Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/itc-cscc55581.2022.9895067

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

DOI： 10.1117/12.2625967

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

DOI： 10.1117/12.2626047

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

DOI： 10.1117/12.2625978

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：情報処理学会  

これまでに人の嗅覚特性の調査や映像コンテンツへの香り情報付加の目的で嗅覚ディスプレイが開発されてきた．その中で，坂内らは空気流に対し香料を微小液滴として射出し気化させることで香料成分を利用者の鼻元まで輸送する液滴噴霧型嗅覚ディスプレイを開発した．このような嗅覚ディスプレイにおいて，香りを輸送する空気流に乱れが存在する場合，香料成分の利用者への到達量が変動し官能試験の精度が低下する可能性がある．本研究では空気流の安定化を目的とする整流格子を付加した流路構造を作成する．また格子間隔および奥行の異なる複数の整流格子を作成し，流路断面の流速分布の計測を行い嗅覚ディスプレイとして適切な流路構造を考察する．

J-GLOBAL

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：映像情報メディア学会  

To support mathematics learning, we propose an AR system that displays information on a desk. This system uses machine learning to recognize fingers from video images, and displays the formula corresponding to the problem pointed at. This improves time efficiency by reducing the time required to search for materials during learning. The results of the operation time during the experiment and the problem solving time showed that the proposed system was effective in speeding up the material search time and reducing the solving time.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Information and Engineering Technology Association  

DOI： 10.18280/ria.350301

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

This article proposes a training support system of holding chopsticks both for beginners and people with the wrong holding. Although eating with chopsticks is a part of East and Southeast Asian cultures, many people does not hold the chopsticks correctly. Since the posture of the holding is complex form in three dimensional space, two dimensional media such as textbooks and videos is insufficient for learning and training. Therefore, this article proposes a system, which acquires a trainee’s holding posture from a camera and a contactless motion sensor, and evaluates and represents the correctness of the posture in comparison of the correct one. Since the augmented reality (AR) technology is introduced into the representation, the system makes the trainee understand the difference easily.

DOI： 10.1117/12.2591033

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

The so-called “Kanbun,” the Japanese reading of the classical Chinese text, has been studied as a type of the classical Japanese in secondary education in Japan. In Kanbun the word order is changed based on symbols called “return mark,” which is converted into a Japanese reading. This change is often so complicated that it may cause phobias in learning for junior and senior high school students in Japan. Therefore in this paper, a visualization system of step-by-step change of word order is proposed, which recognizes the return marks on the classical Chinese text and visually superimposes the converted text beside the original one, in the use of the augmented reality (AR) technology. The proposed system is applicable to any Kanbun sentences so that it is expected to contribute to improved student understanding.

DOI： 10.1117/12.2591030

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

A Piano is a popular musical instrument. Development of playing piano requires frequent and suitable practice. However, the learners often have difficulty on space and time for practice due to less portable size and weight of the piano. In this article, a portable and virtual-reality (VR) based self-training system of the piano is proposed, which is installed on a standalone see-through Head-Mounted-Display (HMD). A learner wearing the HMD can see both of superimposed virtual piano keyboard and virtual his/her own fingers. According to his/her keying by the fingers, the system represents the situation acoustically. Evaluation of training outcome (number of incorrect keying) and subjective assessment shows advantages of the proposed system in comparison of a piano playing application on a tablet device.

DOI： 10.1117/12.2591031

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

A gas burner is often used in science experiments in Japanese lower secondary school education, and its correct operating procedures are included in the study content. However, students are given only inadequate learning opportunities for the operating procedures with the actual gas burner, due to time and instrumentation constraints. Therefore, this article proposes an operation learning system of a gas burner using virtual reality technology with high realistic sense to supplement the learning with the real one. The proposed system provides interactivity through a dial controller and a pair of hand controllers as an input device, and a stereoscopic HMD as an output device. The dial controller imitates an adjusting screw, so that a learner can easily get a realistic sense of turning screws for air and gas. Also judging whether the user’s operation is correct or not, the system displays necessary information on the virtual scene of the gas burner for learning to promote the learner’s understanding.

DOI： 10.1117/12.2591010

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

Regular evacuation drills from fire have the advantage that many people can participate at the same time. However, during training, you just walk down the corridors and passageways as usual, and it lacks a realistic feel, especially with flames and smoke. Since the number of facilities with realistic flames and smoke is limited, it is difficult to conduct drills with such realities in schools and workplaces. In this paper, we propose a system that uses mixed reality (MR) technology to simulate fire and smoke during an evacuation drill at a school or workplace. The proposed system uses a transparent head-mounted-display (HMD) to move through the real world, so that the system provides trainees with a highly realistic image of flames and smoke superimposed on the evacuation route. In addition, the appropriateness of the evacuation action is assessed by recording the route and time of the action, and the results are presented to the trainees at the end of the exercise to improve the effectiveness of the exercise.

