联合频谱映射与掩蔽估计的协作式语音增强方法

为提高目前基于掩蔽与基于频谱映射的语音增强方法性能上界以及复杂环境下的泛化能力,提出了一种在联合复频谱 与复掩蔽学习框架下的协作式单通道语音增强方法。 该方法采用编码器-双分支解码器结构,在编解码部分设计了一种交互协 作学习单元(ICU)来监督交互语音信息流,并提供有效的潜在特征空间;中间层则是设计出一种多尺度融合 Transformer,以少 量参数在空间-通道维度上多尺度地提取细节信息后融合输出,同时对语音子频带与全频带信息建模。 在大、小数据集与 115 种噪声环境下进行实验,结果表明该方法仅以 0. 57 M 的参数量,取得比大部分先进且相关方法更优的主、客观指标,具有良好 的鲁棒性与有效性。     

马拉格锡矿巷道冒顶预测预报研究

通过对马拉格锡矿塘子凹矿段四条巷道冒顶事故多发地段进行岩体结构分析,从２９３个结构体中确定了１１个危险块体进行重点监测,避免了人身事故的发生,确保了生产安全。本文介绍的研究方法为个别危岩冒顶片帮的预测预报研究提供了一条有效的途径。     

Differential MicroRNA Expression in Porcine Endometrium Related to Spontaneous Embryo Loss during Early Pregnancy

Litter size is an important indicator to measure the production capacity of commercial pigs. Spontaneous embryo loss is an essential factor in determining sow litter size. In early pregnancy, spontaneous embryo loss in porcine is as high as 20–30% during embryo implantation. However, the specific molecular mechanism underlying spontaneous embryo loss at the end of embryo implantation remains unknown. Therefore, we comprehensively used small RNA sequencing technology, bioinformatics analysis, and molecular experiments to determine the microRNA (miRNA) expression profile in the healthy and arresting embryo implantation site of porcine endometrium on day of gestation (DG) 28. A total of 464 miRNAs were identified in arresting endometrium (AE) and healthy endometrium (HE), and 139 differentially expressed miRNAs (DEMs) were screened. We combined the mRNA sequencing dataset from the SRA database to predict the target genes of these miRNAs. A quantitative real-time PCR assay identified the expression levels of miRNAs and mRNAs. Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses were performed on differentially expressed target genes of DEMs, mainly enriched in epithelial development and amino acids metabolism-related pathways. We performed fluorescence in situ hybridization (FISH) and the dual-luciferase report gene assay to confirm miRNA and predicted target gene binding. miR-205 may inhibit its expression by combining 3′-untranslated regions (3′ UTR) of tubulointerstitial nephritis antigen-like 1 (TINAGL1). The resulting inhibition of angiogenesis in the maternal endometrium ultimately leads to the formation of arresting embryos during the implantation period. This study provides a reference for the effect of miRNA on the successful implantation of pig embryos in early gestation.     

对工程项目建设中的事故责任在法理上的思考(续)——学习《建设工程安全生产管理条例》的再认识

多年来,建设工程中建设监理的安全职责问题一直是我们监理业界普遍关注的重要热点,特别是《建设工程安全生产管理条例》颁布实施以后对此的关注更趋明显。本刊曾为此发表了多篇探讨文章。2005年第6期曾发表了臧岐同志《对工程项目建设中的事故责任在法理上的思考》一文。时隔两年后,作者又发表续篇。为了方便读者对作者的观点有一个连贯性的了解和认识,特将前文《对工程项目建设中的事故责任在法理上的思考》作为附录,刊登在本文之后。敬请关注。     

基于指针数组的数据划分模式

数据划分是分布主存系统中并行编译的关键技术,它以数组和包含这些数组的嵌套循环为研究对象,以提高数据局部性和挖掘计算并行性为根本目的。传统数据划分模式不适合指向数组的指针数组的数据划分,论文提出了解决该类指针数组数据划分的划分模式,文中称为数组向量的数据划分。分析其数据引用的特性,通过选取代表元,给出数据划分的策略,弥补了现有数据划分研究的不足。     

Artistic preprocessing for painterly rendering and image stylization

A practical image enhancing technique is presented as a preprocessing step for painterly rendering and image stylization, which transforms the input image mimicking the vision of artists. The new method contains mainly two parts dealing with artistic enhancement and color adjustment, respectively. First, through feature extraction and simplification, an abstract shadow map is constructed for the input image, which is then taken as a guide for emphasizing the light–shadow contrast and the important shadow lines. Next, to simulate the intense color emotion often subjectively added by the artist, a color adjustment technique is proposed to generate lively colors with sharp contrast imitating the artistic vision. The preprocessing operation is compatible with existing stylization and stroke-based painterly rendering techniques, and it can also produce different types of stylization results independently.     

