'Gender as a multi-layered issue in journalism: ' A multi-method approach to studying barriers for women in Belgian newsrooms

In recent years, in feminist media studies there has been a growing interest in in media production processes, the structures of media organizations and the people working ‘behind the scenes’ of these companies. This research has documented that despite the increase of female journalists in the last decades, journalism remains vertically and horizontally divided along gender lines. Female journalists are strongly under-represented in older age groups, in decision-making positions and in prestigious news areas and media sectors. Although the blending of qualitative and quantitative methods can offer a fuller understanding of the mechanisms sustaining gender inequality in journalism, most studies either quantify the representation of women in journalism or use qualitative methods to explore how female journalists experience these barriers. The purpose of this paper is to fill the lack of multi-method research on gender inequality in journalism. In order to gain insight into the structural position of women in the journalistic workforce, we conducted a large-scale survey in Belgium. All active professional journalists were invited to participate. The response rate was 33.4% (1640 of 4913 journalists). These results are explored more in depth by means of qualitative interviews with 21 female journalists. The analysis confirms the existence of all ‘traditional’ barriers that women experience in the journalistic profession (e.g. the incompatibility of journalism and motherhood, the glass ceiling, sexism, …). The added value of this study is that we registered several additional difficulties for women in journalism, and most importantly that we gained insight in the strategies that our respondents use to deal with these gender-related barriers. These strategies were related to the support of a partner, the flexibility in the newsroom towards journalists with children, the choice to work part-time or freelance and the use of new communication technologies

A 5-MHz 11-bit delay-based self-oscillating ΣΔ modulator in 0.025 mm2

In this paper a self-oscillating Sigma Delta modulator is presented. By introducing this self-oscillation in the system, the loop filter operates at a speed significantly lower than dictated by the clock frequency. This allows for a simple and power efficient design of the opamps used in the loop filter. The self-oscillation is induced here by introducing a controlled delay in the feedback loop of the modulator. A second order CMOS prototype was constructed in a 0.18 um technology. A clock frequency of 850MHz generates a self-oscillation mode at 106.25 MHz. The modulator achieves a dynamic range (DR) of 66 dB for a signal bandwidth of 5 MHz. The power consumption is only 6mW and the chip area of the modulator core is 0.025mm^2

A rigorous approach to the robust design of continuous-time ΣΔ modulators

In this paper we present a framework for robust design of continuous-time Sigma Delta modulators. The approach allows to find a modulator which maintains its performance ( stability, guaranteed peak SNR, ...) over all the foreseen parasitic effects, provided it exists. For this purpose, we have introduced the S-figure as a criterion for the robustness of a continuous-time Sigma Delta modulator. This figure, inspired by the worst-case-distance methodology, indicates how close a design is to violating one of its performance requirements. Optimal robustness is obtained by optimizing this S-figure. The approach is illustrated through various design examples and is able to find modulators that are robust to excess loop delay, clock jitter and coefficient variations. As an application of the approach, we have quantified the effect of coefficient trimming. Even with poor trim resolution, good performance can be achieved provided beneficial initial system parameters are chosen. Another example illustrates the fact that also the out-of-band peaking behavior of the signal transfer function can be controlled with our design framework

Packet loss characteristics for M/G/1/N queueing systems

In this contribution we investigate higher-order loss characteristics for M/G/1/N queueing systems. We focus on the lengths of the loss and non-loss periods as well as on the number of arrivals during these periods. For the analysis, we extend the Markovian state of the queueing system with the time and number of admitted arrivals since the instant where the last loss occurred. By combining transform and matrix techniques, expressions for the various moments of these loss characteristics are found. The approach also yields expressions for the loss probability and the conditional loss probability. Some numerical examples then illustrate our results

The Nyquist criterion: a useful tool for the robust design of continuous-time ΣΔ modulators

This paper introduces a figure of merit for the robustness of continuous-time sigma-delta modulators. It is based on the Nyquist criterion for the equivalent discrete-time (DT) loop filter. It is shown how continuous-time modulators can be designed by optimizing this figure of merit. This way modulators with increased robustness against variations in the noise-transfer function (NTF) parameters are obtained. This is particularly useful for constrained systems, where the system order exceeds the number of design parameters. This situation occurs for example due to the effect of excess loop delay (ELD) or finite gain bandwidth (GBW) of the opamps. Additionally, it is shown that the optimization is equivalent to the minimization of H_infinity, the maximum out-of-band gain of the NTF. This explains why conventional design strategies that are based on H_infinity, such as Schreier’s approach, provide quite robust modulator designs in the case of unconstrained architectures