Cryptography from tensor problems

We describe a new proposal for a trap-door one-way function. The new proposal belongs to the "multivariate quadratic" family but the trap-door is different from existing methods, and is simpler

Facing the Mirror: Dilemmas and Issues Encountered on a TESOL programme in an International University Environment

Abstract: This paper investigates the experiences of three postgraduate students studying on an MA TESOL and Applied Linguistics course in a British university context. It demonstrates how subtle discourses of „ownership‟ of English (Holliday, 2014; Pennycook, 1994, 2001; Kumaravadevelu, 2003) persist in such training contexts, despite the general shift towards internationalizing higher education environments in the UK. The paper will discuss how the participants negotiated the teaching practice components of the course, and the issues they faced through being „non-native‟ speakers of English. It further examines the impact this had on their professional development and self-perceptions of „legitimacy‟ as teachers of English. The different constructs of a TESOL teacher are discussed and the need for a heightened awareness of training needs for teachers across diverse contexts

The modeling and simulation of feedback control systems

A brief description of the principles of mathematical models and their development is given. It should serve as an introduction to those unfamiliar with the topic

The behavior of renal-regulating hormones during hypogravic stress

The regulation of fluid and electrolyte behavior during space flight is believed to be under control, in large part, of a group of hormones which have their major effects on renal excretion. The hormones studied include renin-angitensin, aldosterone, and antidiuretic hormone (ADH). The regulatory systems of these renal-regulating hormones as they act individually and in concert with each other are analyzed. The analysis is based on simulations of the mathematical model of Guyton. A generalized theory is described which accounts for both short-term and long-term behavior of this set of hormones

Validation of a model for investigating red cell mass changes during weightlessness

The model, both the conceptual model and simulation model, provided a convenient framework on which to demonstrate the commonality between such diverse stresses as descent from altitude, red cell infusions, bed rest, and weightlessness. The results suggest that all of these stresses induce an increased blood hematocrit leading to tissue hyperoxia and eventual inhibition of the erythyocyte producing circuit until the hyperoxic condition is relieved. The erythropoietic system was acting, in these situations, as if it were an hematocrit sensor and regulator. In these terms the decreases in red cell mass during Skylab may be explained in terms of normal feedback regulation of the erythropoietic system in the face of sustained decreases in plasma colume