1,720,973 research outputs found
Evaluation of historical museum interior lighting system using fully immersive virtual luminous environment
No full textSaint Rocco Museum, a historical building in Venice, Italy is used as a case study to explore the performance of its' lighting system and visible light impact on viewing the large size art works. The transition from three-dimensional architectural rendering to the three-dimensional virtual luminance mapping and visualization within a virtual environment is described as an integrated optical method for its application toward preservation of the cultural heritage of the space. Lighting simulation programs represent color as RGB triplets in a device-dependent color space such as ITU-R BT709. Prerequisite for this is a 3D-model which can be created within this computer aided virtual environment. The onsite measured surface luminance, chromaticity and spectral data were used as input to an established real-time indirect illumination and a physically based algorithms to produce the best approximation for RGB to be used as an input to generate the image of the objects. Conversion of RGB to and from spectra has been a major undertaking in order to match the infinite number of spectra to create the same colors that were defined by RGB in the program. The ability to simulate light intensity, candle power and spectral power distributions provide opportunity to examine the impact of color inter-reflections on historical paintings. VR offers an effective technique to quantify the visible light impact on human visual performance under precisely controlled representation of light spectrum that could be experienced in 3D format in a virtual environment as well as historical visual archives. The system can easily be expanded to include other measurements and stimuli. © 2013 SPIE
DYNAMIC VARIATIONS OF DIRECT AND REFLECTED SOUND PRESSURE LEVELS USING BEAMFORMING
No full textAncient theaters are used for live performances for a variety of venues, and there is a demand for
detail information relating to sound field within these remarkable historical architectural buildings.
The objectives methods used to examine these types of spaces for their room acoustic characteristics
are on site measurement at their current status and structural integrity, computer simulation and or
scale models incorporating the past archeological records for their architectural details that relate to
material and surface characteristics. The objective of this study is to demonstrate the ability to
visualize sound fields of real and simulated spaces. Research objectives are to capture a space sound
signature that significantly represents the characteristics of all architectural elements with their
contributions to the room acoustics toward their historical preservation, and to visualize the audible
impact of these elements, and represent these acoustic conditions within a virtual environment for the
general public to experience.
This paper describes a new approach in measuring the contribution of various frequency ranges for
evaluation of the existing condition of the Rome Coliseum. Data were measured using Acoustic
Camera spherical array, 120 channel data recorders, and utilizing various acoustic software for data
reduction, computer modelling, simulation and analysis. The measured and simulated results based on
these parametric studies are compared against selected well-known studies of Greek and Roman
theatres. As part of the new historical preservation effort, and given the historical records on the use
of materials with their unique surface characteristic, the frequency domain and spectral analysis are
used as input to the computer modelling, simulation and analysis of the space. Newly developed room
acoustic indicators provide a new approach in estimating the impact of the direct and reflected sound
contribution to the sound level available within the current space. The results show a new research
approach in room acoustics evaluation utilizing current standards and technique
Room acoustic design, measurement, and simulation techniques to reduce hospital noises within patients' environment
No full textExploratory analysis of noise reduction solutions in a psychiatric ward using beamforming techniques
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Measured and simulated room acoustic characteristics in three concert halls with unique architectural geometry using beamforming techniques
No full text- …
