UDP实现基于标识的终端移动性支持方案

在分析了各种终端移动性支持协议的基础上,提出了一种将接入标识和交换路由标识分离的终端移动性支持方案,并基于UDP协议实现.通过实验表明该方案具有可行性,并且与目前的各种终端移动性支持协议相比,可以很好地支持终端的移动性,保证用户的隐私性、安全性和核心设备的安全性,保障网络的可控可管性.文章还针对此方案大规模应用时会出现的问题做出了预测,并提出了初步的解决方法.     

XML映射与一种分布式数据库集成系统模型

讨论了XML与关系数据库数据的转换,定义了基于XML的映射规则R2X,将分布式数据库数据映射为符合用户要求的XML文档。提出一个基于R2X的分布式数据库集成模型,并对系统中的主要模块给出了具体的实现方法。     

Zm上的负循环码和自对偶码

利用环直和分解的性质研究了Zm（m≥6）上的负循环码与其直和项上负循环码之间的关系,通过定义Zm与环的直和项有相同特征的剩余类环之间的同构映射ψ,得到了在同构映射ψ作用下环Zm上负循环码与其外直和项上负循环码关系,给出了Zm上自对偶码存在的充分必要条件．     

基于UML技术的功能点规模度量研究

基于统一建模语言（Unified Modeling Language,UML）技术的软件规模估算的特点,归纳出UML的类图和顺序图到功能点的映射规则,并通过实例分析得知,利用这些映射规则有助于比较精确地获得面向对象软件开发项目的规模度量结果,使国际功能点用户协会（IFPUG）、功能点分析（FPA）方法可以更有效地适合于面向对象的开发环境。     

基于功构映射的拆卸设备设计方法

针对拆卸对象和拆卸过程对拆卸设备设计的特殊要求,提出了基于功构映射的拆卸设备设计方法。将拆卸设备的概念设计过程定义为需求域、功能域、行为性能域和结构域之间的映射过程和求解过程,利用面向对象技术构建了拆卸设备设计的需求信息集合;运用功能分解和功能表面集成规则构造了功能集合和行为性能集合;定义了拆卸设备设计过程的需求-功能映射模型和功能-结构映射模型。通过需求信息的层级提取、映射和参数化,生成了用于拆卸设备结构重构的基本约束矩阵,用于指导拆卸设备的创新设计。通过键盘拆卸设备的设计,验证了所提方法的有效性和实用性。     

GEOPHYSICAL CHARACTERIZATION OF THE SANGU GAS FIELD,OFFSHORE, BANGLADESH: CONSTRAINTS ON RESERVOIRS

The only produced offshore gas field in Bangladesh, known as the Sangu field, is located in the Hatiya Trough in the east of the Bay of Bengal, and has estimated total reserves of about 1055 BCF GIIP. The early shut-down of the field in October 2013 may have resulted in significant volumes of recoverable gas being left in the subsurface over a depth range of 1893 m to 3640 m. In this paper, seismic and well log data were analyzed and interpreted in order to investigate the structure and stratigraphy of the Sangu field, together with the lithology, extent and petrophysical properties of the reservoir. The general lithostratigraphy at Sangu has some similarity to that of the Surma Basin of the Bengal Foredeep. Reservoir rocks consist of Miocene and Pliocene deltaic sandstones and deep-water clastics. The source rock is the Miocene Bhuban Shale which is mature for gas generation in the Hatiya Trough. Three Neogene seismic stratigraphic megasequences were recognised at Sangu and are interpreted to have been deposited respectively in fluvial, delta front and shelf slope or marginal marine settings. Based on an analysis of wireline logs from wells Sangu-1 and Sangu-5 and on seismic-to-well ties, a series of reservoir units referred to (from the base up) as the T1 (E, D, C, A&B), Supra-T1, T2 and T3 have been identified. Petrophysical analyses showed that the average total porosity of these reservoir units is >13%, the permeability is in general less than10 mD, and the gas saturation ranges from 24% to 80%. Mapping of the reservoirs shows that the structure at Sangu is an asymmetric anticline with a NNW-SSE axial trend. Amplitude data have allowed the delineation of two other potential reservoir zones in the field at depths of 2900-3000 m and 3550-3750 m. The study will contribute to future offshore gas exploration and development in the Bay of Bengal region based on the geological and geophysical characteristics of the reservoirs delineated.     

