Jari Yli-Hietanen

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There is an increasing need for robust localization of signal sources of various types. With recent developments in sensory instrumentation, some of these needs can be answered. These new developments have also introduced new requirements. Sensor arrays and networks operate for long periods of time, perhaps unattended, and hardware malfunctions may occur(More)
We examine the role of big data and machine learning in cancer research. We describe an example in cancer research where gene-level data from The Cancer Genome Atlas (TCGA) consortium is interpreted using a pathway-level model. As the complexity of computational models increases, their sample requirements grow exponentially. This growth stems from the fact(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)
OBJECTIVE To evaluate the impact of the reorganization of oral AC treatment management in a primary healthcare setting in terms of quality of care and cost of care. The evaluated reorganization involved the adoption of an AC nurse service model supported by the use of information and communication technology for storing and handling follow-up data. DESIGN(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)
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)
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)
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)
We introduce an adaptive algorithm for constraining the amplitude of speech signals while at the same time trying to maintain the subjective loudness and trying not to produce disturbing artifacts. The algorithm can be applied to compensate for the clipping distortion of amplifiers in speech reproduction devices. The algorithm analyzes the speech signal on(More)