低压台区电表检查中电力载波OFDM技术应用

文章针对电表台区用户和相序识别需求,结合OFDM技术优势和信道测试分析,采用自适应控制、过零短帧发送等技术,研制了具有较高通信可靠性和适应能力的台区电表检查系统。该系统不仅可用于电表的台区识别,也可用于低压抄表、路灯载波通信等系统,具有较好的实用价值和推广价值。     

基于蓝牙技术的北斗终端通信模块设计

北斗导航系统是我国自主研发的卫星导航系统,具有精确授时、短信通信及快速定位的特点。针对北斗天线和射频信号处理模块体积较大等问题,本文提出了一种利用蓝牙模块与北斗模块通信的便携式终端。本系统以STM32F103RBT单片机为核心,在北斗射频信号处理模块和北斗信息处理模块之间加入蓝牙通信的模块,实现这两部分的无线互联,从而解决了北斗终端系统携带不便的问题。     

TD-SCDMA系统智能天线波束形成算法的研究

TD-SCDMA系统基站端的智能天线通过波束形成能够显著减小多址干扰,改善通信质量.提出了一种加入扩频序列的协方差矩阵求逆最小二乘恒模(SMI-LSCMA)波束形成算法,该算法在SMI-LSCMA基础上利用特定用户信号的扩频序列信息来锁定该用户接收信号,这样可以使权值向量更新算法更快收敛.经过仿真验证,该算法具有较好的...     

大型对数周期天线阵列伺服控制系统的设计与实现

为了对大型对数周期天线阵列进行伺服控制,实现天线阵列中单轴转台俯仰方向的运动控制,设计并实现了大型对数周期天线阵列伺服控制系统。系统的主控制单元通过CAN总线与天线阵列中各天线驱动控制单元通信。除主控制单元触摸屏外,PC上位机通过主控制单元配置扩展网络接口模块,可对天线阵列进行远程控制,无需专人值守;应急手持设备在主控制单元或CAN总线故障时,可单独控制天线阵列中任一天线运动。运行结果表明,本系统已在16个大型对数周期天线构成的阵列中使用,能单独控制某个天线、控制某几个(或所有)天线同时同向或异向转动,或通过角度设置使天线转动到确定的角度,位置精度达到0.1°,运行状态稳定良好,可靠性高。能够满足大型对数周期天线阵列的控制要求,可应用于大部分大型对数周期天线阵列,有较高的应用价值,能为大型天线阵列控制提供参考。     

集群系统单区多基站的实现方案

以往的集群通信系统是以单区单基站方式实现通信覆盖的，它通过尽可能增加基站天线架设高度，基站发信机采用大功率发射方式，配合移动台的单工大功率发射方式来实现大区制的通信覆盖要求的。但单区的覆盖方式的致命弱点就是无法避免通信盲区的出现，随着移动通信技术的不断发展，蜂窝系统的多区覆盖技术也不断被吸收到集群系统中。通过将集群技术和蜂窝技术的有机结合，既保持了集群系统的传统优势，又较好地解决了大区制覆盖盲区的问题。     

多类型仿真数据生成软件设计

针对被监测运动机械设备,由于其工作环境复杂使得工况影响因子多,实验模拟其往往难以实现。为实现实际工况中非线性和线性信号等众多类型叠加信号,本文采用模拟信号设计满足需求的软件系统,并根据实际需求通过通信组件实现其信号的外部调用,满足用户实验和测试需求。实验表明该系统能模拟不同情况下多型信号,可以用于满足实验和测试需求,缩短研发周期。     

电梯控制主板及其检测维护设备的设计

分析以CPU32微处理设备(MC68376)为核心的NGH型电梯控制主板测试系统的体现,在需求研究、测试系统的设备选型与软件编程等层面展开探究。该系统在实验室研发期间,就可以对控制主板的运行性能展开模拟现场条件的检测。上位机借助LABVIEW图形化信息编程,完成检测平台的良好客户接口与底层硬件通信。检测平台对多片主板展开检测,有效迎合了用户需求,检查与确定主板设备上出现的各种故障,减少研发开支。     

国际石油多用户勘探的作用与商务操作

多用户勘探是地球物理勘探公司(物探公司)在非专用性基础上向用户提供的勘探服务.作为国际石油勘探行业近年逐渐发展起来的一种投资经营方式,多用户勘探能够提高物探公司及行业的设备和队伍利用率,能够使物探公司规避油价风险并为其带来可观的投资回报率.同时,多用户勘探能够缩短石油勘探开发公司(油公司)的勘探开发周期,降低油公司的勘探风险和勘探成本.多用户勘探许可的获取与一般勘探服务项目不同.多用户勘探数据库的销售有定额销售协议和预先投资协议两种方式.多用户勘探投资项目的会计处理方式具有特殊性.中国石油集团东方地球物理勘探公司(BGP)已经开始尝试多用户勘探投资项目,并在拓宽融资渠道、改善投资管理程序等方面积极探索,以适应多用户勘探投资业务发展的需要.     

