177,983 research outputs found
Operating room planning and scheduling: A literature review.
No full textThis paper provides a review of recent research on operating room planning and scheduling. We evaluate the literature on multiple fields that are related to either the problem setting (e.g. performance measures or patient classes) or the technical features (e.g. solution technique or uncertainty incorporation). Since papers are pooled and evaluated in various ways, a diversified and detailed overview is obtained that facilitates the identification of manuscripts related to the reader's specific interests. Throughout the literature review, we summarize the significant trends in research on operating room planning and scheduling and we identify areas that need to be addressed in the future.Health care; Operating room; Scheduling; Planning; Literature review;
Perception of room modes in critical listening spaces
No full textRoom modes are a recognised problem in small critical listening rooms and are known to cause colouration of sound reproduced within them.
Investigations on the causes and solutions for this problem have been carried out for some time. Interest in the topic has extended to loudspeaker manufacturers who have mainly concentrated in developing methods for controlling the loudspeaker-room interaction in order to ameliorate low frequency reproduction.
Compared to objective work on passive and active control methods, the study of the subjective perception of room resonances has been somewhat neglected. Available publications mostly concern the effects of single resonances, which are perhaps not fully representative of conditions as experienced in real rooms.
A study into the subjective perception of room modes is presented. The experimental methodology employs psychoacoustic techniques to study the perception of factors such as modal distribution, and effects of resonances on single tones. Results show that the subjective perception of room modes is strongly affected by temporal issues, and that changes exerted merely on magnitude frequency response are detectable but not likely to remove the effects of resonances for all listeners.
Furthermore, it is shown that a reduction of the modal Q-factor, associated with a reduction of decay rates, has a significant effect in decreasing the detection of resonances. Q-factor difference limen were evaluated for three reference decay characteristics corresponding to reference Q-factors of 30, 10 and 1. The limen were 6±2.8, 10±4.1 and 16±5.4 respectively, meaning that detection of changes to modal decay decreases with decreasing decay time.
These results may be used to define more perceptually relevant design guidelines for critical listening environments, and indicate target criteria for control techniques used in room correction. The outcomes of this investigation will have repercussions on the design of better rooms for critical listening
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Computing Room Acoustics Using 3D FDTD: A Cuda Approach.
No full textIn seeking to model realistic room acoustics, direct numerical simulation can be employed. This paper presents 3D Finite Difference Time Domain schemes that incorporate losses at boundaries and due to the viscosity of air. These models operate within a virtual room designed on a detailed floor plan. The schemes are computed at 44.1kHz, using large-scale data sets containing up to 100 million points each. A performance comparison is made between serial computation in C, and parallel computation using CUDA on GPUs, showing up to 80 times speed-ups. Testing on two different Nvidia Tesla cards shows the benefits of the latest FERMI architecture for double precision floating-point computation
Characterisation of small room acoustics for audio production
No full textNowadays there is an explosion of home music production activities such as recording, mixing and mastering, which usually takes place in small spaces, which are not ideal for such tasks. Their reduced volume and the typical construction structure of homes, which usually have the common factor of strong walls facilitates the formation of standing waves and non diffuse sound decays which decrease the immersion sense and the realism of the program. The interference of the sound field with the relatively big size of the furniture and equipment in relation with the dimensions of the room affects also the quality of sound.
Coloration of sound perceived as a change of timbre, rhythm sensation and signal1 pitch is the main problem encountered in music reproduced in these spaces. It happens varying in a complicated way, as it depends on temporal and spatial variables. In order to minimize these problems, acoustic treatment needs to be applied to the room. The traditional ways of measuring rooms to assess this treatment had not taken in account the directionality of the sound energy and their effect in terms of perception of stereo image without blur estimation caused by harmful reflections, neither had taken in account what are the characteristics of neutral rooms.
This document aims to investigate the extraction and analysis of temporal and spatial distribution early sound decay. A method based on B-format signals is adapted to small rooms. It can map the spatial and temporal distribution of sound energy and diffuseness in three dimensions. Once the data is collected it is possible to extract the information in time and frequency domain and use it to infer issues of perception based on psychoacoustic models. The ultimate objective is to find out useful descriptors to characterize the acoustic quality in critical listening rooms
AHFE 2021 Best Paper Award
No full textA growing trend in healthcare is the notion of Acuity-Adaptable care /Universal Care patient room that is compelling hospitals to abandon the traditional approach to care where patients are transferred from unit to unit in search of the proper level of care with negative effects on healthcare quality. This paper reviews key design elements that support the success of an Acuity-Adaptable care /Universal care patient room, in particular, focusing on design solutions that attempt to adapt the patient room to the pathology level through the position of the ‘life support system’; balancing technological complexities with the human dimension; improving the organization of the staff’ work through the decentralization nurse stations
Subjective Validity of Figures of Merit for Room Aspect Ratio Design
No full textAttempts have long been made to classify a room's low frequency audio reproduction capability with regards
to its aspect ratio. Common metrics used have relied on the homogeneous distribution of modal frequencies
and from these a number of 'optimal' aspect ratios have emerged. However, most of these metrics ignore the
source and receiver coupling to the mode shapes - only a few account for this in the derivation of a figure of
merit. The subjective validity of these attempts is tested and discussed. Examples are given of supposedly
good room ratios with bad performance and vice versa. Subjective assessment of various room scenarios is
undertaken and a ranking order has been obtained to correlate with a proposed figure of merit
Design, development, and testing of an environmental P-T cell for infrared spectroscopy measurements
No full textWater absorption bands due to superficially adsorbed molecules often dominate the near-infrared spectra of particulate minerals and rocks, when measured in the laboratory in the reflectance mode. In order to remove this, the spectral effect is thus necessary to acquire spectra of samples in vacuum and at higher temperatures. With the aim to accomplish this task, we developed an environmental cell to perform infrared spectroscopic measurements at controlled pressure-temperature conditions. Currently the cell allows one to measure reflectance spectra in the temperature range from room values up to 300 °C (573 K), in the pressure range of 103-10-6 mbar. The acquisition of spectra continuously in two distinct phases, namely, during a preliminary pumping stage (at room T) and subsequently during a heating stage (in vacuum), permits to highlight and characterize separately the effect of pressure and temperature on infrared spectra. © 2018 Author(s)
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[Sarah T. Hughes Reading Room entrance 2]
No full textPhotograph of the entrance to the Judge Sarah T. Hughes Reading Room in Willis Library on the UNT campus. On the window the words "Judge Sarah T. Hughes Reading Room" are stenciled in paint. On the back of the photo is a handwritten note that reads "A. M. Willis Library - Sarah T. Hughes Reading Room - 1996"
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