The outcome of absence epilepsy: a meta-analysis

We performed a meta-analysis of studies on absence epilepsy (AE) to ascertain whether the outcome of this well-defined type of epilepsy can be stated unequivocally. Using the Index Medicus and Medline CD+, we identified 1,619 publications. After applying the criteria of the International League against Epilepsy (ILAE) for AE, 26 publications on 23 study cohorts with a total of 2,303 patients were included. Remission rates ranged from 0.21 to 0.89; they differed substantially due to heterogeneity between the studies in inclusion criteria, methods, follow-up length, and outcome definitions. One half of the patients developed generalized tonic-clonic seizures (TCS) in the course of the disease. The proportion seizure free was 0.78 for patients with absence seizures (AS) only, and 0.35 for those who developed TCS. The outcome of AE may be worse than previously stated due to the considerable proportion of patients developing TCS in the course of their disease. Early prediction of outcome in patients who present with AS cannot be provided with certainty.     

话音VSAT系统突发话音帧的帧处理

本文在简介话音VSAT系统的基础上,分析了在VSAT系统中应用的一类突发话音帧的帧结构;针对突发帧的特点,提出了一种全软件的帧处理方法,给出了性能分析,并在TMS320E17上实现。经过理论分析和实用证明,此方法简单,性能优越。     

功率模块的封装和“一体化”封装——针对可再生能源和电动交通工具

如今的风力发电和电动汽车市场需要具有高功率密度的功率模块、高可靠性以及高的机械、热和电气强度。无焊接压接技术最符合这些要求。下一步,键合线将被弹性金属薄片取代,以克服目前在功率循环疲劳方面的限制。通过将这些技术用于功率模块和这些模块的一体化封装以及通过机械一体化设计嵌入式系统能够实现功率密度方面的卓越性能。     

天线方向图包络要求的发展趋势

本文简述了卫星通信地球站天线方面图包络指标要求的发展,重点论述了当前的发展趋势,同时对几个基本概念进行了说明,对从事卫星通信总体,特别是对从事该类天线技术研制方面有一定参考价值。     

单体液压支柱工作面支护可靠性研究

长期以来煤矿回采工作面支护设计利用安全系数方法表示支护的安全性 ,强调加强支护密度替代支护质量 ,造成工作面生产成本高和效益低。论文利用结构可靠性方法研究了回采工作面支护可靠性设计 ,为提高煤矿工作面支护质量及安全、降低生产成本提出一些建议