Hirofumi Nonaka

• Ph. D
• Oita National College of Technology

Machine learning, Deep learning, and water quality data have been used in recent years to predict the outbreak of harmful algae, especially Microcystis, and analyze outbreak causes. However, for various reasons, water quality data are often High-Dimension, Low-Sample- Size (HDLSS), meaning the sample size is lower than the number of dimensions. Mor...

The measurement of work time for individual tasks by using video has made a significant contribution to a framework for productivity improvement such as value stream mapping (VSM). In the past, the work time has been often measured manually, but this process is quite costly and labor-intensive. For these reasons, automation of work analysis at the...

In current times, the importance of online hotel review sites has become more and more apparent. Users of these sites reference of reviews strongly influences their purchase behavior and as such, reviews are important to companies and researchers alike. The majority of review sites offer both text reviews and numerical hotel ratings, and both infor...

Precipitation and nitrate concentration was measured at shallow wells in the Miyakonojo Basin in February and August during 2007 - 2016. Correlation analysis was applied to investigate relations between the precipitation and nitrate concentration. In addition, since the Act on the Appropriate Treatment and Promotion of Utilization of Livestock Manu...

Since culture influences expectations, perceptions, and satisfaction, a cross-culture study is necessary to understand the differences between Japan’s biggest tourist populations, Chinese and Western tourists. However, with ever-increasing customer populations, this is hard to accomplish without extensive customer base studies. There is a need for...

Traditionally, mathematical optimization methods have been applied in manufacturing industries where production scheduling is one of the most important problems and is being actively researched. Extant studies assume that processing times are known or follow a simple distribution. However, the actual processing time in a factory is often unknown an...

For close monitoring of nitrate concentrations in groundwater, a method is proposed for interpolating nitrate concentrations at locations where they are not measured using spatiotemporal analysis. Conventionally, the interpolated nitrate concentrations are calculated using measured nitrate concentrations based on three factors: spatial distance fro...

Since culture influences expectations, perceptions, and satisfaction, a cross-culture study is necessary to understand the differences between Japan's biggest tourist populations, Chinese and Western tourists. However, with ever-increasing customer populations, this is hard to accomplish without extensive customer base studies. There is a need for...

Since its introduction, television has been the main channel of investment for advertisements in order to influence customers purchase behavior. Many have attributed the mere exposure effect as the source of influence in purchase intention and purchase decision; however, most of the studies of television advertisement effects are not only outdated,...

In response to the constant increase in population and tourism worldwide, there is a need for the development of cross-language market research tools that are more cost and time effective than surveys or interviews. Focusing on the Chinese tourism boom and the hotel industry in Japan, we extracted the most influential keywords in emotional judgemen...

Affected by urbanization, centralization and the decrease of overall population, Japan has been making efforts to revitalize the rural areas across the country. One particular effort is to increase tourism to these rural areas via regional branding, using local farm products as tourist attractions across Japan. Particularly, a program subsidized by...

With an increasingly large number of Chinese tourists in Japan, the hotel industry is in need of an affordable market research tool that does not rely on expensive and time-consuming surveys or interviews. Because this problem is real and relevant to the hotel industry in Japan, and otherwise completely unexplored in other studies, we have extracte...

In recent years, data posted about real estate on the Internet is currently increasing. In this study, in order to analyze user needs for real estate, we focus on "Mansion Community" which is a Japanese bulletin board system (hereinafter referred to as BBS) about Japanese real estate. In our study, extraction of keywords is performed based on the c...

Electronic word-of-mouth (eWOM) has become an important resource for the analysis of marketing research. In this study, in order to analyze user needs for consumer game software, we focus on tweet data. And we proposed topic extraction method using entropy-based feature selection based feature expansion. We also applied it to the classification of...

The scoring of patents is useful for technology management analysis. Therefore, a necessity of developing citation network clustering and prediction of future citations for practical patent scoring arises. In this paper, we propose a community detection method using the Node2vec. And in order to analyze growth potential we compare three ''time seri...

Scoring patent documents is very useful for technology management. However, conventional methods are based on static models and, thus, do not reflect the growth potential of the technology cluster of the patent. Because even if the cluster of a patent has no hope of growing, we recognize the patent is important if PageRank or other ranking score is...

Since its introduction, television has been the main channel of investment for advertisements in order to influence customers purchase behavior. Many have attributed the mere exposure effect as the source of influence in purchase intention and purchase decision; however, most of the studies of television advertisement effects are not only outdated,...

