No abstract

No abstract

This work analyzes the results of measurements on thermal energy harvesting through a wearable Thermo-electric Generator (TEG) placed on the arms and legs. Four large skin areas were chosen as locations for the placement of the TEGs. In order to place the generator on the body, a special manufactured band guaranteed the proper contact between the skin and TEG. Preliminary measurements were performed to find out the value of the resistor load which maximizes the power output. Then, an experimental investigation was conducted for the measurement of harvested energy while users were performing daily activities, such as sitting, walking, jogging, and riding a bike. The generated power values were in the range from 5 to 50 μW. Moreover, a preliminary hypothesis based on the obtained results indicates the possibility to use TEGs on leg for the recognition of locomotion activities. It is due to the rather high and different biomechanical work, produced by the gastrocnemius muscle, while the user is walking rather than jogging or riding a bike. This result reflects a difference between temperatures associated with the performance of different activities.

Health Maintenance systems are a special monitoring systems of the basic life functions. The goal of the work was to design and realize the wireless body sensor networks for on line vital function monitoring. The system is based on wireless sensors, information technologies and embedded computer systems. The man uses modified places where the monitoring systems that watch movement, position and chosen life functions are installed. In this case all the information about person's basic life functions and geographical location transmitted by wireless technology. All the measuring devices communicate with embedded microprocessor system wireless by Bluetooth or ZigBee technology. Ill. 3, bibl. 9 (in English; abstracts in English and Lithuanian). M. Cerny, M. Penhaker. Sveikatos priežiūros sistemoje naudojamų bevielio ryšio kūno jutiklių tinklas // Elektronika ir elektrotechnika. -Kaunas: Technologija, 2011. -Nr. 9(115). -P. 113-116.Sveikatos priežiūros sistema skirta bendrųjų gyvybinių funkcijų specialiajai stebėsenai. Bevielio ryšio kūno jutiklių tinklas yra sudarytas iš bevielio ryšio jutiklių, informacinių technologijų ir įterptinės kompiuterinės sistemos. Tokia sistema yra gana mobili ir geba sekti žmogaus būseną nepriklausomai nuo jo buvimo vietos. Informacija perduodama taikant bevielio ryšio technologiją. Visi jutikliai susieti su įterptine sistema taikant "Bluetooth" ar "ZigBee" technologiją. Il. 3, bibl. 9 (anglų kalba; santraukos anglų ir lietuvių k.).

No abstract

No abstract

We developed a low power kinematic sensor, ActimedARM, incorporating three-axis accelerometer and magnetometer, a microcontroller ARM3, a ZigBee wireless communication and μSD memory storage. With embedded algorithms it can detect in real time the postures of the subject. A preliminary assessment conducted on 12 subjects reached a 97% correct classification rate. The device exhibits 32 days of autonomy on a 3600 mAh capacity battery, which makes it convenient for field experiments in true daily life.

No abstract