A Domain Model-Centric Approach for the Development of Large-Scale Office Lighting Systems

2018 ◽  
pp. 109-120
Author(s):  
Richard Doornbos ◽  
Bas Huijbrechts ◽  
Jack Sleuters ◽  
Jacques Verriet ◽  
Kristina Ševo ◽  
...  
Keyword(s):  
Large Scale ◽  
Domain Model ◽  
Lighting Systems ◽  
Office Lighting

scholarly journals Towards the Optimum Light Source Spectrum

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Andrew Chalmers ◽  
Snjezana Soltic
Keyword(s):  
Light Source ◽  
Large Scale ◽  
Source Spectrum ◽  
Light Sources ◽  
Luminous Efficacy ◽  
Light Emitting ◽  
Spectral Bands ◽  
Good Energy ◽  
Lighting Systems ◽  
Colour Rendering

This paper is concerned with designing light source spectra for optimum luminous efficacy and colour rendering. We demonstrate that it is possible to design light sources that can provide both good colour rendering and high luminous efficacy by combining the outputs of a number of narrowband spectral constituents. Also, the achievable results depend on the numbers and wavelengths of the different spectral bands utilized in the mixture. Practical realization of these concepts has been demonstrated in this pilot study which combines a number of simulations with tests using real LEDs (light emitting diodes). Such sources are capable of providing highly efficient lighting systems with good energy conservation potential. Further research is underway to investigate the practicalities of our proposals in relation to large-scale light source production.

scholarly journals A massively scalable distributed multigrid framework for nonlinear marine hydrodynamics

2019 ◽  
Vol 33 (5) ◽  
pp. 855-868 ◽  
Author(s):  
Stefan Lemvig Glimberg ◽  
Allan Peter Engsig-Karup ◽  
Luke N Olson
Keyword(s):  
Potential Flow ◽  
Large Scale ◽  
Data Locality ◽  
High Order ◽  
Domain Model ◽  
Processing Unit ◽  
Parallel Scalability ◽  
Marine Hydrodynamics ◽  
Practical Applications ◽  
Oak Ridge

The focus of this article is on the parallel scalability of a distributed multigrid framework, known as the DTU Compute GPUlab Library, for execution on graphics processing unit (GPU)-accelerated supercomputers. We demonstrate near-ideal weak scalability for a high-order fully nonlinear potential flow (FNPF) time domain model on the Oak Ridge Titan supercomputer, which is equipped with a large number of many-core CPU-GPU nodes. The high-order finite difference scheme for the solver is implemented to expose data locality and scalability, and the linear Laplace solver is based on an iterative multilevel preconditioned defect correction method designed for high-throughput processing and massive parallelism. In this work, the FNPF discretization is based on a multi-block discretization that allows for large-scale simulations. In this setup, each grid block is based on a logically structured mesh with support for curvilinear representation of horizontal block boundaries to allow for an accurate representation of geometric features such as surface-piercing bottom-mounted structures—for example, mono-pile foundations as demonstrated. Unprecedented performance and scalability results are presented for a system of equations that is historically known as being too expensive to solve in practical applications. A novel feature of the potential flow model is demonstrated, being that a modest number of multigrid restrictions is sufficient for fast convergence, improving overall parallel scalability as the coarse grid problem diminishes. In the numerical benchmarks presented, we demonstrate using 8192 modern Nvidia GPUs enabling large-scale and high-resolution nonlinear marine hydrodynamics applications.

scholarly journals LED Lighting in Horticulture

HortScience ◽  
2008 ◽  
Vol 43 (7) ◽  
pp. 1947-1950 ◽  
Author(s):  
Robert C. Morrow
Keyword(s):  
Solid State ◽  
Large Scale ◽  
Space Shuttle ◽  
Space Station ◽  
Spectral Composition ◽  
Light Output ◽  
Plant Morphology ◽  
Heat Output ◽  
Led Lighting ◽  
Lighting Systems

