Faculty Profiles - HARADA Toshinobu

Published Papers - HARADA Toshinobu

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Extraction of Lines of Curvature and Analysis of Curves in the Natural Objects and Craftworks

Inoue Jiro, Harada Toshinobu, Imai Toshiyuki

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 54 ( 3 ) 39 - 46 2007 [Refereed]

Recently, the natural objects appeared in picture contents such as cartoon films or movies are made by CG. We need a great deal of labor for this production. It is because those objects are made by kansei of a creator or measuring the real objects troublesomely. Then, the aim of the study was to clarify visual languages (VLs) and the combination of VLs constituting curved surfaces of natural objects and craftworks, and to show a new possibility of making digital archives of them. First, we developed an extraction system of lines of curvature. Second, we extracted lines of curvature on the curved surfaces of a stone, wine glass, a sake bottle and computer mouse by the system. The extracted curves were projected on two planes of projection and we could get two plane curves. Lastly, these were divided into curves of monotone curvature. "Characteristic" of the curve was analyzed for them. As a result, we clarified VLs and the combination of VLs in natural objects and craftworks and got a possibility of the digital archive.

図面化のための視覚言語を用いたラフスケッチの清書化

河野正之, 原田利宣

人工知能学会全国大会論文集 ( 一般社団法人人工知能学会 ) 7 ( 0 ) 1H12 - 1H12 2007 [Refereed]

<p>現在，工業製品の形状設計に使用する曲線の創成は非常に多くの労力を必要とし，効率的でない。そこで，本研究ではデザイナが描いたスケッチを事例として用い，フェアリングされた曲線と同程度の美しい曲線を効率的に創成するシステムの開発を目的とした。具体的には，まずデザイナがなぞり描いた重なり合う曲線をひとつの図として認識させ，その濃淡の中央線を求める。次に求まった濃淡中央線を曲率単調曲線に分割し，各曲線の性質を分析して視覚言語に置換する。さらに，それら視覚言語を元の位置に再配置し，図面に利用可能な美しい曲線を得る。その結果，現状よりも効率よく美しい曲線を創成できる可能性が示された。</p>

Study on Comparison between Reducts Using Rough Sets and Quantification Method II Based on Preference Analysis of Watch

Enomoto Yusuke, Harada Toshinobu, Mizutani Masao

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 53 ( 5 ) 29 - 34 2007 [Refereed]

Recently, rough sets have attracted attention as a method for knowledge acquisition. However, there are few researches that verify the, characteristics of solutions by rough sets. Therefore, in this study, we aimed at inspecting differences between non-linear solutions calculated by rough sets and linear solutions calculated by quantification method II. At first, for 41 subjects, we investigated their preference about watches and classified these subjects to five clusters by their sense of values. Next, we analyzed their preferences from preference investigation using partial correlation coefficient by quantification method II and reducts by rough sets. Furthermore, we analyzed about a difference between linear solutions and non-linear solutions based on the analysis result. In addition, we calculated kendall's coefficient of concordance among preference criteria, linear solutions, and non-linear solutions. As a result, we clarified features of liner method and non-liner method.

Toward Contribution of Contents Design Support Technology to Public Based on Discussion at Near Future Challenge Session

平田圭二, 片寄晴弘, 笠尾敦司, 宮田一乗, 原田利宣

人工知能学会誌 = Journal of Japanese Society for Artificial Intelligence 21 ( 2 ) 244 - 244 2006.03 [Refereed]

Analysis of Specifications for a Web Screen-Design Using Rough Sets

Harada Toshinobu, Tanaka Ryousuke

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 52 ( 5 ) 1 - 6 2006 [Refereed]

Recently, a Web site has affected the impression of a company or a university. Few researches verified the relation between the composition elements of a Web site and sense of values using the nonlinear method like rough sets. Then, in this study, we made the Web site of the university belonging to a design and an information design field into a case study, and aim at clarification of the relation between the composition elements and the users' sense of values for the Web site. First, the evaluation questionnaire for sample Web sites was performed using six evaluation terms concerning the sense of value. Next, we analyzed the result of questionnaire by using multiple regression analysis, and clarified the evaluation terms affected the degree of charm. As a result, the subjects were classified by their sense of values at five clusters. Furthermore, the combinations of the composition elements of the Web site affected the degree of charm in each cluster were extracted using rough sets. As a result of verifying a new Web site on the basis of the above result, it was shown that an impression and charm are controllable.

Car Design and Curve

HARADA Toshinobu

Special issue of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 14 ( 1 ) 52 - 55 2006 [Invited]

Analysis of Specifications for Web Screen-Design Using Rough Sets.

