Taking statistical machine translation to the student translator

Despite the growth of statistical machine translation (SMT) research and development in recent years, it remains somewhat out of reach for the translation community where programming expertise and knowledge of statistics tend not to be commonplace. While the concept of SMT is relatively straightforward, its implementation in functioning systems remains difficult for most, regardless of expertise. More recently, however, developments such as SmartMATE have emerged which aim to assist users in creating their own customized SMT systems and thus reduce the learning curve associated with SMT. In addition to commercial uses, translator training stands to benefit from such increased levels of inclusion and access to state-of-the-art approaches to MT. In this paper we draw on experience in developing and evaluating a new syllabus in SMT for a cohort of post-graduate student translators: we identify several issues encountered in the introduction of student translators to SMT, and report on data derived from repeated measures questionnaires that aim to capture data on students’ self-efficacy in the use of SMT. Overall, results show that participants report significant increases in their levels of confidence and knowledge of MT in general, and of SMT in particular. Additional benefits – such as increased technical competence and confidence – and future refinements are also discussed

Optical and Quasi-Optical Design and Analysis of Astronomical Instrumentation including a Prototype SAFARI Pixel

The work of this thesis focuses primarily on the quasi-optical analysis of optical systems in the Terahertz region of the spectrum. This included the development of novel simulation techniques based on the principles of mode matching and gaussian beam mode analysis, which are uniquely suited to the simulation of electrically large optical systems at millimeter wavelengths. Additionally, several commercial software packages were used and experimental measurements conducted for the purpose of both validating the newly developed simulation techniques, as well as simulating / measuring specific elements beyond the scope of the in-house software. The main drivers behind this work were a Technology Research Programme of the European Space Agency, the optical payload design of the future proposed Space Infrared-Telescope for Cosmology and Astrophysics mission and work on the Atacama Large Millimeter Array. Once the simulation tools were developed and proven an analysis of these optical systems was conducted. In the case of the Atacama Large Millimeter Array this involved the analysis of the proposed system, whilst for the other projects of the European Space Agency, although an initial optical system was proposed, much work was also required in maturing the design as well as conducting a standard analysis. This was carried out in conjunction with the other groups of the Technology Research Programme, which included the Terahertz optics group of NUI-Maynooth, the Space Research Organisation of the Netherlands, Rutherford Appleton Laboratory Space, and work groups of the universities of Cambridge and Cardiff. The work of this thesis also considered the technical feasibility and design of a future space mission for the purpose of characterising Earth-type exoplanets up to 30 pc distant. This involved the establishment of the science goals and the associated technical requirements, as well as a detailed optical design of the proposed spectropolarimetric payload

Investigating the effects of controlled language on the reading and comprehension of machine translated texts: A mixed-methods approach

This study investigates whether the use of controlled language (CL) improves the readability and comprehension of technical support documentation produced by a statistical machine translation system. Readability is operationalised here as the extent to which a text can be easily read in terms of formal linguistic elements; while comprehensibility is defined as how easily a text’s content can be understood by the reader. A biphasic mixed-methods triangulation approach is taken, in which a number of quantitative and qualitative evaluation methods are combined. These include: eye tracking, automatic evaluation metrics (AEMs), retrospective interviews, human evaluations, memory recall testing, and readability indices. A further aim of the research is to investigate what, if any, correlations exist between the various metrics used, and to explore the cognitive framework of the evaluation process. The research finds that the use of CL input results in significantly higher scores for items recalled by participants, and for several of the eye tracking metrics: fixation count, fixation length, and regressions. However, the findings show slight insignificant increases for readability indices and human evaluations, and slight insignificant decreases for AEMs. Several significant correlations between the above metrics are identified as well as predictors of readability and comprehensibility

Perturbative 2-body Parent Hamiltonians for Projected Entangled Pair States

We construct parent Hamiltonians involving only local 2-body interactions for a broad class of Projected Entangled Pair States (PEPS). Making use of perturbation gadget techniques, we define a perturbative Hamiltonian acting on the virtual PEPS space with a finite order low energy effective Hamiltonian that is a gapped, frustration-free parent Hamiltonian for an encoded version of a desired PEPS. For topologically ordered PEPS, the ground space of the low energy effective Hamiltonian is shown to be in the same phase as the desired state to all orders of perturbation theory. An encoded parent Hamiltonian for the double semion string net ground state is explicitly constructed as a concrete example.Comment: 26 pages, 4 figures, v2 published versio

Tensor Networks with a Twist: Anyon-permuting domain walls and defects in PEPS

We study the realization of anyon-permuting symmetries of topological phases on the lattice using tensor networks. Working on the virtual level of a projected entangled pair state, we find matrix product operators (MPOs) that realize all unitary topological symmetries for the toric and color codes. These operators act as domain walls that enact the symmetry transformation on anyons as they cross. By considering open boundary conditions for these domain wall MPOs, we show how to introduce symmetry twists and defect lines into the state.Comment: 11 pages, 6 figures, 2 appendices, v2 published versio

Swellable polymer substrates for use in magnetochemical and optical chemical sensing

Lightly cross-linked, animated polymers that swell and shrink with changing pH were prepared and evaluated. At low pHs amine sites protonate causing charge to accumulate along the polymer backbone. The polymer then swells to maximize the charge separation. The swelling of the polymer causes a change in a magnetic or optical property that can be measured and related to pH. Animated hydrogel membranes were prepared by copolymerizing dimethyl amino ethyl methacrylate(DMAEMA) with various comonomer hydrogels. Experiments were conducted to examine the effect of formulation on the ability of the hydrogel membrane to swell. Factors examined included cross-linker type, cross-linker concentration, DMAEMA concentration and comonomer hydrophilicity. Polymer microspheres were prepared using dispersion polymerization and seeded emulsion polymerization techniques. Poly-(vinyl benzyl chloride-co-2,4,5-trichloro phenyl acrylate)(VBC/TCPA) microspheres were prepared by dispersion polymerization. A factorial design experiment was carried out to examine the effect of monomer concentration, stabilizer concentration and water concentration on the size of VBC/TCPA particles stabilized with poly-acrylic acid. Microspheres were prepared using poly(vinylpyrrolidone) as the steric stabilizer. These particles were 0.6 mum in diameter and were used in optical sensing experiments. Seeded emulsion polymerization was used to produce porous particles of poly(VBC) with diameters of 1.3 mum. The pH sensitive hydrogel membranes were incorporated into two types of magnetochemical sensors; the magnetostatic coupled sensor and the magnetoelastic sensor. Both sensor designs responded to solution pH due to swelling or shrinking of the hydrogel. In addition, the magnetoelastic strip was evaluated for measuring viscosity and for monitoring polymerization processes. VBC/TCPA microspheres were used in several optical sensing methods. Poly(vinyl alcohol) membranes with VBC/TCPA microspheres were used to examine the feasibility of monitoring solution pH by surface plasmon resonance. A number of hydrogels of varying hydrophilicities with VBC/TCPA microspheres were examined by UV/Vis spectrophotometry, to examine the effect of membrane hydrophilicity on response for potential use in a remote fiber optic chemical sensor. The reproducibility of poly(VBC) microspheres in a HEMA membrane was examined. No change in response was observed after 100 swelling and shrinking cycles. Exposure to 80°C temperature or light for 40 days had only a small change on the magnitude of response