Then the gray image is transformed into a binary image through a one - by - one - point section - threshold binary algorithm . after that , a postprocessing is implemented on the given binary image . in the part of thinning algorithm , an improved thinning algorithm derived from the opta is introduced in , for the purpose of producing high quality skeleton of fingerprints , on which the more accurate fingerprint feature location and type are based 采用离散方向法来求取指纹的点方向图，进而用直方图法结合动态分块得到指纹的块方向图；再对指纹图像进行方向法滤波；然后使用逐点局部阈值法，对指纹图像进行二值化处理；二值化后对二值图进行后处理；细化算法采用基于opta的改进细化算法，可以获得高质量的指纹骨架。
At last , a design example problem of column - gear speed reducer is made . contraposing design character of gear driver , attain the solution of mathematic model of robust optimal design and compared to that of common optimal design . the results show that the gear driver by robust optimal design is higher power to resist disturb and good quality stability and high reliability 为了证明随机模拟试验的稳健优化设计方法的正确性、可靠性和实用性，本文以某二级圆柱齿轮减速器为设计实例，针对齿轮传动的设计特点，运用随机约束方向法对稳健优化设计数学模型进行求解，并将一般优化设计结果与稳健优化设计结果进行比较、分析，结果表明稳健优化设计得出的齿轮传动系统抗干扰能力强，质量稳定性好、可靠性高。
So it is an important research in the field of the electronic technology to reduce the loss caused by the switching device and to improve the efficiency of high frequency power converters . this paper primarily focuses on the optimization of the mosfet parasitic capacitance so as to reduce the switching loss and improve the efficiency of power transforming in converters using mosfet as switch 通过分析mosfet器件的开关特性，根据输出电容c _ ( oss )给器件引进的动态损耗来确定优化器件输出电容西安理工大学硕士学位论文l变化曲线的目标函数，运用可行方向法求解带约束条件的最优值，确定出优化的输出电容人变化曲线。
In this paper , a dynamic model is established to aim at the improvement of power train mounts for a light truck . by using the fuzzy multiple targets optimization design methodology , the decoupling reactive force is set up to be the target on the basis of artificial judgement , dsfd also is applied for the design optimization 本文针对某轻型卡车总成悬置系统,建立了悬置系统的动力学模型,采用模糊多目标优化的方法,在人工决断的基础上考虑解耦动反力(矩)等综合性能为设计目标,运用转轴直接搜索可行方向法( dsfd )优化算法对系统进行了优化设计。
At present , constrained optimization methods may be classified to two classes , one is search method which firstly asserts whether the current point is an optimal point , if the point is not , then we must choose search directions , and along the search direction , find the next iterative point which make the objective function or merit function to decrease 目前的约束优化算法可以分成两大类，一类是搜索算法，这种算法首先判断当前点是否为最优点，若非最优点则要确定搜索方向，然后沿此方向确定一个使目标函数或评价函数下降的点。这种算法一般为下降算法，如可行方向法、约束变尺度法等。
Mathematical model of structural optimization has been set according to the data got from dynamic analysis . the thickness of plates , diameter and thickness of tubes , elastic and damp coefficient of front and back vibration absorber have been optimized in modified feasible direction method . contrast with original motorcycle has been successively done 根据动态分析得出的数据,建立结构优化的数学模型,使用改进的可行方向法,对车架和整车的板厚、管径及其壁厚、前后减振器的弹性系数和阻尼系数等进行寻优。
Chapter 1 , making use of the technique of pivoting operation , the technique of sequential systems of linear equations of studying constrained optimization problems and the idea of strongly subfeasible directions method and , several new algorithms for systems of nonlinear inequalities are presented 第一章，借助于转轴运算技术，序列线性方程组技术以及强次可行方向法思想，建立了非线性不等式组的序列线性方程组算法，算法的搜索方向由有唯一解的线性方程组的解及其校正产生。
It includes four criterions of locating fault point ? “ transient zero sequence current amplitude law ” , “ stable base wave zero sequence current phase law ” , “ stable seventh harmonic zero sequence current phase law ” and “ s injection law ” . pointing out how the law locate the fault point to minimal fault section by applying these criterions gradually . the law will not only make up the blemishes existing in current methods for single - phase fault location in small current grounding system , but also locate the fault point to minimal fault isolating unit on fault line 该方法通过将所包含的四个定位判据- “暂态零序电流幅值法” 、 “稳态基波零序电流方向法” 、 “稳态7次谐波零序电流方向法”和“ s信号注入法” -进行有选择地递进使用,不仅有效弥补了目前已有小电流接地系统单相接地故障选线的缺陷,更将故障定位在故障线路最小故障区段。
The algorithm ' s ideal is benint from the ideal of generalize projection technique and strongly subfeasible direction algorithm . it can be approximately describe as follows : firstly , by the introductin of a perturbed parameter / / , replace the complementarity constraints with a generalized function , then ( mpec ) can be reformulated equivalently nonlinear constraints programs . secondly . combine the ideal of strongly subfeasible direction algorithm and generalized projction tech - nique , we setup a generalized strongly subfeasible direction algorithm 本学位论文结合广义投影技术和强次可行方向法思想，建立一个新算法，该算法的主要思想大致可描述如下：首先引入一个趋向于0的参数，用一个互补函数代替性质不好的互补约束，将问题等价的转化为一般的非线性约束最优化问题，然后结合广义投影技术和强次可行方向法思想，建立一个广义强次可行方向算法
Using method of sumt and powell , the thesis carries out optimization design for air rocket with double - push accelerated velocity and spin - rate regularity , which dramatically decreases air rocket dispersion . in the end , some valuable conclusions are achieved for application 综合利用双推力加速度，转速规律，同时采用内点罚函数法和powell共轭方向法，对航空火箭弹的主要参数进行优化设计，实现了大幅度减小航空火箭弹散布的目的，得到了一些有应用价值的结论。
