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901.
The meaning of prevention has changed as new applications of the concept have appeared. Ideas presented in eleven different conceptual frameworks are compared. Identification of the frameworks took place through searches in databases and relevant literature. Five are general by nature, while six relate to injuries and accidents. All are supported by just a few parameters, the time dimension being the most prominent. Compatibility was established on three additional dimensions: level (individual, organizational or societal); direction (“bottom-up” or “top-down”); and in relation to the trichotomy “host-agent-environment”. An attempt to synthesize all these dimensions into one general model of accident and injury prevention is presented. 相似文献
902.
Segmentation of anatomical structures in radiological images is one of the important steps in the computerized approach to
the bone age assessment. In this paper a method dealing with correct location of the borders in the epi-metaphyseal regions
of interest is described. The well segmented bone structures are obtained utilizing the Gibbs random fields as the first segmentation
step; however this method does not prove to be adequate in the correct outline of other tissues in the epi-metaphyseal area.
In order to correct delineation of cartilage in this region, the second segmentation step utilizing the active contours serving
as a post-segmentation edge location technique is applied. Controlling of tension and bending of the active contour requires
a set of weights in the energy functional to be set. To adjust the weights and to initially test the methodology a model of
region of interest containing three different anatomical structures corrupted with Gaussian noise has been designed. Combined
methodology of Gibbs random fields and active contours with the final set of weights was applied to 200 regions of interest
randomly selected from 1100 left hand radiographs. A meaningful improvement in terms of ultimate contour location and smoothing
has been observed in regions with cartilage or bone convexity developed near the bottom region of the epiphysis.
相似文献
Arkadiusz GertychEmail: |
903.
Ewa Ziemba Tomasz Papaj RafaŁ Żelazny Maria Jadamus-Hacura 《Journal of Computer Information Systems》2016,56(2):156-167
This research focuses on the critical success factors (CSFs) of e-government. Its main purposes are to (1) explain the development of the methodology of CSFs for e-government, (2) present the practical implementation of this methodology in Polish public administration, and (3) to assess the preliminary results of the practical implementation. The article continues as follows. First, the article clarifies the concept of e-government and the CSFs for e-government. Second, the methodology of CSFs for e-government is explained in detail. Third, the article presents the preliminary results of the practical implementation of this methodology in Poland, at the local and state level of government. The article concludes with a discussion on research findings, implications, and avenues for further research. This work contributes to extant research by showing a holistic approach to the CSFs for e-government. 相似文献
904.
Ewa Swiercz 《Advances in Engineering Software》2012,45(1):28-41
In this paper a neural detector of internal parameter changes in a stationary, non-linear SISO dynamic system is considered. A dynamic system is usually described by an input-output relation or by a set of state equations. Each change of parameter values creates a new non-nominal model of a dynamic system (sometimes with different values of parameters, sometimes with different structure and different values of parameters). Thus the detection of parameter changes can be formulated as a multi-model classification. The LVQ (Learning Vector Quantisation) neural network has been proposed as a classifier. Selected aggregated properties of discrete wavelet decomposition coefficients of the system output have been chosen as the inputs of the LVQ classifier. The output of the classifier points out the current model. The proposed approach to classification can be adopted as a fault detection method where faults are represented by changes of values of internal parameters of a system. The algorithm has been evaluated on the example of a non-linear fluid system with a non-ideal pipe which internal state is characterised by one value of a parameter, chosen from the known set. 相似文献
905.
Ewa Dostatni Jacek Diakun Damian Grajewski Radosław Wichniarek Anna Karwasz 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2016,20(11):4347-4361
In this paper, the application of multi-agent system to support decision-making process in design for recycling is presented. The design for recycling term is highlighted either as the design problem or from the point of view of regulations. The structure of agent system supporting the designer during the design process is showed. The basis of special kind of product model, that is the extension of standard 3D product model, called recycling-oriented product model, is described. The example results of analysis, based on real household appliance model, are presented. 相似文献
906.
