Optimization of Lumped Parameter Models to Mitigate Numerical Oscillations in the Transient Responses of Short Transmission Lines

The Lumped Parameter Model (LPM) is a known approach to represent overhead transmission lines (TLs), especially when these elements comprehend a few tens of kilometers. LPMs employ a large number of cascaded π-circuits to compute accurately the transient responses. These responses contain numerical spurious oscillations (NSO) characterized by erroneous peaks which distort the transient responses, mainly their peak values. Two modified LPM topologies composed of damping resistances inserted along the longitudinal or transversal branches of the cascaded π-circuits offer significant mitigations in the NSO. In this paper, in an effort to have the maximum mitigation of the NSO and low distortion in the transient responses, two modified topologies with optimized damping resistances are proposed to represent short TLs. Results demonstrate expressive attenuation in the peaks of NSO which reflect good agreement in comparison with the responses computed by the Bergeron’s line model. The mitigation of the NSO is carried out directly in the time domain and it does not require either analog or digital filters.Furthermore, no frequency-to-time transformations are necessary in this procedure. These alternative topologies can be incorporated into any electromagnetic transient program to study switching operations in power systems.

A note on cash-in-advance constraints in continuous time

This paper demonstrates a robust proof of the continuous-time transformations of Stockman's cash-in-advance constraints. When the constraint applies to consumption and capital purchases, monetary growth lowers steady state consumption and capital. When the constraint applies only to consumption purchases, monetary growth is superneutral.

A note on cash-in-advance constraints in continuous time

This paper demonstrates a robust proof of the continuous-time transformations of Stockman's cash-in-advance constraints. When the constraint applies to consumption and capital purchases, monetary growth lowers steady state consumption and capital. When the constraint applies only to consumption purchases, monetary growth is superneutral.

Trauma societies and their characteristics: Between evolution and revolution

The development of civilization at the present stage is faced with a phenomenon that is still poorly studied and lítde known, which we call the trauma of’ society. The fact is that significant, special and specific events are taking place in the world that caunot be defined and qualified in the old terms of evolution and revolution, which describe and reflect the changes that are taking place. Currently, there are 53 states that, according to the World Bank, that have been or are ina state of chaotic, unbalanced and turbulent development for a long period. This state allows us to state that along with the main recognized development paths -revolution and evolution - ia the modern worldthere ls such a specific phenomenonas trauma society. Ítis showa how the concept oftrauma acquired a social sound, and how itwas interpreted in the scientific literature, 20d to what extent was reflected ia political vocabulary. The author refers as trauma societies to countries tbat have stagnated for along time io their development orare ioa state of recession andlose their previously achieved milestones. The article reveals the essential characteristics of a trauma society, the reasons for its occurrence, and the consequences of its functioning. Particular attention is paid to Russia, which, according to the author, can be described as trauma aud injured society, since in its development, having rejected the socialist past, it did not reach the Achievements from which it began its way in 1991. At the same time, transformations carried out for more than a quarter of a century forra a raosaic in which it is difficult/impossible to distinguish between evolutionary and revolutionarv treads. In this regard, an analysis of the obstacies that are not overcome for the iniplementationofa truly democratic, eficiently functioning society is given.

Properties of Switch-List Representations of Boolean Functions

In this paper, we focus on a less usual way to represent Boolean functions, namely on representations by switch-lists, which are closely related to interval representations. Given a truth table representation of a Boolean function f the switch-list representation of f is a list of Boolean vectors from the truth table which have a different function value than the preceding Boolean vector in the truth table. The main aim of this paper is to include this type of representation in the Knowledge Compilation Map by Darwiche and Marquis and to argue that switch-lists may in certain situations constitute a reasonable choice for a target language in knowledge compilation. First, we compare switch-list representations with a number of standard representations (such as CNF, DNF, and OBDD) with respect to their relative succinctness. As a by-product of this analysis, we also give a short proof of a longstanding open question proposed by Darwiche and Marquis, namely the incomparability of MODS (models) and PI (prime implicates) representations. Next, using the succinctness result between switch-lists and OBDDs, we develop a polynomial time compilation algorithm from switch-lists to OBDDs. Finally, we analyze which standard transformations and queries (those considered by Darwiche and Marquis) can be performed in polynomial time with respect to the size of the input if the input knowledge is represented by a switch-list. We show that this collection is very broad and the combination of polynomial time transformations and queries is quite unique. Some of the queries can be answered directly using the switch-list input, others require a compilation of the input to OBDD representations which are then used to answer the queries.

Studying Platforms and Cultural Production: Methods, Institutions, and Practices

This introduction to the second special collection of articles on the platformization of the cultural industries foregrounds research methods and practices. Drawing from the 12 articles included in this collection, as well as the 14 articles published in the first collection, we identify commonalities in approaches, consistencies in traditions, and uniform modes of analysis. We argue that approaches that have been deployed in media industry studies for decades—semi-structured interviews, discourse analysis, content analysis, and participant observation—remain productive. At the same time, transformations in the temporalities and curation of cultural production require updated modes of investigation and analysis. As such, we spotlight contributors’ novel methods and innovative theoretical approaches, such as the walkthrough method and multi-sided market theory.

Switch-List Representations in a Knowledge Compilation Map

In this paper we focus on a less usual way to represent Boolean functions, namely on representations by switch-lists. Given a truth table representation of a Boolean function f the switch-list representation (SLR) of f is a list of Boolean vectors from the truth table which have a different function value than the preceding Boolean vector in the truth table. The main aim of this paper is to include the language SL of all SLR in the Knowledge Compilation Map [Darwiche and Marquis, 2002] and to argue, that SL may in certain situations constitute a reasonable choice for a target language in knowledge compilation. First we compare SL with a number of standard representation languages (such as CNF, DNF, and OBDD) with respect to their relative succinctness. As a by-product of this analysis we also give a short proof of a long standing open question from [Darwiche and Marquis, 2002], namely the incomparability of MODS (models) and PI (prime implicates) languages. Next we analyze which standard transformations and queries (those considered in [Darwiche and Marquis, 2002] can be performed in poly-time with respect to the size of the input SLR. We show that this collection is quite broad and the combination of poly-time transformations and queries is quite unique.

Are Reaction Time Transformations Really Beneficial?

We investigate whether or not the common practice of transforming response times prior to conventional analyses of central tendency yields any notable benefits. We generate data from a realistic single-bound drift diffusion model with parameters informed by several different typical experiments in cognition. We then examine the effects of log and reciprocal transformation on expected effect size, statistical power, and Type I error rates for conventional two-sample t-tests. One of the key elements of our setup is that RTs have a lower bound, called the shift, which is well above 0. We closely examine the effect that different shifts have for the analyses. We conclude that logarithm and reciprocal transformation offer no gain in power or Type I error control. In some typical cases, reciprocal transformations are detrimental as they lead to a lowering of power.