We extend the classical Ostrowski numeration systems, closely related to Sturmian words, by allowing a wider range of coefficients, so that possible representations of a number n better reflect the structure of the associated Sturmian word. In particular, this extended numeration system helps to catch occurrences of palindromes in a characteristic Sturmian words and thus to prove for Sturmian w...

Advancing adult age is associated with functional declines in both the sensory and perceptual stages of visual information processing (see Schieber, 1992). This paper reviews the recent research literature (i.e., 1988-1994) which has attempted to assess the impact of age-related visual declines upon driving mobility, safety and performance. VISION LOSS AND DRIVING MOBILITY In a 10-year longitud...

Frank Gower Bergin passed away in his sleep on October 25th, after a prolonged period of restricted activity due to cardiac weakness. His father and brother were at one time Directors of Muller's Orphanage; two brothers were doctors, and a sister was for a while Casualty Sister at the General Hospital. With the late James Taylor, he pioneered radiological services in Bristol, working for many y...

Lester Reynolds Dragstedt was trained initially as a physiologist and subsequently became a surgeon. He achieved renown not only because of his intellectual and technical skills, but because he was able to utilize physiological principles to define the development of surgical procedures. A humble upbringing in Anaconda, Montana was followed by a scientific education in Chicago. His brief backgr...

In the first part of the course, we focused on optimal inference in the setting of point estimation (see Figure 12.2). We formulated this problem in the framework of decision theory and focused on finite sample criteria of optimality. We immediately discovered that uniform optimality was seldom attainable in practice, and thus, we developed our theory of optimality along two lines: constraining...

PURPOSE To describe the use of a ruler to increase the accuracy and customization of Lester Jones tube placement. MATERIALS AND METHODS This was a review of 92 patients who underwent minimally invasive conjunctivodacryocystorhinostomy using this instrument. RESULTS The success rate was 100%, with an average operating time of 15 minutes. In nine patients, late migration of the Jones tube int...