服装单件生产流水线仿真优化

为探究服装单件生产流水线的设计与仿真优化过程,基于工序编排的原则,得到了女士棉服的单件生产流水线编排方案。通过工序拆分、工序重组等优化方法对上述流水线安排方案进行优化,并建立了生产流水线结构模型。利用所建立的模型进行女士棉服的单件生产流水线仿真研究,并将仿真过程与实际生产进行对比。结果表明,所建立的模型可实现对服装单件生产流水线的仿真模拟,整个试验过程与实际生产吻合较好。该研究方法及其结果为后续不同形式的服装生产流水线仿真优化奠定了基础。     

基于Flexsim的服装单件流水线仿真优化

选取一款女衬衫为实验对象,从服装单件流水线生产的影响因素入手,借助Flexsim软件对该款女衬衫单件流水线进行仿真优化研究.然后通过对该款女衬衫工序分析中的原始数据进行仿真实验,借助拟合软件对测得的实验数据进行函数分析,找出流水线中瓶颈工位工时,在此基础上对该单件流水线工序进行组合兼顾后再次进行模拟仿真的循环测试,最终使该流水线瓶颈工时得以降低,生产平衡率极大提高.     

服装工厂工时定额的测定与分析

浮余率和纯加工时间是制定服装生产工时定额的重要参数。本文就有关的观测方法与公式应用进行了探讨。通过对服装工厂工时定额的实测与比较,分析了定额出现差异的原因,并指出了利用工时定额研究以促进服装生产效率提高的途径。     

针织T恤快速生产工序的优化

研究服装生产中的工序优化和工序负荷的平衡设计问题,对针织T恤生产线进行了工序整合,建立了工艺数据库,改进了生产系统.生产实践显示,对流水线的工序优化达到了平衡、快速生产的目标,提高了服装生产的整体效益.     

工作抽样法在家具企业生产管理中的应用

运用工作抽样法对A家具企业生产现场的工人作业情况和设备作业情况做子大量的抽查，找出影响企业生产效率的原因，并且提出改进的方法；同时根据抽查结果确定A企业用于建立工时标准的宽放率。研究表明，家具企业装卸、搬运、等待等活动中所花费时间的比例偏高，大大减少了有效工作时间，增加了设备闲置、空转的浪费。因此，重视在运送中浪费的时间和因操作所花去的非生产性时间对提高家具企业的生产率极为重要。     

基于流水线装配生产率问题的Spreadsheet仿真模型

在流水线生产中,由于两工序间存储空间有限,前序工人与后续工人之间相互影响.为了研究流水线中存储空间对生产率的影响,提高流水线工人生产率,本文利用Spreadsheet建立仿真模型,通过仿真模拟,研究分析流水线生产中两工序之间没有存储空间时及增加存储空间后对生产效率的影响.为解决流水线装配问题提供一种新的方法.     

考虑产品堕化的生产计划与设备维修集合优化研究

针对单设备生产系统为解决生产计划与维修计划独立决策的不足,构建了生产计划与设备维修计划的联合优化模型。考虑设备役龄对产品加工工时的影响,在联合优化模型中引入产品堕化效应。在分析设备故障时,区分设备闲置状态和生产状态,同时考虑产品实际加工时间和设备役龄的关系,以生产计划与设备维修计划的集成计划总费用最小为优化目标,建立考虑产品堕化和设备运行时间的生产与维修的联合优化模型。运用改进粒子群算法求解能力约束下的联合优化问题,结合算例分析,说明联合优化模型在企业生产中的实用性,验证该联合优化模型的有效性和应用价值。     

微型计算机辅助服装缝纫流水线优化设计

本文以分支界限法为基础,探讨了服装缝纫流水线最优设计的数学模型,提出了评价流水线设计方案的主要因素及其评价值,并且实现用微机进行辅助设计。通过对实例缝纫工序的优化组织,表明用本文提出的方案进行服装缝纫流水线设计,不仅省工省时,而且可提高流水线的编制效率。     

集装箱码头泊位生产运作优化模型

为提高集装箱码头泊位各类设备配置在生产运作中的衔接效率,研究了在装卸岸桥-搬运集卡-堆场吊桥作业系统下的设备优化配置问题.以时间为度量,综合考虑泊位作业收益最大和各类设备的闲置成本与运行费用整体最低确定设备配置数量,并运用数学分析的方法构建了描述集装箱码头泊位生产运作的非线性整数优化模型.实例验证该优化模型对于描述集装箱码头泊位的实际生产运作情况具有很好的实用性和合理性.     

基于工业工程的集装箱后端框装配线的平衡

装配生产线是制造业中常见的一种生产作业形式,其效率直接影响整个生产线的生产效率。针对某集装箱公司后端框装配生产线的实际状况,以实际测定工时为据,找出瓶颈工序。运用工业工程方法对装配生产线进行分析改善,并利用Flexsim仿真软件对改善方案进行效果评价。结果表明,装配线平衡率由改善前的76. 2%提高到90. 4%,单日最大产能为225件,较改善前的产能提高了38件,减少了作业时间浪费,进而提高了产线效率。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.