a new device structure of polysilicon thin film transistor, halo ldd p-si tft, has been proposed. the halo structure device can restrain the sce effectively, and improve the device performance greatly with good doping distribution in the halo region. in this paper, influence of halo process parameter on device performance is researched and optimized with tsuprem4 and medici. it is found that higher tilt angle, energy and dosage gives increased threshold voltage and ration of ion to ioff, and also reduced leakage current and threshold voltage shift, but reduce drive current.
该文提出了多晶硅薄膜晶体管的一种halo ldd新结构，halo ldd结构能够有效地抑制短沟道效应，合理的halo区掺杂分布会极大地改善小尺寸器件性能。文中采用工艺模拟软件tsuprem4和器件模拟软件medici研究模拟了halo结构的工艺参数对器件性能的影响，并进行优化。
The modeling results show that, with proper choice of tuning gate material, this device design can increase the ON - OFF current ratio by 6-9 orders of magnitude, tune the threshold region effectively and keep the sub-threshold slope immune from it. What's more important is that the quasi-ambipolar transport characteristic of MOS-like CNFETs can be suppressed effectively using such novel device design.
模拟结果表明，通过合理选取调节电极材料，在不影响器件亚阈值斜率的同时，该设计方法能增大开关电流比6-9个数量级、调节亚阈值范围，更为重要的是能有效消除传统类MOS碳纳米管场效应管的双极性传输特性。
Because of the threshold of the wavelet coefficients and the property that FAB diffusivity acts as local forward diffusion in the small gradient region, the image is denoised as well as enlarged, and as local backward diffusion in the large gradient region the zoomed image is edge preserved.
由于小波系数阈值和该扩散方程在图像梯度小的区域具有正扩散性，使得放大图像的同时去除了噪声，该扩散方程在梯度大的区域具有逆扩散性，又有效地保持了边缘。
In this paper, two methods are proposed to enhance the difference detector: enlarging the image gradient by using local image variance normalization preprocessing, and adjusting the gradient by setting sigmoid function to transfer some region information to image gradient. Accordingly, the appropriate threshold can be set for fuzzy edge detection.
针对这一点，本文提出了两种解决的方法：将图像方差标准化，拉大棋糊边缘处的梯度值，或者通过设置sigmoid函数，将像素点所在区域的信息传递到梯度值中去，对梯度值进行调整，这样就能够设定合适的阈值，有效地将模糊边缘提取出来。
The main work is listed as follows. Firstly the weighted mean approach is used to transform color image into gray image, and gauss filter is applied to remove the image noise. An image segmentation approach based on threshold is adopted and a segmentation approach using Otsu method combined with seed filling algorithm is proposed based on character of somatic cell image and the existed cell segmentation approaches. An improved segmentation approach based on image fusion method is adopted to fuse the edge information image and the segmented image, which may obtain segmented cells with smooth and circular edge information. Because of some factors affect accurate counting, the morphology method is applied to complete post-processing and the binary image with the single cell as a connect region is obtained finally.
首先将彩色图像通过加权平均法转化为灰度图像；然后采用高斯滤波去除噪声；分析现存的细胞图像分割方法，结合牛乳体细胞图像特征，采用Otsu方法与种子填充相结合的分割方法和基于阈值的分割方法；对于细胞核有分叶的图像，采用了基于图像融合技术的分割算法，该方法对边缘图像和分割后的图像进行融合，可获得边缘信息较好的分叶核细胞图像；针对一些影响准确计数的因素，采用形态学方法做后处理，最终得到以单个细胞为单连通域的二值图像。
However, there are some undesired effects in conventional scaled-down poly-Si TFTs such as threshold voltage roll-off, drain-induced barrier lowering, and kink effect which are caused from the grain boundary defects and the floating body in channel region.
然而当传统复晶矽薄膜电晶体的尺寸缩小时，由於在通道中的晶界缺陷和薄膜电晶体的浮体结构，元件会发生一些非理想的效应，像是临界电压下降、汲极诱导能障下降和纽结效应。
In terms of spatial structure evolution, the study determined the scale of urban land by statistical analysis in Jilin on three periods scale-division(1980, 1997, 2001 year).The threshold of urban scale divided into 8, 20, 80, 120 sq km, combined with urbanization and development of Jilin province, we can analyse the changes of urban scale. By contrast, urban land scale division can reflect more information then non-agriculture population scale division in Jilin province; It can be found that the distribution center move slowly toward Changchun City, by calcuting the distribution center in the year 1994, 1999, 2995 and 2008 with weighted by non-agriculture population. Fractal dimension of urban in whole province can be estimated by the relationship of order-scale rule and fractal dimension. By the examples of 1980, 1997 and 2001, the results showed that fractal dimension was with slowly increasing trend, but with lower the overall number and low complexity; By calculating urbanization intensity index of 45 cities in Jilin province in 1980 and 1997, the results showed that the central region of urbanization intensity index was more than the eastern, western.
在规模结构演化分析中，对吉林省三期(1980年、1997年、2001年)城市用地的规模划分的基础上，通过统计分析确定吉林省城市用地规模划分的阈值分为8、20、80、120平方千米，通过阈值并结合吉林省城镇化发展的情况对吉林省城镇体系规模等级结构的演变进行分析，得出城市用地规模划分法比非农人口划分法更能反映中小城市的规模等级变化；计算1994年、1999年、2005年与2008年的数据非农人口为权重的省域分布中心，研究表明吉林省城市分布中心向长春市缓慢的移动；通过城市用地位序-规模法则与分形维数的关系计算吉林省1980年、1997年、2001年三期城市用地规模分维数，结果表明城市规模分布维数处于缓慢增加的趋势，但整体分维数较低，复杂度不高；通过计算吉林省1980年代与1997年代的地形图中45个城市用地数据扩展的强度指数，结果表明中部地区的城市扩展强度要比东部、西部要强。
A detection method of double-threshold constant false alarm movement object on double-base synthetic aperture radar includes finalizing distance compression of various pulse-sampling, dividing orientation time to be multiple CPI, carrying out FFT in each CPI to enter orientation frequency domain, comparing data amplitude of frequency channel at external of clutter region with the first threshold and outputting point trace, making coagulation on point trace, making Hough transform in point trace domain and making decision of the second threshold.
