Bioprinting with ultrasound

Dr Rohan Shirwaiker is an associate professor in the Fitts Department of Industrial and Systems Engineering and an associate faculty in the Joint Department of Biomedical Engineering, Center for Additive Manufacturing and Logistics, and Comparative Medicine Institute at NC State University. He directs activities of the 3D Tissue Manufacturing research group which focuses on scalable 3D biofabrication technologies. Dr Shirwaiker has received recognitions including the NSF CAREER Award and SME Outstanding Young Manufacturing Engineer Award. He currently serves on the Advisory Board of IISE's Manufacturing & Design division and on the Scientific Committee of North American Manufacturing Research Institution of SME. In this exclusive interview, Rohan Shirwaiker discusses his current research on the use of ultrasound in bioprinting. This interview was conducted by Mike Gregg, Commissioning Editor for the Journal of 3D Printing in Medicine.

Metodologia de projeto ergonômico aplicada ao desenvolvimento de bancos de arremesso de atletas paralímpicos brasileiros

The objective of this article was to present and describe the project methodology implemented in the development of five throwing frames for paralympic athletes. The process was divided into project different phases / stages, which, although following a logical sequence of development, include activities performed simultaneously. The athletes and technicians were invited to participate in technical meetings with the research group at INT. These technical meetings were held throughout the project, so that athletes and their technicians could interact with the project team of the Three-Dimensional Models Laboratories (LAMOT) and Ergonomics Laboratory (LABER) athe Industrial Design Division at the National Institute of Technology. 3D motion captured and laser scanning captured with 1D anthropometric measurements were collected in order to provide information to the bank usability designer and anthropometric dimensions of the athletes. With this information, the LAMOT / DVDI project team developed project alternatives that were presented to the athletes and technicians. The chosen project frame alternative allowed greater rigidity to the seat. Athletes participated in all subsequent stages of prototype development and final testing in use. The conclusion was that the methodology provided a logical and comprehensible structuring of the product development process for all the actors involved in the project, even from different areas of activity, and thus, could contribute in a harmonic and productive way to the final result.

CAIP Application in OMM Operation for Box Primitive Feature: Inpection Code Generation for on Machine Measurement Operation

The aims of this research is to build CAIP systems on OMM operation which have an ability to measure workpiece automatically based on drawing data from design division at a machine. The flow of information between each part becomes important as the design of the drawing data from design division to production division or quality control. CAIP system (Computer Aided Inspection Planning) is expected to ensure the flow of drawing information to quality control without any changed even though the amount of data that a lot. CAIP system use early drawing data from the design division. The type of drawing data which is used by each CAD software is STEP drawing data. STEP data consists of products information such as surface geometry, line, point, and direction of the vector surface. The information that can be used to build a CAIP system is a feature. Therefore, a feature reconstruction process is necessary based on the data STEP geometry information. Feature types which is used in this study are a type of box primitive feature. A Probe, a measuring instrument, can be operated in CMM (Coordinate Measurement Machine) and CNC machine. A product measuring on CNC machine during or after machining process called OMM (On Machine Measurement) operation. As a result, measuring can be performed without moving the product from the machine. In this research, 5 Axis CNC machine with Heidenhain DMU150 iTNC530 controller is used.

Development of Computer Aided Inspection Planning (CAIP) Application in on Machine Measurement Operation (OMM) Operations for Box Primitive Features: Generating Inspection Codes

The aims of this research is to develop a Computer Aided Inspection Planning (CAIP) system in OMM operations which has an ability to measure workpieces automatically at a machine tools based on drawing data issued by the design division. The information that can be used to build a CAIP system is a feature. Therefore, a feature reconstruction process is necessary based on the data STEP geometry information. The Feature types used in this research is a type of box primitive feature. A Probe, a measuring instrument, can be operated in CMM (Coordinate Measurement Machine) and CNC machine. A product measuring on CNC machine during or after machining process called OMM (On Machine Measurement) operation. As a result, measuring can be performed without moving the product from the machine. In this research, 5 Axis CNC machine with Heidenhain DMU150 iTNC530 controller is used.

Using Student Preferences to Guide Design Team Composition

For five years now Stanford’s Mechanical Engineering Design Division has experimented with restrictions on how students choose the members of their design teams. The constraints are based on voluntary student responses to a short questionnaire, essentially a sampling of questions from the Myers-Briggs Type Indicator widely used for vocational and educational counseling. This has produced teams performing qualitatively and quantitatively better, as measured by prizes won in the nationwide Lincoln Foundation Design Competition, than did teams of the thirteen years preceding. In 1995, Stanford teams won all but two of the twelve prizes awarded. This article describes these experiments, lists the results, describes how to construct a suitable questionnaire, reviews pertinent psychological theory, and gives mathematically precise instructions for constraining construction of the teams. The current procedure also incorporates information obtained from a recent survey on team satisfaction in a different project design course. This modified method seeks to generate satisfied teams without sacrificing prize-winning ability.

Case Study of Overlay Performance on Rigid Pavement in Bowie County, Texas

A case study of flexible overlay performance on an old rigid pavement is presented. This special study was devised in cooperation with the Pavement Section of the Design Division of the Texas Department of Transportation to take advantage of a unique opportunity to study overlay effectiveness. Condition survey, roughness measurements, and deflection basins were taken before and after the removal of an old flexible overlay and after the construction of a new asphalt overlay. Subsequent analysis of the data shows that although the overlay restores the ride quality of a rigid pavement and eliminates dynamic loading caused by swelling subgrades, it can only slow, not reverse, fatigue in the underlying pavement structure.