Real-Time Wind Speed Analysis at Wind-Damaged Tower of a Transmission Line

Affected by the Super Typhoon“Mangkhut,”a total of five base towers of a transmission line in the mountainous area of China collapsed.In this paper,a mathematical model is established based on the Shuttle Radar Topography Mission(SRTM)data near the accident tower.The measured wind speed in the plain area under the mountain is used as the calculation boundary condition.The wind speed at the top of the mountain is calculated by using a numerical simulation method.The design wind speed and calculated wind speed at the tower site are compared,and the influence of wind speed on tower position in this wind disaster accident is analyzed.

Modeling and Statistical Properties Research on Online Real-Time Information Transmission Network

In this paper, the model of the online real-time information transmission network, such as wechat, micro-blog, and QQ network, is proposed and built, based on the connection properties between users of the online real-time information transmission network, and combined with the local world evolving characteristics in complex network, then the statistical topological properties of the network is obtained by numerical simulation. Furthermore, we simulated the process of information transmission on the network, according to the actual characteristics of the online real-time information transmission. Statistics show that the degree distribution presents the characteristics of scale free network, presenting power law distribution, while the average path length, the average clustering coefficient and the average size of the network also has a power-law relationship, moreover, the model parameters has no effect on power-law exponent. The spread of information on the network represents obvious fluctuation scaling, reflecting the characteristics that information transmission fluctuates over time.

Real-time performance of periodic data transmission in EPA industrial Ethernet

To evaluate and improve the real-time performance of Ethernet for plant automation（EPA） industrial Ethernet,the real-time performance of EPA periodic data transmission was theoretically and experimentally studied.By analyzing information transmission regularity and EPA deterministic scheduling mechanism,periodic messages were categorized as different modes according to their entering-queue time.The scheduling characteristics and delivery time of each mode and their interacting relations were studied,during which the models of real-time performance of periodic information transmission in EPA system were established.On this basis,an experimental platform is developed to test the delivery time of periodic messages transmission in EPA system.According to the analysis and the experiment,the main factors that limit the real-time performance of EPA periodic data transmission and the improvement methods were proposed.

Transmission Considerations with QoS Support to Deliver Real-Time Distributed Speech Recognition Applications

Distributed speech recognition (DSR) applications have certain QoS (Quality of service) requirements in terms of latency, packet loss rate, etc. To deliver quality guaranteed DSR application over wirelined or wireless links, some QoS mechanisms should be provided. We put forward a RTP/RSVP transmission scheme with DSR-specific payload and QoS parameters by modifying the present WAP protocol stack. The simulation result shows that this scheme will provide adequate network bandwidth to keep the real-time transport of DSR data over either wirelined or wireless channels.

Development of 16-channels Compact EEG System Using Real-time High-speed Wireless Transmission

For the convenience of people with disability and for normal people, a demand for intelligent interfaces is ever increasing and therefore related studies are actively being conducted. Recently a study is being conducted to develop an interface through face expression, movement of the body and eye movements, and further more active attempts to use electrical signals(brainwave, electrocardiogram, electromyogram) measured from the human body is also actively being progressed. In addition, the development and the usage of mobile devices and smart devices are promoting these research activities even more. The brainwave is measured by electrical activities between nerve cells in the cerebral cortex using scalp electrodes. The brainwave is mainly used for diagnosis and treatment of diseases such as epilepsy, encephalitis, brain tumors and brain damage. As a result, the brainwave measurement methods and analytical methods were developed. Interface using the brainwave will not go through language or body behavior which is the result of the information processed by the brain but will pass directly to the system providing a brain-computer interface (BCI). This is possible because a variety of the brainwave appears depending on the human’s physical and mental state. Using the brainwave with the intelligent brain-computer interface or combining it with mobile devices and smart devices, regardless of space constraints, the brainwave measurement should be possible.[4,7] In this study, in order to measure the brainwave without spatial constraint, 16 channel compact brainwave measurements system using a high-speed wireless communications were designed. It was designed with a 16 channel to classify the various brainwave patterns that appear and for estimating the location of the nerve cells that triggered the brainwave. And in order to transmit the brainwave data within the channel without loss, a high-speed wireless communication must be possible that can enable a high-speed wireless transmission more sufficient than the Bluetooth, therefore, 802.11 compliant Wi-Fi communication methods were used to transfer the data to the PC. In addition, by using an analog front-end IC having a single-chip configuration with real-time digital filters, the miniaturization of the system was implemented and in order to verify the system Eye-blocking was used to observe the changes in the EEG signal.

