Computation of 10 Knife Edge Diffraction Loss Using Epstein-Peterson Method
Wali Samuel,
Trust Christopher Oguichen,
Steve Worgu
Issue:
Volume 6, Issue 1, February 2017
Pages:
1-4
Received:
3 January 2017
Accepted:
10 January 2017
Published:
3 February 2017
Abstract: In this paper, application of Epstein-Peterson method in the computation of a ten (10) multiple knife edge diffraction loss is presented for a 1 GHz microwave link. In the computation, each of the ten obstructions gave rise to a virtual hop which resulted in a knife edge diffraction loss. What is peculiar to the Epstein-Peterson method is how the virtual hops are identified or defined. The overall diffraction loss, according to the Epstein-Peterson method is the sum of the diffraction loss computed for each of the ten virtual hops. In the results, the highest LOS clearance height of 5.727273 m occurred in virtual hop 5 whereas the highest diffraction parameter of 0.333333 and the highest virtual hop diffraction loss of 8.908754dB occurred in virtual hop1. The lowest LOS clearance height of 0.4 m, the lowest diffraction parameter 0.029814 and the lowest virtual hop diffraction loss, 6.290874 dB occurred in virtual hop 9. In all, the overall effective diffraction loss for the 10 knife edge obstructions as computed by the Epstein-Peterson is 69.93384 dB.
Abstract: In this paper, application of Epstein-Peterson method in the computation of a ten (10) multiple knife edge diffraction loss is presented for a 1 GHz microwave link. In the computation, each of the ten obstructions gave rise to a virtual hop which resulted in a knife edge diffraction loss. What is peculiar to the Epstein-Peterson method is how the v...
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Towards a Platform Independent Graphical User Interface
Abdessamad Belangour,
Said Sadik,
Amina Abbar
Issue:
Volume 6, Issue 1, February 2017
Pages:
5-12
Received:
29 October 2016
Accepted:
25 November 2016
Published:
24 February 2017
Abstract: In classical software development processes, graphical user interfaces cannot be reused across development platforms. In addition, in MDA-based processes, they are integrated only after making the transformation of the PIM to the PSM since they belong to the target platform and hence have the same problem. They are considered part of the PSM, which deprives us from reusing them as we do for the business logic. In this paper, we aim at proposing a common platform independent graphical user interface library that represents the presentation logic in terms of inputs and outputs. This is achievable through proposing a generic metamodel for basic GUI controls that focus on getting and presenting data rather than those of ergonomic purposes. This metamodel will enable us to build generic graphical interfaces that can be transformed to any of the market libraries such as AWT, SWING, WinForms, Tkinter. That is why we built metamodels for those libraries and defined mappings between the generic metamodel and those libraries metamodels. Finally, the generic GUI library is used to make PIM-GUIs that are kept with business-PIMs and that can together be reused in a way that is independent from any development platform. Final mappings transforms these PIM-GUIs into platform bound GUIs or PSM-GUIs such those we mentioned earlier or any future graphical library.
Abstract: In classical software development processes, graphical user interfaces cannot be reused across development platforms. In addition, in MDA-based processes, they are integrated only after making the transformation of the PIM to the PSM since they belong to the target platform and hence have the same problem. They are considered part of the PSM, which...
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