An enhanced dynamic hash TRIE algorithm for lexicon search

Information retrieval (IR) is essential to enterprise systems along with growing orders, customers and materials. In this article, an enhanced dynamic hash TRIE (eDH-TRIE) algorithm is proposed that can be used in a lexicon search in Chinese, Japanese and Korean (CJK) segmentation and in URL identification. In particular, the eDH-TRIE algorithm is suitable for Unicode retrieval. The Auto-Array algorithm and Hash-Array algorithm are proposed to handle the auxiliary memory allocation; the former changes its size on demand without redundant restructuring, and the latter replaces linked lists with arrays, saving the overhead of memory. Comparative experiments show that the Auto-Array algorithm and Hash-Array algorithm have better spatial performance; they can be used in a multitude of situations. The eDH-TRIE is evaluated for both speed and storage and compared with the naïve DH-TRIE algorithms. The experiments show that the eDH-TRIE algorithm performs better. These algorithms reduce memory overheads and speed up IR.     

经销关系中双边道德风险的一种契约解决机制

对于需要进行专用性资产投资或通过契约安排形成专用性资产投资的经销关系中,往往会存在双边道德风险:一是生产商敲竹杠的道德风险;二是经销商隐蔽行为的道德风险。本文通过一个简单的不完全契约安排试图解决这种双边道德风险,以取得社会最优投资,促使交易的完整进行。     

变频器内建PLC在上料机改造中的应用

结合青海百通公司的高炉情况,设计出了上料机改造方案。介绍了台达变频器在高炉卷扬调速系统中的应用情况,给出了电气原理图、注意事项和常见故障处理。实际应用的良好效果验证了该系统的稳定性和可靠性。     

全自动洗衣机用直联单相盘式电动机的设计

介绍家用波轮型全自动洗衣机用直联单相电容运转盘式电动机的结构特点,主要性能指标以及在 研制过程中遇到的问题。     

On the importance of the long-term seasonal component in day-ahead electricity price forecasting with NARX neural networks

Daily and weekly seasonalities are always taken into account in day-ahead electricity price forecasting, but the long-term seasonal component has long been believed to add unnecessary complexity, and hence, most studies have ignored it. The recent introduction of the Seasonal Component AutoRegressive (SCAR) modeling framework has changed this viewpoint. However, this framework is based on linear models estimated using ordinary least squares. This paper shows that considering non-linear autoregressive (NARX) neural network-type models with the same inputs as the corresponding SCAR-type models can lead to yet better performances. While individual Seasonal Component Artificial Neural Network (SCANN) models are generally worse than the corresponding SCAR-type structures, we provide empirical evidence that committee machines of SCANN networks can outperform the latter significantly.     

高速公路沥青砼铣刨料在预防性养护中的应用

在公路日常养护中如何提高资源利用效率,降低养护成本,减少环境污染,进而使公路养护与自然环境相和谐,是公路预防性养护中所探索的目标和方向。本文重点阐述了如何利用高速公路养护维修作业中铣刨的废旧沥青混合料,对低等级公路的路面病害进行预防性处治的相关技术措施。     

导向磨铣工具在修井中的应用

针对目前小通道套损井找通道困难的实际情况,使用在用原有的磨铣工具,如磨鞋、铣锥的基础上,用现成捞矛杆加工成一定长度的导向杆,或使用钻杆加工成笔尖后制成。根据套损实际情况,导向杆下端部可以加工成椭圆形、平面式或笔尖形状,可以堆焊合金或不焊合金。进行套管修复作业时,先用导向杆引入到原井眼套管内对破损套管进行初期扩径修整,然后下入较大直径常规扩径磨铣工具进行扩径,最后下入密封加固管修复。由于导向杆的引导和扶正作用,阻止了磨鞋、铣锥偏磨,解决了磨损套管现象,现场应用效果显著。     

应用于螺旋锥齿轮全自动研齿装备的控制研究

基于对国内外螺旋锥齿轮研磨技术的研究,文章探讨了V/H研齿运动模型在中大创远螺旋锥齿轮全自动研齿机YK2560控制软件上的具体实现过程,包括全齿面研齿的运动轨迹控制技术、研齿效果控制技术、齿轮侧隙的自动检测与补偿技术,齿轮副综合跳动误差及齿轮副成员的跳动误差自动检测技术,磕碰与毛刺的自动检测技术等。     

双线螺纹带轮套的加工对车工高级人才培养的探析

双线螺纹加工方法较多,用数控机床加工相对简单,普通车床加工双线螺纹也比较普遍,这不仅可以锻炼机加工者的水平也是高级车工必备的技能,是一项难度大的加工工艺。以C6140型普通车床为加工设备,对带有双线螺纹带轮套的加工方法做一详细的分析,通过对双线螺纹带轮的加工分析,可以充分发挥此项加工项目在普通车工高级人才培养中的作用,对当今社会极需的高级车工人才培养具有一定的帮助。     

浮选机械设备的自动化技术

浮选设备自动化主要是对矿浆液面实现自动化控制,主要包括:浮选机液体传感器、液面自动控制系统、射流浮选柱的检测与控制系统、微泡浮选柱计算机监控系统和泡沫数字图像控制等。