基于MDT重叠覆盖度数据的KNN-DBSCAN参数自适应调优研究

传统网络优化中路测工作存在难以全量测试道路及楼宇、测试工作量大、工作效率低、周期长、受人为因素影响等显性缺点,无法动态关注每个区域网络质量情况,且常规测量报告(measurement report,MR)数据不具备定位信息,无法精确定位如重叠覆盖度问题发生位置。基于最小化路测(minimization drive test,MDT)精准定位系统通过采集底层基站MDT数据,并根据重叠覆盖度算法输出高重叠覆盖度栅格,再通过自适应K最近邻-具有噪声的基于密度的聚类方法(K-nearest neighbor density-based spatial clustering of applica-tions with noise,KNN-DBSCAN)联合算法解决了DBSCAN算法对参数设置敏感性问题,并对问题栅格进行非监督聚类,收敛问题连片区域,通过小区采样贡献度进行栅格区域映射,最终达到精准调整全局最高优先级(TOP)小区,降低小区高重叠覆盖度的目的。     

基于用户感知的IPTV质量评估研究及应用

提供基于用户感知的IPTV质量端到端自动化评估方法和系统,将用户侧感知数据、用户承载网络运行数据以及远端视频服务平台数据等整合到同一个大数据分析系统,通过大数据分析手段建立用户端到端感知模型及评价体系,实现用户端管云业务感知监测,自动获取用户在使用IPTV过程中的感知度,并实现用户感知度端管云的量化评估。通过端管云业务感知评估结果,有针对性地解决影响用户感知的问题和环节,以改善服务的不足。     

市场背景下考虑不确定性价值和全市场要素博弈的 电力系统规划方法

电力市场化改革的深化为电力系统规划领域引入了新的问题。为应对这一变化,提出了一种市场背景下考虑规划不确定性价值和全市场要素博弈的电力系统规划方法。首先,在分析电力市场各参与者的整体利益诉求的基础上引入特殊主体独立系统运营商(Independent System Operator, ISO),并从市场运营角度构建输电公司规划模型。然后,在RO(Real Option)理论的基础上,以发电机组选址定容、输电线路扩容和分布式电源(Distributed Generation, DG)投运为决策变量,并同时分析各市场参与者之间的博弈交互机理,构建基于RO理论的多主体博弈规划模型。基于IEEE30系统的仿真算例验证了所提方法的有效性和正确性。     

Green and ecological interior design based on network processor and embedded system

With the growing demand for interior design solutions that are friendly to the green environment, there is a growing awareness of interior designers around the world to the sustainability strategy. Most of the traditional interior design and construction process consumes many natural resources in the manufacturing and installation process. This will harm the environment. Interior designers adopted a sustainable design technology, the opportunity to improve the healthy indoor air quality. To achieve sustainable solutions, materials, construction methods, furniture by selecting the lighting design options. Despite much sustainable design research, discussion of the interior design of sustainability criteria there little. Essential for sustainable standard interior design solutions to support the responsible interior designer. Therefore, this study aims to propose a set of criteria for selecting based on sustainable indoor network processors and embedded system design solutions to ensure a sustainable and consistent product mix of 3DWeb representation of interior design solutions thing. Finally, to enhance its functionality, come to an end because of the importance of effective standards.     

滇中引水工程凤凰山隧洞过活动断裂带结构适应性研究

滇中引水工程输水建筑物多采用隧洞,占比高达92%,线路多次穿越区域性活动断裂带等地质条件复杂的地层,工程建设及安全运行均受到严重威胁。结合滇中引水工程隧洞穿越活动断裂带的工程设计案例,从建筑物结构型式选择以及结构对断裂带蠕滑变形及黏滑变形的适应性进行了三维仿真分析,并提出了工程运行期合理的检修年限。研究结果表明:采用短衬砌和宽变形缝结构形式可有效减小区域性活动断裂带位移产生的结构应力,大大延长了衬砌结构的使用寿命。研究结论为穿越活断裂隧洞的抗错断设计提供参考。     

Characterization of α-Al2O3–(Al–Si)3Ti composites

The reactions that take place during the formation of ceramic matrix composites that are based on α-Al₂O₃–(Al–Si)₃Ti interpenetrating networks were analysed. A reactive preform was pressure infiltrated with an Al–Si alloy. After pressure infiltration, the composite did not react in a full manner and further thermal annealing was required. The reduction of TiO₂ by the liquid Al–Si alloy results in the formation of (Al-Si)₃Ti (Al₆₀Si₁₂Ti₂₈). The formation of (Al–Si)₃Ti is governed by the consumption of TiO that is formed as an intermediate phase during the reduction of TiO₂.     

A DPS-based system modelling method for 3D-structures simulation in manufacturing processes

In the field of engineering, guidelines and computerisation are important to facilitate the resolution of complex problems. Engineers apply computer techniques of distributed problem solving (DPS) to design and simulation tasks, such as in industrial manufacture (e.g., simulation of aircraft, modelling of structures and mass customization). An important application of these and other computer-aided techniques is the design and manufacture of industrial greenhouses in south-eastern Spain. The importance of greenhouses in this region led to the establishment of European Standard UNE-EN 13031-1 for the design and construction of structures for commercial production. Computer-assisted techniques are helping to put this European Manufacturing Standard into effect. This article discusses how DPS techniques help to solve problems in industrial manufacturing processes, and presents the case of modelling and simulation of 3D-structures used in greenhouse construction.     

Recovery of copper cyanide from waste cyanide solution by LIX 7950

The use of the guanidine extractant, LIX 7950, to extract copper cyanide from waste cyanide solution has been investigated. Copper extraction is favorable at low pH while a high cyanide to copper molar ratio tends to suppress copper loading. The extractant also strongly extracted zinc and nickel from cyanide solution, but the extraction of iron was poor. The presence of thiocyanate ion significantly depressed copper extraction, but thiosulfate ion produced negligible impact on copper extraction. The preferential extraction of metal cyanide species to free cyanide has been noticed. The potential application of the recovery technique as a pre-concentration step for the treatment of cyanide effluent has been suggested, by which copper can be extracted and concentrated into a small volume of solution and the barren cyanide solution recycled to the cyanidation process.     

700MHz频段5G网络广播电视系统干扰问题研究

在700 MHz频段5G网络运营中存在广播电视系统的同频干扰风险，严重影响网络性能。从广播电视系统的频率配置出发，首先，探讨了700 MHz频段5G网络受广播电视系统干扰的原理；然后，分析广播电视系统干扰特点，并针对这些特点提出了基于频域信息的广播电视系统干扰识别算法；最后，对算法识别的准确性进行测试验证，实现通过干扰识别支撑干扰优化、规避的目标。     

银电解液中钯的定向分离试验研究

针对现阶段银电解工艺的电解液净化方式中存在的不足, 结合丁二酮肟对钯的良好选择分离性, 对银电解液中的钯开展了吸附分离研究, 验证了丁二酮肟分离银电解液中钯的可行性。开展了60 ℃、反应时间30 min下, 不同酸度补加量、丁二酮肟加入量的条件试验, 确定了最优工艺控制参数为:硝酸补加量60 mL/L、丁二酮肟加入量为理论量的2倍, 在该工艺条件下, 钯的分离率可以达到83%, 铂、铋分离率分别为18.75%和6.3%, 铜、银无分离。分离后沉淀渣含钯30%、含铂0.57%, 可以直接用于后续的铂钯精炼提纯。