Ranulfo Bezerra

Research

Connected Robotics

Connected Robotics studies robotic and sensor systems in which intelligence emerges from the communication, memory, reasoning, and coordinated action of distributed physical agents.

The problem

Devices are connected. Reasoning is not.

The question

How can connected physical agents think together?

How can connected physical agents collaboratively construct, update, and act upon shared models of the real world under partial observability, uncertainty, limited communication, and edge-computing constraints?

01/The architecture

Distributed agents contribute semantic evidence to a shared world model; reasoning over that model produces explainable collective action.

From connected devices to connected reasoning.

02/Research architecture

01

Collective Observability & Adaptive Sensing

A robot team and the sensors around it can only reason about what they can collectively observe. This pillar treats coverage, occlusion, and sensor placement as decisions the system makes and revises at run time — deploying sensors, moving to see, and choosing what is worth measuring next.

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Methods and topics

  • distributed sensing
  • active sensing
  • sensor placement
  • robot-deployed IoT
  • visibility & occlusion
  • multi-modal perception
  • coverage-aware behaviour

11 publications·2 projects

02

Shared Semantic World Models

Agents cannot reason together over raw sensor streams. They need a common, structured account of the world: what is present, how it relates, when it was seen, by whom, and how sure anyone is. This pillar builds semantic scene graphs and physical knowledge graphs that are dynamic, multimodal, and explicitly uncertain.

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Methods and topics

  • semantic scene graphs
  • physical knowledge graphs
  • dynamic world models
  • multimodal graph construction
  • spatio-temporal relations
  • uncertainty
  • provenance
  • semantic memory

9 publications·3 projects

03

Distributed Physical Reasoning

This is the centre of the program. Agents observe asynchronously, partially, and sometimes wrongly. Distributed physical reasoning asks how evidence — not raw data — propagates through a team, how beliefs are updated under uncertainty, how contradictions are detected rather than averaged away, and how consistency is maintained without a central authority.

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Methods and topics

  • semantic evidence sharing
  • belief updating
  • contradiction detection
  • uncertainty-aware inference
  • asynchronous observation
  • reasoning consistency
  • causal analysis

11 publications·2 projects

04

Explainable Collective Decision & Action

Shared understanding only matters if it changes what the system does. This pillar turns a shared world model into coordinated physical action — task allocation, macro-actions, multi-robot and robot-IoT coordination — and insists that the resulting decisions carry a trace a human can read and challenge.

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Methods and topics

  • interpretable task allocation
  • multi-robot coordination
  • macro-actions
  • reasoning-based planning
  • safe decision making
  • explanation traces
  • robot-IoT coordination

14 publications·2 projects

05

Edge Physical AI

The other four pillars are constrained by what a physical agent can actually compute, in time, on a power budget, in the field. This pillar develops compact models grounded in graph representations, distributes inference across the robot-IoT-edge continuum, and validates in simulation before hardware.

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Methods and topics

  • edge AI
  • compact reasoning models
  • small language models
  • graph-grounded reasoning
  • foundation models for robotics
  • distributed inference
  • real-time reasoning
  • simulation-to-real

13 publications·1 projects

03/Funded research

Institutional context

This research is conducted within the Yamazaki–Bezerra Laboratory (Tohoku Robotic Systems Laboratory) at Tohoku University, led by Prof. Kimitoshi Yamazaki, where complementary research spans robotic manipulation, mobile manipulation, household robotics, Connected Robotics, and Physical AI. Connected Robotics and Edge AI is one of the laboratory’s four research pillars, and the direction my own research develops. Part of the work is carried out with the Tough Cyberphysical AI Research Center.

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