利用卷积神经网络的车道线检测方法

车道线检测是自动或智能辅助驾驶的核心问题之一。本文主要研究单目视觉下车道线检测算法。车道线具有多样性,其存在的环境又具有复杂性,因此准确高效车道线检测是一个具有挑战性的问题。本文提出了一种新的车道线检测算法,在传统车道检测方法中引入深度学习模型,主要包括下了步骤:首先使用基于车道线先验特征的图像增强算法进行边缘增强,对于边缘增强后的图像采用线段检测器进行线段提取,然后利用卷积神经网络构造线段分类器排除线段噪声,最后通过对消失点聚类排除无关线段,并按斜率聚类产生主车道线。实验表明,本文实现的算法具备较强的鲁棒性和很高的检测准确度。      

Directional notch filters for motion control of flexible structures

A new method to design notch filters for MIMO motion control systems with flexible mechanical structures is proposed. The method involves so-called directional notch filters that work only in the direction of the targeted resonant mode. As a result, only one SISO notch filter is required per mode to suppress a resonance throughout the MIMO system. Compared to the conventional approach where a notch filter is placed and tuned in each of the separate control loops, the new approach reduces the order of the controller significantly and facilitates the design process. The directional notch filter is computed using either the input or output mode shapes of the system. A new numerical optimization method to obtain these mode shapes from frequency response data is described. Experiments on a flexible beam setup demonstrate the feasibility of the proposed method in practice.     

CPW-fed planar ultra wideband antenna having a frequency band notch function

A CPW-fed planar ultra-wideband antenna with hexagonal radiating elements is presented. The antenna also has a frequency band notch characteristic. By inserting a V-shaped thin slot on the hexagonal radiating element, the narrow frequency band notch has been created very close to the desired frequency.     

Petri nets and integrality relaxations: A view of continuous Petri net models

Petri nets are formalisms for the modeling of discrete event dynamic systems (DEDS). The integrality of the marking and of the transitions firing counters is a clear reflection of this. To reduce the computational complexity of the analysis or synthesis of Petri nets, two relaxations have been introduced at two different levels: (1) at net level, leading to continuous net systems; (2) at state equation level, which has allowed to obtain systems of linear inequalities, or linear programming problems. These relaxations are mainly related to the fractional firing of transitions, which implies the existence of non-integer markings. We give an overview of this emerging field. It is focused on the relationship between the properties of (discrete) PNs and the corresponding properties of their continuous approximation. Through the interleaving of qualitative and quantitative techniques, surprising results can be obtained from the analysis of these continuous systems. For these approximations to be "acceptable", it is necessary that large markings (populations) exist. It can also be seen, however, that not every populated net system can be continuized. In fact, there exist systems with "large" populations for which continuation does not make sense. The possibility of expressing nonlinear behaviors may lead to deterministic continuous differential systems with complex behaviors.     

High reliability, high density, low cost packaging systems formatrix systems for matrix BGA and CSP by vacuum printing encapsulationsystems (VPES)

Ball grid array (BGA) and chip scale package (CSP) packaging markets are increasing. In general, transfer molding systems are used for these packaging processes. However, transfer molding systems are difficult to change the model for high expensive metal die. This paper describes a unique vacuum printing encapsulation system (VPES) we developed to solve such problems with lower cost than transfer molding. We used matrix type BGA and CSP for this test. Matrix type BGA and CSP make it easy to use printing technology for die-bonding, packaging, marking, and flux coating process. The total cost of this packaging is cheaper than the transfer molding process. We developed very low warpage and high reliability epoxy resin for matrix BGA and CSP. We succeeded in achieving high reliability and low cost packaging systems with this technology     

Application of SVD on Suppression of IEEE 802.11a Interference in TH‐PAM UWB Systems

Interference from IEEE 802.11a systems affects ultra‐wideband (UWB) systems significantly. In this letter, we suggest a novel narrow‐band interference (NBI) suppression technique based on the singular value decomposition (SVD) algorithm in time‐hopping pulse amplitude modulation (TH‐PAM) UWB systems. The SVD algorithm is used to approximate the interference which then is subtracted from the received signals. In contrast to the conventional notch filter and rake receiver, our method is more effective and the receiver complexity can be greatly reduced.     

