Large-signal impedance of grid-connected converters can be used to predict resonance-generated distortions in converter-grid systems. Note that the large-signal impedance of a network represents its impedance response for different magnitudes of perturbation injected at its terminals. This paper presents large-signal impedance-based modeling and mitigation of resonance of grid-connected voltage source converters. Challenges of large-signal modeling because of the inapplicability of the small-signal approximation are addressed by leveraging the dominating influence of hard nonlinearities (such as pulsewidth modulation saturation and limiters) over soft nonlinearities (such as Park's transformations and phase-locked loop (PLL)) in shaping the large-signal behavior of the converter. The paper develops large-signal gains of hard nonlinearities using different types of describing functions. The paper shows that the large-signal impedance of a voltage source converter (VSC) can be shaped to reduce resonance-generated distortions by inserting limiters in the control system of the VSC. Developed large-signal impedance models are validated using numerical simulations of a VSC with dq current control and PLL. Large-signal impedance measurements of a commercial 1 MW VSC-based inverter and a medium-voltage doubly-fed induction generator with approximate 4 MW rating are presented to experimentally demonstrate the influence of the injected perturbation magnitude on the impedance response.


Postcolonial trauma studies have from the start enabled the inclusion of interdisciplinary research, but postcolonial literary critics have long hesitated to develop innovative approaches to trauma theory. Now, however, interdisciplinary, comparative, and relational approaches to trauma are explored to accommodate broader ethical and political registers of trauma research for postcolonial studies. This relational, non-oppositional approach is what this article explores and demonstrates in an analysis of Toni Morrison's novel Home (2012). It argues that Morrison addresses, absorbs and transforms pre-existing discourses on trauma and race, contributing to conceptualizations of modes of healing and redress not currently privileged in cultural trauma theory.


Those who design gesture recognizers and user interfaces often use data collection applications that enable users to comfortably produce gesture training samples. In contrast, games present unique contexts that impact cognitive load and have the potential to elicit rapid gesticulations as players react to dynamic conditions, which can result in high gesture form variability. However, the extent to which these gestures differ is presently unknown. To this end, we developed two games with unique mechanics, Follow the Leader (FTL) and Sleepy Town, as well as a standard data collection application. We collected gesture samples from 18 participants across all conditions for gestures of varying complexity, and through an analysis using relative, global, and distribution coverage measures, we confirm significant differences between conditions. We discuss the implications of our findings, and show that our FTL design is closer to being an ecologically valid data collection protocol with low implementation complexity.


On the occasion of the 125th anniversary of the American Psychological Association, the legacies and progenies of the discipline of educational psychology are explored. To capture those legacies, transformational and influential contributions by educational psychologists to schools and society are described as key themes. Those themes entail: the "psychologizing" of education, engagement in interdisciplinary and cross-disciplinary inquiry, a focus on learning as a core construct, an investment in measurement and an appreciation of human variability, and a search for evidence-based approaches and practices that work. To project forward, those same thematic areas are revisited 25 years from now as the means of speculating on educational psychology's future contributions to schools and society. In both the case of the legacies and progenies, potential difficulties or particular challenges are also considered. (PsycINFO Database Record (c) 2018 APA, all rights reserved)


Social media influencer named Fadil Jaidi is the CEO (Chief Executive Officer) of the food culinary business @Trafficbun.id. Fadil Jaidi not only does product branding, He also carries out a personal branding process through social media (Instagram). The purpose of the study is to determine personal branding and the steps to form Fadil Jaidi based on Instagram social media (ini kalimat indo nya gajelas jadi translate nya seadanya aja, ga ngerti maksud nya). The result of this study is that Fadil Jaidi formed a personal branding using the features on Instagram. Fadil Jaidi's personal branding process goes through 7 aspects. Specialization : Fadil Jaidi likes culinary. Leadership: he has a friendly nature (tidak melihat latar belakang kyknya masih kurang jelas deh, latar belakang apa? Tapi kalo translate nya : and does not see any kind of background). Personality: he has a humorous and humble personality. The difference/uniqueness : the clothes he used are always full color. Unity: cheerful, friendly, and humorous. Persistence: Fadil Jaidi is up to date on social media Instagram. Good intentions: never respond to haters on Instagram social media and keep uploading promos and innovations for Trafficbun.id.


This article aims to develop model for the right policy Tools available from the cause analysis regarding the regional differences of subway modal split in Seoul metropolitan area. This allows two major factors of the most influential subway modal split to be proved and Portfolio Analysis is conducted. The results are as follows. Firstly, the two primary factors affecting subway modal split were shown as subway adjacent area and local line bus. It signifies that expansion of subway adjacent area, establishing the number of the subway stations and increase of local line bus are required in order to improve a diminishing subway modal split. Following that, pattern of the improvement to strengthen better subway connections are classified according to the two areas which are Concentration Area of Improvement in Subway Station Area (CAISSA) and Concentration Area of Improvement in Local Bus (CAILB). Our study revealed that Ganbukgu, Seodaemungu, Geumcheongu, and Gwanakgu were selected as the area of CAILB and Songpagu, and Junggu were selected as the area of CAISSA. As all things are considered, transportation policy makers should be taken into account in the two main factors driven by our study according to types in order to enhance the future subway share proportion.


A multilevel algorithm for the computation of the transient radiation patterns of true time delay (TTD) conformal arrays over a range of observation and beam steering directions is presented. The multilevel algorithm is based on hierarchical decomposition of the array into smaller sub-arrays of elements. At the finest level of decomposition, the angular-temporal radiation patterns of single-element sub-arrays are obtained over a sparse angular grid of directions and short temporal duration, by either measurement or calculation. Subsequent steps of the algorithm comprise multilevel aggregation of delayed sub-array contributions. This process continues until the transient radiation pattern of the whole array is obtained. At each level, the radiation pattern is interpolated to a finer angular grid of observations and steering directions followed by temporal delay compensation. The multilevel array decomposition algorithm attains a computational complexity substantially lower than that of the direct evaluation. Furthermore, the algorithm is particularly efficient for large arrays with large numbers of elements.


This article explores the changing attitudes towards student accommodation in higher education in the United Kingdom since the end of the Second World War. In the first part of this period there was a firm assumption, in universities and teacher training colleges, that the accommodation of students in or close to their university or college, preferably in association with at least some academics, was the preferred strategy. Latterly, however, with the lowering of the age of majority and the massification of higher education provision, practice has shifted towards both a greater reliance on the private sector in providing student accommodation, and a more entrepreneurial approach on the part of universities and colleges in managing their own student accommodation.


We have observed a temperature-dependent impedance anomaly in Ni-Cu multilayer (ML) ultra-thin films grown epitaxially on Si(111) substrate. Here we report temperature (T ) dependent surface resistance (Zreal ) anomaly as a function of dc magnetic field (H ); around T = T * (where T * is a characteristic temperature, H ~1.35 kOe for sample S1) Zreal saturates at a constant value, for T > T * it exhibits a negative slope, but for T < T * this slope is positive. We report the first measurements of microwave giant magneto resistance (µW-GMR) and exchange coupling (J ) on these MLs from surface impedance data of swept-frequency ferromagnetic resonance (FMR) experiments. The interlayer diffusion length was observed to increase with the annealing temperature of the sample, which suggests a spin-glass-like behaviour in Ni/Cu ML films.