Development of TaqMan-based Real-time PCR Assay for Detecting Transmissible Gastroenteritis Virus and Its Application in Vaccine Evaluation

[Objective] This study aimed to establish a TaqMan-based real-time PCR assay for detecting transmissible gastroenteritis virus （TGEV）. [Method] Primers and a probe were designed according to the conserved sequence of N gene in TGEV genome. After gradient dilution, the recombinant plasmid harboring the N gene was used as a standard for real-time PCR assay to establish the standard curve. [Re- sult] The results showed that the established real-time PCR assay exhibited a good linear relationship within the range of 102-10^10 copies/ul; the correlation coefficient was above 0.99 and the amplification efficiency ranged from 90% to 110%. The de- tection limit of real-time PCR assay for TGEV was 10 copies/μl, suggesting a high sensitivity; there was no cross reaction with other porcine viruses, indicating a good specificity; coefficients of variation within and among batches were lower than 3%, suggesting a good repeatability. The established real-time PCR method could be ap- plied in quantitative analysis and evaluation of the immune efficacy of TGEV vac- cines and detection of TGEV in clinical samples. [Conclusion] The TaqMan-based real-time PCR assay established in this study is highly sensitive and specific, which can provide technical means for the epidemiological survey of TGEV, development of TGEV vaccines and investigation of the pathogenesis of TGE.

Design and implementation of multi-hop video transmission experiment system in VANET

Abts ract A wireless mutl i-hop videot ransmission experiment system is designed and implemented for vehiculra ad-hoc networks VANET and the rt ansm ission control protocol and routing protocol are proposed. This system in tegrates the embedded Linux system witha n ARM kernel and oc ns ists of a S3C6410 main control module a wirel ss local arean etwork WLAN card a LCD screne and so on.In the scenario of a wireless multi-hop video transmission both the H.264 and JPEG are used and their performances such as the compression rate delay and frame loss rate are analyzed in theory andc ompared in the experiment.The system is tested in the real indoor and outdoor environment.The results show that the scheme of the multi-hop video transmission experiment system can be applicable for VANET and multiple scenes and the transmission control protocol and routing protocol proposed can achieve real-time transmission and meet multi-hop requirements.

A real-time AI-assisted seismic monitoring system based on new nodal stations with 4G telemetry and its application in the Yangbi M_(S) 6.4 aftershock monitoring in southwest China

A rapidly deployable dense seismic monitoring system which is capable of transmitting acquired data in real time and analyzing data automatically is crucial in seismic hazard mitigation after a major earthquake.However,it is rather difficult for current seismic nodal stations to transmit data in real time for an extended period of time,and it usually takes a great amount of time to process the acquired data manually.To monitor earthquakes in real time flexibly,we develop a mobile integrated seismic monitoring system consisting of newly developed nodal units with 4G telemetry and a real-time AI-assisted automatic data processing workflow.The integrated system is convenient for deployment and has been successfully applied in monitoring the aftershocks of the Yangbi M_(S) 6.4 earthquake occurred on May 21,2021 in Yangbi County,Dali,Yunnan in southwest China.The acquired seismic data are transmitted almost in real time through the 4G cellular network,and then processed automat-ically for event detection,positioning,magnitude calculation and source mechanism inversion.From tens of seconds to a couple of minutes at most,the final seismic attributes can be presented remotely to the end users through the integrated system.From May 27 to June 17,the real-time system has detected and located 7905 aftershocks in the Yangbi area before the internal batteries exhausted,far more than the catalog provided by China Earthquake Networks Center using the regional permanent stations.The initial application of this inte-grated real-time monitoring system is promising,and we anticipate the advent of a new era for Real-time Intelligent Array Seismology(RIAS),for better monitoring and understanding the subsurface dynamic pro-cesses caused by Earth's internal forces as well as anthropogenic activities.

