Feedback Controlled Software Systems

Software systems generally suffer from a certain fragility in the face of disturbances such as bugs, unforeseen user input, unmodeled interactions with other software components, and so on. A single such disturbance can make the machine on which the software is executing hang or crash. We postulate that what is required to address this fragility is a general means of using feedback to stabilize these systems. In this paper we develop a preliminary dynamical systems model of an arbitrary iterative software process along with the conceptual framework for stabilizing it in the presence of disturbances. To keep the computational requirements of the controllers low, randomization and approximation are used. We describe our initial attempts to apply the model to a faulty list sorter, using feedback to improve its performance. Methods by which software robustness can be enhanced by distributing a task between nodes each of which are capable of selecting the best input to process are also examined, and the particular case of a sorting system consisting of a network of partial sorters, some of which may be buggy or even malicious, is examined

Scarlet & Silver Jubilee

Program listing performers and works performe

Enterprise Strategic Analysis for Transformation for the Materiel Enterprise

INFORMS Annual Meeting presentatio

LAI Working With the US Army for Enterprise Transformation

Overview • Eric Rebentisch: LAI/Army ESAT overview (Army Materiel Enterprise, System of Systems Engineering), reflections on the ESAT process • Nancy Moulton: Army Materiel Enterprise (ME) reflections on the experience, on-going efforts and progress • Jerry Coover: Implementation efforts and change dynamics, other enterprise perspectives • Panel discussion and Q&

Lean Aerospace Initiative (LAI) MIT Research Studies Applicable to Systems Engineering

This publication contains abstracts for past research thesis projects related to systems engineering completed within the LAI research group at Massachusetts Institute of Technology

Compilation of Lean Now! Project Reports

LAI repor

Hermeneutical Healing: Physical Therapy with a Gadamerian Twist

In recent decades, phenomenology has been utilized not only as a conceptual framework from which to understand medical encounters in healthcare settings, but also to guide medical professionals in providing care. In the realm of physical therapy, phenomenology has been touted as a philosophically-based avenue to aid in helping to understand what it means to be a patient. The works of Edmund Husserl and Martin Heidegger have been utilized as paths to approach phenomenologically-informed care in physical therapy. However, to our knowledge, no significant connection has been made in regard to the work of Hans-Georg Gadamer’s phenomenology and hermeneutics in the realm of physical therapy. The authors aim to close that gap by showing the ways in which Gadamer’s philosophy can help physical therapists provide phenomenologically-informed patient care. They begin by outlining some of the touchpoints between phenomenology and healthcare and then introduce Gadamer as a figure who deserves attention in the question of how to apply phenomenology to healthcare settings. Upon analyzing Gadamer’s account of what it means to experience an altered body, they outline Gadamer’s understanding of tact, practical knowledge, and good sense in order to show how to understand at a conceptual level what it means to empathize with patients on the path to building therapeutic alliance, that is, a cooperative working relationship. They then look closely at Gadamer’s hermeneutics and particularly his comments on how to cultivate a fusion of horizons in order to attempt to help guide physical therapists in theoretically understanding how to empathize with their patients. Ultimately, they argue that physical therapists who practice phenomenologically-informed care, which they call “hermeneutical healing,” are positioned well to form strong working relationships with their patients. Keywords: Medical Humanities, Phenomenology, Hermeneutics, Gadamer, Fusion of Horizon