A new modular design for test and application PCBs of SAW RF filters to ensure precisely predictable filter characteristics

This paper presents the design of an optimized test and application setup for surface acoustic wave (SAW) RF filters. These structures have been investigated, including the test devices, by simulation techniques based on full-wave methods and common SAW simulation methods. In this paper, the simulation technique will be explained in detail, focusing on the interfaces of the simulation models. Parasitic electromagnetic effects in the test and application setup will be analyzed by simulation and measurement. This paper demonstrates the possibility of accurate performance prediction of SAW RF filters using specially designed test setups in the measurement and an optimized application environment, e.g., in mobile phones. Modular parts for such test setups and the application environment are discussed.     

Quantum Communication With Polarization-Encoded Qubit Using Quantum Error Correction

One of the most promising physical properties for implementation of quantum technology is light polarization. However, since light polarization is a fragile property, the use of quantum error correction (QEC) is a crucial issue in order to make quantum information over optical network feasible. In this direction, this paper discusses optical setups for quantum error correction in quantum communication setups based on light polarization. In particular, we show how to use the QEC setup to provide error-free entanglement distribution and its use in an error-free probabilistic teleportation setup. Then, we discuss the performance of the error-correction setup in a very noisy channel. Finally, we show that the same QEC setup can also be used to correct bipartite of qubit states.     

Fiber-optic parametric amplifier in a loop mirror configuration

A configuration of the fiber-optic parametric amplifier (FOPA) using an optical loop mirror is presented and evaluated. Previously presented setups usually suffer a 10-dB loss on the input for the signal wavelength. The setup presented in this letter allows, in principle, virtually lossless combination and separation of pump and signal. In addition, over 30-dB suppression of the pump was achieved in this configuration. Bit-error-rate measurements using the FOPA as preamplifier were compared to a thermal limited receiver. The receiver sensitivity for the FOPA was -30 dBm, which was 10 dB better than the thermally limited receiver.     

Simulating the variability of dispersed large PV plants

A model to simulate the fluctuations generated by a fleet of dispersed photovoltaic (PV) plants solely based on irradiance data measured at one single location is proposed. This simple model has been satisfactorily tested to quantify the power variability of a generic PV fleet, simply by defining two parameters: mean PV plant size and the number of plants in the PV fleet. Specifically, the model provides series of simulated power outputs that may be used in the grid operator simulation programmes, reproducing critical parameters, such as daily maximum fluctuation or the reserves required to offset these fluctuations. The model is created and validated against experimental 1‐s data collected throughout 2013 at six PV plants in Spain dispersed over 1100 km², totaling 17 MWp. Likewise, the model has been succesfully tested against another irradiance dataset, four sites across the state of Colorado, USA, and spread over 2400 km². Copyright © 2015 John Wiley & Sons, Ltd.     

An Electromechanical Film Sensor Based Wireless Ballistocardiographic Chair: Implementation and Performance

New sensor technologies open possibilities for measuring traditional biosignals in new innovative ways. This, together with the development of signal processing systems and their increasing computing power, can sometimes give new life to old measurement techniques. Ballistocardiogram (BCG) is one such technique, originally promising but later replaced by the now very popular electrocardiogram. It’s usability was previously limited by the large size of the devices required to record it, and the complex nature of the recorded signal, which gave little information in visual inspection. In this paper, we present how a lightweight and flexible electromechanical film (EMFi) sensor can be used to record BCG. A ballistocardiographic chair, designed to look like a normal office chair, was built and fitted with two sensitive EMFi sensors. Two different measurement setups to record the signal from the EMFi sensors were developed. The first, so-called wired setup, uses a commercial bio-amplifier, and a special pre-amplifier to interface to it. The latter, so-called wireless setup, uses our own hardware to transmit the recorded digitized signals wirelessly to a nearby PC. Both of these systems are presented and their performance evaluated. Also, the suitability, limitations and advantages of the EMFi sensor over existing sensors and methods are discussed. The validity of the EMFi sensor and amplifier output is tested using a mechanical vibrator. Lastly, a summary of signal analysis methods developed for our system is given. The developed systems have be used for medical BCG measurements, and the recordings indicate that the both the systems are functional and capture useful BCG signal components.     

