Agnius Liutkevicius

A Survey of Wireless Sensor Network Interconnection to External Networks

This paper aims at investigating the WSN (wireless sensor network) connectivity to external networks and infrastructures. It addresses research regarding existing techniques, mechanisms and devices that will provide connectivity of WSNs to external networks.

SMART HOME SERVICES DEVELOPMENT, PROVISIONING, AND MANAGEMENT FRAMEWORK

This paper presents the distributed service development and provisioning framework, which is designed to develop, provide, monitor and control various types of existing and future Smart Home applications and services. The framework allows service providers and managers to reduce their operating costs several times as the installation and management of the service is performed remotely and without changing the existing system and without any other additional intervention in the dwellings of end users. The main advantage of the proposed conceptual Framework design is the easy expansion and its difference from existing solutions as it allows integrating any type of services, developed by the third parties without modifying the framework architecture and may only require additional installation of home engineering equipment at users homes. Services are available for consumers via different terminal devices existing in the market: PDA, phones, TV sets, PCs, etc. The paper presents the concept and the communication, integration, architectural and service models for the proposed Framework, comparison with related research and results of case study. http://dx.doi.org/10.5755/j01.itc.40.2.432

Blood Pressure Estimation Accoording to Photoplethysmographic Signal Steepness

Abstract. The purpose of this paper is to prove the assumption that there is a correlation between the systolic blood pressure and the photoplethysmographic signal steepness. A method for indirect systolic blood pressure estimation based on photoplethysmographic signal steepness is proposed in this paper. Method: It is proved that based on Hooke’s law, the steepness of pressure and volume (diameter) of pulse waves differ by a constant. The coefficient for calculating arterial blood pressure when volume pulse wave steepness is known is presented in this paper. The Windkessel model is selected for the modeling. Experimental evaluation is based on veloergometrical trials. Volume pulse wave was obtained using a photoplethysmography device that is put on a finger. Blood pressure was measured using a semi-automatic OMRON blood pressure monitor. Results: The simulation of an arterial system using the Windkessel model shows that the steepness of pressure and volume pulse waves correlate. Ten veloergometrical trials were performed during the experimental evaluation. A significant 0.855±0.025 (p < 0.001) correlation between the photoplethysmographic signal steepness and the systolic blood pressure was obtained. The calculated and measured blood pressure values vary no more than ±5mmHg. Conclusions: The results demonstrate that the photoplethysmographic signal wavefront can be successfully applied in wearable devices that can be used for constant 24 hour registration of blood pressure for both home use and clinical practice. DOI: http://dx.doi.org/10.5755/j01.itc.44.4.12562

Methods for Smart Home Environment‘s Intellectualization: The Comparative Analysis

The difference between smart home (or smart agent) and intellectual- ized smart home (or intellectual smart agent) is delivered, and the framework for their modelling is described. Question of a sophisticated adequacy evalua- tion is raised to compare the reality and its model. The proposed approach was used to evaluate four different decision making technologies implemented in the models of the intellectualized smart home environment, and the comparison of those experimental technologies prepared by expert is presented.

Solution of the Augmenting Sequence of Linear Programming Problems as a Tool for the Intellectual Home Environment’s Self-Training

This work presents the solution based on the augmenting sequence of linear programming problems (LPP) as a tool for intellectualizing home environment. The proposed solution empowers the intelligent decision making procedure which can be applied to various intelligent control applications. The augmenting self-training procedure based on LPP approach is presented as well, which allows making reasonable decisions having only limited data about the controlled environment. The method permits retraining the decision making system when new data is available. As a proof of concept, this solution is applied to intelligent light control application. The obtained simulation results show the method’s capability in making reasonable decisions according to users preferences. DOI: http://dx.doi.org/10.5755/j01.itc.44.2.10235

Functional organization of an artificially intellectualized home environment based on mandami and takagi-sugeno procedures

A substantial amount of scientific research and publications in the smart home domain deal with different aspects of fuzzy logic application. However, we feel there is a general lack of complex modelling done of the whole smart home environment. So, the main goal of this paper is threefold: 1) to present a virtual model of a smart home environment to be intellectualized, 2) to demonstrate the efficiency of Mamdani type inference procedure in modelling of intellectual behaviour of the environment and 3) to show that it is possible to minimize the quantity of fuzzy rules by taking the hierarchical approach and adding the Takagi- Sugeno inference procedure to empower it. The results of computerized modelling and simulation are delivered in the paper demonstrating the practical viability and efficiency of the theoretical approach. The model of the intelligent home environment was used in two projects. Since a formalized analytical method for evaluating the sensitivity of system parameters still does not exist, the experimental sensitivity simulation in our case is performed and presented in this paper. Characteristics obtained in the modelled virtual environment can be easily expanded and used in a real home environment by changing pixels into real coordinates and the light intensity into other real variables.

μSWN interconnection to external networks for healthcare applications

As wireless sensor networks (WSNs) are adopted more and more in every day life applications, their interconnection to external networks and infrastructures become mandatory for increasing the usability and flexibility especially in healthcare application scenarios. This paper presents techniques, mechanisms and devices that provide the WSN under study the ability to connect to external networks in an efficient way transparently to the end user.