Study solving computer algebra problem method in engineering calculate 解決工程中計(jì)算機(jī)代數(shù)問題方法的探討
Project problem method 設(shè)計(jì)問題法
An inverse problem method is employed to determine the average magnitude of acid pollutants in groundwater in fengshui , zibo , shandong 摘要應(yīng)用反問題方法探討山東淄博市張店區(qū)灃水南部區(qū)域地下水中硫酸鹽的年入滲強(qiáng)度的數(shù)值反演問題。
Such methods are generally decreasing method , such as , feasible direction methods , constrained variable metric methods , etc . another class is sub - problems method , which approximates the optimal solution by solving a series of simple sub - problems , such as penalty function methods , trust region methods , and successive quadratic programming sub - problems , etc . the same property of two classes of methods is that they determine whether the next iterative point is " good " or " bad " by comparing the objective function value or merit function value at the current point and next iterative point 另一類叫做子問題算法,這種算法是通過一系列簡單子問題的解來逼近原問題的最優(yōu)解,如罰函數(shù)法、信賴域算法、逐步二次規(guī)劃算法等。這兩類算法的一個(gè)共同特點(diǎn)是,通過比較當(dāng)前點(diǎn)和下一個(gè)迭代點(diǎn)的目標(biāo)函數(shù)值或評(píng)價(jià)函數(shù)值來確定迭代點(diǎn)的“優(yōu)”或“劣” ,若迭代點(diǎn)比當(dāng)前點(diǎn)“優(yōu)”則該迭代點(diǎn)可以被接受,否則須繼續(xù)搜索或調(diào)整子問題。
At present , the research on the retroactivity of criminal law , the field of domestic theory concentrating on more concretes problem in the administration of justice , judging the case as it stands , seldom probe into the criminal law value behind the retroactivity of criminal law , has made the trouble of attending trifles and neglecting essentials , and not solve the problem method from macroscopic 目前,國內(nèi)理論界在關(guān)于刑法的溯及力問題的研究中,多集中于司法中的具體問題,就事論事,很少探究溯及力問題背后的刑法價(jià)值取向,犯了舍本逐末的毛病,沒有從宏觀上探求解決溯及力問題的方法。