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An automatic generation of multiple-choice questions is one of the promising examples of educational applications of NLP techniques. A machine learning approach seems to be useful for this purpose because some of the processes can be done by classification. Using basic machine learning algorithms as Naive Bayes and K-Nearest Neighbors, we have developed a… (More)
Creating good proposals is critical to the success of many organizations. In spite of this, proposal generation is typically ad hoc, often inefficient and relies heavily on wisdom, skills and resources that participants accumulate informally over time. We studied the tactics that informants believed were helpful and how past content and successful… (More)
We present an internet-based system that helps teachers to make a cloze test on an online news article. The current system supports question making on grammar and vocabulary of English. The system works as an assistant to the teacher. It helps the user to choose an article, highlights grammar targets, suggests possible choices for the wrong alternatives,… (More)
This paper presents a pilot system and discusses its possible extensions. In the first sections, we present a web-based test authoring system for English grammar and vocabulary. It assists language teachers to make questions on arbitrary input texts, such as online news. The system employs the techniques of NLP (Natural Language Processing) and is compared… (More)
1 Aim Automatic generation of multiple-choice questions is an emerging topic in application of natural language processing. Particularly, applying it to language testing has been proved to be useful (Sumita et al., 2005). This demo presents an novel approach of question generation using machine learning we have introduced in (Hoshino and Nakagawa, 2005).… (More)
New strongylophorines-22 (1), -23 (2), -24 (3), and -25 (4) were isolated from the Okinawan sponge Petrosia (Strongylophora) corticata along with other known strongylophorines. The structures of these strongylophorines were determined on the basis of spectroscopic analysis and chemical conversions. Assessment was also made of the cytotoxicity of… (More)
Ten new 8,17-epoxybriarane diterpenoids, briaranolides A-J (1-10), were isolated from an Okinawan gorgonian Briareum sp. The structure of the diterpenoids was determined on the basis of spectroscopic analysis, chemical conversions, and X-ray analysis.
New polyhydroxylated sterols, stylisterol A-C (1-3), and a novel 5,19-cyclosterol, hatomasterol (4) were isolated from the Okinawan sponge Stylissa sp. Structural determinations of these compounds were made by spectroscopic analysis and chemical conversion. Assessment of cytotoxicity toward HeLa cells was also determined.
In real-world dirty data, errors are often not randomly distributed. Rather, they tend to occur only under certain conditions, such as when the transaction is handled by a certain operator, or the weather is rainy. Leveraging such common conditions, or “cause conditions”, the proposed data-cleansing algorithm resolves multi-tuple conflicts with high speed,… (More)
A practical synthesis of a key intermediate for the proteasome inhibitor lactacystin from (R)-4-hydroxymethyl-2-phenyl-4,5-dihydrooxazol-4-ylmethyl acetate was established. (R)-4-Hydroxymethyl-2-phenyl-4,5-dihydrooxazol-4-ylmethyl acetate is a useful chiral building block for the synthesis of biologically active compounds containing alpha-substituted… (More)