The Locust infared system provides location information and messaging without batteries and without its own network. The system is "privacy aware" in that it supplies information to the wearable computer user who can then control how much of this information is shared with others or the installed infrastructure. By combining the abilities of Locusts with an appropriately equipped wearable computer, the user can interact with web-like hyperlinks, graphics, and sounds virtually associated with objects in the physical world. In addition the user can annotate and change these links as desired. 1 The Need for an Indoor Location System The U.S. military's satellite-based Global Positioning System (GPS) can provide meter precision position information anywhere on the planet. Unfortunately, the radio frequencies used prevent the system from being effective indoors. However, many applications need indoor position information. For example, an indoor paging system might use position information t...

Since 1993, members of the MIT Wearable Computing Project have been engaged in a "living experiment, " incorporating wearable computing into their everyday lives. Such immediate access to computation power enables a unique lifestyle and has many social implications. Through the use of anecdotes, this paper will attempt to relate our observations on the perception and adoption of new technology, interface issues, collaboration, and privacy as related to the intimate use of wearable computing.

This memorandum is a companion document to the current version of the RTP protocol specification draft-ietf-avt-rtp-*.ftxt,psg. It discusses protocol aspects of transporting real-time services (for example, voice or video) over packet-switched networks such as the Internet. It compares and evaluates design alternatives for a real-time transport protocol, providing rationales for the design decisions made for RTP. Also covered are issues of port assignment and multicast address allocation. An appendix provides a comprehensive glossary of terms related to multimedia conferencing. This document is a product of the Audio-Video Transport working group within the Internet Engineering Task Force. Comments are solicited and should be addressed to the working group's mailing list at rem-conf@es.net and/or the author(s). INTERNET-DRAFT draft-ietf-avt-issues-02.ps May 9, 1994 Contents 1 Introduction 4 2 Goals 7 3 Services 9 3.1 Control and Data : : : : : : : : : : : : : : : : : : : : : : : : ...

Although talkhtg is an integral part of collaborative activity, there has been little computer support for acquiring and accessing the contents of conversations. Our approach has focused on ubiquitous audio, or the unobtrusive capture of voice interactions in everyday work environments. Because the words themselves are not available for organizing the captured interactions, structure is derived from acoustical information inherent in the stored voice and augmented by user interaction during or after capture. This paper describes applications for capturing and structuring audio from office discussions and telephone calls, and mechanisms for later retrieval of these stored interactions.

Teleporting is the ability to redirect a windowing environment to different computer displays. This paper describes the implementation of a teleporting system developed at Olivetti Research Laboratory (ORL). We outline two particular features of the system that make it powerful. First, it operates with existing applications, which will run without any modification. Second, it incorporates sophisticated techniques of personnel and equipment location which make it simple to use. Teleporting may represent a development in attempts to achieve a ubiquitous, personalised computing environment for all. 1 Introduction In the near future, communication networks will make it possible to access computing services from almost anywhere in the world. In addition, the number of computers readily available within an office is increasing. We would like to allow individuals to make use of such networked computing facilities as they move from place to place, whilst retaining the familiarity of their own...

Context awareness is an important functionality for wearable computers. In particular, the computer should know where the person is in the environment. This paper proposes an image sequence matching technique for the recognition of locations and previously visited places. As in single word recognition in speech recognition, a dynamic programming algorithm is proposed for the calculation of the similarity of different locations. The system runs on a stand alone wearable computer such as a Libretto PC. Using a training sequence a dictionary of locations is created automatically. These locations are then be recognized by the system in realtime using a hatmounted camera.

We present an implementation and evaluation of an Active Messages based communication system for tiny, wireless, networked sensors. The implementation includes two major software components. The first is the device based operating program which includes the communication subsystem, dispatch loop and AM handlers. The second is a communication library for general purpose host computers. Using an Atmel 8535 based device and an Intel Pentium II PC, we demonstrate an ad hoc networking application that uses Active Message primitives for multi-hop route discovery and packet delivery on silver dollar sized devices. We also make observations about the applicability of TCP/IP to the Tiny Networked Sensor regime.

Small, body-mounted video cameras enable a different style of wearable computing interface. As processing power increases, a wearable computer can spend more time observing its user to provide serendipitous information, manage interruptions and tasks, and predict future needs without being directly commanded by the user. This paper introduces an assistant for playing the real-space game Patrol. This assistant tracks the wearer’s location and current task through computer vision techniques and without off-body infrastructure. In addition, this paper continues augmented reality research, started in 1995, for binding virtual data to physical locations. 1.

Wireless ad-hoc sensor networks have the potential to provide the missing interface between the physical world and the Internet, thus impacting a large number of users. This connection will enable computational treatments of the physical world in ways never before possible. In this far reaching scenario, quality of service can be expressed in terms of accuracy and/or latency of observing events and overall state of the physical world. Consequently, one of the fundamental problems in sensor networks is the calculation of coverage, which can be defined as a measure of the ability to detect objects within a sensor filed. Exposure is directly related to coverage in that it is an integral measure of how well the sensor network can observe an object, moving on an arbitrary path, over a period of time.

In order to support location-aware applications it is necessary to locate people and equipmentin near real-time. To avoid unnecessary exposure of details of the underlying tracking and positioning systems, researchers have proposed an additional layer of indirection between sensors and applications: a location service. In this paper, we examine how such a service should acquire and integrate location data from multiple heterogeneous location subsystem. We propose a fusion algorithm based on a formally de#ned, hierarchical location model. The algorithm can identify and exploit overlaps among location sightings to improve accuracy. Moreover, inconsistencies can be detected and dealt with either by #nding the least common denominator, or the most likely alternative.