共查询到20条相似文献，搜索用时 93 毫秒
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本文通过对整数规划原理的分析,结合自身实际研究了一个由整数规划所描述的选课模型。利用计算机软件编程,给出了该整数规划的解,进而获得该模型的所有最优方案。 相似文献
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利用整数规划法建立选课策略模型。首先,考虑选课量最少而建立一种单目标约束整数规划模型;其次,既考虑选课量少又考虑学分多而建立一种多目标约束整数规划模型;最后,提出一种克隆选择算法对模型进行求解分析。该两类模型均属约束整数规划问题,已有的数学软件在求解该类问题时极难呈现出优越性,而智能优化算法具有较强的全局搜索和约束处理能力。故提出一种0／1编码的克隆选择算法,对所建立的模型分别进行仿真,所获结果表明,该算法能获得多组决策方案,较好的完成模型的求解。 相似文献
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李娜 《洛阳工业高等专科学校学报》2010,20(4)
针对售后服务逆向物流网络设计中的售后服务中心、综合维修中心、生产厂家的个数和地址设置,基于优化运输成本和维修费用,提出了一个混合整数规划模型,然后通过遗传算法建立了该模型的一种求解算法,最后给出算例表明了模型和算法的有效性. 相似文献
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利用运筹学中整数规划,0-1规划的思想,建立考试安排的数学模型,利用LINGO软件编程对该模型进行求解,并以石家庄铁路职业技术学院经济管理系为例,展示该模型的实际应用过程。 相似文献
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利用运筹学中整数规划,0—1规划的思想,建立考试安排的数学模型,利用LINGO软件编程对该模型进行求解,并以石家庄铁路职业技术学院经济管理系为例,展示该模型的实际应用过程。 相似文献
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针对非线性约束整数规划问题的特点,提出一种改进差分进化算法.将差分进化算法做了适当修正,在初始化和变异操作中加入取整运算,采用松弛可行基规则作为选择策略.实验研究结果表明.该算法能有效求解非线性约束整数规划问题. 相似文献
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对肠衣搭配问题进行分析,研究设计了肠衣搭配的优化方案.针对题中给出的成品捆数最大化要求,引入了0-1分配变量作为整数规划模型的决策变量,将目标函数确定为分配变量之和,建立了一个简单有效的0-1整数线性规划模型,通过LINGO软件求解得到每捆的搭配方案. 相似文献
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利用Floyd算法及就近原则,首先建立了以点集为管辖范围、以出警时间最短、工作量相对均衡、总工作量最小为目标函数的多目标0-1整数规划模型,然后将原网络图转化为对偶图,建立了以路集为管辖范围的多目标0-1整数规划模型.此外,在一个平台的警力最多封锁一个路口的前提下,设计了快速全面封锁的方案,得到了8.015min的最佳封锁时间. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献