Joint impact of CEE and IQI on NOMA with full-duplex relaying system

Wireless Networks - This paper considers the performance of non-orthogonal multiple-access (NOMA) with full-duplex (FD) relaying system in the presence of two practical undesirable defects, namely...     

基于TMS320 C5416芯片的低时延 G.729A声码器的研制

简要介绍了G.729A声码器的编解码算法和定点数字信号处理芯片TMS320C5416,给出了基于TMS320C5416芯片实现低时延的G.729A声码器的硬件和软件设计,并对软件设计过程中应该注意的若干问题进行了分析和总结,最后给出了实时实现的测试结果.     

限量供氧对粟酒裂殖酵母絮凝颗粒酒精发酵的影响及连续发酵工艺的研究

本文以双酶法制备的淀粉糖化糖为底物,首先通过摇瓶分批式发酵实验,研究了限量供氧对粟酒裂殖酵母絮凝颗粒酒精发酵性能的影响,发现限量供氧可以使酒精发酵过程的增酸降低,同时能够有效地阻止絮凝颗粒酵母长期连续使用时发酵活性的衰减。维持颗粒的良好絮凝状态,但发酵终点的残糖有所增高。在此基础上,进行了三级悬浮床反应器串连操作的连续发酵实验,反应器以0.02vvm的通风量使絮凝颗粒酵母均匀悬浮,同时实现限量供氧,当底物糖浓度控制在190～195g几时,反应器以0.165h-1的总稀释率操作,平均设备生产强度达到13.2EtOH/L.h,发酵液中酒精浓度为80.0g/L,总糖转化率为90％。     

利用光外差检测技术的光纤温度传感器

本文报导以频率稳定的纵向塞曼激光器为光源,高度内禀双折射偏振保持光纤为传感元件,并利用光外差检测技术而制作的温度传感器。理论分析了实验系统工作机理,并给出系统主要性能参数。     

MOS型硅功率器件的发展

本文介绍了以MOS技术为基础的新型MOS型硅功率器件的特点,性能水平,发展状况及面临的课题。     

纳秒激光加工石英微通道的实验与理论研究

利用调Q Nd…YAG激光器输出的1064nm纳秒脉冲激光聚焦在石英上,分别采用激光热加工法和激光诱导等离子体法加工微通道。热加工的通道长度可控,通道周围产生热裂纹;诱导等离子体加工的微通道内壁光滑,通道深度可达4mm。研究了激光热加工微通道时的温度场和热应力分布,分析了激光诱导等离子体加工微通道的过程。研究表明,激光热加工时温度场的存在导致热应力的产生,热应力超过石英断裂阈值使石英发生炸裂,导致微通道的形成及热裂纹的产生;激光诱导等离子体法由于等离子体屏蔽效应产生的高温等离子体烧蚀石英形成微通道,避免了热裂纹的产生。     

玻璃圆锥体的缩束特性

为了说明玻璃圆锥体的光缩束特性,根据光折射和全反射原理论证了光在玻璃圆锥体中的传输特点和光束缩束原理,利用光线追迹方法模拟了光在玻璃圆锥体中的传输过程及其对光束的变换效果.理论分析和模拟结果显示,当圆锥体的半顶角等于一系列特定值时,垂直圆锥体底面入射的光束经过该圆锥体后仍沿着其入射方向出射,但光束半径减小,且减小的比率...     

Scene categorization based on local–global feature fusion and multi-scale multi-spatial resolution encoding

With the bag-of-contextual-visual-word (BOCVW) models, we propose a scene categorization method based on local–global feature fusion and multi-scale multi-spatial resolution encoding. First, the performances of the BOCVW models belonging to different features are mutually reinforced by fusing other types of features within local regions. Then, the spatial configuration information is explored using a multi-scale multi-spatial resolution encoding approach. Furthermore, these encoded BOCVW models are globally fused using an improved maximum-margin optimization strategy, which considers the margin between input vectors of different categories and the diameter of the smallest ball containing feature vectors simultaneously. The proposed method has been evaluated on three scene categorization datasets consisting of scene categories 8, 15, and 67, respectively. And its effectiveness has been verified by these experimental results.     

移动互联网时代的终端产业发展趋势

随着全球进入移动互联网时代,移动终端产业正面临深刻变革。介绍了国际智能终端产业的现状,分析了我国终端产业面临的机遇、挑战,以及面向移动互联网的终端产业的发展趋势。     

Distance-Enhancing Constrained Codes with Parity-Check Constraints for Data Storage Channels

This paper proposes efficient distance-enhancing constrained codes with parity-check (PC) constraints for data storage channels. We first propose simple and efficient finitestate encoding methods to design various distance-enhancing constrained codes, including a repeated minimum transition runlength (RMTR) code for optical recording channels, as well as a maximum transition run (MTR) code for magnetic recording channels. We further propose a general and systematic code design methodology, which can efficiently combine constrained codes with PC codes. The constrained codes can be any distanceenhancing constrained codes. The PC codes can be any linear binary PC codes. The rates of the designed codes are only a few tenths of a percent below the theoretical maximum. The proposed method enables soft information to be available to the PC decoder and soft decoding of PC codes. Examples of several newly designed distance-enhancing constrained PC codes are illustrated. Simulation results with blu-ray disc (BD) systems show that the proposed new RMTR code and RMTR constrained 4-bit PC code perform 0.2 dB and 0.85 dB better than the standard 17PP code, respectively, at error correction code (ECC) failure rate (EFR) of 10^-12 and high recording density.