查询词典 threshold

The method based on improved optimal weighted entropic threshold is implemented using PSO. Optimum parameters suitable for this algorithm based on improved PSO are given.

将PSO用于基于改进的最佳加权熵阈值法的图像分割中，试验结果表明，该方法不仅能够避免陷入局部极值，而且其速度得到了明显的改善，是一种有效的图像分割新方法。

In this thesis, the theories and methods of GA are analyzed in detail , the trend of GA in recent times is briefly discussed. Because of the importance of image segmentation, two methods of color image segmentation based on GA are proposed. One is the surface of thresholds image segment method, the other is entropic threshold method. Two algorithms are realized through VC++ 6.0. After that, we compare the characteristics of two algorithms and prove that GA can be very well applied to solving image optimal problems.

本篇论文比较详细地论述了遗传算法的基本理论、方法，指出了算法的研究现状，由于图象分割的重要性，提出了两种基于遗传算法的彩色图象分割方法，即阈值曲面分割方法和最佳熵阈值分割方法，通过VC++6.0编程得到了实验验证，比较了两种算法的性能，证明遗传算法完全适用于图象的优化问题。

It needs us to deal with the relationship of the WT and environment protection correctly, to define the threshold population of WT, to forecast environmental capacity of WT. For the sake of protection, the exploitations would do no harm to wetland environment.

这就要求我们正确处理湿地旅游发展和环境保护的关系，确定湿地旅游的门槛人口，预测湿地旅游环境容量，在开发和保护并重的基础上，不对湿地环境构成危害。

According to the statistics formula between the ratio of capillary pressure to threshold pressure and the effective wetting-phase saturation established by Brooks R.H.

根据Brooks R H和Corey A T建立的毛管压力同阈压之比与有效湿相饱和度S_之间的统计公式提出一种计算平均毛管压力曲线的方法。

Its core is to reduce the purchase tax to lower the threshold buyers.

其核心是减轻购房税费，降低购房门槛。

Even bellow the energy threshold for positronium formation, the laser can supply the extra energy to form a Ps atom.

对于激光辅助正电子对原子的重排反应，电子偶素的形成伴随着多光子过程发生，即使入射能量低于Ps形成阈值，辐射场可提供额外的能量形成电子偶素。

A hierarchical IDbased proactive threshold signature scheme is presented. The scheme has the structure of hierarchical PKGs, so a lowerlevel PKG can share the workload of secret information generation and identity authentication with a higherlevel PKG. At the same time the scheme has the property of proactive security, that is, the whole lifetime of signature is divided into several time periods, and the shares of private key need to be renewed in each time period.

方案具有分层的PKG结构，低层PKG可以分担高层PKG的秘密信息产生和身份认证的任务；同时具有动态安全的特性，将签名的整个生命周期分成若干时间段，每个时间段都对密钥份额进行更新，更新后的份额重构的密钥保持不变。

Materials and Methods Helical CT was performed with 3.0mm slice thickness and 1.0～1.2 pitch in 10 normal subjects and 36 patients with upper airway diseases. In the healthy group, the upper airway shaded surface display was processed by using different reconstruction interval (1.0～3.0mm) and upper threshold (0～-900HU), while in the patient group, SSD, RaySum and integrated 3D images were made respectively.

材料与方法对10例正常和36例上气道病变的患者进行轴位螺旋CT扫描，层厚3.0mm，正常组采用不同重建间隔、阈值作气道表面遮盖法重建，病变组分别作气道SSD、RaySum重建和叠加成像。

The extension was to be as open as possible so that when one crosses the threshold between the original and new structures they felt as though they were entering a covered deck rather than additional internalised space.

扩建的部分则是尽可能的外向，从老住宅到扩建部分的时候会感到是到了一个开放的平台。

It is shown that PTDT is a robust and valid approach for mapping QTL of threshold traits. Moreover, PTDT is powerful for marker with multiple alleles and multiple tightly linked markers, too. From the results of simulation on quantitative traits, following conclusions can be derived.

结果表明：(1)PTDT是一个稳健的QTL定位分析方法，在各种参数组合下，其假阳性概率(1型错误)都在设定的显著性水平附近；(2)PTDT不仅可以检测到效应较大的QTL，而且对效应较小的QTL检验功效依然很高；(3)对各种状态1发生率的阈性状PTDT检验功效也很高；(4)对利用多等位基因标记、多个紧密连锁的标记的QTL定位，PTDT依然是一个高效方法。

Although translator has turned from being a crystal ball by which the original culture can unrestrainedly penetrate to another crystal ball by which the target culture can freely traverse, the translator's personal embodiment, in the process of cognitive act, are still absent in translation studies. Translators are still subjects without body or simply disembodied subjects.

译者虽然由原语文化可以自由穿透的玻璃球变成了译语文化可以自由穿越的玻璃球，但译者认知过程中的个体体验在翻译研究中依然缺席，译者依然仅仅是一个没有躯体体验的主体。

Chillingly, he claimed our technology is 'not nearly as sophisticated' as theirs and "had they been hostile", he warned 'we would be been gone by now'.

令人毛骨悚然的，他声称我们的技术是'并不那么复杂，像他们一样，和"如果他们敌意"，他警告说，'我们将现在已经过去了。