Modeled and measured instruction fetching performance forsuperscalar microprocessors

Instruction fetching is critical to the performance of a superscalar microprocessor. We develop a mathematical model for three different cache techniques and evaluate its performance both in theory and in simulation using the SPEC95 suite of benchmarks. In all the techniques, the fetching performance is dramatically lower than ideal expectations. To help remedy the situation, we also evaluate its performance using prefetching. Nevertheless, fetching performance is fundamentally limited by control transfers. To solve this problem, we introduce a new fetching mechanism called a dual branch target buffer. The dual branch target buffer enables fetching performance to leap beyond the limitation imposed by conventional methods and achieve a high instruction fetching rate     

功率器件、电路和系统用的计算机辅助设计技术的进展

最近10年,计算机辅助设计技术(TCAD)的应用已在工业界和学术界普及。计算机硬件和软件迅猛发展和数值算法用的物理模型的精度、速度和鲁棒性显著提高,使TCAD作为晶片加工和计量的补充实验方法,成为降低成本的有效技术。     

A control model for an insurance company

The activity of an insurance company with a reinsurance condition system is modeled on an infinite time interval. Payment times and sums insured are random. The amount of money replenished is selected as a control parameter. The task is to minimize the average insurance payment per unit time, thus optimizing investments.Translated from Kibernetika i Sistemnyi Analiz, No. 6, pp. 172–176, November– December 2004.This revised version was published online in April 2005 with a corrected cover date.     

Election security: Perception and reality

Voters' trust in elections comes from a combination of the mechanisms and procedures we use to record and tally votes, and from confidence in election officials' competence and honesty. Electronic voting systems pose considerable risks to both the perception and reality of trustworthy elections.     

Synchronized world embedding in virtual environments

We introduce a novel distributed approach that lets users copy a given CVE section and keep it consistent with all its other copies and its original CVE area. Although 3D world modeling tools such as Alias' Maya and Discreet's 3DS Max already use object embedding, our method is the first to introduce it in a functioning CVE system. We also expand the traditional object-embedding concept by introducing a mutual synchronization function between the source and destination worlds. The mutual synchronization scheme propagates events $such as changes in an object's color, shape, or position - to other copies of a world. This synchronized world embedding thus offers a new way to expand worlds. Our method is built on existing CVE functionality, which lets us deploy it without significantly interfering with existing CVE designs. We've also altered the method so that it's usable when consistency needs are more relaxed.     

高压电动机过热保护整定计算研究

通过对高压电动机起动过程中电气参数变化的研究,提出高压电动机过热保护的整定计算方法.     

Electrostatic actuation of three-dimensional MEMS mirrors using sidewall electrodes

We propose and demonstrate electrostatic sidewall-electrodes actuation of three-dimensional (3-D) microelectromechanical systems (MEMS) gimbal mirrors. The linearity of the mirror angle dependence on actuation voltage is improved with the sidewall-electrodes actuation. In addition, the undesired spring-softening effect commonly found in electrostatic actuation, where the mirror resonance frequency decreases with increased tilt angle, is significantly reduced. Sidewall actuation enables superior performance of 3-D MEMS mirrors including large pull-in angles, reduced actuation voltages, improved device reliability, and fast switching times.     

Surface degradation of polyamide nanocomposites caused by partial discharges using IEC (b) electrodes

Partial discharge (PD) degradation of polyamide both without nanoscale fillers (nanofillers) and with 2,4 and 5 wt% additions of nanofillers was investigated. Such materials were subjected to PDs using the IEC (b) electrodes for evaluation. Comparisons were made as to the surface roughness observed by scanning electron microscopy and atomic force microscopy. It was found that the change in the surface roughness is far smaller in specimens with nanofillers than those without nanofillers, and that the 2 wt% addition is sufficient for improvement of the surface roughness. Furthermore, it was elucidated that the difference of surface roughness of the degraded area due to PDs among the specimens originates from the difference in their crystalline structures. These results indicate that polyamide nanocomposite is more resistance to PDs than polyamide without nanofillers.     

Deformation of composites with physically nonlinear matrix

Summary. A method and an algorithm for determining the effective deformational properties of granular material with a physically nonlinear matrix and linearly elastic inclusions are elaborated based on the stochastic differential equations of the physically nonlinear theory of elasticity. Their transformation to integral equations and the application of the method of conditional moments reduce the problem to a system of nonlinear algebraic equations, whose solution is constructed by the iteration method. The deformation diagrams as functions of the volume content of inclusions are investigated.     

Synthesis of a Conceptual Model of a Subject Domain. Characteristic Features of Modeling Complex Systems

A solution is given to the urgent problem of high-efficiency control of complex hierarchical distributed integrated industrial complexes by developing a unified functional target approach to synthesizing their control systems utilizing information technologies and the creation of means for constructing a conceptual model of the subject domain.