Priority-Based Real-Time Stream Coding over Multi-Channel with Packet Erasures

Multi-channel can be used to provide higher transmission ability to the bandwidth-intensive and delay-sensitive real-time streams. However, traditional channel capacity theories and coding schemes are seldom designed for the real-time streams with strict delay constraint, especially in multi-channel context. This paper considers a real-time stream system, where real-time messages with different importance should be transmitted through several packet erasure channels, and be decoded by the receiver within a fixed delay. Based on window erasure channels and i.i.d.(identically and independently distributed) erasure channels, we derive the Multi-channel Real-time Stream Transmission(MRST) capacity models for Symmetric Real-time(SR) streams and Asymmetric Real-time(AR) streams respectively. Moreover, for window erasures, a Maximum Equilibrium Intra-session Code(MEIC) is presented for SR and AR streams, and is shown able to asymptotically achieve the theoretical MRST capacity. For i.i.d. erasures, we propose an Adaptive Maximum Equilibrium Intra-session Code(AMEIC), and then prove AMEIC can closely approach the MRST transmission capacity. Finally, the performances of the proposed codes are verified by simulations.

A Method of Insulator’s NSDD Measurement and Its Device Based on Laser Transmission Principle

Accuracy measurement of the Non-soluble Deposit Density (NSDD) on the insulator surface is very important for the transmission line anti-pollution flashover works. A method to measure the NSDD on double sheds porcelain insulator surface based on laser transmission principle is proposed in this paper. Laser unit and luminous intensity sensor are installed between the up and down surface of the double sheds porcelain insulators, two glass tablets are put between the double sheds. The contamination on the glass tablets will influence the luminous intensity that reaches the intensity sensor. The luminous signal is changed to electrical signal, and the insulator’s NSDD could be obtained based on the difference of luminous intensity. The device can be used in online monitoring of the insulator's NSDD condition on the insulator surface.

信息采集智能车系统设计与实现

在现代社会生活中,信息采集智能车在环境监测、生态研究、地质勘探等诸多领域发挥着重要作用。该文基于ESP32微处理器设计和开发具有自动避障和语音控制功能的信息采集智能车系统,通过在智能车系统搭载多传感器信息采集模块,实现不同位置环境信息的实时采集、传输与显示。经过实际测试,验证系统功能完善,易于使用与扩展。

基于STM32的低功耗高精度智能体温无线检测系统

文章设计了以STM32L051C8T6单片机为核心的低功耗高精度智能体温无线检测系统,实现了高精度的体温监测、人性化智能语音播报、稳定的无线传输、低功耗电源管理等功能。该系统传输稳定,抗干扰能力强,续航持久,低辐射,为父母照顾生病发烧的婴幼儿提供了便利。本系统落实科技改变生活,顺应时代发展,解决千万父母的疑难问题。

基于基音延迟隐写的移动语音信道数据传输

针对移动通信中端到端信息传输的安全问题,文中提出了一种适用于移动语音信道的基于基音延迟隐写的信息传输方法,该方法将目标数据隐藏在语音信号中。算法使用秘密信息控制语音中浊音部分的基音延迟值奇偶特性,以此嵌入数据比特。通过秘密信息对清音部分的基音延迟值进行量化输出,实现隐写信息的嵌入。嵌入引起基音延迟变化并不会造成原始语音音质的严重退化,因此在传输语音信号时,外界难以检测出隐藏的数据信息。该算法可以保证端到端信息传输的安全性和私密性。仿真结果表明,秘密信息的传输速率达200 bit·s^(-1),准确率约为94%。

声音识别技术在广播电视发射台远程监控中的应用

声音识别技术在广播电视发射台远程监控中的应用,不仅显著提升了监控的自动化和智能化水平,而且为确保节目质量提供了有力支撑。首先概述声音识别技术的基本原理,其次详细探讨声音识别技术在远程监控系统中的具体应用,最后通过具体案例分析声音识别技术的应用效果,旨在为广播电视行业的相关人员提供借鉴。

