著者
大貫 正明 須田 義大 山口 大助
出版者
東京大学生産技術研究所
雑誌
生産研究 (ISSN:0037105X)
巻号頁・発行日
vol.60, no.4, pp.379-380, 2008 (Released:2008-08-27)
参考文献数
5

東京大学生産技術研究所先進モビリティ連携研究センターのサステイナブルITSプロジェクでは, 研究用ユニバーサルドライビングシミュレータの臨場感向上に取り組んできた.特に本シミュレータには6自由度の運動が可能な動揺装置にターンテーブル機構を付加し, 旋回時の自動車の挙動を忠実に模擬できるのが特徴である.これによりシミュレータ酔いの改善及びハンドル操作がより実車に近くなる一方, ターンテーブルの回転に対して横加速度の発生が少ないために後輪が滑っているという体感を感じ, 運転に違和感が生じたとの報告がある. 本稿では, 旋回時にターンテーブルの駆動によって生じる自転運動の大きさがドライバの評価にどのように影響するかについて報告する.[本要旨はPDFには含まれない]
著者
橋本 晴満 中西 雅典 渡辺 紀 田嶋 康宏 下 貴裕 市瀬 司 永野 尚登
出版者
公益社団法人 日本放射線技術学会
雑誌
日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日
vol.63, no.5, pp.595-602, 2007-05-20 (Released:2007-05-31)
参考文献数
4
被引用文献数
1 1

The DD-System is a dose-distribution system for analyzing the film method with a general-purpose flatbed image scanner. By analyzing the analogue digital conversion(ADC)value of each pixel acquired by the DD-system, we examined the technical problems of measurement with the scanner when making a dose-density table. When film of uniform density was measured, the ADC values distributed normally. Deviation of the values at the same pixel point on another time was about one-ten thousandth of the average. Deviation of the values from the time the scanner was turned on was in the same range. Although it may be negligible, the values measured at a peripheral area on the flatbed deviated about 2SD from the average measured at the central area. Further, deviation of the value obtained with a shade covering the outside of the irradiation field from that taken without the shade was about one thousandth. These deviations are not negligible. In the case of making a dose-density table with a DD-System and a general-purpose flatbed image scanner, the film should be set in the center of the flatbed, and the sampling area should be selected from those areas where the ADC values are distributed normally. Then proper data can be obtained and more accurate tables can be made.
著者
鈴木 孝昌
出版者
日本環境変異原学会
雑誌
環境変異原研究 (ISSN:09100865)
巻号頁・発行日
vol.25, no.2, pp.119-125, 2003 (Released:2005-08-19)
参考文献数
15
被引用文献数
1 1

The transgenic mouse mutation assay was developed as a striking new tool for mutation research in 1990. This assay enables the detection of mutations in a transgene in multiple organs including germinal tissues and thus reveals organ-specific genotoxicity of the mutagen. Following its introduction in MutaMouse and Big Blue mouse systems, modification of the methodology, mainly the introduction of the positive selection system and development of other transgenic animal models including rat, improved and assured the relevance of the assay. Accumulation of experimental data suggests the transgenic mouse mutation assay can be used as a standard in vivo test for mutagenesis.We have developed a multi-endpoint test, by combining the peripheral blood micronucleus assay with the transgenic mouse mutation assay. This test allows simultaneous detection of clastogenecity and mutagenecity in vivo. Since these two endpoints indicate different characteristics of the mutagen, data from many chemicals suggest the importance of detecting both endpoints. With this approach, the transgenic assay could detect the mutagenecity of diethylnitrosamine, which failed to be detected in micronucleus assay.Another important advantage of this assay is its suitability for sequence analysis. Sequencing of the transgene enables to draw mutagen-specific mutation spectrum, a molecular signature of the mutagen, and is very useful to deduce the mechanism of mutagenesis. In this regard, we have intensively used a positively selectable target gene ‘cII’. This gene is relatively short (300 bp) which made the sequencing process easier and less time consuming and enables us to generate data on mutagenesis of several mutagens. We hope the database will be useful for molecular epidemiology in future.A quantitative comparison of carcinogenic and mutagenic potency of chemicals revealed a good correlation with transgenic mutation assay and therefore suggesting a usefulness of this assay for the quantitative risk assessment.
著者
鈴木 輝彦 延澤 志保 太原 育夫
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会論文誌 (ISSN:13460714)
巻号頁・発行日
vol.24, no.1, pp.178-190, 2009 (Released:2009-01-06)
参考文献数
9

