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The development of studies on estimating the accuracy of the Earth’s modern global gravity models in terms of the spherical harmonics of the geopotential in the problematic regions of the world is discussed. The comparative analysis of the results of reconstructing quasi-geoid heights and gravity anomalies from the different models is carried out for two polar regions selected within a radius of 1000...
A typical trade-off in decision making is between the cost of acquiring information and the decline in decision quality caused by insufficient information. Consumers regularly face this trade-off in purchase decisions. Online product/service reviews serve as sources of product/service related information. Meanwhile, modern technology has led to an abundance of such content, which makes it prohibitively...
This paper is the article which researches the control algorithm applied to servo system of antenna sub-reflector, the main control algorithm is fuzzy sliding mode control algorithm. This paper first introduces the idea of fuzzy-sliding mode algorithm, then describes the background knowledge about applying to the antenna sub-reflector. The main content of this paper is simulation and comparative analysis,...
This paper has contrasted the separation accuracy of three-point method and approximate three-point method in rotational error. And further analysis the sensitivity of the sensor installation error by two different measurement methods. Simulation results show that the separation accuracy in both roundness error and rotational error by three-point method is higher than two-point method. Approximate...
Based on Vague set,an integrative evaluation method for the stability classification of surrounding rock was presented. The principle and representation method about Vague set, score function of evaluation method were introduced, and then the evaluation index system for the stability classification of surrounding rock is put forward, the simple dependent degree is introduced to determine the weight...
The problem of the low efficiency of the existing spatial interpolation algorithm for hydro meteorological information is discussed and two fast interpolation algorithms based on the conventional Thiessen polygon method was proposed in this paper: improved Thiessen polygon method and self-adaptive Thiessen polygon method. Studies of the Luan River Basin had shown that the self-adaptive Thiessen polygon...
Shrinkage error will impact the results obtained from the observation data when studying subsidence by the method of similar material simulation experiment. Using digital industrial close-range photogrammetry system in the experiment, high-precision observational data is collected. By comparative analysis on the subsidence of the points at different locations, we obtained the distribution law of shrinkage...
This paper compares four commonly used fuzzy analytical methods for remote sensing digital image classification, i.e. fuzzy c-means, semi-supervised fuzzy cluster labeling, fuzzy nearest neighbor, and object-oriented fuzzy classifiers. Merits and weak points of each method were examined through a case study with a multispectral high-resolution airborne digital image of urban settings. Results showed...
Statistical shape models (SSMs) have been used widely as a basis for segmenting and interpreting complex anatomical structures. The robustness of these models are sensitive to the registration procedures, i.e., establishment of a dense correspondence across a training data set. In this work, two SSMs based on the same training data set of scoliotic vertebrae, and registration procedures were compared...
In this work, the results of the comparative analysis of possibilities piecewise-polynomial local bases on three parameters are shown: by quantity of indispensable operations, by efficiency of compression of the information and by error.
Cancelable biometric systems are gaining in popularity for use in person authentication for applications where the privacy and security of biometric templates are important considerations. A variety of approaches have been proposed in the literature. In this work, we have chosen two (a registration based and a registration free) techniques and performed a comparative study focusing on template representation...
In this paper, comparative analysis is presented of our three 3D structure-based approaches for the efficient retrieval of protein molecules. All approaches rely on the 3D structure of the proteins. In the first approach, the Spherical Trace Transform is applied to protein 3D structures in order to produce geometry based descriptors. Additionally, some biological properties of the protein are taken,...
In this paper we present a comparative analysis of the predictive power of two different sets of metrics for defect prediction. We choose one set of product related and one set of process related software metrics and use them for classifying Java files of the Eclipse project as defective respective defect-free. Classification models are built using three common machine learners: logistic regression,...
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