HTN规划中面向多计划生成的顺序任务分解算法

顺序任务分解算法(OTD)是层次任务网规划(HTN)中的一种高效求解算法.由于算法中的计划生成采用一次性回溯机制,每次求解过程只能产生一个可行计划.文中提出了一种能够快速生成多个可行计划的回溯算法.该算法采用分段回溯的计划生成机制,充分利用了求解过程中生成的局部解序列,从而能够一次性地快速生成多个可行计划,为寻求优化的计划和进行计划的评估提供更为有效、灵活的支持.     

民机交付计划研究模型

合理的交付计划对民机项目风险管理、投资收益管理至关重要。该文将市场预测模型、竞争力评价模型、产品全生命周期S曲线理论有效结合，构建一套通用可行的民机交付计划预测模型，为民机制造商项目可行性分析提供理论依据。     

炼油厂气分装置生产计划与工艺条件的集成优化

为在操作指标受到限制且要满足产品质量要求时,也可保证得到可执行的生产计划,建立了生产计划与工艺条件的集成优化模型。在该模型中,加入工艺条件约束,利用生产计划优化软件与流程模拟软件结合求解。在求解非线性优化模型时,使用了逐次反馈修正装置收率限制的迭代方法。加入了判断生产计划是否可行以及求解不可行物流的收率限制。对某炼油厂气体分离装置生产计划与工艺条件进行集成优化。结果表明,该模型可以得到最优的可行生产计划,有实用价值。     

炼油厂气分装置生产计划与工艺条件的集成优化

为在操作指标受到限制且要满足产品质量要求时,也可保证得到可执行的生产计划,建立了生产计划与工艺条件的集成优化模型。在该模型中,加入工艺条件约束,利用生产计划优化软件与流程模拟软件结合求解。在求解非线性优化模型时,使用了逐次反馈修正装置收率限制的迭代方法。加入了判断生产计划是否可行以及求解不可行物流的收率限制。对某炼油厂气体分离装置生产计划与工艺条件进行集成优化。结果表明,该模型可以得到最优的可行生产计划,有实用价值。     

从卫生入手改进农村人居环境

改善农村人居环境是建设社会主义新农村实现村容整洁的必由之路，有计划、有步骤、有选择地开展村庄整治是改善农村人居环境的一条可行路子。通过实际开展工作，总结各地改善农村人居环境的成功经验，我们认为从卫生入手抓起，改进农村人居住环境是最为可行的。     

合作教育初探

合作教育计划是美国大学生混合资助体系中的一种有效的自助性资助方式。根据我国高等师范教育的实际情况，实施合作教育计划是完全可行的，也是十分必要的。文章以师专为背景讨论了我国高师合作教育计划的初步设想，探讨高师办学模式的改革和大学生资助方式的发展。     

生产计划编制的有限能力计划法

对小批量类型生产制定合理可行的生产计划是一类极为复杂的问题。本文在分析该类企业生产主要特点的基础上，建立了编制生产计划的有限能力计划法。该方法在满足产品项目交货期的同时，根据各工作中心的工作能力，具体为各工作中心编制了相应生产计划。并通过实例验证其可行性和合理性。     

工程项目工期风险管理分析

目前，量化，半量化风险是工程项目风险分析的主流。在工程项目实施前编制进度计划，由于受到人力、物力、财力、施工环境等因素的影响，具有不确定性。编制的计划属于预测研究。为了反映网络计划时间参数具有预测的属性。以及实施过程中影响因素的部分信息确知、部分信息不确知的特点，文章将模糊三角数引入到网络进度计划中，建立基于模糊网络的工程项目进度计划。     

学校介入防治儿童单纯性肥胖试验及思考

针对我国城市儿童肥胖症快速增长的流行趋势，试验由学校介入，统一安排肥胖儿减肥计划，试验证明在校内组织实施肥胖儿童综合减肥计划成效显著，学校介入防治儿童肥胖症是可行的，应在经验总结的基础上加以推广。     

罗斯福放弃印度支那托管计划原因新探

二战期间，罗斯福多次在不同场合表示要托管印度支那，但是最终在其去世之前放弃了托管印度支那的构想。罗斯福放弃托管计划英法等国以及罗斯福政府内部的反对是重要因素，但最重要的还是罗斯福总统的不作为，他没有为推行其计划根据国际环境的变化制订可行的方案。     

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).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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.