A bulk arrival queueing model with fuzzy parameters and varying batch sizes

This paper develops a nonlinear programming approach to derive the membership functions of the steady-state performance measures in bulk arrival queueing systems with varying batch sizes, in that the arrival rate and service rate are fuzzy numbers. The basic idea is based on Zadeh’s extension principle. Two pairs of mixed integer nonlinear programs (MINLP) with binary variables are formulated to calculate the upper and lower bounds of the system performance measure at possibility level α. From different values of α, the membership function of the system performance measure is constructed. For practice use, the defuzzification of performance measures is also provided via Yager ranking index. To demonstrate the validity of the proposed method, a numerical example is solved successfully.     

Spacetime tangent bundle with torsion

It is demonstrated explicitly that the bundle connection of the Finslerspacetime tangent bundle can be made compatible with Cartan's theory of Finsler space by the inclusion of bundle torsion, and without the restriction that the gauge curvature field be vanishing. A component of the contorsion is made to cancel the contribution of the gauge curvature field to the relevant component of the bundle connection. Also, it is shown that the bundle manifold remains almost complex, and that the almost complex structure can be made to have a vanishing covariant derivative if additional conditions on the torsion are satisfied. However, the Finsler-spacetime tangent bundle remains complex only if the gauge curvature field vanishes.     

A Krasnosel’skii-type result for planar sets starshaped via orthogonally convex paths

A Krasnosel’skii-type theorem for compact sets that are starshaped via staircase paths may be extended to compact sets that are starshaped via orthogonally convex paths: Let S be a nonempty compact planar set having connected complement. If every two points of S are visible via orthogonally convex paths from a common point of S, then S is starshaped via orthogonally convex paths. Moreover, the associated kernel Ker S has the expected property that every two of its points are joined in Ker S by an orthogonally convex path. If S is an arbitrary nonempty planar set that is starshaped via orthogonally convex paths, then for each component C of Ker S, every two of points of C are joined in C by an orthogonally convex path. Communicated by Imre Bárány     

乘子猜想在n=5n_1时的一些结果

用［１］中的方法，我们得到乘子猜想在ｎ＝５ｎ１情形时的一些新结果，对此情形下的ＭａｃＦａｒｌａｎｄ的结论（见［２］）作了较大的改进．     

Effect of addition of La2O3 in the grain boundaries of a material based on BaTiO3

Results of an impedance study of capacitors of a material based on BaTiO₃ with variable concentrations of La are presented. It is observed that variation in tanδ is related to variation in covalency of the added La at the grain boundaries. The tanδ is temperature dependent. The discussion brings out that added La controls the electron density at the grain boundaries.     

Directionally differentiable multiobjective optimization involving discrete inclusions

This paper is devoted to multiobjective optimization problems involving discrete inclusions. The objective functions are assumed to be directionally differentiable and the domination structure is defined by a closed convex cone. The directional derivatives are not assumed to be linear or convex. Several concepts of optimal solutions are analyzed, and the corresponding necessary conditions are obtained as well in maximum principle form. As an application of the main results, a maximum principle is also derived for multiobjective optimization with extremalvalue fucctions involving discrete inclusions.The authors are indebted to the referee for detailed comments.The paper was written while the second author was visiting the laboratory of Prof. S. Suzuki, Department of Mechanical Engineering, Sophia University, Tokyo, Japan.     

格的内蕴拓扑与完全分配律

本文以Ｓｃｏｔｔ拓扑，Ｚａｒｉｓｋｉ拓扑，区间拓朴等刻划了完全分配律；获得了格的特殊元的存在性与区间拓扑连通性等之间的众多制约关系，给出了若干应用实例和重要反例．     

Some remarks on orders of projective planes,planar difference sets and multipliers

In this paper we investigate how finite group theory, number theory, together with the geometry of substructures can be used in the study of finite projective planes. Some remarks concerning the function v(x)= x ² + x + 1are presented, for example, how the geometry of a subplane affects the factorization of v(x). The rest of this paper studies abelian planar difference sets by multipliers.Partially supported by NSA grant MDA904-90-H-1013.     

Connectedness of super efficient solution sets for set-valued maps in Banach spaces

In this paper, we study the connectedness of the super efficient solution sets in convex vector optimization for set-valued maps in Banach spaces.     

公理A自同态的统计性结果（英文）

本文对公理A自同态建立了中心极限定理和大偏差估计，并且复习了已知的有关统计性结果。