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Former Hasegawa Lab
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A lab that studies networking technologies with the aim of innovating the Internet.
AboutAbout the lab
Toward secure, high-speed networks.
The Advanced Network Architecture Lab aims to innovate the Internet and studies networking technologies that combine novelty with practicality.
The lab works on data center networks used to train large-scale AI models, cyberattack detection, and anonymous communication that protects privacy.
To implement these technologies inside the network itself, the lab also focuses on programming ultra-high-speed network hardware.
As of February 2026, this lab has become the Koizumi Lab.
Key terms
- Data center network
- The communication network that connects many computers to one another inside a data center. It is also used to train AI models.
- Anonymous communication
- A communication mechanism that makes it hard for third parties to know who is communicating with whom.
- Network hardware
- A general term for the devices that carry data within a communication network (network devices).
NewsLab news
A paper by a doctoral student has been accepted to IEEE Networking Letters
A paper from a joint Japan–US research project has been accepted to the international conference IEEE ICNP 2026
A paper by a graduate and a doctoral student has been accepted to IEEE ICNP 2026
A paper by a doctoral student has been accepted to IEEE INFOCOM 2026
A doctoral student received the CSS Outstanding Paper Award at the Computer Security Symposium 2025
ResearchResearch themes
The lab studies networking technologies that combine novelty with practicality, aiming to innovate the Internet. Its main topics are data center networks used to train large-scale AI models, technologies for running distributed machine learning securely and quickly, security technologies such as cyberattack detection and anonymous communication, and network hardware programming.
*Illustrative imageRethinking what an ideal network should look like
To fundamentally solve the technical and social problems of today's networks, the lab considers what form an ideal network should take. Its individual pages list in-network computing, the path-aware Internet, information-centric networking, and quantum communication.
*Illustrative imageProgramming ultra-high-speed network devices
As a foundational technology that supports networking research, the lab works on programming ultra-high-speed network devices.
*Illustrative imageAlgorithms that make networks faster
The lab develops algorithms that speed up networks.
*Illustrative imageNetworks that do not force connection
The lab aims to realize networks that let people connect with others without forcing them to be connected.
MembersFaculty
The members of the Advanced Network Architecture Lab consist of faculty, secretaries, collaborators, doctoral, master's, and undergraduate students, and alumni.As of 2026
- ProfessorYuki Koizumi
- Associate Professor (Concurrent)Daichi Kominami
- Assistant Professor (Concurrent)Tatsuya Otoshi
- Assistant ProfessorJunji Takemasa
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Network-connections” Parkis, Zanaq / CC BY-SA 3.0 (cropped)
- Rethinking what an ideal network should look like: “Internet map 1024” The Opte Project / CC BY 2.5 (cropped)
- Programming ultra-high-speed network devices: “Brocade ICX switches” Indhradhanush / CC BY-SA 4.0 (cropped)
- Algorithms that make networks faster: “Fiber optic network installation technician on pole” Domalchuk / CC BY 4.0 (cropped)
- Networks that do not force connection: “19-inch rackmount Ethernet switches and patch panels” Dsimic / CC BY-SA 4.0 (cropped)
- Related lab (Koizumi Lab): “Network-Engineering Ashlan Chidester 36” Cloud899 / CC BY-SA 4.0 (cropped)
- Related lab (Higo Lab): “Pile of light gray LEGO bricks at a LEGO store” Grendelkhan / CC BY-SA 4.0 (cropped)
- Related lab (Inomata Lab): “VPN & Internet Security on Your Computer for Online Privacy” mikemacmarketing / CC BY 2.0 (cropped)
- Related lab (Isobe Lab): “VIA Embedded booth security ( )” VIA Gallery from Hsintien, Taiwan / CC BY 2.0 (cropped)
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