基于IIC和云服务器的智能家居控制系统设计

智能家居普遍采用无线通信技术对家居进行互联,不同的通信方法对智能家居系统的稳定性、便捷性、可靠性有很大的影响;针对智能家居的访问方式,通过对比不同的无线通信技术,选择合适的技术运用在智能家居系统的设计中,实现局域网和广域网两种访问方式;在无线传输的智能家居基础上,使用IIC总线进行功能扩展,使用云服务器来替代传统计算机服务器,增加了系统的灵活性和手机访问的快捷性,更好地实现家庭住宅管理与监测,为我们平时的生活提供便利和保护。     

分布式网络化测试系统的中心服务器技术与研究

为了实现测试系统的网络化、开放化和标准化 ,基于传感器振动测试平台远程实物实验系统提出一种具有开放与互联能力的分布式网络化测试系统体系结构 ,并在逻辑上将该体系结构划分为测控中心服务器、测试服务器和标定服务器。中心服务器是分布式网络测试系统的核心逻辑组成单元 ,是系统中事务响应和处理中心。该服务器向上服务于测试用户 ,提供测试请求响应服务 ;向下管理、控制和协调测试服务器与标定服务器进行工作 ,完成具体的测试请求和测试服务。文章给出了中心服务器的组建方案 ,并重点阐述了中心服务器的体系结构、组件应用技术及组件接口 ,同时也对其关键技术进行了介绍。     

路边停车场管理系统的研究和实现

针对智慧城市建设对智能交通的需要,设计了一种基于物联网技术的智能路边停车场管理系统;该系统采用地磁传感器作为信息采集设备,利用ZigBee和GPRS无线通信技术实现数据的远程传输;应用MySQL数据库、tomcat 6.0服务器搭建后台信息管理服务器,实现对多个路边停车场的统一管理;实地测试表明,系统稳定可靠,检测准确率达到了98%,成功实现了信息的实时及时发布和智能化管理,可以应用于实际的城市路边停车场管理。     

基于Linux的文件加密传输技术

为实现Linux系统服务器端与客户端的文件加密传输,对RSA加密算法和Linux系统线程池技术进行了研究。通过在Linux上配置安装Openssl库来实现非对称RSA加密过程,并且利用线程池技术处理一个服务器与多个客户端的文件传输过程。最终实现了嵌入式ARM客户端与Linux服务器端的网络连接功能,并完成了基于TCP/IP协议上的文件加密以及传输过程。结论表明使用SSL协议设计的加密系统能够完成加密和传输过程,充分保障资料的私密性,并且能够方便的移植到安全级别需求高的嵌入式系统。     

基于即时通讯的电梯远程呼叫系统设计

为实现电梯远程呼叫的应用目标,对即时通讯机制进行了分析,将即时通讯工具引入电气控制领域,提出了基于即时通讯的电梯远程呼叫系统;设计并实现了即时通讯服务器/数据库、电梯终端与用户终端三层架构的通讯系统,给出了三方之间网络通讯实现时的信息交互架构;经过测试,该系统满足一般工程应用的需求,提升了电梯系统的整体运行质量与效率;在即时通讯技术的应用与电梯物联网技术的发展上有一定的参考价值和推广价值。     

基于W态的跨中心量子网络身份认证方案

利用量子隐形传态原理和量子纠缠交换技术,提出了基于W态的跨中心量子网络身份认证方案,实现了分布式量子通信网络中对客户的身份认证.该方案分为注册阶段和身份认证阶段,认证系统包括主服务器和客户端服务器.客户所有的操作都在客户端服务器上进行,不直接与主服务器进行通信.身份认证全部由服务器根据量子力学原理进行,保证了认证方案的安全性.最后,对该方案进行了安全性分析.     

基于W态的跨中心量子网络身份认证方案

利用量子隐形传态原理和量子纠缠交换技术,提出了基于W态的跨中心量子网络身份认证方案,实现了分布式量子通信网络中对客户的身份认证.该方案分为注册阶段和身份认证阶段,认证系统包括主服务器和客户端服务器.客户所有的操作都在客户端服务器上进行,不直接与主服务器进行通信.身份认证全部由服务器根据量子力学原理进行,保证了认证方案的安全性.最后,对该方案进行了安全性分析.     