移动互联网终端发展研究

移动互联网业务的发展,终端是其关键环节之一。本文针对终端硬件及产业链、软件技术及客户业务应用程序等三大方面,对移动互联网终端进行阐述及研究,并相应提出当前发展移动互联网终端产业的分析判断及策略。     

复杂系统高效能仿真技术研究

首先给出了复杂系统高效能仿真技术的内涵和重要作用,并从复杂系统高端建模仿真及为海量用户按需提供云仿真服务两类应用需求的角度,讨论了发展复杂系统高效能仿真技术的技术需求及介绍了相关的国内外技术概况。接着,从高效能仿真建模技术、高效能仿真系统及支撑技术、高效能仿真应用工程技术等三个方面论述了当前复杂系统高效能仿真技术研究中值得关注的9类技术：1）复杂系统高效能仿真语言;2）复杂系统高效能仿真算法;3）高效能仿真系统体系结构;4）高效能仿真硬件优化技术;5）高效能仿真软件支撑技术;6）高效能云仿真技术;7）复杂系统高效能仿真系统VV＆A技术;8）海量数据管理技术;9）复杂系统仿真实验及结果分析与评估技术等技术,包括其研究内容和作者所在团队的研究成果与进一步的研究方向。最后给出几点结论与建议。     

Simulated Fault Injection Using Simulator Modification Technique

In the current very deep submicron technology era, fault tolerant mechanisms perform an essential function to cope with the effects of soft errors. To evaluate the effectiveness of the fault tolerant mechanism, reliability engineers use simulated fault injections using either saboteur modules or mutants in the simulation model. However, the two methods suffer from both inefficiency in the simulation mechanism and difficulties with the experimental setups. To overcome these inefficiencies, we propose the Verilog‐based simulated fault injection (VFI) technique. VFI has the following advantages. First, modification of the design model is unnecessary. Second, the fault injection simulation procedure is simple and efficient. Third, various types of fault injection experiments can be performed. To evaluate the effectiveness of the proposed methodology, we developed a VFI environment using the ICARUS Verilog Simulator. From the experimental results, we were able to qualitatively evaluate the reliability of the target simulation models and to assess the effectiveness of the employed fault‐tolerance mechanisms.     

A saturation-type robust controller for modular manipulators arms

This paper presents a new robust controller for modular and reconfigurable manipulators that require frequent conversion from one setup to another in industrial applications. The proposed robust controller can be integrated with a typical industrial proportional-integral-derivative (PID) controller and only requires the boundaries of the uncertainties of the dynamic parameters of the robotic arm. This makes the proposed controller easy to configure and implement for various setups realized from a reconfigurable robot and guarantees uniform ultimate boundedness of all tracking errors.A numerical analysis is presented to validate the effectiveness of the proposed controller. The performance of the proposed robust controller is compared to that of an independent joint PID controller for two different 3-DOF robotic configurations.     

基于OVPsim嵌入式系统多核仿真教学研究

嵌入式硬件平台多样性和局限性不仅使现阶段的教学实验成本较高,也限制了学生创新实验能力。本文分析研究了基于OVPsim多核仿真系统的原理与特点,构建了可扩展的嵌入式多核仿真平台,并以ARM处理器为例进行了ARM汇编语言教学实验,为嵌入式系统教学实验提供了一个软件模拟真实硬件的环境。实例分析表明基于OVPsim的嵌入式多核仿真平台大大降低了嵌入式系统教学实验的成本,有利于提高学生创新能力。     

基于Verilog-A的陀螺仪接口电路模型及行为仿真

本文分析了MEMS陀螺仪的工作原理,基于Verilog-A硬件描述语言建立了环形二极管解调的陀螺仪接口电路模型,并对电路进行了行为级仿真和实验验证。接口电路模型中的所有模块性能指标由计算推导得出,通过Verilog-A语言定义。本文还研究了接口电路相关参数改变,对系统输出的线性度,电容电压增益,建立时间的影响。该模型为后续硬件设计及优化提供了可靠的参照。     

A DSP-Based Remote Control Laboratory

This paper presents a framework for rapid remote experiment implementation in the field of automatic control. The proposed solution is based on in-house developed embedded control hardware and two commercially available software packages. MATLAB/Simulink is used for rapid experiment control algorithm development, while LabVIEW is used for the user front-end and remote control. A combination of presented hardware and software solutions enables the rapid and easy creation of different interactive remote control experiments. Using this solution, a digital-signal-processor-based remote control laboratory for teaching purposes has been realized. This remote laboratory enables the remote users to easily interact with a set of physical control experiments through the Internet. In the friendly user interface, the remote user can change predefined system parameters and observe system response in textual, graphical, or video format. In addition, this remote laboratory includes a booking system, which enables remote users to book experiments in advance.     

