scholarly journals Human Centric Lighting: The impact of light on sleep and attention of factory shift workers

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
S Kindt ◽  
E Van de Putte ◽  
P Bracke ◽  
L Vandevivere ◽  
W Ryckaert
Keyword(s):  
Visual Comfort ◽  
Attention Task ◽  
Shift Workers ◽  
Lighting Condition ◽  
Lighting Conditions ◽  
Before And After ◽  
Illuminance Level ◽  
Sleep And Cognition ◽  
The Impact ◽  
Morning Shift

Abstract Introduction Increased blue-enriched morning light is often said to support circadian rhythm synchronization. Through a better sleep quality, one's cognitive and emotional functioning can also be enhanced. However, it is unclear which light characteristics (especially illuminance at eye level) are necessary to obtain a wellbeing effect in employees. This field study investigated different lighting conditions in a truck factory. Methods 71 shift workers participated in the study during their morning shift (6 am - 2 pm). Measurements of sleep (MotionWatch8), attention (D2 attention task, go no-go computer task) and visual comfort (questionnaire) were administered before and after changing the lighting conditions. A Human Centric Lighting-condition (HCL; vertical melanopic equivalent daylight illuminance (MEDI) = 250 lux, CCT=5000 K; N = 33) was compared with a control LED-condition (MEDI = 44 lux, CCT=4000K; N = 38). Results Results show that workers in the HCL-condition showed a larger improvement in sleep efficiency (p=.057) and concentration (p=.01) than the control LED-group. No differences were found in visual comfort between groups. Discussion Preliminary results are promising and show that 250 MEDI might be a sufficient cut-off to stimulate workers' sleep and cognition. The high illuminance level was not detrimental in the HCL condition for the perceived visual comfort. Key messages Blue-enriched morning light supports sleep and concentration in shift workers. High illuminance levels are not detrimental for the perceived visual comfort.

scholarly journals Case Study on the Impact of Artificial Light on Lighting Performance Quality for Architecture Studios

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
N. A. Adnan ◽  
◽  
N. S. Sujali ◽  
N. D. Md Amin ◽  
◽  
...  
Keyword(s):  
Learning Experience ◽  
Comfort Level ◽  
Learning Space ◽  
Lighting Condition ◽  
Performance Quality ◽  
Engineering Society ◽  
Illuminance Level ◽  
The Impact ◽  
The City

A well-lit learning space is crucial to ensure the comfort of its occupants, especially for an architecture student who spends long hours in a studio to design, sketch, draw and build prototypes. This paper presents the results from a study conducted on the illuminance level of the architecture studios in the city campus of Universiti Tun Hussein Onn Malaysia (UTHM), Malaysia that were once laboratories. Measurements had been done using the Lux meter. Illuminance contours were generated using SigmaPlot and Dialux software for all the five rooms and compared with the requirements stipulated in the Malaysian Standard, Australia/New Zealand Standard and Illumination Engineering Society of North America (IESNA) standard for a room with similar function. A survey was also conducted among undergraduate architecture students who were using the studios daily to gauge their perception on the lighting condition and comfort level. The outcome of this study can be considered for future architecture studio lighting design to improve the students’ learning experience.

scholarly journals Influence of Image Quality and Light Consistency on the Performance of Convolutional Neural Networks for Weed Mapping

2021 ◽  
Vol 13 (11) ◽  
pp. 2140
Author(s):  
Chengsong Hu ◽  
Bishwa B. Sapkota ◽  
J. Alex Thomasson ◽  
Muthukumar V. Bagavathiannan
Keyword(s):  
Neural Networks ◽  
Image Quality ◽  
Convolutional Neural Networks ◽  
Motion Blur ◽  
Lighting Condition ◽  
Weed Mapping ◽  
Lighting Conditions ◽  
Performance Reduction ◽  
Gaussian Blur ◽  
The Impact

