基于BERT-BILSTM-CRF模型的电力行业事故文本智能分析*

为解决电力行业事故报告文本较长、语义复杂,难以进行有效文本识别问题,提出1种以BERT作为底层的预训练模型,并设计1种双重注意力机制编码器,结合BILSTM-CRF深度挖掘事故文本语义特征,从而实现文本智能分析。首先构建电力词典,通过对BERT预训练,进行BIO标注,然后引入BILSTM-CRF模型实现对文本标签智能分类,最后将该模型与现行其他4种深度学习模型进行对比。研究结果表明:该模型智能识别精确率、召回率及F1值(查准率)均达到约97%,较其他4种模型中效果最好的模型分别提高0.02,0.03,0.02。研究结果可为电力行业事故报告文本分析提供1种新思路。     

基于BERT的灾害三元组信息抽取优化研究

为从网络媒体文本中快速、准确提取灾害三元组信息,利用自然语言处理(NLP)技术,研究灾害三元组信息抽取应用及其算法优化。通过双向编码器表示(BERT)预训练语言模型,应用于地质灾害三元组信息提取的实例中,针对模型由于底层多头注意力(MHA)机制会导致“低秩瓶颈”问题,对此,通过增大模型key-size对其进行优化。结果表明：所提方法能够显著提升从新闻报道等文本中提取地质灾害种类、发生地点、发生时间等关键信息的容错率及精准率;可得到对地质等灾害空间分布情况和趋势的分析,进而为预案编制、应急资源优化配置、区域监测预警等灾害应急管理工作提供科学分析和决策信息支持。     

非耐短路变压器短路和过载保护试验的自动测试系统

针对变压器产品认证标准GB 19212.1(IEC 61558-1)中关于"短路和过载保护"的型式试验项目,研发了一套智能自动测试系统。对于两种类型的非耐短路变压器,即输入保护和输出保护类型,分别给出了系统软硬件配置和详细的测试操作流程。相比传统手动测试方式,该系统的应用可显著减少人员在线时间,同时降低人工测量环节的不确定度。     

Biotransfer of persistent organic pollutants from a large site in China used for the disassembly of electronic and electrical waste

Samples of groundwater, river water, river sediment, paddy soil, rice seeds, hen eggs, fish, umbilical cord blood, and newborn meconium were collected from October 2002 to October 2003 near a large site in China used for the disassembly of obsolete transformers and other electronic or electrical waste. Six indicator PCB congeners, three non-ortho dioxin-like PCB congeners, and six organochlorine pesticides were determined in the samples by GC with electron capture detector. The results demonstrated that the local environment and edible foods had been seriously polluted by toxic PCBs and organochlorine pesticides. The actual daily intakes (ADIs) of these pollutants were estimated for local residents living in the area. The intake data showed that the contents of PCBs in these local residents were substantial, as the ADI estimates greatly exceed the reference doses set by the World Health Organization and the United States Agency for Toxic Substances and Disease Registry. The presence of the indicator PCB congeners in the cord blood and the meconium samples, as well as significant correlations (r ² > 0.80, p < 0.05) between these levels, suggests a potential biotransfer of these indicators from mothers to their newborns. This preliminary study showed that obsolete transformers and other electronic or electrical waste can be an important source for the emission of persistent organic pollutants into the local environment, such as through leakage, evaporation, runoff, and leaching. Contamination from this source appears to have reached the level considered to be a serious threat to environmental and human health around the disassembly site.     

故障安全控制系统在丙烯腈装置中的应用

介绍了故障安全控制系统在丙烯腈装置中的应用现状及存在问题,利用HAZOP分析方法对问题进行剖析,提出了解决方案,实施后系统运行稳定。     

云朝山雷达站10KV线路雷害分析与防雷措施的研究

该文对张家界云朝山雷达站的雷电活动规律、雷害事故和原有防雷措施进行了认真探讨.结合雷电活动选择性原理深入分析该雷达站雷害事故,指出沿10kv线路来的雷电侵入波是造成雷害的主因.针对原防雷措施在对线路入侵波保护、配电变压器防雷、低压电源保护、接地及等电位联接方面存在的薄弱环节,重点阐述高海拔地区10kv线路的防雷关键措施...