scholarly journals On the Use of Perforated Sound Absorption Systems for Variable Acoustics Room Design

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 543
Author(s):  
Andreia Pereira ◽  
Anna Gaspar ◽  
Luís Godinho ◽  
Paulo Amado Mendes ◽  
Diogo Mateus ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Cost Effective ◽  
Room Acoustics ◽  
Acoustic Behavior ◽  
Sound Perception ◽  
Surface Appearance ◽  
Acceptable Solution ◽  
Acoustic Performance ◽  
Performance Requirements ◽  
Important Challenge

An important challenge for acoustic engineers in room acoustics design is related to the acoustic performance of multi-purpose auditoriums, which are typically designed to suit several performance requirements. With this intent, the analysis of several scenarios is usually performed individually, and then an acceptable solution, that may be adapted to several situations, is selected. One way of providing a more appropriate acoustic performance for each function of the auditorium is using variable sound absorption techniques to control reverberation and other relevant acoustic phenomena associated to sound perception. In this paper, the acoustic behavior of a perforated system that may be suitable for achieving a variable acoustic solution for room acoustic design is addressed. In the design of a cost-effective solution, the surface appearance is kept unchanged, while variable acoustic behavior is achieved either by closing the holes in the back face of the perforated panel or by placing a porous material in varying positions inside the backing cavity, thus accomplishing different acoustic requirements within a multipurpose auditorium. An analytical approach, based on the transfer matrix method is employed for preliminary acoustic sound absorption assessment provided by the system and to develop optimized solutions. Diffuse sound absorption is then computed and used to simulate, by the ray-tracing method, the acoustic behavior of a multipurpose auditorium to demonstrate efficient acoustic performance for different types of use.

Drywall Thermal Properties Exposed to High Temperatures and Fire Condition

2013 ◽  
Vol 62 (1) ◽  
Author(s):  
Md Azree Othuman Mydin
Keyword(s):  
Thermal Properties ◽  
High Temperatures ◽  
Fire Resistance ◽  
Residential Buildings ◽  
Cost Effective ◽  
Standard Fire ◽  
Performance Requirements ◽  
Cost Effective Technique ◽  
Fire Barrier ◽  
In Fire

Drywall is a widespread fire barrier used in house and general building construction. Drywall partitions and ceiling membranes are possibly the most common fire resistant construction approach employed in an extensive range of building types. The utilization of drywall board as prime fire protection of light-flame wood or steel construction is ubiquitous. Drywall board based systems are among those now broadly used, as walls or ceilings and it is principally employed as lining material in light-weight construction, which is a competent and cost effective technique of providing flexible partitioning assemblies in commercial and residential buildings. The thickness of the drywall board lining and the configuration of the framing can be flexibly changed to meet specified fire performance requirements. The use of such systems is increasing every day and there demands to be more research on their properties and behaviour. This paper will presents the properties of drywall board which will includes the assemblies and standard fire tests and the thermal properties of drywall in general and includes suggested properties of drywall by different researchers. Drywall boards shrink and crack at high temperatures, and this leads to collapse of parts of the drywall boards in fire. Fall-off of gypsum in fire affects the fire resistance of the assembly considerably, and cannot be overlooked when evaluating the fire resistance of drywall assemblies

Building simply: ethic or aesthetic? Thinking and making in an era of specialisation

2007 ◽  
Vol 11 (2) ◽  
pp. 112-117
Author(s):  
Gordon Murray
Keyword(s):  
Design Research ◽  
Research Unit ◽  
Recent History ◽  
Surface Appearance ◽  
Performance Requirements ◽  
History Of ◽  
History Of Architecture ◽  
Aesthetic Thinking

The recent history of architecture can be characterised as a battle between attention-grabbing, ‘iconic’ buildings and a counteracting tendency towards the aesthetically reduced, even avowedly ‘minimal’. But beneath the surface appearance of these contrasting formal tendencies – restless or serene, as demanded by their aesthetic ideals – the means of building have become relentlessly more complex to meet ever more demanding environmental and other performance requirements. It was against this background that the Design Research Unit at Cardiff University convened a one-day symposium to explore the possibility of ‘Building Simply’: the topic proved, not unexpectedly, elusive. Below we publish some reflections by Gordon Murray on some of the issues raised, and these are followed by three design papers – by Pierre d'Avoine, Roland Raderschall and the organisers – that addressed the topic from differing perspectives.

