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MCS51系列单片机存储容量扩展方法 被引量:1
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作者 李香萍 郭继昌 罗批 《电子测量技术》 2001年第1期36-37,共2页
文中介绍一种扩展超容量外部程序存储器(EPROM)和数据存储器(RAM)的方法——体选扩展法并介绍具体的应用实例以及扩展程序存储器时的程序设计技术。
关键词 存储器扩展 体选法 单片机 EPROM RAM
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Optimization model of unascertained measurement for underground mining method selection and its application 被引量:6
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作者 刘爱华 董蕾 董陇军 《Journal of Central South University》 SCIE EI CAS 2010年第4期744-749,共6页
An optimization model of underground mining method selection was established on the basis of the unascertained measurement theory.Considering the geologic conditions,technology,economy and safety production,ten main f... An optimization model of underground mining method selection was established on the basis of the unascertained measurement theory.Considering the geologic conditions,technology,economy and safety production,ten main factors influencing the selection of mining method were taken into account,and the comprehensive evaluation index system of mining method selection was constructed.The unascertained evaluation indices corresponding to the selected factors for the actual situation were solved both qualitatively and quantitatively.New measurement standards were constructed.Then,the unascertained measurement function of each evaluation index was established.The index weights of the factors were calculated by entropy theory,and credible degree recognition criteria were established according to the unascertained measurement theory.The results of mining method evaluation were obtained using the credible degree criteria,thus the best underground mining method was determined.Furthermore,this model was employed for the comprehensive evaluation and selection of the chosen standard mining methods in Xinli Gold Mine in Sanshandao of China.The results show that the relative superiority degrees of mining methods can be calculated using the unascertained measurement optimization model,so the optimal method can be easily determined.Meanwhile,the proposed method can take into account large amount of uncertain information in mining method selection,which can provide an effective way for selecting the optimal underground mining method. 展开更多
关键词 mining engineering underground mining method optimization model unascertained measurement theory information entropy
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语音存储与回放系统
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作者 赵建玉 何芳 《山东建材学院学报》 2000年第1期25-27,共3页
提出了一种以8031单片机为核心的语音存储与回放系统,介绍了系统的组成及软、硬件设计方法。该系统结构紧凑,具有灵活的录音、放音功能;语音音量自动控制功能。采用体选RAM的方法,扩大了存储空间,使语音存储时间可以达到十... 提出了一种以8031单片机为核心的语音存储与回放系统,介绍了系统的组成及软、硬件设计方法。该系统结构紧凑,具有灵活的录音、放音功能;语音音量自动控制功能。采用体选RAM的方法,扩大了存储空间,使语音存储时间可以达到十几秒。结果表明,在音频信号频率为300Hz至3400Hz范围内,系统噪声小,语音回放效果良好。 展开更多
关键词 语音 回放 单片机 体选法 语音存储
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