Ewa Ratajczak-Ropel 《控制论与系统》2013,44(5-6):296-316
ABSTRACTIn this paper, a rank-based nonparametric statistical test for measuring the effect of cooperation between optimization agents solving the multi-mode resource-constrained project scheduling problem is presented. To solve this NP-hard optimization problem, different methods are applied including population- and agent-based approaches. One of them is a team of asynchronous agents composed of multiple optimization agents, management agents, and common memories, which through interactions produce solutions of hard optimization problems. Optimization agents represent different methods including local search, path relinking, or tabu search. Interactions are managed through various cooperation strategies based on applying heuristics, reinforcement learning, or population learning. 相似文献
907.
Dorota Mozyrska Ewa Girejko Ma?gorzata Wyrwas 《Computers & Mathematics with Applications》2011,62(9):3642-3647
In this paper, viability results for nonlinear fractional differential equations with the Riemann-Liouville derivative are proved. We give a necessary condition for fractional viability of a locally closed set with respect to a nonlinear function. 相似文献
908.
ABSTRACTThis study investigates the role of employees’ age in the perception of problems during enterprise systems (ES) adoption and use. The analysis of data gathered from Polish ES practitioners suggests that ability to perceive the broad impact of technology decreases with age. The findings also illustrate that younger employees recognize root problems among technical issues, while older practitioners focus on impediments associated with people and emphasize the role of competence and training as root causes. 相似文献
909.
Ewa?Gajda-ZagórskaEmail author Robert?Schaefer Maciej?Smo?ka Maciej?Paszyński David?Pardo 《Natural computing》2015,14(3):355-374
This paper focuses on the application of hp hierarchic genetic strategy (hp–HGS) for solution of a challenging problem, the inversion of 3D direct current (DC) resistivity logging measurements. The problem under consideration has been formulated as the global optimization one, for which the objective function (misfit between computed and reference data) exhibits multiple minima. In this paper, we consider the extension of the hp–HGS strategy, namely we couple the hp–HGS algorithm with a gradient based optimization method for a local search. Forward simulations are performed with a self-adaptive hp finite element method, hp–FEM. The computational cost of misfit evaluation by hp–FEM depends strongly on the assumed accuracy. This accuracy is adapted to the tree of populations generated by the hp–HGS algorithm, which makes the global phase significantly cheaper. Moreover, tree structure of demes as well as branch reduction and conditional sprouting mechanism reduces the number of expensive local searches up to the number of minima to be recognized. The common (direct and inverse) accuracy control, crucial for the hp–HGS efficiency, has been motivated by precise mathematical considerations. Numerical results demonstrate the suitability of the proposed method for the inversion of 3D DC resistivity logging measurements. 相似文献
910.
Ekaterina A. Mikhaleva Igor N. Flerov Andrey V. Kartashev Mikhail V. Gorev Maxim S. Molokeev Evgeniy V. Bogdanov Vitaliy S. Bondarev Leonid N. Korotkov Ewa Rysiakiewicz-Pasek 《Journal of Materials Science》2018,53(17):12132-12144
A study of heat capacity, thermal dilatation, susceptibility to hydrostatic pressure, permittivity and polarization loops was carried out on NH4HSO4–porous glass nanocomposites (AHS?+?PG) as well as empty glass matrices. The formation of dendrite clusters of AHS with a size, dcryst, exceeding the pore size was found. An insignificant anisotropy of thermal expansion of AHS?+?PG showing statistically uniform distribution of AHS with random orientations of nanocrystallites over the matrix was observed. The effect of internal and external pressures on thermal properties and permittivity was studied. At the phase transition P-1???Pc, a strongly nonlinear decrease in the entropy ΔS2 and volume strain (ΔV/V)T2 was observed with decreasing dcryst. The linear change in temperatures of both phase transitions P-1???Pc???P21/c under hydrostatic pressure is accompanied by the expansion of the temperature range of existence of the ferroelectric phase Pc, while this interval narrows as dcryst decreases. 相似文献