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Search Results: 1 - 10 of 141870 matches for " WANG Tian-qing "
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Acquisition of all credible rules and reductions inordered interval-valued decision systems

WANG Tian-qing,XIE Jun,
,谢 军

计算机应用研究 , 2012,
Abstract: 基于描述子的规则获取可导出序值决策系统中的所有可信规则, 但对包含区间值序决策系统却不能有效支持。因此, 首先根据每个属性值域的范围, 提出了一个区间段值的概念, 用以将序区间值决策系统转换为序区间段值决策系统; 然后, 在序区间段值决策系统中提出了基于区间段值的优势和弱势描述子概念, 用以导出序区间值决策系统中的所有可信规则; 最后, 研究了两种新的描述子的约简以及相对约简问题, 给出了相应的判定定理与区分函数。以上为从序区间值决策系统中获取有效的最优可信决策规则提供了一种新理论基础与操作手段。
CMMI Based Software Risk Management

WANG Tian-Qing,PAN Jin-Gui,

计算机科学 , 2005,
Abstract: Large software projects will often be companied by some risks,which might have some adverse impacts on projects, so we need to manage risks. In Defined level of CMMI criterion,there is a process area of Risk Management, which is the base of our software risk management implementation. We divide Software Risk Management into five steps: Risk Identify,Risk Analyze,Risk Plan,Risk Track and Risk Control,thus we total manage the risks.
Neighborhood Based Rough Sets in Incomplete Interval-valued Information System

WANG Tian-qing,XIE Jun,

计算机科学 , 2013,
Abstract: 目前对未知区间值的研究还处于起步阶段。以包含复杂的遗漏型未知区间值不完备信息系统为研究对象,提出了一种基于灰格运算和Hausdorff距离的新的邻域关系。在此基础上,依次提出了邻域关系、最大相容类和邻域系统3种灰色粗集模型。进一步讨论了3种灰色粗集模型之间的上、下近似空间,以提高近似空间的精确度,并用实例进行了分析及验证。
Uncertainty analysis of resource scheduling in grid computation

WANG Tian-qing,XIE Jun,ZENG Zhou,

计算机应用 , 2007,
Abstract: Resource scheduling technology is a part of grid core service technology. In the process of the Grid system emulation experiment, many uncertain factors of resource scheduling were found. These factors would influence qualities of Grid system in various degrees. As a kind of learned disquisition based on experiment, the uncertain factors t found in experiment were analyzed, and resource scheduling strategy was improved accordingly.
UML State Diagram-based Test Case Generation of OO Software

JIANG Man,WANG Tian-Qing,PAN Jin-Gui,

计算机科学 , 2006,
Abstract: This paper introduces the development of software testing technology, puts forward a method to obtain test cases from UML State Diagram. Test cases will be generated from the transitions (transition path) of the State Diagram. The method above is absolutely based on UML and can generate less but more effective test cases, which can be automated easily. Then we improve the depth-first-search algorithm and bring forward an algorithm to obtain test cases from UML State Diagrams, which travel the State Diagram from the initial state to the ending states and find all the transition paths. And we can get the maximum of basic path based on cycle complexity, namely the minimum of test case.
Neighborhood systems based rough sets in interval-valuedinformation system

WANG Tian-qing,ZHAO Liang-hui,XIE Jun,
,赵良辉,谢 军

计算机应用研究 , 2012,
Abstract: Pawlak's rough set theory offers a formal theoretical framework to deal with categorical data, but this model is not applicable to interval data which widely exist in real world applications. By using grey lattice operation and Hausdorff distance, this paper provided a new neighborhood relationship in an interval-valued information system. Furthermore, it proposed three forms of rough set models based on neighborhood relationship, maximal consistent blocks and neighborhood system, which was to improve the accuracy of approximations. Moreover, it employed three numerical examples to substantiate the conceptual arguments.
Photon absorption of conduction band electronsand impact ionization under irradiation of few-cycle ultrashort laser pulses

Wang Xiao-Feng,Jia Tian-Qing,Xu Zhi-Zhan,

物理学报 , 2005,
Abstract: We discuss the limitation of classical Drude Model, solve the kinematics equation for electrons in the few-cycle laser field, and calculate the photon absorpti on of conduction-band electrons(CBE) and impact ionization under irradiation of few-cycle ultrashort laser pulses. The effects of laser intensity, carrier-en velope-phase on impact ionization are discussed.
A Novel Method of Extracting Total RNA from Rice Embryo Samples
从水稻种胚中提取RNA的新方法 A Novel Method of Extracting Total RNA from Rice Embryo Samples

Wen-Biao Shen,Ren Wang,Yi-Hua Wang,Tian-Qing Zheng,Jian-Min Wan,
,汪仁,王益华,郑天清,万建民SHEN Wen-Biao,Wang Ren,WANG Yi-Hua,ZHENG Tian-Qing,WAN Jian-Min

遗传 , 2003,
Abstract: A novel and simple CTAB-LiCl-based extraction method for high-quality and total RNA of rice embryo samples is developed. This method can efficiently eliminate the interference of polysaccharide and lipids rich in rice (Oryza sativa L.) embryo obtained under room temperature without using liquid nitrogen. The results of ultraviolet spectrophotometer and agarose gel electrophoresis analysis show that the obtained RNA has no obvious degradation and a good purity sufficient for further RT-PCR and RNA gel blotting. Therefore, it is also especially useful for the RNA extraction of plant material plenty of polysaccharide and lipids.
Propagation property of ultra-short laser pulses in multi-level quantum system

Lu Jian-Qing,Zhang Xiang-Yun,Zhang Shi-An,Jia Tian-Qing,Sun Zhen-Rong,Wang Zu-Geng,

物理学报 , 2009,
Abstract: 运用数值方法研究了超短激光脉冲在多能级系统中的传输特性.当激光脉冲能量相对较弱时,适当的脉冲面积可以实现自感应透明;激光脉冲能量逐渐增强,脉冲将产生分裂.脉冲分裂的基本面积(即脉冲实现稳定传播的最小面积)与二能级系统不同,而是A0=2π/κ,与激发态的能级个数和跃迁偶极矩密切相关.由于分裂和吸收,超短激光脉冲传输了一段距离以后,将演化为一个脉冲宽度更窄、峰值强度更高且面积为A0的超短激光脉冲.
Ultrafast electronic dynamics during femtosecond laser-induced damage in omnidirectional reflector

Sun Hai-Yi,Jia Tian-Qing,Li Xiao-Xi,Xu Shi-Zhen,Feng Dong-Hai,Li Cheng-Bin,Wang Xiao-Feng,Xu Zhi-Zhan,

物理学报 , 2005,
Abstract: The use of optical frequency domain phase conjugation (FDPC) to suppress pulse impairments due to cross-phase modulation (XPM) in optical fiber systems is propo sed. Evolution of Gaussian pulses in the system using midway FDPC is analyzed thoretically and simulated numerically. It is found that pulse waveform impairmen ts induced by XPM can be suppressed effectively by FDPC. The impairments due to group-velocity dispersion and self-phase modulation can be suppressed simultaneously. Suitable initial time delay and pulse chirp of pulses can improve the suppression and compensation for the distortion.
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