Jari Yli-Hietanen

Learn More
Personal use of this material is permitted. However, permission to reprint/ republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. ABSTRACT There is an increasing(More)
The use of small sensor arrays in modern signal processing systems has recently become more common due to the increase in computational processing power and interest in intelligent sensing and surveillance. However, not much information is available on the design of small sensor arrays having arbitrary geometry, that effectively can accomplish these tasks.(More)
In this paper, a new robust angle of arrival (AOA) estimation algorithm is presented for transient signals using sensor array data. The estimates are robust against sensor malfunction and the algorithm can cope with overlapping transients occurring on some sensors. The method is especially designed for transient signals having shorter duration than the(More)
There is an increasing interest in autonomous and unattended sensory systems, including applications in smart meeting rooms and surveillance of large areas. In these systems, direction of arrival (DOA) estimation has an important role. Although several time delay based algorithms have been proposed, little attention has been given to hardware failures and(More)
An approach coined as ldquoreflective information managementrdquo is presented as a technique for the management of emergency department chief complaint information. The architecture of a system integrating principles from this approach is described and its performance is evaluated in providing categorical information from free-text chief complaints for(More)
The utilization of information technology as tool in health care is increasing. The main benefits stem from the fact that information in electronic form can be transferred to different locations rapidly and from the possibility to automate certain information management tasks. The current technological approach for this automation relies on structured,(More)
Multi-delay predictive FIR filters utilizing a small number of multipliers are proposed. These filters are shown to have substantially lower noise gain than the standard minimum-length predictors using the same amount of multipliers. These filters are formulated for both arbitrary-order polynomial and sinusoidal signal prediction. The use of dynamic(More)
PURPOSE A large share of the information in electronic medical records (EMRs) consists of free-text compositions. From a computational point-of-view, the continuing prevalence of free-text entry is a major hindrance when the goal is to increase automation in EMRs. However, the efforts in developing standards for the structured representation of medical(More)
The goal of this study is to present the experiences gathered from the migration of an existing and deployed joint replacement surgery information system from a classical 2-tier architecture to a 4-tier architecture. These include discussion on the motivation for the migration and on the technical benefits of the chosen technical migration path and an(More)