微波接力机无线分布式监测系统的研究与开发

本文论述了WJ100微波接力机远程分布式无线监测系统的研究与开发,该系统具有性价比高、受地理条件限制少、易于扩展、易于维护和操作、实时数据采集、实时声音动画报警、数据远距离无线传输等特点,该系统所使用的通信技术特别适用于在高山丛林、沼泽、沙漠等地区建立无人职守监测网络,具有很大的推广价值.     

微波接力机无线分布式监测系统的研究与开发

本文论述了WJ100微波接力机远程分布式无线监测系统的研究与开发，该系统具有性价比高、受地理条件限制少、易于扩展、易于维护和操作、实时数据采集、实时声音动画报警、数据远距离无线传输等特点，该系统所使用的通信技术特别适用于在高山丛林、沼泽、沙漠等地区建立无人职守监测网络，具有很大的推广价值。     

半双工远距离数据通讯数据采集系统

随着科学技术与经济的发展,许多数据采集系统需要远程控制采集,作为远程通讯系统,通讯线路很重要,本文介绍一种远程多机通讯数据采集系统。可利用现有电话线等直连线路改造,可以节约铺设线路费用。     

分布式光伏电站电能信息实时采集实现方法

本文研究了分布式光伏电站电能信息实时采集实现方法,提出了采用电力调度数据网和GPRS无线通讯网两种组网方式将分布式光伏电站电能信息接入调度电量系统。解决了分布式光伏电站地理位置分散,组网困难的问题,相关技术在实际生产中的推进应用,将提高供电公司对分布式光伏电站电能信息管理的效率,进一步提升供电企业的社会形象。文章对电能信息接入要求、通讯组网方式、二次安全防护架构设计做了详细的阐述。     

新建建筑预留光伏电站设计分析

现如今,利用已有厂房屋面建设分布式光伏电站已成为一种普遍模式。近十年来,全球光伏发电产业每年以40%～50%的速度在持续增长,称得上是世界上发展最快的新型产业。然而,在设计电站时总会存在各种各样的问题,象屋面受到阴影遮挡,厂房结构无法满足光伏荷载要求,厂区内无合适放置电气设备的空间等,因此实际上可能并不适合安装光伏电站。因此,如果能在建设厂房之前规避掉可能会出现的问题,那将会缩短建设周期,大大降低光伏电站的投资成本。     

结合环境变量的分布式光伏电站效率评估方法

目的:全面的光伏系统评价体系可以有效分析分布式光伏电站的效率问题,对提升电站利用率具有重要意义。方法:结合环境影响,提出了一种基于改进三阶段DEA的分布式光伏电站效率评价方法,通过投入导向模型计算每座光伏电站的综合技术效率、纯技术效率和规模效率,利用LASSO回归选取影响效率分析的环境变量,并对变量数据进行标准化处理,采用随机前沿模型剔除环境变量和随机噪声来调整投入指标,同时加入限制因子以防止调整过大,通过投入指标调整前后的三种效率对比来计算每座电站的真实效率。结果:算例结果表明,环境变量对电站的效率评判产生较大影响。结论:大部分光伏电站的综合技术效率和纯技术效率在剔除环境变量和随机噪声前被高估。     

基于支持向量机的光伏电站异常数据序列提取

根据华为生产管理系统提供的光伏阵列直流端数据,研究电气数据序列的异常特征,提出一种基于支持向量机的异常数据序列提取方法,实现组串异常判定。通过分析异常数据序列波形特征,总结其波形变化规律;对数据序列进行偏差率及马氏距离计算,设定健康阈值,实现正常、异常标记,建立训练样本集以训练支持向量机模型,利用网格搜索与交叉验证法确定模型最优参数。将该模型对电站进行异常数据序列提取,常规/非常规类异常状态判定。结果表明,所构建的模型对电流、电压数据序列进行分类时的误判率分别为3.19%、2.03%,漏判率分别为2.35%、2.16%,该模型具有较高的可靠性。     

PDM中分布式明细表管理的实现

 产品数据管理主要用于帮助工程人员管理信息、处理技术图形、设计模型和控制工作流程，是企业的数据管理和流程管理中心．采用Oracle数据库，提出了分布式明细表管理的技术，对所有有关产品的数据进行动态管理，满足了分布在不同地区的大型企业的需要。     

浅谈远程无线视频监控终端设计

远程无线视频监控不受限制,可以摆脱线缆的束缚,具有安装周期短、维护方便、扩容能力强等优点,适用于那些既有数据处理又有大量事务需要处理的场合。本文对一种基于3G的无线视频监控系统设计进行了分析。     

我国中东部地区分布式光伏电站项目投资分析

近年来,在国家及省地市政策刺激下,我国光伏电站建设如火如荼。2012年10月,国家能源局发布《支持分布式光伏发电站建设及光伏发电并网的有关意见》,推动我国中东部地区的光伏电站建设,我国光伏电站产业规模又将进一步得到提升。2013年1月29日,国家能源局新能源和可再生能源司副司长史立山透露《,太阳能发电发展"十二五"规划》将我国2015年度总装机容量目标调整到35GWp。根据国家能源局统计数     

Design of collaboration framework for distributed CIM data activities

Together with the development of computer network technology, the automatic collaboration of CIM data activities is becoming an important research issue. Two models are proposed for the research issue: a data activity flow network model called DAF-Net for coordinating interdependent data activities and an agent-based integration model of information systems called AIMIS for integrating distributed and heterogeneous information systems on demand. Additionally, this paper addresses the key design factors of the DAF-Net and also the AIMIS: the structural type of the DAF-Net and the agent interaction protocol of the AIMIS. Statistical methods and PVM (Parallel Virtual Machine) software are employed for the design of the DAF-Net and the AIMIS.     

