Artificial light at night (ALAN) affects biodiversity conservation through its impacts on spatio-temporal distribution patterns of species, in particular bat species. The development this threat underlines the urgency to adopt lighting practices (characteristics) that have least impact most vulnerable species still present semi-natural areas. It is therefore crucial better assess relative effec...

Literature has occasionally reported acute effects of office illuminance on cognitive performance during daytime. The current study was conducted to systematically investigate whether the type task and level difficulty moderate effect daytime functioning. Thirty healthy participants were assigned high (∼1036 lux at eye level; melanopic EDI = 904 lux) vs. low (∼108 level, 87 (at 6500 K) working ...

This paper presents a novel approach for real time face detection using heterogeneous computing. The algorithm uses local binary pattern (LBP) as feature vector for face detection. OpenCL is used to accelerate the code using GPU[1]. Illuminance invariance is achieved using gamma correction and Difference of Gaussian(DOG) to make the algorithm robust against varying lighting conditions. This imp...

This paper offers a novel algorithm to better design LEDs arrays for illumination systems. First, the illuminance distribution of LED arrays is studied through theoretical analysis. Second, we present the algorithm criterion and steps. And finally, we use computer to simulate and verify this method. The results show that the illumination uniformity is significantly affected by the spacing of ea...

Theoretical and practical concerns guided the design of an experiment on how ventilation noise (38 and 58 dBA), air temperature (21 and 278C), and illuminance (300 and 1500 lx) combine or interact in their e¡ects on cognitive performance. Self-reports of a¡ective states were taken with an a¡ect circumplex measure (Larsen & Diener, 1992; Knez & Hygge, in press) to study the mediation from the en...