Mitre Corporation

About: Mitre Corporation is a company organization based out in Bedford, Massachusetts, United States. It is known for research contribution in the topics: Air traffic control & National Airspace System. The organization has 4884 authors who have published 6053 publications receiving 124808 citations. The organization is also known as: Mitre & MITRE.

Security for Mobile Agents: Authentication and State Appraisal

Abstract: Mobile agents are processes which can autonomously migrate to new hosts Despite its many practical benefits, mobile agent technology results in significant new security threats from malicious agents and hosts The primary added complication is that, as an agent traverses multiple hosts that are trusted to different degrees, its state can change in ways that adversely impact its functionality In this paper, we discuss achievable security goals for mobile agents, and we propose an architecture to achieve these goals The architecture models the trust relations between the principals of mobile agent systems A unique aspect of the architecture is a “state appraisal” mechanism that protects users and hosts from attacks via state modifications and that provides users with flexible control over the authority of their agents

Beyond usability evaluation: analysis of human-robot interaction at a major robotics competition

Abstract: Human-robot interaction (HRI) is a relatively new field of study. To date, most of the effort in robotics has been spent in developing hardware and software that expands the range of robot functionality and autonomy. In contrast, little effort has been spent so far to ensure that the robotic displays and interaction controls are intuitive for humans. This study applied robotics, human-computer interaction (HCI), and computer-supported cooperative work (CSCW) expertise to gain experience with HCI/CSCW evaluation techniques in the robotics domain. As a case study for this article, we analyzed four different robot systems that competed in the 2002 American Association for Artificial Intelligence Robot Rescue Competition. These systems completed urban search and rescue tasks in a controlled environment with predetermined scoring rules that provided objective measures of success. This study analyzed pre-evaluation questionnaires; videotapes of the robots, interfaces, and operators; maps of the robots' paths through the competition arena; post-evaluation debriefings; and critical incidents (e.g., when the robots damaged the test arena). As a result, this study developed guidelines for developing interfaces for HRI.

Modeling the effects of ionospheric scintillation on GPS/Satellite-based augmentation system availability

Abstract: [1] Ionospheric scintillation is a rapid change in the phase and/or amplitude of a radio signal as it passes through small-scale plasma density irregularities in the ionosphere. These scintillations not only can reduce the accuracy of GPS/Satellite-Based Augmentation System (SBAS) receiver pseudorange and carrier phase measurements but also can result in a complete loss of lock on a satellite. In a worst case scenario, loss of lock on enough satellites could result in lost positioning service. Scintillation has not had a major effect on midlatitude regions (e.g., the continental United States) since most severe scintillation occurs in a band approximately 20° on either side of the magnetic equator and to a lesser extent in the polar and auroral regions. Most scintillation occurs for a few hours after sunset during the peak years of the solar cycle. Typical delay locked loop/phase locked loop designs of GPS/SBAS receivers enable them to handle moderate amounts of scintillation. Consequently, any attempt to determine the effects of scintillation on GPS/SBAS must consider both predictions of scintillation activity in the ionosphere and the residual effect of this activity after processing by a receiver. This paper estimates the effects of scintillation on the availability of GPS and SBAS for L1 C/A and L2 semicodeless receivers. These effects are described in terms of loss of lock and degradation of accuracy and are related to different times, ionospheric conditions, and positions on the Earth. Sample results are presented using WAAS in the western hemisphere.

Minimal trellises for block codes

Abstract: Basic concepts in the study of trellises of block codes are defined. It is shown that minimal proper trellises exists for all block codes. Bounds on the size of such trellises are established. These bounds are shown to be exact for maximum distance separable codes and nearly so for perfect codes. >

Summarizing similarities and differences among related documents

Abstract: This summarization approach exploits the results of recent progress in information extraction to represent salient units of text and their relationships. By exploiting meaningful relations between units and the perspective from which the comparison is desired, the summarizer can pinpoint similarities and differences, generate composite summaries, and align text segments. These techniques have also been evaluated.