Yasuhisa Yoshida

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The current state-of-the-art single-document summarization method generates a summary by solving a Tree Knapsack Problem (TKP), which is the problem of finding the optimal rooted sub-tree of the dependency-based discourse tree (DEP-DT) of a document. We can obtain a gold DEP-DT by transforming a gold Rhetorical Structure Theory-based discourse tree(More)
Sentiment analysis is the task of determining the attitude (positive or negative) of documents. While the polarity of words in the documents is informative for this task, polarity of some words cannot be determined without domain knowledge. Detecting word polarity thus poses a challenge for multiple-domain sentiment analysis. Previous approaches tackle this(More)
Recent studies on extractive text summariza-tion formulate it as a combinatorial optimization problem such as a Knapsack Problem, a Maximum Coverage Problem or a Budgeted Median Problem. These methods successfully improved summarization quality, but they did not consider the rhetorical relations between the textual units of a source document. Thus,(More)
This paper describes our end-to-end PDTB-styled discourse parser for the CoNLL-2015 shared task. We employed a machine learning-based approach to identify discourse relation between text spans for both explicit and implicit relations and employed a rule-based approach to extract arguments of the discourse relations. In particular, we focus on improving the(More)
Previous research demonstrates that discourse relations can help generate high-quality summaries. Existing studies usually adopt existing discourse parsers directly with no modifications, hence cannot take full advantage of discourse parsing. This paper describes a new single document summarization system. In contrast to previous work, we train a discourse(More)
Osteoid osteoma of the calcaneus is rare and frequently misdiagnosed as arthritis because of similar symptoms. In addition, radiographic findings may be nonspecific, and magnetic resonance imaging (MRI) may show a bone marrow edema and changes in adjacent soft tissue. A 19-year-old man presented with a 6-month history of persistent pain and swelling in the(More)
INTRODUCTION Gliomas of the cerebellum are rare in adults, and their natural history and clinical behavior are not well known. Because cerebellar glioma is not usually diagnosed until clinical symptoms have appeared, no reports have described the developmental process of new cerebellar gliomas. We describe a case of de novo cerebellar anaplastic astrocytoma(More)
Recent studies on extractive text summarization formulate it as a combinatorial optimization problem, extracting the optimal subset from a set of the textual units that maximizes an objective function without violating the length constraint. Although these methods successfully improve automatic evaluation scores, they do not consider the discourse structure(More)
A 68-year-old man presented to our hospital with a 1-month history of slowly progressing altered mental status and gait disturbance. Magnetic resonance imaging and abdominal computed tomography revealed advanced pancreatic cancer (PC) with brain and para-aortic lymph node metastases. Gross total resection of the brain metastatic tumor was performed.(More)
The authors present a rare case of adult moyamoya disease in which a patient experienced rapid progression of cerebral infarction after intraventricular hemorrhage (IVH). A healthy 39-year-old woman was admitted to our hospital with sudden headache, a decreased level of consciousness and mild tetraparesis. Initial magnetic resonance imaging revealed small(More)
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