Hirochika Asai

Hirochika Asai is a researcher at Preferred Networks, Inc. He received his Ph.D degree from Graduate School of Information Science and Technology, the University of Tokyo in 2013.

• Name: Hirochika Asai
• Born in 1985, Aichi, Japan
• Researcher at Preferred Networks, Inc.
• E-Mail: panda __at__ wide.ad.jp
  (Please replace "__at__" with "@")

Professional History

• April, 2017–current: Researcher at Preferred Networks, Inc.
• 2014–: Board member of WIDE Project
• April, 2013–March, 2017: Project Assistant Professor at the University of Tokyo

Degrees

• March 2013: received a Ph.D degree in Information Science and Technology from the University of Tokyo
  (also received an award from the Dean of Graduate School of Information Science and Technology・情報理工学系研究科研究科長賞受賞)
• March 2010: received a Master of Information Science and Technology degree from the University of Tokyo
• March 2008: received a B.E. (Bachelor of Engineer) degree from the University of Tokyo

Research Interests

• Internet topology and traffic measurement and analysis
• Operating system
• Distributed system and architecture

Publications

Journals

• Hirochika Asai, Yusuke Doi, and Ryokichi Onishi, "Toward Just-in-Time Data Communications over Shared Networks and Computational Resources on Massive Client Environment," Transportation Research Record Journal of the Transportation Research Board, April, 2021
• Hirochika Asai, Kensuke Fukuda, Patrice Abry, Pierre Borgnat, and Hiroshi Esaki, "Network Application Profiling with Traffic Causality Graphs", International Journal of Network Management, Vol. 24, no. 4, pp. 289–303, 2014 [pdf]
• 浅井大史, 福田健介, 江崎浩, “DNS探索グラフによるIPv4/IPv6トランスポートを考慮したDNS委譲構造の分析,” 日本ソフトウェア科学会ネットワーク特集号, Vol. 30, No. 2, pp. 135–146 (2013)
• 呉和賢, 浅井大史, “東日本大震災を受けてのクラウド構築と運用事例”（解説記事）, 日本セキュリティ・マネジメント学会5月号, Vol. 26, p. 14 (2012)
• 浅井大史, 江崎浩, “AS規模定量化によるAS間接続関係の推定,” 日本ソフトウェア科学会ネットワーク特集号, Vol. 29, No. 2, pp. 95–108 (2012)

International conferences w/ review

• Hirochika Asai, "Palmtrie: A Ternary Key Matching Algorithm for IP Packet Filtering Rules," ACM CoNEXT 2020, Virtual Barcelona, Spain (online), pp.323–335, December 1–4, 2020 [PDF]
• Hirochika Asai, "Deep Pipelining: Efficient Pipelining of Network Function Chains with Coroutines," IEEE NetSoft 2019, Paris, France, June 24–28, 2019, pp.324–332, 2019
• Hirochika Asai, "Efficient Multicore Scaling in Software Packet Forwarding Engines," IEEE NetSoft 2018, Montreal, Canada, June 25–30, 2018, pp. 283–287, 2018
• Keiichi Shima, Daisuke Miyamoto, Hiroshi Abe, Tomohiro Ishihara, Kazuya Okada, Yuji Sekiya, Hirochika Asai, and Yusuke Doi, "Classification of URL bitstreams using Bag of Bytes," First International Workshop on Network Intelligence (NI 2018), Paris, France, February 19, 2018
• Motomu Utsumi, Hirochika Asai, and Hiroshi Esaki, "Spatio-Temporal Modeling of BGP Routing Table Evolution," The 12th International Conference on Future Internet Technologies, Fukuoka, Japan, June 15—16, 2017
• Kensuke Fukuda, Hirochika Asai, and Ken-ichi Nagami, "Tracking the Evolution and Diversity in Network Usage of Smartphones," ACM Internet Measurement Conference 2015, pp. 253–266, 2015
• Hirochika Asai, Yasuhiro Ohara, "Poptrie: A Compressed Trie with Population Count for Fast and Scalable Software IP Routing Table Lookup," ACM SIGCOMM 2015, pp. 57–70, 2015 [pdf]
• Hirochika Asai, "Where are the Bottlenecks in Software Packet Processing and Forwarding? Towards High-Performance Network Operating Systems," The Ninth International Conference on Future Internet Technologies, Tokyo, Japan, June. 19—20, 2014 [link]
• Hirochika Asai, "P2V Migration with Post-copy Hot Cloning for Service Downtime Reduction," Third International Conference on Cloud and Green Computing (CGC), Karlsruhe, Germany, Sep. 30—Oct. 2, 2013 [link]
• Hirochika Asai, Kensuke Fukuda, and Hiroshi Esaki, "Social Benchmarking of QoS & QoE in Cellular Data Networks," IEEE International Communications Quality and Reliability (CQR) Workshop, Marco Island, FL, USA, May. 14–16, 2013 (Best Paper Award)
• Hirochika Asai, Kensuke Fukuda, and Hiroshi Esaki, "Traffic Causality Graphs: Profiling Network Applications through Temporal and Spatial Causality of Flows," 23rd International Teletraffic Congress, San Francisco, USA, Sep. 6–8, 2011
• Hirochika Asai, Kensuke Fukuda, and Hiroshi Esaki, "Towards Characterization of Wireless Traffic in Coexisting 802.11a/g and 802.11n Network," ACM CoNEXT 2010 Student Workshop, Philadelphia, USA, Nov. 30, 2010 [pdf]
• Hirochika Asai and Hiroshi Esaki, "Towards Interdomain Transit Traffic Reduction in Peer-assisted Content Delivery Networks," 14th International Telecommunications Network Strategy and Planning Symposium, pp. 95–100, Warsaw, Poland, Sep., 2010
• Hirochika Asai and Hiroshi Esaki, "Estimating AS Relationships for Application-Layer Traffic Optimization," Springer's Lecture Notes in Computer Science Vol. 6236, 3rd Workshop on Economic Traffic Management, pp. 51–63, Amsterdam, The Netherlands, Sep., 2010 (Acceptance rate: ~29%) [link]
• Hirochika Asai and Hiroshi Esaki, "AURORA: Autonomous System Relationships-aware Overlay Routing Architecture in P2P CDNs," Asia Future Internet summer school, Jeju, Korea, Aug., 2009 [pdf]