Discovery and Pharmacophore Mapping of a Low-Nanomolar Inhibitor of P. falciparum Growth

The treatment of malaria, the most common parasitic disease worldwide and the third deadliest infection after HIV and tuberculosis, is currently compromised by the dramatic increase and diffusion of drug resistance among the various species of Plasmodium, especially P. falciparum (Pf). In this view, the development of new antiplasmodial agents that are able to act via innovative mechanisms of action, is crucial to ensure efficacious antimalarial treatments. In one of our previous communications, we described a novel class of compounds endowed with high antiplasmodial activity, characterized by a pharmacophore never described before as antiplasmodial and identified by their 4,4’-oxybisbenzoyl amide cores. Here, through a detailed structure-activity relationship (SAR) study, we thoroughly investigated the chemical features of the reported scaffolds and successfully built a novel antiplasmodial agent active on both chloroquine (CQ)-sensitive and CQ-resistant Pf strains in the low nanomolar range, without displaying cross-resistance. Moreover, we conducted an in silico pharmacophore mapping.     

面向室内移动机器人的改进3D-NDT点云配准系统

点云配准是室内移动机器人位姿估计和环境构建的关键步骤,现有点云配准算法难以工作在低纹理场景中。为提高室内移动机器人环境适应能力,提出了一种改进三维正态分布变换（3D NDT）点云配准算法。通过改进ORB特征提取算法,确保低纹理下的特征点提取;此外,为提高点云配准精度和效率,提出改进的3D NDT算法快速获取高精度的点云配准矩阵。采用国际知名的公共数据集TUM作为评测数据,实验结果表明本文算法达到或优于现有主流点云配准算法的性能（均方根误差低于002 m）,相对传统3D NDT算法配准时间缩短3倍以上;并且能工作在低纹理场景中。因此,改进的算法能提高室内移动机器人环境适应能力。     

带准备时间的柔性流水车间多序列有限缓冲区排产优化问题

针对带准备时间的柔性流水车间多序列有限缓冲区排产优化问题,提出一种改进的紧致遗传算法（Improved compactgenetic algorithm,ICGA）与局部指派规则结合的方法来解决该问题。全局优化过程采用改进的紧致遗传算法,为了克服紧致遗传算法（Compact genetic algorithm,CGA）易早熟收敛的问题,提出一种基于高斯映射的概率模型更新方式,在保持紧致遗传算法快速收敛特性的前提下,扩展了种群中个体的多样性,增强了算法进化活力。为减少生产阻塞和降低准备时间对排产过程的影响,设计了多种局部启发式规则来指导工件进出多序列有限缓冲区的分配和选择过程。采用某客车制造企业中的实例数据进行测试,测试结果表明,改进的紧致遗传算法与局部指派规则配合使用,能够有效解决带准备时间的柔性流水车间多序列有限缓冲区排产优化问题。     

Genome-wide mapping of the dominance effects based on breed ancestry for semen traits in admixed Swiss Fleckvieh bulls

Heterosis is the beneficial deviation of crossbred progeny from the average of parental lines for a particular trait. Heterosis is due to nonadditive genetic effects with dominance and epistatic components. Recent advances in genotyping technology have encouraged researchers to estimate and scan heterosis components for a range of traits in crossbred populations, applying various definitions of such components. In this study, we defined the intralocus (dominance) component of heterosis using local genetic ancestry and performed genome-wide association analysis for admixed Swiss Fleckvieh bulls and their parental populations, Red Holstein Friesian and Swiss Simmental, for semen traits. A linear mixed model for 41,824 SNP, including SNP additive genetic, breed additive, and breed dominance effects on 1,178 bulls (148 Red Holstein Friesian, 213 Swiss Simmental, and 817 Swiss Fleckvieh) with a total of 43,782 measurements was performed. In total, 19 significant regions for breed dominance were identified for volume (2 regions on Bos taurus autosome 10 and 22) and percentage of live spermatozoa (17 regions on Bos taurus autosome 3, 4, 5, 7, 13, 14, and 17), and genes associated with spermatogenesis, sperm motility, and male fertility traits were located there. No significant region for breed dominance was detected for total number of spermatozoa. The signals for breed dominance were relatively wide, most likely due to limited numbers of recombination events in a small number of generations (10–15 generations) of crossbreeding in the recent Swiss Fleckvieh composite.