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1.
Richardson C.H. Schafer R.W. 《IEEE transactions on pattern analysis and machine intelligence》1991,13(4):365-369
A theoretical lower bound on the number of points required in the decomposition of morphological structuring elements is described. It is shown that the decomposition of an arbitrary N -point structuring element will require at least [3 ln N /ln 3]points. Using this lower bound it is possible to find the optimal decompositions (in terms of the minimum number of unions or the minimum number of points) for all one-dimensional connected line segments. L -dimensional rectangles may be decomposed by optimally decomposing the L one-dimensional line segments that describe the rectangle 相似文献
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Burkhard Schafer 《Datenschutz und Datensicherheit - DuD》2010,34(8):535-538
As readers of this journal will of course know, the Zugangserschwerungsgesetz has caused considerable and often very profound
debate in Germany about the limits of legal and technological interference with the freedom of access to information, culminating
in the temporary refusal of the President to sign the law into action. In the UK by contrast, a core aspect of this law, the
technical prevention of access to sites hosting illegal content by ISPs, was introduced through the so called “Cleanfeed system”
as early as 1996, with little or no public debate, and bypassing by and large all parliamentary procedure and scrutiny. This
article has a threefold aim: First, it gives a brief account of the history and implementation of the UK Cleanfeed system1;
second, it explains some of its more unusual aspects by putting them into the historical and constitutional context of policing
in the UK, and third, it highlights those experiences made with the system that are of direct relevance for the German discussion. 相似文献
4.
Geometrically non-linear behavior of structural systems with random material property: An asymptotic spectral stochastic approach 总被引:1,自引:0,他引:1
M. Tootkaboni L. Graham-Brady B.W. Schafer 《Computer Methods in Applied Mechanics and Engineering》2009,198(37-40):3173-3185
An asymptotic spectral stochastic approach is presented for computing the statistics of the equilibrium path in the post-bifurcation regime for structural systems with random material properties. The approach combines numerical implementation of Koiter’s asymptotic theory with a stochastic Galerkin scheme and collocation in stochastic space to quantify uncertainties in the parametric representation of the load–displacement relationship, specifically in the form of uncertain post-buckling slope, post-buckling curvature, and a family of stochastic displacement fields. Using the proposed method, post-buckling response statistics for two plane frames are obtained and shown to be in close agreement with those obtained from Monte Carlo simulation, provided a fine enough spectral representation is used to model the variability in the random dimension. 相似文献
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Burkhard Schafer 《Datenschutz und Datensicherheit - DuD》2016,40(9):592-597
In March 2016, the UK Government put the Investigatory Powers Bill before Parliament. The new law, if enacted, will considerably increase the powers of law enforcement and security services regarding mass data retention, mass surveillance and mass hacking. This raises considerable concerns not just about the content of the Bill and its impact on privacy, but also about the method of its enactment and the ever diminishing parliamentary and judicial scrutiny of surveillance legislation in the UK. 相似文献
8.
Fundamentals of electrosorption on activated carbon for wastewater treatment of industrial effluents 总被引:17,自引:0,他引:17
The potential of electroadsorption/desorption on activated carbon for waste water treatment of industrial effluents is studied. Adsorption isotherms of hydrophobic differently charged model substances on activated carbon were measured in order to obtain specific information about the influence of the charge (+1,–1 and 0) on the adsorbability of comparable, aromatic species and the influence of the bed potential on the adsorption equilibria. In all these cases the adsorption equilibria show a dependence on applied potential in electrolyte of approximately 1m ionic strength. With electrosorption from aqueous solution, a fivefold enhancement of the concentration in one potential controlled adsorption/desorption cycle is achievable. The use of the solvent methanol instead of water for desorption allows for a concentration enhancement by a factor of hundred in the desorptive step. The adsorption capacity of the activated carbon changes only slightly with cycle number. Two cell designs for the performance of potential controlled adsorption/desorption cycles on the large scale are discussed. 相似文献
9.
Schafer T. Eichberg M. Haupt M. Mezini M. 《IEEE transactions on pattern analysis and machine intelligence》2006,32(9):753-768
In this paper, we discuss a set of functional requirements for software exploration tools and provide initial evidence that various combinations of these features are needed to effectively assist developers in understanding software. We observe that current tools for software exploration only partly support these features. This has motivated the development of SEXTANT, a software exploration tool tightly integrated into the Eclipse IDE that has been developed to fill this gap. By means of case studies, we demonstrate how the requirements fulfilled by SEXTANT are conducive to an understanding needed to perform a maintenance task 相似文献
10.
Bloss P. Steffen M. Schafer H. Eberle G. Eisenmenger W. 《Dielectrics and Electrical Insulation, IEEE Transactions on》1996,3(3):417-424
In the present paper, heat wave (LIMM) and pressure step (PPS) measurements of the spatial polarization and electric field distributions in nonuniformly thermally poled α-PVDF and Teflon FEP films are reported. The spatial distributions obtained by the two methods are compared over the entire thickness range, and a satisfactory agreement is found. For PVDF the results of both methods are in accordance with literature data for similarly poled specimens of similar material, the so-called `thermal profile', a polarization peak near the anode. Furthermore, in the LIMM experiments we found a small peak near the cathode, which can be explained by a positive compensation charge layer extending ≈2 μm in depth. For the first time, LIMM spectra of FEP are published. The space charge distribution in the FEP sample is nearly homogeneous inside the sample. Near the anode side an accumulation of negative charges appear. Near both surfaces a positive compensation charge was found with a thickness of ~1 μm. It is demonstrated that by means of our deconvolution the spatial distribution can be determined simultaneously with two thermal parameters, the diffusivity of the sample material and the heat transfer coefficient between sample and sample holder 相似文献