号上传输多个数据符号,能有效... 针对多输入多输出变换域通信系统(MIMO-TDCS)存在频谱利用率低的问题,基于OFDM系统所使用的FFT/IFFT数据调制解调思想,提出了一种在频域上对TDCS符号进行多数据符号加载的系统。理论上系统能够在一个TDCS符号上传输多个数据符号,能有效地提高频带利用率,并且解调过程运用FFT变换可简化解调结构的复杂度。通过仿真分析,验证了在符号传输功率一定并保证一定误码率性能的条件下,基于OFDM的MIMO-TDCS能够有效提高频谱利用率。 展开更多
关键词 多输入多输出变换通信系统 多数据符号加载 调制 频谱利用率
下载PDF
自适应多门限算法的MIMO-TDCS的设计与研究
7
作者 莫建云 任清华 《科学技术与工程》 北大核心 2012年第29期7754-7758,共5页
针对已研究的多输入多输出变换域通信系统(Multiple-input Multiple-output Transform Domain Communication System,MIMO-TDCS)的基函数生成算法,利用了传统的二元判决方法不能准确反应信道质量差别的问题,提出了一种采用自适应多门限... 针对已研究的多输入多输出变换域通信系统(Multiple-input Multiple-output Transform Domain Communication System,MIMO-TDCS)的基函数生成算法,利用了传统的二元判决方法不能准确反应信道质量差别的问题,提出了一种采用自适应多门限基函数生成算法的MIMO-TDCS系统。理论分析表明,此系统能够较好地克服传统二元判决算法不能充分体现各可用子信道质量差别的缺点,充分利用各可用子信道质量差别分配信号功率,提高了系统误码率性能。通过仿真分析,验证了此系统的可行性,以及此系统具有较强的抗干扰能力。 展开更多
关键词 多输入多输出变换通信系统 基函数生成算法 自适应多门限算法 功率分配
下载PDF
Color control of the multi-color printing device 被引量:5
8
作者 WANG Xiao-hua XIU Xiao-jie +1 位作者 ZHU Wen-hua TANG Hong-jun 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第7期1187-1192,共6页
Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some... Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some color-printing systems. It is difficult, however, to model the composed color with the multiple inks when the number of the output ink hues exceeds three due to the none-unique mapping between the color spaces of the CIE Lab and the multi-color printing device. In this paper, we propose a fine color-printing method for multi-color printing device with the ink set of more than three hues. The proposed approach has good color expression ability and provides fine control of the printed color. By dividing the output color space into several subspaces, our method allows one-to-one mapping between the standard color space and the multi-color output color space. It has been proved effective when applied to the digital inkjet printer—Mutoh8000. 展开更多
关键词 Multi-color printing device Color gamut Color space Digital inkjet printer
下载PDF
Urban Economic Cluster Template and Its Dynamics of Beijing,China 被引量:3
9
作者 YANG Zhenshan LIANG Jinshe CAI Jianming 《Chinese Geographical Science》 SCIE CSCD 2014年第6期740-750,共11页
Economic clusters have been a central focus of current urban and regional research, policies and practices. However, a methodology to identify and analyze policy-relevant economic cluster dynamics is still not well de... Economic clusters have been a central focus of current urban and regional research, policies and practices. However, a methodology to identify and analyze policy-relevant economic cluster dynamics is still not well developed. Based on input-output(I-O) data of 1987, 1992, 1997, 2002 and 2007 of Beijing, this article presents an adapted principle component analysis for identifying the evolution of local economic cluster patterns. This research addresses the changes of economic interaction of industries with complementary and common activities over time. The identified clusters provide an insight into the reality of economic development in a diversifying urban economy: the increasing importance of services and the growing interaction between service and manufacturing industries. Our method therefore provides the analysts with a better understanding of the emergence, disappearance and development of economic clusters citywide. The results could be used to assist monitoring urban economic development and designing more practical urban economic strategies. 展开更多
关键词 economic clusters industrial linkages urban economic dynamics functional analysis INPUT-OUTPUT BEIJING China
下载PDF
Spatial Disparity and Efficiency of Science and Technology Resources in China 被引量:2
10
作者 WANG Bei LIU Weidong +1 位作者 LU Dadao ZHANG Jianbo 《Chinese Geographical Science》 SCIE CSCD 2012年第6期730-741,共12页
In the knowledge economy era,science and technology(S&T) resources are getting more and more important in shaping regional competiveness and building regional innovation capacity.As such,the spatial distribution o... In the knowledge economy era,science and technology(S&T) resources are getting more and more important in shaping regional competiveness and building regional innovation capacity.As such,the spatial distribution of S&T resources is a key to understanding regional development and disparities.By designing an input-output indicator system,this paper develops an evaluation model to examine the spatial distribution of S&T resources in China and assess their spatial efficiency.Moreover,the paper tries to explain spatial differences in the efficiency of S&T resources in China.Major findings are:1) the input and output of S&T resources in China shows a clear T-shaped spatial structure,i.e.,concentrated mainly in the coastal region and along the Changjiang(Yangtze) River;2) the efficiency of S&T resources in China displays strong spatial disparities,with the level of efficiency descending from the east to the west while high efficiency appearing in only several clusters;3) the utilization rates of S&T resources in most provinces are quite low,resulting in low efficiency of S&T resources allocation.The paper suggests that the utilization rate of S&T resources should be raised and the commercialization of S&T outputs should be enhanced to improve the efficiency of S&T resources in China. 展开更多