Recent computer vision techniques based on convolutional neural networks (CNNs) are considered state-of-the-art tools in weed mapping. However, their performance has been shown to be sensitive to image quality degradation. Variation in lighting conditions adds another level of complexity to weed mapping. We focus on determining the influence of image quality and light consistency on the performance of CNNs in weed mapping by simulating the image formation pipeline. Faster Region-based CNN (R-CNN) and Mask R-CNN were used as CNN examples for object detection and instance segmentation, respectively, while semantic segmentation was represented by Deeplab-v3. The degradations simulated in this study included resolution reduction, overexposure, Gaussian blur, motion blur, and noise. The results showed that the CNN performance was most impacted by resolution, regardless of plant size. When the training and testing images had the same quality, Faster R-CNN and Mask R-CNN were moderately tolerant to low levels of overexposure, Gaussian blur, motion blur, and noise. Deeplab-v3, on the other hand, tolerated overexposure, motion blur, and noise at all tested levels. In most cases, quality inconsistency between the training and testing images reduced CNN performance. However, CNN models trained on low-quality images were more tolerant against quality inconsistency than those trained by high-quality images. Light inconsistency also reduced CNN performance. Increasing the diversity of lighting conditions in the training images may alleviate the performance reduction but does not provide the same benefit from the number increase of images with the same lighting condition. These results provide insights into the impact of image quality and light consistency on CNN performance. The quality threshold established in this study can be used to guide the selection of camera parameters in future weed mapping applications.

Modelling incomplete chromatic adaptation on a display under different ambient illuminations

2019 ◽  
Vol 2019 (1) ◽  
pp. 231-236
Author(s):  
Rui Peng ◽  
Ming Ronnier Luo ◽  
Mingkai Cao
Keyword(s):  
Lower Degree ◽  
Chromatic Adaptation ◽  
White Background ◽  
Color Stimulus ◽  
Lighting Condition ◽  
Lighting Conditions ◽  
Ambient Lighting ◽  
Illuminance Level ◽  
Adaptation Factor

The purposes of this study was to investigate the chromatic adaptation and adaptive whites on a display under various ambient lighting conditions with different chromaticity and illuminance. An image including black text and white background was rendered by means of the CAT02 chromatic adaptation transform, into 42 different white stimuli varying at 6 CCTs and 7 Duv levels. Twenty observers assessed the neutral white evaluations of each color stimulus via psychophysical experiments. The optimization based on the neutral white stimulus under each ambient lighting condition suggested a lower degree of chromatic adaptation under the conditions with a lower CCT and a lower illuminance level. The results were used to model the adaptive display white and the incomplete adaptation factor (D) for CAT02 under different ambient illumiantions.

scholarly journals Impacts of Dynamic LED Lighting on the Well-Being and Experience of Office Occupants

2020 ◽  
Vol 17 (19) ◽  
pp. 7217 ◽  
Author(s):  
Rongpeng Zhang ◽  
Carolina Campanella ◽  
Sara Aristizabal ◽  
Anja Jamrozik ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Psychological Functioning ◽  
Mental Stress ◽  
Critical Factor ◽  
Well Being ◽  
Color Temperature ◽  
Visual Comfort ◽  
Lighting Conditions ◽  
Visual Impacts ◽  
The Impact ◽  
Dynamic Lighting

As a critical factor in the built environment, lighting presents considerable influence on occupants. Previous research across static lighting conditions has found that both illuminance and correlated color temperature (CCT) affect occupants’ physiological and psychological functioning. However, little research has been conducted on the non-visual impacts of dynamic lighting with daily variation in illuminance and CCT levels. The purpose of this study is to better understand the impact of dynamic lighting on office occupants’ health, well-being and experience at a living lab. Fifteen participants were recruited to work in three office modules for four months. Four lighting conditions were designed and implemented in this study, including two static lighting conditions and two dynamic lighting conditions with a specific predefined control scheme. A prototype lighting system with enhanced control capabilities was configured and implemented to ensure the desired lighting environment protocol. Both objective methods and subjective surveys were used to assess the behavioral and physiological outcomes of interest, including mental stress, sleep, productivity, satisfaction, mood, visual comfort and perceived naturalness. The results showed that the daytime behavioral impacts were either positive or mixed. Specifically, a significant alertness increase was observed in the afternoon, indicating a potential solution to reduce the natural feelings of sleepiness during the workday. There was also a marginal benefit for mood. The nighttime impacts include a significant decrease in perceived sleep quality and sleep time after subjects were exposed to dynamic lighting. No significant differences were observed for mental stress, productivity, visual comfort, or perceived naturalness. The findings present additional insights into the non-visual impacts of dynamic lighting and give recommendations for further investigations.

