System for assisted mobility using eye movements based on electrooculography

Describes an eye-control method based on electrooculography (EOG) to develop a system for assisted mobility. One of its most important features is its modularity, making it adaptable to the particular needs of each user according to the type and degree of handicap involved. An eye model based on electrooculographic signal is proposed and its validity is studied. Several human-machine interfaces (HMI) based on EOG are commented, focusing our study on guiding and controlling a wheelchair for disabled people, where the control is actually effected by eye movements within the socket. Different techniques and guidance strategies are then shown with comments on the advantages and disadvantages of each one. The system consists of a standard electric wheelchair with an on-board computer, sensors and a graphic user interface run by the computer. On the other hand, this eye-control method can be applied to handle graphical interfaces, where the eye is used as a mouse computer. Results obtained show that this control technique could be useful in multiple applications, such as mobility and communication aid for handicapped persons.     

基于非侵入式负荷监测的用户行为精细化分析

随着非侵入式电力负荷监测的发展,如何利用用户负荷用电细节信息,分析用户用电行为特征成为重要的研究方向。本文提出了基于非侵入式负荷监测的用户行为精细化分析方法,根据历史数据建立用户行为特性指标,提出基于因子分析与支持向量机的用户聚类方法。在此基础上,建立基于精细化负荷数据的用户需求响应潜力评估指标。算例结果表明,所研究内容可以准确分析用户行为,为电力公司施行需求侧管理提供科学指导。     

基于GSM的粮仓温湿度远程监测装置设计

针对粮仓监测技术的需求,提出一种基于GSM的粮仓温湿度远程监测装置设计.该装置的主要特点为当粮仓的温湿度超出正常范围时,该装置会通过GSM网络向指定用户的手机发送报警短信,用户也可以通过手机短信随时查询粮仓的温湿度状况.详细介绍了该装置的硬件和单片机程序的设计方法,并对设计的装置进行了测试.测试结果表明,设计的装置能实现粮仓温湿度远程和本地监测报警等各种功能,运行效果良好.     

基于AE-MFCM技术的电力用户响应特性分析方法

对电力用户用电特性的正确分析是实现电力系统高效运行和增值服务的关键.本文提出一种基于自动编码器与改进模糊C均值聚类算法结合技术的用户响应特征分析方法.首先,对用电模式进行聚类来确定用户的行为特性,利用自动编码器和改进模糊C均值聚类算法实现特征提取和数据处理.然后,基于用户用电模式的分类结果,利用神经网络等智能算法对每类...     

一种基于时间序列数据挖掘的用户负荷曲线分析方法

针对目前用户负荷曲线分析方法研究中传统方法在单一用户典型负荷曲线提取以及负荷曲线特征提取的不足,提出了一种基于时间序列数据挖掘的用户负荷曲线分析方法。该方法首先基于分段聚合近似方法对单一用户的负荷曲线降维,并基于符号聚合近似方法对该用户一段时期内的负荷曲线重表达,用符号化序列表示该用户的负荷曲线,提取该用户的典型负荷曲线。然后结合不同用户典型负荷曲线的负荷特性、指标特征和时间序列特征,基于k-means算法对不同用户的典型负荷曲线聚类分析,分析不同类型用户的用电特征。以UCI一个测试数据集进行算例分析,结果表明所提方法能够挖掘出用户的典型用电行为特征,并提升用户负荷曲线分析效率与聚类质量。     

考虑装置属性与用户特性的电压暂降抑制装置偏好

电压暂降抑制装置偏好为用户优质供电投资决策提供了基础。针对目前抑制装置治理效果评估时考虑因素单一的不足,采用效用理论描述抑制装置属性（equipment attribute,EA）,同时,将电压暂降严重程度、暂降引起的负荷损失以及经济损失风险作为用户特性（user characteristics,UC）,全面地描述了用户需求。最后利用巢式Logit模型分析了装置属性和用户特性对抑制装置偏好的影响。算例表明,所提方法能有效预测用户治理装置选择,反映了不同用户特性对选择抑制装置选择的影响。所提方法能够定量分析用户偏好,对优质供电投资决策具有指导意义。     

Visual search controlled by spatial frequency without salient features in an image

