著者
林 晃平 中川 慧
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会第二種研究会資料 (ISSN:24365556)
巻号頁・発行日
vol.2022, no.FIN-029, pp.67-72, 2022-10-08 (Released:2022-10-01)

株価や経済指標などの金融時系列は,一般に長期記憶性や不確実性など,単純なモデルでは再現の難しい特徴を持つことが観測されており,このことは金融市場の複雑性を反映していると考えられる.一方,このような金融時系列は実データであるためサンプル数が十分でなく,しばしば観測データを用いた定量的な分析を困難にする.本研究の目的は,このような複雑性を持つ時系列を機械学習の手法を用いて人工的に生成することである.これにより,より現実に近い様々な市場局面を大量に生成することができ,投資戦略のストレステストや,経済指標を用いた分析・リスク管理等を効果的に行うことが可能となる.特に,本発表では標準 Brown 運動よりも正則性の低い極めて「ラフな」パスが観測されているボラティリティを対象にし,非整数階 Brown 運動を用いた生成手法である Neural rough fractional SDE-Net を用いて元データの特性を再現することを目指す.
著者
西村 貴士 林 晃平 山田 外史 岩原 正吉
出版者
公益社団法人 日本磁気学会
雑誌
日本応用磁気学会誌 (ISSN:02850192)
巻号頁・発行日
vol.30, no.3, pp.387-390, 2006 (Released:2007-02-21)
参考文献数
7

It is important to understand leakage magnetic fields surrounding magnetic machines and devices for facilitation of development and evaluating the environmental effects of the magnetic field level to determine whether it conforms to the EMC guideline. The magnetic projection method is a measurement technique that can detect a leakage magnetic field by means of a simple probe. The principles of 2-D magnetic field measurement and reconstruction have been previously reported. This paper proposes the principles of a spherical magnetic projection method, and reports on an experiment carried out to observe the overall leakage magnetic field around a sample object. As a result, it is shown that the projection method can easily measure and visualize a magnetic field on a spherical surface with good accuracy.
著者
林 晃平
出版者
苫小牧駒澤大学
雑誌
苫小牧駒澤大学紀要
巻号頁・発行日
no.4, pp.73-94, 2000-09
著者
林 晃平
出版者
苫小牧駒澤大学
雑誌
苫小牧駒澤大学紀要
巻号頁・発行日
no.1, pp.89-116, 1999-03
著者
林 晃平
出版者
国文学研究資料館
雑誌
国際日本文学研究集会会議録 = PROCEEDINGS OF INTERNATIONAL CONFERENCE ON JAPANESE LITERATURE (ISSN:03877280)
巻号頁・発行日
no.24, pp.33-54, 2001-03-01

There seem to have been several rules untouched in the story in terms of picturing the Urashima legend. Focusing on these, Urashima's clothes of the time when he returned from Ryûgû is one of them. In most picture scrolls Urashima is dressed in eboshi-kariginu, which is usually yellowish brown with some exceptions of which being yellow green. In my opinion, there might have been the rules among painters or the consensus about the image of visitors from a different world.There are cases misunderstanding itself expands the pictures. Some of the picture scrolls of Urashima in the early modem times contain the scene that okina-ôna(an old couple), a woman and Urashima are sitting facing each other. The scene is set between the times he catches the turtle and he stays with Otohime at Ryûgû, but the story doesn't have the description matching the scene. It seems that it happened because the original scene that Ryuô and Otohime welcome Urashima was redrawn as if the scene is set in our real world. Also, in the picture of his journey to Ryûgû, a boy is rowing the boat which is originally supposed to have only a woman aboard. It can be also guessed that the boy Urashima was described as a man with sakayaki and, with a lag between pictures, the picture was redrawn as the one explained above.The typical model of Urashima legend described from the early modern times to the modern times is Urashima Tarô riding a turtle, which already started in the early 18th centruy. It's often drawn in kusazôshi and nishikie. What is strange is Urashima riding the turtle standing on it. This may be because of making it look like “Bodhidharma crossing the Yangzi River on a reed”, and the turtle leading Urashima to Ryûgû is a minogame, which is regarded as sacred and appeared in the 17th century. The minogame was gradually turned into a normal turtle based on the idea of emphasizing the relationship with the sea as the meaning of minogame died out, but you can still find the turtle with a reedy tail in the present illustrated books.As you see, the style of Urashima legend described in the pictures had been changing through the years. The pictures change by themselves apart from the main story and it seems that they sometimes caused the story to change.
著者
林 晃平
出版者
札幌大学
雑誌
比較文化論叢 : 札幌大学文化学部紀要 (ISSN:13466844)
巻号頁・発行日
vol.11, pp.97-118, 2003-03-15