During the last 20 years, design-based research (DBR) has become a popular methodology for connecting educational theory, research and practice. The missing link between educational theory, research and educational practice is an ongoing issue and DBR is seen as an integrated methodology to bridge the gap. But is this as easy as it sounds? The purpose of the article is to identify and discuss i...

This paper aims to introduce System Dynamics (SD) in applying Drum Buffer Rope (DBR) methodology of Theory of Constraints (TOC) in a three-stage flow shop system that produces a single product. To the best of our knowledge, although there are a lot of TOC applications using discrete simulation in production scheduling with DBR methodology, there are not any TOC application of DBR methodology in...

Wavelength tunable sampled grating distributed Bragg reflector (SG-DBR) lasers used for telecommunications applications have previously demonstrated the ability for linear frequency ramps covering the entire tuning range of the laser at 100 kHz repetition rates. An individual SG-DBR laser has a typical tuning range of 50 nm. The InGaAs/InP material system often used with SG-DBR lasers allows fo...

In this paper, we extend design based routing (DBR), which is originally proposed for opaque wavelength division multiplexing (WDM) networks without waveband switching (WBS), to transparent WDM networks with WBS. We formulate and solve the corresponding integer linear programming (ILP) problems to facilitate the use of DBR for transparent WDM networks with WBS, referred to as DBR with Waveband ...

We report a methodology for the design of low-loss, high-reflectivity, amorphous silicon, overlay DBRs for glass waveguide devices. In order to improve the DBR reflectivity while minimizing the DBR-induced loss, we theoretically determine the optimum overlay thickness and establish an iterative deposition procedure to achieve this value. Details of the design criteria, measurement of the design...

This paper identifies ways in which conceptual, methodological and technical developments in e-research can contribute to solutions of key questions in learning science research and, in particular, design-based research (DBR). The paper focuses on DBR issues in three major areas: methodology, research process, and dissemination. By mapping DBR issues to the conceptual and technological features...

This study demonstrates the application of DBR structure into the remote phosphor structure to improve the angular correlated color temperature (CCT) deviation in white light-emitting diodes (WLEDs). In the experiment, the LED device with DBR structure yielded a higher luminous efficiency than a conventional structure. The CCT deviation can be improved from 1758K to 280K in a range of -70 to 70...

A compact, narrow-linewidth, tunable source of THz radiation has been developed for spectroscopy and other high-resolution applications. Distributed-Bragg-reflector ~DBR! diode lasers at 850 nm are used to pump a low-temperature-grown GaAs photomixer. Resonant optical feedback is employed to stabilize the center frequencies and narrow the linewidths of the DBR lasers. The heterodyne linewidth f...