scholarly journals Maximum Luminances and Luminance Ratios and their Impact on Users' Discomfort Glare Perception and Productivity in Daylit Offices:  Testing the Hypothesis: Maximum Luminance and Ratio Recommendations For Visual Comfort Should be Specific to the Luminous Conditions and by Accounting For the Impact of Adaptation, the Recommendations Will be More Accurate.

2021 ◽  
Author(s):  
◽  
Andrew Scott Linney
Keyword(s):  
Health And Safety ◽  
Past Century ◽  
Visual Comfort ◽  
User Characteristics ◽  
Office Environment ◽  
Lighting Conditions ◽  
Subjective Assessments ◽  
Discomfort Glare ◽  
The Impact ◽  
At Will

<p>Lighting is an important environmental factor when considering health and safety, visual comfort and workplace design. But how well do we really understand the implications of lighting on these factors, especially in a workplace environment? When one attempts to digest the enormous volume of information of the past century regarding recommended lighting conditions, one begins to see that these recommendations are varied, not extensively tested and often apply to a very limited set of luminous conditions. In a world with daylighting design which increasingly challenges creative and technological boundaries, it is important that the factors and limits which contribute to visual comfort are well understood in order to test these new designs. Daylighting design also becomes important simply from a sustainability standpoint with energy efficiency becoming increasingly important in this age of diminishing natural resources. With an increase in the amount of daylight in buildings spawning from this desire to capitalize on the free and daily renewable light from the sun, difficult and often immeasurable factors such as a view of the outdoors and higher adaptation levels of space users' eyes could very realistically affect the current limits of the human visual system for visual comfort. Visual comfort, limits, which at best are ball park figures, loosely understood and rarely adhered to. This paper documents the testing of 48 test subjects, all of an age where they could feasibly be expected to work in an office environment, in a simulated contemporary office environment with a simulated daylighting window where the luminous conditions and layout were altered to assess the impact of such changes on visual comfort, productivity and different types of user characteristics. The window is designed so luminances of the window can be changed at will. By comparing subjective assessments of the lighting conditions with test performances, a greater understanding of the luminance limits (maximums and ratios) of the human eye for different contemporary lighting layouts within working-aged populations can be defined. With improved understanding of human tolerances to luminance distributions and lighting conditions which romote visual comfort and productivity, designers can begin to give glare prediction with respect to likely effects on these factors. This information would be highly valuable to office based firms who are currently building new or retrofitting premises (to the point where they would likely pay for it as an investment for future efficiency of their firms) thereby proving beneficial to demand for skilled architects, interior and lighting designers. In comparison to the relatively more complicated glare prediction indices involving various factors and calculations, luminance ratio recommendations are an easy to understand tool which with further study could become a powerful method of site and even user-specific glare prediction in the future.</p>

scholarly journals Maximum Luminances and Luminance Ratios and their Impact on Users' Discomfort Glare Perception and Productivity in Daylit Offices:  Testing the Hypothesis: Maximum Luminance and Ratio Recommendations For Visual Comfort Should be Specific to the Luminous Conditions and by Accounting For the Impact of Adaptation, the Recommendations Will be More Accurate.

