Simulating scratch behavior of polymers with mesoscopic molecular dynamics

Part replacement and repair is needed in structures with moving parts because of scratchability and wear. In spite of some accumulation of experimental evidence, scratch resistance is still not well understood. We have applied molecular dynamics to study scratch resistance of amorphous polymeric materials through computer simulations. As a first approach, a coarse grain model was created for high density polyethylene at the mesoscale. We have also extended the traditional approach and used real units rather than reduced units (to our knowledge, for the first time), which enable an improved quantification of simulation results. The obtained results include analysis of penetration depth, residual depth and recovery percentage related to indenter force and size. Our results show there is a clear effect from these parameters on the tribological properties. We also discuss a "crooked smile" effect on the scratched surface and the reasons for its appearance.

Needs and Opportunities in Ambient Assisted Living in Portugal

The exponential raise in the age dependency rate together with the difficulties in having conventional care solutions opens the space for the appearance and development of innovative Ambient Assisted Living (AAL) solutions.However, the development of these solutions requires a thorough understanding of user needs and wills. In this paper we present the scenarios being adopted in the context of AAL projects, as well as the products and services current available in each of the considered utilization scenarios. The needs of the Portuguese AAL users are analyzed through the discussion of some preliminary results from a survey targeted at the Portuguese population over 55 years old. These results will be used to characterize the needs and establish the readiness and willingness of elder Portuguese population in using AAL solutions.

Contribution towards a reflection about methodological strategies in design education and the function of drawing in design

This work presents a reflection on Design education and specifically on the role of Drawing in this area. As a subject, Design has expanded its field of action expanding into new areas such as Experience Design or Service Design. It became necessary for the designer to have more than an education based on technological knowledge or know-how. Many authors like Meredith Davis, Don Norman or Jamie Hobson point out the urgency to review the curricula of Design courses because nowadays “… design is more than appearance, design is about interaction, about strategy and about services. Designers change social behavior” (Norman 2011). When shifting from a product-centered design to a person-centered design (in a structure, a service or in a relationship) what should the function of drawing in a design course be? What should its curriculum be? Our work methodology will be to confront today’s perspectives on design theory and practice in an attempt to add to the discussion on the methodological strategies in design teaching in the contemporary context.

Contributo para uma reflexão sobre estratégias metodológicas no ensino do Design e a função do Desenho em Design

Neste trabalho apresentaremos uma reflexão sobre o ensino do Design e, especificamente, sobre a função do Desenho nessa área disciplinar. O Design, enquanto disciplina, alargou a sua área de actuação diversificando-se em novos campos como o Design de Experiência ou o Design de Serviço, não bastando ao designer uma formação ligada ao conhecimento tecnológico, ou ao “saber-fazer”. Diversos autores, como Meredith Davis, Don Norman ou Jamie Hobson, alertam para a urgência de uma reflexão aprofundada sobre as estruturas curriculares dos cursos de Design, já que na actualidade “(…) design is more than appearance, design is about interaction, about strategy and about services. Designers change social behavior” (Norman, 2011). Na passagem de um design centrado na forma, para um design centrado na pessoa (numa estrutura, num serviço, ou numa relação) qual deverá ser a função do desenho num curso de design? Qual deverá ser a sua estrutura programática? Como metodologia de trabalho iremos confrontar perspectivas actuais da teoria e da prática do design que equacionam esta problemática procurando, deste modo, contribuir para a reflexão de estratégias metodológicas no ensino do design no contexto contemporâneo.

Contribution towards a reflection about methodological strategies in Design Education and the function of Drawing in Design

This work presents a reflection on Design education and specifically on the role of Drawing in this area. As a subject, Design has expanded its field of action expanding into new areas such as Experience Design or Service Design. It became necessary for the designer to have more than an education based on technological knowledge or know-how. Many authors like Meredith Davis, Don Norman or Jamie Hobson point out the urgency to review the curricula of Design courses because nowadays “ … design is more than appearance, design is about interaction, about strategy and about services. Designers change social behavior” (Norman, 2011) When shifting from a product-centered design to a person-centered design (in a structure, a service or in a relationship) what should the function of drawing in a design course be? What should its curriculum be? Our work methodology will be to confront today’s perspectives on design theory and practice in an attempt to add to the discussion on the methodological strategies in design teaching in the contemporary context.