Since its introduction, television has been the main channel of investment for advertisements in order to influence customers purchase behavior. Many have attributed the mere exposure effect as the source of influence in purchase intention and purchase decision; however, most of the studies of television advertisement effects are not only outdated,...

We measured nitrate concentrations in the Miyakonojo Basin groundwater. The measurements were started in November 1995 and were conducted annually thereafter, mainly in February and August. It is necessary to ascertain the nitrate concentrations in the locations where they are not measured. Therefore, for this study, we developed a method to interp...

Electronic word-of-mouth (eWOM) has become an important resource for analysis of marketing research. In this study, in order to analyze user needs for consumer game software, we focus on tweet data. And we proposed topic extraction method using entropy based feature selection based feature expansion. We also applied it to the classification of the...

Scoring patent documents is very useful for technology management. However, conventional methods are based on static models and, thus, do not reflect the growth potential of the technology cluster of the patent. Because even if the cluster of a patent has no hope of growing, we recognize the patent is important if PageRank or other ranking score is...

Affected by urbanization, centralization and the decrease of overall population, Japan has been making efforts to revitalize the rural areas across the country. One particular effort is to increase tourism to these rural areas via regional branding, using local farm products as tourist attractions across Japan. Particularly, a program subsidized by...

The scoring of patents is useful for technology management analysis. Therefore, a necessity of developing citation network clustering and prediction of future citations for practical patent scoring arises. In this paper, we propose a community detection method using the Node2vec. And in order to analyze growth potential we compare three "time serie...

In current times, the importance of online hotel review sites has become more and more apparent. Users of these sites reference of reviews strongly influences their purchase behavior and as such, reviews are important to companies and researchers alike. The majority of review sites offer both text reviews and numerical hotel ratings, and both infor...

In response to the constant increase in population and tourism worldwide, there is a need for the development of cross-language market research tools that are more cost and time effective than surveys or interviews. Focusing on the Chinese tourism boom and the hotel industry in Japan, we extracted the most influential keywords in emotional judgemen...

Michi-no-eki is a roadside station, which provides information, offers facilities and space for taking rest, and promotes local cooperation in order to improve road and traffic environment and develop local economic activities in Japan. Recently, many new constructions of Michi-no-eki are planned to build. Unfortunately, the managerial performance...

We analyzed the relation between groundwater nitrate concentration and land use in the Miyakonojo basin. Nitrate concentration was measured in 1,202 wall in February and August from 2007 and 2016. Land use was based on 100m mesh data of National Land Numerical Information in FY 2009 and 2014, and was the ratio of land use type included within a cer...

In recent years, data posted about real estate on the Internet is currently increasing. In this study, in order to analyze user needs for real estate, we focus on “Mansion Community” which is a Japanese bulletin board system (hereinafter referred to as BBS) about Japanese real estate. In our study, extraction of keywords is performed based on calcu...

With an increasingly large number of Chinese tourists in Ja-pan, the hotel industry is in need of an affordable market research tool that does not rely on expensive and time consuming surveys or interviews. Because this problem is real and relevant to the hotel industry in Japan, and otherwise completely unexplored in other studies, we have extract...

We believe that Mitinoekis will help regional revitalization to be realized as regional bases and entrances. In this letter, in order to understand current situation analysis, we estimate the number of local residents who use Mitinoekis in regional areas. For the purpose, we classify Mitinoekis in rural village, underpopulated area and other ereas,...

We propose a method of reversible digital watermark for point cloud data which is measured by a laser scanner on an aircraft. The proposed method performs confidential communications by embedding a bit string to the height of point cloud data, and is added points equal to the number of the bits. We verify the processing time of the proposed method...

A patent map, a visual representation of related patent information, is an effective strategic tool for analysis of patent application trends. In particular, an effect-technology type patent map is commonly used as patent examinations are based on technology and effect terms of the inventions. However, conventional patent mining tools are not reali...

A patent map, a visual representation of related patent information, is an effective strategic tool for analysis of patent application trends. In particular, an effect-technology type patent map is commonly used because patent examinations are based on technology and effect terms of the inventions. However, the patent map creation is a costly task,...

Our group took part in the Patent Mining Task of the NTCIR-8. We proposed an extraction method of EFFECT and TECHNOLOGY expressions from a patent, respectively. In order to extract TECHNOLOGY expressions, we developed a method that uses Support Vector Machine and delimiters collected by using entropy-based score. On the other hand, our method for a...