6,257 research outputs found
Stylized facts and simulating long range financial data
We propose a new method (implemented in an R-program) to simulate
long-range daily stock-price data. The program reproduces various
stylized facts much better than various parametric models from
the extended GARCH-family. In particular, the empirically observed
changes in unconditional variance are truthfully mirrored in the simulated
data
Recursive estimation of piecewise constant volatilities
Returns of risky assets are often modelled as the product of a volatility function times standard Gaussian noise. This paper proposes a piecewise constant volatility function and shows how to construct such functions so that (i) the number of intervals of constant volatilities is minimized, and that (ii) these constant volatilities are equal to the root mean squared returns
The Dickey-Fuller-test for exponential random walks
We derive the probability limit of the standard Dickey-Fuller-test in the context of an exponential random walk. This result might be useful in interpreting tests for unit roots when the test is inadvertantly applied to the levels of the data when the "true" random walk is in the logs
Finite Density Results for Wilson Fermions Using the Volume Method
Nonzero chemical potential studies with Wilson fermions should avoid the
proliferation of flavor-equivalent nucleon states encountered with staggered
formulation of fermions. However, conventional wisdom has been that finite
baryon density calculations with Wilson fermions will be prohibitively
expensive. We demonstrate that the volume method applied to Wilson fermions
gives surprisingly stable results on a small number of configurations. It is
pointed out that this method may be applied to any local or nonlocal gauge
invariant quantity. Some illustrative results for at various values of in a quenched lattice simulation are given.Comment: 3pp, Dec. 94
Small-scale Intensity Mapping: Extended Halos as a Probe of the Ionizing Escape Fraction and Faint Galaxy Populations during Reionization
We present a new method to quantify the value of the escape fraction of
ionizing photons, and the existence of ultra-faint galaxies clustered around
brighter objects during the epoch of cosmic reionization, using the diffuse
Ly, continuum and H emission observed around galaxies at
. We model the surface brightness profiles of the diffuse halos
considering the fluorescent emission powered by ionizing photons escaping from
the central galaxies, and the nebular emission from satellite star-forming
sources, by extending the formalisms developed in Mas-Ribas & Dijkstra (2016)
and Mas-Ribas et al. (2017). The comparison between our predicted profiles and
Ly observations at and favors a low ionizing escape
fraction, , for galaxies in the range . However, uncertainties and possible systematics in
the observations do not allow for firm conclusions. We predict H and
rest-frame visible continuum observations with JWST, and show that JWST will be
able to detect extended (a few tens of kpc) fluorescent H emission
powered by ionizing photons escaping from a bright, , galaxy.
Such observations can differentiate fluorescent emission from nebular emission
by satellite sources. We discuss how observations and stacking of several
objects may provide unique constraints on the escape fraction for faint
galaxies and/or the abundance of ultra-faint radiation sources.Comment: 9 pages, 4 figures, re-submitted after referee report to Ap
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åãã®æžé¡ãåéã»ç¿»èš³ãïŒãããåºã«åç»ã®ã¹ã¯ãªãããäœæã§ãããThis paper describes the preliminary research and equipment design for a project to develop materials that aid professional staff to communicate in English at a Japanese hospital. A key aim is to make and organize videos in English supported by pedagogic tasks. In the paper, a situation, resource, and needs (SiReN) analysis is used, with a focus on technological resources and the English language needs of teams in hospitals.
In terms of the situation under study, the authors discuss the difference between the use of English in hospitals where the primary language of communication is English in contrast to hospitals in Japan, in which English is used as a Lingua Franca.
Regarding resources, the research team has built a mobile recording studio which can be used both in or near a hospital. It has been designed for high-quality audio and video recording, and it includes a simple teleprompter to aid in the reading of scripts. In addition, consideration is given to how materials can be organized on a learning management system that can be made available to staff.
