High-speed optical camera communication using CMOS-driven micro-LED projector

We demonstrate a 7.76-Mb/s optical camera communication system using a CMOS-driven micro-LED projector and a high-speed camera. PAM4 signal was transmitted based on the imaging multiple-input-multiple-output system. The results predict a potential data rate of over 1 Gb/s using the full micro-LED projector chip

Spiritually-Oriented Cognitive Therapy in Reduction of Depression Symptoms in Mothers of Children with Cancer

Objectives: Some of the mothers of children with cancer suffer from reactive depression and confront existential crises, and benefit from their image of God in coping with it. The purpose of this study was to determine the effectiveness of spiritually-oriented cognitive therapy on reducing depression symptoms in mothers of children with cancer. Methods: A single case experimental design and an A-B form were used in this study. The participants were selected through purposeful sampling. We studied three of the mothers of children who had been admitted to the pediatric ward of ‘Mofid Pediatric Hospital’. These children were aged under 12years they suffered from any kind of cancer except brain tumor cancer had not metastasized to other parts of the body the mothers themselves had no history of psychiatric illness prior to their child’s illness, and had mild to moderate depression at the time of screening. These mothers were subjected to spirituallyoriented cognitive therapy for 10 individual sessions, 90 minutes per week. The depression grade and the changes were measured with Beck Depression Inventory (BDI-II). Results: Comparing the mothers’ scores through 8 times of completing the inventory (three at baseline, three during the therapy and two follow-ups), and calculating the percent of recovery showed a decrease in depression scores. Discussion: It seems that spiritually-oriented cognitive therapy can enhance the spiritual experience and reduce depression in cognitive and existential contexts

Ultra-high frame rate digital light projector using chip-scale LED-on-CMOS technology

Digital light projector systems are crucial components in applications including computational imaging, fluorescence microscopy and highly parallel data communications. Current technology based on Digital Micro-mirror Displays are limited to absolute frame rates in the few tens of kilo-frames per second and require the use of external light sources and coupling optics. Furthermore, to realize grayscale pixel values using duty cycle control, frame-rates are reduced proportionally to the number of gray levels required. Here we present a self-emissive chip-scale projector system based on micro-LED pixels directly bonded to a smart pixel CMOS drive chip. The 128×128 pixel array can project binary patterns at up to 0.5 Mfps and toggle between two stored frames at MHz rates. The projector has a 5-bit grayscale resolution that can be updated at up to 83 kfps, and can be held in memory as a constant bias for the binary pattern projection. Additionally, the projector can be operated in a pulsed mode, with individual pixels emitting pulses down to a few nanoseconds in duration. Again, this mode can be used in conjunction with the high-speed spatial pattern projection. As a demonstration of the data throughput achievable with this system we present an optical camera communications application, exhibiting data rates of >5 Gbps