著者

Yasunobu TOYOTA Wataru MISHIMA Koichiro KANAYA Osamu NAKAMURA

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Transactions on Information and Systems (ISSN:09168532)

巻号頁・発行日

vol.E106.D, no.5, pp.927-939, 2023-05-01 (Released:2023-05-01)

参考文献数

46

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QoS of applications is essential for content providers, and it is required to improve the end-to-end communication quality from a content provider to users. Generally, a content provider's data center network is connected to multiple ASes and has multiple egress paths to reach the content user's network. However, on the Internet, the communication quality of network paths outside of the provider's administrative domain is a black box, so multiple egress paths cannot be quantitatively compared. In addition, it is impossible to determine a unique egress path within a network domain because the parameters that affect the QoS of the content are different for each network. We propose a “Performance Aware Egress Path Discovery” method to improve QoS for content providers. The proposed method uses two techniques: Egress Peer Engineering with Segment Routing over IPv6 and Passive End-to-End Measurement. The method is superior in that it allows various metrics depending on the type of content and can be used for measurements without affecting existing systems. To evaluate our method, we deployed the Performance Aware Egress Path Discovery System in an existing content provider network and conducted experiments to provide production services. Our findings from the experiment show that, in this network, 15.9% of users can expect a 30Mbps throughput improvement, and 13.7% of users can expect a 10ms RTT improvement.

著者

轟 慎一 中村 攻 木下 勇 Shinichi TODOROKI Osamu NAKAMURA Isami KINOSHITA 滋賀県立大学 千葉大学 千葉大学 The Univ.of Shiga Pref. Chiba Univ. Chiba Univ.

出版者

農村計画学会

雑誌

農村計画論文集 = Transactions of rural planning (ISSN:09129731)

巻号頁・発行日

vol.3, pp.157-162, 2001-12-07

参考文献数

5

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本研究は平地部集落の宅地空間における作業所等の改変とそれに伴う連関変化の視点から、宅地内の建築物・OS・宅地境界空間や宅地外空間・生活・生業等の要素相互の連関を把握した。宅地境界空間との連関では、作業所の隣接等に伴う囲いの改変や農機具導入等に伴う出入口・囲い等の連関変化が捉えられた。OSへの連関では、砂利化や日当たり悪化による土更地・菜園畑の改変や意匠庭・隣接農地等への影響が把握された。建築物との連関では改変行為を契機とする建築物・OS・宅地境界空間への連関変化が捉えられた。宅地外空間との連関では、菜園畑の消失等に連関した隣接する苗代等の宅地化と、作業所・農機具庫・ハウス・囲い等の設置が把握された。To clear relationship between elements of rural settlement, we analyzed the structure on the relative changes with the changes of the workshop on the buildings, the open spaces and the border spaces in housing lot, the spaces out of housing lot, life style and agricultural management. The main contents of this paper are as follows. 1) On border space of housing lot, the relations to adjoining buildings change the hedges and the walls. And the entrance and the fences are changed with the relations on the change of the path of flow. 2) On open space in housing lot, the relative changes of the clay yard and the vegetable garden influence the changes of the planting garden and the adjoining farm. 3) With the constructions of the workshop, there are the relative changes to the buildings, the open spaces and the border spaces in housing lot. 4) On the adjoining farm, there are the constructions of the workshop, the shed for agricultural machines, the vinyl house and the fence.