短波调制解调器性能研究

分析了短波调制解调器的基本工作原理,并对两种标准的串行和并行短波调制解调器进行了性能测试和比较,对两种体制的短波调制解调器在数字话音和数据传输中的应用进行了分析。     

井间参数预测的相控神经网络模型

本文提出了一种基于微相研究的神经网络井间参数内插预测新方法。该方法结合油藏微相研究成果，采用井位和微相信息作为神经网络的输入参数，对储层参数进行空间预测。本文以孤岛油田渤21断块油藏为例，利用空间分散井位点的渗透率资料和地区沉积微相信息进行井间渗透率内插预测。结果表明，该方法不仅可以方便地将一些先验的地区知识和专家经验用于井间参数预测之中，而且大大提高了井间参数的预测精度，为油藏建模提供了可靠的基础。     

相互作用绘景中态矢和算子演化的理论分析

针对量子力学中的相互作用绘景，导出了态矢和算子的演化规律，从理论上阐述了该态矢和算子和其它绘景中的态矢和算子间的内在联系，这为在相互作用绘景中处理问题提供了有益的理论依据。     

Examination of the Influence of Heat Treatment on the Properties of AI‐Si Alloys

In this paper the influence of heat treatment on the structural and mechanical properties of Al‐Si alloys was investigated. Silicon content in the examined alloys was in the range 11 to 14%, the contents of the other alloying elements were in the standard range [1] but all alloys were modified with strontium. The regime of the applied heat treatment was quenching (520°C/6h – cooling in water) + aging (205°C/7h –air cooling). The examinations were carried out at room temperature as well as at 250°C and 300°C. The obtained results showed a positive influence of the applied heat treatment on the mechanical properties of the examined alloys. The improvement of the mechanical properties can be considered as a consequence of a redistribution and change of morphology of the phases present in the structure of the alloys.     

Economic Analysis on Rent of Equipment Lease of Coal Enterprise

Rent is the key factor in equipment lease. The business that equipment lease company of coal milling often engaged ill can be divided into three kinds, that is sublease, operating lease and inter lease, in lenn of the difference of the role of lease, character of business, object of the trade and condition of the market. The problem in rent calculating of the three kinds of lsase that equipment lease company of coal mining often involved was analyzed. Hope to be helpful to the decision-making of the equipment lease company of coal mining.     

Measuring Economic Externalities of IT and R&D

We measure and compare externalities of IT and R&D capital stocks in different Korean industry sectors using inter‐industry input‐output tables of 1985, 1990, 1995 and 2000. We also compute the multiplier effects that relate to the directions of future economic effects. The key findings are as follows. First, we observed continuous capital deepening in all nine industries over the period of 1985 to 2000. Second, the backward multipliers of IT capital were the highest in the manufacturing industry. As for inter‐industry externalities, the indirect backward multipliers, which exclude intra‐industry backward multiplier effects within the industry, were also the highest in the manufacturing industry. Third, the forward multiplier effects of IT capital stock were the most substantial in the construction industry during the 1980s and in the manufacturing industry thereafter. Finally, using the transition multiplier matrix reflecting the backward effects of the two capitals in the past, the economic backward effects, especially the external economic effects, are predicted to increase through 2010 among all industries. The above findings suggest that, in order to maximize the forward and backward effects of the ever‐increasing IT capital, we need to formulate an industry policy reducing the cost of capital accumulation in the manufacturing industry through improvement in productivity of the IT industry.     

有关OCTIR梳毛机的3项改进

文中详细介绍了意大利OCTIR2500MM型梳毛机的3点技术改造,包括末道夫针布保护、末道夫出条机的改进、梳毛机过桥帘底帘升毛帘处的传动结构改进,通过试验证明,此项改进改装费用较低,降低了设备备件的损耗,效果非常显著。     

基于多肤色模型的人脸检测系统研究

对用于人脸检测系统的多种肤色模型进行了研究,详细分析了固定阈值分割法、高斯肤色模型法和最大类间方差法,并分别在加州理工大学彩色人脸库上进行了仿真实验。实验结果表明,在不同的光照条件和背景环境下,3种肤色模型分割效果并不一致,而主要影响因素就是光照条件。通过大量数据分析,统计出3种模型能达到最好分割效果时的光照条件。结合Y通道信息,提出根据光照条件自动切换3种肤色模型的人脸检测算法。相对于过去单一肤色模型的人脸检测系统,本系统更稳定,更能适应环境。     

A single‐bit continuous‐time delta‐sigma modulator using clock‐jitter and inter‐symbol‐interference suppression technique

This paper presents a technique for mitigating two well‐known DAC non‐idealities in continuous‐time delta‐sigma modulators (CTDSMs), particularly in wide‐band and low over‐sampling‐ratio (OSR) cases. This technique employs a special digital‐to‐analog convertor (DAC) waveform, called modified return‐to‐zero (MRZ), to reduce the time uncertainty effect because of the jittered clock at the sampling time instances and eliminate the effect of inter‐symbol‐interference (ISI) which degrades the modulator performance, especially when non‐return‐to‐zero (NRZ) DAC waveform is chosen in the modulator design. A third‐order single‐bit CTDSM is designed based on the proposed technique and step‐by‐step design procedure at circuit and system levels, considering clock jitter and ISI, is explained. Circuit simulations in 180‐nm CMOS technology show that in the presence of circuit non‐idealities which generate jitter and asymmetrical rise and fall times in the DAC current pulse, signal‐to‐noise‐distortion‐ratio (SNDR) of the proposed modulator is higher than the conventional modulator with NRZ waveform by about 10 dB. In these simulations, clock jitter standard deviation is 0.3% of the sampling period (T_S) and the difference between fall/rise times in the DAC current pulse is 4%T_S. Simulated at 600‐MHz sampling frequency (f_S) with an oversampling ratio (OSR) of 24, SNDR figure of merit (FOM_SNDR) of the proposed modulator in 180‐nm CMOS is 300 fj/conversion. Copyright © 2016 John Wiley & Sons, Ltd.     

An efficient inter prediction mode selection scheme for advanced video coding based on motion homogeneity and residual complexity

Modern video coding standards such as High Efficiency Video Coding (HEVC) and H.264/MPEG‐4 advanced video coding (AVC) supersede the previous coding standards because of their improved coding efficiency. These standards adopt variable block sizes in frame coding ranging from 4 × 4 to 16 × 16 and 4 × 4 to 64 × 64 for H.264/AVC and HEVC, respectively. The use of variable block sizes for inter prediction provides a significant coding gain compared to coding a macroblock (MB) using regular block size. However, this new feature greatly increases the computational complexity of the encoder when brute‐force rate distortion optimization (RDO) algorithm is used for coding parameter selection. This paper proposes an efficient inter prediction mode selection scheme based on motion homogeneity and residual complexity measures of an MB to speed up the encoding process. The motion homogeneity is assessed through the normalized motion vector (MV) field, and residual complexity is evaluated by the sum of absolute difference (SAD). To acquire the MVs and SADs, motion estimation at 8 × 8 block size is performed using a lightweight recursive motion estimator in which the vector field tends toward true object motion. Based on motion homogeneity and residual complexity of an MB, only a small number of inter prediction modes are selected for the RDO process. The experimental results for H.264/AVC show that the proposed scheme reduces the encoding time by 64% on average without any significant degradation of coding efficiency. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.