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Miyoshi Lab
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A lab that uses probability to model the uncertain phenomena of everyday life.
AboutAbout the lab
Analyzing randomness and uncertainty using probability
The Miyoshi Lab models and analyzes uncertain phenomena in everyday life using probability.
From the models it builds, the lab draws out mathematical structures and essential properties, and examines what outcomes to expect.
It is particularly interested in stochastic phenomena that arise in information and communications and in computer science.
Its subjects include the placement of mobile phone base stations and queues, which work on the same principle as a line at a store checkout.
Key terms
- stochastic model
- A mathematical expression, using probability, of a phenomenon that cannot be predicted exactly even a little way ahead
- spatial point process
- A probabilistic mathematical model describing how points are randomly scattered over a plane or a space
- queue
- A line of people waiting their turn, such as in front of an ATM or a checkout; the mathematical study of such lines examines congestion and waiting time
NewsLab news
A student received the Research Encouragement Award from the Queueing Theory Research Group of the Operations Research Society of Japan
A paper on wireless networks received the Queueing Theory Research Group's FY2024 Paper Award
A paper by Prof. Miyoshi and colleagues was published in IEEE Transactions on Wireless Communications
ResearchResearch themes
The lab models phenomena involving uncertain fluctuations using probability, draws out the mathematical structures and essential properties within them, and examines the outcomes to be expected. It is particularly interested in stochastic phenomena that arise in information and communications and in computer science.
*Illustrative imageSpatial stochastic models of wireless networks
In wireless communication such as mobile phones, the positional relationship between base stations and terminals greatly affects performance. Because interference signals arriving from other nodes also matter, the lab represents node placement with spatial point processes and evaluates performance based on those stochastic models.
*Illustrative imageMeasuring Internet communication quality
Even when a page takes a long time to display, it is not possible to look directly inside the Internet to find the cause. The lab studies methods that, for example by sending probe packets, model the flow of packets traveling through the network probabilistically and infer its internal state indirectly.
*Illustrative imageAnalyzing cache miss rates
In a cache, which keeps frequently used files in a place where they are easy to retrieve, the update rule that decides which files to keep is the key issue. The lab models the files that will be needed probabilistically and investigates the probability that a requested file is not in the cache.
*Illustrative imageModeling and analyzing queues
The same mechanism as a line at an ATM or a checkout also arises inside communication systems and production systems. Recently it has been used as a stochastic model of call centers, to evaluate how easy it is to get through and how long callers wait after being connected.
MembersFaculty
The members of the Miyoshi Lab consist of faculty and master's students.As of 2026
- ProfessorMiyoshi NaotoPublications ↗
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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: “Voronoi AAAAA14” SmallJarsWithGreenLabels / CC0 (cropped)
- Spatial stochastic models of wireless networks: “base stations in Réunion Island” Parchaco / CC0 (cropped)
- Measuring Internet communication quality: “Network cables plugged to router 20170903” Santeri Viinamäki / CC BY-SA 4.0 (cropped)
- Analyzing cache miss rates: “CPU Pentium Pro” Klaus Eifert / CC BY-SA 3.0 (cropped)
- Modeling and analyzing queues: “People waiting in line at Stena Line ferry terminal, Frederikshavn” W.carter / CC0 (cropped)
- Related lab (中野張研究室): “Brownian surface” Prokofiev / CC BY-SA 3.0 (cropped)
- Related lab (土岡俊介研究室): “Gosset 1 22 polytope” Tom Ruen / Public domain (cropped)
- Related lab (高邉賢史研究室): “Ising-tartan” Linas / CC BY-SA 3.0 (cropped)
- Related lab (遠藤敏夫研究室): “Amalka Supercomputing facility” Davidpodhola / CC BY-SA 3.0 (cropped)
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