POTENTIAL FOR INTENSITY-MODULATED RADIATION THERAPY TO PERMIT DOSE ESCALATION FOR CANINE NASAL CANCER

We evaluated the impact of inverse planned intensity-modulated radiation therapy (IMRT) on the dose-volume histograms (DVHs) and on the normal tissue complication probabilities (NTCPs) of brain and eyes in dogs with nasal tumors. Nine dogs with large, caudally located nasal tumors were planned using conventional techniques and inverse planned IMRT for a total prescribed dose of 52.5 Gy in 3.5 Gy fractions. The equivalent uniform dose for brain and eyes was calculated to estimate the normal tissue complication probability (NTCP) of these organs. The NTCP values as well as the DVHs were used to compare the treatment plans. The dose distribution in IMRT plans was more conformal than in conventional plans. The average dose delivered to one-third of the brain was 10 Gy lower with the IMRT plan compared with conventional planning. The mean partial brain volume receiving 43.6 Gy or more was reduced by 25.6% with IMRT. As a consequence, the NTCPs were also significantly lower in the IMRT plans. The mean NTCP of brain was two times lower and at least one eye could be saved in all patients planed with IMRT. Another possibility with IMRT is dose escalation in the target to improve tumor control while keeping the NTCPs at the same level as for conventional planning. Veterinary     

An ALgorithm of the Second Kind Fuzzy Reliability

Based on L.A.Zadeh's idea of fuzzy probability operation in his language probability which space is fuzzy probability,the concrete algorithm of the second kind fuzzy reliability of engineering structure/system is researched.The calculating equation of the fuzzy probabiliy of the second kind fuzzy reliability is given out by using the extension principle for fuzzy sets.The fuzzy set decompose theorem,which satesfies the closed probability operation,is given out and proved.The method calculating fuzzy reliability of that structure/system is studied,where the resistance and load effect of the structure/system have probability.The analysis indicates that the calculation of the second kind fuzzy reliability for a structure/system can be transformed into a series of solving optimum programming.The result of the example indicates the rationality of above algorithm.     

Interval Probability Random Variable and Its Numerical Characters

In this paper,based on the idea of fuzzy number origin,an interval probability space of the finite origin is established by the operation of fuzzy probability.Definitions of interval probability random variable (vecter) and it,s distribution function,distribution sequence,math expectation,variance and so on are given,and some special operation rules on them are studied.     

A PREDICTION OF THE DEVELOPMENT OF COMMODITY ECONOMY BY MEANS OF MARKOVIAN DECISION PROGRAMMING

This paper studies the transition prdbability, transfer matrix,distribution of owning the marketplace, and the transition probapility of theflow of customers by means of the theory of Markovian Decision Programming.It gives the theory and method for scientific predietion of the main probabilityof owning the marketplace and expected revenue in commodity economy.     

模糊概率在棉花品种综合评价中的应用初探

本文运用模糊数学中隶属度和模糊概率的概念及计算公式,提出了棉花品种综合评价的模糊概率值法,并说明了方法的原理和使用步骤。为了验证该法的有效性,综合评价了1984年黄河流域棉花品种区试的各参试品种。结果表明,模糊概率值法与文献[2]中的多级模糊综合评定法采用同一资料得出的结果完全一致,但本法比文献[2]大大简化了计     

Tendency Forecast of Three Gorge Land Using by Means of Markov

In order to grasp the trend of land-using structure transition, adjust social and economical development strategies, and optimize the land-using structure, the land structure in latest years is forecasted, based on the analysis of land using actually and the first-hand data of the year 1995~2001. The theory of Markov chain is used to construct the transition probability matrix. The character of land structure transition is analyzed. The result shows that the plough reduce rapidly,the land is not fully utilize and the traffic land increase slowly.     

利用动态规划法确定水库最优灌溉面积

利用动态规划法对供水水库进行长系列优化调度，建立了一维或多维并联供水水库优化调度数学模型，编制了通用计算机程序，通过点绘水库灌溉面积与供水保证率、灌溉面积与缺水率曲线，在给定灌溉保证率下通过查曲线即可确定水训最优灌溉面积。     

一种基于时间序列图像中的雾滴匹配方法的实现

在利用图像处理进行喷嘴雾化性能检测过程中,为了能够解决同一雾滴在相邻两幅图像中的自动匹配问题,提出了应用雾滴邻域匹配概率算法,实现了对不同时刻图像中的同一雾滴进行匹配的方法.实验结果表明:该方法实现了对同一雾滴在不同帧图像中的自动匹配,匹配速度快、正确率高.     

随机载荷作用下的曲轴工作可靠性分析

考虑到试件在实际工作中载荷循环特征的分散性对其疲劳寿命的影响,建立了一种以应力幅值和应力均值为基本随机变量的二维应力-强度干涉模型.讨论了该模型建立的原理,给出了干涉模型的几何示意图以及极限状态方程.应用该模型对S195型柴油机曲轴的失效概率进行了蒙特卡罗求解,其结果与实际统计的失效概率吻合较好.根据多种情况下的模拟数据,分析了曲轴强度均值及变异系数对其工作可靠性的影响.