CATV可寻址关断系统

针对现有有线电视CATV网络在网络控制方面存在的盲点,提出了CATV网络可寻址管理方案,并在此基础上构建了CATV可寻址关断系统。该系统根据信令中用户地址和相应操作指令实现对CATV用户终端的程控关断,具有高效性、可靠性、实用性等优点。     

计算机技术在有钱电视收费中的应用

有线电视计算机控制收费系统是对通往用户信号传输通道进行控制处理,信号通道是可寻址的。那么,通过由有线电视收费管理软件、计算机前端控制设备及用户现场的防盗型供电器、可寻址智能分支器等组成的系统,可以对欠费的用户进行可寻址关断,即“路权控制”方式。计算机通过控制前端的数据编码器输出的信号与原有的有线电视信号混合后送入有线电视网络,在用户现场装上防盗型供电器、可寻址智能分支器,计算机控制信号通过有线电视网络送到各个可寻址智能分支器,实现对每个用户的电视信号进行电子开关控制。同时,模块化的软件设计,可根据不同区域的有线电视管理模式进行更改,彻底改变了有线电视收费管理模式,提高了有线电视台的经济效益和工作效率。     

智能网业务控制方法的研究与实现

智能网的优点在于用户可以参与业务的管理和控制,用户可根据需要自己修改工作参数及控制方式.本文探讨了用户利用Internet对IN(智能)业务进行管理和控制的方法,并采用WINCGI编程加以初步实现,弥补了现有语言应答控制方式繁琐、易错的不足,为IN用户提供了一个直观、简洁的业务管理操作界面,便于用户使用IN业务.     

计算机技术在有线电视收费中的应用

有线电视计算机控制收费系统是对通往用户信号传输通道进行控制处理,信号通道是可寻址的.那么,通过由有线电视收费管理软件、计算机前端控制设备及用户现场的防盗型供电器、可寻址智能分支器等组成的系统,可以对欠费的用户进行可寻址关断,即"路权控制"方式.     

一个可审计的离线电子现金方案

提出了一个高效率的可审计的离线电子现金方案, 用户有权控制去除电子现金的匿名性,即使没有可信第三方的存在. 相对于以前提出的可审计电子现金方案,方案的一个优点是银行在查询电子现金的花费者时,可以直接找到相应的用户帐号,而之前的方法都是从银行的整个提取现金的数据库去遍历搜索,导致效率很低.另一个贡献是构造了第一个多面值的可审计的离线电子现金方案.     

功能范畴下产品概念设计阶段用户需求功能的表达

针对产品概念设计阶段获取的用户需求,依据功能的本质不变性,在功能范畴下拟定了用户需求功能抽象的原则,以基本功能集为组成单元,提出了包含运动、能量、控制、关联、综合5种类型基本功能集的用户需求功能矩阵表达方法,并设计相应的表达矩阵简化算法,最后通过实例验证该表达方法的可行性和实用性,并给出了相应的结论和未来需要进一步研究的内容.     

基于STC89C52RC单片机的电疗仪设计

该电疗仪选用STC89C52RC单片机作为控制核心，8路输出方波通过键盘选择，利用单片机的定时和中断功能，再经过信号放大电路而获得。电疗仪的治疗时间可设定，范围为0—40分钟。治疗电信号的强度由用户根据自身的反应情况进行相应调节。     

电气自动化控制设备可靠性测试方法的研究

提高电气自动化控制设备的可靠性一直是用户和生产厂家非常关注的问题。本文简单的阐述了电气设备可靠性的定义、可靠性测试方法,并提出了相应的电气自动化控制设备可靠性测试方法的选择。     

一种基于POMDP用户意图建模的智能轮椅导航控制方法

通过部分可观测马尔可夫决策过程(POMDP)模型对用户意图进行建模,提出了一种基于POMDP用户意图建模的智能轮椅导航控制方法.该方法考虑了动作的不确定性和状态的部分可观测性,对用户意图、智能轮椅导航控制的动作空间进行建模,通过状态预测进而选择行为的最优规划,实现用户期望总值的最大化.首先介绍了POMDP的原理及模型,然后提出了基于POMDP用户意图的智能轮椅控制状态空间、动作空间、观察值集合、奖赏值和概率分布,进而提出了一种基于概率密度函数的用户意图求解方法.最后,对基于POMDP用户意图建模的智能轮椅导航控制进行了试验,并对试验结果进行了分析,从而验证了所提方法的实时性和有效性.     

一种基于网络的远程电路实验教学系统设计

本设计提出了一种基于网络的远程电路实验教学系统,整个系统由控制模块和一套实验电路板组成,开发了以32位ARM微控制器为核心的控制模块,控制模块接入以太网,用户可通过网络对控制模块进行设置和控制,进而实现对实验电路板的控制和数据采集.该实验系统允许用户远程进行电路实验操作,有效提高了实验资源的利用率,可作为电路实验室实验教学形式的重要补充.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that