通信电缆管道和其他地下管线的交越

本文介绍了通信电缆管线与其他专业地下管线交越的一般原则和具体情况应对措施.     

Toward Robust Speech Recognition and Understanding

The principal cause of speech recognition errors is a mismatch between trained acoustic/language models and input speech due to the limited amount of training data in comparison with the vast variation of speech. It is crucial to establish methods that are robust against voice variation due to individuality, the physical and psychological condition of the speaker, telephone sets, microphones, network characteristics, additive background noise, speaking styles, and other aspects. This paper overviews robust architecture and modeling techniques for speech recognition and understanding. The topics include acoustic and language modeling for spontaneous speech recognition, unsupervised adaptation of acoustic and language models, robust architecture for spoken dialogue systems, multi-modal speech recognition, and speech summarization. This paper also discusses the most important research problems to be solved in order to achieve ultimate robust speech recognition and understanding systems. Dr. Sadaoki Furui is currently a Professor at Tokyo Institute of Technology, Department of Computer Science. He is engaged in a wide range of research on speech analysis, speech recognition, speaker recognition, speech synthesis, and multimodal human-computer interaction and has authored or coauthored over 450 published articles. From 1978 to 1979, he served on the staff of the Acoustics Research Department of Bell Laboratories, Murray Hill, New Jersey, as a visiting researcher working on speaker verification. He is a Fellow of the IEEE, the Acoustical Society of America and the Institute of Electronics, Information and Communication Engineers of Japan (IEICE). He was President of the Acoustical Society of Japan (ASJ) from 2001 to 2003 and the Permanent Council for International Conferences on Spoken Language Processing (PC-ICSLP) from 2000 to 2004. He is currently President of the International Speech Communication Association (ISCA). He was a Board of Governor of the IEEE Signal Processing Society from 2001 to 2003. He has served on the IEEE Technical Committees on Speech and MMSP and on numerous IEEE conference organizing committees. He has served as Editor-in-Chief of both Journal of Speech Communication and the Transaction of the IEICE. He is an Editorial Board member of Speech Communication, the Journal of Computer Speech and Language, and the Journal of Digital Signal Processing. He has received the Yonezawa Prize and the Paper Awards from the IEICE (1975, 88, 93, 2003), and the Sato Paper Award from the ASJ (1985, 87). He has received the Senior Award from the IEEE ASSP Society (1989) and the Achievement Award from the Minister of Science and Technology, Japan (1989). He has received the Technical Achievement Award and the Book Award from the IEICE (2003, 1990). He has also received the Mira Paul Memorial Award from the AFECT, India (2001). In 1993 he served as an IEEE SPS Distinguished Lecturer. He is the author of “Digital Speech Processing, Synthesis, and Recognition” (Marcel Dekker, 1989, revised, 2000) in English, “Digital Speech Processing” (Tokai University Press, 1985) in Japanese, “Acoustics and Speech Processing” (Kindai-Kagaku-Sha, 1992) in Japanese, and “Speech Information Processing” (Morikita, 1998) in Japanese. He edited “Advances in Speech Signal Processing” (Marcel Dekker, 1992) jointly with Dr. M.M. Sondhi. He has translated into Japanese “Fundamentals of Speech Recognition,” authored by Drs. L.R. Rabiner and B.-H. Juang (NTT Advanced Technology, 1995) and “Vector Quantization and Signal Compression,” authored by Drs. A. Gersho and R. M. Gray (Corona-sha, 1998).     

大功率扫描信号的失真度分析及对ESM侦收的影响

大功率雷达信号环境模拟器在模拟扫描雷达信号时,由于脉冲行波管放大器的非线性,使得模拟的扫描雷达信号与实际的扫描雷达信号存在一定的失真,影响侦察设备对扫描信号的正确判断。阐述了其对电子支援措施（ESM）侦收设备的影响,并提出可通过增加发射机输出功率和减小与ESM设备之间距离减小模拟雷达信号的失真度。     

论TNV电路的防触电要求

TNV电路会通过空气间隙、绝缘表面爬电距离和接触电流等方面对人体和公共信息网路传递危险能量。文章将从传递危险的电能流通渠道来分析TNV电路的设计要求以及相应的解决方法。     

模块式负压密封型层流罩速度场特性模拟研究

在实验研究的基础上,对层流罩的两个工况进行数值模拟,通过与实验结果比较,证明了选用模型具有较高的计算精度,进而对不同围挡高度下的速度场和污染物浓度场进行模拟,结果表明为了保证围挡内速度场的单向流特性,围挡距地高度不宜大于0.8m,如果考虑工作面的洁净度,围挡高度不宜大于0.5m。和实验结果基本一致。     

广西500kV电网的发展

本文主要介绍广西５００ｋＶ电网今后的发展情况，其中包括来宾～玉林、南宁～平果以及龙滩～柳州～桂林等５００ｋＶ输变电工程的建设；并对来宾火电厂Ｂ厂接入系统、桂西水电开发接入系统及来宾５００ｋＶ变电所扩建等问题提出探讨性意见，以供研究。     

铁型覆砂铸造球墨铸铁曲轴

介绍了铁型覆砂铸造球墨铸铁曲轴的工艺,并就推广应用中发现的铸造缺陷提出了防止措施.     

数码管数字仪表自动识别方法的研究

对计算机实现七段数码管显示的数字字符的自动识别方法进行了研究。利用开放计算机视觉库(OpenCV)和VisualC++6.0组建实验平台,对数码管数字仪表的预处理过程和数字字符的正确分割与识别进行了研究。预处理过程主要包括灰度转换、中值滤波平滑、二值化以及去除噪声等几个方面。分别利用穿线法和模板匹配法对七段数码管式数字仪表进行识别。采用七段数码管式出租车计价器作为原始图像,研究结果表明,这两种方法都能获得比较好的识别效果。     

间隙对5754铝合金激光填丝搭接焊气孔的影响

气孔是5754铝合金激光搭接焊接过程中经常出现的缺陷,它对焊缝的机械性能有很大的影响。实验采用光纤激光器研究了在搭接铝合金板间设置间隙对气孔的影响及其机理,发现,间隙的设置为气孔的逃逸提供了一个通道,气孔率有明显减小的趋势。当间隙从0变化到0.2mm时,由于间隙较小而有毛细现象的发生,搭接间隙气孔的逃逸通道被液态焊缝金属的凝固过程封闭,气孔减小并不明显;当间隙从0.30mm变化到0.75mm时,由于间隙增大,间隙部位的焊缝液态金属发生的毛细现象减弱甚至消失,导致这部分金属距离熔合线很近,表面保持液态,气孔逃逸的通道被打开,气孔有明显减小的变化。实验还发现,随着间隙的增大,搭接焊缝的剪切强度有了很大的提高。     

TO-252晶体管全自动测试/打标分选机设计

文章对带有外观检验功能的TO-252晶体管全自动测试/打标分选机的工作原理、软件和硬件设计进行详细介绍。该设计中首次引入测试推管机构,以解决因TO-252管脚太短、产品管脚与金手指接触不良引起的产品电参数测试误测问题;同时,在生产流程中引入外观检验工位,对测试、打标后的产品打标内容和管脚外型尺寸进行自动检验,很好地避免了成品中出现外观不良的产品。实践证明,该机具有自动化程度高、运行高速可靠、操作安全方便、维护简单、性价比高等优点,客户使用后反映良好。