We present a sensor network testbed that monitors a hallway. It consists of 120 load sensors and 29 passive infrared sensors (PIRs), connected to 30 wireless sensor nodes. There are also 29 LEDs and speakers installed, operating as actuators, and enabling a direct interaction between the testbed and passers-by. Beyond that, the network is heterogeneous, consisting of three different circuit boa...

In this paper, we analyze the behavior of a multiple element antenna system in an indoor environment based on the measurements taken in the Lucent Bell Labs building in Crawford Hill, NJ, with a system of 12 transmitters and 15 receivers. In particular, we investigate the capacity behavior with respect to the polarization of the transmitting/receiving elements and the distance between the trans...

BACKGROUND The guidelines approved by the American Thoracic Society in 2002 definitely recognize the six-minute walk test (6MWT) as a useful tool for the evaluation of physical efficiency in individuals with at least moderate chronic obstructive pulmonary disease, heart failure and intermittent dysbasia. So far, the American Thoracic Society has not approved the use of a treadmill to determine ...

The maturing science of the causes and consequences of boarding of admitted patients demonstrates unequivocally the dangers the patient may face when entering a crowded emergency department (ED). 1 Even the demonstration of increased mortality rates associated with crowding 2,3 has not compelled the hospital industry as a whole to implement policies and procedures to ameliorate crowding. Howeve...

This paper describes a vision-based navigation method in an indoor environment for an autonomous mobile robot which can avoid obstacles. In this method, the self-localization of the robot is done with a model-based vision system, and a non-stop navigation is realized by a retroactive position correction system. Stationary obstacles are avoided with single-camera vision and moving obstacles are ...

Under headings such as ubiquitous, invisible and ambient computing, new approaches to human-computer interfacing are investigated that give primacy to the physical world. It is envisioned that everyday objects and architectural spaces become the interfaces to an otherwise invisible computational system. In this abstract we examine three examples that explore this vision: a wall that is also a n...

Habituation is a form of non-associative learning observed in a variety of species of animals. Arguably, it is the simplest form of learning. Nonetheless, the ability to habituate to certain stimuli implies plastic neural systems and adaptive behaviors. This article describes how computational models of habituation can be applied to real robots. In particular, we discuss the problem of the osci...

In the Robot Vision Laboratory of Purdue University , we have developed two robust architectures for vision-guided mobile robot navigation in indoor environments. The rst approach, FINALE, enables the robot to autonomously navigate in hallways at speeds around 8m=min through vision-based position-updating, utilizing a geometrical map, model-based reasoning and Kalman ltering. The performance of...