摘要：在此介绍一种高性能的LCD型头盔显示器的视频驱动电路设计。实现了高分辨率DVI视频信号的解码、视频图像处理、LCD驱动等功能。采用FPGA作为硬件平台,对视频信号进行处理、对比度/亮度调节、图像扫描方向控制、LCD驱动时序生成以及MINI-LVDS接口实现等。采用专用芯片产生LCD需要的gamma电压值,实现了0.96英寸的液晶屏的驱动。具有显示分辨率高(1 400×1 050)、参数可调节、接口简单、功耗低等特点。最后通过实物测试,验证了该电路功能。

摘要：大型贮煤场整体式挡煤墙除了考虑堆煤荷载外,由于直径大,环境温度作用对结构的影响很大;煤仓内的堆煤由于氧化作用,导致其温度升高所产生的应力不能忽视。论文分析了某圆形煤仓在堆煤、挡煤墙内外温差、季节温升、季节温降和其他荷载作用工况下煤仓的内力。

摘要：随着互联网技术的普及,高校艺术教育也呈现出网络化的发展趋势。当前,以互联网技术为核心的现代艺术教育技术的创新与应用已成为21世纪教学的重要课题,本文梳理了互联网技术在高校艺术教育中的应用现状,分析了互联网与高校艺术教育结合的重要性,并指出了二者结合的途径形式。

摘要：Advertisement （ad） selection plays an important role in sponsored search, since it is an upstream component and will heavily influence the effectiveness of the subsequent auction mechanism. However, most existing ad selection methods regard ad selection as a relatively independent module, and only consider the literal or semantic matching between queries and keywords during the ad selection process. In this paper, we argue that this approach is not globally optimal. Our proposal is to formulate ad selection as such an optimization problem that the selected ads can work together with downstream components （e.g., the auction mechanism） to achieve the maximization of user clicks, advertiser social welfare, and search engine revenue （we call the combination of these objective functions as the marketplace objective for ease of reference）. To this end, we 1） extract a bunch of features to represent each pair of query and keyword, and 2） train a machine learning model that maps the features to a binary variable indicating whether the keyword is selected or not, by maximizing the aforementioned marketplace objective. This formalization seems quite natural; however, it is technically difficult because the marketplace objective is non-convex, discontinuous, and indifferentiable regarding the model parameter due to the ranking and second-price rules in the auction mechanism. To tackle the challenge, we propose a probabilistic approximation of the marketplace objective, which is smooth and can be effectively optimized by conventional optimization techniques. We test the ad selection model learned with our proposed method using the sponsored search log from a commercial search engine. The experimental results show that our method can significantly outperform several ad selection algorithms on all the metrics under investigation.

摘要：2017年,山东寿光机械林场遗址Ⅰ区、Ⅲ区共清理各类遗迹30余处,包括灰坑、盐井和盐灶等。出土器物有圜底瓮、鬲、豆、盆、罐、瓦等,绝大部分为残片,以圜底瓮残片为大宗,器物年代集中于战国早中期。初步判断该遗址为战国时期一处煮盐作坊。

摘要：基于微波辐射测量原理与天线理论,计算了8 mm辐射计检测绝缘子污秽时天线温度与绝缘子等值附盐密度(ESDD)之间的定量关系,为辐射计的技术指标设定提供了理论参考。依据计算结果,设计并制作了一种适用于电力系统工况条件下绝缘子污秽检测的8 mm狄克型辐射计,对其线性度、灵敏度、稳定度与定标方程等各项性能指标进行了测试。最后,使用该辐射计完成了对XP-70型绝缘子的实验测量。性能测试结果与实验结论均表明,所设计的8mm辐射计能够较准确地测定线路绝缘子的污秽程度。但是,由于天线温度的影响因素较多,实际的工程应用仍需进一步的理论与实验研究。