The mechanical characteristics of rock salt have an important influence on the safety of the salt cavity. The acoustic emission (AE) technique was used to analyze the generation of microcracks in rock salt under uniaxial compression condition. By monitoring acoustic emission in whole process of stress strain curve under uniaxial compression test, the damage characteristic of rock salt is obtain...

this review provides the basic principle and rational for roc analysis of rating and continuous diagnostic test results versus a gold standard. derived indexes of accuracy, in particular area under the curve (auc) has a meaningful interpretation for disease classification from healthy subjects. the methods of estimate of auc and its testing in single diagnostic test and also comparative studies...

We present a parameter estimation approach for LuGre friction model based on chain-code method. The approach employs shape characteristics of friction force-displacement curve to measure the similar degree, here it is Euclidean distance, between the original curve and simulated curve. Once the Euclidean distance is smaller than the given error, we can consider the final dynamic parameters are t...

We show how four-bar linkages can be designed using non-convex optimization techniques. Our generative design software takes as input a curve that needs to be reproduced by a four-bar linkage and outputs the best assembly that approximates this curve. We model the problem using quadratic constraints and show how redundant constraints help to solve the problem. We also provide an algorithm that ...

We present an analysis of eleven years of Strömgren by photometry of the red semiregular variable star AI Aurigae. An early period determination of 63.9 days is confirmed by the long-term light curve behaviour. The light curve shows semi-regular changes with a mean period of 65 days reaching an amplitude of 0. m 6 in some cycles. The b − y colour changes perfectly parallel the V light curve, su...

Elliptic curve point multiplication kP on an elliptic curve is required in every elliptic curve cryptosystem. The operation can be significantly accelerated by using a special type of elliptic curves called the Koblitz curves and by representing the integer k in τ -adic nonadjacent form (τNAF). Hardware-friendly modifications of existing τNAF conversion algorithms are presented and an efficient...

Curve tracers draw a graph of current versus voltage of electronic devices. They are usually used to plot the characteristic curves of transistors (see Fig. 1a), but can also display diode curves (see Fig. 1b), and the v-i characteristics of other two and threeterminal devices. A family of curves is drawn, each curve differing from the next by a change in a controlling quantity (or parameter), ...

Receiver Operating Characteristic (ROC) curve is used to assess the discriminatory power of credit rating models. To identify the optimal threshold on the ROC curve, the iso-performance lines are used. The ROC curve and the iso-performance line assume equal classification error costs and that the two classification groups are relatively balanced. These assumptions are unrealistic in the applica...