Toshinobu Harada, Ryousuke Tanaka

JACIII 10 ( 5 ) 688 - 694 2006 [Refereed]

Analysis of visual language and syntax of car design(Prize for Encouragement)

HARADA Toshinobu

Special issue of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 13 ( 2 ) 40 - 41 2005 [Invited]

Optimization of Information Design in Car Navigation Considering Drivers' Sense of Value

Harada Toshinobu, Ozaki Nami

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 51 ( 6 ) 27 - 34 2005 [Refereed]

Although today's drivers have a different sense of valuing their cars, the Information design of car navigation systems (car-navis) has tended to be uniform. This research is aimed at clarifying the relation between drivers' impres-sions and elements that constitute car-navi Information design to optimize both speech and information. First, we did a survey on the sense of valuing cars and ITS, analyzed the results with PCA, and extracted seven elements. Next, eight samples were created through design experiments using the seven elements, and an evaluation experiment was conducted using the eight evaluation terms. As a result of analysis with a t-test, it became clear that the Information design element, which influences evaluation terms, is different depending on the driver's sense of value. Furthermore, we directed our attention to the icon as an important element. As a result of conducting an evaluation experiment on the icon, which changed the molding and color, we were able to obtain a valuable index in designing the icon.

Study on Comparison between Condition Parts of Decision Rules Using Rough Sets and Optimum Solutions Using Identity Mapping Model

Enomoto Yusuke, Harada Toshinobu

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 51 ( 5 ) 1 - 8 2005 [Refereed]

Rough sets has attracted attention as a method for knowledge acquisition. However, there are few researches which verify the availability by comparing rough sets with other methods except C4.5 proposed by Quinlan (1993). Therefore, in this study, we applied rough sets and an inverse reasoning system with a five layer neural network as methods for solving inverse problem. The aim of this study is to clarify the feature of condition parts of decision rules and optimum solutions. Concretely, we compared condition parts of decision rules with a high C.I. value obtained with optimum solutions obtained by exploring the entire range of solutions space. And we considered the feature of these methods. Moreover, we also compared the result of quantification method II with condition parts of decision rules. As a result, we were able to clarify the feature of each method.

Analysis of the Curves of Japanese Swords

Harada Toshinobu, Yoshimoto Fujiichi

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 51 ( 1 ) 77 - 84 2004 [Refereed]

For the Japanese, a Japanese sword has aesthetic origins, and it is also aesthetic standard for designers. However, there has been almost no research on the radii of the curvatures of Japanese swords; nor has the character of the curves been analyzed. This paper investigates the elements of the curves and the common features in 45 Japanese swords and 15 Japanese knives. Photographs of the swords and knives were scanned, and a set of points showing the curve of the edge of each blade was extracted by image processing. Next, an approximating curve was created from each set of points and the character of the curve has analyzed by a quantification method. Based on the analytical results, we considered the features and differences among these curves. Japanese swords were classified into five types, and Japanese knives were classified into two types. Moreover, we clarified the features in the curves of each type. We also proposed applications of the curves to industrial design.

Kansei and Rough Sets

Harada Toshinobu, Inoue Katsuo, Takahashi Yasushi, Mori Norihiko

Journal of Japan Society for Fuzzy Theory and Intelligent Informatics ( Japan Society for Fuzzy Theory and Intelligent Informatics ) 16 ( 5 ) 416 - 424 2004 [Invited]

Evaluation of Impression for Automobile Configuration Using VR System

Itou Kouichi, Harada Toshinobu

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 51 ( 1 ) 71 - 76 2004 [Refereed]

Configuration items which determine automobile layout and pro-portion are the most important elements on car design. The former research of automobile configuration used a 2-dimensional (2D) photograph, CG, etc. that lacked a live performance. Then, in this research, we performed more accurate design evaluation using VR system which could reproduce 3-dimensional (3D) vision, and aimed at clarifying the relation between each configuration item and the impression. First, configuration items of existing cars of 40 types were measured about their side and front views, and were analyzed using principal component analysis. VR models were created using the result of analysis and ware evaluated using 10 evaluation terms. Further, we investigated which configuration item had a strong relation with which terms using analysis of variance. Finally, the 3D models were created using the result of analysis, and we verified the possibility of controlling impressions.

Design Assistance by Example and Construction of Evaluation Basis

KATAYOSE Haruhiro, HIRATA Keiji, HARADA Toshinobu, HIRAGA Rumi, KASAO Atsushi

Transactions of the Japanese Society for Artificial Intelligence ( The Japanese Society for Artificial Intelligence ) 18 24 - 28 2003.11 [Refereed]

Design is one of the typical tasks which are realized with both intelligence and sense. When demands for contents are increasing in this decade, design assistance with computers is one of the most important information technology services. The design assistance method known as Kansei Engineering, which combines multivariate analysis of impression and media technology, is not always applicable to productive design tasks. In the practical productive design, concrete cases are sometimes picked up in advance of design processing. This paper, focusing on this design, describes the style of case-based design, assistance by computers, the range of application, and the evaluation of generated contents.