基于JSP技术的触摸屏实验信息系统

阐述了一种基于JSP技术的触摸屏实验信息系统。该系统的构建重点考虑了通过JSP、JDK与JDBC技术相结合,建立实验信息数据库,在网页上执行SQL命令,使用触摸屏实现查询、添加和删除服务器上实验信息数据库的内容。     

基于PLC模块的船舶监控仿真系统实现

以西门子S7-300系列PLC为核心模块设计船舶监控仿真系统,实现了PLC下位机程序设计,基于Prodave软件包和Profibus总线实现数据通信传输功能,实时采集船舶航行信息、设备运行信息等数据到PC上位机。在船舶综合信息平台网络和数据库系统的基础上,综合运用虚拟现实技术、计算机建模技术、故障诊断技术、信息集成、网络信息技术等技术手段开发了基于PLC模块的船舶监控仿真系统。该系统可以有效地降低船舶工作人员的劳动强度,提高其工作效率,还可以对船舶人员进行基础技能训练、船舶管理训练、故障诊断与排除训练等。     

基于云服务器的地磁感应电流监测系统的设计

地磁暴引起的地磁感应电流(GIC) 可能引起变压器直流偏磁, 对电网的安全稳定运行带来威胁, 远程实时监测GIC对电网的GIC防御具有重要的指导意义。设计了一种基于云服务器的电网GIC远程监测系统, 数据采集终端实时采集变压器中性点的GIC, 多监测点数据经GPRS分端口发送至云服务器的内网进行存储, 用户可通过云服务器的公网IP远程访问并对数据进行绘图、下载等处理, 实现了电网GIC数据的实时发布与共享。结合空间天气的预测数据, 还可以初步实现GIC的预警。对系统的数据采集终端以及基于云服务器的监测软件平台两大模块进行了实验室及变电站现场测试, 测试结果表明该系统实现了设计要求, 满足功能需求。     

"Alternative medical therapy" use among singers: prevalence and implications for the medical care of the singer.

Singers are extremely conscious of health problems that affect their voices and well-being and often take an active role in seeking care for these problems. They frequently seek treatment from providers or with modalities considered "alternative" to traditional medical care. A survey of singers was completed to elucidate their attitudes and practices regarding "alternative modalities" of medical care. Frequently singers will self-medicate or take advice from people not well versed in the special needs of a professional voice user. They will fail to share this information with the physician when seeking "traditional" medical care. These practices may predispose the singer to suboptimal or even dangerous care. These results are discussed, as well as the implications for the medical physician treating the singer. The possible detrimental pharmacologic effects of "natural therapies" widely used by singers are presented, with special attention to the particular concerns for the professional singer.     

A scale value for the balance inside a historical opera house

In the framework of opera house acoustics, the term "balance" refers to the acoustical competition between the singer on the stage and the orchestra in the pit. The mechanism allowing the operatic singers to be heard over the orchestra has to do with their skill in enhancing the vocal emission by a peculiar use of the formant frequencies. This vital factor is sensed by the listeners and, apart from the obvious sound power ratio of the stage and the pit sources, is the main cue that helps to formulate a subjective impression of the balance. To achieve its objective qualification, two calibrated sound sources can be placed on the stage and in the pit, respectively, and their sound level difference is measured at the listeners' seats. The scope of this work is to investigate the relationship between the subjective impression and the objective indicator of the balance and to develop a scale value for the parameter in the case of a historical opera house. For this scope a set of acoustical data from the Teatro Comunale in Ferrara will be used to create synthetic sound fields with controlled conditions of the balance between the stage and the pit. This methodology employs an anechoic piece for soprano (with piano accompaniment) and is implemented in a dead room equipped with an acoustical rendering system. The sound fields are used to investigate the appropriate balance values by means of listening tests. The results of the scaling exercise show that a suitable range of values can be extracted and that the sound from the stage and the pit is perceived as balanced when the loudness difference between the two is comprised within -2.0 dBA and +2.3 dBA.     