阵列式激光打标机点阵库的动态链接库实现方法

激光打标较传统的打标方式有诸多优点,在许多领域得到了广泛应用。阵列式激光打标机是实现高速在线打标的最佳选择。在阵列式激光打标机的控制中,字符点阵信息的有效组织和管理是非常重要的。本文提出了一种用动态链接库的方法来管理点阵库,从而使修改或更新点阵库变得非常容易,还能节省系统的内存开销,具有其它方法无可以拟的优点。     

Suppression of IEEE 802.11a interference using SVD-based algorithm for DS-UWB systems in wireless multipath channels

IEEE 802.11a systems which operate around 5 GHz and overlap the band of UWB signals will interfere with UWB systems significantly. In this letter, a novel narrow-band interference (NBI) suppression technique based on the singular value decomposition (SVD) algorithm is proposed in direct sequence ultra-wideband (DS-UWB) systems in wireless multipath channels. SVD is used to approximate the interference which then is subtracted from the received signals. In contrast to the conventional suppression methods such as the notch filter and the maximal-ratio combining partial RAKE (MRC PRAKE) receiver, our proposed technique is simple and robust, the hardware complexity of the receiver can be reduced greatly.     

Design and Fabrication of Fiber Bragg Gratings With V-Shaped Dispersion Profile

We propose a new type of fiber Bragg grating (FBG) with a V-shaped dispersion profile. We demonstrate that such V-shaped FBGs bring advantages in manipulation of optical signals compared to conventional FBGs with a constant dispersion, e.g., they can produce larger chirp for the same input pulsewidth and/or can be used as pulse shapers. Application of the proposed V-shaped FBGs for signal prechirping in fiber transmission is examined. The proposed design of the V-shaped FBG can be easily extended to embrace multichannel devices     

基于P-V双因素的网络激光标刻性能研究

传统激光标刻技术已在实际工业生产中普遍应用,但其系统最优标刻性能控制参数存在寻找及设置较为困难、繁琐等问题。针对该问题,本文设计了一种基于嵌入式网络激光标刻模式的新型激光标刻控制模型,并在该模型下通过相关数据预处理算法分析单一标刻影响因素对激光标刻性能的影响;再通过对实验数据的数理统计分析得出二值图像的标刻性能变化规律,最终得出在该材质及类似组成工件下的激光标刻的最优参数快速选择模型和性能最优值域。研究结果表明,该模型为最优激光标刻性能控制参数的快速选择提供了可靠的方法,为进一步研究激光标刻性能影响参数提供了重要参考。     

激光标刻铝合金2维码的手机识读特性研究

随着近年来智能手机设备的快速普及,2维码已经在商业零售、电子商务领域获得飞速发展。为了拓展2维码在工业制造领域金属零件直接零件标识方面的应用,采用激光标刻填充方式与识读环境的结合调控方法,进行了理论分析和实验验证,取得了铝合金表面激光标刻2维码的手机识读特性数据。结果表明,由于工艺参量不同,铝合金表面的激光标刻区域将呈现白色、灰色直至黑色的对比度效果,通过设置镜像识读环境条件,并反转2维码标刻,可以有效解决常规激光标刻白色2维码的无法识读问题。这一结果对开发智能手机2维码识读软件算法、提高激光标刻效率是有帮助的。     

Multisim 2001在基于UAF42陷波器设计中的应用

目前地球物理勘探（物探）工作使用的专业电子仪器的工作频率都较低,所以在物探仪器中运用陷波器相当普遍,特别是用于压制50 Hz电力线的干扰方面.为了压制50 Hz的工频干扰,要在仪器的信号调理部分采用陷波器电路.为了设计和优化基于UAF42的新型陷波器电路,采用Multisim 2001进行仿真实验.Multisim 2001借助虚拟现实技术,使设计者能快速地模拟、分析、验证所设计电路的性能.与传统方法相比,这种虚拟技术既省时又经济,而且还可避免实验中发生的各种损坏和事故.本文利用基于UAF42设计的50Hz陷波器的仿真电路,对陷波器的频率响应进行了仿真.仿真结果表明,基于UAF42的50 Hz陷波器达到了设计目的和要求,并证明了Multisim 2001在电路设计中的重要作用.     

National Network Operation Center for Ethiopian Telecommunications Corporation

Ethiopian Telecommunications Corporation (ETC) has acquired a patchwork of systems and processes that makes it difficult to cost-efficiently troubleshoot network faults, launch new services quickly, and track and tune the performance of services once delivered. This patchwork also results in increased operational and capital expenditures, so there is an obvious need for ETC to improve and evolve the network and service management environment. Evolving ETC’s network and service management systems and processes shall be done in a well organized phased approach. ZTE is the first choice for ETC to assume this challenging responsibility and provide the National Network Operation Center (NNOC) solution.     

