弱区组设计与三连码

提出了一种新的组合编码方法，即将经典的平衡不完全区组设计的条件减弱，引入“弱区组设计”的概念，使得编码方法更加灵活．作为这种编码方法的一个实例，我们构造了三连码．     

一类部分均衡不完全区组设计的构造

区组设计与复数旋转码是互相促进的,受文献[1]的启发,寻找部分均衡不完全区组设计PBIBD的简单构造。从复数旋转码的编码原理出发,给出了构造GF（p）及GF（P^*）上的一类PBIBD的简单而实用的算法,从而在一定基础上推广复数旋转码及提高了它的编码速度。     

有限奇异酉几何与PBIB设计

利用扩充酉群的可逆性，通过矩阵方法，选取有限奇异酉几何中的２维全迷向子空间作处理，构作了一个有多个结合类的对称结合方案和一些部分平衡不完全区组（ＰＢＩＢ）设计，并计算了全部参数．     

（v,3×4,1）-分裂平衡不完全区组设计的存在性

设（v,u×c,λ）-SBIBD表示一个阶数为v区组大小为u×c指数为λ的分裂平衡不完全区组设计.（v,u×c,λ）-SBIBD存在的必要条件是v≥uc,λ（v-1）≡0（mod c（u-1））和λv（v-1）≡0（mod c2u（u-1））.对分裂平衡不完全区组设计的研究不仅有它的理论意义而且它和设计理论、图论以及分裂认证码有着密切的联系.文章利用差的方法和递推构作方法证明了当v≡1（mod 96）时,存在（v,3×4,1）-分裂平衡不完全区组设计.作为它的应用得到了一类最优4-分裂认证码.     

基于组合设计框架的无线传感器网络密钥预分配方案

本文研究了基于超单纯平衡不完全区组设计的无线传感器网络的密钥预分配方案。主要采用了基于部分平衡t设计的组合研究框架,运用matlab仿真方法对该方案的基本度量进行计算和分析,发现该方案与基于指数为1的平衡不完全区组设计的方案相比,保持了连通性,适当牺牲了弹性,但获得了更大的实用性。     

一类部分均衡不完全区组设计的构造

区组设计与复数旋转码是互相促进的,受文献[1]的启发,寻找部分均衡不完全区组设计PBIBD的简单构造.从复数旋转码的编码原理出发,给出了构造GF(p)及GF(pe)上的一类PBIBD的简单而实用的算法,从而在一定基础上推广了复数旋转码及提高了它的编码速度.     

基于正交阵列的广播加密方案

广播加密是一种应用广泛的群组安全通信方案,在付费有线电视、在线数据库和无线传感网络等场合具有良好的应用前景．文章根据Stinson的广播加密思想,提出用正交阵列构造的强部分平衡不完全区组设计来构造广播加密方案．该新方案在抵御合谋攻击上有明显优势．文章最后还提出用对偶设计改进方案的广播信息率．     

关于混合设计模型处理效应估计的进一步讨论

１９９２年Ｋｈｕｒｉ．Ａ．Ｌ提出在区组设计正交条件下，混合设计模型中参数向量β（不含βλ０的区组内估计与联合估计是一致的；本文则研究了混合设计模型中位置参数β０的三咱估计，并证明了在区组设计正交条件下βλ的区组内估计β０、经典ＬＳＥβ０，与联合估计β０是一致的。这一工作将ｋｈｕｒｉ．Ａ．Ｌ的结果推广到处理效应的全部待估参向量τ＝（β０，β）在区组设计正交条件下都是一致的，对人们在混合设计中采用正交     

旗传递6-设计

具有良好传递性的区组设计是代数组合学研究的一个重要领域．重点研究旗传递6-设计,并证明如果一个6-（v,k,λA）设计允许一个旗传递自同构群,则λ〉20．     

区组设计

区组设计是一个有吸引力的研究领域，组合学家和统计学家对它的发展作出了重要贡献。现有文献中有各种水平、侧重面不同的关于区组设计专著。     

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.