基于用户决策的资费套餐优化模型

如何合理的设计套餐是通信企业一项复杂而重要的任务,而如何合理的选择套餐更是广大用户一直关注的焦点。针对上述问题,本文以用户与通信企业均可实现利益最大化为原则,以用户终身价值为目标,采用了聚类分析法并借助LINGO的编程技术,得出了一种基于用户如何对资费套餐进行决策的优化模型。     

基于线性二次型的永磁同步电机最优滑模控制

永磁同步电机的伺服控制系统是一个典型的非线性、强耦合、多输入多输出的系统,负载扰动和参数摄动都会使系统不稳定。针对这一问题,提出了一种基于线性二次型最优的滑模控制设计方法。将滑模控制与最优控制二者的优点相结合,设计了最优滑模控制律,并分别搭建基于传统滑模控制的永磁同步电机速度控制器和基于线性二次型最优的滑模速度控制器的仿真模型,在相同的条件下进行仿真,观察系统在两种控制器下的抗干扰能力。结果表明,不论系统受到突加负载信号还是突减负载信号的干扰,最优滑模控制器都具有很好的抗干扰能力,有效地增强了系统的鲁棒性。所提出的方法提高了永磁同步电机控制系统的动静态性能,对深入研究永磁同步电机控制系统具有一定的参考价值。     

科学运用RATER指数 努力提升用户满意

企业的发展离不开用户满意。运用RATER指数较为全面地论证了企业和用户的合作关系。同时,对如何科学应用RATER指数,不断赢得用户满意进行了分析和探讨,对实现企业和用户健康发展,合作共赢具有一定的现实意义。     

Understanding users' performance evaluation of IT solutions

Traditionally, buying center research in business marketing has long focused on the role of various buying center members, including users, in influencing purchasing decisions. Recent studies have also established the important role users play in successfully implementing information technology (IT) initiatives of buying organizations and its influence on future relationships with sellers. Consequently, in order to ensure future business, marketers need users to evaluate their solutions favorably. This study attempts to understand the factors influencing user evaluation of performance of sellers' IT solutions. Based on an inter-disciplinary approach, a model of antecedent factors to explain user evaluation of suppliers IT solutions is proposed and tested. Results gleaned from a survey of 361 users of Internet-based technology in an automotive supply chain indicate that user attitudes toward technology, satisfaction with the new technology, users' overall understanding of supply chain management principles, and job-related consequences influence user evaluation of IT solutions.     

用户感知评估体系的设计与实现

传统的网络性能评估手段无法做到对于用户感知的准确评估,需要采用新的手段,准确地评估手机用户对于网络质量的感知情况,在此基础上进行综合分析,为市场营销提供支撑。"用户感知评估体系"软件是基于GSM网络中A接口信令采集数据,以信令关联技术和数据挖掘的分析方法为基础,设计并实现提升用户感知性能的评估软件。通过用户感知评估体系的设计与实现,从全新的视角分析手机用户和移动市场,从而为移动市场营销及业务推广提供全面支撑,以及针对重点客户群进行感知网络性能的网络优化。     

Information systems in fast cycle development: identifying user needs in integrated automotive component development

Product development literature strongly emphasizes the need for open communication between suppliers and Original Equipment Manufacturers (OEMs). There is a widespread expectation that computer-aided communication networks will enable organizational members to work more flexibly, to share knowledge and competencies, and to span functional and company boundaries. However, few studies merge the possibilities of new information technologies and the operational needs of specific groups of users, for example product development engineers. The research reported in this paper aims to fill that gap. Through in-depth case studies of two development projects involving one auto OEM, one of its systems suppliers (working directly with the OEM) and five medium-sized expert suppliers (working either directly with the OEM or through the systems supplier), we identify three groups of user needs that are not currently satisfied by existing information system solutions: improvement of coordination and communication; enhancement of the access to new technological information; and support for the development of an organizational memory. We then explore what kind of information systems might help satisfy the above-mentioned needs. Potential barriers to efficient implementation of information systems in terms of the motivation of people using the systems, the reliability of the information, and the willingness to render information more transparent are discussed. It is concluded that when implementing information systems to support operational development work, it is essential to ground the system specification in clearly identified user needs that reflect the double nature of product engineering, namely the continuous interplay between routines and cognitive processes.     

