Wireless Device Connection Problems and Design Solutions

Users, especially the non-expert users, commonly experience problems when connecting multiple devices with interoperability. While studies on multiple device connections are mostly concentrated on spontaneous device association techniques with a focus on security aspects, the research on user interaction for device connection is still limited. More research into understanding people is needed for designers to devise usable techniques. This research applies the Research-through-Design method and studies the non-expert users＇ interactions in establishing wireless connections between devices. The ＂Learning from Examples＂ concept is adopted to develop a study focus line by learning from the expert users＇ interaction with devices. This focus line is then used for guiding researchers to explore the non-expert users＇ difficulties at each stage of the focus line. Finally, the Research-through-Design approach is used to understand the users＇ difficulties, gain insights to design problems and suggest usable solutions. When connecting a device, the user is required to manage not only the device＇s functionality but also the interaction between devices. Based on learning from failures, an important insight is found that the existing design approach to improve single-device interaction issues, such as improvements to graphical user interfaces or computer guidance, cannot help users to handle problems between multiple devices. This study finally proposes a desirable user-device interaction in which images of two devices function together with a system image to provide the user with feedback on the status of the connection, which allows them to infer any required actions.

西门子PLC I-Device Connection与S7 Connection在条烟与烟箱输送线中的应用

本文详细介绍了基于工业以太网的西门子PLC中PROFINET IO IDevice Connection与S7 Connection混合连接的组态与编程方法,并成功应用于杭州卷烟厂条烟与烟箱输送线,实现了既能在子站独立控制,又能在主站集中控制管理的模式,较好地适用于车间生产流水线。该系统具有实时交互能力强,投入管理时间少,系统可靠性高的特点,在其中某一个子站或多个子站掉站的情况下,系统还能保证其他节点正常运行。

Device link profile浅谈

Device link profile是由源色空间直接转换到目标色空间的一种转换用特性文件，一般用于颜色由一个输出设备直接转换到另外一个输出设备。我们知道，一般情况下，在色彩管理实施的时候颜色转换是要经过连接空间（Profile Connection Space，PCS）进行转换的，即先把源色彩空间的颜色转化到Pcs空间，再由PCS空间转换到目标色空间，见图一。连接空间一般是与设备无关的空间，一般是LAB色空间或者XYZ色空间。而用Device link pronle进行颜色转换则不需要经过PCS空间，直接在设备之间建立联系。

The ASD that Wouldn’t Go Away:An Unusual Case of ASD Device Failure in a Patient with Marfan Syndrome

Marfan syndrome patients have connective tissue abnormalities that predispose them to intracardiac defects and postoperative complications.We present a case of late onset ASD device failure secondary to device movement within the atrial septum in a girl with Marfan syndrome.This case study suggests that further studies are necessary to determine the optimal device and approach for ASD repair in this patient cohort.

A Framework for Multi-Hop Ad-Hoc Networking over Wi-Fi Direct with Android Smart Devices

The wide diffusion of mobile devices that natively support ad hoc communication technologies has led to several protocols for enabling and optimizing Mobile Ad Hoc Networks (MANETs). Nevertheless, the actual utilization of MANETs in real life seems limited due to the lack of protocols for the automatic creation and evolution of ad hoc networks. Recently, a novel P2P protocol named Wi-Fi Direct has been proposed and standardized by the Wi-Fi Alliance to facilitate nearby devices’ interconnection. Wi-Fi Direct provides high-performance direct communication among devices, includes different energy management mechanisms, and is now available in most Android mobile devices. However, the current implementation of Wi-Fi Direct on Android has several limitations, making the Wi-Fi Direct network only be a one-hop ad-hoc network. This paper aims to develop a new framework for multi-hop ad hoc networking using Wi-Fi Direct in Android smart devices. The framework includes a connection establishment protocol and a group management protocol. Simulations validate the proposed framework on the OMNeT++ simulator. We analyzed the framework by varying transmission range, number of hops, and buffer size. The results indicate that the framework provides an eventual 100% packet delivery for different transmission ranges and hop count values. The buffer size has enough space for all packets. However, as buffer size decreases, the packet delivery decreases proportionally.