2021 ◽  
Author(s):  
◽  
Andrew Scott Linney
Keyword(s):  
Health And Safety ◽  
Past Century ◽  
Visual Comfort ◽  
User Characteristics ◽  
Office Environment ◽  
Lighting Conditions ◽  
Subjective Assessments ◽  
Discomfort Glare ◽  
The Impact ◽  
At Will

<p>Lighting is an important environmental factor when considering health and safety, visual comfort and workplace design. But how well do we really understand the implications of lighting on these factors, especially in a workplace environment? When one attempts to digest the enormous volume of information of the past century regarding recommended lighting conditions, one begins to see that these recommendations are varied, not extensively tested and often apply to a very limited set of luminous conditions. In a world with daylighting design which increasingly challenges creative and technological boundaries, it is important that the factors and limits which contribute to visual comfort are well understood in order to test these new designs. Daylighting design also becomes important simply from a sustainability standpoint with energy efficiency becoming increasingly important in this age of diminishing natural resources. With an increase in the amount of daylight in buildings spawning from this desire to capitalize on the free and daily renewable light from the sun, difficult and often immeasurable factors such as a view of the outdoors and higher adaptation levels of space users' eyes could very realistically affect the current limits of the human visual system for visual comfort. Visual comfort, limits, which at best are ball park figures, loosely understood and rarely adhered to. This paper documents the testing of 48 test subjects, all of an age where they could feasibly be expected to work in an office environment, in a simulated contemporary office environment with a simulated daylighting window where the luminous conditions and layout were altered to assess the impact of such changes on visual comfort, productivity and different types of user characteristics. The window is designed so luminances of the window can be changed at will. By comparing subjective assessments of the lighting conditions with test performances, a greater understanding of the luminance limits (maximums and ratios) of the human eye for different contemporary lighting layouts within working-aged populations can be defined. With improved understanding of human tolerances to luminance distributions and lighting conditions which romote visual comfort and productivity, designers can begin to give glare prediction with respect to likely effects on these factors. This information would be highly valuable to office based firms who are currently building new or retrofitting premises (to the point where they would likely pay for it as an investment for future efficiency of their firms) thereby proving beneficial to demand for skilled architects, interior and lighting designers. In comparison to the relatively more complicated glare prediction indices involving various factors and calculations, luminance ratio recommendations are an easy to understand tool which with further study could become a powerful method of site and even user-specific glare prediction in the future.</p>

Strategic Role of Zakat in Multidimensional Quality of Life in Sijunjung, Indonesia

2018 ◽  
Vol 15 (1) ◽  
pp. 55-72
Author(s):  
Herlin Hamimi ◽  
Abdul Ghafar Ismail ◽  
Muhammad Hasbi Zaenal
Keyword(s):  
Quality Of Life ◽  
Positive Impact ◽  
Wealth Distribution ◽  
Absolute Poverty ◽  
Before And After ◽  
The Status ◽  
Being There ◽  
The Impact

Zakat is one of the five pillars of Islam which has a function of faith, social and economic functions. Muslims who can pay zakat are required to give at least 2.5 per cent of their wealth. The problem of poverty prevalent in disadvantaged regions because of the difficulty of access to information and communication led to a gap that is so high in wealth and resources. The instrument of zakat provides a paradigm in the achievement of equitable wealth distribution and healthy circulation. Zakat potentially offers a better life and improves the quality of human being. There is a human quality improvement not only in economic terms but also in spiritual terms such as improving religiousity. This study aims to examine the role of zakat to alleviate humanitarian issues in disadvantaged regions such as Sijunjung, one of zakat beneficiaries and impoverished areas in Indonesia. The researcher attempted a Cibest method to capture the impact of zakat beneficiaries before and after becoming a member of Zakat Community Development (ZCD) Program in material and spiritual value. The overall analysis shows that zakat has a positive impact on disadvantaged regions development and enhance the quality of life of the community. There is an improvement in the average of mustahik household incomes after becoming a member of ZCD Program. Cibest model demonstrates that material, spiritual, and absolute poverty index decreased by 10, 5, and 6 per cent. Meanwhile, the welfare index is increased by 21 per cent. These findings have significant implications for developing the quality of life in disadvantaged regions in Sijunjung. Therefore, zakat is one of the instruments to change the status of disadvantaged areas to be equivalent to other areas.