CURVES IN NATURAL AND FACTORY PRODUCTS

HARADA Toshinobu, YOSHIMOTO Fujiichi

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 50 ( 3 ) 55 - 62 2003

Many curves in natural products are comfortable for human eyes. If attractive curves, not so frequently used in the design of factory products, are found in natural products, we can apply them for a new shape design. In order to find the attractive curves, we propose a method for analyzing the characteristics of curves in natural and factory products using a curvature variation. The characteristics are classified into five types: divergent-, constant speed-, convergent-, divergent-convergent-, and convergent-divergent types. Using our method, we have analyzed many curves in the wings of butterflies and in the instrument panels of cars. As a result, it is observed that the ratio of divergent-convergent type curves is about twice to the curves of butterflies in contrast to the curves of cars. On the other hand, it is observed that the ratio of convergent type curves is about twice to the curves of cars in contrast to the curves of butterflies. Based on these observations, we show a new possibility of curve design for factory products.

Analysis of Choice for Audio Products Using Annexation Reduct System

Enomoto Yusuke, Harada Toshinobu, Inoue Takuya, Mori Norihiko

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 49 ( 5 ) 11 - 20 2003 [Refereed]

The rough set theory (Pawlak. 1982) which can acquire the combination of the fewest attribute for identifying a certain result began to be applied in the field of design research. Before, we proposed our algorithm which calculates common reducts among plural subjects (annexation reduct system) for applying the rough set theory to actual plans. Then, we aimed to extract reducts (requirements) which affect the user's choice about audio and aimed to make the requirements clear, using this system. In addition, we considered about the feature of the lineup of nine domestic audio makers using this result. First ,we surveyed a view of audio products, and classified subjects into four clusters. Next, we calculated reducts which affect user's choice and, we considered them. We were able to make the requirements which distinguish among each cluster's sense of value clear. Moreover, we considered how many products which suit the requirements of each cluster would exist in each maker's lineup. As a result, we were able to clear the feature of each maker's lineup.

Study on Key-line Curves of Faces using Curvature Analysis and FFT

Yamada Hiroko, Harada Toshinobu, Yoshimoto Fujiichi

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 50 ( 3 ) 1 - 8 2003 [Refereed]

Solid models (figure) and three-dimensional (3D) computer graphics models are often made on the basis of two-dimensional (2D) characters in games and animation works. The character design affects the animation works' popularity and quality. We consider that the importance of the character design to animation works tends to increase. Then, the aim of this study was to clear the differences among curves of these dolls' faces and how they were abstracted from human faces in order to acquire the knowledge for making the guide of the character design. First, we took figures, Japanese dolls and a licca dolls as the samples. Second, we measured 3D data of some dolls and human faces using 3D digitizers. And we got seven cross-sectional lines passing through the points expressing the face's features. We defined the cross-sectional lines as key-line curves of the faces. Third, we analyzed these cross-sectional lines using curvature analysis and FFT (Fast Fourier Transform), and made the faces of doll using the results as the guide of character design. As a result of the evaluation, we confirmed that we could make the models what haved each doll's features and the our guide was available.

Data fitting with a spline using a real-coded genetic algorithm.

Fujiichi Yoshimoto, Toshinobu Harada, Yoshihide Yoshimoto

Comput. Aided Des. 35 ( 8 ) 751 - 760 2003 [Refereed]

Comparison of Recognition between Faces and Car's Front View design

TAKAHASHI Noriya, HARADA Toshinobu, YOSHIMOTO Fujiichi

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 48 ( 5 ) 27 - 36 2002.01 [Refereed]

<p>We often compare cars' front view design to the human face. For example, we compare car's head lamps to the eyes or compare car's air intake to the mouth. We hypothesized that there was a certain relation between cars' front view design and the face on this fact. <br>Therefore, we aimed at clarifying how cars' front view design and the face are related from a viewpoint of an "image". First, the front view design and the face were classified into four clusters using principal component analysis and cluster analysis. Next, by applying the creation method of an "exaggeration drawing" in Furuya's and others studies, the "exaggeration drawing" in each cluster was created and they were compared. Consequently, we clarified that many form-features are in accord between the front view design and the face.</p>

PRODUCTION OF 'DRAWING CURVES' USING AN ELLIPSE FOR INDUSTRIAL DESIGN

HARADA Toshinobu, YOSHIMOTO Fujiichi

Bulletin of Japanese Society for the Science of Design ( Japanese Society for the Science of Design ) 49 ( 2 ) 9 - 16 2002

We proposed a quantitative analysis method of the characteristics of a curve, for finding what an aesthetic curve is. A number of curves drawn by designers were analyzed by this method. As a result, we found that the designer controlled the curvature change with a seif-affine property, when he produced a curve in design work. In other words, the designer sees a curve with a self-affine property as an aesthetic curve. On the basis of this fact, we developed five types of curves which have the self-affine property. Furthermore, we made 'drawing curves' from these curves as 'visual language'. We clarified that it was available to apply an ellipse to production of 'drawing curves'.

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