Quantum dot (QD) is a kind of semiconductor nanoparticle and shows photoluminescence, in which the light with narrow spectral band is emitted from the QD after the absorption of the excitation light. In this study, it is demonstrated that the LED-based light source combined with a QD film can be applied to spectral imaging. The polymer film with QD was prepared by photopolymerization. Through measurement of the emission spectrum, it was confirmed that the optical intensity at the peak wavelength of the spectral bands of 410 and 540 nm could be controlled by changing the thickness of the film. In the study using a home-made phantom mimicking blood vessels, the patterns’ contrast in the phantom images could be enhanced by using LED combined with QD as compared with the white light image. The LED light combined with the QD film provides a useful solution for illumination for spectral imaging.

In this article, in order to enhance the performance of Hall-ICs, a position signal synthesize control algorithm is developed. Also, considering diagnosis of permanent magnet brushless DC (PM BLDC) motor control and safety operation or system protection in case of having trouble and fault in one of Hall-ICs during operation, the developed two Hall-IC control scheme is applied. With the position signal of phase lock loop (PLL) control algorithm and the remainder scheme, one can operate the slotless PM BLDC motor in high performance.

In these days, a study on the new luminous source using CNT (carbon nanotube) is in the limelight of mass communication. The core of this study is the principle of field emission in the CNT where electrons are discharged when electric field is applied to the tip of sharp emitters in vacuum and how to drive the pulse generator system for CNT field emission. In this paper, to drive CNT Lamp, various methods are applied to CNT Lamp such as a high DC voltage generator between the anode and the cathode, a high voltage pulse generator between the anode and the cathode, and a high DC voltage generator between the anode and the cathode with a uni-polar or bi-polar pulse generator between the gate and the cathode in CNT triode. The experimental results demonstrate that the applied uni-polar or bi-polar pulse voltage between the gate and the cathode of the CNT triode have advantages over the applied DC high voltage between the anode and the cathode in the respects of brightness and efficiency