Voice source characteristics in Mongolian "throat singing" studied with high-speed imaging technique, acoustic spectra, and inverse filtering.

Mongolian "throat singing" can be performed in different modes. In Mongolia, the bass-type is called Kargyraa. The voice source in bass-type throat singing was studied in one male singer. The subject alternated between modal voice and the throat singing mode. Vocal fold vibrations were observed with high-speed photography, using a computerized recording system. The spectral characteristics of the sound signal were analyzed. Kymographic image data were compared to the sound signal and flow inverse filtering data from the same singer were obtained on a separate occasion. It was found that the vocal folds vibrated at the same frequency throughout both modes of singing. During throat singing the ventricular folds vibrated with complete but short closures at half the frequency of the true vocal folds, covering every second vocal fold closure. Kymographic data confirmed the findings. The spectrum contained added subharmonics compared to modal voice. In the inverse filtered signal the amplitude of every second airflow pulse was considerably lowered. The ventricular folds appeared to modulate the sound by reducing the glottal flow of every other vocal fold vibratory cycle.     

Can listeners hear who is singing? A comparison of three-note and six-note discrimination tasks

Timbre is typically investigated as a perceptual attribute that differentiates a sound source at one pitch and loudness. Yet the perceptual usefulness of timbre is that it allows the listener to recognize one sound source at different pitches. This paper investigated the ability of listeners to identify which pitch in an ascending or descending sequence of three or six stimuli was sung by a different singer. For three-note sequences, the task was extremely difficult, and with rare exceptions, listeners chose the most dissimilarly pitched stimulus as coming from the oddball singer. For six-note sequences, the detection of the oddball singer was much improved in spite of the added complexity of the task. These results support the idea that timbre should be understood as a transformation that connects the different sounds of one source and that a "rich" set of sounds is necessary to discover the trajectory.     

Computer model investigations on the balance between stage and pit sources in opera houses

The acoustical balance between the singer on the stage and the orchestra in the pit is typically found inside an opera house. The competition of the two sources is crucial, since in an opera the singer and the orchestra are performing at the same time. This topic of balance is receiving increasing attention in recent years, but several aspects are still to be clarified. The aim of this work is twofold: firstly the procedure for the acoustical qualification of the balance between the singer and the orchestra is investigated and secondly the means of controlling the balance at the design stage or during renovations is considered. For both tasks the study was conducted in a group of opera houses modelled within an acoustical CAD program. As regards the qualification of the balance this investigation compares the directional characteristics of two loudspeakers and of a dodecahedron omnidirectional loudspeaker in the emulation of a soprano during simulated room acoustics measurements. It is shown that, in order to emulate a soprano singer, the directional characteristics of the source on the stage are quite important. The control of balance was also studied and the work reserves a special emphasis to the case of historical opera houses. In fact, when such theatres are refurbished, the range of possible architectural interventions is often limited to the orchestra pit only, due to the heritage nature of the hall which prevents from any substantial change in the area of the forestage. For this reason it is important to investigate the effectiveness of such limited interventions in the pit, and this is done here by a detailed study of the effects on balance of some major changes of the orchestra pit only.     

Determination of gas concentrations and temperature in the exhaust of a power plant with a cw chemical HF laser

A cw chemical hydrogen fluoride laser system was used to investigate the exhaust of a gas and garbage burning power plant for the period of three months. The concentration of water vapor and carbon dioxide as well as the temperature in the exhaust was measured online with a time resolution as small as 5 ms. The temperature could be determined with a relative accuracy of better than 0.1 K over an averaging time of 9 s. This high accuracy together with the fast response make the system well suited not only for industrial combustion control but also for remote and precise measurement of temperature profiles.     

