Monotone Span Program vs.Linear Code

Monotone span program(MSP) and Linear code(LC) are efficient tools to construct Linear secret sharing scheme (LSSS) for a given access structure.Since the size of an MSP or the length of an LC corresponds to the communicational complexity of an LSSS,one main motivation to study MSPs or LCs is the lower bound for their sizes or lengths.Therefore,it is one of the most important open problems how to efficiently construct an MSP or LC for a given access structure Γ with the smallest sizes or shortest length.Our contributions are:We extend TANG et al.'s result,showing that,for any given access structure Γ,there exists an MSP or an LC to realizeΓ if and only ifa system of quadratic equations has solutions;We utilize the relationship between LCs and MSPs to obtain the greatest lower bound on the row size and the column size of MSPs realizing a given Γ,as well as an upper bound on the column size of MSPs;We give an algorithm to construct an MSP with the smallest sizes.     

时间跨度的选取对数值模拟光脉冲在光纤中传输的影响

提出了利用分步傅里叶方法计算光脉冲在光纤中传输时间跨度的选取方法,给出了正确模拟光脉冲通过不同长度的光纤后光脉冲的变化所要选取的最短的时间跨度,即计算过程中所取的积分上下限之差。在此基础上,对不同的光脉冲在光纤中的传输进行了数值模拟,发现前人提出了超高斯光脉冲在光纤中传输会由于色散而产生脉冲形状扭曲这一结论是错误的,并指出了错误的原因所在。     

Simulation of chaotic synchronization communication system based on incoherent optical feedback and injection

Chaotic communicationis of great interest because ofa potential applications in secure communications andspread spectrumcommunications .Asemiconductor lasersubject to optical feedback is known to have complexdynamic behavior ,and it can produce chaotic wa…     

基于改进人工免疫算法的云计算任务调度

为了提高云计算任务调度效率,提出一种改进人工免疫算法的云计算任务调度方法。首先建立云计算任务调度的数学模型,并以任务总时间最短作为目标函数,然后采用人工免疫算法进行求解,并将粒子群优化算法作为算子嵌入人工免疫算法中,保持种群的多样性,防止局部最优解的出现,最后采用仿真实验对算法的性能进行测试。结果表明,相对于其它算法,改进人工免疫算法减少了任务的完成时间,提高了用户满意度。     

双机容错在医院信息系统中的设计与实现

双机容错是确保医院信息系统正常运转，防止数据丢失的重要技术。现针对目前多数综合性医院HIS系统中所面对的数据备份与安全策略的问题，结合医院的实际情况设计出了一套既实用又可靠的策略，并阐述了双机容错的具体设计与实现方法。     

Adaptive optical design in surface plasma resonance sensor

A double-prism adaptive optical design in surface plasma resonance （SPR） sensor is proposed,which consists of two identical isosceles right-triangular prisms. One prism is used as a component of Kretschmann configuration, and the other is for regulation of the optical path. When double-prism structure is angle-scanned by an immovable incident ray, the output ray will be always parallel with the incident ray and just has a small displacement with the shift of output point. The output ray can be focused on a fixed photodetector by a convex lens. Thus it can be avoided that a prism and a photodetector rotate by 8 and 28 respectively in conventional angular scanning SPR sensor. This new design reduces the number of the movable components, makes the structure simple and compact, and makes the manipulation convenient.     

Reconstruction of three-dimensional coronary arterial dynamics from multi-view angiogram sequences

Since actual cardiac and arterial motion is non-rigidand non-uniformbothin space andinti me[1],the quan-tification of dynamic 3-Dcurves with 2-D projections isinaccurate and sensitive to view angles . Ruan[2]andPuentes[3]reconstructed 3-D arterial centerl…     

Statics characteristics of two Bose-Einstein condensate dark solitons trapped in an optical lattice

The statics characteristics of two coupled Bose-Einstein condensate （BEC） dark solitons trapped in an optical lattice are investigated with the variational approach. It is found that the interaction between a ‘kink＇ and an ‘anti-kink＇ with opposite phase gradients is effectively repulsive, and the optical lattice can be controllably used to produce a pair of static BEC dark solitons. Its effect depends on the initial location of the BEC dark solitons, the lattice amplitude and wave number.     

Effective factors of CD monitoring technique based on the narrow-band electrical power detection

It is known that the tolerable residual chromatic dis-persionfor 40 Gb/s transmission systemis only 60 ps/nmor even less[1],and the online chromatic dispersionvaries due tofactors like network reconfigurations ,tem-perature fluctuation,laser ' s wavelengt…     

Robust three, dimensional surface contouring method with digital holography

Nowadays digital holography (DH) is applied to thethree di mensional surface contouring,duetoits non-con-tact advantage[1-5].Moreover ,when a lensless Fouriertransform arrangement with the short-coherence lightsourceis employed in a DHrecording system,not…