著者
大槻 明
出版者
情報知識学会
雑誌
情報知識学会誌 (ISSN:09171436)
巻号頁・発行日
vol.23, no.4, pp.429-441, 2013-12-07 (Released:2014-02-07)
参考文献数
18
被引用文献数
2 1

データには無限の可能性が秘められていると我々は考えている.そして,データを効果的に分析することにより,新たな知識発見や,学問や社会の発展に対し他大な貢献が期待できると考えられる.データ量が増えればそれだけこの期待度は高まっていく.さらに,現状はSNS(Social Network Service)データやセンサーデータなどを代表に膨大なデータがリアルタイムに生成されているため,これらのデータを効率的に取得あるいは分析する技術がトレンドとなっている.ゆえに,本稿では,先ずビッグデータの概要について述べ,次にビッグデータに関する代表的な技術について概観した後で,我々の研究事例を通してビッグデータ俯瞰分析の技術や手法の一例について述べる.
著者
須賀 潮美 須之部 友基
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:18847374)
巻号頁・発行日
vol.50, no.2, pp.137-140, 2003

Abstract The habitat utilization by <I>Halichoeres tenuispinni</I>s and <I>Stethojulis in-terrupta terina</I> (Labridae) on a rocky reef at Izu Ocean Park, the east coast of Izu Peninsula, Japan is described. A total of 17 labrid species was observed by monthly observations from August, 2000 to August, 2001. <I>H. tenuispinnis</I> and <I>S. i. terina</I> were abundant, comprising 54% and 23% of the 3, 464 labrid sightings, re-spectively. Both species occurred equally over areas of boulders, rocky flat, rocky slope, rocky-sand and sand. However, observations on feeding behavior revealed significant differences between the species in their utilization of microhabitats on each bottom condition.
著者
西 弘嗣 高嶋 礼詩
出版者
石油技術協会
雑誌
石油技術協会誌 (ISSN:03709868)
巻号頁・発行日
vol.70, no.1, pp.6-14, 2005 (Released:2007-06-01)
参考文献数
55
被引用文献数
1

The Indian subcontinent and Asian continent first contacted in the late Cretaceous (about 65Ma) and strongly collided after 52 Ma that is evidenced by slowed northward motion of the Indian Subcontinent from 18-20cm/yr to 4.5cm/yr. Although the first record of uplift in Himalayan regions has been recorded during the Eocene, major uplifts of the Himalayan Range and Tibetan Plateau and the subsequent sediment supply started from the Oligocene through Miocene. Particularly, the rapid uplift stages of Himalayan-Tibetan regions have been recognized, at least, around 8Ma and the last 1Ma based on sedimentological and paleonbotanical studies of marine and terrestrial sequences. The micropaleontological studies in marine sequences revealed that the increased elevations in the Himalayan-Tibetan regions forced a strong monsoonal circulation about 8 Ma, which produced intense upwelling around the Arabian Sea and more seasonal climate changes of terrestrial sequences around the southern Asia. The hypothesis that uplift of plateaus and mountains caused large-scale climate changes during the Cenozoic is still unknown. However, an enhanced chemical weathering due to tectonic uplift in the Himalayan-Tibetan regions may be explained as the active driving force of the Cenozoic global cooling at the beginning of 50 Ma.
著者
大用 庫智 市野 学 高橋 達二
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.30, no.2, pp.403-416, 2015-01-01 (Released:2015-01-22)
参考文献数
65
被引用文献数
4 5 4

Cognitive psychology and behavioral economics have shown that humans have cognitive biases that deviate from normative systems such as classical logic and probability theory. Considering that humans have the ability to understand the world from sparse and/or imprecise data, it is natural to assume that the biases in human have some ecological merits in adaptation. We focus on two cognitive biases, symmetry and mutual exclusivity, that are considered peculiar to human. In this study, with the framework of empirical Bayes, we clarify the implication of a model of human causal cognition, the loosely symmetric (LS) model [Shinohara 07]) that implements the cognitive biases. We show that LS has great descriptive validity in inductive inference of causal relationship (causal induction) with a meta-analysis and an experiment in causal induction. The result of another experiment strongly suggests that humans use the inductively inferred causal relationship to decision-making. Then we show that LS effectively works in sequential decision-making under uncertainty (N-armed bandit problems). Operating LS as a simple value function under the greedy method in the framework of reinforcement learning, we analyze its behavior in terms of cognitive biases or heuristics under uncertainty. The three cognitive properties resulting from the loose symmetry, comparative valuation, satisficing, and prospect theory-like risk attitudes, are shown to be the key of the performance of LS. We parameterize the reference for satisficing and show that the quite intuitive parameter enables optimization.
著者
土井 智晴 葭谷 安正
出版者
自動制御連合講演会
雑誌
自動制御連合講演会講演論文集 第57回自動制御連合講演会
巻号頁・発行日
pp.998-1000, 2014 (Released:2016-03-02)

災害列島日本のなかで,災害対応技術のひとつであるレスキューロボットに関心を持ち,学び,そして,研究者にまで育つ若いエンジニア(研究者)を育成することは重要なことである.そのため著者が各種機関と取り組んでいる行っている事業例として「防災リテラシー」,「防災をテーマにしたコンペティション」「防災支援機材の開発」を挙げ紹介し,効果的な防災教育について述べる.