RESEARCH
At PlusLab, we have worked on research that connects information from devices, people and sites through technologies such as network communication, IoT and sensing, and distributed processing. Based on our published papers, we introduce the purpose and main efforts of each theme.
Themes with publications in the last 5 years
10 45 last 5 years
total 95 Secure Overlay Network (CYPHONIC) Research on an overlay network that enables encrypted communication between devices across differences in network environments and device movement. We study how to build QUIC into CYPHONIC to maintain connectivity in environments that mix IPv4 and IPv6 and include NAT and firewalls. Our work has covered route optimization to reduce the load and delay caused by relaying traffic, performance improvement under packet loss, and the design and evaluation of mechanisms for connecting existing IoT devices. since 2019 latest 2026 16 last 5 years
total 21 RFID-based Positioning and Sensing Research on estimating the position and direction of movement of items from radio information obtained from RFID tags. We study positioning and tracking methods that combine received signal strength, phase and antenna placement while accounting for variation caused by the surrounding environment. Alongside a prototype analysis platform that visualizes read states in the cloud, we have also studied low-power communication that sends information by reflecting nearby Wi-Fi signals. since 2017 latest 2026 9 last 5 years
total 12 NEW Distributed Dataflow and Edge Computing Research on a platform that processes the data produced by IoT devices by sharing the work among multiple on-site devices, rather than only collecting it in the cloud. With InfoFlow, we study a mechanism for designing a service's processing steps on screen and dividing and placing them across devices. Through software recomposition and container management, we aim to build flexible edge services whose functions can be changed easily without replacing devices. since 2021 latest 2025 6 last 5 years
total 22 BLE-based IoT Sensor Systems Research on an IoT system, built on Bluetooth Low Energy (BLE), in which a single sensor device can be used by multiple applications and services. We study sharing devices by combining data acquisition over a connection with a broadcast method that receives information without connecting. We design and evaluate a control mechanism that runs multiple processes in parallel, aiming to make good use of limited computing resources and reduce the development of dedicated devices for each service. since 2015 latest 2025 5 last 5 years
total 120 NTMobile Research on technology for continuing communication even when a device moves and its point of attachment or IP address changes. NTMobile uses virtual addresses and tunnel communication to cope with the connectivity limits of mixed IPv4/IPv6 environments and NAT. We have studied an Android implementation, switching between Wi-Fi and cellular networks, route selection for each communication flow, and applications such as SIP, and have also proposed an extension to encrypted communication using QUIC. since 2011 latest 2025 4 last 5 years
total 8 Activity Recognition and Feedback Research on understanding where people are and who they are acting with by linking beacons and smartphones. We study a mechanism that estimates connections between people from the time they spend in the same place and the overlap of their activities. We also work on technology that uses Wi-Fi signals to estimate which room a person is in inside a building. Through such location and activity information, we aim to visualize the activities of people and groups and to understand interaction and how spaces are used. since 2020 latest 2026 4 last 5 years
total 6 Decision Support for Emergency Medical Transport Research on using ambulance operation data to support decisions about destination hospitals and routes with data. From existing AVM data, which records a vehicle's position, state and traveling speed, we study a system that estimates candidate destination hospitals, visualizes congested locations and shows transport records on a map. Basic operation was confirmed with a prototype system using data from Nagoya City, and we aim to build an information platform for understanding trends in emergency transport. since 2019 latest 2026 3 last 5 years
total 12 Vehicular Communication and Trajectory Prediction Research on tracking surrounding vehicles and predicting their future movements from position and speed information exchanged between vehicles. Taking into account differences in communication devices and information that is hard to deliver, we study a method that combines periodic beacon transmission, relaying when needed and trajectory prediction. We also handle cooperative prediction that accounts for GPS errors, aiming to grasp the state of nearby vehicles under limited communication conditions. since 2015 latest 2024 2 last 5 years