Tierra and Avida are well-known models of digital organisms. They describe a life process as a sequence of computation codes. A linear sequence model may not be the only way to describe a digital organism, though it is very simple for a computer-based model. Thus we propose a new digital organism model based on a tree structure, which is rather similar to the generic programming. With our model, a life process is a combination of various functions, as if life in the real world is. This implies that our model can easily describe the hierarchical structure of life, and it can simulate evolutionary computation through mutual interaction of functions. We verified our model by simulations that our model can be regarded as a digital organism model according to its definitions. Our model even succeeded in creating species such as viruses and parasites.
著者
平尾 努 鈴木 潤 磯崎 秀樹
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会論文誌 (ISSN:13460714)
巻号頁・発行日
vol.24, no.2, pp.223-231, 2009 (Released:2009-01-20)
参考文献数
17
被引用文献数
3 4 1

We derived the oracle summary with the highest ROUGE score that can be achieved by integrating sentence extraction with sentence compression from the reference abstract. The analysis results of the oracle revealed that summarization systems have to assign an appropriate compression rate for each sentence in the document. In accordance with this observation, this paper proposes a summarization method as a combinatorial optimization: selecting the set of sentences that maximize the sum of the sentence scores from the pool which consists of the sentences with various compression rates, subject to length constrains. The score of the sentence is defined by its compression rate, content words and positional information. The parameters for the compression rates and positional information are optimized by minimizing the loss between score of oracles and that of candidates. The results obtained from TSC-2 corpus showed that our method outperformed the previous systems with statistical significance.
著者
今別府 考洋 小野 智司 森重 綾太 黒瀬 元義 中山 茂
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会論文誌 (ISSN:13460714)
巻号頁・発行日
vol.24, no.2, pp.250-262, 2009 (Released:2009-01-27)
参考文献数
45
被引用文献数
1 1

Quantum-inspired Evolutionary Algorithm (QEA) has been proposed as one of stochastic algorithms of evolutionary computation instead of a quantum algorithm. The authors have proposed Quantum-inspired Evolutionary Algorithm based on Pair Swap (QEAPS), which uses pair swap operator and does not group individuals in order to simplify QEA and reduce parameters in QEA. QEA and QEAPS imitationally use quantum bits as genes and superposition states in quantum computation. QEAPS has shown better search performance than QEA on knapsack problem, while eliminating parameters about immigration intervals and number of groups. However, QEAPS still has a parameter in common with QEA, a rotation angle unit, which is uncommon among other evolutionary computation algorithms. The rotation angle unit deeply affects exploitation and exploration control in QEA, but it has been unclear how the parameter influences QEAPS to behave. This paper aims to show that QEAPS involves few parameters and even those parameters can be adjusted easily. Experimental results, in knapsack problem and number partitioning problem which have different characteristics, have shown that QEAPS is competitive with other metaheuristics in search performance, and that QEAPS is robust against the parameter configuration and problem characteristics.
著者
金子 弥生 丸山 直樹
出版者
日本哺乳類学会
雑誌
哺乳類科学 (ISSN:0385437X)
巻号頁・発行日
vol.45, no.2, pp.157-164, 2005 (Released:2006-12-27)
参考文献数
19
被引用文献数
1