User toolkits for innovation

Manufacturers must accurately understand user needs in order to develop successful products-but the task is becoming steadily more difficult as user needs change more rapidly, and as firms increasingly seek to serve "markets of one." User toolkits for innovation allow manufacturers to actually abandon their attempts to understand user needs in detail in favor of transferring need-related aspects of product and service development to users along with an appropriate toolkit.
User toolkits for innovation are specific to given product or service type and to a specified production system. Within those general constraints, they give users real freedom to innovate, allowing them to develop their custom product via iterative trial-and-error. That is, users can create a preliminary design, simulate or prototype it, evaluate its functioning in their own use environment, and then iteratively improve it until satisfied. As the concept is evolving, toolkits guide the user to insure that the completed design can be produced on the intended production system without change.
Pioneering applications in areas ranging from the development of custom integrated circuits to the development of custom foods show that user toolkits for innovation can be much more effective than traditional, manufacturer-based development methods.     

Videotex for news and business data: Comparison of user response to two information retrieval applications

An empirical comparison of user response to two information services offered by a prototype videotex system indicated that the business (ie farm market data) service was rated as more efficient and that users browsed more in that service than in the consumer (ie news) service. Further, both efficiency ratings and amount of browsing were more strongly correlated with amount of service use, ratings of service value and ratings of dependence upon the service for the business service than for the consumer service. Browsing thus seems to be a utitarian surveillance behaviour rather than a communication play behaviour in this setting.     

Exploring the Contributions of Involving Ordinary Users in Ideation of Technology‐Based Services*

Lead users have long been acknowledged as important contributors to the market success of innovative products and services. The ability of lead users to be such effective innovators has been ascribed to a combination of adequate technological expertise and superior knowledge of the user domain so‐called use experience. Drawing on the apparent success of lead users in innovation, many companies are now attempting to involve other types of users, namely, ordinary users, for ideation at the fuzzy front end (FFE) of new product and service development. However, ordinary users do not usually possess the technological knowledge of lead users, and the existing literature provides little guidance on how to manage such user involvement or its expected contributions. The purpose of the present study is, therefore, to contribute to scholarly knowledge regarding the benefits and management of user involvement during the ideation phase of innovation in technology‐based services. More specifically, the study investigates the contribution made in this respect by “ordinary” users, as opposed to professional developers. The research questions that are addressed are as follows: (1) What contributions do ordinary users make when involved in the FFE for ideation of new technology‐based services; and (2) how is the contribution of the users affected by their knowledge of the underlying technology? The study addresses these questions through a literature review and conceptual analysis of the involvement of users in innovation in mobile telephony, followed by an empirical study using a quasi‐experimental design in which the independent variable is the users' technological knowledge of the underlying mobile telephone system and the dependent variable is the quality of the created idea‐proposals from an innovation perspective. Various scenarios involving guided users, pioneering users, and professionals are investigated. The study finds that the users' knowledge of the underlying technology has an effect on their propensity to contribute with incremental or radical new ideas. The ideas from guided users tend to be more incremental whereas the pioneering users' ideas are more radical. Contrary to the users in the guided user scenarios, the users in the pioneering user scenarios have a propensity to produce ideas that challenge the prevailing dominant logic of the company; these ideas can be used to assist the company to think in new trajectories. The paper proposes that ordinary users should not be expected to contribute ideas that can be directly put into the new product development process; rather, ordinary user involvement should be regarded as a process whereby a company learns about users' needs and is inspired to innovate. The paper concludes that user involvement can actually be a stimulus for review of a company's business strategy.     

The commercialization of user innovations: the development of the rodeo kayak industry

In this study, we analyze the commercialization process of user innovations in open communities. We have traced 16 cases of user innovators who have commercialized their own innovations or have been involved in the commercialization process to some extent. By developing and manufacturing new products, the user innovators in our sample created a fast-growing community. They used low-cost manufacturing techniques and were able to start a new industry before established manufacturers could enter the market. The transformation process from a user innovation community to a commercial and manufacturing community brought about a number of major changes. In this paper, we track those changes as: the motives for innovating, the community size and characteristics, the type of innovation, the type of assistance and the disclosure of information, the form of communication, and competition between innovating users.     

User participation and management information system use: A path analysis

This article proposes and empirically tests a causal model of user participation and management information system use. Based on a review of available literature, three variables including user understanding, system quality and user acceptance are identified as intervening in the relationship between user participation and system use. Causal orders among these variables are assumed and a causal model is constructed for empirical testing. Task complexity is introduced as a contingent variable affecting the structure of these causal relationships. The data are collected from 134 users of 77 different information systems in 32 Korean business firms. The results of data analysis support the causal model in general, but suggest that causal relationships among the variables are different according to task complexity. Two separate models of user participation and management information system use, based on the empirical results, are presented for further research, one for more complex and the other for less complex systems.     

PERSPECTIVE: How Honda Innovates*

This article describes how Honda leverages its engine and other key subsystem technologies into new products uniquely designed for new target users and their new special uses. In this profile of the development of the Honda Element sports utility vehicle, we see how firm can identify new target applications, dive deeply into user research, and translate its acquired insights into specific designs and features. The feasibility and profitability of the effort is maximized by leveraging robust, fully operational platforms within new product lines.