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All mechanical designs pass through a series of formal and informal redesign steps, involving the analysis of functionality, manufacturability, cost and other life-cycle factors. The speed and eecacy of these steps has a major innuence on the lead time of the product from conceptualization to launching. In this paper we propose a methodology for(More)
The increasing demand for light emitting diodes (LEDs) has been driven by a number of application categories , including display backlighting, communications, medical services, signage, and general illumination. The construction of LEDs is somewhat similar to microelectronics, but there are functional requirements, materials, and interfaces in LEDs that(More)
All mechanical designs pass through a series of formal and informal redesign steps, involving the analysis of func-tionality, manufacturability, cost and other life-cycle factors. The speed and eecacy of these steps has a major innuence on the lead time of the product from conceptualization to launching. In this paper we propose a methodology for(More)
For machined parts, setup time is a major component of the total time required to manufacture a machined part from a stock. If the number of setups and hence setup time can be reduced, this will not only decrease the manufacturing time, but will also ensure better machining accuracy, require fewer work-holding devices and increase machine usage time. To(More)
Reliability is the ability of a part or product to perform as intended (i.e., without failure and within specified performance limits) for a specified time, in its life cycle application environment. Reliability specification and demonstration is an activity between customers and suppliers. In the absence of proper procedure, this activity may not meet the(More)
Development of prognostic approaches for insulated gate bipolar transistors (IGBTs) is of interest in order to improve availability, reduce downtime, and prevent failures of power electronics. In this study, a prog-nostic approach was developed to identify anomalous behavior in non-punch through (NPT) and field stop (FS) IGBTs and predict their remaining(More)
Failure precursors indicate changes in a measured variable that can be associated with impending failure. By identifying precursors to failure and by monitoring them, system failures can be predicted and actions can be taken to mitigate their effects. In this study, three potential failure precursor candidates, threshold voltage, transconductance, and(More)
N,N,N,N-tetradentate macrocyclic ligand (L) has been synthesized by the condensation of benzil and semicarbazide and characterized. On excitation by light of wavelength 350 nm, L exhibited a fluorescent peak at λmax = 454 nm, which showed ca 6 times enhancement in intensity with a blue shift on interaction with Zn2+. L has been found to act as a selective(More)
The fluorescence intensity of salicylaldehyde phenylhydrazone (L), in 1:1 (v/v) CH3OH:H2O was enhanced by ca. 100 times with a blue shift in emission maximum, on interaction with Pb2+ ion. No enhancement in fluorescent intensity of L was observed on interaction with metal ions - Na+, K+, Ca2+, Cu2+, Ni2+, Zn2+, Cd2+ and Hg2+. This signal transduction was(More)