DOI： 10.1117/12.2591015

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

DOI： 10.1117/12.2591013

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE Digital Library  

Among characteristic club activities in Japanese fisheries high schools, demonstration of dismantling tunas and other fishes dismantling is attractive to consumers as well as to students. In spite of the extracurricular education, the school has difficulties to provide enough chances the students to practice of the dismantling due to their cost. To improve the situation, this article proposes a virtual reality support system of self-study for tuna dismantling. The system provides visual sense through Head-Mounted-Display (HMD) with interactive manipulation of some kinds of knives by both hands. Through the experience of the virtual world, students can study correct procedure with safety and accuracy of the dismantling. From the user test for fisheries high school students, the system shows its effectiveness on the learning outcome of the dismantling.

DOI： 10.1117/12.2590966

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Giving chances of hands-on experience is important for K-12 education, in order to make students obtain deep understanding. However, there is less opportunities of such experience in science education in Japan, due to some reasons. Therefore, in this paper, a virtual reality system is proposed with which the students can interactively experiment the dissection of vertebrate animals. Through a series of four stages in VR space, the proposed system provides a learner to learn the inner structure of the animal and the procedure of the dissection. Also giving the haptic sense in use of the vibration on the hand controllers, the system represents difference between alive and dead, so that the learner has a chance to think of the animal ethics.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

We have developed the olfactory display that can change multiple type of aroma in 0.1 second units in order to examine the response to human olfactory stimuli or use for virtual reality contents. This olfactory display diffuses aroma essence into the air, and the diffused aroma components are delivered to the system user's nostrils by airflow from fan, thereby presenting olfactory information. In this paper, we estimated the latency of olfactory information presentation in the olfactory display with computational fluid dynamics simulations in order to synchronize the presentation of olfactory information with videos. From the results, the latency of this olfactory display was estimated to be about 0.15 second.

DOI： 10.1109/GCCE50665.2020.9291839

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Other Link： https://dblp.uni-trier.de/db/conf/gcce/gcce2020.html#SetaMBH20

Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：日本VR学会  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：ゲーム学会  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：The Korean Society of Visualization  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

The correct posture and procedure are essential for effective and injury-free strength training. Although it is necessary to know the differences between the postures and procedures of the trainer and the trainee, it is difficult for the trainee to know them during training without the presence of the trainer. Therefore in this article, we propose a mixed reality (MR) system which uses motion capture to recognize a trainee's posture on a HMD. Through the system, the trainee can train while looking his/her own postures on a HMD. Also the PC with the motion sensor can be placed some distance away since the HMD is connected with the PC wirelessly.

DOI： 10.1117/12.2591035

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

DOI： 10.1117/12.2521576

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

DOI： 10.1117/12.2521438

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：電子情報通信学会  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ECTI Association  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ECTI  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ECTI  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEICE  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEIE  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEIE  

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Language：Japanese   Publisher：情報処理学会  

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Language：Japanese   Publisher：CG・可視化研究会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Multimedia University, Malaysia  

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Language：Japanese   Publisher：情報処理学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Multimedia University, Malaysia  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

DOI： 10.1299/jsmecmd.2016.29.4_216

CiNii Research

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Korean Society of Mechanical Engineers  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEICE  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEICE  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEICE  

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Language：Japanese   Publisher：IPSJ  

近年，衣料品市場が伸び悩んでいる原因として，衣料品市場の e コマース (EC) 化の縮小が考えられる．衣料品市場の EC 化縮小の一因は消費者がネット通販では衣料品を試着できないことであり，自宅で試着できるシステムの普及が必要である．それは消費者が自宅で手軽に行える必要があり，AR を用いた仮想的な試着システムが適している．既存システムに大型ディスプレイにユーザの全身を映すものがある．しかし，これは大型ディスプレイを使用するため自宅用としての普及に適していない．そこで本研究では，手軽に大型ディスプレイと同じ感覚を得られ，近年普及しつつあるヘッドマウントディスプレイ (HMD) と Web カメラ，そして鏡を用いた仮想試着システムを提案する．提案システムとして HMD 上に風景画像と，Web カメラから取得した映像上に衣類の CG を重畳した映像を表示する衣類選択支援システムを開発した．

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Language：Japanese   Publisher：IPSJ  

近年登場している VR 向けハードウェアやコンテンツでは，視覚から没入感を高める傾向が強い．しかし，今後の市場成長を大きくするためには，ユーザの操作に焦点を当てたシステムの普及が必要である．そこで本研究では利用者の没入感を向上するために，入出力画面を分離した仮想現実感システムにおける UI を設計し，その有用性を検証した．提案UIは入力デバイスであるディスプレイ上での利用者の操作を取得し，かつ，利用者が操作する有形オブジェクトを認識する．それにより，ユーザの動作と仮想空間におけるオブジェクトの動きの整合性を高める．提案 UI を備えたアプリケーションを構築し，それに対するユーザテストで有用性を検証した．

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Language：Japanese   Publisher：一般社団法人 電子情報通信学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE INSTITUTE OF ELECTRONICS AND INFORMATION ENGINEERS  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE INSTITUTE OF ELECTRONICS AND INFORMATION ENGINEERS  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