结构化道路车道线的鲁棒检测与跟踪

针对智能车在视觉导航过程中车道线检测的鲁棒性和实时性问题,提出一种适用于结构化道路的车道线鲁棒检测与跟踪方法。首先,简化的Sobel算子提取车道线边缘图像,将边缘图像与改进的Otsu方法得到的车道线分割图像进行融合,实现对车道线标记点的鲁棒检测;然后,采用迭代最小二乘方法拟合车道线标记点并去除干扰点,并根据拟合参数建立车道线模型;最后,引入尺度无迹卡尔曼滤波(SUKF)对车道线进行跟踪。通过对多段实地采集的视频进行了仿真实验,结果表明,该方法对于高速公路车道线的检测率可达到99%,并具有较好实时性能;对于受损和弄污的城市道路车道线也体现出较好的鲁棒性和时间性能。     

A new high-performance color picture tube: The mask-focusing color tube

From a technical point of view, improvements of conventional color picture tubes could be regarded as having reached their limits. In this respect, we have found that the mask-focusing tube can achieve further improvements when combined with the black-matrix technique, a high-performance gun, dot screen structure, high-matrix transparency, and large gun electrode diameter. Two-fold improvements of brightness and contrast have been obtained with mask transparency twice that of conventional tubes, 22-percent higher matrix transparency, and mask-focusing. A 20-30 percent less deflection power has also been achieved with 110° deflection, neck diameter, and 1:2 mask-focusing voltage ratio. A 20-percent less spot diameter and a sharp beam distribution have been obtained by a new multistage-focusing electron gun in a delta arrangement in the 35.5-mm neck diameter.     

陶瓷封装激光打标工艺研究

激光打标作为一种新型的标记技术,在半导体行业有着愈发重要的应用。文章简单介绍了激光打标机原理及控制系统,并通过对陶瓷封装过程中镀镍柯伐盖板表面的打标工艺试验及结果分析,研究了激光功率、频率、速度、延时等参数对标记效果的影响。研究结果表明,激光功率和速度对标记效果的影响呈线性规律,频率无线性规律可寻,但存在一最佳值区域;延时参数的设置不当会导致某些点标记过重或线条缺笔、字符变形等。     

镀金盖板上的绿激光标识技术

镀金盖板广泛用于军品集成电路的气密性封装中,其表面标识通常采用油墨移印工艺,但油墨移印的标识在筛选或考核过程中有时存在部分脱落的风险,造成鉴定难以通过。在镀金盖板上的绿激光标识技术,不仅解决了镀金盖板标识脱落的问题,而且解决了高可靠集成电路镀金盖板表面标识产品序列号的工艺难题。激光标识后的样品,顺利通过了按GJB548B要求进行的温度循环、热冲击、耐溶剂和盐雾等可靠性试验。对镀金盖板的激光标识区域进行了电镜扫描和解剖分析的结果表明,标识区域镀金层成份和金层厚度基本没有变化。     

一种基于深度学习的公路巡检无人机实时目标跟踪算法

公路中心标线的实时跟踪是公路巡检无人机视觉飞行中关键的一环.针对目前主流目标跟踪算法实时性差的问题,提出一种基于改进YOLO(you only look once)v3和Deep-SORT(deep simple online real-time tracking)的目标跟踪模型用于公路巡检无人机自主视觉飞行.通过引入并改进跨阶段局部网络,优化网络层级结构,使用泛化能力更好的激活函数,提升了公路道路标线的检测准确率和无人机平台的检测速度.对检测到的公路标线信息使用Deep-SORT算法进行公路中心标线跟踪.实验结果表明,与几类典型目标跟踪模型相比,在跟踪准确度基本不变的情况下,处理速度提升了数倍.     

Gradient-based multiresolution image fusion

A novel approach to multiresolution signal-level image fusion is presented for accurately transferring visual information from any number of input image signals, into a single fused image without loss of information or the introduction of distortion. The proposed system uses a "fuse-then-decompose" technique realized through a novel, fusion/decomposition system architecture. In particular, information fusion is performed on a multiresolution gradient map representation domain of image signal information. At each resolution, input images are represented as gradient maps and combined to produce new, fused gradient maps. Fused gradient map signals are processed, using gradient filters derived from high-pass quadrature mirror filters to yield a fused multiresolution pyramid representation. The fused output image is obtained by applying, on the fused pyramid, a reconstruction process that is analogous to that of conventional discrete wavelet transform. This new gradient fusion significantly reduces the amount of distortion artefacts and the loss of contrast information usually observed in fused images obtained from conventional multiresolution fusion schemes. This is because fusion in the gradient map domain significantly improves the reliability of the feature selection and information fusion processes. Fusion performance is evaluated through informal visual inspection and subjective psychometric preference tests, as well as objective fusion performance measurements. Results clearly demonstrate the superiority of this new approach when compared to conventional fusion systems.     

Reconfigurable phase-locked loops on FPGA utilising intrinsicsynchronisability

A new digital phase-locked loop (PLL), utilising the intrinsic synchronisability of electrical oscillators, on a field-programmable gate array has been developed. By interconnecting such PLLs, a dynamically reconfigurable clock network was formed. This has previously been difficult with conventional PLL techniques