András Nádas

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We present a novel radio interference based sensor localization method for wireless sensor networks. The technique relies on a pair of nodes emitting radio waves simultaneously at slightly different frequencies. The carrier frequency of the composite signal is between the two frequencies, but has a very low frequency envelope. Neighboring nodes can measure(More)
An ad-hoc wireless sensor network-based system is presented that detects and accurately locates shooters even in urban environments. The system consists of a large number of cheap sensors communicating through an ad-hoc wireless network, thus it is capable of tolerating multiple sensor failures, provides good coverage and high accuracy, and is capable of(More)
An ad-hoc wireless sensor network-based system is presented that detects and accurately locates shooters even in urban environments. The localization accuracy of the system in open terrain is competitive with that of existing centralized countersniper systems. However, the presented sensor network-based solution surpasses the traditional approach because it(More)
The paper presents a wireless sensor network-based mobilecountersniper system. A sensor node consists of a helmetmountedmicrophone array, a COTS MICAz mote for internodecommunication and a custom sensorboard that implementsthe acoustic detection and Time of Arrival (ToA) estimationalgorithms on an FPGA. A 3-axis compass providesself orientation and(More)
Experiences developing a sensor network-based acoustic shooter localization system are presented. The system is able to localize the position of a shooter and the trajectory of the projectile using observed acoustic events, such as the muzzle blast and the ballistic shockwave. The network consists of a large number of cheap sensors communicating through an(More)
Multihop message routing is a well studied and widely documented area of research in wireless sensor networks (WSN), where the dynamic and lossy nature of the wireless medium and severe resource constraints pose major challenges. The vast majority of related research focuses on reliable and power-efficient transfer of small amounts of data, such as low(More)
We have examined the exposure and conservation of antigenic epitopes on the surface envelope glycoproteins (gp120 and gp41) of 26 intact, native, primary human immunodeficiency virus type 1 (HIV-1) group M virions of clades A to H. For this, 47 monoclonal antibodies (MAbs) derived from HIV-1-infected patients were used which were directed at epitopes of(More)
OBJECTIVES To determine whether addition of an electronic sepsis evaluation and management tool to electronic sepsis alerting improves compliance with treatment guidelines and clinical outcomes in septic ICU patients. DESIGN A pragmatic randomized trial. SETTING Medical and surgical ICUs of an academic, tertiary care medical center. PATIENTS Four(More)
Using evidence-based guidelines to standardize the care of patients with complex medical problems is a difficult challenge. In acute care settings, such as intensive care units, the inherent problems of stabilizing and improving vital patient parameters is complicated by the division of responsibilities among different healthcare team members. Computerized(More)
The Mobile Air Quality Monitoring Network (MAQUMON) is presented. The system consists of a number of car-mounted sensor nodes measuring different pollutants in the air. The data points are tagged with location and time utilizing an on-board GPS. Periodically, the measurements are uploaded to a server, processed and then published on the SensorMap portal.(More)