For virtual reality (VR) environment with interactivity, this paper proposes a real-time computer graphics (CG) rendering method, which can represent bubbles released in carbonated water. In the method, two types of bubbles are considered, which are, generated on the liquid surface at the water pouring, and ones generated in a container. The proposed method consists of 1) simulation of bubbles' behavior and 2) real time rendering. In the first step, we introduce the smoothed particle hydrodynamics (SPH) method into the simulation of the bubbles' behavior, which can calculate particles' movement in the deformable water at relatively low computational cost. Also the SPH method is executed under the parallel computing on a graphics processing unit (GPU). In addition, in this method we propose bubbles generation model using state transition of particles. This model consider that keeping total mass and volume constant. In the second step, we also use the GPU to render CG images in real-time.
The proposed method is evaluated by three aspects; reality, real-time and interactivity. By comparing with photographs/movies taken in the real world, we confirm that the proposed method has necessary reality. Also we confirm real-time computation with interactive manipulation. Therefore we conclude that the proposed method can be applied in a VR environment where some glasses/cups filled with poured carbonated water.

DOI： 10.1109/CW.2015.62

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

This paper proposes an interactive risk visualization system to enable people to understand intuitively the risk of snow sliding from a roof. The system represents the risk as a colored bar and real-time computer graphics (CG) images simulated by the smoothed-particle hydrodynamic method (SPH). First, snow behavior is defined as fluid-based dynamics. Second, the risk is visualized in two ways with real-time CG of the snow sliding on a graphics processing unit (GPU). One is a colored bar along the ground where the snow hits, and another is numerical value for a zone where a viewer supposes to be safe from the snow sliding. Such visualization gives an intuitive understanding to the viewer. The viewer can interactively and graphically manipulate the conditions, such as the accumulated mass of snow, the pitch of the roof, and the zone where the viewer supposes to be safe. From the evaluation of the system on both aspects of intuitive understanding of the risk and usability, its effectiveness is especially shown to users who live in little snowfall regions and have few knowledge about the dangerous. Therefore, we conclude that the proposed system performs as a self-study tool about the safety from snow sliding.

DOI： 10.1109/CW.2015.61

Web of Science

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IIEEJ  

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Language：Japanese   Publisher：IDE大学協会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人 電子情報通信学会  

DOI： 10.1587/essfr.7.299

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publisher：画像電子学会  

CiNii Books

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Language：Japanese   Publisher：画像電子学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人 映像情報メディア学会  

本稿では,情報セキュリティ専門職ではないものの情報システム管理業務を担当する者が仮想的にセキュリティインシデント初期対応を体験できるシステムを提案する.提案システムは学習と体験の2モードで構成される.学習モードでは脅威に関する情報がテキストおよび静止画像で提示される.体験モードでは,アニメーションを用いて脅威や対策による効果を表現する.また,多人数でタッチ操作が行え,かつオブジェクト認識機能を備えたMicrosoft PixelSenseを用いることで,提案システムに高い操作性と対話性を具備させる.これにより,提案システムは実学が困難なセキュリティインシデントについて対話的に仮想体験させることができ,利用者の知識定着と理解度向上を図れる.

DOI： 10.11485/itetr.37.17.0_239

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Language：Japanese   Publisher：一般社団法人 映像情報メディア学会  

本稿では,総合大学のような多様な分野に属する研究者集団の傾向を可視化する対話型システムを提案する.提案システムでは,研究者データベースに収録されている個々の研究者の研究分野やキーワードをもとに研究者ネットワークを構築し,CGにより可視化する.これにより,研究分野ごとの層の厚さや,複数の分野に所属することが一般的な研究者同士のつながりの把握を容易にする.また,提案システムが実装されるMicrosoft PixelSenseが持つマルチタッチ機能を用いることで,複数名による同時対話操作を可能にし,情報のより容易な把握を実現する.

DOI： 10.11485/itetr.37.17.0_229

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer Verlag  

In order to let administrators know their QOS of wireless LAN both in convenience and safety of service range, an interactive and immersive visualization of high frequency electromagnetic wave propagation on the CAVE has been studied with authors, which represents the propagation as the volume data defined by the beam tracing technique with sets of three rays. In the previous study, we used distributed computing on the tracing and successive algorithm to generate the volume data. Through this way, the authors reduced the waiting time largely. However, the accuracy of generated beam need to be improved. Especially the method of division of beam which is from one zone enter the another zone must be improved. In the previous system, we just stack the intensity of electromagnetic wave which enter into the new zone, but have not considered about the direction of the ray. Therefore in this paper, we aim at making the method of division to get better. © Springer-Verlag Berlin Heidelberg 2013.