total 12 Factory Automation: Control and Anomaly Detection Research on capturing the state of equipment and wiring in manufacturing sites, leading to anomaly detection, maintenance and automated inspection. We have studied anomaly detection that models interactions between devices, such as vibration and heat, and image-based inspection of wiring and parts using deep learning. Using real images and 3D CG, we have tried to inspect for wrong connections, disconnected terminals and broken wires, and we are exploring methods that can also handle small-lot production and complex equipment. since 2013 latest 2023 1 last 5 years
total 101 Ad Hoc, Sensor and Wireless Networks Research on wireless networks in which terminals and sensors cooperate to deliver information and operate autonomously according to the application. We have studied relay route selection, cooperative transmission by multiple terminals, and grouping so that only the necessary sensors are combined. Beyond collecting information at a central management device, we prototype and evaluate mechanisms in which nearby devices exchange and process data, aiming for both communication efficiency and flexible operation. since 2005 latest 2023
total 95 Secure Overlay Network (CYPHONIC) Research on an overlay network that enables encrypted communication between devices across differences in network environments and device movement. We study how to build QUIC into CYPHONIC to maintain connectivity in environments that mix IPv4 and IPv6 and include NAT and firewalls. Our work has covered route optimization to reduce the load and delay caused by relaying traffic, performance improvement under packet loss, and the design and evaluation of mechanisms for connecting existing IoT devices. since 2019 latest 2026 16 last 5 years
total 21 RFID-based Positioning and Sensing Research on estimating the position and direction of movement of items from radio information obtained from RFID tags. We study positioning and tracking methods that combine received signal strength, phase and antenna placement while accounting for variation caused by the surrounding environment. Alongside a prototype analysis platform that visualizes read states in the cloud, we have also studied low-power communication that sends information by reflecting nearby Wi-Fi signals. since 2017 latest 2026 9 last 5 years
total 12 NEW Distributed Dataflow and Edge Computing Research on a platform that processes the data produced by IoT devices by sharing the work among multiple on-site devices, rather than only collecting it in the cloud. With InfoFlow, we study a mechanism for designing a service's processing steps on screen and dividing and placing them across devices. Through software recomposition and container management, we aim to build flexible edge services whose functions can be changed easily without replacing devices. since 2021 latest 2025 6 last 5 years
total 22 BLE-based IoT Sensor Systems Research on an IoT system, built on Bluetooth Low Energy (BLE), in which a single sensor device can be used by multiple applications and services. We study sharing devices by combining data acquisition over a connection with a broadcast method that receives information without connecting. We design and evaluate a control mechanism that runs multiple processes in parallel, aiming to make good use of limited computing resources and reduce the development of dedicated devices for each service. since 2015 latest 2025 5 last 5 years
total 120 NTMobile Research on technology for continuing communication even when a device moves and its point of attachment or IP address changes. NTMobile uses virtual addresses and tunnel communication to cope with the connectivity limits of mixed IPv4/IPv6 environments and NAT. We have studied an Android implementation, switching between Wi-Fi and cellular networks, route selection for each communication flow, and applications such as SIP, and have also proposed an extension to encrypted communication using QUIC. since 2011 latest 2025 4 last 5 years
total 8 Activity Recognition and Feedback Research on understanding where people are and who they are acting with by linking beacons and smartphones. We study a mechanism that estimates connections between people from the time they spend in the same place and the overlap of their activities. We also work on technology that uses Wi-Fi signals to estimate which room a person is in inside a building. Through such location and activity information, we aim to visualize the activities of people and groups and to understand interaction and how spaces are used. since 2020 latest 2026 4 last 5 years
total 6 Decision Support for Emergency Medical Transport Research on using ambulance operation data to support decisions about destination hospitals and routes with data. From existing AVM data, which records a vehicle's position, state and traveling speed, we study a system that estimates candidate destination hospitals, visualizes congested locations and shows transport records on a map. Basic operation was confirmed with a prototype system using data from Nagoya City, and we aim to build an information platform for understanding trends in emergency transport. since 2019 latest 2026 3 last 5 years