Design of distributed layouts

Distributed layouts are layouts where multiple copies of the same department type may exist and may be placed in non-adjoining locations. In this paper, we present a procedure for the design of distributed layouts in settings with multiple periods where product demand and product mix may vary from period to period and where a relayout may be undertaken at the beginning of each period. Our objective is to design layouts for each period that balance relayout costs between periods with material flow efficiency in each period. We present a multi-period model for jointly determining layout and flow allocation and offer exact and heuristic solution procedures. We use our solution procedures to examine the value of distributed layouts for varying assumptions about system parameters and to draw several managerial insights. In particular, we show that distributed layouts are most valuable when demand variability is high or product variety is low. We also show that department duplication (e.g., through the disaggregation of existing functional departments) exhibits strong diminishing returns, with most of the benefits of a fully distributed layout realized with relatively few duplicates of each department type.     

火电厂智能化远程管理云平台系统设计

为优化火力发电的生产,解决传统服务器在存储和挖掘大数据能力上的不足,该文采用云存储和云计算技术,将爆发式增长的火电机组生产数据存储在云端,通过对云端数据库的访问,搭建在线的火电厂远程管理平台,对生产数据进行远程监督和规范化存储。智能化云平台系统通过果蝇算法优化的广义回归神经网络(FOA-GRNN),设计一种锅炉热效率实时软测量模型。通过实验验证,云平台相比于传统服务器,在保证预测精度的前提下,有着更加高效的数据处理能力。     

EDPF-NT分散控制系统在空分装置上的应用

阐述了EDPF NT分散控制系统的组成和主要技术性能 ,其特点是具有高可靠性、高通讯速率、高精度 ,良好的可维护性、适应性、可扩展性。介绍了在 5 40 0m3 /h空分装置上的应用及为稳定空分工况在控制方式上进行的几点卓有成效的改进。     

Organizing distributed data bases for parallel searching

Abstract

This paper is mainly concerned with the problem of distributing a data base (i.e., a set of segments) in a computer network system so as to facilitate parallel searching. In our distributed data base model, we assume that all segments are stored in nodes. Each time a query occurs, all nodes are searched concurrently. For convenience, we define the time required to access a segment from any node as a time unit. For a network with d nodes, the response time of a query is then identical to the maximum (n ₁ , n ₂, …, n_d ), where n_i , is the number of segments that satisfies the query and is stored in node i. Unfortunately, the solution for finding an optimal way to organize a distributed data base for parallel searching is still at large. In other words, given a data base, there is no efficient polynomial time algorithm for finding an optimal arrangement of segments onto nodes. In this article, we shall present a “heuristic algorithm” based upon a multivariant analysis method in statistics to distribute a data base in a network system. Some experimental results will show that our method is indeed feasible and effective.     

Approximations of tolerance intervals for normally distributed data

Tolerance intervals are lesser known relatives of confidence and prediction intervals. They can be very useful in many situations to make product or process quality assessments. Even for normally distributed data, their calculation is less trivial than confidence and prediction intervals, which makes them underutilized in practice. In addition, they are not always readily available in statistical software packages. As a result, there have been several approximate methods proposed in the literature to calculate them. After a review of tolerance intervals and their variations, we investigate those approximations and compare them with the exact values for one‐sided and two‐sided intervals. We first propose a modification of an approximation for a one‐sided interval. Then we propose new approximations for two‐sided intervals based on Bonferroni's Inequality. We find that these approximations are extremely satisfactory for practical applications. Copyright © 2008 John Wiley & Sons, Ltd.     

UL-PML: constraint-enabled distributed product data model

The global economy has made manufacturing industry more distributed than ever before. Product design requires more involvement from various technical disciplines at different locations. In such a geographically and temporally distributed environment, efficient and effective collaboration on design is vital to maintain product quality and organizational competency. Current standard computer-aided design data formats do not support design collaboration effectively in terms of design information and knowledge capturing, exchange, and integration. Design constraints cannot be represented and transferred among different groups, and design information cannot be integrated efficiently within a distributed environment. A new design data model, the Universal Linkage model, is developed here to represent design-related information for network-based collaborative design. It incorporates geometric and non-geometric constraints with traditional geometric elements, thus allowing more design knowledge sharing in collaborative design. Segments of design information can be linked and integrated into a set of complete product data. Thus, lean information exchange can be realized. This model, which has good properties of openness and extensibility, is represented by Directed Hyper Graph and Product Markup Language.     

Analysis and evaluation of distributed photovoltaic generation in electrical energy production and related regulations of Turkey

Clean Technologies and Environmental Policy - Turkey is a developing country with rising energy demands. Energy access is one of the key parameters to sustain the development, since the country...     

国家千克副基准自动测量与数据管理的设计与实现

为准确测量千克副基准的各项参数,提出采用自动化测量并建立数据库管理系统的方法。该文对系统的总体方案进行设计,分析砝码质量、砝码磁化率、砝码磁化强度、空气密度、砝码密度和体积的检测原理、算法流程及软件实现,设计数据库管理系统。该方法可完善和提升国家千克副基准的测量系统,提高工作效率及测量的准确度,保证量值传递的准确性及稳定性。     

风光储制氢下多台制氢机组优化调度研究

以风光储制氢系统中多台制氢机组和储能电池的优化调度为研究对象,目标是制氢的经济效益最大化.根据调度对象和目标函数的特征分别采用改进时序差分算法(TDA)和多目标粒子群优化算法(MOPSO)进行优化调度,其中储能电池的调度起辅助作用,用来使风光出力曲线匹配制氢出力曲线.算例分析表明,文中所述改进时序差分算法在解决多台制氢...