DOI： 10.1007/978-3-642-45037-2_14

Scopus

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Language：Japanese   Publisher：一般社団法人 映像情報メディア学会  

本稿では,複数名によるブレインストーミング法(BS法)の中で,カードを用いてアイデアを纏める手法の利用者を支援するシステムを提案する.提案システムはMicrosoft PixelSenseを用いて複数人同時マルチタッチやテーブル型を活かしたUIを実現し,Eメールを用いた入力方法によってデータの同時入力を可能とする.また,中間・最終成果物の保存を装備することで,作業の一時中断・復帰の容易化や成果物同士の比較を実現する.

DOI： 10.11485/itetr.37.17.0_19

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER-VERLAG BERLIN  

In order to let administrators know their QOS of wireless LAN both in convenience and safety from service range, an interactive and immersive visualization of high frequency electromagnetic wave propagation on the CAVE has been studied by authors. In the previous study, to make volume data of the propagation may take a lot of time in advance of displaying them on the CAVE. Therefore in this paper, improvement on reduction of user's waiting time is considered. Successively making volume data with priority is introduced, instead of reduction of making volume data with less quality. Also, applying multi-thread programming to the proposed improvement, we balance visualization with the making data. Finally, we can view and operate more rapidly and conveniently the propagation through the new interactive visualization system.

Web of Science

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

システムと信号処理サブソサイエティ4研専は,平成22年から合同研究会を開催している.合同研究会の意味をより深めるために,サブソ会長を座長に,各研専委員長または各研専の代表者をパネラーとしたパネルディスカッションを開催する.近年のICT技術の発展は,システムの高機能化・高信頼化・高安全性を実現したが,一方で大規模・複雑化し,高度なシステム・信号処理技術が必要となっている.システムと信号処理サブソサイエティの4研専は,システム・信号処理技術の基礎を支える研専として相補的な関係にある.そこで,お互いに各研専の研究分野を理解し,サブソのより一層の活性化につながるような研専の枠を超えた新たな活動を考えるキックオフ的なパネルディスカッションとなることを目指す.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publisher：電子情報通信学会  

Quality assurance of higher education has been becoming a big issue in Japan as well as in the world, due to active mobility of workers and students. Accreditation systems for higher education in major countries have already moved into "outcomes-based" assessment. For that, we are now facing problem what and how we should provide educational contents at the entry level in universities. The Technical Group on Circuits and Systems, IEICE (IEICE CAS) surveyed current education of electrical circuit, which is basic knowledge in wide engineering disciplines. Through the small survey and forthcoming surveys and discussions we expect that our possible solution will come out.

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute for Art and Science  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute for Art and Science  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute for Art and Science  

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

JABEE (日本技術者認定機構)は2009年に一般社団法人化し、認定審査を含む体制がより充実の方向に進んでいる。また、既に告知済みの通り2010年度から JABEE認定基準の改定が適用されるほか、IEA Graduate Attributesなど国際動向への適合性の向上に向けた取り組みが進んでいる。そこで、2010年度改定の認定基準の内容や経過措置を中心に平易な解説を行い、最近のJABEEの動向も含めて以下の内容について説明する。

CiNii Books

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Language：Japanese   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Publisher：The Institute of Electronics, Information and Communication Engineers  

DOI： 10.1587/essfr.4.157

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：IEEK  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE COMPUTER SOC  

In this paper, we propose a concept and present CRAYON, a three dimensional (3D) solid modeling system on the CAVE, to realize a user's concept to a virtual world. CRAYON adopts a set of rules for conversion of a linear drawing into a solid in order to realize what a user wants to get. Considering positions of line vertices, CRAYON determines the position and size of a solid, and displays it on the virtual world. Additionally, through CRAYON, a user can change solids' color, size and position with easy operation. These support a user to put combination of solids into the 3D object pictured in his/her mind.

DOI： 10.1109/ICIG.2009.80

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会 芸術科学会  

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Language：Japanese   Publisher：電子情報通信学会 電子情報通信学会  

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Language：Japanese   Publisher：電子情報通信学会 電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：National Chiao Tung University National Chiao Tung University  

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper presents an interactive visual simulation system of visibility which can automatically search better viewpoint than a given initial viewpoint. Previous research is calculation and representation system of visibility for a target object using computer graphics (CG) technology. Therefore we propose interactive visual simulation system which expand previous research. The proposed system provides us the effective surveillance information numerically and visually. The system has a feature of searching better viewpoint than a given initial viewpoint. As a result, the proposed system is helpful for security cameras/guards setting in various situation.