Solid-state lighting based on the use of light-emitting diodes (LEDs) is potentially one of the biggest advancements in horticultural lighting in decades. LEDs can play a variety of roles in horticultural lighting, including use in controlled environment research, lighting for tissue culture, and supplemental and photoperiod lighting for greenhouses. LED lighting systems have several unique advantages over existing horticultural lighting, including the ability to control spectral composition, the ability to produce very high light levels with low radiant heat output when cooled properly, and the ability to maintain useful light output for years without replacement. LEDs are the first light source to have the capability of true spectral composition control, allowing wavelengths to be matched to plant photoreceptors to provide more optimal production and to influence plant morphology and composition. Because they are solid-state devices, LEDs are easily integrated into digital control systems, facilitating special lighting programs such as “daily light integral” lighting and sunrise and sunset simulations. LEDs are safer to operate than current lamps because they do not have glass envelopes or high touch temperatures, and they do not contain mercury. The first sustained work with LEDs as a source of plant lighting occurred in the mid-1980s to support the development of new lighting systems to be used in plant growth systems designed for research on the space shuttle and space station. These systems progressed from simple red-only LED arrays using the limited components available at the time to high-density, multicolor LED chip-on-board devices. As light output increases while device costs decrease, LEDs continue to move toward becoming economically feasible for even large-scale horticultural lighting applications.

scholarly journals FARUL3S: a New Framework for Agile Regulated Ultra-Large-Scale Software Systems

2021 ◽  
Author(s):  
Amira KSIKSI
Keyword(s):  
System Design ◽  
Smart City ◽  
Large Scale ◽  
Complex Adaptive System ◽  
Systems Design ◽  
Domain Model ◽  
Design Rule ◽  
Software Systems ◽  
Management And Development ◽  
Complex Adaptive

<div>The Ultra-Large-Scale Software (ULSS) systems development challenges today’s software management and development approaches. Northrop et al. (2006) revealed three broad areas of challenges [1]. To deal with those challenges, they propose an interdisciplinary portfolio of research. In particular, we address the design and evolution challenge by focusing on the design area of research. In order to regulate the ULSS systems, the traditional software engineering tools face challenges as they are top-down so they deal with each domain model separately. To address the domain diversity like in the smart city systems, we propose the Framework for Agile Regulated Ultra Large Scale Software System (FARUL3S) to look at the ULSS system from bottom-up. The FARUL3S is a user-centered solution that aims at combining the complex adaptive system, the financial economics as well as the engineering systems design. Our contribution aims to regulate and constrain the ULSS systems by using architectural agreements and other rules. In this paper, we provide a detailed description of the FARUL3S steps. Our Framework generates a system Design Rule Hierarchy (DRH) so it can be used to constrain the entire system design. In the future, we will provide an illustration of the FARUL3S adoption on the management and design of different smart city services to ensure the efficiency of our solution.</div>

scholarly journals Video Analysis of Pedestrian Movement (VAPM) under Different Lighting Conditions—Method Exploration

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4141
Author(s):  
Maria Johansson ◽  
Aliaksei Laureshyn ◽  
Mikael Nilsson
Keyword(s):  
Video Analysis ◽  
Smart City ◽  
Large Scale ◽  
Outdoor Environment ◽  
Energy Usage ◽  
Pedestrian Movement ◽  
Lighting Conditions ◽  
Methodological Triangulation ◽  
Lighting Systems ◽  
New City

When daylight hours are limited, pedestrians are dependent on appropriate outdoor lighting. Although new city lighting applications must consider both energy usage and pedestrian responses, current methods used to capture pedestrian walking behaviour during dark conditions in real settings are limited. This study reports on the development and evaluation of a video-based method that analyses pedestrians’ microscopic movements (VAPM—video analysis of pedestrian movements), including placement and speed, in an artificially lit outdoor environment. In a field study utilising between-subjects design, 62 pedestrians walked along the same path under two different lighting applications. VAPM accurately discriminated pedestrians’ microscopic movements in the two lighting applications. By incorporating methodological triangulation, VAPM successfully complemented observer-based assessments of pedestrians’ perceptions and evaluations of the two lighting applications. It is suggested that in evaluations of pedestrian responses to city lighting applications, observer-based assessments could be successfully combined with an analysis of actual pedestrian movement while walking in the lit environment. However, prior to employing a large-scale application of VAPM, the methodology needs to be further adapted for use with drones and integration into smart city lighting systems.

