56,316 research outputs found
Kernelizing LSPE λ
We propose the use of kernel-based methods as underlying function approximator in the least-squares based policy evaluation framework of LSPE(λ) and LSTD(λ). In particular we present the ‘kernelization’ of model-free LSPE(λ). The ‘kernelization’ is computationally made possible by using the subset of regressors approximation, which approximates the kernel using a vastly reduced number of basis functions. The core of our proposed solution is an efficient recursive implementation with automatic supervised selection of the relevant basis functions. The LSPE method is well-suited for optimistic policy iteration and can thus be used in the context of online reinforcement learning. We use the high-dimensional Octopus benchmark to demonstrate this
Oscillatory convection in binary mixtures: thermodiffusion, solutal buoyancy, and advection
The role of thermodiffusive generation of concentration fluctuations via the
Soret effect, their contribution to the buoyancy forces that drive convection,
the advective mixing effect of the latter, and the diffusive homogenisation are
compared and elucidated for oscillatory convection. Numerically obtained
solutions of the field equations in the form of spatially extended relaxed
traveling waves, of standing waves, and of the transient growth of standing
waves and their transition to traveling waves are discussed as well as
spatially localized convective states of traveling waves that are surrounded by
the quiescent fluid.Comment: 30 pages, 10 figure
Top asymmetry and the search for a light hadronic resonance in association with single top
The exchange of a light -channel flavor-changing gauge boson, \Vp, with
mass remains a leading explanation for the anomalous forward
backward asymmetry in top quark production at the Tevatron. Unlike other ideas,
including heavier -channel mediators, the light \Vp model is not easily
seen in the \mtt distribution. We advocate a more promising strategy. While
current analyses at hadron colliders may not be sensitive, we propose searching
for a resonance in association with single top that may allow discovery in
existing data. Deviations in the lepton charge asymmetry in this sample should
also be present.Comment: 5 pages, 2 figur
Top quark asymmetry and dijet resonances
CDF recently reported an anomaly in the distribution of dijet events
produced in association with a boson. If this anomaly is associated with a
new flavor conserving vector resonance, , one might have expected to observe
effects in the analogous distribution produced in association with a
. No such excess is observed. A single flavor changing
coupling, however, can contribute to the anomaly while being
consistent with other resonance searches. Furthermore, it gives a potential
explanation of the observed forward-backward asymmetry in top quark production.Comment: 4 pages, 1 figur
Vietnamese women marriage migrants in South Korea: A study of their sense of well-being in the process of their settlement
The purpose of this study is to understand the experience of the Vietnamese women marriage migrants overcoming difficulties in the process of settlement in South Korea through international marriage, and to suggest the directions for achieving a stable settlement by maintaining their sense of well-being, based on the factors overcoming their difficulties. For this purpose, the research question in this study was set as: 'To what extent do the resources of Vietnamese women marriage migrants against the challenges in their settlement to South Korea influence their sense of well-being?' I applied the phenomenological method of Giorgi and Schütze’s biographical narrative interview method to analyse the interview data in the qualitative research methodology.
Participants of this study, the Vietnamese women marriage migrants, were found to have the curiosity and desire to live in a new country free from the reality of difficult family situations and a poor society, and they chose international marriage with great anticipation and longing for South Korea. However, they have gone through many difficulties during their settlement process. Two factors are crucial: Without enough information on their marriage migration, and their family’s strong opposition, led to their worries about international marriage before migration. Even after migration, they spent the time of pregnancy, childbirth and child care without the help of their husbands under the influence of their mothers-in-law who showed an authoritarian style within their family. Outside their family, they were discriminated against and ignored by South Koreans with added inconveniences caused by the unfamiliar surroundings and their limited communication.
The factors that overcome the difficulties and maintain their sense of well-being in the settlement process, are found in four aspects: internally, externally, transnationally, and demographically. The results of this study provide in-depth data not only to understand the experiences of the Vietnamese marriage migrants, but also to expand support programmes
and centres for their stable settlement in South Korean society
Field Tuning the G-Factor in InAs Nanowire Double Quantum Dots
We study the effects of magnetic and electric fields on the g-factors of
spins confined in a two-electron InAs nanowire double quantum dot. Spin
sensitive measurements are performed by monitoring the leakage current in the
Pauli blockade regime. Rotations of single spins are driven using
electric-dipole spin resonance. The g-factors are extracted from the spin
resonance condition as a function of the magnetic field direction, allowing
determination of the full g-tensor. Electric and magnetic field tuning can be
used to maximize the g-factor difference and in some cases altogether quench
the EDSR response, allowing selective single spin control.Comment: Related papers at http://pettagroup.princeton.ed
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