考虑延误因素的机组排班模型研究

机组排班是航空公司运营计划的重要环节。传统对机组排班问题的研究,通常不考虑延误对排班的影响,导致机组排班的鲁棒性较差。本文在传统机组排班模型的基础上考虑延误成本,以最小化各项任务成本和延误成本为目标,提出了考虑随机延误因素的机组排班数学规划模型。然后提出求解此模型的启发式列生成算法,该算法可有效缩小问题规模,减少求解过程中的迭代次数并提高求解质量。利用航空公司真实飞行数据进行测试,证明算法可在短时间内求解大规模机组排班问题。最后,通过仿真试验证实考虑延误的机组排班模型可有效提升排班的鲁棒性。     

Emergent Tact Control Following Stimulus Pairing: Comparison of Procedural Variations

We examined emergent tact control following stimulus pairing, using 2 different stimulus presentation arrangements. In the word-first condition, presentation of the auditory stimulus preceded the visual stimulus, and in the image-first condition, the visual stimulus preceded the auditory stimulus. Eight children (2–5 years old) participated. In Experiment 1, 4 children were exposed to 3 sessions in each condition with a new set of stimuli in each session. In Experiment 2, 2 of the same children received repeated exposure to the same stimulus sets. Experiment 3, with new participants, was identical to Experiment 1, except visual and auditory stimuli overlapped during the presentation. Postsession probes documented emergent stimulus control over 1 or more vocal responses for 7 of the 8 participants. Participants were more likely to make echoic responses with the visual stimulus present in the word-first condition; however, emergent tact control was unaffected by the order of the stimulus presentation. Additional research is needed on stimulus-pairing procedures and on the role of echoic responding in emergent tact control.     

Evaluating the Effectiveness of the Stimulus Pairing Observation Procedure and Multiple Exemplar Instruction on Tact and Listener Responses in Children with Autism

The Analysis of Verbal Behavior - The stimulus pairing observation procedure (SPOP) combined with multiple exemplar instruction (MEI) has been shown to be effective with typically developing...     

试论舜从妻居形态与虞、妫两族财产争夺案

《孟子》等古文献中所说舜之父瞽叟和舜弟象合谋害舜的传说故事,实际上反映了从母系氏族向对偶家庭发展过程中,男子的角色在从抚养和监护弟与外甥到抚养自己亲生子女的转变中出现的矛盾。舜从妻居并建立了对偶家庭,与固有的男子在母系氏族社会组织中所承担的义务和责任发生了冲突,并因财产争夺而引起了矛盾斗争。虞舜与其父其弟矛盾斗争的传说故事具有特殊的历史意义,为研究尧舜传说时代社会组织形态的进化提供了范例。     

An Investigation of Stimulus Pairing and Listener Training to Establish Emergent Intraverbals in Children with Autism

The Analysis of Verbal Behavior - We examined two methods to facilitate the emergence of untaught intraverbal responses to children with autism. Listener behavior training (LT) involved...     

A_2H_n(n=2-6)的成键情况

本文讨论了含A-A键的A_2H_n(n=2-6)体系的成键规则,导出了相应能级和波函的成对定理。得出了A_2H_n中成键情况、价电子填充情况以及A-A键和A-H键的键级。结果表明:A_2H_n中A原子的杂化状态由价电子数决定。价电子数相同的A_2H_n,不仅几何构型相似,而且键级也相同。