面向大型分布式软件项目的敏捷开发模型研究

面向分布运行的大规模信息化项目,支持基于广域网络的协同开发团队,规避软件过程风险,确立在需求演进状态下实现"业务驱动开发"的软件过程管理模型,是软件工程领域的重要课题。我们采用的方法是:基于一个支持分布式软件开发的支撑平台,并拓展XP的基本属性,改"结对编程"为"分布式编程"和"IRC资源分配",从而完善传统XP存在的先天性不足,保证软件开发元素的完整性和关联紧密性,提高了系统开发效率和软件制品质量。     

An experimental investigation of personality types impact on pair effectiveness in pair programming

In this paper, pair programming is empirically investigated from the perspective of developer personalities and temperaments and how they affect pair effectiveness. A controlled experiment was conducted to investigate the impact of developer personalities and temperaments on communication, pair performance and pair viability-collaboration. The experiment involved 70 undergraduate students and the objective was to compare pairs of heterogeneous developer personalities and temperaments with pairs of homogeneous personalities and temperaments, in terms of pair effectiveness. Pair effectiveness is expressed in terms of pair performance, measured by communication, velocity, design correctness and passed acceptance tests, and pair collaboration-viability measured by developers’ satisfaction, knowledge acquisition and participation. The results have shown that there is important difference between the two groups, indicating better communication, pair performance and pair collaboration-viability for the pairs with heterogeneous personalities and temperaments. In order to provide an objective assessment of the differences between the two groups of pairs, a number of statistical tests and stepwise Discriminant Analysis were used.

不完备信息系统中集对粗糙集模型

粗糙集理论在数据挖掘中的成功应用已成为近来人工智能领域研究的热点,人们将经典粗糙集中的等价关系放宽后使粗糙集理论的运用更加广泛,但在不完备信息系统中的运用仍受到限制。在已有的集对粗糙集模型的基础上,提出了针对不完备系统更加有效的集对粗糙集模型,通过实例说明了这种模型的可行性和有效性,使粗糙集模型在一定程度上得到了推广。     

Pair breaking as a probe of d-wave high-temperature superconductivity

A unified picture is obtained of the Cooper pair-breaking data by Cu-site Zn and Ni in Nd_2–z Ce _z CuO₄, La_2–SrCuO₄, Bi₂Sr₂CaCu₂O₈, Bi_1.8Pb_0.2Sr₂Ca₂Cu₃O₁₀, YBa₂Cu₃O₇, and YBa₂Cu₄O₈. The data are generally inconsistent with spin-fluctuation d-wave pairing mechanisms of superconductivity and with all two-dimensional cuprate-plane models. The data are consistent with superconductivity in the charge reservoirs.     

A study on a quantum-inspired evolutionary algorithm based on pair swap

A quantum-inspired evolutionary algorithm (QEA) is proposed as a stochastic algorithm to perform combinatorial optimization problems. The QEA is evolutionary computation that uses quantum bits and superposition states in quantum computation. Although the QEA is a coarse-grained parallel algorithm, it involves many parameters that must be adjusted manually. This paper proposes a new method, named pair swap, which exchanges each best solution information between two individuals instead of migration in the QEA. Experimental results show that our proposed method is a simpler algorithm and can find a high quality solution in the 0-1 knapsack problem. This work was presented in part at the 12th International Symposium on Artificial Life and Robotics, Oita, Japan, January 25–27, 2007     

Sintering analysis of garnet-type ceramic as oxide solid electrolytes for rapid Li+ migration

Metallic doping can stabilize cubic phase Li₇La₃Zr₂O₁₂ (LLZO) solid electrolyte for high conductivity, due to the enhanced vacancies and disordered Li-site. However, the understanding of metallic doping in the crystal lattice during the high-temperature sintering process is still not clear. In present study, a gradient series of Fe doped LLZO are formulated via solid-phase reaction, and then investigated through crystal analysis and morphological characterization. Pair distribution function essay implies that doped Fe³⁺ promotes random distribution of Li⁺ over the available sites in the located crystal. Additionally, the ceramic morphology confirms that the particles sizes in LLZO pellets suddenly grow above 1000 ℃, and Fe doping can obviously suppress Li loss above 600 ℃. As a result, the LLZF0.15 exhibits the relatively high ionic conductivity of 1.99 × 10^–5 S cm^–1 at 45 ℃.     

Characterization of short-range order in an amorphous Cd–Se–Te system by wide angle X-ray scattering(WAXS)

Short-range orders of Cd_xSe_70−xTe₃₀ amorphous alloys of a chalcogenide system with 2≤x≤10 have been studied by wide-angle X-ray scattering (WAXS). Once the hypotheses on the local order of the alloy had been formulated, the radial distribution function (RDF) analysis have make it possible to evaluate them referring specifically to the coordination of the atoms. The structural parameters such as atomic distance between the different possible pairs of atoms in each element J(r), the structure factor F(q), the pair distribution function G(r) and the coordination numbers for amorphous samples have been discussed. Moreover, in our system, under study, the average coordination numbers of the three different atoms involved and their distance to the first coordination sphere have been determined. However, the extraction of the inverse Fourier transforms to generated atomic distribution function has led us to a simulated reduced interference function Q(q).     

复杂系统的集对模式识别方法

人类社会和科学技术的不断发展必然导致复杂性的提高,如今复杂大系统的发展已经向传统的模式识别方法提出了挑战。本着对复杂大系统呼唤新的模式识别方法的响应,探讨了基于统一集和集对分析的新的模式识别方法,提出了利用该方法进行模式识别的判定原则。最后文章还举例证明了该方法的有效性。