A dimensionality reduction method to select the most representative daylight illuminance distributions

Kent, Michael; Schiavon, Stefano; Jakubiec, J. Alstan

doi:10.1080/19401493.2019.1711456

Cited by 14 publications

(10 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Any departure from perpendicularity reduces the effective collection area, leading to decreased light intake and potential losses, as light may escape the system. This consideration becomes particularly important when factoring in the varying position of the light source [29][30][31][32][33][34][35][36]. These findings indicate a common decrease in illuminance at the upper and lower termini of both types of tubes in response to an increase in the incident elevation angle of the light source.…”

Section: Resultsmentioning

confidence: 96%

“…At each position, the internal illuminance values gradually decreased as the angle of the incoming light increased from 0 • to 90 • . The uniformity of illuminance distribution at the bottom end positions of the aluminum alloy hollow light pipe was assessed using two key ratios: "min to max" and "min to average" illuminances [31]. The "min to max" ratio, which is close to 1, signifies minimal variation in lighting levels, with the lowest illuminance nearly equal to the highest illuminance, ensuring uniform lighting distribution.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings

Thongtha,

Laphom,

Mahawan

2023

Energies

View full text Add to dashboard Cite

This study investigates the properties of light transmission and distribution, examining how incident light angles impact illuminance distribution and daylight factor. Light tubes are acknowledged as promising tools to enhance lighting conditions and reduce energy consumption in building design. The study involved installing horizontal hollow light tubes, each measuring 0.5 m in length and 0.30 m in diameter, on a wooden test model. A 20-watt LED lamp was employed as the light source, and an illuminance meter recorded the values at various horizontal and elevation angles. The study’s assessment included calculating the average illuminance and daylight factor to obtain light transmission efficiency and energy-saving potential. The findings revealed that both aluminum alloy and zinc alloy tubes experienced a decrease in illuminance as incident elevation angles increased, with the most effective light transmission occurring at a horizontal angle of 90°. Notably, the aluminum alloy tube outperformed the zinc alloy tube, demonstrating more than a 15% increase in light transmission efficiency. Furthermore, the daylight factor values from both types of tubes aligned with established standards for residential and office activities, underscoring their potential as energy-efficient lighting solutions for spaces lacking natural light or with limited illumination.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings

Thongtha,

Laphom,

Mahawan

2023

Energies

View full text Add to dashboard Cite

show abstract

“…Principal component analysis was performed for each index, with the soil and root traits as explanatory variables (Figure 8). The x-and y-axes represent the unit-less eigenvectors, elucidating the magnitude of variance explained in a certain direction by the principal components, irrespective of their positive or negative values [45,46]. The first two principal components explained 68.0% of the variation in the data.…”

Section: Analysis Of Soil Water Distributionmentioning

confidence: 99%

The Impact of Vegetation Types on Soil Hydrological and Mechanical Properties in the Hilly Regions of Southern China: A Comparative Analysis

Zheng,

Wang,

Chen

et al. 2024

Water

View full text Add to dashboard Cite

Background: Vegetation roots are considered to play an effective role in controlling soil erosion by benefiting soil hydrology and mechanical properties. However, the correlation between soil hydrology and the mechanical features associated with the variation root system under different vegetation types remains poorly understood. Methods: We conducted dye-tracer infiltration to classify water flow behavior and indoor experiments (including tests on soil bulk density, soil organic carbon, mean weight diameter, soil cohesion, root density, etc.) to interpret variation patterns in three forest systems (coniferous and broad-leaved mixed forest, CBF; coniferous forest, CF; Phyllostachys edulis, PF) and fallow land (FL). Results: Based on the soil dye-tracer infiltration results, the largest dyeing area was observed in CF (36.96%), but CF also had the lowest infiltration rate (60.3 mm·min−1). The soil under CBF had the highest shear strength, approximately 25% higher than other vegetation types. CF exhibited the highest aggregate stability, surpassing CBF by 98.55%, PF by 34.31%, and FL by 407.41%, respectively. Additionally, PF forests showed the greatest root biomass and length. The results of correlation analysis and PCA reveal complex relationships among hydrological and mechanical soil traits. Specifically, soil cohesion does not exhibit significant correlations with hydrological traits such as the dyeing area, while traits like MWD and PAD show either positive or negative associations with hydrological traits. Root traits generally exhibit positive relationships with soil mechanical traits, with limited significant correlations observed with hydrological traits. Conversely, we found that root biomass contributes significantly to the dyeing area (accounting for 51.48%). Conclusions: Our findings indicate that the reforestation system is a successful approach for conserving water and reducing erosion by increasing soil-aggregated stability and shear strength, causing water redistribution to be more homogenized across the whole soil profile.

show abstract

“…Lee et al [17] showed that configurations of single light source directions exist that are effective for face recognition. Kent et al [18] used principal component analysis to find the most representative spatial daylight distribution patterns. Savelonas et al [19] provided an overview of computational methods aiding geoscientists in the analysis of 2D or 3D imaging data.…”

Section: Facial Pose Transfermentioning

confidence: 99%

Facial Pose and Expression Transfer Based on Classification Features

et al. 2023

View full text Add to dashboard Cite

Transferring facial pose and expression features from one face to another is a challenging problem and an interesting topic in pattern recognition, but is one of great importance with many applications. However, existing models usually learn to transfer pose and expression features with classification labels, which cannot hold all the differences in shape and size between conditional faces and source faces. To solve this problem, we propose a generative adversarial network model based on classification features for facial pose and facial expression transfer. We constructed a two-stage classifier to capture the high-dimensional classification features for each face first. Then, the proposed generation model attempts to transfer pose and expression features with classification features. In addition, we successfully combined two cost functions with different convergence speeds to learn pose and expression features. Compared to state-of-the-art models, the proposed model achieved leading scores for facial pose and expression transfer on two datasets.

show abstract

A dimensionality reduction method to select the most representative daylight illuminance distributions

Cited by 14 publications

References 51 publications

Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings

Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings

The Impact of Vegetation Types on Soil Hydrological and Mechanical Properties in the Hilly Regions of Southern China: A Comparative Analysis

Facial Pose and Expression Transfer Based on Classification Features

Contact Info

Product

Resources

About