The agent-structure issue in foreign policy analysis (FPA) – the “Macedonian” issue

It was a pleasure and an honour to spend a semester (January 2014 – July 2014) as a post-doctoral research fellow at the LSE Hellenic Observatory, during which I was preoccupied with the topic of agent-structure in International Relations Theory and Foreign Policy Analysis, attempting to apply the conclusions reached in that field to the analysis of Greek Foreign Policy towards FYROM

Scientific realism in the philosophy of science and international relations

This thesis sets out to challenge the assumption widely held among IR scholars that Scientific Realism (SR) is the definite and final interpretation of realism. The introduction of SR into IR as the latter’s proper meta-theory has been the incentive for very intense debates about both meta-theoretical and theoretical IR issues. I argue that IR has uncritically adopted the strongest version of SR. This can be seen by comparing the different versions of SR and their anti-realist alternatives - as these have developed in the Philosophy of Science literature - to the version of SR which was introduced into IR. It is Critical Realism (CR), however, a version of SR that originated with Roy Bhaskar, which has dominated the SR debate in IR. This development has had negative consequences with respect to the quality of the argumentation about realism in IR. This notwithstanding, a positive implication of this situation is that IR scholars who belong in various traditions of thought have criticized SR from different theoretical angles and thus shed light on many of its shortcomings. I elaborate on the comments that have been made on meta-theoretical as well as theoretical issues and come up with my own conclusions about SR and CR. In this framework, I also deal with two special issues which have arisen from this debate’s problematique: the question about whether reasons can be causes, which lies in the foundations of Wendt’s ‘constitutive explanation’, and the challenge of ‘meta-theoretical hypochondria’, according to which the extensive concern with meta-theory takes place at the expense of theorizing real-world political problems. Last, I show, by a way of a novel contribution, that Wendt’s latest undertaking, of a ‘quantum social science’, although compatible with SR, suffers inconsistencies and misunderstandings in terms of its methodology, metaphysics, use of quantum mechanics, and application to IR. This thesis is an interdisciplinary study, which draws upon the Philosophy of Science, IR and Physics (namely Quantum Mechanics), in order to scrutinize the use of SR and CR into IR along with its implications for both IR metatheory and IR theory

A Deep Representation for Invariance And Music Classification

Representations in the auditory cortex might be based on mechanisms similar to the visual ventral stream; modules for building invariance to transformations and multiple layers for compositionality and selectivity. In this paper we propose the use of such computational modules for extracting invariant and discriminative audio representations. Building on a theory of invariance in hierarchical architectures, we propose a novel, mid-level representation for acoustical signals, using the empirical distributions of projections on a set of templates and their transformations. Under the assumption that, by construction, this dictionary of templates is composed from similar classes, and samples the orbit of variance-inducing signal transformations (such as shift and scale), the resulting signature is theoretically guaranteed to be unique, invariant to transformations and stable to deformations. Modules of projection and pooling can then constitute layers of deep networks, for learning composite representations. We present the main theoretical and computational aspects of a framework for unsupervised learning of invariant audio representations, empirically evaluated on music genre classification.Comment: 5 pages, CBMM Memo No. 002, (to appear) IEEE 2014 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2014

NEIGHBORHOODS, PROXIMITY TO DAILY NEEDS, & WALKABILITY IN FORM-BASED CODES

Form-based codes are evaluated with criteria often requiring additional clarification. To better identify form-based code evaluation criteria, this thesis identifies the major intentions of form-based codes from the literature and focuses on the first intention, quality of life. The form-based code literature relates quality of life to three principles with underlying parameters: neighborhood with a center and edge, proximity to daily needs, and walkability. Neighborhood refers to the identification of walkable districts of about .25 mile radius with a clear center and edge. Proximity to daily needs requires diversity of uses in proximity to residential uses so that residents travel short distances to address daily needs. Walkability is a more complex principle with numerous impacting parameters effective only when working in tandem with each other. A selection of six case studies from award-wining form-based codes test the presence of the three quality of life principles in form-based code practice and the findings are discussed. All six case studies incorporated the three quality of life principles with some differences in all form-based planning process phases. Neighborhood is used as equivalent to a .25 mile pedestrian shed. The value of the concept of neighborhood edge in from-based codes remains unclear, however, since few case studies included it and needs to be explored further. Neighborhood with a center and edge therefore can be rephrased to a .25 mile pedestrian shed with a center. The .25 mile pedestrian shed alone is a fundamental parameter in all 3 quality of life principles and all case studies incorporated this parameter. Proximity to daily needs parameters as identified are also incorporated in all case studies. Walkability parameters that require building adaptations to walkable environments were present in all case studies. Walkability parameters, however, addressing standards for sidewalks and streets, were uncommon in some studies and, as a result, application of walkability parameters varied across case studies. Therefore, satisfying the quality of life form-based code intention, the 3 principles of pedestrian shed with a center, proximity to daily needs, and walkability can be used as part of the set of criteria to assess form-based codes. All 3 principles point to the direction of sustainability in an effort to create cities that are efficient to manage and highly appropriate for daily human function

