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1.
半r-预不变凸函数是一类新的广义凸函数,它是r-预不变凸函数和半预不变凸函数的推广。本文对半r-预不变凸多目标规划问题的混合型对偶进行了研究。首先,给出了在可微的半r-预不变凸函数的一个性质;然后,利用半r-预不变凸函数建立了目标函数和约束函数均可微的多目标规划问题的混合型对偶,证明了目标函数和约束函数在半r-预不变凸函数条件下的弱对偶,强对偶和严格逆对偶定理;结论具有一般性,推广了涉及预不变凸函数、r-预不变凸函数和半预不变凸函数的文献的结论。  相似文献   

2.
G-不变凸函数是一类新的广义凸函数,是G-凸函数的推广。本文主要研究了一类带等式和不等式约束的目标函数带支撑函数的不可微多目标规划问题。首先,构造了该问题的Wolfe型对偶模型。其次,利用G-Karush-Kuhn-Tucker最优性必要条件,分别在G-不变凸和G-拉格朗日函数不变凸假设下证明了该问题及其对偶问题的弱对偶定理。最后,在适当条件下给出该问题及其对偶问题的强对偶和逆对偶定理及其证明。本文的结论更具一般性,将前人的相关结论推广到了非可微的情形。  相似文献   

3.
G-不变凸函数是一类新的广义凸函数,是G-凸函数的推广。本文主要研究了一类带等式和不等式约束的目标函数带支撑函数的不可微多目标规划问题。首先,构造了该问题的Wolfe型对偶模型。其次,利用G-Karush-Kuhn-Tucker最优性必要条件,分别在G-不变凸和G-拉格朗日函数不变凸假设下证明了该问题及其对偶问题的弱对偶定理。最后,在适当条件下给出该问题及其对偶问题的强对偶和逆对偶定理及其证明。本文的结论更具一般性,将前人的相关结论推广到了非可微的情形。
  相似文献   

4.
【目的】用更广义的凸函数来研究多目标规划问题。【方法】利用局部Lipschitz函数,定义了一类新的(G-V,ρ)不变凸函数,研究了涉及新定义函数的非可微半无限多目标规划问题。【结果】得到了Mond-Weir对偶问题的弱对偶条件和严格逆对偶条件。【结论】在新的凸性下推广了非可微多目标规划问题的对偶条件。  相似文献   

5.
B-(p,r)-不变凸规划的最优性条件及Wolfe型对偶   总被引:2,自引:0,他引:2  
B-(p,r)-不变凸函数是一类新的广义凸函数,它既是不变B-凸函数,又是(p,r)-不变凸函数的推广形式.首先,利用B-(p,r)-不变凸函数讨论了目标函数和约束函数均可微的多目标分式规划问题(FP),得到了目标函数和约束函数在B-(p,r)-不变凸函数限制下可行解为有效解的一个最优性充分条件;其次,利用B-(p,r)-不变凸函数建立了多目标分式规划问题(FP)的Wolfe型对偶,证明了目标函数和约束函数在B-(p,r)-不变凸函数限制下的弱对偶,强对偶和严格逆对偶定理.其结论具有一般性,推广了许多涉及不变凸,不变B-凸,(p,r)-不变凸和B-(p,r)-不变凸函数的文献的结论.  相似文献   

6.
B-(p,r)-预不变凸函数是一类新的广义凸函数,它是B-(p,r)-不变凸函数的推广.本文讨论了B-(p,r)-预不变凸函数的一些性质;然后利用B-(p,r)-预不变凸型函数建立了目标函数和约束函数均可微的多目标规划问题的Wolfe型对偶,证明了目标函数和约束函数在B-(p,r)-预不变凸型函数条件下的弱对偶,强对偶和严格逆对偶定理;最后给出了B-(p,r)-预不变凸函数在关于目标函数的极小化问题中的两个重要应用,即建立目标函数在B-(p,r)-预不变凸函数条件下的极小化问题(P),证明了它的局部最优解是全局最优解,它的解集是P-不变凸集,且得出如果问题(P)存在最优解,则最优解唯一.本文结论具有一般性,推广了涉及预不变凸函数、B-预不变凸函数和(p,r)-预不变凸函数文献的一些结论.  相似文献   

7.
20世纪60年代诞生的凸分析已成为数学规划、变分学、最优化理论等学科的重要基础,但实际问题中大量函数是非凸函数,因此对凸函数进行多种形式的推广,出现各种广义凸函数,目前许多学者已研究了各类广义凸性条件下各类优化问题的最优性条件、对偶理论等;对可微多目标规划问题的研究已相对成熟,对不可微多目标规划问题,在广义凸性下也得出一些结果.为研究有关局部Lipschitz函数的多目标分式规划问题,在广义Clarke梯度概念和非光滑(F,α,ρ,d)-凸函数的基础上给出广义非光滑(F,α,ρ,d)-凸函数的定义,在这些广义非光滑凸性的假设下得出一类不可微多目标分式规划问题的最优性条件.  相似文献   

8.
非光滑广义凸规划的Mond-Weir对偶定理   总被引:1,自引:0,他引:1  
把可微规划的Mond-Weir对偶推广到非光滑规划的广义Mond-Weir对偶,然后在广义η-严格伪凸函数,广义η-伪凸函数、广义η-拟凸函数和广义η-弱拟凸函数四类广义凸函数条件下,讨论了该非光滑规划的广义Mond-Weir对偶,得到了相应的弱对偶定理、直接对偶定理和严格逆对偶定理.  相似文献   

9.
B-(p,r)-预不变凸函数是一类新的广义凸函数,它是B-(p,r)-不变凸函数的推广。本文讨论了B-(p,r)预不变凸函数的一些性质;然后利用B-(p,r)预不变凸型函数建立了目标函数和约束函数均可微的多目标规划问题的G&019型对偶,证明了目标函数和约束函数在B-(p,r)预不变凸型函数条件下的弱对偶,强对偶和严格逆对偶定理;后给出了B-(p,r)预不变凸函数在关于目标函数的极小化问题中的两个重要应用,即建立目标函数在B-(p,r)预不变凸函数条件下的极小化问题(P),证明了它的局部最优解是全局最优解,它的解集是p-不变凸集,且得出如果问题(P)存在最优解,则最优解唯一。本文结论具有一般性,推广了涉及预不变凸函数、B-预不变凸函数和(p,r)-预不变凸函数文献的一些结论。
  相似文献   

10.
在局部Lipschitz函数,Clarke广义梯度和半(E,F)凸函数的基础上,定义了半(E,F)ρ-凸函数和拟半(E,F)ρ-凸函数等几类新的广义凸函数,并研究了涉及这类函数的一类多目标半无限规划的Mond-Weir型对偶问题,得到了若干弱对偶和强对偶定理.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

13.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

14.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

15.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

16.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

17.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

18.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

19.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

20.
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the  相似文献   

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