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本文介绍TC-IIC型公用电话计费器的功能和软硬件的设计情况,它主要采用单片机技术,具有功能多样、结构简单、使用方便的特点。 相似文献
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普通IC卡公用电话系统存在一些明显的缺点,如盗打问题层出不穷。文章详细说明了智能话机和智能平台之间的处理过程,讲述智能公用电关于防盗打方面的设计。 相似文献
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近年来,市场上陆续出现了一些新的公话业务,受到不同层次的客户欢迎.本文针对智能公话、公话超市、多媒体IC卡公话等新型的公话业务,介绍了其技术应用和业务定义,对这几类公话的市场应用与发展前景进行了具体分析,对公话建设提出了建议. 相似文献
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本文介绍TC-IIC型公用电话计费器的功能和软硬件的设计情况,它主要采用单片机技术,具有功能多样、结构简单、使用方便的特点. 相似文献
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新型电话自动监控瓦斯报警器是在固定式瓦斯报警器的基础上开发研制出来的。它具有在瓦斯浓度超限时进行声光报警功能,同时还具有电话自动监控功能。使煤矿安全官员对基层煤矿负责人、安监员、矿主等人员的失职行为进行监管,避免人为因素造成的瓦斯爆炸事故发生。该文介绍了新型电话自动监控瓦斯报警器的组成结构,对其工作原理进行了详细的分析。 相似文献
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What makes a distributed system reliable? A study of failures in the US public switched telephone network (PSTN) shows that human intervention is one key to this large system's reliability. Software is not the weak link in the PSTN system's dependability. Extensive use of built-in self-test and recovery mechanisms in major system components (switches) contributed to software dependability and are significant design features in the PSTN. The network's high dependability indicates that the trade-off between dependability gains and complexity introduced by built-in self-test and recovery mechanisms can be positive. Likewise, the tradeoff between complex interactions and the loose coupling of system components has been positive, permitting quick human intervention in most system failures and resulting in an extremely reliable system 相似文献
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《Ergonomics》2012,55(11):1013-1040
Subjective mood and performance efficiency among operators of public telephone switchboards were studied as a function of interface design and operating procedures. A within-subjects field study was carried out to compare system efficiency within two different types of switchroom; one employing earlier-designed ‘cord’ switchboards, the other employing ‘cordless’ technology in a more ergonomically-designed switchroom. Fifteen subjects were studied, using a minimal intervention technique as they performed their normal operating task, to provide data throughout one working day in either system. EEG and ECG measures were obtained continuously in addition to a variety of sampled performance data and mood ratings. On the cord design of switchboard, operators were found: (i) to carry a consistently heavier workload of concurrent calls; (ii) to be dramatically more responsive to diurnal fluctuations in call-traffic level, while maintaining more stable ‘caller waiting times’ and ‘effective call connections’; (iii) to display these advantages without exhibiting higher levels of physiological stress and (iv) to report consistently higher levels of psychological well-being. From these findings and the results of two earlier studies it is concluded that the cord operators' greater efficiency, and professed higher levels of job satisfaction, derive mainly from the advantages which their more comprehensible and flexible system provides them in attaining and maintaining a high-quality service. 相似文献
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路由策略对电话网的服务质量有重要的影响,应用电话网真实服务过程模型,分析了电话网路由选择方法,定量评估了不同的路由策略对网络服务质量的影响,为电话网路由策略的选择提供了依据。 相似文献
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《Ergonomics》2012,55(11):1041-1052
Subjective mood and performance efficiency among operators of cordless public telephone switchboards were earlier shown to compare unfavourably with similar measures obtained among operators of the previous generation of cord boards. The present study explored the relative responsiveness of the two systems to diurnal fluctuations in call-traffic load, in an attempt to identify more specifically the advantages in cord board design and operation. In both systems information was collected concurrently from the switchroom and its associated ‘service observation room’ by sampling data every 5 min throughout the period of known maximal change in call-traffic load, 11.30-15.30, on 5 successive weekdays. Average workload per operator per 5 min was calculated from recorded call traffic and observed staffing levels. The temporal structure of sampled call-processing was analysed to provide data on ‘time to answer’ (TTA), (call type), (time to record details), (ring-tone received), and (called person answered). Only TTA was significantly related to workload. Overall, TTA was slightly, but reliably, slower for the cord board. However, a regression analysis of TTA on workload established that cordless operation was significantly less stable as workload fluctuated. Alternative explanations of these findings are advanced and the implications of current improvements to both systems are briefly outlined. 相似文献
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给出一种源模型和目标模型间的链接技术及其实现方法,该方法能很好地实现源模型和目标模型间的双向可追踪。既可以对源模型的更新执行正向转换,还可以实现目标模型向源模型的逆向转换。 相似文献
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Naomi Karten 《Information Systems Management》2004,21(4):43-44
Service level agreements (SLAs) are formal negotiated agreements that enable IT organizations and their customers to collaboratively identify, discuss, and manage IT service expectations. Despite their potential, however, not all SLAs are successful. Based on experiences with numerous companies, the author argues that a tendency to “overcomplexify” is a major cause for SLA efforts to fail. 相似文献
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三态电路在FPGA应用设计中的分析 总被引:1,自引:0,他引:1
本文就三态电路在FPGA中的应用作了详细的说明。文章首先描述了一个调用lpm中三态电路模块的VHDL程序,这个程序会出现编译不能通过的问题。然后从这个问题出发,通过尝试三态电路应用的几种不同的具体实现方法,分析了问题产生的原因,并介绍了避免问题的产生的措施。 相似文献