Learning An Invariant Speech Representation

Recognition of speech, and in particular the ability to generalize and learn from small sets of labelled examples like humans do, depends on an appropriate representation of the acoustic input. We formulate the problem of finding robust speech features for supervised learning with small sample complexity as a problem of learning representations of the signal that are maximally invariant to intraclass transformations and deformations. We propose an extension of a theory for unsupervised learning of invariant visual representations to the auditory domain and empirically evaluate its validity for voiced speech sound classification. Our version of the theory requires the memory-based, unsupervised storage of acoustic templates -- such as specific phones or words -- together with all the transformations of each that normally occur. A quasi-invariant representation for a speech segment can be obtained by projecting it to each template orbit, i.e., the set of transformed signals, and computing the associated one-dimensional empirical probability distributions. The computations can be performed by modules of filtering and pooling, and extended to hierarchical architectures. In this paper, we apply a single-layer, multicomponent representation for phonemes and demonstrate improved accuracy and decreased sample complexity for vowel classification compared to standard spectral, cepstral and perceptual features.Comment: CBMM Memo No. 022, 5 pages, 2 figure

Form-based codes: An overview of the literature

Urban form, sustainability, community vision, place specificity, code document clarity, and efficiency of the development process are identified as the essential themes behind form-based codes by Evan Evangelopoulos and Cornelius Nurworsoo. The authors note the need to develop measurable parameters to better study these themes and understand the impact of form-based codes in their effort to reform US cities and move them away from Euclidian zoning

Agenda setting and active audiences in online coverage of human trafficking

Online news platforms and social media increasingly influence the public agenda on social issues such as human trafficking. Yet despite the popularity of online news and the availability of sophisticated tools for analyzing digital texts, little is known about the relations between news coverage of human trafficking and audiences’ reactions to and interpretations of such coverage. In this paper, we examine journalists’ and commenters’ topic choices in coverage and discussion of human trafficking in the British newspaper The Guardian from 2009 to 2014. We use latent semantic analysis to identify 11 topics discussed by both journalists and readers, and analyze each topic in terms of the degree to which journalists and readers agree or disagree in their topic preferences. We find that four topics were preferred equally by journalists and commenters, four were preferred by journalists, and three were preferred by commenters. Our findings suggest that theories of ‘agenda setting’ and of the ‘active audience’ are not mutually exclusive, and the scope of explanation of each depends partly on the specific topic or subtopic that is analyzed

Magnetic susceptibility, nanorheology, and magnetoviscosity of magnetic nanoparticles in viscoelastic environments

While magnetic nanoparticles suspended in Newtonian solvents (ferrofluids) have been intensively studied in recent years, the effects of viscoelasticity of the surrounding medium on the nanoparticle dynamics are much less understood. Here we investigate a mesoscopic model for the orientational dynamics of isolated magnetic nanoparticles subject to external fields, viscous and viscoelastic friction as well as the corresponding random torques. We solve the model analytically in the overdamped limit for weak viscoelasticity. By comparison to Brownian Dynamics simulations we establish the limits of validity of the analytical solution. We find that viscoelasticity does not only slow down the magnetization relaxation, shift the peak of the imaginary magnetic susceptibility $\chi''$ to lower frequencies and increase the magnetoviscosity, it also leads to non-exponential relaxation and a broadening of $\chi''$. The model we study also allows to test a recent proposal for using magnetic susceptibility measurements as a nanorheological tool using a variant of the Germant-DiMarzio-Bishop relation. We find for the present model and certain parameter ranges that the relation of the magnetic susceptibility to the shear modulus is satisfied to a good approximation

Simulation applied to Evaluate and Improve the Operation of a Soccer Ticket Club Call Centre

Today, call centres are complex systems, consisting of various technological appliances, employing different skilled agents and often spreading on a multi-site worldwide environment. Simulation seems to be the appropriate technique to analyze and optimize such complex systems and has been applied to several cases. This paper examines the appropriateness of the simulation method on a case study where the modelling objectives are derived by the simulation outcomes. It facilitates the “interaction” between the researcher and the model, a process which can enhance the whole study and lead to useful conclusions. Furthermore, the presented simulation models incorporate a combination of aspects including a variable input schedule, multiple services, retrials, call routing, a complex resource allocation policy and queue abandonment phenomena. The methodology followed in the case study includes the assessment of the initial operation of a call centre and the evaluation of improvement scenarios. As shown in this paper, simulation can be applied on different phases of a call centre’s operation such as the evaluation of its performance, the improvement of its operation and the support of day to day activities