大规模光电混合神经网络中的可编程拓扑重构

提出了一种在大规模光电混合神经网络系统实现可编程拓扑重构的有效方法，文中介绍了这种方法的原理，运用技术以及采用这种方法在已有的ＮＰ１０２４光学／数字神经网络处理器中运行单层反馈型和多层前馈型等不同网络拓扑结构的实验结果。     

Kähler Surfaces of Positive Scalar Curvature

We construct Kähler metrics of positive scalar curvature on almost all blown-up ruled surfaces of arbitrary genus. The metrics have an explicit form on ruled surfaces blown up at most twice successively from a minimal model. Our surfaces are generic in the sense that they make up a dense set in the deformations of a given ruled surface.     

组合计数的群论与计算机方法

本文综述组合数学和图论中解决计数问题的群论与计算机方法及其最新发展。传统的计数方法得到有限的计数公式或递推公式等，然而许多复杂的问题很难得到有限的表达式，即使能得到，公式也往往非常复杂。由于计算机技术的发展不仅使复杂的计数公式有了实际意义，而且可以设计恰当的计算方法进行数值计算，使计数问题有更为广阔的发展领域。另一方面，为了计算不同构的图或组合结构，最有效的方法是群论方法，因此把群论方法与计算机方     

Underwater CCD cameras for PIV flow mapping

Accurate estimation of the forces imposed on offshore structures due to wave and current loading has become more critical due to the introduction of floating production platforms. Work being carried at both Edinburgh and Glasgow Universities aims to measure these effects by force transducer measurements and Particle Image Velocimetry (PIV). A multiple CCD array system is presented which can directly measure accelerations and hence forces acting on offshore structures.     

Mechanism and nonlinear dynamics of an oscillating chemical reaction

A mechanism and a model of a ferroin-catalyzed oscillating chemical system are descrined. This reaction presents an excellent example of a far-from-equilibrium system that forms spatial and temporal dissipative structures. The model shows that while the well-stirred system has a unique and stable stationary state, the same reagent spread in a thin layer may form complex spatiotemporal paterns. Stationary periodic patterns of both small and large amplitude, standing waves, and inhomogeneous chaotic oscillations are found in the model.     

Indefinite preference structures and decision analysis

It always takes time for people to digest information and make judgments. The decision maker's preference is not always clear and stable when decision analysis and decision making are performed. In this paper, we introduce a generalized preference structure to cope with indefinite preferences. We describe its general properties, its implication on value function representation, its solution concepts, and methods for obtaining the solutions.This research has been partially supported by NSF Grant No. IST-84-18863. The authors are grateful to Dr. D. J. White for his helpful comments on a previous draft.