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Displaying 76 - 100 of 185

Development of Tools for Measuring the Performance of Computer Assisted Orthopaedic Hip Surgery Systems

December 28, 2007

Author(s)

Nicholas G. Dagalakis, Yong Sik Kim, Daniel S. Sawyer, Craig M. Shakarji

In the late seventies a sensor was invented, which could track the movement of athlete body parts. In the early eighties an improved version of this sensor was introduced, by a group of NIST researchers, for the calibration and the performance testing of

NIST Medical Phantom Device to Assist With the Calibration and Performance Testing of CAOS Systems

November 9, 2007

Author(s)

Nicholas G. Dagalakis, James B. Stiehl, Yong Sik Kim, Daniel S. Sawyer, Craig M. Shakarji

According to expert othopaedic surgeons there is need for medical phantom devices with dimensional metrology traceable to national standards metrology organizations in order to confirm basic Computer Assisted Orthopaedic Surgery (CAOS) systems performance

Design and Fabrication of an Operating Room Computer Assisted Orthopaedic Hip Surgery Artifact

August 17, 2007

Author(s)

Nicholas G. Dagalakis, Yong Sik Kim, Daniel S. Sawyer, Craig M. Shakarji

Hundreds of thousands of joint arthroplasty operations are performed throughout the world every year providing life saving relief from pain and return of mobility to the majority of the individuals who have this treatment. Clinical studies have shown that

Control of MEMS Nanopositioners With Nano-Scale Resolution

November 10, 2006

Author(s)

Jason J. Gorman, Yong Sik Kim, Nicholas Dagalakis

Several approaches for the precision control of micro-scale positioning mechanisms, or MEMS nanopositioners, are presented along with initial experimental results which demonstrate nano-scale positioning resolution. The MEMS nanopositioners discussed in

Design of an On-Chip Micro-Scale Nanoassembly System

November 3, 2006

Author(s)

Jason J. Gorman, Yong Sik Kim, Andras Vladar, Nicholas Dagalakis

In this paper, the design and proposed operation of a MEMS-based nanoassembly system is presented. The nanoassembly system is comprised of four nanomanipulators that can work independently or cooperatively. The design of the nanomanipulators will be

Probe-Based Micro-Scale Manipulation and Assembly Using Force Feedback

June 26, 2006

Author(s)

Jason J. Gorman, Nicholas Dagalakis

Repeatable manipulation and assembly of micro-scale components is a critical capability for future developments in opto-electronics, hybrid microelectromechanical systems, and the integration of nano-scale devices into larger systems. This paper focuses on

Three-dimensional Scanning Optical Tweezers

December 5, 2005

Author(s)

Thomas W. LeBrun, T W. Hwang, I Y. Park, Jun-Feng Song, Yong-Gu Lee, Nicholas G. Dagalakis, Cedric V. Gagnon, Arvind K. Balijepalli

There are several new tools for manipulating microscopic objects. Among them, optical tweezers (OT) has two distinguishing advantages. Firstly, OT can easily release an object without the need of a complicated detaching scheme. Secondly, it is anticipated

Analysis and Design of Parallel Mechanisms with Flexure Joints

December 1, 2005

Author(s)

Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman

Flexure joints are frequently used in precision-motion stages and microrobotic mechanisms due to their monolithic construction. The joint compliance, however, can affect the static and dynamic performance of the overall mechanism. In this paper, we

Design and Modeling of Thermally Actuated MEMS Nanopositioners

November 11, 2005

Author(s)

Sebastien Bergna, Jason J. Gorman, Nicholas G. Dagalakis

Several micro-scale nanopositioning mechanisms, or MEMS nanopositioners, have been developed for application in nanotechnology and optical sensors. In this paper, the design and modeling of these devices is presented along with initial experimental results

A Modular System Architecture for Agile Assembly of Nanocomponents using Optical Tweezers

September 10, 2005

Author(s)

Arvind K. Balijepalli, Thomas W. LeBrun, Cedric V. Gagnon, Yong-Gu Lee, Nicholas G. Dagalakis

In order to realize the flexibility optical trapping offers as a nanoassembly tool, we need to develop natural and intuitiveinterfaces to assemble large quantities of nanocomponents quickly and cheaply. We propose a system to create such aninterface that

Design Optimization for a Parallel MEMS Mechanism with Flexure Joints

October 4, 2004

Author(s)

Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman

This paper presents an analysis tool and design method forMEMS parallel mechanisms. Due to processing constraints inMEMS fabrication, flexure joints are frequently used in MEMSmechanisms. Flexure joints offer advantages over other joint designdue to their

Analysis and Design of Parallel Mechanisms with Flexure Joints

July 15, 2004

Author(s)

Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman

Flexure joints are frequently used in precision motion stages and micro-robotic mechanisms due lo their monolithic construction. The joint compliance, howeyer, can affect the static and dynamic performance of the overall mechanism. In this paper, we

Performance Analysis of Next-Generation LADAR for Manufacturing, Construction, and Mobility

May 6, 2004

Author(s)

William C. Stone, Maris Juberts, Nicholas Dagalakis, Jack A. Stone Jr., Jason J. Gorman

The NIST Construction Metrology and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is developing performance metrics and researching issues related to the design and development of a Next-Generation LADAR (laser