BACKGROUND Blue lights are sometimes placed in public washrooms to discourage injection drug use. Their effectiveness has been questioned and concerns raised that they are harmful but formal research on the issue is limited to a single study. We gathered perceptions of people who use injection drugs on the effects of blue lights with the aim of informing harm reduction practice. METHODS We in...

Because of the availability of high-resolution satellite imagery, remote sensing data has become an attractive source of data for identifying post-earthquake damage. Recently, several semiautomated methods for earthquake damage detection have been developed. These methodologies fall into two general categories: change detection and thematic classification. In change detection, both preand post-...

Object’s color information is not invariant information but is affected by surrounding environments including ambient lights. In this paper, we propsed a new method to acquire intrinsic color information without being affected by ambient lights. In our method, we use a projector as a light source, then capture multiple images with varied color of illumination. Combining these multiple images, w...

nowadays, because of the growing numbers of vehicles on streets and roads, the use of intelligent controlsystems to improve driving safety and health has become a necessity. to design and implement suchcontrol systems, having information about traffic light colors is essential. there are the wide variety oftraffic lights in terms of light intensity and color. therefore it seems that design and ...

The compellingness of the interaction between vision and auditory localization (the ventriloquist effect) was investigated using a discrimination task. A tone sequence was presented either from the same location or from two locations that alternated along the horizontal plane. In synchrony with the tones, lights were presented either at the same or at alternating locations. Subjects had to deci...

Virtual reality (VR) provides immersive and controllable experimental environments. It expands the bounds of possible evoked potential (EP) experiments by providing complex, dynamic environments in order to study cognition without sacrificing environmental control. VR also serves as a safe dynamic testbed for brain-computer .interface (BCl) research. However, there has been some concern about d...

The problem of illuminating a simple n-gon with cn, c < 1 πlights is open, whereas a lower bound of ⌊ 3 5 n⌋ is known. We provide an algorithm for placing π-lights, and experimental results that support the conjecture that ⌊ 3 5 n⌋ lights are also sufficient. We also prove that ⌊ 5 6 n⌋ π-lights suffice if some may be outward facing.