43 research outputs found
The Evaluation of brain functions based on the analysis of electroencephalogram in prefrontal lobe during science learning activities
No full text학위논문(박사)--서울대학교 대학원 :과학교육과 생물전공,2002.Docto
One-Pot Gram-Scale, Eco-Friendly, and Cost-Effective Synthesis of CuGaS2/ZnS Nanocrystals as Efficient UV-Harvesting Down-Converter for Photovoltaics
No full textIt is presented for the first time nontoxic CuGaS2/ZnS quantum dots (QDs) with free-self-reabsorption losses and large Stokes shift (>190 nm) synthesized on an industrially gram-scale as an alternative for Cd-based energy-downshift (EDS)-QD layers. The QDs exhibit a typical EDS that absorbs only UV light (<407 nm) and emits the whole range of visible light (400-800 nm) with a high photoluminescence-quantum yield of approximate to 76%. The straightforward application of these EDS-QDs on the front surface of a monocrystalline p-type silicon solar cell significantly enhances the short-circuit current density by approximate to 1.64 mA cm(-2) (+4.20%); thereby, improving the power-conversion-efficiency by approximate to 4.11%. The significant improvement in the external quantum efficiency increases by approximate to 35.7% and that in the surface reflectance decreases by approximate to 14.1% in the UV region (300-450 nm) clearly manifest the photovoltaic enhancement. Such promising results together with the simple (one-pot core/shell synthesis), cost-effective (reduction in a bill of material-system by approximate to 2.62%), and scalable (2000 mL three-neck flask, 11 g of QDs) preparation process might encourage the manufacturers of solar cells and other optoelectronic applications to apply these EDS-QDs to different broader eco-friendly applications.The authors would like to acknowledge the support of the Ministry of Higher Education, Kingdom of Saudi Arabia for supporting this research through a grant (PCSED-008-14) under the Promising Center for Sensors and Electronic Devices (PCSED) at Najran University, Kingdom of Saudi Arabia. This research was also supported by the Brain Korea 21 PLUS Program in 2014
Cyber-physical system, Method for controlling the auto control system, and computer program for executing the method
No full text본 발명의 일 실시예는 네트워크 기반으로 물리 시스템을 제어하는 자동 제어 시스템;을 포함하고, 상기 자동 제어 시스템은 제1 제어부 및 제2 제어부를 포함하고, 상기 제1 제어부는, 상기 자동 제어 시스템에서 처리되는 데이터들에 기초하여 상기 자동 제어 시스템의 정상 동작 여부를 감시하고, 감시 결과 공격이 감지되면 상기 제2 제어부에 경고 신호를 출력하고, 상기 제2 제어부는, 상기 물리 시스템을 제어하고, 상기 경고 신호가 수신되면 상기 경고 신호에 기초하여 상기 제2 제어부를 복원하고, 상기 경고신호에 기초하여 상기 물리 시스템의 제어 권한을 상기 제1 제어부에 부여하는, 사이버 물리 시스템을 개시한다