東京都日の出町に生息するアナグマへの餌づけの影響を明らかにするために, 1990年~1997年に, 38頭のアナグマを捕獲し, 体重と体サイズ (首囲, 胸囲, 胴囲, 腰囲) を計測した. オスとメスでは餌づけへの依存度と体重の関係に差が見られ, 季節的に, 又は月に2,3回餌づけに依存するオスと, 毎週餌づけに依存しているメスは, 初春から春に非餌づけ個体より重い体重を示したが, 夏から初冬にかけては差がなかった. 毎週餌づけに依存しているオスは初春から初夏にかけて非餌づけ個体より重い体重を示した. 餌づけに毎日依存するメスは, 非餌づけ個体や他の餌づけ依存個体と比較して, 初春から初冬まで重い体重を示した. オスでは毎日餌づけに依存する個体は見られなかった. また, 非餌づけ個体や餌づけ依存度の低いオスや非餌づけ個体のメスでは, 胸や胴, 腰まわりの体サイズが体重と同様に春から冬に向かって増加することが明らかになった. しかし餌づけ依存度の高い個体にはこのような増加は見られなかった. 自然条件では, メスの授乳期やオスの交尾期の栄養供給を, 前年秋までに蓄積した体脂肪に頼ることになるが, 餌づけに依存する程度が高い個体の場合は, 活動のためのエネルギーを自然環境からの餌のみでまかなっている個体と比較して常に有利な蓄積状態を維持しているものと考えられる. このように, 日の出町のアナグマが採食効率の良い餌づけ場やゴミ捨て場などの人為的な餌を利用することは, 都市近郊の人為的撹乱の激しい生息環境において, アナグマ個体群が獲得した生活様式であるものと考えられるが, 交通事故や人工的な餌による個体群の膨張と崩壊, さらに農業被害, 野生動物としてのアナグマの生態の誤解などのさまざまな問題点を孕んでいる.
著者
中島 伸介 舘村 純一 原 良憲 田中 克己 植村 俊亮
出版者
日本知能情報ファジィ学会
雑誌
知能と情報 (ISSN:13477986)
巻号頁・発行日
vol.19, no.2, pp.156-166, 2007-04-15 (Released:2007-08-10)
参考文献数
14
被引用文献数
1 2 1

個人の情報発信やコミュニケーションツールであるblogの利用者が増加している.blog情報は社会的イベントに対する世論そのものであるとも考えられ,これを有効に利用することで即時性および重要性の高い情報の取得が可能であると考えている.そこで我々はWeb上の有識者としての重要なbloggerを発見し,この重要なblogger が発信するコンテンツを利用することで,信頼できる情報の取得が可能ではないかと考えた.本研究では,まずblog データモデルを定義し,重要なblogger の定義とそのタイプ分類を行った.その中でも特に重要と考えたAgitator の判別方法を提案すると共に,実データに基づいてその妥当性に関する考察を行った.提案手法の妥当性の検証方法としては,Agitator判別の再現性に関する検証と,Agitatorであると認定されたblogサイトの正当性の検証を行った.その結果から,提案手法によって重要なbloggerであるAgitator の発見が十分可能であることを示した.
著者
原田 雅史 舘 和幸 鈴木 泰彦 池野 順一 梅村 晋
出版者
一般社団法人 日本レオロジー学会
雑誌
日本レオロジー学会誌 (ISSN:03871533)
巻号頁・発行日
vol.34, no.2, pp.71-75, 2006 (Released:2006-06-14)
参考文献数
10
被引用文献数
2

Viscosity is a key property controlling the appearance of automotive coatings. However, the direct measurements of the viscosity in automotive coatings have not been achieved, since the automotive coating is a complex system consisting of a multilayer where mass transfer occurs between each thin layers. Using the laser trapping method, we have developed a rheometer to realize non-destructive viscosity measurements of the multilayers. Applying the new rheometer to automotive coatings, the viscosity has been estimated for (A) a clearcoat itself, (B) a clearcoat on a basecoat, and (C) a clearcoat on a basecoat and a surfacer. The results demonstrate an increase of viscosity in the order of (A) < (B) < (C), depending on the thickness of the lower layers. The viscosity increase suggests that the concentration of the clearcoat is likely to increase due to the diffusion of the solvent into the lower layers.
著者
照井 康輔 山納 康 小林 信一 齊藤 芳男
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)
巻号頁・発行日
vol.123, no.5, pp.475-480, 2003 (Released:2003-08-01)
参考文献数
9
被引用文献数
3 4

