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The development of an advanced multi-axis myo-prosthesis and controller
No full textCommercial myo-electrically controlled prostheses are currently single degree of fieedom devices with highly restrictive function. These artificial hands warrant high grip forces due to their planar pincer movement to ensure stable prehension, thereby inherently requiring precise and conscious effort on the part of the wearer to ensure optimum grip.
The Southampton Hand has demonstrated the ability to devolve low-level user control to the hand prosthesis itself by the use of the Southampton Adaptive Manipulation Scheme. Until recently these multiple-axis prostheses have lacked clinical significance due to poor reliability and user-oriented design.
The development of the latest device is centred on the hypothesis of enhancing stable piehension by increasing the adaptability of the prosthesis, whilst simultaneously minimising the necessary grip force. This is to be achieved by increasing the number of independent degrees of freedom of the device without compromising user-effort by utilising the Southampton hierarchical control system. Constraints such as modularity, low weight and power consumption are factors that have been adhered to throughout the design process.
The six independent axes of the hand are controlled by a single microprocessor. The limiting factor in the advancement of artificial hands has frequently been the integration of technology to the device. Consequently several accurate sensing systems were implemented in this design to enable a more comprehensive control of the adaptable hand prosthesis
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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