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计算机“黑屏”、“蓝屏”现象是困扰计算机正常运行两大主要障碍,本文着重分析了造成计算机“黑屏”、“蓝屏”现象的原因并给出解决的方法。 相似文献
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黑屏、蓝屏和静帧现象是数字电视传输中的常见故障,其受SDH保护倒换的影响有多大?是解码器的存储器容量不足吗?这是SDH网络运行维护、前端节目集成和用户终端接收非常关注及迫切需要解决的问题,研究其产生的机理、原因和有效减少其故障的技术措施对数字电视产业的发展和推广有着重要的意义.首先研究了SDH复用段环保护倒换并在建立的保护倒换模型基础上,从得出的保护倒换关系式分析了保护倒换时间与环周长、节点数量的关系;然后以MPEG-2解码模型分析了黑屏、蓝屏和静帧现象的产生机理,讨论了当超过50ms的保护倒换时间对数字电视图像接收质量的影响;最后在分析解码器缓冲器和存储器容量的基础上,提出了保护倒换补偿系统的解决方案. 相似文献
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DIY一台计算机,开机后出现黑屏现象是很多装机者在初期都可能会遇到的问题之一。黑屏产生的原因有两种,一是硬件故障,二是软件冲突。两者的主要区别在发生黑屏的时间,是在开机时发生黑屏,还是正常启动机器后在使用过程中出现黑屏。试用以下思路去解决,相信黑屏问题会很快得到妥 相似文献
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1.故障现象:一台电脑刚开机时使用正常,使用一段时间后,出现蓝屏画面。重新启动后,显示器黑屏且主板发出报警提示声。故障维修:由于电脑使用一段时间后出现故障,故怀疑CPU温度过高所致。切断电源,让电脑休息一段时间,重新启动后能顺利进入系统,并且能够运行各种软件,可工作不久又出现蓝屏现象。再次重新启动进入BIOS,发现“CPU FAN Current speed”项为“Orpm”,即表示CPU风扇已停转。进一步检查CPU温度,发现温度高达70℃,立即关机,切断电源。打开机箱,取下风扇,试着用手扳动叶片,感觉风扇旋转不顺利。在风扇转轴上添加少许缝纫机油,再次用手扳动已能灵活转动。将风扇安装还原,开机运行,一 相似文献
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刘景云 《电子产品维修与制作》2014,(14):69-71
当在使用电脑室时,如果明显感到系统运行变慢的话,可能就是由于某些进程违规运行的结果,他们占用过多的资源,可能造成蓝屏,黑屏,死机等故障。那如何进程的有序运行呢?本文问您详细介绍通过代码调整进程运行的方法! 相似文献
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遵义广电网络自2006年整体平移以来,对维护中常见的几种节目黑屏现象进行总结,大致分为前端、网络、终端机顶盒等原因造成节目黑屏现象。 相似文献
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不合格产品不仅会造成企业资源的浪费、成本的提高,在出厂之后,还会给顾客带来损失,从而造成顾客不满,给企业的形象造成负面影响.本文主要对制造业企业不合格品如何分类、标记、处理和防控等措施作了详细的介绍,以期能够对制造业企业在不合格品的管理过程中起到实际的指导意义. 相似文献
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SMT生产线要达到最大的产量和良好的产品质量,SMT生产线设备必须得到良好的维护和维修。贴片机是SMT生产线中的关键设备,抛料又是贴片机常见的故障现象,处理好贴片机抛料问题,即提高了贴片机贴装率,降低了贴片机的抛料率,且对降低生产成本和提高产品质量具有十分重要的作用。以西门子贴片机(机器型号:HS50、80S20和80F4)为例,介绍了贴片机抛料的成因和解决办法。 相似文献
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An analytical performance evaluation model is presented for selective reject (SREJ) ALOHA, a recently proposed high-capacity protocol for unslotted channels with high propagation delay. SREJALOHA approaches the theoretical asynchronous multiaccess throughput limit of 0.368 for fixed or variable length message traffic, using subpacketization of messages in conjunction with a selective reject retransmission policy. A finite user flow equilibrium-based model for SREJ-ALOHA with variable length messages is derived and used to characterize stability, throughput, and delay. Particular attention is given to the development of a stability analysis methodology for unslotted ALOHA-type protocols with variable length transmissions. Numerical results based on a satellite channel example are presented to demonstrate the significant performance advantages offered by SREJ-ALOHA, even after accounting for realistic subpacket overheads. 相似文献
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针对纠错输出编码分解框架的自身特点、从降低误判风险出发,研究了带拒绝域的ECOC多类分类方法.首先在二类划分过程中引入拒绝域,对不属于正负子类的待识别样本进行拒识;其次,在基分类器内部引入拒绝域,以最小化风险贝叶斯决策为目标,利用后验概率输出和代价矩阵寻找拒绝域阈值,对样本输出值落入拒绝域中的样本进行拒识;最后,研究了不同拒绝域输出的解码方法,并讨论了拒识码字个数和矩阵最小Hamming距离之间的关系.实验结果表明基于二类划分构造的拒绝域能够提高分类正确率,而基于基分类器构造的拒绝域能够减小分类代价. 相似文献
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This study compared the effects on performance of four features of the LAPB and LAPD protocols. LAPB is the link level for the X.25 protocol, and LAPD is the link level for the ISDN "D" signaling channel. The features were: multireject in which additional reject or selective reject frames can be retransmitted under certain conditions, selective reject in which an entity can request selected frames to be retransmitted, the null information frame (NIF) with which additional control frames are sent to help detect missing frames, and multiple service access points (SAP's) in which several link-level protocol handlers are multiplexed on the same physical link (a feature unique to LAPD). Results indicate that the current standard LAPB/D protocol with multireject is the preferred protocol. Selective reject generally performed worse than the standard protocol, and offered improvement only with complex and expensive enhancements. The NIF feature yielded a virtually unnoticeable performance improvement. Multi-SAP introduced a virtually unnoticeable impairment when it was used to carry the same traffic load as a single SAP. 相似文献
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We present a new framework for real-time tracking method of complex non-rigid objects. This new method successfully coped with camera motion, partial occlusions, and target scale variations. The shape of the object tracker is approximated by an ellipse and its appearance by histogram based features derived from local image properties. We use an efficient search scheme (Accept–Reject color histogram-based method (AR), using Bhattacharyya kernel as a similarity measure) to find the image region with a histogram most similar to the target of object tracker. In this paper, we address the problem of scale/shape adaptation and orientation changes of the target. The proposed approach is compared with recent state-of-the-art algorithms. Extensive experiments are performed to testify the proposed method and validate its robustness and effectiveness to track the scale and orientation changes of the target in real-time. 相似文献