In this paper, a tidal power conversion system (PCS) using seawater level differences was presented.. To verify the presented PCS, an actual lab-scale tidal power generation system was constructed. The operation of the lab-scale PCS was first modeled mathematically and was analyzed through dynamic simulation and experimental tests.

Despite the presence of the p-Channel MOSFET inrush current limiter circuit within the power supply unit of military radar, The internal MOSFET and DC-DC Converter has been damaged due to the high inrush current. In this paper, the cause of the high inrush current was identified by analyzing the p-Channel MOSFET inrush current limiter circuit. Based on the analysis, the high inrush current was reduced by about 60% by adjusting the time constant of the source-to-gate elements compared to before improvement.

This paper is a study on the malfunction that occurred during the power supply logic of the Gunner Display Device during Mortar Functional Firing under low temperature conditions. As a result of the phenomenon reproduction test and its analysis, the cause of the malfunction of the Gunner Display Device was Glitch, which occurred in the process of converting the image signal, and the improved software was applied to the Gunner's Display System by ignoring some of the image signal conversion process that causes Glitch. The improved Gunner Display Device passed the validity test and applied the improvement to the mortars. As a result of this study, several suggestions for power supply and control logic were proposed. It is expected that this study will be used as a reference in the future design of similar weapons systems.

In this study is a study to measure the section by voltage through the high integration of the circuit of the inspection equipment for the power supply circuit of semiconductor equipment. The experiment was conducted by increasing the -1.5∼4 voltage section by 0.5V. At this time, the tolerance was applied to ±0.1%+5mA. Although the voltage increased through the experiment, the accuracy of the measurement data did not change, and it was confirmed through this experiment that the null hypothesis(H0) was adopted in each section through the hypothesis test.

In this paper, the injectors with normal quantity, over quantity of +10%, under quantities of -10% and –30%, were mounted on S-ENG and P-ENG in order to measure the voltage energy, current energy and power supplied to the injectors and the fuel economy under several speed of rpm conditions. The voltage and current energy of S-ENG was greater than P-ENG, and the power of S-ENG was measured and analyzed 4.8 times higher than that of P-ENG at all injectors, and the tendency of carbon dioxide emissions calculated from fuel efficiency measurement results was not significantly affected by the type of injectors, but P-ENG was measured to be slightly affected by the type of injectors. It is assumed that the model year and mileage of the test vehicle affects this tendency.

Maintenance of power distribution facilities is a significant subject in the power supplies. Fault caused by deterioration in power distribution facilities may damage the entire power distribution system. However, current methods of diagnosing power distribution facilities have been manually diagnosed by the human inspector, resulting in continuous pole accidents. In order to improve the existing diagnostic methods, a thermal image analysis model is proposed in this work. Using a thermal image technique in diagnosis field is emerging in the various engineering field due to its non-contact, safe, and highly reliable energy detection technology. Deep learning object detection algorithms are trained with thermal images of a power distribution facility in order to automatically analyze its irregular energy status, hereby efficiently preventing fault of the system. The detected object is diagnosed through a thermal intensity area analysis. The proposed model in this work resulted 82% of accuracy of detecting an actual distribution system by analyzing more than 16,000 images of its thermal images.

This study describes the result on PV system for evaluating the performance of small fishing boats. Photovoltaic system with 200 watts power generation facilities on the 3-ton fishing boat was carried. Load test was performed on the condition that the work lamps lit during night operations. As a result the performance can be used for more than two hours at 60 watt work lamps. The load test was performed on the condition that fishing vessels are on the cruising condition at sea. The solar power systems have been investigated as a power generation efficiency of about 36.55%. Additional tests show that the power generation efficiency is difficult to expect a maximum of 50% or more.Fuel consumption of fishing boats by installing a solar power system is reduced. Also the PV system is useful for the verification of their availability for fishing vessels as well as the satisfaction of the fishermen. The results for the durability of the photovoltaic device is acceptable, including a solar panel, controller and the performance exhibited no breakage in the harsh marine environment or failure so far. The installed PV system was confirmed that the durability with at least 2 years.

This study examined test piece production and on-the-spot test results of power supply system of road surface temperature sensor module that was put to forecast road freezing at bridge section. The temperature sensor module was produced to replace sensitive sensor (temperature and humidity sensor) of road surface that was put by wire system, and to supply power on-the-spot by itself, And, the study researched optimization considering power consumption for self power generation and sensor operation.

본 논문은 광범위한 전력제어가 가능하고, PC 직렬통신 방식에 의해 원거리에서 시스템을 ON-OFF할 수 있으며, 시스템의 상태를 모니터링 할 수 있는 선박비상조명시스템의 전력제어특성 개선에 관해 연구한다. 제안된 시스템은 강압형 컨버터, 비상급전회로, 반 브리지 인버터, 형광램프기동회로, 마이크로프로세서 제어 및 멀티통신회로 등으로 구성된다. 실험을 통하여 과전류에 의한 해당 시스템의 정지와 주전원 차단시의 비상전원에 의한 신속한 급전을 확인할 수 있고, 입력전력은 35[%] 범위까지 제어됨을 확인한다. 또한, 원거리에서 원하는 시스템을 ON-OFF 하고, 시스템의 전력, 전압, 전류, 배터리 전압 등의 모니터링도 한다.

요즘 다목적댐의 수력발전을 일으킬 수 있는 수자원은 용수공급이 증가함에 따라서 점점 감소하고 있는 형편이다. 한편 국내 수력 발전량의 거래가 다자간의 시장경제 체제로 형성될 경우, 수력에너지 생산자는 최적 공급량과 공급의 수문학적 신뢰도 수준을 제시해야 한다. 이에 본 연구에서는 금강 수계 내 위치한 용담다목적댐의 수력 발전소에서 공급가능한 발전량과 공급 신뢰도를 평가하기 위하여 저수지 조작 기법으로 선형계획법을 적용하였고 1차원 조사법을 이용하여 유입

본 논문은 선박비상조명용 디지털 전원장치의 개발에 관해 연구하였으며, 비상조명용 전원장치는 비상급전시스템, 반 브리지 인버터, 형광램프 기동회로 및 마이크로프로세서 제어시스템 등으로 구성되어 있다. 실험을 통하여 기존의 아날로그형 비상급전시스템에 비해 신속하고 안정된 전력이 공급되고 있음을 확인하고, 인버터의 펄스주파수 가변에 의한 조명제어가 잘 이루어지고 있음을 확인한다.