Structural connection with predetermined discrete variable friction forces

This paper presents a simple and practical structural connection able to develop predetermined discrete variable friction forces at target design displacement levels. The innovative connection is termed Modified Friction Device ( Modified FD ). Modified FDs are used to transfer the seismic induced horizontal forces from the floors to the core wall seismic force-resisting system of a building. The schematics of the physical embodiment of the Modified FD are presented. The components and the assembly of the Modified FD are discussed. The mechanics of the Modified FD are explained. Results from static structural analyses of two types of finite element models of the Modified FD are presented. The first model is developed using solid finite elements and it is used to assess the expected kinematics and the expected force-displacement response of the Modified FD. The second model is developed using a truss finite element and it can be used to effciently simulate the force-displacement response of the Modified FD in numerical earthquake simulations of structural systems. The force-displacement response of the Modified FD computed using a numerical earthquake simulation of an eighteen-story reinforced concrete core wall building model is presented. The seismic response of the building model with Modified FDs is compared with the seismic response of the building model with monolithic connections and the seismic response of the building model with friction devices with constant friction forces. The results presented in this paper show that it is possible to develop a simple and practical structural connection with predetermined discrete variable forcedisplacementresponse to limit the seismic induced horizontal forces transferred between the floors of the flexible gravity load resisting system and the core wall piers in high-performance earthquake resilient buildings.

既有建筑装饰面板连接构造强度的检测装置应用研究

商业建筑外墙表面装饰一般采用装饰板作为装饰维护构件,这是充分考虑了建筑主体的实际需要和建筑美观的结果,装饰面板拥有着丰富的外饰效果和满足建筑功能的优点,深受建筑师的青睐,但装饰面板的牢固问题也愈发突出,时常发生装饰面板连接构件失效,造成高空坠物的伤害事故发生。为此,本文将对通过实践方式发明的一种装饰面板连接强度检测装置的优缺点进行研究,以期为今后项目的装饰面板连接强度的检测工作提供一些参考。

高速铁路接触网高可靠性电连接装置研究

为实现高速电气化铁路高可靠性接触网核心零部件国产化与产业化目标,本研究主要针对高铁接触网核心装置中的电连接装置进行研究。首先,提出了装置结构形式的优化思路;其次,通过力学仿真分析验证了产品模型的力学性能和可靠性,并根据仿真结果不断对设计方案进行优化;最后,设计一款高可靠性与高稳定性的电连接装置。该装置可为后续强风地区电气化铁路建设、既有线路提速改造提供有力的技术支持。

Preload relaxation analysis and reliable life prediction of space connection and separation device based on accelerated degradation tests

The safety and reliability of space connection and separation device has become a key issue due to the increasing service span of deep space exploration mission.The long-term preload relaxation(a key failure mode)of connection and separation devices is focused in this paper.A series of tests have been designed and implemented to investigate the preload relaxation regulation and a comprehensive method has been constructed to analyze and predict the reliable lifetime of the device.The two-stage preload relaxation law of the device is found and reasonably considered.Due to the different relaxation mechanism,the first-stage preload relaxation is assessed based on the working-condition test results,and the second-stage preload relaxation is characterized by accelerated test results.Finally,the service reliability and reliable life are evaluated.The experiment and assessment results demonstrate the reasonability and effectiveness of the proposed method which can achieve long-service reliability analysis for space connection and separation device within limited time.

适用于LNG装车臂的四爪快接装置

为解决三爪快接装置存在结构较长、质量较大、与LNG槽车对接时卡爪压到安装孔等问题,对适用于LNG槽车的快速对接技术进行研究。采用理论计算结合试验验证的方法,优化设计了一种适用于LNG装车臂的四爪快接装置,除具有三爪快接装置良好的传动性能、自锁功能、防震动功能、槽车直连功能、流动阻力小、密封性能好、对密封面要求低等优点外,还具有较短的结构长度、更轻的质量、更小的操作力、压紧杆可完全避开LNG槽车接口法兰安装孔等特点。采用四爪快接装置替代原来的松套法兰与槽车对接,不仅能够显著缩短装车臂与槽车的连接时间,提高装车的效率,还大幅减轻了人工劳动强度,使用效果比三爪快接装置更好。

