Two-dimensional inverse problem of diffusion tomography: the approach applicable for small inclusions

A method for solving the two-dimensional inverse problems of optical diffusion tomography is proposed. The method is especially designed for the imaging of small inclusions embedded in the backgrounds of strongly scattering media. Numerical simulations show that the results are stable with respect to external noise at the boundary of the sample. The location of an inclusion is obtained with an accuracy of the order of several photon transport mean-free paths in the medium in cases both with and without noise in the scattering data used for the solution of the inverse problem.     

Optimization suggestions for instrument‐cluster information using displays

Abstract— Suggestions are proposed to improve the way information is presented with heads‐down displays (HDDs) to optimize the information and potentially reduce the duration and frequency of scans necessary by the driver to read the information. Using color as a secondary channel of information on vehicle meters could reduce scan frequency by increasing awareness in driver' s peripheral vision. Only showing relevant portion of scales can reduce the overall necessary area for display information and possibly reduce the number of fixations necessary to read the information from that area. Larger displays can be optimized with same considerations as other displays, butthe size creates an easier opportunity to be filled with information in a way that ends up distracting the driver. Elaborate or complex graphics that emphasize the full abilities of larger displays are probably best limited to non‐driving conditions. Color displays also have the potential benefit of reconfigurability, which could have a significant impact on how information is presented. Reconfiguration concepts suggested include only showing information of interest, font‐size adjustment, and using GPS information to augment speed information based on traffic, time of day, and weather conditions.     

Live Distributed Objects: Enabling the Active Web

Distributed computing has lagged behind the productivity revolution that has transformed the desktop in recent years. Programmers still generally treat the Web as a separate technology space and develop network applications using low-level message-passing primitives or unreliable Web services method invocations. Live distributed objects are designed to offer developers a scalable multicast infrastructure that's tightly integrated with a runtime environment.     

Using SEEK for multichannel pattern recognition

The author's work on computerized analysis of the 2-channel, 24-hr electrocardiogram has previously resulted in the development of multichannel signal processing systems that learn by observation. A new tool for implementing such algorithms is described: the pattern recognition language SEEK. Programs written in SEEK build a knowledge base containing treelike data structures, each of which stores acquired information about a particular multichannel waveform. Input data are interpreted by performing an efficient parallel evaluation of the structures in the knowledge base. The work is applicable to a wide variety of pattern recognition problems that arise in medical signal processing. The approach is illustrated with examples drawn from ECG analysis.     

利用Agent实现新的电网后备保护

提出了一种新的利用Agent实现的电网后备保护系统.它优于由传统第Ⅲ段保护构成的后备保护系统,动作更快而且更具有选择性,其自检和纠错能力能减少保护的不正确动作.阐述了:Agent的基本思想,分析了Agent保护通信特点,提出了基于Agent的电网后备保护系统原理结构、算法和IP通信实现,利用电力和通信系统同步仿真平台EPOCHS在一简单电力系统上对所提出的保护系统进行了仿真实现,证明了所提出的方法的有效性.     

Parametric vibrations of long cylindrical shells subject to transverse static load

The problem of parametric vibrations of long circular cylindrical shells prestressed by a uniformly distributed transverse static load has been considered. The static equilibrium position is found as a result of the solution of a nonlinear problem, where the factors contributing to nonlinearity include flattening of circular cross sections during deformation, stretching of elastic axis and hardening elastic foundation. Small amplitude forced parametric vibrations about the static position are then studied. The solution of the nonlinear parametric vibration problem in the absence of the static load is also shown.     

Vibration of composite-material cylindrical shells with ring and/or stringer stiffeners

Free vibration is analyzed for thin-walled circular cylindrical shells constructed of composite materials and provided with ring and/or stringer stiffeners. Numerical results are presented for graphite-epoxy shells: unstiffened and stiffened with rings only, stringers only, and both rings and stringers.