关键词 science and technology resources resources spatial allocation resources-utilization efficiency China
下载PDF
ALGORITHMS AND ARCHITECTURE IMPLEMENTATIONS OF MIMO OFDM BASEBAND RECEIVER BASED ON THE SIMD DSP CORE 被引量:1
11
作者 Hao Xuefei Chen Jie +1 位作者 Zhao Danfeng Zhou Chaoxian 《Journal of Electronics(China)》 2006年第5期763-768,共6页
This letter presents a programmable single-chip architecture for Multi-lnput and Multi-Output (M1MO) OFDM baseband receiver. The architecture comprises a Single Instruction Multiple Data (SIMD) DSP core and three ... This letter presents a programmable single-chip architecture for Multi-lnput and Multi-Output (M1MO) OFDM baseband receiver. The architecture comprises a Single Instruction Multiple Data (SIMD) DSP core and three coprocessors that are used for synchronization, FFT and channel decoder. In this MIMO OFDM system, the Zero Correlation Zone (ZCZ) code is used as the synchronization word preamble of packet in the physical layer in order to avoid the interference from other transmitting antennas. Furthermore, a simple channel estimation algorithm is proposed which is appropriate tbr the SIMD DSP computation. 展开更多
关键词 Multi-Input and Multi-Output (MIMO) OFDM Baseband receiver Zero Correlation Zone (ZCZ) code Single Instruction Multiple Data (SIMD) DSP
下载PDF
A PILOT-ASSISTED NON-CYCLIC PREFIXED MIMO-SCFDE SYSTEM
12
作者 Ren Shubo Guo Junqi Xiang Haige 《Journal of Electronics(China)》 2009年第4期479-486,共8页
A non-Cyclic Prefixed Multiple-Input Multiple-Output Single-Carrier Frequency-Domain Equalization (non-CP MIMO-SCFDE) system based on a recursive algorithm of Joint Channel Es- timation and Data Detection (recursive-J... A non-Cyclic Prefixed Multiple-Input Multiple-Output Single-Carrier Frequency-Domain Equalization (non-CP MIMO-SCFDE) system based on a recursive algorithm of Joint Channel Es- timation and Data Detection (recursive-JCEDD) is proposed in this paper. Unlike the traditional CP MIMO-SCFDE system, the transmitted block of the proposed system is designed in the way that block-type pilot sequences and Single-Carrier (SC) information sequences have been arranged alter- nately without any cyclic prefix before each SC information sequence. Moreover, a recursive-JCEDD algorithm based on interference cancellation is proposed for the corresponding receivers. Simulation results show that the Bit Error Rate (BER) of the proposed system based on the recursive-JCEDD algorithm is lower than traditional CP MIMO-SCFDE or MIMO-OFDM with channel estimation for more than 0.5 dB. 展开更多
关键词 Non-Cyclic Prefixed Multiple-Input Multiple-Output Single-Carrier Frequency-Domain Equalization (non-CP MIMO-SCFDE) Recursive algorithm of Joint Channel Estimation and Data Detection (recursive-JCEDD) Interference cancellation
下载PDF
Flexible Control of Pulsed Power for Biomedical Applications Using PC
13
作者 Masahiro Akiyama Mamoru Suemitsu +4 位作者 Eri Shiraishi Yasuhiro Ohshima Takahisa Ueno Takashi Sakugawa Hidenori Akiyama 《Journal of Chemistry and Chemical Engineering》 2011年第5期410-412,共3页
This work aims to control pulsed power for biomedical fields, which demands sensitive parameters. The pulsed power consists of a voltage rise time of less than 50 ns and charging energy to 1.0 J/pulse; also, the pulse... This work aims to control pulsed power for biomedical fields, which demands sensitive parameters. The pulsed power consists of a voltage rise time of less than 50 ns and charging energy to 1.0 J/pulse; also, the pulse control area includes pulse interval pulse shot number, output voltage. To achieve this system, a pulsed power system exists including software running on PC, universal serial bus (UgB~ for connection, and FPGA controller. Using the software for complex control of pulsed power will enable expansion into various fields with easy operation. 展开更多
关键词 Pulsed power bioelectrics. FPGA MPC industrial application flexible control.
下载PDF
Performance of a two-state quantum engine improved by the superposition effect 被引量:4
14
作者 OU CongJie HUANG ZhiFu +1 位作者 LIN BiHong CHEN JinCan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第10期1815-1821,共7页
The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle.... The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle. By employing the finite-time movement of the potential wall, the power output of the quantum engine as well as the efficiency at the maximum power out- put (EMP) can be obtained. A generalized potential is adopted to describe a class of two-level quantum engines in a unified way. The results obtained show clearly that the performances of these engines depend on the external potential, the geometric configuration of the quantum engines, and the superposition effect. Moreow^r, it is found that the superposition effect will en- large the optimally operating region of quantum engines. 展开更多
关键词 quantum engine superposition effect generalized potential
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部