We present a comprehensive approach for the design of adjustable-focus lenses based on the Alvarez principle. The design methodology consists of dividing the lens into two parts: the inner, optical part, where the optical quality is optimized, and the outer, mechanical part, connecting the optical part to the frame. For the optical part, we present a complete optical design methodology to minim...

In animals metabolic processes, involve complex organic molecules being broken down to simpler molecules, such as carbon dioxide and water. Carbon dioxide waste is removed from the body through respiration. Carbon dioxide content in fresh air is approximately 400 parts per million. In this study, we investigate the relationship between ventilation efficiency and carbon dioxide (CO2) concentrati...

We presents a mechanical characterization of oocyte for high-throughput quality evaluation. In order to achieve the biomedical disposable applications, our characterization system consists of only four parts: a sensing part, an actuation part, a flow-control part, and a robot integrated microfluidic chip (Robochip) as a disposable part. Robochip has advantages of both of micromechanical manipul...

This paper presents the development steps of a fast manipulator, up to the building of the experimental device, in a context of mechatronic design which implies the integration of several engineering disciplines. High performance of the manipulator has been achieved by means of the suitable integration of the mechanical part and the drive part. For the mechanical part we choose a 3-dof parallel...

BACKGROUND Classroom ventilation rates often do not meet building standards, although it is considered to be important to improve indoor air quality. Poor indoor air quality is thought to influence both children's health and performance. Poor ventilation in The Netherlands most often occurs in the heating season. To improve classroom ventilation a tailor made mechanical ventilation device was d...

Both cells and ants belong to the broad field of active matter, a novel class of non-equilibrium materials composed of many interacting units that individually consume energy and collectively generate motion or mechanical stresses. However cells and ants differ from fish and birds in that they can support static loads. This is because cells and ants can be entangled, so that individual units ar...

There are few studies about school-environment in relation to pupils' respiratory health, and Korean school-environment has not been characterized. All pupils in 4th grade in 12 selected schools in three urban cities in Korea received a questionnaire (n = 2,453), 96% participated. Gaseous pollutants and ultrafine particles (UFPs) were measured indoors (n = 34) and outdoors (n = 12) during winte...