1,721,050 research outputs found
'Situated knowledge' - exploring civil society views on the Rohingya crisis in United Nations universal periodic review data
No full textPerformance investigation of H control and port controlled Hamilton with dissipation based nonlinear control for IPMSM drives
Full text linkWithin the field of electrical drive systems, there has been increasing popularity
in the use of permanent magnetic synchronous machines as an execution unit, and the cooperation
with high performance control strategy. Industrial engineers and researchers have developed
countless applications with PM motors such as wind energy, hybrid vehicle and even in the elevator
field. PMSM is a multivariate, nonlinear, time-varying system. Its entire operation is influenced
by parameter variation, external load disturbance and unmodelled uncertainty. To eliminate such
negative impacts and develop better performing PMSM control system, advanced control algorithms are
critical.
Therefore, this thesis forces on developing two different control techniques such as
mixed-sensitivity based H∞ controller and port controlled Hamilton with dissipation (PCHD)
controller to handle the uncertainties of the drives. Former one establishes the controller in
terms of frequency domain, successfully converted IPMSM control problem to a standard H∞ based
mixed-sensitivity problem by selecting proper weight functions and solving its correspond Ricatti
equations. While the latter one realizes the control objective in energy aspects by assigning
interconnection and damping matrix for IPMSM system to prove its passivity and ensure global
stability. The performances of both controllers for IPMSM drive have been investigated in both
simulations and experiments using MATLAB-Simulink and dSPACE DSP board DS1104 for a 5 hp prototype
motor. A direct current (DC) machine is coupled with IPMSM shaft to use as dynamic load. It is
found that the performances of both controllers are robust at different operating conditions
while PCHD exhibits better dynamic performance than that of H∞ control
Myanmar’s Muslim communities unbound:the Rohingya and beyond
No full textThe Rohingya are a community at a cusp. Deported and cleansed over several waves of violence they have mostly been removed from the territory they call home. Located at the political, legal, and cultural margins of both Myanmar and Bangladesh, this ethnic community of just over two million people2 belong to neither and are othered by both states, as they unsettle their nation-building projects. Over time, and particularly from 1962 onwards, the Myanmar3 authorities have disenfranchised and later persecuted this group, which has for very long been indigenous to Arakan/Rakhine. It has done so through a combined discourse of national unity centred around ‘Myanmafication’ (or Burmanization) and the Bengalization of the country’s Muslims. While immigration of both Muslims and Hindus has in fact increased from India, including Bengal, during British colonial rule, bundling all Muslims into one undistinguished, bounded, and – the argument goes – illegal immigrant group, the argument is used to justify the marginalisation, even expulsion of a large portion of Myanmar’s society. A ‘purified’, coherent and cohesive Myanmar society could then emerge, no longer under siege from an alien other, built around Burman ethnicity and the Buddhist faith.This chapter is concerned with interrogating and debunking the discourses of unity prevalent in certain periods of Burma/Myanmar’s political life. Privileging ‘Myanmafication’ and collapsing ethnicity, race and religion all in one, the Rohingya, and the country’s various – and varied - Muslim communities have been bundled into a single meta-group, in fact a ‘meta-other’. In Myanmar at least, the Rohingya’s ‘alterity is perceived as inassimilable and irrefragable’ (Frydelund 2020: 238). Increasingly, this has become the case for many other Muslim communities too. The chapter takes issue with such tendencies to essentialise and reify the Rohingya and more generally Myanmar’s Muslim experiences. To do so, it draws on the insights of constructivist (Brubaker, 2002 and 2009) and more critical, anti-essentialist literature on trans-border identities and diasporic conditions (Appadurai, 1996; Anthias, 1998; Clifford 1994) and, empirically, the more nuanced anthropological studies of the Rohingya (Uddin, 2019; Uddin and Chowdhory 2019) and Myanmar’s Kamans (Nyi Nyi Kyaw 2016). By so doing, this chapter aims to shed light on this diversity by offering a more nuanced view on Myanmar’s Muslims and contribute to a de-essentialisation and a more fluid understanding of Myanmar’s ‘Muslim mosaic’ (Crouch, 2016). The contribution embeds the case of the Rohingya in a comparative perspective on Myanmar’s Muslims, focusing especially on the Kaman, the Panthay (Chinese Muslims), Burmese Muslims, and the Malay (Pashu) Muslims4. The chapter details the heterogeneity of Myanmar’s Muslim communities by considering variation in size, region of settlement, historical patterns of settlement, and status in today’s Myanmar. The chapter’s main added value lies in its attempt to bring some nuance and problematisation to the study of the Rohingya which, after decades of neglect, has benefited from expanding interest, hitherto mostly confined to single case studies of the community. The chapter is structured as follows. First, I briefly review the key themes in the scholarship on the Rohingya. Next, I embed the case study in a broader critique of the study of ethnicity and nations in a substantialist and essentialist manner and advance the case for anti-essentialism and a greater appreciation of hybridity and change. I subsequently detail the similarities and differences between Myanmar’s various Muslim communities, before concluding
Entry, access, bans and returns:reflections on positionality in field research on Central Asia’s ethnic minorities
No full textDrawing on fieldwork conducted in post-Soviet Central Asia, the chapter explores questions of researcher positionality in relation to research on ethnic minorities. This allows me to reflect on my own positionality as an international researcher from an institution in the Global North conducting fieldwork in authoritarian, conflict/post-conflict and/or illiberal contexts. The chapter uses experiences and lessons learnt as regards entry and access to ‘the field’—as well as bans and subsequent returns—to reflect on issues of privilege and (self-)representation, and more generally situated knowledge, in order to shed light on how my identities impacted on the production of knowledge and the way in which my research was shaped by the structures in which it was embedded and being created. The chapter compares challenges and opportunities in entry and access to three field sites different in terms of time, place, and open-ness of the research environment: the case of the Tajik community in Uzbekistan; the position of ethnic Uzbeks in Kyrgyzstan and Tajikistan and their relationship with Uzbekistan; and the ethnic Koreans in Kyrgyzstan and Uzbekistan. The chapter draws on lessons learnt over multiple rounds of fieldwork from 2001 to 2021, in the midst of the Covid-19 pandemic. As it highlights the fluid and relational nature of positionality(-ies), the chapter calls for active reflexivity to more consciously reflect on researcher positionality
Nonlinear controller design for a buck converter
Full text linkThis thesis presents five different nonlinear control techniques for voltage regulation of a
DC-DC buck converter operating in continuous conduction mode. A state space
averaging model is derived from a non-ideal buck converter circuit with the consideration
of resistances of each component.
Based on this model, different nonlinear control techniques have been developed to
control the DC-DC buck converter. These include backstepping control, sliding mode
control, backstepping sliding mode control, adaptive backstepping control, and adaptive
backstepping sliding mode control. All these proposed controllers have been evaluated by
computer simulation and implemented on the DC-DC buck converter which is built for
this thesis.
Simulation and experimental results show that all the proposed controllers are able to
stabilize the closed loop system and to achieve satisfactory voltage regulation
performances under source voltage variations and load changes
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
sj-docx-1-ctj-10.1177_17407745231211272 – Supplemental material for Evaluating whether the proportional odds models to analyse ordinal outcomes in COVID-19 clinical trials is providing clinically interpretable treatment effects: A systematic review
No full textSupplemental material, sj-docx-1-ctj-10.1177_17407745231211272 for Evaluating whether the proportional odds models to analyse ordinal outcomes in COVID-19 clinical trials is providing clinically interpretable treatment effects: A systematic review by Masuma Uddin, Nasir Z Bashir and Brennan C Kahan in Clinical Trials</p
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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