热轧板坯库出库计划编制模型与算法研究

为了解决板坯库出库计划的编制问题,提出了将板坯库出库计划分解为板坯出库优化决策和板坯最优倒垛决策组合优化问题,分别建立了板坯出库优化决策模型和板坯最优倒垛决策模型,利用两个模型分层协作完成出库计划的编制。为求解模型,构造了一种离散粒子群优化算法,采用适合模型的粒子取值方式和粒子速度变化方式。实际排产的结果表明,所建立的模型和算法切实可行。

Model server enabled management of collaborative changes in building information models

The issues and challenges involved in controlling the collaborative changes in a Building Information Modeling(BIM) data repository, in a multi-model collaboration environment, are discussed. It is suggested that managing iterative changes in BIMs is a database problem, exacerbated by the long transaction times needed to support collaborative design progression. This is yet to be resolved in the construction industry and better solutions are needed to support the underlying workflows and computing operations for seamless collaboration on BIMs. With this in mind, this paper proposes the use of the structural and semantic characteristics of BIM objects as a mechanism for tracking changes across co-developed solutions. The creation of object signatures, using hash codes derived from their characteristics, provides a potential mechanism for object comparison and effective change recognition and management.