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In sequencing problems for mixed-model assembly line in JIT production system, the Goal Chasing method (GC) is widely used for parts used leveling goal. The difference in assembly time of each product is not taken into consideration in the Goal Chasing method. Assembly time usually varies with product types. In recent years, the Time-Based Goal Chasing method (TBGC) has been proposed. The advantage of TBGC is to consider the influence of different assembly time of each product and idle time in production period. TBGC, however, has been only applied to single work station problems. In this paper, TBGC is applied to an assembly line problem with multiple work stations. Furthermore, the sequencing method and use of Simulated Annealing (SA) or Local Search (LS) for this problem are proposed. 相似文献
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Ziming Xuan Howard Shaffer 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2009,25(2):239-252
Objective: To examine behavioral patterns of actual Internet gamblers who experienced gambling-related problems and voluntarily closed
their accounts. Design: A nested case–control design was used to compare gamblers who closed their accounts because of gambling problems to those
who maintained open accounts. Setting: Actual play patterns of in vivo Internet gamblers who subscribed to an Internet gambling site. Participants: 226 gamblers who closed accounts due to gambling problems were selected from a cohort of 47,603 Internet gamblers who subscribed
to an Internet gambling site during February 2005; 226 matched-case controls were selected from the group of gamblers who
did not close their accounts. Daily aggregates of behavioral data were collected during an 18-month study period. Main outcome measures: Main outcomes of interest were daily aggregates of stake, odds, and net loss, which were standardized by the daily aggregate
number of bets. We also examined the number of bets to measure trajectory of gambling frequency. Results: Account closers due to gambling problems experienced increasing monetary loss as the time to closure approached; they also
increased their stake per bet. Yet they did not chase longer odds; their choices of wagers were more probabilistically conservative
(i.e., short odds) compared with the controls. The changes of monetary involvement and risk preference occurred concurrently
during the last few days prior to voluntary closing. Conclusions: Our finding of an involvement-seeking yet risk-averse tendency among self-identified problem gamblers challenges the notion
that problem gamblers seek “long odds” during “chasing.” 相似文献
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Leiserson V Pihl RO 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2007,23(4):435-455
Given the central role of perseverative chasing in problem gambling, the present study sought to find evidence for three hypothesized
components of perseveration in problem gamblers: reward-sensitivity dominance, deficient inhibition of reward-seeking behavior,
and working memory deficits. This was the first attempt to examine working memory deficits in problem gamblers using a conditional
association task, which is associated with posterior-dorsolateral prefrontal functioning. In a sample that was not in treatment,
and representative in terms of comorbidity, problem gamblers performed significantly worse on the conditional association
working memory tasks after controlling for general memory function, compared to demographically-matched controls. This is
significant because deficits in the dorsolateral prefrontal region have been consistently associated with perseveration, which
suggests that problem gamblers’ perseverative chasing may be associated with a working memory deficit. Problem gamblers were
not significantly higher than at-risk gamblers in terms of reward-sensitivity dominance (measured as a personality trait in
terms of extraversion) suggesting that it may not be specifically associated with problem gambling. Sensation-seeking was
also not associated with problem gambling in a sample that corrected for the methodological problems of previous studies which
examined it. The need for gambling research to focus specifically on the perseverative inability to stop gambling is emphasized,
and the present findings of specific working memory deficits in problem gamblers suggest the need for further examination
of working memory as a potential risk factor for problem gambling. We propose that subsequent studies examine working memory
in terms of the self-regulatory capacity for goal maintenance where attention must specifically be allocated to resist interference. 相似文献
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"运河战略"是中国科学院中国现代化研究中心主任何传启先生设计的中国现代化的路径选择,其核心思想是超越,而超越的动力是创新,包括科技创新、文化创新、制度创新等方方面面的创新。本文从文化、教育和科学三方面谈点认识。 相似文献
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