Oxygen-free copper electrodes stored in the atmosphere were used as test samples. Changes of field emission characteristics with 500 repetitive breakdowns and He ion beam sputtering were investigated in conjunction with analyses of electrode surface conditions by X-ray Photoelectron Spectroscopy (XPS). Experiments revealed that field emission currents were detected from electrodes used as the anode after 500 breakdowns, while for electrodes that were heavily contaminated and the cathode after 500 breakdowns field emission currents were not detected. Although anode and cathode surfaces were cleaned by 500 breakdowns, the cathode surfaces were more completely cleaned than the anode surfaces during repetitive 500 breakdowns. Residual carbon may play a role to dominate field emission characteristics and breakdown characteristics.
著者
Tetsuo YAMANO
出版者
Osaka Urban Living and Health Association
雑誌
SEIKATSU EISEI (Journal of Urban Living and Health Association) (ISSN:05824176)
巻号頁・発行日
vol.50, no.5, pp.359-364, 2006 (Released:2006-10-19)
参考文献数
17

Allergic contact dermatitis is an important and common health problem. It is known that the large number of chemicals used in household products, including biocides, dyes, rubber-accelerators, solvents, and UV-absorbers, have the inherent potential to cause skin sensitization. With cases of allergic contact dermatitis being reported constantly in many countries, the need for precise criteria is clear. In order to prevent the adverse health effects caused by exposure to skin-sensitizing chemicals, it is essential as a first step to identify sensitizing chemicals and quantitatively evaluate their potency. Such data have been obtained from animal experiments, especially with guinea pigs and mice. However, recent progress in computer technologies and mounting demands for priority to animal welfare have made it necessary to include other methods such as in silico prediction of quantitative structure-activity relationships and in vitro methods using cultured immunocytes. In the present article, recent methods of evaluating skin-sensitizing chemicals and of applying the data in the risk management process are reviewed.
著者
縄田 敬子 石田 裕美 山下 直子 上西 一弘
出版者
公益社団法人 日本産業衛生学会
雑誌
産業衛生学雑誌 (ISSN:13410725)
巻号頁・発行日
vol.48, no.5, pp.176-182, 2006 (Released:2006-10-24)
参考文献数
23
被引用文献数
2 6 4

首都圏在住の男性勤労者における歩数とBody Mass Indexの関係:縄田敬子ほか.女子栄養大学給食・栄養管理研究室―本研究では首都圏在住の男性勤労者の歩数とbody mass index(BMI)との関係を検討することを目的とした.対象者は310名(30~59歳)である.連続7日間の歩数および生活時間調査を行なった.歩数は歩数計を用いて測定した.また,生活時間調査の結果からエネルギー消費量を推定した.食物摂取頻度調査によりエネルギー摂取量を求めた.身長,体重は自記式の質問紙により調査した.BMI25以上の者は81名(26.1%)であった.出勤時の歩数は平均10,682±4,365歩,休日の歩数は7,135±4,536歩であった.エネルギー消費量は2,259±378 kcal,身体活動レベル(physical activity level:PAL)は1.5±0.1であった.エネルギー摂取量は1,974±488 kcalであった.出勤日,休日の歩数はPALと有意な正の相関関係を示した(出勤日r=0.301,休日r=0.296,いずれもp<0.001.)また,出勤日の歩数はBMIと有意な負の相関関係を示した(r=-0.188,p<0.01).出勤日の歩数とエネルギー摂取量の中央値を用いて対象者をI群(9,894歩以上,1,901 kcal未満),II群(9,894歩以上,1,901 kcal以上),III群(9,894歩未満,1,901 kcal未満),IV群(9,894歩未満,1,901 kcal以上)に分類した.IV群の平均BMIは24.7で,他の3群よりも有意に高値を示した.III群は生活習慣病の者の割合が最も多かった. (産衛誌2006; 48: 176-182)