This paper studies an attribute control chart for monitoring the number of nonconforming items using a triple sampling (TS-np) which has not yet been applied to attribute control charts. The chart design and procedure for the decision about the state of the process are given. Mathematical expressions for the average run length (ARL) for in-control and out-of-control processes and the average sample number (ASN) are given. A bi-objective genetic algorithm that seeks to minimize the ASN and the probability of type 2 error is implemented in order to optimize the design of the TS-np control chart. A comparison between TS-np, single sampling np (SS-np), double sampling np (DS-np), and multiple dependent state repetitive sampling (MDSRS) control charts is carried out in terms of the out-of-control average run length (). Tables of values for TS-np are presented in comparison with MDSRS and DS-np for various scenarios. The operation of the proposed control chart is shown through simulated data. Finally, it is concluded that the proposed TS-np chart has a better performance in terms of detecting small and moderate shifts in the process nonconforming rate in-control () compared with MDSRS and DS-np.
This document discusses the results of the implementation of the ThirdNational Survey on Public Perception of Science and Technology applied in Colombia. It analyzes the effect of education over some aspects related to the perception about Science and Technology of the Colombians, considering variables such as age and professionalization of the population. Methodologically, the research type is quantitative and descriptive; it uses statistical tools like frequency tables, histograms and subsampling techniques to avoid a biased comparison of the populations. The major findings presented are that the level of education acquired and the formal training actually have significance regarding the perceptions about science and technology in the studied population; it proved to affect the perception and attitude towards issues as the preference in the choice of a career for daughters and sons, the tendency for reviewing instructions and exploring the use of the information, the perception of whether the country works on science or not, and if people make science and technology. In the future, it will be required an approach based on differential studies, addressing the impact of the dissemination of science and technology. RESUMEN:Este documento analiza los resultados de la aplicación de la Tercera Encuesta Nacional sobre Percepción Pública de la Ciencia y la Tecnología aplicada en Colombia. Analiza el efecto de la educación sobre algunos aspectos de la percepción sobre la ciencia y tecnología, teniendo en cuenta variables como la edad y la profesionalización de la población. Metodológicamente, el tipo de investigación es cuantitativa y descriptiva; utiliza herramientas estadísticas como tablas de frecuencias, histogramas y técnicas submuestreo para evitar una comparación sesgada de las poblaciones. Los principales hallazgos presentados son que el nivel de educación adquirido y la formación tienen realmente un efecto en lo que respecta a las percepciones sobre la ciencia y la tecnología en la población estudiada; se demuestra que se afecta su percepción y actitud en cuestiones como la preferencia en la elección de una carrera para hijas e hijos, la tendencia en revisión de instrucciones y exploración del uso de información, la opinión sobre si en el país se trabaja en ciencia o no y si la gente hace ciencia y tecnología. Se concluye sobre la importancia de futuros estudios diferenciales para el reconocimiento del impacto de la divulgación de la Ciencia y la Tecnología.
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