We describe an indoor, portable, standardized course that can be used to evaluate obstacle avoidance in persons who have ultralow vision. Six sighted controls and 36 completely blind but otherwise healthy adult male (n=29) and female (n=13) subjects (age range 19-85 years), were enrolled in one of three studies involving testing of the BrainPort sensory substitution device. Subjects were asked ...

In the case of low immersion high-speed milling, the ratio of time spent cutting to not cutting can be considered as a small parameter. In this case the classical regenerative vibration model of machine tool vibrations reduces to a simpli ed discrete mathematical model. The corresponding stability charts contain stability boundaries related to period doubling and Neimark-Sacker bifurcations. Th...

This paper reports on a variant of the rapid serial visual presentation (RSVP) technique for low vision reading called elicited sequential presentation (ESP). In both techniques, words are presented sequentially at a constant screen location, but with ESP, the reader elicits presentation of each new word by means of a button press, rather than (as with RSVP) being presented with it automaticall...

AIMS To develop standardised texts for assessing reading speed during repeated measurements and across languages for normal subjects and low vision patients. METHODS 10 texts were designed by linguistic experts in English, Finnish, French, and German. The texts were at the level of a sixth grade reading material (reading ages 10-12 years) and were matched for length (830 (plus or minus 2) cha...

BACKGROUND Fried's definition of frailty is widely used but its measurement is problematic. Timed up-and-go (TUG) is a simple measure of mobility that may be a useful proxy for frailty. Here, we describe the distribution of frailty and TUG in the older population of Ireland and discuss the extent to which TUG identifies the frail and prefrail populations. METHODS A total of 1,814 participants...

In this paper an analysis of the classical highorder Extremum Seeking Control (ESC) scheme is presented in comparison with an improved ESC variant proposed here. The proposed ESC scheme is based on a band-pass filter instead of the series combination of highpass and low-pass filters used in the classical ESC scheme. The relation between the search speed and the derivatives of the unknown input-...

PURPOSE To create and to validate a version of the Minnesota Low Vision Reading Test (MNREAD) acuity chart for the Portuguese language. METHODS The Minnesota Low Vision Reading Test acuity chart contain 19 sentences (logMAR 0.5 to 1.3) with 60 characters printed on three lines. All the sentences must have the same length with simple vocabulary. A total of 110 sentences were generated. The sen...

PURPOSE To develop standardized texts in Brazilian Portuguese to assess reading speed and compare performances among four European languages. METHODS 10 texts were designed by a linguistic expert at the level of a sixth grade reading material (reading ages 10-12 years) and were matched for length and syntactic complexity, according to the syntactic prediction locality theory of Gibson. Normal...

This paper presents the internet-based remote control of mobile robot. To face unpredictable Internet delays and possible connection rupture, a direct teleoperation architecture with “Speed Limit Module” (SLM) and “Delay Approximator” (DA) is proposed. This direct control architecture guarantees the path error of the robot motion is restricted within the path error tolerance of the application....