In relation to needs, two hospital departments, gastroenterology and neurosurgery, are used to examine some of their communicative needs in English, and two treatments are described: polypectomy (the removal of small tumors from the colon) and the clipping of a cerebral aneurysm (a balloon-like weakness in the wall of a blood vessel in the brain). In the analysis that follows, several implications emerge: By researching a small number of departments, a variety of communicative needs in shared hospital areas can be included, such as in-patient care and scanning; two types of videos can be made, with one type describing processes and procedures, and the other providing verbatim instructions; hospital documents for patients can be collected and translated, then used as the basis for video scripts
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èŠãããããšã瀺åããŠããŸããIn the study presented here, the researchers used a learning management system (LMS) and videoconferencing software to deliver a first-year general writing course, taught using a process approach. The innovation at the heart of the research was the introduction of students commenting on regular homework assignments posted on the blog tool of the LMS. This peer commenting was combined with more traditional teacher feedback and automated feedback via the Grammarly software application.
The three authors were involved in teaching 22 groups of students in total, with the first author taking charge of 10 of those groups. Data were collected by two of the authors, covering 16 of the groups via an online survey involving both Likert scale answers and open-ended answers. The first author triangulated the survey data with assignments and peer comments. The three authors also discussed how they incorporated student commenting into their classes and their perceptions of the innovation.
The data indicate that peer commenting was generally viewed positively by both teachers and students. Many students became much more reader-conscious, formed connections with each other through writing and commenting, and communicated outside taught sessions. In addition, students learned from well-written assignments, as well as finding ways to encourage each other. However, data from the LMS, students, and teachers indicate that commenting can become repetitive, with the implication that commenting should be targeted at assignments most likely to stimulate studentsâ interest to respond
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åãååã«æããŠãããIn this article, we use Searleâs ideas on the logic of fiction and the construction of social reality to examine Joseph Conradâs short story âYouthâ, particularly in relation to the background theme of changing ship technology. To do this, we contrast the fictional voyage of the Judea in âYouthâ with the non-fictional voyage of the Palestine on which the story is based. In identifying the differences between the two, and in examining the ship technologies of the 1880s, we suggest that an important background theme in âYouthâ is the increasing dominance of steam over sail.
In the final part of the article, we consider the potential value of âYouthâ as a graded reader. It is an important part of a trilogy that includes Lord Jim and Heart of Darkness, with a very strong plot apposition between the voyage of the Judea in âYouthâ and the voyage of the Patna in Lord Jim. As both Lord Jim and Heart of Darkness have been converted into graded readers, âYouthâ would supplement these. As a short story, it does not need shortening for conversion into a graded reader, and there would be space for an introduction that highlights some key aspects of Conradâs writing, these being his use of embedded narrations and delayed decoding that appear throughout the trilogy. In addition, âYouthâ has an important theme of changing ship technologies that acts as an important background to the foregrounded behaviour of the shipâs officers and crew. Finally, simplicity of the plot combined with powerful visual scenes make it an attractive story to read
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æ¬çš¿ã®ååã§ã¯ïŒæ¥æ¬ã®å»åŠéšçã察象ãšãããå»åŠè±èªïŒEnglish for Medical Purposes, EMPïŒãã®ããã®ãèªåœãªã¹ãã®äœæããšãææéçºãã«é¢ãã6幎éã®ãããžã§ã¯ãã«ã€ããŠãŸãšãããå
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å®ã«è³ããããè¿°ã¹ãŠã¿ãããIn the first part of this article, we document and reflect on a six-year project to develop materials and a word list for undergraduates studying English for Medical Purposes (EMP) at a medical school in Japan. We describe the initial planning, early stage, mid-term innovation, and final stage of the project. We also recount how plans changed to reflect developing understandings of medicine and the need to consider both discourse and vocabulary together in order to create a word list embedded within the student materials. In addition, we note how plans for online materials were changed to create a flipped-learning course rather than a purely online course.
In the second part of the article, we discuss the relationship between general English and English for Medical Purposes, particularly with regard to vocabulary and grammar. We conclude by considering how further research on EMP could lead to a fully integrated English language curriculum for undergraduates
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