Abstract:
The present invention relates to a single photon detector (SPD) in 1.55 μm based on an InGaAs/InP avalanche photo diode (APD.) To operate the SPD in low back pulse noise, a DC bias voltage which is lower than a breakdown voltage is applied to the InGaAs/InP APD. A bipolar rectangular gating signal is overlapped with the DC bias voltage and is applied to the APD to exceed the breakdown voltage during a gate-on time of each period of the gate signals. The usage of the bipolar rectangular gating signal is provided to operate the APD in a voltage which is lower than the breakdown voltage during a gate-off time, thereby rapidly discharging trapped charge carriers and reducing the back pulse noise. Therefore, the increase of the repetition rate of the SPD is possible. [Reference numerals] (102) Gate signal; (103) DC bias; (104) Bias tee; (106) Input signal; (107) Output signal
Abstract:
PURPOSE: A system for operating an unmanned boat for monitoring water resource and a method thereof are provided to automatically obtain water resource information in a specific area even though the area is out of a visual observation range of a navigator. CONSTITUTION: An unmanned boat(100) obtains water resource information and sails automatically. A control station(200) communicates with the unmanned boat. The control station controls unmanned sailing and water resource information acquisition. The unmanned boat includes a propulsion unit, a sailing unit, an observation unit and a communication control unit. The propulsion unit propels a hull. The sailing unit provides moving direction setting information of the hull. [Reference numerals] (310) Public network
Abstract:
본 발명은 한국산 무당거미(Nephila clavata)의 장으로부터 분리된 신규 미생물 및 이로부터 생산된 단백질분해효소에 관한 것으로, 단백질 분해 활성을 나타내는 본 발명의 신규 미생물 아라니콜라 프로테오리티쿠스(Aranicola proteolyticus) HY-3는 20 내지 40 ℃의 온도 및 6 내지 10의 pH에서 안정하며 약 51.5 kd의 분자량을 갖는 단백질분해효소를 생산한다.