Graphical Analysis Techniques Research Articles

DDA

Graphical techniques are becoming more and more popular tools of applied statisticians and data analysts. This growing popularity is due both to the great intrinsic utility of graphic data displays and to the more widespread availability of graphic peripherals to computing systems. Since, however, graphical data analysis techniques are most valuable when used 1) interactively and 2) in conjunction with each other, rapidly shifting and expanding graphic display hardware and software technology has inhibited their full exploitation and utilization. The DDA language “workbench” attempts to minimize the amount of time which a statistician or data analyst must devote to language and machine-dependent considerations of graphical data analysis. This should enable him or her to concentrate on the development, investigation, and utilization of the graphical techniques themselves.

Graphics in business decision making

Mountains of data can be converted into easily digested graphs so that decision makers can grasp the peaks and trends of economic situations and make rapid and confidential decisions. We will study how we can define simple models using a graphic-based Industrial Dynamics system (Forrester of MIT), then interact with them symbionically to obtain graphs of various manufacturing or sales considerations. We will proceed to apply graphic analysis techniques to these graphs in order to produce curves that identify the sensitivities of the analysis, to reinforce confidence in the decision to be made. Finally, we will discuss the progress and the potential of graphics in business decision making.

Graphical analysis and design of limit cycles in autonomous relay control systems†

Abstract An exact graphical analysis and design technique is presented which is based on closed-form expressions for Tsypkin'a infinite summations. The technique is developed from the observations that the closed-form expressions can be written in a compact notation, and that this new notation simplifies the evaluation of Tsypkin'a necessary conditions for the existence of a simple limit cycle. A set of basic analysis curves is derived for several simple 0(s) forms. It is shown that simple paper and pencil computations are often all that are required to construct a design curve for a more general G(s) function.

Hydrogen overpotential on rare earth metals

Hydrogen overpotential measurements have been performed on yttrium and 12 rare earth metals in phosphate buffered phosphoric acid. Tafel constants, β, and exchange current densities, i 0, have been accurately determined by a graphical analysis technique. Correlations between electrochemical and physical properties are discussed.

A Discussion on the Transient Analysis of Coaxial Cables Considering High-Frequency Losses

The physical processes of HF loss are discussed. Two cases in transient analysis for coaxial cables are presented; the first considers skin effect in plated conductors while the second is an analysis based upon an attenuation approximation of the form (frequency) ^m , 0 . A graphical transient analysis technique is described which allows one to easily analyze cables whose losses are due to a combination of physical processes. Generalized curves based upon the (frequency) ^m approximation are presented by which the transient response of a cable can be rapidly evaluated for purposes of engineering design.

Notes on the Teaching of Framed Structures

THIS IS not an essay on the relative merits of the different methods of frame analysis, nor one which goes over method of sections, graphical analysis and other techniques which are adequately dealt with in a score of textbooks. Rather it is an attempt to draw attention to certain simple and fundamental ideas, to show how the student may be introduced to a range of frames in a very short time, to increase his understanding of the way they ‘work’ and also to enable him to solve frame problems by inspection if the geometric relations are easy. The latter is a useful and important examination technique.