排序方式: 共有5条查询结果,搜索用时 296 毫秒
1
1.
A reactive tabu search algorithm for the vehicle routing problem with simultaneous pickups and deliveries 总被引:2,自引:1,他引:1
Niaz A. Wassan A. Hameed Wassan Gábor Nagy 《Journal of Combinatorial Optimization》2008,15(4):368-386
The vehicle routing problem with pickups and deliveries (VRPPD) extends the vehicle routing problem (VRP) by allowing customers
to both send and receive goods. The main difficulty of the problem is that the load of vehicles is fluctuating rather than
decreasing as in the VRP. We design a reactive tabu search metaheuristic that can check feasibility of proposed moves quickly
and reacts to repetitions to guide the search. Several new best solutions are found for benchmark problems. 相似文献
2.
In several key functional areas of contemporary engineering and management science, neural networks have steadily been gaining recognition as robust and reliable tools for classification problems. This paper describes a new application of the learning vector quantization neural network: the classification of the degree of modularization appropriate for the construction of an industrial facility. This neural network uses variables related to plant location, labor issues, organizational issues, plant characteristics, project risks, and environmental issues as inputs to perform the classification. The neural network training and performance evaluation is also discussed. 相似文献
3.
M. Niaz Asadullah Md. Abdul Alim M. Anowar Hossain 《Development policy review : the journal of the Overseas Development Institute》2019,37(4):486-503
While more girls are now attending school in Afghanistan than prior to 2010, there is a lack of evidence on how school attendance is helping their cognitive development. We use data from a large sample of all‐girls state‐funded school students to estimate for the first time the “learning profile” for Afghanistan. Students enrolled in grades 4 to 9 were assessed using the Early Grade Reading Assessment (EGRA) and the Early Grade Mathematics Assessment (EGMA) test items. We find that higher grade progression (particularly in grades 6–9) leads to almost no gain in numeracy (addition and subtraction) skills that should have been achieved in early grades. Similar results follow from the analysis of student performance in the EGRA test, particularly in oral reading fluency (correct words read per minute) and oral reading comprehension (number of correct answers out of 12). These findings warn that simply enrolling girls in school without improving the relationship between grade completion and learning is unlikely to transform the lives of women in Afghanistan. 相似文献
4.
5.
Niaz Murtaza 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2012,23(1):109-125
The calls for NGO accountability have grown louder in recent years, some based on genuine concerns to help improve their performance
and others on a desire to muffle their advocacy activities. Using a comprehensive analytical framework, this article finds
that current accountability approaches prioritize accountability to boards and donors and give weak accountability to communities
despite strong NGO rhetoric to the contrary. The article recommends the development of accountability mechanisms managed by
NGO coordination bodies and focused primarily on accountability to communities to improve NGO performance and protect them
from politically motivated attacks. 相似文献
1