RFCs

• [RFC 7666] Management Information Base for Virtual Machines Controlled by a Hypervisor, Internet Engineering Task Force (IETF), Standard Track

Domestic conferences w/ review

• 林東權, 浅井大史, 木下僚, 正原竜太, 江崎浩, “VXLANを用いたクラウドのための無線インフラストラクチャーの構築,” 日本ソフトウェア科学会インターネットテクノロジワークショップ（WIT）2012, 北海道, 2012年6月
• 浅井大史, 福田健介, 江崎浩, "DNS探索グラフの可視化と解析," WIT2011, 北海道, 2011年6月
• 石橋尚武, 浅井大史, 江崎浩, "コンテンツ配信の効率化に向けた サービスプロバイダの接続トポロジーの解析," WIT2011, 北海道, 2011年6月
• Hirochika ASAI, Hiroshi ESAKI, "A Methodology for Magnitude-based Inter-AS Distance Estimation," WIT2009, Hokkaido, June, 2009 [pdf]
• 浅井大史, 江崎浩, "マルチドメインP2P型CDNにおける経路制御アーキテクチャの提案と評価," インターネットコンファレンス2008, pp. 78–84, 沖縄, 2008年10月 [pdf]

Domestic conferences w/o review

• 福田健介, 浅井大史, 永見健一, “スマートフォンにおけるスループット計測に関する一考察”, 電子情報通信学会 CQ研究会, 信学技報, Vol. 113, No. 471, CQ2013-87, pp. 1–6, 2014年3月
• 石橋尚武, 浅井大史, 江崎浩, “我が国のコンテンツ配信の効率化に向けたサービスプロバイダの接続トポロジーの解析と解決手法の検討”, 電子情報通信学会 総合大会, B-16-10, 東京, 2011年3月
• 浅井大史, 木下僚, 林東權, 正原竜太, 李聖年, 小坂良太, 呉和賢, 江崎浩, “VXLANを用いた無線クラウドサーバーの実装”, 電子情報通信学会 総合大会, B-16-5, 岡山, 2012年3月
• 浅井大史, 江崎浩, "固有値解析を用いたAS間接続関係の数値評価手法の提案," 電子情報通信学会技術研究報告, Vol.108 No.460, pp. 271–275 (IA2008-113), 熊本, 2009年3月
  （インターネットアーキテクチャ研究会 学生研究奨励賞受賞）
• 浅井大史, 江崎浩, "マルチドメインP2P型CDNにおける配信経路制御の提案と評価," 電子情報通信学会 総合大会, B-16-13, 福岡, 2008年3月

Ph.D thesis

• Hirochika Asai, "Analysis and Management of the Internet based on Data Flow Profiling," Ph.D thesis, March, 2013

Technical paper at the University of Tokyo (not open to public)

• Hirochika Asai, Hiroshi Esaki, "Characterizing AS Relationships by Recursive Analysis of AS Adjacency Matrices," Creative Informatics, Graduate School of Information Science and Technology, the University of Tokyo, May 28, 2010 [pdf]

Certificate

• ISS Square 情報セキュリティ・スペシャリスト・サーティフィケート（ISSCertificate）

Public Talks

• 2015-04-09: “Networking Operating System from Scratch towards High-Performance COTS Network Facilities” at IIJ-II seminar [pdf]

Joint Research

• 2014–2015: Practical Research on Fast Routing Lookup Algorithm with NTT Communications
• 2014: Operating System Architecture for Fast Packet I/O with Alaxala Networks

Lectures at the University of Tokyo, Japan

2015

• ソフトウェア・クラウド開発プロジェクト実践I

2014

• ソフトウェア・クラウド開発プロジェクト実践III

2013

• ソフトウェア・クラウド開発プロジェクト実践I

Open Source Software

My github repository