著者

廣木 源 高村 陽太 松下 瑛介 菅原 聡 中川 茂樹

雑誌

2021年第68回応用物理学会春季学術講演会

巻号頁・発行日

2021-01-26

著者

藤田 英明 中川 茂樹 広川 二郎

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.140, no.11, pp.720-723, 2020-11-01 (Released:2020-11-01)

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1.はじめに藤田英明:中川先生,広川先生,今日はお集まりいただきありがとうございます。今日は「電気電子工学科は何を教え・学ぶところなのか」というテーマで,Zoomを使ったオンラインミーティングで意見交換などさせていただきたいと思っています。

著者

笠原 敬司 酒井 慎一 森田 裕一 平田 直 鶴岡 弘 中川 茂樹 楠城 一嘉 小原 一成

出版者

東京大学

雑誌

東京大學地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.84, no.2, pp.71-88, 2010-01-28

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To better assess the seismic hazards produced by a magnitude 7 or greater (M 7+) earthquake in the Tokyo metropolitan area, we have launched the Special Project for Earthquake Disaster Mitigation in Tokyo Metropolitan area (2007−2011). This requires establishing a highly dense seismic-array observation network in and around Tokyo to monitor ongoing micro-earthquakes with relatively high precision even if noise levels are generally high. We have started developing the Metropolitan Seismic Observation network (MeSO-net). Deployment of MeSO-net seismic stations is currently underway. The number of observatories at project termination will be 400 with a 2−5km interval in space. In this paper, we summarize how we solved technically difficult and practical problems involved in MeSO-net construction. We start with a review of related work to better understand the technical difficulties involved in deploying stations in metropolitan areas such as Tokyo. Next, we explain our approach to verifying a meaningful design of an observatory and its deployment at local sites. We further describe our decision-making process in practice for implementing station deployment. We hope that establishing the MeSO-net will support a new assessment of the seismic hazards produced by M 7+ earthquakes in the Tokyo metropolitan area.

著者

奥田 光伸 宮本 泰敬 川那 真弓 宮下 英一 斎藤 信雄 林 直人 中川 茂樹

出版者

一般社団法人 映像情報メディア学会

雑誌

映像情報メディア学会年次大会講演予稿集 (ISSN:13431846)

巻号頁・発行日

vol.2015, pp.31A-1, 2015

著者

中川 茂樹 鶴岡 弘 川北 優子 酒井 慎一 平田 直

出版者

東京大学地震研究所

雑誌

地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.84, no.2, pp.107-114, 2009

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We launched the Special Project for Earthquake Disaster Mitigation in the Metropolitan Tokyo area to obtain high-resolution images of three-dimensional seismic wave velocity and attenuation structures. The core item of this project is a dense seismic array called MeSO-net for making observations in the metropolitan area. MeSO-net consists of 400 seismic stations, from which data are continuously collected at the Data Center at ERI. At the Sub-Center at NIED, data are backed up and integrated with Hi-net data. Seismic data with a sampling rate of 200 Hz are transmitted to the Data Center using ACT protocol. Data from all stations are received at the Data Center at ERI. After checking the quality (including lost packets) of data received, data are automatically processed and archived using the WIN system. This observational network and the Data Center are equipped with several new functions for reliable data transmission and ease of maintenance.

著者

森田 裕一 酒井 慎一 中川 茂樹 笠原 敬司 平田 直 鏡 弘道 加藤 拓弥 佐藤 峰司

出版者

東京大学地震研究所

雑誌

地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.84, no.2, pp.89-105, 2009

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The Autonomous Cooperative data Transfer Protocol (ACT protocol) is one of the data transfer protocols based on UDP/IP developed for the Metropolitan Seismic Observation network (MeSO-net). It has a robust re-send function to prevent data from being lost in the Internet route. Moreover, it also has a function to adjust the data transmission rate considering the quality of the Internet route and the load on the data-receiving system. If the Internet route is too busy to send all data, the transmission rate from the observation station is decreased automatically to ease the Internet traffic jam, and data that cannot be sent because of the limitation on the transmission rate are stored at each station. After conditions recover, the stored data are sent automatically at an increasing transmission rate and gradually catch up with real-time data. The transmission rate is decided by data transmission equipment at the station using pre-loaded algorithms, not at the data center. Therefore, the load at data center equipment is not so high even if the equipment receives data from hundreds of stations. We describe an overview of the ACT protocol, flow charts, and data format used in the protocol. We also demonstrate that the ACT protocol is very powerful for the vast size of the seismograph network composed of several hundred stations. The ACT protocol is generally applicable and can be used for data transmission systems in other scientific fields.

著者

奥田 光伸 宮本 泰敬 川那 真弓 宮下 英一 斎藤 信雄 林 直人 中川 茂樹

出版者

一般社団法人 映像情報メディア学会

雑誌

映像情報メディア学会年次大会講演予稿集 映像情報メディア学会2015年年次大会予稿集 (ISSN:13431846)

巻号頁・発行日

pp.31A-1, 2015 (Released:2018-05-18)

参考文献数

6

著者

森田 裕一 酒井 慎一 中川 茂樹 笠原 敬司 平田 直 鏡 弘道 加藤 拓弥 佐藤 峰司

出版者

東京大学地震研究所

雑誌

地震研究所彙報 (ISSN:00408992)

巻号頁・発行日

vol.84, no.2, pp.89-105, 2009

---

The Autonomous Cooperative data Transfer Protocol (ACT protocol) is one of the data transfer protocols based on UDP/IP developed for the Metropolitan Seismic Observation network (MeSO-net). It has a robust re-send function to prevent data from being lost in the Internet route. Moreover, it also has a function to adjust the data transmission rate considering the quality of the Internet route and the load on the data-receiving system. If the Internet route is too busy to send all data, the transmission rate from the observation station is decreased automatically to ease the Internet traffic jam, and data that cannot be sent because of the limitation on the transmission rate are stored at each station. After conditions recover, the stored data are sent automatically at an increasing transmission rate and gradually catch up with real-time data. The transmission rate is decided by data transmission equipment at the station using pre-loaded algorithms, not at the data center. Therefore, the load at data center equipment is not so high even if the equipment receives data from hundreds of stations. We describe an overview of the ACT protocol, flow charts, and data format used in the protocol. We also demonstrate that the ACT protocol is very powerful for the vast size of the seismograph network composed of several hundred stations. The ACT protocol is generally applicable and can be used for data transmission systems in other scientific fields.

著者

中川 茂樹 鶴岡 弘 川北 優子 酒井 慎一 平田 直

出版者

東京大学地震研究所

雑誌

地震研究所彙報 (ISSN:00408992)

巻号頁・発行日

vol.84, no.2, pp.107-114, 2009

---

We launched the Special Project for Earthquake Disaster Mitigation in the Metropolitan Tokyo area to obtain high-resolution images of three-dimensional seismic wave velocity and attenuation structures. The core item of this project is a dense seismic array called MeSO-net for making observations in the metropolitan area. MeSO-net consists of 400 seismic stations, from which data are continuously collected at the Data Center at ERI. At the Sub-Center at NIED, data are backed up and integrated with Hi-net data. Seismic data with a sampling rate of 200 Hz are transmitted to the Data Center using ACT protocol. Data from all stations are received at the Data Center at ERI. After checking the quality (including lost packets) of data received, data are automatically processed and archived using the WIN system. This observational network and the Data Center are equipped with several new functions for reliable data transmission and ease of maintenance.