Evaluating system behavior through Dynamic Master Logic Diagram (DMLD) modeling

In this paper, the Dynamic Master Logic Diagram (DMLD) is introduced for representing full-scale time-dependent behavior and uncertain behavior of complex physical systems. Conceptually, the DMLD allows one to decompose a complex system hierarchically to model and to represent: (1) partial success/failure of the system, (2) full-scale logical, physical and fuzzy connectivity relations, (3) probabilistic, resolutional or linguistic uncertainty, (4) multiple-state system dynamics, and (5) floating threshold and transition effects. To demonstrate the technique, examples of using DMLD to model, to diagnose and to control dynamic behavior of a system are presented. A DMLD-based expert system building tool, called Dynamic Reliability Expert System (DREXs), is introduced to automate the DMLD modeling process.     

cdma 2000无线传输技术

ｃｄｍａ ２０００是面向下一代移动通信设计的宽带无线技术。它采上层、链路层和物理层三层设计，具有较好的灵活性和可伸缩性，可应用于室内外、步行、车载等多种环境。它实现了从现有ＴＩＡ／ＥＩＡ９５－Ｂ系统到下一代移动通信系统的平滑过渡，同时支持系统的信令协议和消息以及与该系统间的切换。     

A NEW ANALYZING APPROACH TO MODELING SLOTTED MULTIPLE ACCESS SYSTEMS

In this paper, the analyzing approaches proposed by Zhao Dongfeng, et al.(1997) have been extensively studied. The average cyclic times of the slotted multiple access systems are analyzed by using the average cycle method. Analytic formulae for mean values of a successful period and a colliding period and an idle period are derived. The upper bounds of the system throughput with capture effect and collision resolution are provided. Finally, the simulation results of the slotted multiple access channels are given.     

Effective Formal Reduction of Linear Differential Systems

In this paper we present a new method for the formal reduction of linear differential systems. We generalize classical results and concepts and obtain new characterizations of existing notions. Our main result is a generalization of the classical Splitting Lemma. This leads to an algorithm for computing formal invariants and solutions in a more efficient way. Received: March 9, 1999; revised version: September 2, 1999     

Cell design in bacteria as a convex optimization problem

In this paper, we investigate the prediction of the cell composition of bacteria with respect to their medium. By modeling the bacterium as an interconnection of subsystems, the problem is written as a non-smooth convex optimization problem equivalent to a Linear Programming feasibility problem. We then obtain a new method, called Resource Balance Analysis (RBA), predicting the distribution of the available resources in the medium among the various cellular subsystems. Beyond its predictive capability, the proposed approach grasps some fundamental aspects of the bacterium physiology by including a refined model. This method reveals the existence of an intrinsic bottleneck in the system resource distribution of the bacterium, leading to the existence of a structural limitation of its growth rate which can be predicted. RBA is also able to predict the configuration of the metabolic network for a given medium at steady-state regimen which nicely fits the available experimental results for the gram-positive model bacterium Bacillus subtilis.     

GIS技术在水文水资源领域中的应用现状与发展趋势

GIS技术的产生是计算机技术和信息化发展的共同产物,是管理和研究空间数据的技术系统.可以迅速地获取满足应用需要的信息,能以地图、图形或敷据的形式表示处理的蛄果.GIS技术正在广泛地应用于水文水资源领域.本文对GIS技术在水文水资源中的应用情况进行了总结、归纳,并分析了应用GIS的优势及存在同题,进一步预测了其发展趋势.     

Blocking of 3(2 n–k ) Designs

3(2 ^n–2) designs may be divided into two blocks, one of size 2 ^n–1 and the other of size 2 ^n–2 by blocking on one of the defining contrasts and into three blocks of size 2 ^n–2 by blocking on all three defining contrasts. Blocking on an effect which is not a defining contrast gives two blocks of 3(2 ^n–3) runs each. In this paper these methods are applied to 3(2 ^n–k ) designs with twelve or twenty-four points. The designs considered are the 3(2^4–2) and 3(2^5–2) designs with all main effects and all two factor interactions estimable (assuming that higher order interactions are negligible), and saturated main effect plans with twelve points and up to eleven factors.     

Efficient texture analysis for industrial inspection

This paper describes a convolution-based approach to the analysis of images containing few texture classes. Segmentation of foreground and background textures, or detection of boundaries between similarly textured objects, is demonstrated. The application to industrial inspection applications is demonstrated. Near frame-rate performance on low-cost hardware is possible, since only convolution with small kernels is used. A new algorithm to optimize convolution kernels for the required texture analysis task is presented. A key feature of the paper is the industrial readiness of the techniques described.     

Modeling hourly electricity dynamics for policy making in long-term scenarios

Energy policies are often related to the global effort in reducing greenhouse gas emissions through increased use of renewable energies in electricity production. The impact of these policies is usually calculated by energy planning tools. However, the modeling methodologies most currently used are not adequate to simulate long-term scenarios while considering the hourly dynamics of supply and demand.     

An architecture model to support cooperative design for mechatronic products: A control design case

Efficient integration of systems in the mechatronic industry is critical for complex product development and is still challenging. A particular example of this situation can be pinpointed in the development of control software for mechatronic products: design is not carried out in a concurrent way in order to exploit the synergy among domain experts and many “last minute” problems are detected and forcefully solved in the control software domain at an advanced development stage. Unfortunately, industrially applicable research to improve integration in the development process is currently at a stale. This work addresses system architecting introducing a model, a method, and a tool implementation, which aim to help changing this situation by supporting cooperative design, providing usable documentation and improving understanding of the design process by the stakeholders.