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

In this paper, a real-time volume visualization of the left ventricle (the left chamber of the heart) is presented, according to human digital volumetric data provided. Visualizing the part of heart precisely and volumetrically, the proposed method represents it realistically. For dynamic motion, the method applies a mass-spring model to the muscle contraction, which is caused by excitation of action potential at each part of the muscle. Combining the diffusion of the action potential at each region in the ventricle with the mass-spring model for deformation, the proposed method achieves over 20fps volume rendering of the situation. The method enables us understand the function of the heartbeat, especially influence of the diffusion of the action potential on the heartbeat. Therefore the method can contribute mainly to the primary and secondary education.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会 芸術科学会  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

CiNii Books

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：中央大学理工学研究所 中央大学理工学研究所  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

For providers and customers of wireless communication systems using high frequency electromagnetic wave such as wireless LAN and cellular phone, it is important to know an electromagnetic wave propagation situation. Therefore, a representation method of the propagation situation in urban space is necessary, which can show at least summary of coverage, reliability and leakage through showing the propagation situation according to configurations and instructions of a user. We have proposed an interactive system with a three dimensional map data, which can calculate and show the propagation situation. In the proposed method, combining a beam tracing method with adaptive subdivision with three dimensional GIS(Geographic Information System), we can analyze and visualize a propagation situation. However, since the proposed method can be applied to three dimensional map data composed by a set of triangular meshes, the method is not so efficient for buildings and roads which are usually defined as polygons. Therefore in this paper, we propose an improved method which can handle polygons directly. The proposed method can benefit reduction of number of both of objects to be checked in the beam tracing and the adaptive subdivision.

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper proposes a visual lighting simulation under foggy condition in which the ray tracing method with probability is introduced. Since water particles generating fog are sufficiently larger than wavelength of visible light, geometric optics is introduced to the ray tracing, while some scattering theories are applied to case of shorter wavelength. Each ray is supposed to go through a series (sequence) of cubic voxels. Each voxel contains a water particle representing fog. Calculating probability of intersection between the ray and the particles, we determine a voxel where the ray intersects with a particle. Therefore, the proposed method works fast and efficiently by avoiding unnecessary calculation of intersection of rays with all particles in the series of voxels along the rays, respectively.

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE COMPUTER SOC  

In this paper, a definition of visibility of objects will be proposed for generalized 3D art gallery problem, to which the ray tracing algorithm is introduced. The proposed visibility provides level of direct/indirect surveillance from single/multiple viewpoints such as cameras and/or guards, which takes 3D location, mirroring/transmitting, dust effect and obstruction into account. Also a prototype of interactive visualization system will be shown, which makes us easily understand the situation through displaying both the visibility and a CG scene from any viewpoint.

DOI： 10.1109/ICIG.2007.169

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会 芸術科学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science Society for Art and Science  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

CiNii Books

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Language：Japanese   Publisher：日本シミュレーション学会 日本シミュレーション学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：映像情報メディア学会  

For providers and customers of wireless communication services such as cellular phone and wireless LAN, to know high frequency electromagnetic wave propagation is concerned with two important matters : one is to know whether we can use the services or not, and another is to know whether our information may be secure or leak by the services. To keep our lives convenient and secure, techniques detecting and showing the propagation situation are useful. We have proposed a beam tracing method with adaptive subdivision, which analyzes and visualizes a propagation situation in three dimensional space. For any point in the object space, power of a propagation is calculated by beams passing through the point, which are defined by a set of three rays. In this paper, an efficient calculation of the power will be proposed, in which the power is not calculated in an area out of sight. The proposed method achieves faster visualization than the previously proposed method, with keeping quality of visualization in a user's sight.

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：GESTS  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：映像情報メディア学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：映像情報メディア学会  

The ray tracing algorithm is well-known as one of the most popular rendering techniques in computer graphics. In the ray tracing, tracing the rays and calculating intersection between rays and objects are essential. Since usually a ray having no thickness is defined for each pixel of the image, the image may include aliasing. For anti-aliasing, one of the authors proposed an adaptive distributed ray tracing in the use of the automatic differentiation. However, number of initial rays are determined by resolution of prospective image. Therefore it takes longer time as we need larger image. Expanding the method to detection of variation over pixels. an adaptive method is proposed to determine from which pixels initial rays should be radiated. Since unnecessary initial rays are not calculated, the proposed method benefits more efficient calculation of ray tracing.

CiNii Books

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publisher：芸術科学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：GESTS  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：GESTS  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Research Society on Nonlinear Theory and its Applications, IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Research Society on Nonlinear Theory and its Applications, IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Research Society on Nonlinear Theory and its Applications, IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEK IEEK  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science Society for Art and Science  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science Society for Art and Science  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOSBE KOSBE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOSBE KOSBE  

In this paper, a visual simulation with view-dependent culling and level-of-detail (LOD) is proposed, which represents efficiently high frequency electromagnetic wave propagation used in wireless communication systems. In order to solve difficulty of interactive visualization of volume data representing the propagation in large and complex urban space, view-dependent culling of volume data is introduced, which are generated by beam tracing. In addition to applying LOD to definition of the volume data, number of volume data is restricted within a limit under which can generate and visualize the data interactively. Consequently, the proposed system can visualize the propagation with both of necessary precision and interactive manipulation.

