一种计算卷积码自由距离的快速算法

本文给出了一种计算卷积码自由距离的快速算法,该算法把遗传算法与模拟退火有机结合并根据随机概率来控制算法的运行,避免了优化迟钝与盲目现象,提出了该算法的收敛质量和速度,模拟结果表明：与已有算法相比,本算法具有更好可靠性,有效性和稳定性。     

任意导线在送电线路工程测量中的应用

根据导线理论,提出任意导线在送电线路工程困难区域内间接测量的理论和方法。     

汽车夜间会车合适变光距离的分析

本文以人的暗适应现象和车辆高速运行的基本规律为依据,对我国道路交通管理条例中所规定的“汽车夜间会车应距对方150米以外进行变光”的条文进行了工效学分析,指出了该项规定欠科学性的机理,并为制定新的法规条款指出了有关可操作的途径。     

明渠非恒定流的特征线解法

长距离输水明渠中,常遇到闸门启闭过程中,渠中水面波动比较剧烈,导致漫堤的情况,严重的可能会引起渠堤失稳滑坡.利用特征线法对描述明渠中水流运动状态的圣维南方程组进行求解,编制程序求解了简单输水模型中,闸门启闭情况下渠中各断面水深的变化情况,为分析复杂情况提供参考.     

Quantitative Structure-Property Relationship Research of Main Group Compounds

New appronches were applied to improve the molecular connectivity indices m^X^τ. The vertex valence is redefined and it was reasonable for hydrogen atom. The distances between vertices were used to propose novel connectivity topological indexes. The vertices and the distances in a molecular graph were taken into account in this definition. The linear regression was used to develop the structural property models. The results indicate that the novel connectivity topological indexes are useful model parameters for Quantitative Strncture-Property Relationship （ QSPR ） analysis.     

图象重建的最小距离算法

本文提出了图象重建的一种凸集投影算法.它的重建图象是所有满足投影约束的图象中与先验图象的距离最小者.该算法是就连续分布的图象导出的,重建图象时也不需在空域与频域间进行变换,是一种较OSPR方法更直接、更简单的方法.还对最小距离算法重建结果的存在性、唯一性、幂等性等性质作了证明.     

形态骨架匹配算法及其在交通标志识别中的应用

交通标志是人为的、具有特殊形状的符号，就其结构可分为外层轮廓和内核两部分。应用计算机视觉可以对交通标志进行自动识别．其关健在于如何检测交通标志和识别它们的内核形状。本文应用数学形态学方法研究交通标志内核形状的形态特征，分析了内核形状的形态骨架，提出和讨论了内核形态骨架的相关函数和距离函数，并就交通标志的有效识别提供了理论分析和实验结果。     

Optimization of weighting methods of smoothing the discreteness error of distance sensors based on a frequency rangefinder

We present a method for locally optimizing the parameters of an arbitrary weighting function used to smooth the error due to the discreteness of a distance sensor based on a frequency rangefinder. Then we analyze how additive noise affects the error of measurement and we derive an expression for the dispersion of the error. The possibility that optimization of the weighting function parameters can minimize the total error is examined.Translated from Izmeritelnaya Tekhnika, No. 12, pp. 19–23, December, 2004.This revised version was published online in April 2005 with a corrected cover date.     

网上电子交易中的谈判协商模型

本文讨论网上交易中买卖双方的谈判协商模型。详细研究了电子商务的谈判协商模型中的商品多属性量化模型和报价函数。提出了进行买卖双方商品需求匹配的距离函数,并讨论了一个为达到利益最大化而得到最佳报价的方法。     

"Development of Time, Speed, and Distance Concepts": Correction to Siegler and Richards.

Reports an error in the original article by Robert S. Siegler and D. Dean Richards (Developmental Psychology, 1979, Vol. 15[3], pp. 288-298). The column headings of Table 1 on p. 291 are incorrect. Each pair of lines in the column headings represents the starting points, stopping points, and total distance traveled by the trains. The corrected table appears below. (The following abstract of this article originally appeared in record 1979-28311-001.) Used the rule-assessment approach to examine understanding of the concepts of time, speed, and distance in 36 5-, 8-, and 11-yr-olds and 12 undergraduates. Parallel tasks were developed for the 3 concepts that allowed specification of whether Ss were relying on time, speed, distance, end point, end time, beginning point, or beginning time cues in making their judgments. It was found that 5-yr-olds understood all 3 concepts in the same way: Whichever train ended farther ahead on the tracks was said to have traveled for the longer time, at the faster speed, and for the greater distance. Undergraduates, at the other extreme, understood all 3 concepts as distinct and separate ideas. The transitional period was marked by specific confusions among the 3 concepts: Time was regularly confused with distance, distance was confused with time, and speed was confused with distance and to some extent with end point. Both speed and distance concepts appeared to be mastered well before the concept of time. (PsycINFO Database Record (c) 2010 APA, all rights reserved)