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Dive into the research topics where Kari Hjelt is active.

Publication


Featured researches published by Kari Hjelt.


human-computer interaction with mobile devices and services | 2004

Touch Detection System for Mobile Terminals

Jani Mäntyjärvi; Kjell Nybergh; Johan Himberg; Kari Hjelt

Knowledge when the terminal is in the hand of the user is important information that can be exploited in mobile applications. We present a touch detection system for mobile terminals based on impedance measurements. Experiments for recognizing touch of various objects are presented. The results show that the system is capable of recognizing if the device is touched with different objects such as bare hands, cotton (used e.g. in pockets of trousers) and leather carrying case.


Archive | 2004

Terminal and associated method and computer program product for monitoring at least one activity of a user

Kari Hjelt; Jonni Friman; Jyrki Jarvi; Santtu Naukkarinen; Jarkko Ollikainen


Archive | 2004

System, method and computer program product for managing physiological information relating to a terminal user

Kari Hjelt; Santtu Naukkarinen; Jukka Nihtilä; Tapani Ryhänen; Timo Vitikainen


Archive | 2004

Arrangement for authentication of a person

Tapani Ryhänen; Kari Hjelt


Archive | 2003

System and method for implementing sensor functionality in mobile devices

Kari Hjelt; Santtu Naukkarinen; Tapani Ryhänen; Jarkko Sairanen; Jukka Salminen; Samuli Silanto; Ulrica Bohne; Michel Gillet; Juha Rakkola


Archive | 2004

Improved sensing arrangement

Tapani Ryhänen; Kari Hjelt


Archive | 2002

Body fat monitoring system and method employing mobile terminal

Kari Hjelt; Kjell Nybergh; Jari Hyyryläinen; Tapani Ryhänen; Santtu Naukkarinen


Archive | 2002

MOBILE ELECTRONIC THREE-DIMENSIONAL COMPASS

Santtu Naukkarinen; Tapani Ryhänen; Kari Hjelt; Kai Inha


Archive | 2004

Sensor body and mobile terminal device including the sensor body

Kari Hjelt; Tapani Ryhaenen; ヘルト カリ; リハーネン タパニ


Archive | 2003

Body fat monitoring system and method employing terminal

Kari Hjelt; Jari Hyyryläinen; Santtu Naukkarinen; Kjell Nybergh; Tapani Ryhänen

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