By the comparative study of some models , the naive bayes model and maximum entropy are better than other models in performance , especially the na ? ve bayes model , it is convenient over construction and realization , and machine learning process is brief and efficient 通过各个模型的比较研究,发现贝叶斯模型和最大熵模型性能比其它几个模型更为理想,尤其是贝叶斯模型,在构建和实现上比其它几个模型相对要简便易用,机器学习过程也简洁高效。
Some heuristics for the problems are present , and their performance guarantee is analyzed by the transform lemma . some present results are improved . in part three , the problem of scheduling n jobs on a single ' batching machine is addressed , and the jobs have release times and due dates 第三部分研究了单台批处理机器，工件的到达时间不同，以极小化最大延迟时间为目标的分批排序问题1 | r _ j , b | lmax ，论文提出了一些近似算法，给出该了问题相应的最差性能比界。
The algorithm has been simplified based on the actual engineering and has been implemented by the simplified form in this project finally . this has improved the voice compression . there are the input and output of the traffic module , the buffer designing , the thread of sending and receiving designing and the data communication in this dissertation 在业务模块的论述中,首先对ccitt的g . 726语音压缩标准算法进行了分析和研究,结合具体的工程实际对该标准算法进行了一定的简化和优化,并最终以该简化后的形式应用于本项目,使得简化后的算法性能比标准算法有了一定的提高。
3 . the performance of staggered joints is similar to ordinary joints ' , not only about the plump of hysteresis curves , energy dissipation , but also the time , the rapidity of shear resistance decrease and the degree of joints stiffness degradation . only the displacement ductility coefficient in staggered joints is little smaller than in ordinary joints 错层节点的抗震性能比普通节点的抗震性能基本差不多，不管是从梁端滞回曲线的饱满程度、耗能系数，还是从节点承载力降低的早晚、快慢、节点刚度退化的程度上来说，都是这样，唯有错层节点的位移延性系数，要比普通节点的稍差一些。
In this paper , we study an on - line version of the two - dimensional bin packing problem that is the problem of packing a list of rectangular items into a minimum number of unit - square bins in an on - line manner . an on - line algorithm called rtdh ( refined two dimensional harmonic ) is proposed and analyzed . we show that rtdh can achieve an asymptotic worst - case ratio of less than 2 . 7687 , which beats the best - known bound 2 . 85958 目前，对该问题的研究有各种算法，主要有harmonic和round算法，本文针对harmonic和round算法存在的问题，提出一种算法rtdh ( refinedtwodimensionalharmonic ) ，做了相应的分析，并且给出了该算法的最坏性能比是2 . 7687的证明，这个结果刷新了目前最好的结果2 . 85958 。
Furthermore , it was proved that either surface modification of ac by 30 % hno3 or introduction of the second cation could improve the performance of the adsorbents . in addition , the performance of cucl2 - la ( no3 ) 3 / ac ( modified by 30 % hno3 ) was improved after the first regeneration , then kept almost constant even after reused for five times 寿命实验表明， cucl _ 2 - la ( no _ 3 ) _ 3 /活性炭(硝酸氧化)吸附剂初次使用并经脱附后的吸附性能比新鲜吸附剂更好，而且再经5次使用，性能几乎不变。
According to the introduction of chen shi , the vice - president of chinese company of general motors , this mixing power bus will introuduce the drive system which researched by allison gearbox , in resent 2 years , there will be more 300 mixing power buses appeared on the america street 这次一汽客车展示的xq6110ch2型豪华公路客车是一汽客车最新研发的产品，具有国内领先水平，有数项技术申报了国家专利，极具市场销售潜力。 xq6120sh2低入口客车以其价格性能比，收到与会人员的瞩目。
When sintered at 1050c , the wear resistance of the composites were better than that of the ferroalloy under both low and heavy load without oil lubrication . the wear resistance , hardness , and other mechanical properties of the composites with nickel coated sic were better than those of the composites with bare sic particles . however , when sintered at 1100c , interfacial reaction became so acute that the properties of the composites with nickel coated sic particles was worse than those of the composites with bare sic particles 试验结果表明：与铁合金相比，在1050时烧结时，加入适量的sic后，耐磨性有较大的提高；而且加入镀镍sic的复合材料的耐磨性、硬度和拉伸强度等力学性能比加入相同含量的未镀sic的材料的性能要好；在1100烧结时，由于界面反应的加剧，含有镀镍sic材料的性能反而比含有未镀sic材料的性能差。
In chapter 3 we construct two approximation algorithms which applying bin packing algorithms for scheduling problems , one is ff ( first fit ) algorithm used in parallel machine scheduling problem pm / / dj = d / n which has a lower bound of asymptotic worst - case performance ratio , another problem is scheduling independent parallel tasks in parallel identical machine systems to minimize the makespan , we use strip packing method for it and give an approximation algorithm with asymptotic performance ratio no more than 1 . 6 第一个算法利用装箱问题中的ff ( firstfit )算法求解极大化按期完工工件数的平行机排序问题pm d _ j = d n - u _ j ，该近似算法具有渐近性能比下界。第二个近似算法利用二维装箱中strippacking问题的算法求解以极小化makespan为目标的带并行工件的平行机排序问题，该算法的渐近性能比具有下界1 . 5和上界1 . 6 。