total 12 Vehicular Communication and Trajectory Prediction Research on tracking surrounding vehicles and predicting their future movements from position and speed information exchanged between vehicles. Taking into account differences in communication devices and information that is hard to deliver, we study a method that combines periodic beacon transmission, relaying when needed and trajectory prediction. We also handle cooperative prediction that accounts for GPS errors, aiming to grasp the state of nearby vehicles under limited communication conditions. since 2015 latest 2024 2 last 5 years
total 12 Factory Automation: Control and Anomaly Detection Research on capturing the state of equipment and wiring in manufacturing sites, leading to anomaly detection, maintenance and automated inspection. We have studied anomaly detection that models interactions between devices, such as vibration and heat, and image-based inspection of wiring and parts using deep learning. Using real images and 3D CG, we have tried to inspect for wrong connections, disconnected terminals and broken wires, and we are exploring methods that can also handle small-lot production and complex equipment. since 2013 latest 2023 1 last 5 years
total 101 Ad Hoc, Sensor and Wireless Networks Research on wireless networks in which terminals and sensors cooperate to deliver information and operate autonomously according to the application. We have studied relay route selection, cooperative transmission by multiple terminals, and grouping so that only the necessary sensors are combined. Beyond collecting information at a central management device, we prototype and evaluate mechanisms in which nearby devices exchange and process data, aiming for both communication efficiency and flexible operation. since 2005 latest 2023
Other themes (no publication in the last 5 years)
7 0 last 5 years
total 129 OFDM and CDMA Mobile Communication Research on fundamental technologies for efficient wireless communication amid movement and changing radio conditions. We have proposed and evaluated OFDM transmission methods that reduce signal power peaks, and methods in which multiple terminals cooperatively send the same signal. For CDMA, we address characteristics such as downlink communication in multi-hop configurations, and through simulations and experiments with software-defined radio we study improvements in communication quality and transmission efficiency. since 2000 latest 2014 0 last 5 years
total 28 Indoor Positioning, Pedestrian Trajectories and Health Sensing Research on capturing the positions and movements of people inside buildings using smartphones and everyday sensors. We have studied estimating walking direction and trajectories from acceleration and angular velocity, and integrating multiple trajectories to grasp the spatial structure of indoor spaces. We also work on technology that applies position and activity sensing to understanding living environments and watching over people, such as detecting falls from temperature distributions measured by radiation temperature sensors. since 2013 latest 2020 0 last 5 years
total 23 Participatory Sensing and Open Data Research on services that collect local information and put it to use in everyday life in an easy-to-use form. We have studied participatory sensing, in which smartphones and BLE devices collect data without user operation, and mechanisms for organizing and complementing open-data items that differ from one municipality to another. We have also prototyped child-rearing support and local recommendation services, and we evaluate methods that connect data collection to information provision. since 2014 latest 2016 0 last 5 years
total 15 Security and Authentication Research on authentication and communication methods for verifying users and communication partners and exchanging information safely. We have studied authentication that combines a password with a random number held on the device, a method for distinguishing the genuine user from an impostor from acceleration during driving, and a method for removing illegitimate communication packets early. We also handle the generation and distribution of encryption keys shared within a group, and evaluate the balance among security, usability and processing load. since 2015 latest 2019 0 last 5 years
total 12 Drones and Field IoT Research on communication and sensing for devices used outdoors, such as drones and agricultural fields. We have proposed a remote control method that lets sensor information and control information keep being exchanged even when the network a drone connects to changes. In agriculture, we prototyped an automatic irrigation system using a Thread network and are studying the construction of IoT that connects on-site data acquisition with device control. since 2009 latest 2019 0 last 5 years