To clarify the characteristics of visual search that are controlled by spatial frequency, we measured the scan path during eye movement in response to visual stimuli. A target stimulus with the spatial frequency of 1/f^β (where β is the slope of power spectral density of luminance in an image) was embedded in a background stimulus with white (1/f⁰) characteristics. An instruction‐based task was employed in this study, wherein a subject searches for the target as rapidly as possible and fixates on it. Participants were six healthy males aged 21–22 years. In the task, a threshold for spatial frequency that was the minimum value required by the subjects for the search corresponded to β =∼ 0.2 − 0.3. This finding has potential application in the design of visual presentation media, such as signs and tablets, by providing ease of viewing to the user. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Cataracts and personal communication radiation

The induction of cataracts or formation of lens opacity in the human eye has often been incriminated as a possible hazard of human exposure to personal communication radiation and microwave radiation in general. In the case of cell phones, some concerns have been expressed when the user holds the cell-phone handset, or the microwave radiating device, directly in front of the face, exposing the eye to a straight-on incidence of the cell-phone radiation.     

用数字签名解决电力系统敏感文档签名问题

目前电力系统中普遍采用MIS实现办公自动化，完成文档的生成、确认、签发、传递、存档等工作。当前的MIS都是采用简单的用户名/口令机制实现对用户的身份认证，不能提供实质上的安全签名服务。采用基于公钥密码算法的数字签名可以充当个人在网络空间“身份证”的角色，能够很好地解决目前MIS存在的敏感文档签名问题。文中介绍了密码算法的基本原理，给出了数字签名的解决方案。     

考虑不同敏感设备耐受特性的用户侧电压暂降严重程度区间评估方法

电压暂降严重程度指标是定量评估节点暂降水平的基础.针对现有评估方法未考虑敏感设备耐受能力不确定性与差异性的问题,提出了一种改进的用户侧电压暂降严重程度区间评估方法.首先,阐述了现有评估方法无法反映不同敏感设备耐受能力不确定性的问题.为刻画耐受能力的不确定性,基于典型敏感设备的不确定区域,采用区间数理论对严重程度指标计算...     

基于驾驶员眼动特征的无极调光智能控制技术的安全性

为研究采用无极调光智能控制技术对驾驶员行车安全性的影响,选取周公山隧道进行基于驾驶员眼动特征的试验。采用眼动仪记录驾驶员的眼动数据,对注视持续时间、扫视平均速度、瞳孔直径等参数进行统计分析。试验结果表明,驾驶员在使用无极调光智能控制技术的隧道照明环境中行驶时,眼动特征参数与未使用此技术无明显差异,表明驾驶员通过采用此技术的隧道照明环境时,心理舒适程度、紧张程度与未采用此技术的隧道无明显变化,满足了隧道行车安全性、节能性、舒适性的要求。     

An optimized collaborative filtering method to construct spatial‐temporal behavior pattern‐based user interest model

Mobile social network (MSN ) has properties of real time, mobility, and social relationship, and provides more real‐time, more dimensional, and more heterogeneous metadata. The traditional user interest models represent mobile users' interests unsatisfactorily because of these inherent characteristics. This paper aims to combine the characteristics of mobile social networks appropriately to build a user interest model effectively for representing user interests. The constructed model is supposed to enable users to filter uninterested information, to provide personalized mobile service, to solve information overload, and to gain a good user experience. In order to realize these, first, we explore various issues of the traditional user interest model, and analyze the numerous problems in using traditional models to represent mobile user interests. Then a user spatial‐temporal behavior pattern in conjunction with mobile personalization attributes and context information is proposed, which is followed by a proposal of a user interest model to represent user interests. Second, we introduce a hybrid collaborative filtering method based on users and subjects to calculate user interests and to build the user interest model, considering the user interest extensive degree, the subject popularity, as well as the user influence. Finally, a model construction algorithm is proposed based on the user's spatial‐temporal behavior pattern. Experimental results show that the proposed model can represent user interests effectively under the mobile social network. Furthermore, it is verified that the adaptability and accuracy of the construction algorithm are significantly improved by considering the user interest extensive degree, the subject popularity, and the user influence. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

A microprogramming animation

This paper describes a successful project using computer animation to teach the concepts of microprogramming to lower division computer science majors. The students write a simulator for the Mic-1 horizontal microcontroller described in the book Structured Computer Organization by Tanenbaum. The simulation is enhanced by the use of a graphical representation of the machine to animate the simulation. This creative use of computer animation enables the students to see the results of their simulation without having to write an extensive user interface. They can concentrate on implementing the instruction cycle, an activity that directly enhances their understanding of microprogramming and the conventional machine level. The XTango animation package is used, making the animation facility portable to any Unix system with an X display. The user interface and additional instructional material are available via the web     