工字钢新型快速套接装置的研制

为适应不同中小跨径桥梁的抢修需求,提出研制工字钢新型套接装置实现工字钢的快速接长,明确了套接装置总体结构和承载要求,自此基础上设计了套接装置的三种连接方式,基于足尺模型试验探究快速套接装置连接工字钢的最优方式。研究结果表明:相较于注胶连接、灌浆连接,套接装置采用“预留开槽+现场槽孔塞焊”的连接方式,既可以保证其具有不低于工字钢的承载力,又能实现不同跨径应急钢桥的快速连接。

基于等效励磁电感的SiC串联器件型中压双有源桥变换器的软开关技术

基于SiC串联器件的双有源桥变换器因具有开关损耗小、功率密度高、能量控制简单等优势,有望成为中压变换场景中实现高频隔离的优选方案。为保证SiC串联器件的可靠均压,各器件上并联大容值缓冲电容,然而该设计使变换器在传输功率较低时难以实现零电压开通,严重影响变换器的整体效率和串联器件的可靠运行。该文通过构建SiC串联器件型中压双有源桥变换器多模态运行模型并深入分析其运行特性,提出一种基于等效励磁电感的无源软开关技术。所提技术可通过优化外接传输电感位置的方式实现中压侧等效励磁电感参数调节,从而在无额外控制前提下实现SiC串联器件的软开关范围扩展。最后,设计了4 kV/1 kV实验样机,实现了100 kW下运行。实验结果显示,所提出的软开关技术能显著地扩展变换器中SiC串联器件的软开关范围,在保证SiC串联器件均压稳定性的同时能够大幅降低变换器在轻载运行时的功耗。

UHPC直拉试验方法与本构关系研究

超高性能混凝土(Ultra-high performance concrete, UHPC)单轴拉伸(直拉)试验是分析UHPC抗拉性能和直拉本构关系的基础性试验,经过对其试件形状与尺寸的优化,试验成功率已得到了较大提升。但由于试件连接方式和局部加强方式的差异,各机构试验成功率参差不齐。为进一步保证直拉试验成功率,采用试验研究和数值模拟的方法系统分析了常见的四种试件连接方式和三种试件局部加强方式对试验成功率的影响,比选出最优试验方法。结果表明:面内夹持装置具有连接可靠、操作简单的优点,适合推广。但夹具的尺寸加工误差或微变形可能导致其与试件的接触面变窄、加剧夹持引发的试件应力集中,致使主裂纹位于测距范围之外;试件与夹具的接触区域进行柔性加强(粘贴碳纤维布)和刚性加强(粘贴铝片)均能有效解决上述问题,提高试验成功率。此外,采用比选的直拉试验方法,探究了钢纤维长径比和体积率对UHPC直拉损伤本构关系的影响。通过声发射(Acoustic emission, AE)监测探究了UHPC在直拉荷载作用下的损伤演化规律,利用声发射参数(累积计数比)构建损伤因子,得到了考虑钢纤维影响的UHPC直拉损伤本构关系。

热电器件界面性能的研究现状

近年来,基于塞贝克效应的热电技术不断取得进展,热电器件已在多个领域得以运用。然而热电器件的各连接界面存在诸多挑战。尤其是热电材料与电极的界面处在实际运用中面临电阻、热阻高,接头处易老化失效等问题。这使得热电器件的转化效率远低于理论值,可靠性不足以支持其工业化运用,热电材料的器件化进程严重滞后于新型热电材料的开发进度。为此,本文重点归纳总结了热电器件中热电材料与电极连接界面的电传输、热传输、连接性能的评估指标及相关理论,并详细介绍了各指标的测定方法和一些常见的优化策略,以期扩展热电器件的界面研究,提升热电器件的综合性能,扩大热电器件的应用范围。

装配式剪力墙新型水平连接装置的力学性能数值模拟

为了研究装配式剪力墙新型水平连接装置的力学性能,对两组不同螺栓数量的连接装置试验组进行了动态力学性能试验,并采用ABAQUS有限元软件对其进行相关数值模拟,进一步分析了较大预紧力对装置力学性能的影响.试验结果表明:通过增加螺栓数量和螺栓预紧力,可有效提升水平连接装置的耗能效果,但加载频率对其影响较小.通过分析有限元结果可知:装置最大水平力,耗能能力及割线刚度与螺栓预紧力呈近似线性增长趋势,与试验数据吻合较好;在较大预紧力情况下,各力学性能指标保持上升趋势,但由线性关系逐渐向非线性过渡的范围也随之增大.

