综采与机掘巷道交锋时支护技术研究

燕子山矿4~#综放工作面为动压开采,临空巷矿压显现强烈,在实践生产中,302盘区5210巷与8212工作面形成相向采掘交锋,原有支护难以对围岩变形量进行有效控制。通过对掘进巷道锚杆、煤柱留设宽度、回采工作面溜子道等支护参数重新设计,有效缓解了围岩变形程度,实现了工作面安全过交锋地。     

基于Toffoli门族的可逆优先编码器的设计

利用函数变换法,以Toffoli门族为基础,设计了一种可逆二-十进制优先编码器。提出了一种新的函数置换法综合算法,并引入4×4 Toffoli门对电路进行优化。利用Quartus II软件对电路进行设计与仿真,并搭建了FPGA测试平台进行验证。验证结果表明,电路逻辑功能正确,优化后各项性能指标有所提高,与优化前相比,量子门总数减少约31%,垃圾输出减少约32%,量子代价减少约2%,常量输入减少约36%,为减小芯片面积奠定了基础。     

一种基于密度峰值聚类的图像分割算法

聚类作为一种有效的图像分割方法,被广泛地应用于计算机视觉领域。相较于其他聚类方法,密度峰值聚类(DPC)具有参数少且能有效识别非球形聚类的特点。基于此,引入信息论中的不确定性度量熵,提出一种改进的DPC图像分割算法。将图像像素点的颜色空间CIE Lab值作为特征数据,通过计算信息熵求得自适应截断距离以取代经验取值,建立相应的决策图并确定聚类中心总数,归类非聚类中心点,剔除噪声点从而完成图像分割。在Berkeley数据集上的实验结果表明,该算法能较好地实现彩色图像的分割,其平均分割时间和PRI指标分别为14.658 s和0.721。     

基于集合经验模态分解和信号结构分析的心电信号R波识别算法

R波作为确定心电信号各波段的重要参考,是心电自动分析的前提。针对大多数R波识别算法的预处理过程影响识别准确度和耗时问题,该文提出一种基于集合经验模态分解(EEMD)和信号结构分析的算法对带噪心电信号(ECG)的R波直接进行识别。首先通过EEMD将带噪声的心电信号分解成一系列本征模态分量,然后对分解后的各模态分量作独立成分分析以提取出R波特征最明显的成分,对该成分进行结构分析,从而实现对R波的准确定位。仿真结果表明,该文算法对带噪声心电信号的R波识别具有更优性能,对异常心电信号的R波识别也具有明显效果。     

A novel construction method of QC-LDPC codes based on CRT for optical communications

A novel construction method of quasi-cyclic low-density parity-check (QC-LDPC) codes is proposed based on Chinese remainder theory (CRT). The method can not only increase the code length without reducing the girth, but also greatly enhance the code rate, so it is easy to construct a high-rate code. The simulation results show that at the bit error rate (BER) of 10-7, the net coding gain (NCG) of the regular QC-LDPC(4 851, 4 546) code is respectively 2.06 dB, 1.36 dB, 0.53 dB and 0.31 dB more than those of the classic RS(255, 239) code in ITU-T G.975, the LDPC(32 640, 30 592) code in ITU-T G.975.1, the QC-LDPC(3 664, 3 436) code constructed by the improved combining construction method based on CRTand the irregular QC-LDPC(3 843, 3 603) code constructed by the construction method based on the Galois field (GF(q)) multiplicative group. Furthermore, all these five codes have the same code rate of 0.937. Therefore, the regular QC-LDPC(4 851, 4 546) code constructed by the proposed construction method has excellent error-correction performance, and can be more suitable for optical transmission systems.     

A novel construction scheme of QC-LDPC codes based on the RU algorithm for optical transmission systems

A novel lower-complexity construction scheme of quasi-cyclic low-density parity-check (QC-LDPC) codes for optical transmission systems is proposed based on the structure of the parity-check matrix for the Richardson-Urbanke (RU) algorithm. Furthermore, a novel irregular QC-LDPC(4 288, 4 020) code with high code-rate of 0.937 is constructed by this novel construction scheme. The simulation analyses show that the net coding gain (NCG) of the novel irregular QC-LDPC(4 288,4 020) code is respectively 2.08 dB, 1.25 dB and 0.29 dB more than those of the classic RS(255, 239) code, the LDPC(32 640, 30 592) code and the irregular QC-LDPC(3 843, 3 603) code at the bit error rate (BER) of 10-6. The irregular QC-LDPC(4 288, 4 020) code has the lower encoding/decoding complexity compared with the LDPC(32 640, 30 592) code and the irregular QC-LDPC(3 843, 3 603) code. The proposed novel QC-LDPC(4 288, 4 020) code can be more suitable for the increasing development requirements of high-speed optical transmission systems.     

基于单片机的便携式脉冲信号参数测试仪

本文介绍了基于C8051F340单片机的脉冲信号参数测试仪的设计与实现。该测试仪能对脉冲信号的幅值、频率、周期、占空比等参数进行测量。通过采用10次定数计时法,提高测量精度,缩短测量时间。实验测试表明,该测试仪的误差率较低,精度高,能够满足闪光盒性能测试与校验的要求,可用于电信号参数测量、仪器检测等领域。该测试仪已应用于某型军用飞机闪光盒信号检测中,其稳定性、精确性均能满足要求。     

MEMS白血病细胞介电电泳芯片的研究

研究了白血病细胞介电电泳芯片,其核心结构由绝缘覆盖层、电极层和绝缘垫层构成.该文对该芯片中的微电极进行了电场力学分析,讨论并设计了芯片的各个参数,应用微机电系统(MEMS)技术成功制备芯片,并对芯片进行了双列直插式DIP封装.文中研究的白血病细胞介电电泳芯片具有微型化,低电压驱动,对细胞无化学毒害等优点.     

基于智能终端的血氧信号采集装置设计

血氧饱和度是指血液中氧合血红蛋白(Hb O2)的容量占全部血红蛋白(Hb)容量的百分比,即血液中血氧的浓度。通过对人体血氧饱和度的检测,能够有效的判断人体循环系统和呼吸系统的功能是否正常。目前指夹透射式检测技术发展已相对成熟,但这种检测方法,只适用于对住院病人的监护,而无法进入社区乃至家庭。因此本文基于对反射式血氧饱和度的实时检测硬件装置的研究,结合消除干扰的算法,设计出一种适用于家庭和社区的基于智能终端便于携带的血氧饱和度检测装置。     

A novel BTC decoding algorithm based on the genetic algorithm in optical communication systems

Combining the advantages of both the genetic algorithm （GA） and the chase decoding algorithm, a novel improved decoding algorithm of the block turbo code （BTC） with lower computation complexity and more rapid decoding speed is proposed in order to meet the developing demands of optical communication systems. Compared with the traditional chase decoding algorithm, the computation complexity can be reduced and the decoding speed can be accelerated by applying the novel algorithm. The simulation results show that the net coding gain （NCG） of the novel BTC decoding algorithm is 1.1 dB more than that of the traditional chase decoding algorithm at the bit error rate （BER） of 10^-6. Therefore, the novel decoding algorithm has better decoding correction-error performance and is suitable for the BTC in optical communication systems.