Nakashima, Masahiro, Ichikawa, Kazuhide, Nagata, Ryo, Yokoyama, Jun'ichi
We investigate constraints on the time variation of the fine structure constant between the recombination epoch and the present epoch, $\Delta\alpha/\alpha \equiv (\alpha_{rec} -...
Reinforcing English Countability Prediction with One Countability per Discourse Property (2009)
Countability of English nouns is important in various natural language processing tasks. It especially plays an important role in machine translation since it determines the range of possible...
A Feedback-Augmented Method for Detecting Errors in the Writing of Learners of English (2009)
This paper proposes a method for detecting errors in article usage and singular plural usage based on the mass count distinction. First, it learns decision lists from training data generated...
Nagata, Ryo, Yokoyama, Jun'ichi
The primordial curvature fluctuation spectrum is reconstructed by the maximum likelihood reconstruction method using the five-year Wilkinson Microwave Anisotropy Probe data of the cosmic microwave...
Constraints on the time variation of the fine structure constant by the 5-year WMAP data (2008)
Nakashima, Masahiro, Nagata, Ryo, Yokoyama, Jun'ichi
The constraints on the time variation of the fine structure constant at recombination epoch relative to its present value, $\Delta\alpha/\alpha \equiv (\alpha_{\mathrm{rec}} -...
Nagata, Ryo, Yokoyama, Jun'ichi
The primordial curvature fluctuation spectrum is reconstructed by the cosmic inversion method using the five-year WMAP data of the cosmic microwave background temperature anisotropy. We apply the...
Saito, Ryo, Yokoyama, Jun'ichi, Nagata, Ryo
We show a text-book potential for single-field inflation, namely, the Coleman-Weinberg model can induce double inflation and formation of primordial black holes (PBHs), because fluctuations that...
A Method for Recognizing Noisy Romanized Japanese Words in Learner English (2008)
NAGATA, Ryo, KAKEGAWA, Jun-ichi, SUGIMOTO, Hiromi, YABUTA, Yukiko
This paper describes a method for recognizing romanized Japanese words in learner English. They become noise and problematic in a variety of systems and tools for language learning and teaching...
A Method for Reinforcing Noun Countability Prediction (2007)
NAGATA, Ryo, KAWAI, Atsuo, MORIHIRO, Koichiro, ISU, Naoki
This paper proposes a method for reinforcing noun countability prediction, which plays a crucial role in demarcating correct determiners in machine translation and error detection. The proposed...
制度:新 ; 文部省報告番号:乙1993号 ; 学位の種類:博士(経済学) ; 授与年月日:2005/11/15 ; 早大学位記番号:新4119
A Statistical Model Based on the Three Head Words for Detecting Article Errors (2005)
NAGATA, Ryo, IGUCHI, Tatsuya, MASUI, Fumito, KAWAI, Atsuo, ISU, Naoki
In this paper, we propose a statistical model for detecting article errors, which Japanese learners of English often make in English writing. It is based on the three head words — the verb head,...
WMAP constraints on scalar-tensor cosmology and the variation of the gravitational constant (2003)
Nagata, Ryo, Chiba, Takeshi, Sugiyama, Naoshi
We present observational constraints on a scalar-tensor gravity theory by $\chi^2$ test for CMB anisotropy spectrum. We compare the WMAP temperature power spectrum with the harmonic attractor model,...
Observational Consequences of Evolution of Primordial Fluctuations in Scalar-Tensor Cosmology (2002)
Nagata, Ryo, Chiba, Takeshi, Sugiyama, Naoshi
Evolution of primordial fluctuations in a Brans-Dicke type scalar-tensor gravity theory is comprehensively investigated. The harmonic attractor model, in which the scalar field has its harmonic...