Using object deputy model to prepare data for data warehousing

Providing integrated access to multiple, distributed, heterogeneous databases and other information sources has become one of the leading issues in database research and the industry. One of the most effective approaches is to extract and integrate information of interest from each source in advance and store them in a centralized repository (known as a data warehouse). When a query is posed, it is evaluated directly at the warehouse without accessing the original information sources. One of the techniques that this approach uses to improve the efficiency of query processing is materialized view(s). Essentially, materialized views are used for data warehouses, and various methods for relational databases have been developed. In this paper, we first discuss an object deputy approach to realize materialized object views for data warehouses which can also incorporate object-oriented databases. A framework has been developed using Smalltalk to prepare data for data warehousing, in which an object deputy model and database connecting tools have been implemented. The object deputy model can provide an easy-to-use way to resolve inconsistency and conflicts while preparing data for data warehousing, as evidenced by our empirical study.     

智能型数据挖掘工具的设计与实现

数据挖掘技术具有广阔的应用前景,研发具有独立知识产权的数据挖掘系统很有必要。SmartMiner是以在数据挖掘算法研究和专家系统研究中取得的成果为基础,提出的智能型数据挖掘工具。SmartMiner提出了挖掘作业描述语言MDL和挖掘任务模型脚本语言,设计了挖掘向导、可视化向导和挖掘任务模型,集成了数据仓库管理功能,挖掘引擎具有智能性,体系结构开放并可扩展。SmartMiner已经集成到一个大型商业连锁企业的经营决策系统中。     

LASG/IAP全球海洋环流模式的并行计算及其优化

研究了中国科学院大气物理研究所大气科学与地球物理实验室(LASG/AP)的全球海洋环流模式的串行计算特点，分析了共可扩展并行性，实现了基于一维纬向剖分的分布式存储和共享存储并行计算。结合目前高性能计算机的技术特点，研究了并行海洋环流模式的计算优化，提出若干优化策略。     

0.13-μm CMOS Phase Shifters for X-, Ku-, and K-Band Phased Arrays

Two 4-bit active phase shifters integrated with all digital control circuitry in 0.13-mum RF CMOS technology are developed for X- and Ku-band (8-18 GHz) and K-band (18-26 GHz) phased arrays, respectively. The active digital phase shifters synthesize the required phase using a phase interpolation process by adding quadrature-phased input signals. The designs are based on a resonance-based quadrature all-pass filter for quadrature signaling with minimum loss and wide operation bandwidth. Both phase shifters can change phases with less than about 2 dB of RMS amplitude imbalance for all phase states through an associated DAC control. For the X- and Ku-band phase shifter, the RMS phase error is less than 10^o over the entire 5-18 GHz range. The average insertion loss ranges from to at 5-20 GHz. The input for all 4-bit phase states is typically at -5.4 plusmn1.3 GHz in the X- and Ku-band phase shifter. The K-band phase shifter exhibits 6.5-13 of RMS phase error at 15-26 GHz. The average insertion loss is from 4.6 to at 15-26 GHz. The input of the K-band phase shifter is at 24 GHz. For both phase shifters, the core size excluding all the pads and the output 50 Omega matching circuits, inserted for measurement purpose only, is very small, 0.33times0.43 mm² . The total current consumption is 5.8 mA in the X- and Ku-band phase shifter and 7.8 mA in the K-band phase shifter, from a 1.5 V supply voltage.     

Proposal for All-Optical Switchable or/xor Logic Gates Using Sum-Frequency Generation

All-optical logic gate based on parametric processes in periodically poled lithium niobate (PPLN) waveguides is a promising technique in future high-speed all-optical signal processing. A simple realization of switchable or/xor logic gates at 40 Gb/s is proposed and numerically demonstrated using sum-frequency generation in a PPLN waveguide. By appropriately adjusting the input signal power and choosing the waveguide length, or and xor logic gates can be obtained. The operation performance is simulated, including eye diagrams and Q-factor. The input signal powers and waveguide length are optimized, providing a theoretical basis for achieving the optimal performance for the switchable or/xor logic gates     

细胞图像中一种具有类别选择功能的标识算法

在传统图像处理流程中,在实现目标计数和测量(如细胞计数和细胞参数计算)之前或之后要进行杂质和非同类目标的剔除工作。它一般由形态学运算或人机交互来进行。这里对传统区域标记法加以改造,利用体现细胞主要特征的面积等参数设计分类器,来判定当前目标是属于正确类别还是属于其它,仅对正确类别目标进行标识,避免了形态学运算带来的误差,降低了系统计算量。并给出了算法实现和结果。     

挖掘多支持率分类规则的虚拟投影算法

本文首先提出了一种挖掘频集的高效算法PP。它采用了一种基于树的模式支持集表示，避免了反复扫描数据库和递归建造个数与频繁模式数相同的模式支持集，其效率比Apriori和FPGrowth高1—3个数量级。PP被进一步扩展成发现分类规则的有效算法CRM-PP。CRM-PP将多支持率剪裁集成到频集发现阶段，将二阶段挖掘法改进为单阶段挖掘法。CRM-PP的效率也比基于Apriori和FPGrowth的二阶段算法高1—3个数量级。     

The distribution of magnesium and silicon across the as-cast interface of aluminum laminates produced via the Novelis Fusion™ process

Novelis Inc. recently introduced a multi-alloy, multi-layered, aluminum ingot solidification technology that allows the production of a variety of engineered clad products on a commercial scale. The technology allows selection of the appropriate combinations of clad and core alloys to produce desired mechanical properties as well as forming and surface characteristics superior to either monolithic material alone. It has been shown that the Novelis Fusion™ interface is oxide film and porosity free. This article analyzes the interplay of the aforementioned alloy combinations giving particular attention to the cast intermetallics, the diffusion of silicon and magnesium, the population of secondary phase particles (dispersoids) at the interface, and the rate of diffusion.     

TEM analyses of synthetic anti-ferromagnetic (SAF) nanoparticles fabricated using different release layers

This paper investigates the structural characteristics of templated synthetic anti-ferromagnetic (SAF) magnetic nanoparticles fabricated on two different release layers. When copper was used as the latter, the layered structure of the SAFs was found to be disrupted with wavy multi-layers due to the formation of copper grains from the release layer. By introducing oxygen into the copper release layer before the deposition of the film, the topography of the oxidized copper grains was effectively controlled. This led to the fabrication of SAF nanoparticles with flat multi-layers.     

Measurement of Epoxy Resin Tension, Compression, and Shear Stress–Strain Curves over a Wide Range of Strain Rates Using Small Test Specimens

The next generation aircraft engines are designed to be lighter and stronger than engines currently in use by using carbon fiber composites. In order to certify these engines, ballistic impact tests and computational analyses must be completed, which will simulate a “blade out” event in a catastrophic engine failure In order to computationally simulate the engine failure, properties of the carbon fiber and resin matrix must be known. When conducting computer simulations using a micromechanics approach, experimental tensile, compressive, and shear data are needed for constitutive modeling of the resin matrix material. The material properties of an Epon E862 epoxy resin will be investigated because it is a commercial 176°C (350°F) cure resin currently being used in these aircraft engines. These properties will be measured using optical measurement techniques. The epoxy specimens will be tested in tension, compression and torsional loadings under various strain rates ranging from 10?5?to?10?1?s?1 and temperatures ranging from room temperature to 80°C. To test the specimens at high temperatures, a specialized clear temperature chamber was used. The results show that the test procedure developed can accurately and quickly categorize the material response characteristics of an epoxy resin. In addition, the results display clear strain rate and temperature dependencies in the material response.