Multicommodity Network Expansion under Elastic Demands

We analyze some issues of network design and bandwidth allocation in telecommunication systems with congestible resources. The work is closely related to network monitoring and traffic measurement functions that must be carried out on line, in order to overcome congestion caused by an unfavorable traffic pattern or by a failure. In addition to the traditional use of routing controls, our approach achieves network efficiency with capacity assignment and also imposing variable prices for the consumers. A generalized Benders decomposition method is applied to a mixed integer nonlinear programming formulation of the integrated problem of network design and operation. The method exploits the nature of the continuous subproblem, that is a large-scale convex network flow problem with demands sensitive to commodity prices. Some numerical experience suggests that the method is usefull to address both questions of global optimality and competitive pricing in such systems.     

Photochemically Driven Polymeric Network Formation: Synthesis and Applications

Polymeric networks have been intensely investigated and a large number of applications have been found in areas ranging from biomedicine to materials science. Network fabrication via light‐induced reactions is a particularly powerful tool, since light provides ready access to temporal and spatial control, opening an array of synthetic access routes for structuring the network geometry as well as functionality. Herein, the most recent light‐induced modular reactions and their use in the formation of precision polymeric networks are collated. The synthetic strategies including photoinduced thiol‐based reactions, Diels–Alder systems, and photogenerated reactive dipoles, as well as photodimerizations, are discussed in detail. Importantly, applications of the fabricated networks via the aforementioned reactions are highlighted with selected examples. Concomitantly, we provide future directions for the field, emphasizing the most critically required advances.     

An Annotated Bibliography on Methods for Non-linear least Squares Computations Including Test Problems

An optimal inspection policy will inspect either every item produced or no item when (a) product characteristics are well modeled as iid and (b) overall inspection cost is a sum of individually and identically determined costs for each of the items encountered. This result is widlsly known for special cases such as iid Bernoulli product characteristics with single-sample lot acceptance-sampling plans. We show that the result holds true much more generally and over a much wider class of inspection plans, even when independent inspection errors are possible. We examine the assumptions that lead to all-or-none optimality and discuss the practil:al meaning of all-or-none results to practitioners. Examples are given to demonstrate that both “other” cost structures and “informative” inspections (i.e., lack of independence) can lead to optimal policies that are not of the all-or-none type.     

USB Sensor Network for Industrial Applications

This paper proposes a universal serial bus (USB) solution for sensor networking. First, network architecture has been presented to have, as its primary objective, its integration with existing infrastructure. For this reason, a USB-to-Ethernet gateway has been introduced. Then, many aspects of industrial applications have been considered to realize a suitable solution. Insulation problems and low-cost implementation have been tackled. Working prototypes of each network component have been defined and realized: USB host gateway, USB insulator, and USB hub. Several commercial USB devices can be used as sensors. Finally, some experiments have been carried out: Timing performances, network activities, and power consumption have been tested.     

AMI Computations on C59: Significant Eight- and Nine-Membered Rings

C₅₉ is computed by the AMI method as a particular, experimentally known odd fullerene, 19 isomers being treated. New rules are reported for the pentagon/hexagon pattern, and structures with other types of rings are considered, too. A part of the isomers is derived from the lowest known isomer of C₅₈- The supposed ground-state structure of C₅₉ contains an eight-membered ring, while the next lowest one possesses a nine-membered ring. The C₅₉ ground state exceeds C₆₀ in heat of formation per particle by about 10.4 kJ/mol/atom. The ground-state species should prevail in the C₅₉ equilibrium isomeric mixture even at high temperatures.     

扩展双向联想记忆神经网络及其应用

提出了一种采用δ规则作为学习算法的扩展双向联想记忆神经网络模型，并从理论上证明了其稳定性。该模型克服了现有采用Ｈｅｂｂ规则作为学习算法的联想记忆神经网络对记忆模式有正交性要求和所模式吸引域小的不足。实验结果表明，其联想记忆能力优于目前现有的联想记忆网络。     

神经网络方法及其在语音识别中的应用

讨论了神经网络技术用于汉语语音信号的端点检测，声，韵母分离、非线性特征抽取和大字表识别的方法，描述了系统实现框图并给出了应用实例。     

钛材在海军工程中的应用及需要解决的问题

概括地介绍了国内外海军工程应用钛材的情况,分析了目前存在的问题及解决这些问题的对策。我国钛材产量已达万t水平,合金种类,材料品种规格等已经达到了在海军工程中大量应用的条件。     

C32: Computations of Low-Energy Cages with Four-Membered Rings

Abstract

C₃₂ cages built from four-, five-, six-, and seven-membered rings are computed. The computations are primarily performed with semiempirical quantum-chemical methods (AM1, PM3, SAM1), and altogether 199 cages are optimized. The energetics is further checked through ab initio HF SCF computations with the standard 3-21G basis set, and also by density functional theory at the B3LYP level in the standard 6-31G? basis set. All five levels of theory suggest a D_4d cage (two four-membered rings, eight pentagons, eight hexagons) as the lowest-energy structure. Temperature effects are treated in the terms of partition functions so that the entropy contributions are considered accordingly. The thermodynamic treatment points out five cages significantly populated at high temperatures. At very high temperatures the structure lowest in energy is not the most abundant isomer. There are just six conventional fullerenes C₃₂, built exclusively from pentagons and hexagons, however, only two of them show significant populations at high temperatures. The remaining three relatively stable cages contain at least one four-membered ring. No structure with a heptagon shows a non-negligible concentration at high temperatures. The study suggests that in the non-IPR region the quasi-fullerene cages with four-membered rings can in some cases be more important than the conventional fullerenes built from pentagons and hexagons only.     