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOSBE KOSBe  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INTERNATIONAL ACADEMIC PUBLISHERS LTD  

Virtual reality environment has great potential to display various types of information in three-dimensional space. In this paper, an interactively stereoscopic visual simulation with view-dependent Culling and level-of-detail (LOD) is presented, which targets high frequency electromagnetic wave propagation in wireless communication systems such as wireless LAN. Considering a trade-off between interactive visualization and precise representation of volume data of the propagation in large and complex urban space, view-dependent culling of volume data is introduced, which are generated by beam tracing. In addition to applying LOD to the definition of volume data, the number of volume data is restricted within a limit under which can generate and visualize the data interactively. The proposed method is installed and performs well on the CAVE, a multi-faced stereoscopic display system.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE IEICE  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society for Art and Science Society for Art and Science  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

In this paper, we propose an adaptive beam division method for a visual simulation of high frequency electromagnetic wave propagation. In order to guarantee the correctness of visualization and calculate electromagnetic wave power within beam (transformation from beam data to, volume data) with low computational cost, an adaptive beam division technique is introduced into the beam data structure. By implementation of the proposed method, one can transform beam, data to volume data more correctly with lower computational cost and visualize the high frequency electromagnetic wave propagation by a so-called ray-casting algorithm, which is one of the most useful methods in computer graphics.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

The research on computer graphics (CG) has been actively studied and developed Namely, many surface/solid models have been proposed in the field of computer aided geometric design as well as the one of CG. Since it is difficult to visualize the complex shape exactly, an approximation by generating a set of meshes is usually used Therefore it is important to guarantee the quality of the approximation in consideration of the computational cost.
In this paper, an adaptive mesh generation algorithm will be proposed for a surface defined by Lie algebra, which is useful in the field of computer vision. The proposed algorithm considers the variation of normal vectors with automatic differentiation around the calculated point on the surface. By the method a set of meshes for the surface can be generated adoptively and automatically with high quality at low computational cost. And in order to apply to the Realtime System such as CAVE, determine the adaptive resolution considering the viewpoint.

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publisher：Helsinki University of Technology  

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Language：English   Publisher：Helsinki University of Technology  

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Language：English   Publisher：The Institute of Electronics Engineers of Korea (IEEK)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：芸術科学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Electromagnetics Academy  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：(社)電子情報通信学会  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

In the field of computer graphics (CG), some adaptive methods have been proposed in order to make CG images more real in relatively low computational cost. As one of such adaptive methods, in this paper, an adaptive method will be proposed for detection of edges and approximation of surfaces in the use of the so-called automatic differentiation. In the proposed method a CG image with high quality can be generated in suitable computational cost. In this paper, three cases will be considered. The first is ail adaptive distributed ray tracing which can adaptively generate anti-aliased CG images in suitable computational cost. The second is a high quality triangular meshing, which guarantees accuracy of the generated meshes according to shape of given surface in suitable computational cost. The last case is used in the so-called radiosity method.

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Electronics, Information and Communication Engineers  

In order to analyze easily electro-magnetic propagation of mobile communication systems in urban areas, methods with visualization techniques are useful. In consideration to a 2-D urban area with buildings and obstructions as a tessellation made up of equilateral triangles, in this paper a methd based on ray tracing method is proposed. The method can obtain an approximate propagation profile efficiency, in the use of the dual graph expressing the tessellation, and the result can be easily visualized.

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Electronics, Information and Communication Engineers  

In order to analyze urban propagation environment of electromagnetic waves, in this paper a beam tracing method with subdivision technique is proposed, in which the beam is generated by a set of three rays. According to reflection of the rays on the buildings and/or ground, additional rays are generated adaptively and the beam is subdivided automatically. After generation of the set of beams, the obtained electromagnetic wave propagation data can be easily transformed into volume data. Then one can visualize the data of propagation with interaction at any viewpoint by the so-called ray casting algorithm, which is one of the most useful methods in computer graphics.

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Recently, the research on computer graphics (CG) has been actively studied and developed. Namely, many surface/solid models have been proposed in the field of computer aided geometric design as well as the one of CG. Since it is difficult to visualize the complex shape exactly, an approximation by generating a set of meshes is usually used. Therefore it is important to guarantee the quality of the approximation in consideration of the computational cost.
In this paper, an adaptive mesh generation algorithm will be proposed for a surface defined by Lie algebra, which is useful in the field of computer vision. The proposed algorithm considers the variation of normal vectors around the calculated point on the surface. By the method a set of meshes for the surface can be generated adaptively and automatically with high quality at low computational cost.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

In this paper, a simplified visualization method is proposed for geographic information systems (GIS) in consideration of weather and sun moving. In order to decrease computational cost in visualization, the proposed method consists of 2 parts; pre-process for generating textures and main process for rendering. In the main process, buildings and roads with shadows are visualized by the ray tracing algorithm. Also in the process, sky, snow, and rain are visualized by textures, which are a priori generated in the pre-process. In the pre-process, some textures such as snow and rain are generated by the ray casting algorithm. Then we can obtain images with weather condition and shadows of sunlight by buildings along the road. It is seen that the computational cost for the main part becomes relatively low in spite of representing shadows and weather.