适用于机-网谐振抑制的集中式有源阻尼装置及其控制策略

针对并网逆变器(机组)接入弱电网时电网阻抗的宽范围变化可能导致系统不稳定的问题,通过在公共耦合点处并联集中式有源阻尼装置使其模拟阻尼电阻的外特性,可实现对并网逆变器和电网之间的谐振的抑制。为此,提出1种基于有源阻尼装置的虚拟阻抗值自适应调节方法,既可保证系统稳定性,又使有源阻尼装置中流过的电流尽可能小;提出1种对电流谐波基准的补偿方法,能够减小电流闭环对虚拟阻抗特性的影响,进一步改进阻尼效果。在实验室搭建1台5kW并网逆变器和1台1kW有源阻尼装置,验证了所提控制方案的有效性。

基于有源箝位的功率器件串联均压技术

功率器件串联的关键技术挑战是如何实现串联器件的动、静态均压。提出一种基于有源箝位的器件串联均压电路及其控制方法。所述均压电路仅由1个辅助开关管和1个箝位电容串联而成,该电路与各主功率管并联。主功率管的关断电压可自动被箝位电容电压箝位,从而将器件串联均压问题转化为各箝位电容电压均衡问题。提出了一种箝位电容均压方法,利用负向电流回收箝位电容电能,并能保证辅助开关管实现零电压开通。所提均压技术具有结构简单、损耗低、模块化等优点。此外,通过调整箝位电容放电时间差异,形成阶梯型桥臂电压,以减小桥臂电压的瞬时变化率dv/dt。搭建一台3 kV/750 V 30 kW谐振型直流变压器样机,每个桥臂采用6个SiC MOSFET串联。实验结果表明所提均压方法在各个工况下均能实现串联器件的动、静态均压,不均压度小于3%,且在3kV输入电压下峰值效率达98.4%。

波浪自适应救助艇收放连接装置设计

为有效缓解风浪对高海况下波浪自适应救助艇收放作业的影响,提升其安全性和稳定性,针对双体船波浪自适应救助艇特殊的船体结构,设计与其适配的连接装置,根据五级海况下的工作条件和收放要求对连接装置自身结构及与船体装配之后的整体结构进行强度校核,验证连接装置的强度满足设计要求和安装位置的合理性。通过搭建收放系统整体的动力学模型得到连接装置在收放过程中的动态强度,保证其能在五级海况下实现对波浪自适应救助艇的收放。

电力巡检失联无人机精确定位系统

由于电力无人机巡检作业工况复杂,受人员技能水平制约及外部环境干扰极易导致无人机发生坠毁、失联。特别是在福建山区发生坠机事件后,由于植被茂密,极大提高了失联无人机查找难度。为此,设计基于4G Cat1模块、全球导航卫星系统模块和超宽带模块的微型定位装置,开发上位机微信小程序,并提出一种基于超宽带与全球卫星定位系统融合定位算法。经现场测试表明该装置定位精度高,可有效提高无人机查找成功率,具有较高的推广应用价值。

联网医疗设备网络安全管理规范地方标准构建与实践路径

联网医疗设备的安全性是医疗质量的重要保证。针对联网医疗设备网络安全管理风险以及安全管理难点,苏州市卫生计生统计信息中心构建了基于联网医疗设备网络安全管理框架的地方标准,结合网络安全管理工作实践,指出应全方位落实网络安全监管机构、行业主管部门、联网医疗设备使用机构以及联网医疗设备厂商等多方职责,以确保医疗质量与患者安全。