# Rubinstein Scharf Abraham

### Maître d'enseignement

#### Compétences principales

### Maître d'enseignement

Téléphone: +41 24 557 73 68

Bureau: B35

Route de Cheseaux 1, 1400 Yverdon-les-Bains, CH

- Sécurité informatique
- Sécurité des réseaux
- Architecture des réseaux et leur sécurisation
- Sécurité des Technologies Internet (et sécurité Web)
- Mobile and wireless communications

2013

*IEEE Transactions on Electromagnetic Compatibility*,
2013, vol. 55, no 4, pp. 648 - 656

**Résumé:**

The cascaded transmission line theory of Paul and McKnight is used in this paper to predict near-end crosstalk (NEXT) and far-end crosstalk (FEXT) in a bundle of twisted wire pairs. The approach is validated using the CST Cable Studio commercial software and experimental data. NEXT and FEXT along twisted pair bundles are then evaluated using a pure deterministic approach for the electromagnetic coupling while taking into account the random distribution of victim and aggressor pairs in the bundle. The results obtained using the presented approach are compared with available simplified empirical expressions (ANSI/FSAN). It is shown that the simplified expressions are able to predict the overall trend of the power sum loss. However, they do not always provide the worst case values. The presented theory can find important applications in the design of data transmission systems for which accurate crosstalk modeling is a vital task. It can be used for example as a replacement for the experiments in obtaining the parameters of simplified models for NEXT and FEXT.

2012

**Résumé:**

The paper presents the characteristics of a system suitably developed to measure lightning current waveforms on the Säntis Tower in Switzerland. The paper first describes the configuration of the system then presents the characteristics of the measurement equipment, in terms of bandwidth and accuracy, inferred by means of experimental tests. Finally, we present and discuss examples of waveforms measured using the system.

2006

*IEEE Transactions on electromagnetic compatibility*,
2006, vol. 48, no. 2, pp. 258 - 263

**Résumé:**

This paper presents a derivation and a physical interpretation of the equal area rule (EAR) for wire-grid simulation of surfaces. We propose a new procedure that leads to a formulation for obtaining the radii for an arbitrarily meshed surface. A simple comparison of the classical EAR and the new equal area rule (NEAR) is presented in which the electric field inside a closed metallic surface, which is known to be identical to zero, is calculated using the radii predicted by the two methods. The results show that the proposed new equal area rule predicts a smaller field for the frequency range considered, suggesting an improvement over the classical EAR.

2005

*IEEE Transactions on electromagnetic compatibility*,
2005, vol. 47, no. 1, pp. 192 - 195

**Résumé:**

This work deals with the wire-grid representation of metallic surfaces in numerical electromagnetic modeling. We discuss in particular the adequacy of the well known and widely used equal area rule (EAR) to calculate the radii of wire-grid models. We show that the EAR is accurate as long as the wire grid consists of a simple rectangular mesh. For more complex body-fitted meshes, using other polygons such as triangles, the EAR appears to be less accurate in reproducing the electromagnetic field scattered by metallic bodies. The conclusions of the paper are supported by numerical simulations performed using a parallel version of the numerical electromagnetics code and experimental data obtained on a vehicle illuminated by an electromagnetic pulse simulator.

2003

*IEEE Transactions on electromagnetic compatibility*,
2003, vol. 45, no. 2, pp. 177 - 188

**Résumé:**

We present a new, parallel version of the numerical electromagnetics code (NEC). The parallelization is based on a bidimensional block-cyclic distribution of matrices on a rectangular processor grid, assuring a theoretically optimal load balance among the processors. The code is portable to any platform supporting message passing parallel environments such as message passing interface and parallel virtual machine, where it could even be executed on heterogeneous clusters of computers running on different operating systems. The developed parallel NEC was successfully implemented on two parallel supercomputers featuring different architectures to test portability. Large structures containing up to 24000 segments, which exceeds currently available computer resources were successfully executed and timing and memory results are presented. The code is applied to analyze the penetration of electromagnetic fields inside a vehicle. The computed results are validated using other numerical methods and experimental data obtained using a simplified model of a vehicle (consisting essentially of the body shell) illuminated by an electromagnetic pulse (EMP) simulator.

2021

*Proceedings of the 35th International Conference on Lightning Protection (ICLP), XVI International Symposium on Lightning Protection (SIPDA)*

**Résumé:**

The Säntis Tower was instrumented in May 2010 to measure currents of lightning discharges striking the tower. Since then the system has been recurrently updated and expanded. Currently, data associated with lightning strikes to the tower are collected at five different sites. The facility is equipped with a current measurement system, three electric field antennas, an electrostatic field mill, two x-rays sensors, a high-speed camera and four full HD cameras. This paper presents the latest measurement configuration at the facility.

2011

*Proceedings of 2011 International Symposium on Lightning Protection, 3-7 October 2011, Fortaleza, Brazil*

**Résumé:**

In this paper, direct lightning current measurements obtained on the Säntis Tower from June 1st, 2010 to May 31st, 2011 are used to evaluate the ability of the EUCLID lightning detection network to detect this type of lightning triggered by a tall tower in terms of detection efficiency, location accuracy and peak current estimates. The Säntis Tower is a 124-meter tall tower sitting on the top of the Säntis Mountain (2500 m) in Switzerland. The tower has been instrumented to measure waveforms of the lightning current and of its time derivative. In the considered period, 57 flashes were recorded at the Säntis Tower out of which 15 were of positive polarity. The data have been correlated to EUCLID data by comparing the time-stamps provided by the GPS time references. The flash detection efficiency for negative flashes is estimated to be 93%. The median value of the location error is 126 m. The EUCLID peak current estimates were on average significantly larger than the measured current. The measurements include four typical positive flashes, which were successfully detected by EUCLID. The location errors for the positive events ranged from 1 to 3 km, with a median of 959 m.

*Proceedings of 10th International Symposium on Electromagnetic Compatibility (EMC Europe 2011), 26-30 September 2011, York, UK*

**Résumé:**

Abstract:The cascaded transmission line theory is used in this paper to predict near end crosstalk (NEXT) and far end crosstalk (FEXT) in a bundle of twisted wire pairs (TWP). The approach is validated using both, the available data in the literature and also using the CST Cable Studio ® commercial software. NEXT and FEXT along twisted pair bundles are then evaluated using a pure deterministic approach for the electromagnetic coupling while taking into account the random distribution of disturbed and disturbing pairs in the bundle. The results obtained using the presented approach are compared with available simplified empirical expressions (ANSI/FSAN). It is shown that the simplified expressions are able to predict the overall trend of the power sum loss. However, they do not always provide the worst-case values. The presented theory can find important applications in the design of next generation data transmission systems for which accurate crosstalk modeling is a vital task. It can be used for example as a replacement of the experiments in obtaining the parameters of simplified models for NEXT and FEXT.

2010

*Proceedings of the 4th International Workshop on Electromagnetic Radiation from Lightning to Tall Structures*

**Résumé:**

This paper reports on the progress in a new project to instrument the Säntis telecommunications tower in the Saint Gallen region of Switzerland. The paper includes information on the Rogowski coils and magnetic loop sensors that will be used to measure the lightning current. In addition, information is given on the design of the control and monitoring system in the context of the particularly rough weather conditions of the site.

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