基于PLC的小型高精度多相流实验装置测控系统设计

设计了1套小型高精度油气水三相流实验装置,重点讨论该装置的测控系统设计及实现。通过比较可编程控制器(programmable logic controller,PLC)以及单片机测控系统的特性,选择PLC为基础构件测控系统硬件,分析了输入输出设备的数量和性质,根据系统的I/O点数和估算的内存字数的要求,选择了西门子S7-224XP CPU,其程序存储器和数据存储器较大,内置集成了2AI/1AO,2个RS485通信端口,设计了数据采集及PID闭环流量控制等功能,可以实现油气水三相流实验室装置的自动控制,用户在由VB编写的上位机上输入理想的流量值,经过PLC程序运算经模拟量模块输出来控制电动调节阀的开度至达到理想流量。     

Applying virtual reality

Virtual reality (VR) immerses a user within a simulated three-dimensional environment. Still in its infancy, much remains to be done, but the field shows great promise. Computer processing speed, graphics, networks, and specialized peripherals all play a part in creating believable applications. In a full VR implementation, the user wears specialized goggles that substitute small video displays for the lenses, one for each eye. The displays become the “lenses” onto a simulated world. The head-mounted display containing the goggles detects head movement and updates the user's view accordingly; the user has the impression of looking around, even moving within, the simulated environment. The sensory experience can be further enriched with sound, or a data glove to simulate contact between the user and simulated objects. In a partial VR implementation, a computer's video display becomes a window onto the simulated environment, and no external gear is required. In a networked environment, people can be immersed in the same simulation, each perceiving it from their own point of view     

基于GPRS配变远程监控报警管理信息系统设计

提出了在基于GPRS的SCADA系统中应用于监控中心的信息管理系统设计,达到效果为一方面通过GPRS网络与现场参数监测装置进行双向通信,另一方面为用户提供一个可视化界面,使用户足不出户即可了解远方变压器实时的运行状况.     

智能电网用户端环境下短期负荷预测方法的研究

智能电网用户端环境下的用电模式有其自身的特点。结合该特点对成熟的神经元网络负荷预测方法进行改进,着重优化预测的输入部分,形成一套适合智能电网用户端环境下短期负荷预测方法。算例结果表明,该方案有助于预测准确率的提高。     

考虑需求响应用户参与度的主动配电网优化调度

随着主动配电网中分布式能源的大量接入,需求响应这一灵活可调度资源的价值越来越受到重视。基于价格型和激励型需求响应的响应特性,考虑需求响应的用户参与度,计及购电成本、网损成本、发电成本、储能成本以及需求响应成本,建立了以配电网日运行成本最小为目标函数的主动配电网调度模型。通过改进的粒子群算法对模型求解。修改后的IEEE33节点配电系统算例验证了所提模型的有效性,证明了提高需求响应用户参与度在改善系统运行特性上的有利作用。     

基于Zigbee与GSM的智能测量与报警系统

主要介绍一种基于Zigbee与GSM的智能测量与报警系统。Zigbee的Coordinator与STM32处理器相连,end devices和router负责采集数据。STM32会对接收到的数据进行分析,将数据实时显示到TFT上,并绘制近期数据的曲线图。系统引入了WSN里面的一种智能算法,用于侦测异常行为,并通过GSM及时发送给用户。用户还可以通过查看SD卡里面存储信息来分析采集到的数据。     

A Communication Systems Simulation Laboratory

Taking advantage of techniques developed in the field of Computer Science, a laboratory based on a minicomputer system has been generated for the general purpose simulation of analog and digital communication systems. Using a graphics terminal, a student user may specify the characteristics of his desired system and then dynamically examine time and frequency domain displays as the information-bearing signal propagates through his system. The system user describes his system initially in terms of an Information Flow graph which identifies all system nodes, their interconnections, and characteristics. This graph is then represented in the simulation as a chained User Program. The execution of that User Program simulates the communication system. Emphasis in this system is placed on the ability to model physical processes and the use of graphical displays to relate the model to the process itself. In addition, the characteristics of a minicomputer facility to duplicate the simulation system discussed here are presented.