C32: Computations of Low-Energy Cages with Four-Membered Rings

C₃₂ cages built from four-, five-, six-, and seven-membered rings are computed. The computations are primarily performed with semiempirical quantum-chemical methods (AM1, PM3, SAM1), and altogether 199 cages are optimized. The energetics is further checked through ab initio HF SCF computations with the standard 3-21G basis set, and also by density functional theory at the B3LYP level in the standard 6-31G* basis set. All five levels of theory suggest a D_4d cage (two four-membered rings, eight pentagons, eight hexagons) as the lowest-energy structure. Temperature effects are treated in the terms of partition functions so that the entropy contributions are considered accordingly. The thermodynamic treatment points out five cages significantly populated at high temperatures. At very high temperatures the structure lowest in energy is not the most abundant isomer. There are just six conventional fullerenes C₃₂, built exclusively from pentagons and hexagons, however, only two of them show significant populations at high temperatures. The remaining three relatively stable cages contain at least one four-membered ring. No structure with a heptagon shows a non-negligible concentration at high temperatures. The study suggests that in the non-IPR region the quasi-fullerene cages with four-membered rings can in some cases be more important than the conventional fullerenes built from pentagons and hexagons only.     

磁性液体旋转密封的关键问题研究进展

磁性液体是一种新型的功能材料, 密封是磁性液体最成功的应用之一。磁性液体密封是一种利用磁场控制的新型流体密封技术, 与其它的密封形式相比, 具有零泄漏、长寿命、高可靠性、能承受高转速与黏性摩擦小等优点, 因此在航空航天、机械工程、精密仪器等领域具有广阔的发展空间和重要的应用价值。本文针对磁性液体在大直径大间隙密封、高速密封与密封液体的应用中出现的关键问题进行了综述, 分析了当前磁性液体在大直径密封、高速密封与密封液体方面存在的主要问题。基于目前的研究成果, 提出了解决磁性液体密封关键问题的方法。最后, 指出大直径密封、高速密封与密封液体是磁性液体密封未来的的重要发展方向, 并总结了磁性液体密封需要进一步研究的热点问题。     

Two C60O Structures and Their Relative Stabilities: AM1 Computations

C₆₀O is studied by means of the AM1 quantum-chemical method. Full geometry optimization of its C_s and C_2v structures, and harmonic vibrational analysis, are employed in the evaluation of the temperature dependence of their relative stabilities. The C_2v structure remains a minor component of the equilibrium gas-phase mixture even at high temperatures.     

Zno Nanowires Network Synthesis and Its Applications on Transfer-Free UV Photodetector

正Horizontally ZnO nanowires and 3D nanowires network were synthesized on dielectric silicon substrate and SiO_2 insulate substrate by catalyst-free CVD(chemical vapor deposition)method.Both the micro structure and the roughness of the substrate surface by the photoetching method and RIE ethingmethod play a significant role on the horizontally ZnO nanowires network growth when the gold     

Tree Network Location Problems With Minimum Separations

We consider the problem of characterizing feasible locations for identical facilities in a tree network when lower bound constraints are imposed on distances between the facilities as well as between each fixed point and the facilities. We first eliminate from the network some fixed points whose associated constraints, are redundant, and then develop a sequential procedure for locating the maximum number of facilities. We relate this maximum number to the consistency of the distance constraints; the resulting information is relevant in solving a certain class of location problems on tree networks.     

广义锥凸映射的Gordan-Farkas型定理及其在优化问题中的应用

讨论几类广义锥凸映射的关系和性质，研究它们的Gordan-Farkas型定理，给出它们在无穷维空间向量最优化问题中的应用，得到强Lagrange对偶等结果     

A Class of Mathematical Programs with Equilibrium Constraints: A Smooth Algorithm and Applications to Contact Problems

We discuss a special mathematical programming problem with equilibrium constraints (MPEC), that arises in material and shape optimization problems involving the contact of a rod or a plate with a rigid obstacle. This MPEC can be reduced to a nonlinear programming problem with independent variables and some dependent variables implicity defined by the solution of a mixed linear complementarity problem (MLCP). A projected-gradient algorithm including a complementarity method is proposed to solve this optimization problem. Several numerical examples are reported to illustrate the efficiency of this methodology in practice.     

Hamilton系统特征值问题的摄动方法及其应用

研究了Hamilton系统特征值的摄动问题，给出了系统特征值和特征函数的摄动展开式。并基于H∞控制系统的性能指标与相关的Hamilton微分方程特征值的关系，利用特征值摄动方法计算参数摄动控制系统的最优H∞性能指标。     

Measurements and Computations of Electric Field Intensity and Power Density

Conversion equations for converting the transmitting power, receiving power, or receiving voltage to electric field intensity and power density are derived and discussed. If the antenna factor, antenna gain, and the cable parameters are known, the electric field intensity or power density at some distance from the transmitting antenna may be determined by means of a specific conversion equation for a given signal frequency. The developed conversion equations may aid the electronics engineers to compute the electric field intensity and power density in a quick way.