“Alternative medical therapy” use among singers: Prevalence and implications for the medical care of the singer

Singers are extremely conscious of health problems that affect their voices and well-being and often take an active role in seeking care for these problems. They frequently seek treatment from providers or with modalities considered “alternative” to traditional medical care. A survey of singers was completed to elucidate their attitudes and practices regarding “alternative modalities” of medical care. Frequently singers will self-medicate or take advice from people not well versed in the special needs of a professional voice user. They will fail to share this information with the physician when seeking “traditional” medical care. These practices may predispose the singer to suboptimal or even dangerous care. These results are discussed, as well as the implications for the medical physician treating the singer. The possible detrimental pharmacologic effects of “natural therapies” widely used by singers are presented, with special attention to the particular concerns for the professional singer     

基于3D打印机控制结构的自动进样器系统设计

自动进样器现已大量应用于分析用仪器设备中。为了实现更快速、高效、智能化的进样,在传统进样器基础上设计了一种基于3D打印机控制技术的液相自动进样器控制系统。设计将三轴联动技术应用于进样器瓶号定位,电机加减速的S形曲线优化方案确保针架起停的稳定性和定位的精度。触摸屏的添加,可将进样器单独使用,增强了人机交互能力,同时还支持485联机通讯离子色谱仪等专用分析仪器,操作的详细提示也可杜绝用户误操作。驱动电路方面采用双极型电机专用控制芯片DRV8825,改进系统的整体结构与组成,优化主控与驱动电路的控制设计。进样器具有结构简单,操作方便,应用面广,自动化和智能化程度高,制造与维护成本低等优点。实际应用测试表明,该系统拥有良好的稳定性,系统整体性能大大提高,满足了设计需求,达到了设计要求。     

用光波导光模光谱技术研究DNA-DNA结合蛋白相互作用

探讨了应用光波导光模光谱(Optical waveguide lightmode spectroscopy,OWLS)技术研究DNA-DNA结合蛋白相互作用的可行性和灵敏性。以固定在传感器芯片表面的DNA探针为捕捉分子,溶液中同时含有探针结合序列和NF—κB结合位点序列的寡核苷酸与NF-κB亚单位p50同源二聚体形成的DNA-蛋白质复合物为检测分子,用光波导光模光谱检测技术建立非标记DNA-DNA结合蛋白相互作用检测研究体系。利用这一体系对不同样品中NF-κB p50浓度和具不同NF-κB结合位点序列的寡核苷酸与NF-κB p50亲合和力进行检测。样品中低至0．33 nmol/1的NF-κB p50被光波导光模光谱检测出,不同的NF-κB结合序列与NF-κB p50亲合力有显著的差异。研究发现,光波导光模光谱技术可以用于DNA-DNA结合蛋白相互作用研究,所建立的非标记检测研究体系可以进行样品中结合蛋白含量高灵敏检测和核酸序列与结合蛋白的亲合力的检测研究。     

Discrimination Functions: Can They Be Used to Classify Singing Voices?

Researchers long have searched for invariant acoustic features that can be used to identify singing voice categories or even individual singers. Few researchers have examined how listeners perceive singing voice categories or individual voices. Timbre, the most studied perceptual dimension of the singing voice, is generally believed to vary systematically between singing voice categories but is often assumed to be invariant with an individual singer. To test this assumption, 2 mezzo-sopranos and 2 sopranos were recorded singing the vowel /a/ on the pitches A3, C4, G4, B4, F5, and A5. Trials of three stimuli were constructed. Two of the three stimuli in each trial were produced by the same singer at two different pitches (X₁ and X₂), while the third stimulus was produced by a different singer (Y). Three X₁X₂ conditions were created: (1) G4, B4; (2) C4, F5; and (3) A3, A5. For each singer and each condition, Y was varied across the three remaining singers and across all six pitches. Experienced and inexperienced listeners were asked to identify which stimulus was produced by the “odd” person. The ability to correctly choose the odd person varied greatly depending on pitch factors, suggesting that the traditional concept of an invariant timbre associated with a singer is inaccurate and that vocal timbre must be conceptualized in terms of transformations in perceived quality that occur across an individual singer's range and/or registers.