Liberalising Deployment of Internet of Things Devices and Services in Large Scale Environments

There is an ongoing enormous expansion of Internet of Things devices and services in everyday life, notably in novel large scale urban environments called Smart Cities. There, availability and uses of Internet of Things by end users and businesses is mainly palpable subject to prior knowledge of the relevant providers and use of dedicated applications that are associated with them. This current reality can be largely ascribed to the property of “verticality” of autonomous Internet of Things eco-systems in Smart Cities, where Internet of Things devices (e.g. sensor nodes) are connected over a communication infrastructure to service-cloud platforms that deliver and process data that is then presented at the applications level. This paper explains possibilities for revolutionary changes needed towards liberalising deployment and visibility of IoT services and data associated with them. It advocates a conceptual approach termed “horizontal networking for Internet of Things” facilitating a more open and generic presence of Internet of Things through the proposed Internet of Things identification meta-data. The vision is built on needed novel practical features in the current communication setups. The features comprise combinations of the opportunistic and near-match search and discovery model, Internet of Things identification meta-data also reflecting the physical and network-based dimensions of devices’ locations, novel routing and data flow models emerging via Information-Centric Networking and changes required in the elements of the current telecommunication infrastructure and the Internet.     

激光制导武器仿真系统设计与研制

以某激光制导武器为背景,研究了将其导引头实物接入回路的半实物仿真系统的设计与研制。分析了激光制导武器仿真的国内外研究现状,研究了半实物仿真系统设计的需求,根据所选择的激光目标仿真子系统的实现方法,给出了一个易于实现的可靠的激光制导武器半实物仿真系统的设计方案;同时,详细讨论了系统的软硬件研制,对系统的工程实施中遇到的问题和关键技术进行了阐述。目前,该系统已经成功应用于某型激光制导武器的半实物仿真。     

光电化学刻蚀法在整个5英寸硅片上制作均匀深孔阵列

在整个大面积硅片上制作均匀的深孔阵列是光电化学刻蚀中的一大难题。本文中我们首先详细分析了造成深孔阵列不均匀性的两个主要因素,然后提出了一种适合于大面积硅片深刻蚀的新型光电化学刻蚀装置。这套装置通过一个独特的水冷系统和一个花洒状的循环器对传统的光电化学刻蚀装置进行了改进。实验结果显示,借助这套装置能够在整个5英寸硅片上制作出均匀的深孔阵列。深孔阵列的形貌可以通过改变相应的刻蚀参数来进行调整。     

Photoelectrochemical etching of uniform macropore array on full 5-inch silicon wafers

We analyze the two main factors causing non-uniformity of the etched macropore array first,and then a novel photoelectrochemical etching setup for large area silicon wafers is described.This etching setup refined typical etching setups by a water cooling system and a shower-head shaped electrolyte circulator.Experimental results showed that the uniform macropore array on full 5-inch n-type silicon wafers could be fabricated by this etching setup.The morphology of the macropore array can be controlled by ...     

基于FPGA的电力传动实时仿真平台的设计

针对传统电力传动仿真软件如MATLAB/SIMULINK具有仿真时间长、对计算机硬件要求高等缺点,给出了一种针对电力电子装置实时仿真系统的建立方法,通过对带阻感负载的H桥逆变器进行特性模拟,给出了基于System Generator的实现流程。在FPGA内部实现一个SPWM信号发生器、H桥仿真器及阻感负载仿真器,构成一个完整的单相H桥逆变系统。最后在Xilinx公司S3EStarter_ug230 FPGA实验平台上对整个系统进行实时仿真,并采用DAC对仿真波形进行输出显示,结果验证了整个实时仿真系统的正确性。     

战术互联网建模与仿真

战术互联网(TI-TacticalInternet)是移动通信环境下的战术通信网络,是实现战场前沿态势感知(SA-SituationalAwareness)数据和指挥控制(C2-CommandandControl)数据传输的主要通道,也是战术通信的骨干网络。在简单介绍美军战术互联网系统功能与构成的基础上,重点剖析了战术互联网系统建模与仿真的多种设计方案与实现技术,最后,针对我军未来战术通信系统的仿真研究和应用问题,提出了几点思考和建议。     

开发通信系统仿真实验的探索

为解决《通信原理》课程的硬件实验系统存在局限性导致部分实验不能做的问题,采用MATLAB软件仿真的方法,通过两个实例——MPSK系统误码率测试实验和各种数字通信信号功率谱密度分析实验,解决了硬件信号源的随机性产生并弥补了实验系统缺乏滤波器的缺陷,从而达到开发各种通信信号功率谱分析的实验以及各种数字接收机误码率测试的实验...