total 8 Communication Technologies for ITS Research on communication technology that delivers information related to driving and safety between roads and vehicles and between vehicles. Assuming situations where communication becomes unstable because of blockage by large vehicles or vehicle movement, we have studied delivering information to surrounding vehicles and relaying through appropriate vehicles. To achieve both short delay in spreading information and delivery efficiency as the number of vehicles grows, we design communication methods and evaluate them by simulation. since 2006 latest 2012 0 last 5 years
total 1 Healthcare Research on using a card-type device people routinely carry to record daily activity. We have studied a mechanism that builds a low-power microcontroller and sensors into an RFID card and records the amount of exercise while it is carried like an employee ID card. Related prototype research also covers data linkage with RFID reading facilities, aiming to capture activity levels without the burden of carrying special health-management devices. since 2017 latest 2017
total 129 OFDM and CDMA Mobile Communication Research on fundamental technologies for efficient wireless communication amid movement and changing radio conditions. We have proposed and evaluated OFDM transmission methods that reduce signal power peaks, and methods in which multiple terminals cooperatively send the same signal. For CDMA, we address characteristics such as downlink communication in multi-hop configurations, and through simulations and experiments with software-defined radio we study improvements in communication quality and transmission efficiency. since 2000 latest 2014 0 last 5 years
total 28 Indoor Positioning, Pedestrian Trajectories and Health Sensing Research on capturing the positions and movements of people inside buildings using smartphones and everyday sensors. We have studied estimating walking direction and trajectories from acceleration and angular velocity, and integrating multiple trajectories to grasp the spatial structure of indoor spaces. We also work on technology that applies position and activity sensing to understanding living environments and watching over people, such as detecting falls from temperature distributions measured by radiation temperature sensors. since 2013 latest 2020 0 last 5 years
total 23 Participatory Sensing and Open Data Research on services that collect local information and put it to use in everyday life in an easy-to-use form. We have studied participatory sensing, in which smartphones and BLE devices collect data without user operation, and mechanisms for organizing and complementing open-data items that differ from one municipality to another. We have also prototyped child-rearing support and local recommendation services, and we evaluate methods that connect data collection to information provision. since 2014 latest 2016 0 last 5 years
total 15 Security and Authentication Research on authentication and communication methods for verifying users and communication partners and exchanging information safely. We have studied authentication that combines a password with a random number held on the device, a method for distinguishing the genuine user from an impostor from acceleration during driving, and a method for removing illegitimate communication packets early. We also handle the generation and distribution of encryption keys shared within a group, and evaluate the balance among security, usability and processing load. since 2015 latest 2019 0 last 5 years
total 12 Drones and Field IoT Research on communication and sensing for devices used outdoors, such as drones and agricultural fields. We have proposed a remote control method that lets sensor information and control information keep being exchanged even when the network a drone connects to changes. In agriculture, we prototyped an automatic irrigation system using a Thread network and are studying the construction of IoT that connects on-site data acquisition with device control. since 2009 latest 2019 0 last 5 years
total 8 Communication Technologies for ITS Research on communication technology that delivers information related to driving and safety between roads and vehicles and between vehicles. Assuming situations where communication becomes unstable because of blockage by large vehicles or vehicle movement, we have studied delivering information to surrounding vehicles and relaying through appropriate vehicles. To achieve both short delay in spreading information and delivery efficiency as the number of vehicles grows, we design communication methods and evaluate them by simulation. since 2006 latest 2012 0 last 5 years
total 1 Healthcare Research on using a card-type device people routinely carry to record daily activity. We have studied a mechanism that builds a low-power microcontroller and sensors into an RFID card and records the amount of exercise while it is carried like an employee ID card. Related prototype research also covers data linkage with RFID reading facilities, aiming to capture activity levels without the burden of carrying special health-management devices. since 2017 latest 2017
A theme with publications in the last 5 years is one that has at least one publication within the 5 years ending at the latest publication year. It is based on publication records alone and does not show whether the research is currently under way.