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Recently, the research on computer graphics (CG) has been actively studied and developed. Namely, many surface/solid models have been proposed in the field of computer aided geometric design as well as the one of CG. Since it is difficult to visualize the complex shape exactly, an approximation by generating a set of meshes is usually used. Therefore it is important to guarantee the quality of the approximation in consideration of the computational cost.
In this paper, an adaptive mesh generation algorithm will be proposed for a surface defined by Lie algebra, which is useful in the field of computer vision. The proposed algorithm considers the variation of normal vectors around the calculated point on the surface. By the method a set of meshes for the surface can be generated adaptively and automatically with high quality at low computational cost.

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Pay tracing is well known as one of the most popular rendering techniques in computer graphics. In the algorithm tracing rays from a viewpoint and calculation of intersection between rays and objects are essential. Since the rays are usually defined as piecewise lines precisely, they can not include the neighbor situation even if the neighbor is very close. Therefore the rays must be distributed, i.e., additional rays must be defined along with the original ones in order to obtain the neighbor situation. In this paper we introduce the so-called automatic differentiation to detection whether the rays are to be distributed or not. In the proposed method each calculation, of the ray tracing has its differentiation with respect to coordinates and time. Then we can discover where the rays need distribution. This approach makes the distribution adaptive so that the computational cost becomes low.

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

In this paper, a simplified visualization method is proposed for geographic information systems (GIS) in consideration of weather and sun moving. In order to decrease computational cost in visualization, the proposed method consists of 2 parts; pre-process for generating textures and main process for rendering. In the main process, buildings and roads with shadows are visualized by the ray tracing algorithm. Also in the process, sky, snow, and rain are visualized by textures, which are a priori generated in the pre-process. In the pre-process, some textures such as snow and rain are generated by the ray casting algorithm. Then we can obtain images with weather condition and shadows of sunlight by buildings along the road. It is seen that the computational cost for the main part becomes relatively low in spite of representing shadows and weather.

Web of Science

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this paper, a high quality triangular meshing is proposed with automatic differentiation, which guarantees accuracy of the generated meshes according to shape of given surface. Also with the use of the proposed method, a generation method of isoclinic line of the surface is proposed. The method is useful for visualization and computer geometric design (CAGD) as well as computer graphics (CG).

CiNii Books

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Language：English   Publisher：Computers and Communications (ITC-CSCC2000)  

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Language：English   Publisher：Computers and Communications (ITC-CSCC2000)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Computers and Communications (ITC-CSCC2000)  

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Language：English   Publisher：Computers and Communications (ITC-CSCC2000)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

In order to analyze the urban propagation environment of electromagnetic waves, we propose a beam tracing method with a subdivision technique, in which the beam is generated by three rays. According to reflection of the rays on the buildings or ground, additional rays are generated adaptively and the beam is subdivided automatically. After generation of the set of beams, we transform the electromagnetic wave propagation data into volume data. Then one can visualize the data of propagation at any viewpoint by the so-called ray casting algorithm, which is one of the most useful methods in computer graphics.

DOI： 10.1109/TENCON.1999.818469

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

In order to analyze the urban propagation environment of electromagnetic waves, we propose a beam tracing method with a subdivision technique, in which the beam is generated by three rays. According to reflection of the rays on the buildings or ground, additional rays are generated adaptively and the beam is subdivided automatically. After generation of the set of beams, we transform the electromagnetic wave propagation data into volume data. Then one can visualize the data of propagation at any viewpoint by the so-called ray casting algorithm, which is one of the most useful methods in computer graphics.

DOI： 10.1109/TENCON.1999.818469

Scopus

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Related with accuracy, computational complexity and so on, quality of computing for the so-called homotopy method has been discussed recently. In this paper, we shall propose an estimation method with interval analysis of region in which unique solution path of the homotopy equation is guaranteed to exist, when it is applied to a certain class of uniquely solvable nonlinear equations. By the estimation, we can estimate the region a posteriori, and estimate a priori an upper bound of the region.

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Electronics, Information and Communication Engineers  

Related with accuracy, computational complexity and so on, quality of computing for the so-called homotopy method has been discussed recently. In this paper, we shall propose an estimation method with interval analysis of region in which unique solution path of the homotopy equation is guaranteed to exist, when it is applied to a certain class of uniquely solvable nonlinear equations. By the estimation, we can estimate the region a posteriori, and estimate a priory an upper bound of the region.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：（社）電子情報通信学会  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：日本ファジィ学会  

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In this paper a priori estimation method is presented for calculating solution of convex optimization problems (COP) with some equality and/or inequality constraints by so-called Newton type homotopy method. The homotopy method is known as an efficient algorithm which can always calculate solution of nonlinear equations under a certain mild condition. Although, in general, it is difficult to estimate a priori computational complexity of calculating solution by the homotopy method. In the presented papers, a sufficient condition is considered for linear homotopy, under which an upper bound of the complexity can be estimated a priori. For the condition it is seen that Urabe type convergence theorem plays an important role. In this paper, by introducing the results, it is shown that under a certain condition a global minimum of COP can be always calculated, and that computational complexity of the calculation can be a priori estimated. Suitability of the estimation for analysing COP is also discussed.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

An estimation method of region is presented, in which a solution path of the so-called Newton type homotopy equation is guaranteed to exist, when it is applied to a certain class of uniquely solvable nonlinear equations. The region can be estimated a posteriori, and its upper bound also can be estimated a priori.

