查询词典 data mining

Among used machine learning methods, the gradient descent method is widely used to train various classifiers, such as Back-propagation neural network and linear text classifier. However, the gradient descent method is easily trapped into a local minimum and slowly converges. Thus, this study presents a gradient forecasting search method based on prediction methods to enhance the performance of the gradient descent method in order to develop a more efficient and precise machine learning method for Web mining.However, a prediction method with few sample data items and precise forecasting ability is a key issue to the gradient forecasting search method. Applying statistic-based prediction methods to implement GFSM is unsuitable because they require a large number of data items to model a prediction model. In the contrast with statistic-based prediction methods, GM(1,1) grey prediction model does not need a large number of data items to build a prediction model, and it has low computational load. However, the original GM(1,1) grey prediction model uses a mathematical hypothesis and approximation to transform a continuous differential equation into a discrete difference equation in order to model a forecasting model.

其中梯度法是一个最常被使用来实现机器学习的方法之一，然而梯度法具有学习速度慢以及容易陷入局部最佳解的缺点，因此，本研究提出一个梯度预测搜寻法则(gradient forecasting search method， GFSM)来改善传统梯度法的缺点，用来提升一些以梯度学习法则为基础的分类器在资讯探勘上的效率与正确性；而一个所需资料量少、计算复杂度低且精确的预测模型是梯度预测搜寻法能否有效进行最佳解搜寻之关键因素，传统统计为基础之预测方法的缺点是需要较大量的数据进行预测，因此计算复杂度高，灰色预测模型具有建模资料少且计算复杂度低等优点，然而灰色预测理论以连续之微分方程式为基础，并且透过一些数学上的假设与近似，将连续之微分方程式转换成离散之差分方程式来对离散型资料进行建模及预测，这样的作法不尽合理，且缺乏数学理论上的完备性，因为在转换过程中已经造成建模上的误差，且建模过程仅考虑相邻的两个资料点关系，无法正确反应数列未来的变化趋势。

The contributions are listed as follows:(1) a single-pass closed frequent itemsets mining process based on reverse lexicographic order FP-tree is introduced for mining classification association rules, which uses a kind of mixed item-ordering searching policy to satisfy the single-pass requirement of data streams and uses the bitmap technology to improve the efficiency;(2) the concept of self-support for filtering rules is proposed to improve the precision.

主要贡献在于：1提出了一种基于逆文法顺序FP-Tree的频繁闭项集单遍挖掘过程，用于挖掘类关联规则，该过程采用了一种混合项顺序搜索策略以满足数据流挖掘的单遍性需求，并采用位图技术提高效率：2提出了"自支持度"概念，用于筛选规则以提高算法分类精度。

Based on User Session File, which is the result of the preprocessing phase of Web Log Mining, this paper presents a Web Log Mining method for the recognition of user's browse patterns under the Extended Oriented-Tree model. Further more, the method is implemented basically in our lab and tested using real web log data.

本文从Web日志挖掘过程预处理阶段的结果用户会话文件开始，提出了一种基于扩展有向树模型进行用户浏览模式识别的Web日志挖掘方法，并在实验室对该方法进行了简单实现和实际日志数据的测试。

Firstly, the stope vacancy was monitored using CMS, taking cavity measured data as foundation, cavity three-dimensional model of the stope opening was created using Surpac software and gain the stope three-dimensional configuration and the actual boundary accurately. Then, the stope designed model and ore-rock interface digital terrain model were established according to the stope design material. Finally, using ore-rock interface DTM to cut cavity model or through Boolean calculation among the models, ore remains, mining total volume, mullock, backfilling, pure ore and dilution rate of stope N3-4 were calculated accurately, thus the large-scale stope mining index visible calculation was realized effectively.