Integrating Knowledge, Performance, and Learning Systems

2011 ◽  
pp. 1595-1604
Author(s):  
Scott P. Schaffer ◽  
Ian Douglas
Keyword(s):  
Cost Effective ◽  
Content Management ◽  
Management Systems ◽  
Just In Time ◽  
Performance Requirements ◽  
Object Based ◽  
Sources Of Support ◽  
Time Basis ◽  
And Performance ◽  
Content Management Systems

Considerable effort has been devoted recently to development of systems or platforms that manage the learning, performance, or knowledge delivered to students and employees. These systems are generically labeled learning management systems (LMS), learning and content management systems (LCMS), performance support systems, and knowledge management systems (Rockley, 2002). Organizations increasingly use content management systems to deliver content objects to employees on a just-in-time basis to support knowledge and performance requirements (Rosenberg, 1999). While systems are developed that efficiently manage learning, knowledge, or performance, it seems desirable to consider how integration of each of these areas into a single system would benefit organizations. A major challenge to developing such systems has been the degree to which they are interoperable and the components within each are reusable. Reuse of data or information for learning or performance solution development is considered the primary driving force behind the movement toward object-based architectures for such systems (Douglas & Schaffer, 2002; Schaffer & Douglas, 2004). Ideas for integrating different sources of support for individuals and making its construction more cost effective have begun to take shape. Some efforts have focused on reusable and interchangeable (between different delivery systems) content objects, such as the U.S. Department of Defense Advanced Distributed Learning initiative (http://www.adlnet. org). A big challenge in development of support is the lack of a pedagogical model that takes advantage of object-based architectures while promoting collaboration and knowledge capture and sharing. A significant move in this direction has been outlined by Collis and Strjker (2003) who view the learner as a contributor of knowledge that may be captured and stored for reuse by future learners or course designers. An expansion of this idea, focused on in this article, is the reuse of the contributions of various members of a design and development team. This includes artifacts, decisions, and rationales related to activities such as the analysis of needs, identification of metrics, and identification of causes and possible solutions to workplace problems. This approach essentially attempts to link the analysis and design processes related to initial development of solutions with the ongoing adaptation and evaluation

scholarly journals The sound diffusion in Italian Opera Houses: Some examples

2020 ◽  
Vol 27 (4) ◽  
pp. 333-355
Author(s):  
Lamberto Tronchin ◽  
Francesca Merli ◽  
Massimiliano Manfren ◽  
Benedetto Nastasi
Keyword(s):  
Room Acoustics ◽  
Fundamental Aspect ◽  
Sound Perception ◽  
Italian Opera ◽  
Spatial Sound ◽  
Acoustic Quality ◽  
Architectural Constraints ◽  
The Rich ◽  
Opera Houses ◽  
Lateral Walls

Soundfield diffuseness in rooms is considered a fundamental aspect of a high-quality room acoustics. Since early studies by Hodgson up to more recent studies of Shtrepi and Embrechts, it was shown that high levels of sound diffuseness could guarantee blending of music, as well as spatial sound perception by listeners, and this could enhance the global indoor acoustic quality. Conversely, Italian-style Opera houses represent an important architectural place, in which the special features of the rich decorations, and the specific characteristics of the volume, give a unique atmosphere, including a peculiar psycho-acoustics impression. However, some geometric properties of the opera houses could influence the global acoustic perception. The shape of the marmorino wall on the stalls, as well as the parallelism of the lateral walls in the boxes, often causes a lack of spaciousness and sometimes in the worst cases provokes focalization. This phenomenon leads to design special devices that could be inserted in the theatres, to avoid focalization, even if they are rarely accepted. This article deals with the design of some acoustic diffusing panels and their functioning in three different theatres, combining both acoustics needs with architectural constraints. The article starts analysing and commenting on the issues that resulted from the measurements conducted in an Italian opera house. In the following step, three examples of the design of diffusing panels are proposed. Finally, the results of diffusion and scattering coefficient of panels realized in the last theatre considered here are reported.