本发明涉及一种用于双基地合成孔径雷达的双门限恒虚警运动目标检测方法，其特征在于：1对每个脉冲采样完成距离压缩；2把方位时间分割成多个相干处理间隔；3在每个CPI内做快速傅立叶变换进入方位频域；4把杂波区外的频率通道的数据幅度和第一门限比较做判决并输出点迹；5点迹凝聚；6在点迹域做Hough变换并做第二门限判决。
The initial threshold was set according to the error on the first loaction of macting region. If the error was lower than the current value, the threshold would be updated, otherwise calculation must be stopped, which can eliminate the calculation on non matching points.
得到投影序列后，选定初始阈值，在后续各点的计算中不断自适应更新，遵循超过当前阈值即停止匹配计算的原则，大大减少了对非匹配点的计算。
The threshold switching surface are fallen into two types: unilateral and bilateral, and the notion of analysis region is provided to facilitate partitioning.
分析区域概念的提出，不仅可以将难以划分的无限区域和切换面变成有限的，而且减少了分析的范围。
It is observed that the threshold voltage, gain factor and current in linear and saturation region mismatch linear depend on the inverse of the square root of the device area.
由已经获得的经验知道，线性区和饱和区的阈值电压、增益及电流等参数的不匹配性均与器件面积的平方根成反比。
Firstly, the minimum interclass variance method was improved to obtain the optimal segmentation threshold of difference image quickly, and then, the region growing method was used to segment the target.
首先对最小类内方差法进行改进，快速确定差分图像的最佳分割阈值，再用区域生长法分割得到目标。
On the basis of four improved aspects, LUNF code is modified to calculate the total outgoing neutron double-differential cross sections from the threshold energy to 30 MeV. The calculated results agree fairly well with the experimental measurements. The analysis of the total energy angular spectra shows that the elastic channel and the inelastic channels of the 1st and 2nd excited levels largely con tribute to the first three peaks, the third excited level of inelastic channel and channel commonly to the 4th peak of the total spectra at high outgoing energy region.
第一，把入射能量提高到30MeV，以供核工程的需要；第二，在n＋~(12)C反应过程中，对靶核和各反应道剩余核能级纲图进行了更新；第三，在更新的能级纲图基础上，得到了一套新的中子及带电粒子的光学模型势参数；最后，重新对各个反应道进行了分析，并在此基础上，利用改进的LUNF程序，得到了出射总中子双微分截面，并很好地符合实验数据。
After the background segmentation to mammogram, it firstly makes the pick-up of the mammary region by using the improved area extension, and then uses the method of improved unsharp masking for image enhancement in the pick-up of the mammary region. It highlights the region of calcification points, and picks up the region of interest which may contain calcification based on the characteristics of calcification and a suitable threshold.
在对乳腺X射线图像进行基本的背景分割后，首先运用改进的区域扩张法实现了对乳腺图像中乳腺区域的提取，然后对乳腺区域部分采用改进的反锐化掩模法进行图像增强，突出钙化点区域，再根据含钙化点的特征选取合适的阈值提取出可能含有钙化点的感兴趣区域。
The main contents in this thesis include the following three aspects: the study of reference circuit model based on sub-threshold MOSFETs, the design of reference circuit based on MOSFETs operating in sub-threshold region and the correction of process divagation for reference circuit based on sub-threshold MOSFETs, respectively.
本论文的研究工作主要是包括三个方面的内容，即亚阈值MOSFET基准电路模型的研究、亚阈值MOSFET基准电路的设计和亚阈值MOSFET基准电路的误差修正。
A 3D safe region is introduced for each non-geometric primitive, substituting the old inefficient distance threshold, to enable a higher accuracy in the judgment of primitives'activity in the camera view cone.
提出了基元安全区域的概念，用它来判断景物相对于相机的可视程度，取代不够精确的距离阈值判断法，使混合绘制对景物基元的激活、类型切换的控制和视觉连续性的处理更加精确。
HHHH? HHHHm region possess advantages of small divergence angle, low threshold current, high frequency response, the ability to integrate with other electronics and low cost.
操作在1300nm和1550nm的面射型雷射其发散角小、低临界电流、操作频率快、整合能力高，在光纤通讯的应用上极具低成本发光源的潜力。
Through the experiment a mean8 based on fusing muIti- band cOlOr image data tO find and lOcate the leukOcytes is propOsed; at the same time a sequel segment algOrithm cOmbining threshOld technique and regiOn growing technique is presented fOr true cOlOr leukOcyte imagc.
通过实验分析，提出了融合多光谱彩色图象信息的白细胞检出方法，以及综合了递归阈值分割技术与合区域增长技术的白细胞序贯分割方法。
The mechanisms of oxide induced crack closure and crack tip oxidation brittlement are responsible for lower crack propagation rate in Paris region at 923K and higher threshold level at 1123K respectively, and this temperature effect does not vary with orientation, loading mode and γ'precipitates morphology.
氧化物诱发裂纹闭合和裂尖氧化致脆机制，分别使923K和1123K具有较低的Paris区扩展速率和较高的门槛水平，这种温度效应不随取向、加载模式和γ'形态而改变。
This paper reviews some of existed techniques, such as threshold、region growing and edge detection.
本文回顾和总结了一些存在的图象分割方法。