ANALISIS PENGARUH PEMBANGUNAN JALAN LAYANG JANTI TERHADAP PERKEMBANGAN TATA RUANG KAWASAN JANTI STUDI KASUS : KAWASAN JANTI, DESA CATURTUNGGAL, KABUPATEN SLEMAN, D. I. YOGYAKARTA

2017 ◽  
Vol 11 (3) ◽  
pp. 255
Author(s):  
Jeky El Boru
Keyword(s):  
Road Network ◽  
Open Space ◽  
Qualitative Description ◽  
Analysis Method ◽  
Open Spaces ◽  
The Road ◽  
Before And After ◽  
Linkage Method ◽  
The Impact ◽  
Parking Place

Abstract: This research aims to analyze the impact of Janti Flyover Construction toward the growth of layout at Janti Urban Area, including structured space, open space, and linkage. Method used for data collecting are observation, air photograph monitoring, and interview, whereas the analysis method is qualitative description, which is the superimposed method of two layers, that are the layout condition before and after flyover construction. The result shows that the impact of Janti Flyover construction can be seen on building mass (solid), the increasing number of open spaces, including the road network, parking place, and park, whereas the relation between spaces, visually and structurally, can be seen on the growth of buildings which have new shapes and styles, therefore the performance of the overall building does not have a proportional shape. Considering Janti Street at the collective relation, its role is getting stronger as the main frame road network.Keywords: Flyover construction, layout changing, Janti AreaAbstrak: Penelitian ini bertujuan untuk menganalisis pengaruh pembangunan Jalan Layang Janti terhadap perkembangan tata ruang Kawasan Janti, meliputi ruang terbangun, ruang terbuka, serta hubungan antar ruang (“linkage”). Metode pengumpulan data dilakukan melalui observasi, pengamatan foto udara, dan wawancara; sedangkan metode analisis melalui deskripsi secara kualitatif yang berupa “superimposed method” dari dua lapisan kondisi lahan, yakni kondisi tata ruang sebelum dan sesudah pembangunan jalan layang. Hasil penelitian menunjukkan bahwa pengaruh pembangunan Jalan Layang Janti terdapat pada massa bangunan (“solid”), pertambahan ruang terbuka yang berupa jaringan jalan, parkir, dan taman; sedangkan pada hubungan antar ruang ̶ secara visual dan struktural ̶ yakni tumbuhnya bangunan dengan bentuk dan gaya baru, sehingga bentuk tampilan bangunan secara keseluruhan tidak proporsional. Pada hubungan kolektif, Jalan Janti semakin kuat perannya sebagai kerangka utama jaringan jalan.Kata kunci : Pembangunan jalan layang, tata ruang, Kawasan Janti

Impact of merger on efficiency and productivity : a case study of commercial banks in Malaysia

1970 ◽  
Vol 5 (1) ◽  
pp. 77
Author(s):  
Mahadzir Ismail ◽  
Saliza Sulaiman ◽  
Hasni Abdul Rahim ◽  
Nordiana Nordin
Keyword(s):  
Efficiency Score ◽  
Malmquist Productivity Index ◽  
Productivity Index ◽  
Data Envelopment ◽  
Master Plan ◽  
Before And After ◽  
Domestic Banks ◽  
The Impact ◽  
Efficiency And Productivity

The Financial Master Plan (2001- 2010) aims to enhance the capacity of banking industry so that higher effic iency and productivity can be reaped in the future. This study seeks to determine the impact of merger on the efficiency and productivity ofcommercial banks in Malaysia for the period 1995 until 2005. The study uses a non-parametric approach, nam ely DEA (data envelopment analysis?) to estimate the efficiency scores and to construct the Malmquist productivity index. To enable this estimation, three bank inputs and outputs are used. Amongst the findings are those banks exhibit higher efficiency score after the merger and thefo reign banks are more efficient than the local banks. Productivity of the banks is calculated in both periods, before and after the merger: The results show that, it is the local banks that have improved the most after the merger. The main source of productivity is technical change or innovation. The findings support the existing policy of having larger domestic banks in term of size.

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