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Placement Scheme (placement + scheme)

Distribution by Scientific Domains
Engineering50%

Selected Abstracts

New Optical Amplifier Placement Schemes for Broadcast Networks

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 1 2000
Jason Iness
WDM optical broadcast networks (based on the passive-star coupler) may encounter large splitting and attenuation losses that need to be compensated for using optical amplifiers, such as EDFAs. However, optical amplifiers are costly, so their total count in the network should be minimized. This study will examine three different such amplifier-placement schemes. The first approach utilize fewer amplifiers than previous schemes that do not add special hardware to avoid the near-far effect. The second study considers a bidirectionai-link network and it can use fewer amplifiers than a comparable unidirectional-link network. The third study minimizes the number of amplifiers when the amplifiers are equipped with special hardware to avoid the near-far effect, i.e., amplifiers are equipped with attenuators/filters to equalize amplifier input power on different wavelengths. [source]

A dental practice placement scheme: benefits for practitioners and undergraduates

EUROPEAN JOURNAL OF DENTAL EDUCATION, Issue 4 2001
A. K. H. Pau
Objectives: To report the feedback from general dental practitioners (GDPs) and dental undergraduates who participated in a general dental practice placement scheme. Methods:Subjects All 61 students in a year made 2 to 3 full day visits, individually or in pairs, to 44 general dental practices allocated to them. Thirty four GDPs completed and returned the questionnaire, representing a response rate of 77%. Data collection Formal feedback from the students and GDPs were obtained through 6 structured seminar sessions and a postal questionnaire respectively. Analysis Sifting, indexing and charting the data according to key issues and themes. Results: All 61 students attended the feedback sessions, 34 GDPs (response rate 77%) returned the questionnaire. The two most common themes that students reported having gained insight into were personal/professional development and practice management. The common positive aspects reported by the GDPs included exposure to the General Dental Service (GDS), motivation for undergraduate training and benefits for GDPs. These benefits included encouragement for the GDPs to reflect critically on their clinical practice, focus on their practice facilities and management, and stay in touch with developments in dental education. Through their visits and assignments, students gained skills in observation, interviewing, communication, relation-building and report writing. Conclusions: Placements of dental undergraduates in general dental practices enable students to gain insight into the GDS, develop key transferable skills and undergo professional socialisation. They are also beneficial and enjoyable for the GDPs who participated. [source]

Remeshing for metal forming simulations,Part I: Two-dimensional quadrilateral remeshing

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 11 2002
Dae-Young Kwak
Abstract In this paper, a general framework of practical two-dimensional quadrilateral remeshing, which includes the determination of remeshing time, automatic quadrilateral mesh generation, and data transfer process, will be formulated. In particular, the current work contains new algorithms of mesh density specification according to the distribution of effective strain-rate gradients, mesh density smoothing by fast Fourier transform (FFT) and low-pass filtering techniques, coarsening it by node placement scheme, and a modified Laplacian mesh smoothing technique. The efficiency of the developed remeshing scheme was tested through three practical two-dimensional metal forming simulations. The results clearly indicate that the algorithms proposed in this study make it possible to simulate two-dimensional metal forming problems efficiently and automatically. Copyright © 2002 John Wiley & Sons, Ltd. [source]