直流真空断路器换流频率对开断特性影响研究

直流断路器作为提高直流输电可靠性、灵活性的重要环节, 是一项极具研究意义的关键技术。为给机械式直流断路器的振荡回路参数设计提供指导, 有必要研究换流频率不同时的介质恢复过程以及开断特性。本文对真空断路器弧后介质恢复过程分阶段进行分析, 提出了鞘层预备阶段的概念, 给出了鞘层预备阶段持续时间的计算方法, 进一步发展了鞘层发展理论, 在此基础上通过理论分析和仿真来研究真空断路器换流频率对开断能力的影响, 得到换流频率对开断极限电流的影响规律。     

Assembly of the Complete Mitochondrial Genome of Gelsemium elegans Revealed the Existence of Homologous Conformations Generated by a Repeat Mediated Recombination

Gelsemium elegans (G. elegans) is a Chinese medicinal plant with substantial economic and feeding values. There is a lack of detailed studies on the mitochondrial genome of G. elegans. In this study, the mitochondrial genome of G. elegans was sequenced and assembled, and its substructure was investigated. The mitochondrial genome of G. elegans is represented by two circular chromosomes of 406,009 bp in length with 33 annotated protein-coding genes, 15 tRNA genes, and three rRNA genes. We detected 145 pairs of repeats and found that four pairs of repeats could mediate the homologous recombination into one major conformation and five minor conformations, and the presence of conformations was verified by PCR amplification and Sanger sequencing. A total of 124 SSRs were identified in the G. elegans mitochondrial genome. The homologous segments between the chloroplast and mitochondrial genomes accounted for 5.85% of the mitochondrial genome. We also predicted 477 RNA potential editing sites and found that the nad4 gene was edited 38 times, which was the most frequent occurrence. Taken together, the mitochondrial genome of G. elegans was assembled and annotated. We gained a more comprehensive understanding on the genome of this medicinal plant, which is vital for its effective utilization and genetic improvement, especially for cytoplasmic male sterility breeding and evolution analysis in G. elegans.     

应用正交码组信号的传统雷达距离旁瓣抑制方法

为了抑制传统雷达的距离旁瓣和提高传统雷达抗欺骗式干扰性能,该文提出一种传统雷达随机发射一组正交信号的信号发射策略。给定一组正交性好且距离旁瓣低的相位编码信号,雷达在每次发射时从这组波形中随机选取一个波形进行发射,接收端已知该发射信号波形并基于该波形对接收信号进行脉冲压缩,最后对多次相邻脉冲的回波信号进行相干积累。理论分析和仿真结果均表明,距离主瓣信号能够有效积累,而距离旁瓣信号近似白化,因而脉冲积累后可明显降低系统的最大距离旁瓣电平。     

基于混合压缩感知的分簇式网络数据收集方法

为了减少分簇式传感器网络中的数据传输量并均衡网络负载,提出了一种采用混合压缩感知(compressive sensing, CS)进行数据收集的方法.1)选取各临时簇中距离簇质心最近的一些节点为候选簇头节点,然后依据已确定的簇头节点到未确定的候选簇头节点的距离依次确定簇头;2)各普通节点选择加入距离自己最近的簇中;3)贪婪构建一棵以Sink节点为根节点并连接所有簇头节点的数据传输树,对数据传输量高于门限值的节点使用CS压缩数据传输.仿真结果表明:当压缩比率为10时,数据传输量比Clustering without CS和SPT without CS分别减少了75%和65%,比SPT with Hybrid CS和Clustering with Hybrid CS分别减少了35%和20%;节点数据传输量标准差比Clustering without CS和SPT without CS分别减少了62%和81%,比SPT with Hybrid CS和Clustering with Hybrid CS分别减少了41%和19%.