Knowledge representation for basic visual categories

This paper reports work on a model of machine learning which is based on the psychological theory of prototypical concepts. This theory is that concepts learnt naturally from interaction with the environment (basic categories) are not structured or defined in logical terms but are clustered in accordance with their similarity to a central prototype, representing the "most typical'' member

A.I. approaches in statistics

The role of pattern recognition and knowledge representation methods from artificial Intelligence with in statistics is considered. Two areas of potential use are identified and one, data exploration, is used to illustrate the possibilities. A method is presented to identify and seperate overlapping groups within cluster analysis, using an A.I. approach. The potential of such 'intelligent' approaches is stressed

A prototypical approach to machine learning

This paper presents an overview of a research programme on machine learning which is based on the fundamental process of categorization. This work draws upon the psychological theory of prototypical concepts . This theory is that concepts learnt naturally from interaction with the environment (basic categories) are not structured or defined in logical terms but are clustered in accordance with their similaritry to a central prototype, representing the "most typical" member. A structure of a computer model designed to achieve categorization is outlined and the knowledge representational forms and developmental learning associated with this approach are discussed

UK Large-scale Wind Power Programme from 1970 to 1990: the Carmarthen Bay experiments and the Musgrove Vertical-Axis Turbines

This article describes the development of the Musgrove Vertical Axis Wind Turbine (VAWT) concept, the UK ‘Carmarthen Bay’ wind turbine test programme, and UK government’s wind power programme to 1990. One of the most significant developments in the story of British wind power occurred during the 1970s, 1980s, and 1990s, with the development of the Musgrove vertical axis wind turbine and its inclusion within the UK Government’s wind turbine test programme. Evolving from a supervisor’s idea for an undergraduate project at Reading University, the Musgrove VAWT was once seen as an able competitor to the horizontal axis wind systems that were also being encouraged at the time by both the UK government and the Central Electricity Generating Board, the then nationalised electricity utility for England and Wales. During the 1980s and 1990s the most developed Musgrove VAWT system, along with three other commercial turbine designs was tested at Carmarthen Bay, South Wales as part of a national wind power test programme. From these developmental tests, operational data was collected and lessons learnt, which were incorporated into subsequent wind power operations.http://dx.doi.org/10.1260/03095240677860621

Economic evaluation of typhoid - a review.

Introduction: To evaluate the potential economic value and likely impact of a hypothetical rapid test in its early stages of development requires the use of models. The model structure and the type of model (dynamic/static) to employ are key considerations. The aim of the review was to explore the literature on typhoid economic evaluations and to explore the types of models that have been previously adopted in this setting for test-treat evaluations and to capture data on model inputs that may be useful for a de novo model. Areas covered: A systematic review was conducted to identify economic evaluations focused on typhoid in established literature databases. Eight studies were identified and included for narrative synthesis. The review has revealed that there have been relatively few economic evaluations that have focused on typhoid fever, all of which have focused on the impact of interventions at the population level (vaccination) but not the individual level (test-treat strategies). Expert commentary: Under certain circumstances, either a static model or a transmission dynamic model may be appropriate in the evaluation of an intervention for typhoid fever. Typhoid test-treat modeling represents a gray area where further work is needed

Playing with the future: social irrealism and the politics of aesthetics

In this paper we wish to explore the political possibilities of video games. Numerous scholars now take seriously the place of popular culture in the remaking of our geographies, but video games still lag behind. For us, this tendency reflects a general response to them as imaginary spaces that are separate from everyday life and 'real' politics. It is this disconnect between abstraction and lived experience that we complicate by defining play as an event of what Brian Massumi calls lived abstraction. We wish to short-circuit the barriers that prevent the aesthetic resonating with the political and argue that through their enactment, video games can animate fantastical futures that require the player to make, and reflect upon, profound ethical decisions that can be antagonistic to prevailing political imaginations. We refer to this as social irrealism to demonstrate that reality can be understood through the impossible and the imagined

Retos para los sistemas sanitarios de Latinoamérica: ¿qué puede aprenderse de la experiencia europea?

ORIGINAL Resumen Este artículo compara los retos de los sistemas sanitarios latinoamericanos y la experiencia en Europa. El marco conceptual se centra en cuatro funciones: a) generar recursos; b) producir intervenciones; c) financiar, y d) «ejercer rectoría». Es a este nivel donde los actores pueden influir sobre el desempeño del sistema. Se identifican cinco retos para Latinoamérica: a) extender (prepago y solidaridad) la protección financiera; b) estabilizar en el tiempo dicha protección para épocas de crisis; c) equilibrar los recursos coherentemente con la capacidad de financiar servicios, d) aumentar la eficiencia ubicativa y técni-ca al producir servicios, y e) mejorar la función de rectoría de las demás funciones en los sectores público y privado (el más difícil y más importante reto hoy para los sistemas latinoamericanos). Se analiza luego la experiencia de reforma en Europa, presentando: a) experiencias sobre protección financiera en los sistemas tipo Beveridge y Bismarck; b) estabilidad en tiempos de crisis refrendada recientemente (Oeste) y con graves obstáculos (Este); c) el esfuerzo por equilibrar camas hospitalarias y profesionales sanitarios combinando regulación e incentivos; d) un aumento de la eficiencia en la producción de servicios priorizando más expresamente, dando voz a los pacientes, descentralizando la gestión y con incentivos de mercado, y e) una mejora de la rectoría no regulando menos sino mejor (y en algunos casos, más). Tres áreas de la experiencia europea sobresalen: a) combinar solidaridad con sostenibilidad financiera; b) introducir mesuradamente incentivos de mercado pero manteniendo un claro papel rector del Estado, y c) adoptar innovaciones en la organizacíon y producción de servicios. Pese a las dificultades metodológicas, la convergencia de los retos y las «soluciones» adoptadas justifica este análisis, pero las enseñanzas deben contemplarse desde cada contexto nacional. Un futuro artículo abordará las lecciones ofrecidas por las reformas de los sistemas latinoamericanos a las reformas europeas. Palabras clave: Sistemas sanitarios. Reformas. Latinoamé-rica. Europa. Retos. Lecciones. Comparación. Abstract This article compares the challenges of health systems in Latin America and the experience in Europe. The framework is the analysis of four functions: a) to generate resources; b) to produce activities; c) to finance, and d) to exercise stewardship. It is at this level where actors can influence health system responsiveness. Five challenges are identified in Latin America: a) to extend (prepayment and solidarity) financial protection; b) to stabilise that protection for crisis times; c) to equilibrate resources in accordance to capacity for financing services; d) to increase efficiency (technical and of placement) to produce services, and e) to improve the stewardship function in public and private sectors (the most important and difficult challenge LatinAmerican systems have nowadays). The experience of reform in Europe is analysed, showing: a) experiences about financial protection in Beveridge and Bismarck systems; b) stability in crisis times, recently confirm (West) and with important obstacles (East); c) efforts to equilibrate hospital beds and health care professionals, combining regulation and incentives; d) increase of efficiency in services production, with more express prioritisation, empowering patients, decentralising management and with market incentives, and e) improvement of stewardship with better (not less, sometimes even more) regulation. Three areas of European experience stand out: a) to combine solidarity with financial sustainability; b) to introduce market incentives in a measured way, but maintaining a clear stewardship role for the state, and c) to adopt innovations in organising and producing services. In spite of methodological difficulties, convergence of challenges and adopted solutions justify this analysis, but learning must be seen in each national context. A future article will analyse lessons offered by reform in Latin-American systems for European reforms

The British List: a checklist of birds of Britain (9th edition)

No abstract available