多数据源关联分析评估天馈合理性的探讨

通常,对于天馈的优化往往是基于DT发现的异常事件,或者是针对用户投诉率较高的地区进行基站查勘,排查出天馈的故障以及合理性问题。文中列举了通过网管数据排查天馈故障以及通过多数据源的关联分析排查天馈合理性的新方法和新思路。     

密集市区深度覆盖研究及微基站的应用

通过对密集市区覆盖场景的细化和划分,并根据覆盖场景的特点分析微基站的适用性,提出了针对密集市区深度覆盖的思路和解决方案,最后,进一步探讨和验证了微基站工程应用的可行性及其覆盖效果,为密集市区深度覆盖提供一种有效的解决方案。     

喷气织机松边问题的解决方法

探讨喷气织机松边问题的解决办法.分析了产生松边的原因,主要有:边纱穿综方法、废边纱的设置、剪切时间、边撑位置、喷气压力、绞边纱张力、开口时间、综框高度等.通过在以上各方面采取措施,解决了松边问题,降低了纬向停台,提高了织机效率和产品的入库一等品率.     

ZAX-e型喷气织机减少停车档的工艺调试

为了提高ZAX-e型喷气织机生产产品的下机一等品率,对密路要调试回弹正转量、超启动功能、回转开始角、织口控制功能、经位置线、经纱张力,对稀纬调试回弹倒转量、超启动功能、运转开始角、经位置线等,对经缩调试织口控制功能、回弹倒转量、引纬启动功能、经位置线等.同时指出提高挡车工的操作水平、改正织为反织等也是减少停车档的有效方法.采取以上措施后,织机效率保持在90%以上,四分制下机一等品率达到80%以上,其中横档织疵减少了52.6%.     

用投影仪分析涤粘混纺纱的混纺比

对比分析了投影仪法、显微镜法和二组分法测试混纺纱混纺比的方法和特点 ,分析了纱线结构对涤粘混纺纱混纺比的影响。涤粘混纺纱混纺比的测试结果表明 ,投影仪法比显微镜法测试结果更为准确 ,弥补了显微镜法直接在显微镜中数根数的不足 ,并且适合小块布样的测试     

CJ40型精梳机的技术特性及应用

介绍CJ40型精梳机技术特性及使用情况。阐述了CJ40型精梳机的主要技术特点以及使用该精梳机生产CJ14.5tex纱的工艺配置、精梳及成纱质量水平。指出:该精梳机具有噪声低、优质高产、自动化程度高、运行稳定等特点,精梳条的质量可达到乌斯特2001公报5%～25%的水平。使用中应注意保持配棉稳定,合理配置小卷定量、速度和落棉率等工艺参数,选用性能良好的锡林及顶梳专件,并做好设备维修人员的专业培训工作。     

A PSO based Energy Efficient Coverage Control Algorithm for Wireless Sensor Networks

Wireless Sensor Networks (WSNs) are large-scale and high-density networks that typically have coverage area overlap. In addition, a random deployment of sensor nodes cannot fully guarantee coverage of the sensing area, which leads to coverage holes in WSNs. Thus, coverage control plays an important role in WSNs. To alleviate unnecessary energy wastage and improve network performance, we consider both energy efficiency and coverage rate for WSNs. In this paper, we present a novel coverage control algorithm based on Particle Swarm Optimization (PSO). Firstly, the sensor nodes are randomly deployed in a target area and remain static after deployment. Then, the whole network is partitioned into grids, and we calculate each grid’s coverage rate and energy consumption. Finally, each sensor nodes’ sensing radius is adjusted according to the coverage rate and energy consumption of each grid. Simulation results show that our algorithm can effectively improve coverage rate and reduce energy consumption     

A Multi-Objective Metaheuristics Study on Solving Constrained Relay Node Deployment Problem in WSNS

This paper studies how to deploy relay nodes into traditional wireless sensor networks with constraint aiming to simultaneously optimize two important factors; average energy consumption and average network reliability. We consider tackling this multi-objective (MO) optimization problem with three metaheuristics, which employ greatly different evolutional strategies, and aim at an in-depth analysis of different performances of these metaheuristics to our problem. For this purpose, a statistical procedure is employed to analyse the results for confidence, in consideration of two MO quality metrics; hypervolume and coverage of two sets. After comprehensive analysis of the results, it is concluded that NSGA-II provides the best performance.     

个人通信业务网的越区切换管理

在无线个人通信系统中,当便携台在通话期间从一个基站BS覆盖区移动到另一个BS覆盖区时,需要进行越区切换,以保证通话的连续性。文中主要讨论越区切换管理、越区切换检测、信道分配和无线链路转接等问题。     

Optimization of an office building form using a lattice incubate boxes method

With the increasing demand for sustainable built environments, energy performance is becoming essential in the early design stage. Several previous studies using optimization of building form for energy performance considered simple hypothetical forms. In addition, previous multi-objective optimization (MOO) of building form and envelope did not consider views percentage to the outdoor (VPO) despite of its importance for human mental health and its conflict with energy performance. This paper proposes a novel lattice incubates boxes (LIB) method that optimizes a cellular office building form. It considers the entire building with 27 thermal zones in an attempt to mimic a real case study. In addition, it considers VPO as an objective in the MOO of building form and envelope. First, the study performs single-objective optimization (SOO) of architectural form and orientation for annual thermal Energy Use Intensity (EUI) in Cairo, London, and Chicago. Second, it performs multidisciplinary MOO of Cairo’s form, window to wall ratio (WWR) and horizontal shading devices (HSD) for annual thermal EUI, annual Useful Daylight Illuminance (UDI-100–2000), and VPO. Third, it develops the LIB method to make it more applicable in professional practice through considering 72 individual thermal zones while adding more constraints. Compared to the initial forms, first part EUI savings were between 16.86% and 12.9 %. EUI, UDI, and VPO savings for Cairo in the second part were 20.16%, 11.5%, and 19.5 %. Scatterplots are developed for the second part that show rows motion has the highest positive impact on UDI and VPO, WWR has a positive impact on all objectives and HSD has high positive impact on EUI only. Savings in the third part are 11 % EUI, 8.77 % UDI, 2.86% Daylight Autonomy (DLA) and 7.8 % VPO. Scatterplots in the third part show that almost all proposed form dynamic parameters have strong impact on all objectives.