采用CMS探测三维采场空区，以空区实测数据为基础运用Surpac构建采空区三维可视化模型，获取采场空区的三维形态和实际边界；运用采场设计资料，建立采场回采设计模型及矿岩边界模型，通过模型间的布尔运算，计算出采场存留矿量、回采总体积、采下废石量、采下充填体量、采下纯矿石量、回采总量及回采贫化率等，从而有效地实现了大规模采场回采指标的可视化计算。

According to the fifth census data: the region's total population 235,387, of which the township population: the victory of the village of Bridge Street 21129 100 Street Railway compound 24,812 of 21,470 street 33,084 Lin Pang Village Road street street street 2672 8683 16024 petrochemical 46196 street Zhai Xiang Peng 8350 Handan Handan Mining 31,522 virtual streets of metallurgical and mining Authority Xing virtual streets in North China Metallurgical Construction Corporation 21913 virtual streets in 2204

根据第五次人口普查数据：全区总人口235387人，其中各乡镇人口：胜利桥街道 21129 百家村街道 24812 铁路大院街道 21470 化林路街道 33084 庞村街道 8683 二六七二街道 16024 石化街道 8350 彭家寨乡 46196 邯郸矿务局虚拟街道 31522 邯邢冶金矿山管理局虚拟街道 21913 华北冶金建设公司虚拟街道 2204

Based on the charge transaction data of ETC system, this paper analyzed the original data and determined the data processing flow of ETC Data. Then, it proposed the travel speed calculation model of freeway, the traffic flow distribution analysis method, the information mining techniques of OD distribution, vehicle type proportion in different toll gate, and so on.

本文以电子不停车收费的交易数据为基础，通过对原始交易数据的分析，确定了数据的处理流程，在此基础上，提出了路段行程速度计算模型，交通流量分布规律分析方法和高速公路站点OD分布、车型比例分布等指标获取方法。

During the updating and mining of TCIS-Tree several optimal strategies, such as data filtering, heuristically and dynamically adjusting the pruning threshold and mining threshold, and so on, have been explored to make our method efficient.

在TCIS-Tree的更新和挖掘过程中，采用数据过滤、启发式动态调整剪枝阈值、挖掘阈值等若干优化措施，有效地提高算法的时空效率。

Then checking up mining practice, analyzing the observation and prediction data of dripping water amount and effusing water amount throughout mining. It is obvious from the research that the definitive width of waterproof pillar

研究结果表明，所确定的防水煤柱宽度满足开采要求，经济合理；同时，所采用的几种研究方法分析结果基本吻合，说明运用上述方法进行安全防水煤柱宽度的合理留设具有较强的可靠性，对类似矿山有一定的参考价值。

This paper combining with drilled data of coal mine, design the application of mixed data modelling system which is fit for the mining geology spatial data to be expressed. Provide the idea that the general process of geological modelling and the visualization processes of typical construction.

本文结合煤矿钻探数据，设计了适用于地质矿山三维可视化空间数据表示的混合数据模型系统，研究了地质体三维可视化建模的一般流程和典型构造建模的处理方法。

Thirdly, it analyzes and studies in detail Surpac mechanism and the relevant concepts on constructing the model of mineral deposits and mining engineering systems according to the modeling procedure and the actual conditions of Jinchuan"s mines. Based on these:Lit points out some differences between the western countries and China in the practice of the geological data record, explores the inputting data on computers performed by more people at the same time and the method to improve constructing the data-base and finished the data-base of Jinchuan mineral deposits;2.It puts forward the steps and flow chart to construct the solid model and brings forward the scheme of "first individual then whole to set up Jinchuan mineral deposits geological model, summarizes some experiences for constructing the complicated geological ore body of the high accuracy: add control lines, add auxiliary demarcation lines +control lines, the operation of intersection, cross and incorporation between solid bodies and plane and section combination. The above-mentioned methods applied to construct the mineral deposits solid models of four mine areas in Jinchuan; 3.lt studies and presents the detailed flow chart of constructing block and grade model, analyses the workable scheme in setting up the block and grade model of main ore body for Jinchuan mineral deposits and also sets it up.

接着，按建模流程并结合公司矿山实情，详细研究、分析了Surpac构造矿床模型和采矿工程系统模型的机理、有关概念，在此基础上：(1)指出了西方国家与我国在地质数据记录习惯方面存在的一些差异，探索出多人多机同时录入、提高建库效率的方法，建立了金川矿床地质数据库；(2)研究并提出了构造实体模型的步骤和流程图及&先分后整&建立金川矿床地质体实体模型方案，总结出建立高精度复杂地质体模型几点经验：添加控制线法、添加辅助分界线+控制线法、实体间的交、叉、并运算法及平剖面图联合法，建立了金川矿床四个矿区主矿体的实体模型；(3)研究并提出了建立块模型、品位模型详细流程图，分析了建立金川矿床主矿体块模型和品位模型的可行方案，建立了金川矿床主矿体的块模型和品位模型。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。