Route Selection for Project Success: Addressing “Feeling/Perception” Issues

1998 ◽  
Author(s):  
M. Mohitpour ◽  
G. Von Bassenheim ◽  
Ardean Braun
Keyword(s):  
New Technologies ◽  
Selection Process ◽  
Cost Effective ◽  
Optimization Methods ◽  
Public Perceptions ◽  
Careful Consideration ◽  
Route Selection ◽  
Acceptable Solution ◽  
Pipeline Project ◽  
Selection For

Selecting a route for a pipeline right-of-way (ROW) generally consists of engineering (technical and economic), socioeconomic and biophysical components. To effectively select a route, simultaneous consideration must be given to all the components from the initiation of a project to the integration of all aspects of each throughout the route selection process. To successfully select a route which creates a win-win situation for all the stakeholders of a pipeline project, political/governmental issues, community and land owner views, public perceptions and other similar controlling factors (such as Safety, Health, Environment and Risk (SHER)) must be carefully analyzed and integrated into the process. It is the consideration of all these issues that will lead to a ROW which will provide a technically acceptable solution, which is at the same time the least expensive, economically viable and acceptable to the community it traverses. This paper will provide an overview of route selection techniques (including new technologies) used and the process generally practiced by pipeline designers, highlighting controlling issues and optimization methods that need to be utilized in order to achieve a cost effective route selection. It provides details on significant “Feeling/Perception” issues that can either thwart or, by careful consideration of these issues, lead to a successful pipeline project. An example of such a route selection process will be provided on a project located in rough and mountainous terrain, that has significant regulatory/governmental, land, environmental, indigenous and geological issues.

Greening the Gulag: Austerity, neoliberalism, and the making of the “green prisoner”

2019 ◽  
Vol 3 (4) ◽  
pp. 1120-1136
Author(s):  
B Jewell Bohlinger
Keyword(s):  
United States ◽  
Prison Population ◽  
Cost Effective ◽  
Mass Incarceration ◽  
The United States ◽  
Effective Strategies ◽  
The Past ◽  
Cost Cutting ◽  
Important Challenge ◽  
The Impact

Over the past 30 years the U.S. prison population has exploded. With the impact of climate change already here, we are also seeing new critiques of mass incarceration emerge, namely their environmental impact. In response to these burgeoning critiques as well as calls to action by the Justice Department to implement more sustainable and cost-effective strategies in prisons, the United States is experiencing a surge in prison sustainability programs throughout the country. Although sustainability is an important challenge facing the world, this paper argues that while “greening” programs seem like attempts to reform current methods of imprisonment, sustainability programming is an extension of the neoliberalization of incarceration in the United States. By emphasizing cost cutting while individualizing rehabilitation, prisons mobilize sustainability programming to produce “green prisoners” who are willing to take responsibility for their rehabilitation and diminish their economically burdensome behaviors (i.e. excessive wastefulness). Using semi-structure journals and interviews at three Oregon prisons, this paper investigates these ideas through the lens of the Sustainability in Prisons Project.

scholarly journals QoE-Oriented Mobile Edge Service Management Leveraging SDN and NFV

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Shuping Peng ◽  
Jose Oscar Fajardo ◽  
Pouria Sayyad Khodashenas ◽  
Begoña Blanco ◽  
Fidel Liberal ◽  
...  
Keyword(s):  
Service Management ◽  
Mobile Network ◽  
Cost Effective ◽  
Reference Architecture ◽  
Channel State ◽  
Performance Requirements ◽  
Promising Solution ◽  
Effective Network ◽  
Lifecycle Management

5G envisages a “hyperconnected society” where trillions of diverse entities could communicate with each other anywhere and at any time, some of which will demand extremely challenging performance requirements such as submillisecond low latency. Mobile Edge Computing (MEC) concept where application computing resources are deployed at the edge of the mobile network in proximity of an end user is a promising solution to improve quality of online experience. To make MEC more flexible and cost-effective Network Functions Virtualisation (NFV) and Software-Defined Networking (SDN) technologies are widely adopted. It leads to significant CAPEX and OPEX reduction with the help of a joint radio-cloud management and orchestration logic. In this paper we discuss and develop a reference architecture for the orchestration and management of the MEC ecosystem. Along with the lifecycle management flows of MEC services, indicating the interactions among the functional modules inside the Orchestrator and with external elements, QoS management with a focus on the channel state information technique is presented.

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