Reflexão sobre estratégias metodológicas no ensino do design e a função do desenho em design

Neste trabalho apresentaremos uma reflexão sobre o ensino do Design e, especificamente, sobre a função do Desenho nessa área disciplinar. O Design, enquanto disciplina, alargou a sua área de actuação diversificando-se em novos campos como o Design de Experiência ou o Design de Serviço, não bastando ao designer uma formação ligada ao conhecimento tecnológico, ou ao “saber-fazer”. Diversos autores, como Meredith Davis, Don Norman ou Jamie Hobson, alertam para a urgência de uma reflexão aprofundada sobre as estruturas curriculares dos cursos de Design, já que na actualidade “(…) design is more than appearance, design is about interaction, about strategy and about services. Designers change social behavior” (Norman, 2011). Na passagem de um design centrado na forma, para um design centrado na pessoa (numa estrutura, num serviço, ou numa relação) qual deverá ser a função do desenho num curso de design? Qual deverá ser a sua estrutura programática? Como metodologia de trabalho iremos confrontar perspectivas actuais da teoria e da prática do design que equacionam esta problemática procurando, deste modo, contribuir para a reflexão de estratégias metodológicas no ensino do design no contexto contemporâneo.

Reflexão sobre Estratégias Metodológicas no Ensino do Design e a Função do Desenho em Design

Somos habitantes de um mundo que sofre constantes transformações estruturais em qualquer área. As tecnologias, a globalização e a política dos mercados, deslocam tudo e todos da sua zona de conforto, exigindo constantes adaptações a novos vocabulários e hábitos para os quais não temos antecedentes. Novas competências devem ser adquiridas face às novas exigências, e no ensino, base de uma preparação (pessoal e profissional), impõe-se uma constante revisão de estratégias metodológicas de aquisição e partilha de conhecimento. Neste trabalho apresentaremos uma reflexão sobre o ensino do Design e, especificamente, sobre a função do Desenho nessa área disciplinar. O Design, enquanto disciplina, alargou a sua área de actuação diversificando-se em novos campos como o Design de Experiência ou o Design de Serviço, não bastando ao designer uma formação ligada ao conhecimento tecnológico, ou ao “saber-fazer”. Diversos autores, como Meredith Davis, Don Norman ou Jamie Hobson, alertam para a urgência de uma reflexão aprofundada sobre as estruturas curriculares dos cursos de Design, já que na actualidade “(…) design is more than appearance, design is about interaction, about strategy and about services. Designers change social behavior.” Na passagem de um design centrado na forma, para um design centrado na pessoa (numa estrutura, num serviço, ou numa relação) qual deverá ser a função do desenho num curso de design? Qual deverá ser a sua estrutura programática? Como metodologia de trabalho iremos confrontar perspectivas actuais da teoria e da prática do design que equacionam esta problemática procurando, deste modo, contribuir para a reflexão de estratégias metodológicas no ensino do design no contexto contemporâneo.

Pectus Excavatum postsurgical outcome based on preoperative soft body dynamics simulation

Pectus excavatum is the most common congenital deformity of the anterior chest wall, in which an abnormal formation of the rib cage gives the chest a caved-in or sunken appearance. Today, the surgical correction of this deformity is carried out in children and adults through Nuss technic, which consists in the placement of a prosthetic bar under the sternum and over the ribs. Although this technique has been shown to be safe and reliable, not all patients have achieved adequate cosmetic outcome. This often leads to psychological problems and social stress, before and after the surgical correction. This paper targets this particular problem by presenting a method to predict the patient surgical outcome based on pre-surgical imagiologic information and chest skin dynamic modulation. The proposed approach uses the patient pre-surgical thoracic CT scan and anatomical-surgical references to perform a 3D segmentation of the left ribs, right ribs, sternum and skin. The technique encompasses three steps: a) approximation of the cartilages, between the ribs and the sternum, trough b-spline interpolation; b) a volumetric mass spring model that connects two layers - inner skin layer based on the outer pleura contour and the outer surface skin; and c) displacement of the sternum according to the prosthetic bar position. A dynamic model of the skin around the chest wall region was generated, capable of simulating the effect of the movement of the prosthetic bar along the sternum. The results were compared and validated with patient postsurgical skin surface acquired with Polhemus FastSCAN system