Two-Port Characteristic Analysis for Transformers with the Large Scale Windings Based on Sparse Matrix

2014 ◽  
Vol 986-987 ◽  
pp. 2035-2038
Author(s):  
Xu Dong Zhang ◽  
Jian Ye Yuan ◽  
Jing Ping Zhang ◽  
Jian Ying Feng
Keyword(s):  
Transmission Lines ◽  
Large Scale ◽  
Sparse Matrix ◽  
Domain Model ◽  
Computation Method ◽  
Characteristic Analysis ◽  
Matrix Operation ◽  
Large Matrix ◽  
Calculation Results ◽  
Block Storage

In order to calculate the two-port wide frequency parameters of a large transformer quickly and accurately, parameter calculation of multi-conductor transmission lines model is proposed based on the sparse matrix operation. It solved the problem caused by the large matrix. Firstly, multi-conductor transmission lines model of the transformer windings is established. Secondly, matrix characteristics ofYandZis analyzed, based on which the block storage and computation method is applied. Then the frequency-domain model is solved based on sparse matrix operation. At last, taking a SS11-20000/110 transformer as an example, the correctness of this method has been verified by comparing calculation results with measurement results.

A frequency domain model for analysing vibrations in large-scale integrated building–bridge structures induced by running trains

2019 ◽  
Vol 234 (2) ◽  
pp. 226-241 ◽  
Author(s):  
Xun Zhang ◽  
Linghui Ruan ◽  
Yu Zhao ◽  
Xiaogang Zhou ◽  
Xiaozhen Li
Keyword(s):  
Frequency Domain ◽  
High Speed ◽  
Large Scale ◽  
Computation Time ◽  
Domain Model ◽  
Vibration Source ◽  
Force Transmission ◽  
Train Track ◽  
Building Bridge ◽  
Bridge Structures

Integrated building–bridge structures are increasingly common in high-speed railway stations, where the elevated track floor is directly subjected to train–track dynamic forces that result in excessive vibrations. The common methods of predicting the train-induced vibrations in large-scale IBBS are implemented in the time domain and can have prohibitively long computation times. This paper presents a frequency domain model for the vibration analysis of large-scale IBBS, with the aim of reducing the computation time while retaining sufficient accuracy. The model consists of three coupled subsystems: train, track, and IBBS. The train and track subsystems are investigated analytically, and the IBBS subsystem is solved numerically using a finite element method. The receptance technique is introduced to obtain the wheel/rail force. The force transmitted to the floor slab is treated as the vibration source of the IBBS subsystem. The simulated vibration levels in the IBBS subsystem are compared with those obtained from in situ measurements, and a good agreement is observed in terms of both magnitude and frequency dependence. The vibration responses of the IBBS subsystem at different locations of the track floor and the waiting floor are compared, and the influence of the track position is investigated. Finally, a parametric analysis is conducted with the aim of formulating anti-vibration measures, in which the carbody acceleration, rail displacement, and ballast acceleration are considered as key indicators. The force transmission, vibration transmission and IBBS vibrations are also investigated. The results indicate that using a ballast mat and enlarging the column cross-section are the two most promising measures for reducing the vibration levels.

Synchronous Controller of LED Video Displays and LED Lighting Compatible

2011 ◽  
Vol 383-390 ◽  
pp. 6959-6963
Author(s):  
Jian She Sun ◽  
Xiao Ning Feng ◽  
Yi Fei Sun ◽  
Hui Zhao
Keyword(s):  
Control System ◽  
High Speed ◽  
Large Scale ◽  
Centralized Control ◽  
Fiber Communication ◽  
Protocol Conversion ◽  
Wide Range ◽  
Lighting Systems ◽  
Control Port ◽  
Control Distance

The development of a large display and can control a variety of compatible lighting control system, the system is suitable for wide range control distance. Can be widely used in modern college park, landscape building, business building and landscaping all buildings, publicity, service, advertising and other large screen and lighting systems. Using large-scale high-speed FPGA technology, Gigabit fiber communication technology, through a multi-level processing and protocol conversion, can be terminal for the different display mode (divided into static, 2 sweep, sweep 4, 8, sweep, sweep five kinds of 16), data in the order, alignment methods, control methods, the preparation of their own in the FPGA, the protocol conversion module, through the software are free to choose set the display terminal type, to achieve 16 control port can be controlled separately different types of display terminal. Control distance up to 5000 meters or more. Effectively address all the original control system can not be compatible, not centralized control, can not share resources and control of the key problems of distance is too short.

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