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Institute of Electronics, Information and Communication Engineers  

For the so-called Newton type homotopy method,Relationship is discussed between an upper bound of computational complexity of the method,and a region in which uniquie solution is guaranteed to exist,when the method is applied to a certain class of uniquely solvable nonlinear equations.The proposed method is discussed based on Urabe type theorem,which guarantees the convergence of the simplified Newton method.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

A priori estimation is presented for a computational complexity of the homotopy method applying to a certain class of strongly monotone nonlinear equations. In the present papers, a condition is presented for a certain class of uniquely solvable equations, under which an upper bound of a computational complexity of the Newton type homotopy method can be a priori estimated. In this paper, a condition is considered in a case of linear homotopy equations including the Newton type homotopy equations. In the first place, the homotopy algorithm based on the simplified Newton method is introduced. Then by using Urabe type theorem, which gives a sufficient condition guaranteeing the convergence of the simplified Newton method, a condition is presented under which an upper bound of a computational complexity of the algorithm can be a priori estimated, when it is applied to a certain class of strongly monotone nonlinear equations. The presented condition is demonstrated by numerical experiments.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

In this paper, we are concerned with a problem of obtaining an approximate solution of a finite-dimensional nonlinear equation with guaranteed accuracy. Assuming that an approximate solution of a nonlinear equation is already calculated by a certain numerical method, we present computable conditions to validate whether there exists an exact solution in a neighborhood of this approximate solution or not. In order to check such conditions by computers, we present a method using rational arithmetic. In this method, both the effects of the truncation errors and the rounding errors of numerical computation are taken into consideration. Moreover, based on rational arithmetic we propose a new modified Newton iteration to obtain an improved approximate solution with desired accuracy.

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A type of infinite dimensional homotopy method is considered for numerically calculating a solution curve of a nonlinear functional equation being a Fredholm operator with index 1 and an A-proper operator. In this method, a property of so-called A-proper homotopy plays an important role.

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Association for Mathematics and Computers in Simulation  

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In this paper, in the first place, a slightly version upped Urabe type theorem of convergence criterion is presented for the modified Newton method. Then, based on this theorem, a posteriori stopping criterion is presented for a class of numerical methods of calculating solutions including the simplicial approximate homotopy method for nonlinear equations. By this criterion it is estimated whether an approximate solution satisfies the conditions of the Urabe theorem or not. Finally, it is shown that under a certain mild condition a class of simplicial approximate homotopy methods such as Merrill's method generate an approximate solution which satisfies our stopping criterion in restarting finite steps.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electrical and Electronics Engineers, Inc.  

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Related to the problem such as determination of the operating point for the nonlinear resistor circuit equation, remarkable progress has recently been observed in the global solution method for the finite‐dimensional nonlinear equation, called the homotopy method. This paper attempts to extend the homo‐topy method to the infinite dimensional nonlinear equation (functional equation) such as the equation for the semiconductor devices. First, two streams are pointed out as the theoretical frameworks for the homotopy method for the finite‐dimensional equation, which are: (1) the characterization of the solution structure for the nonlinear equation
and (2) the tracing of the solution trajectory. It is then pointed out that the Fredholm operator equation can be considered as a class of infinite‐dimensional equations, which can characterize the set of solutions as in item (1). The existence theorem for the solution in the finite‐dimensional homotopy method is extended to the class of Fredholm operator equations. Then it is pointed out that the A‐proper operator equation can be considered as a class of infinite‐dimensional equations, for which the computational algorithm for the solution can be described as in item (2). Based on the constructive theorem for the existence of the solution in the finite‐dimensional homotopy method, it is shown that the solution for the particular class of A‐proper operator equations can always be determined by numerical calculation. Finally, an application to the controllability problem is discussed. Copyright © 1991 Wiley Periodicals, Inc., A Wiley Company

DOI： 10.1002/ecjc.4430740801

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A priori estimation is presented for a computational complexity of the homotopy method applied to a certain class of hybrid equations for nonlinear strongly monotonic resistive circuits. First, an explanation is given as to why a computational complexity of the homotopy method cannot be a priori estimated for calculating solutions of hybrid equations in general. In this paper, the homotopy algorithm is considered in which a numerical path‐following algorithm is executed based on the simplified Newton method. Then by introducing Urabe's theorem, which gives a sufficient condition guaranteeing the convergence of the simplified Newton method, it is shown that a computational complexity of the algorithm can be a priori estimated when applied to a certain class of hybrid equations for nonlinear strongly monotonic resistive circuits whose domains are bounded. This paper considers two types of path‐following algorithms: one with a numerical error estimation in the domain of a nonlinear operator
and one with a numerical error estimation in the range of the operator. Copyright © 1991 Wiley Periodicals, Inc., A Wiley Company

DOI： 10.1002/ecjc.4430741109

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