采用柔性铰链的快速反射镜设计

根据激光发射系统对快速反射镜发射方向精度的需求,提出了一种新型快速反射镜设计方案。该方案以柔性铰链为运动传递元件,采用直线音圈电机驱动,并用高精度光栅测微仪实现位置闭环控制。首先,介绍了反射镜工作原理及驱动方式,选择了系统的驱动元件和测角元件,并对柔性铰链结构进行设计。在研究其刚度特性的基础上,采用序列二次规划法优化了铰链关键尺寸。然后,建立了驱动组件的简化模型,并利用理论公式和有限元分析软件分别计算驱动组件的转角精度。最后,使用测角元件及自准直平行光管测量了快速反射镜的转角精度。实验结果表明:所设计的快速反射镜装置工作稳定、结构可靠,对发射光束的控制精度能达到0.95″,满足激光发射系统实时控制光束发射方向的精度要求。

基于蓝牙技术的语音通信传输系统设计

为实现语音的无障碍传输,保持通话的同时摆脱电缆的束缚,并满足语音传输系统反应迅速,可靠性高,系统精度高的要求,提出一种基于C8051F021单片机、蓝牙模块和MC145483语音模块的无线通信系统,系统以蓝牙模块无线传输系统为核心,通过C8051F021单片机、MC145483语音模块的控制,实现语音信息的双向无线通信传输;实验证明,该系统在电磁屏蔽、震动、不稳定的环境下能进行可靠语音通信,为语音无线通信提供了很好的应用依据。

基于现场总线的语音通信混和应用的研究

根据CAN总线技术在煤炭系统的广泛应用,在研究井下的语音信号利用现场总线技术进行传输方法基础上,采用语音处理模块AMBE-2000,微处理器PIC18F258,PCM3500等芯片设计开发了基于现场总线的语音通信模块。并利用RS232B智能转换器构成一个测试系统,完成语音与数据混合传输测试,测试结果表明通过改变控制信息量来检测语音的变化,从而找到最佳匹配,使控制信息在不受影响的前提下,语音传输质量最好。

低成本智能家居系统设计

鉴于现有智能家居产品存在的价格较高的问题,为使智能家居得到推广普及,对智能家居低成本实现方案进行了研究。方案以单片机为主控制器,以语音控制电路为辅助控制。传感器测量电路构成子模块,通过无线传输实现数据处理和相应的控制。系统主要用于对家庭生活环境的监测和对电器设备的系统自动控制和语音识别控制,旨在让家庭生活更加安全便捷。最终测试结果表明,通过对监测模块的数据进行分析处理,有效地实现了对室内外温湿度、室内空气质量、PM2.5、人体红外体温、防火防盗等的监测,同时又降低了整体硬件成本。

加密语音在GSM话音业务信道传输的一种实现方法

移动通信系统的安全现状引发了移动语音安全课题的研究,语音加密是实现端到端语音安全通信的有效措施,但是加密后的语音数据不能直接在移动话音信道中传输。给出了加密语音在GSM话音业务信道中传输的一种实现方法,并针对GSM全速率RPE-LTP声码器,采用语音信号线性预测分析与合成技术,设计了类语音调制解调器,能够实现加密语音数据与类语音信号的可靠转换,解决了加密数据接入移动通信网的问题,并克服了GSM系统代码转换机制及话音激活检测(VAD)模块带来的不利影响,为加密语音在移动话音信道的传输提供了可能。

基于ZigBee的战场数话传输模块的设计与实现

为了实现战场上语音和数据的近距离无线传输,将语音传输与ZigBee无线网络相结合,利用ZigBee技术设计一个小型的无线网络,代替有线通信方式.以IAR的Embedded Workbench为开发平台,设计了控制模块、语音模块、无线通信模块、功率放大模块、数据接口等模块硬件电路.采用RALCWI语音压缩算法保证话音质量,设计了2.4GHz ZigBee网络节点,组成2.4GHz ZigBee小型网络,在网络内自由传输语音和数据,并在软件上实现了语音处理和组网、无线收发数据、数据传输等功能,解决了战场上无线传输的问题.