• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.367-368
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• 2010

본 논문에서는 삼상 AC-DC 컨버터와 강압컨버터를 이용한 배터리 충전장치를 제안한다. 제안 하는 배터리 충전시스템은 상용전원뿐만 아니라 태양광시스템의 MPPT제어를 통하여 최대전력을 공급받아 급속충전시스템의 CV/CC(정전압/정전류) 모드 제어를 통해 배터리를 빠르게 충전한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.344-346
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• 2022

본 논문에서 거푸집의 가장취약 부분인 접합부위에 로드센서를 부착하여 실시간 콘크리트 측압을 측정 할 수 있으며, 관리자는 모니터링을 통하여 확인 할 수 있도록 하며 LORA의 저전력 장거리 통신망을 사용하는 디바이스를 개발하여 로드센서에 측정한 값을 데이터변경, 웹 기반의 클라우드 서비스로 발송하여 PC 및 Mobile로 확인 할 수 있는 시스템을 구축하였다. 여러가지 센서로부터 데이터를 수신하여 모바일로 송신해 주는 무선송수신기의 개발을 원하고 있으며, 하중센서, 경사도센서, 풍향센서 등 다중 데이터값을 수신할 수 있어야 한다. 이렇게 구성된 센서와 데이터의 수신을 통해서 콘크리트 타설시 발생하는 측압을 측정하고 공사기간 동안 별도의 전원 공급 없이 작동이 유지될 수 있는 시스템을 구축하였다. 수요자가 Application과 호환이 이루어져야 하며 또한 MEMS센서를 이용하여 상태를 모니터링 하고 임계값을 지정하여 이상 신호 발생시 위험상황에 대해서 인공지능기법을 이용하여 관리자에게 알림을 주어 효과적으로 사용할 수 있는 시스템을 개발하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.5
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• pp.3100-3106
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• 2014

This paper develops power measurement system with multiple sensor input channels (voltage-8 channels and current-10 channels) that simultaneously can monitor power components for both supply and load side of power system. The hardware implementation of the proposed system is based on TMS320C42 DSP and signal processing program algorithm to calculate power components use the definition of IEEE Standard 1459-2010 related power quality. The performance of the developed system is tested by using standard ac power source device, and the test results showed that accuracy of the developed system is less than 0.2 %. Also, field test of the proposed system in the three-phase and four-wire power system was implemented. Simultaneous multiple channel measurement and analysis of power components in commercial and industrial electrical power system using the proposed system will be necessary to reduce power quality problems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.9
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• pp.45-50
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• 2016

This paper reports a Ringer's solution detector and transceiver design for the efficient management of patients. The ringer's solution detection and transceiver consisted of the main control part, ringer's solution detection part, display and warning light part, wireless transceiver, and power supply part. The light receiving part of the ringer's solution detection part employed TSL260R-LF photodiode; light permeating part, Water-Clear type LED; and wireless transceiver part, the RF wireless data transceiver module, NR-FPCX. As a result of this Ringer's solution detector and transceiver design that can manage the patient efficiently, it was found that when the ringer's solution was detected by the double photodiode, the operating frequency was 11.95kHz; when it was not detected, the number was 9.6kHz. In the ringer's solution receiver, when the ringer's solution was detected, the number was 0. The corresponding unique RF code was displayed when not detected. The power used in the ringer's solution detection part was converted to the Sleep mode to operate under battery save mode. The ringer's solution transceiver can exchange wireless communication approximately within a 700m radius.

• Economic and Environmental Geology
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• v.50 no.3
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• pp.251-256
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• 2017

This study presents measures to enhance the efficiency of Successive Alkalinity Producing Systems(SAPS), a natural biological purification method that prevents environmental pollution arising from the release of Acid Mine Drainage(AMD) from abandoned mines into rivers and groundwater. The treatment of AMD using SAPS is based on biological processing technology that mostly involves sulfate reducing bacteria(SRB). It has been proven effective in real-world applications, and has been employed in various projects on the purification of AMD. However, seasonal decrease in temperature leads to a deterioration in the efficiency of the process because sulfate-reducing activity is almost non-existent during cold winters and early spring even if SRB is able to survive. Against this backdrop, this study presents measures to enhance the activity of the SRB of the organic layer by integrating light emitting diode(LED)s in SAPS and to maintain the active temperature using LEDs in cold winters. Given that mine drainage facilities are located in areas where power cannot be easily supplied, solar cell modules are proposed as the main power source for LEDs. By conducting further research based on the present study, it will be possible to enhance the efficiency of AMD treatment under extreme cold weather using solar energy and LEDs, which will serve as an environmentally-friendly solution in line with the era of green growth.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.2
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• pp.187-192
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• 2019

Hybrid power storage system with emergency power function for demand management and power outage minimizes the investment cost in the building of buildings and factories requiring emergency power generation facilities, We propose a new business model by developing technology that can secure economical efficiency by reducing power cost at all times. Normally, system power is supplied to load through STS (Static Transfer Switch), and PCS is connected to system in parallel to perform demand management. In order to efficiently operate the electric power through demand forecasting, the EMS issues a charge / discharge command to the ESS as a PMS (Power Management System), and the PMS transmits the command to the PCS controller to operate the system. During the power outage, the STS is rapidly disengaged from the system, and the PCS becomes an independent power supply and can supply constant voltage / constant frequency power to the load side. Therefore, it is possible to secure reliability through verification of actual system linkage and independent operation performance of hybrid ESS, By enabling low-carbon green growth technology to operate in conjunction with an efficient grid, it is possible to improve irregular power quality and contribute to peak load by generating renewable energy through ESS linkage. In addition, the ESS is replacing the frequency follow-up reserve, which is currently under the charge of coal-fired power generation, and thus it is anticipated that the operation cost of the LNG generator with high fuel cost can be reduced.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1341-1344
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• 2006

임베디드 시스템의 신인도(Dependability)를 확보하기 위해 하드웨어적으로 여분을 두는 결함 허용(Fault-tolerant) 기법을 적용하는 것은 임베디드 시스템의 설치공간, 비용 및 전원 공급의 부족 등의 이유로 무리가 있다. 본 논문에서는 소프트웨어 결함 허용 기법의 일종인 시간 여분(Time-redundancy) 개념을 적용한 Extended Temporal Error Detection (E-TED) 기법을 연구하였으며, 실험을 통해 제안한 E-TED 기법이 기존의 TED 기법에 비해 데이터 오류의 감지 확률이 높은 것을 확인하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1748-1749
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• 2011

본 논문에서는 최근 전기자동차의 개발과 동시에 연구가 활발히 진행되고 있는 전기자동차의 충전시스템인 EVSE(Electric Vehicle Supply Equipment) 시뮬레이터를 구현하고 성능을 검증한다. EVSE는 전기자동차의 충전을 위해 안정적인 전원을 공급하는 기능 이외에도, 충전상태 모니터링, 인증 및 과금 등의 기능이 요구되기 때문에 전기자동차와의 통신이 필수적이다. 따라서 CAN 기반의 전기자동차 충전시스템 시뮬레이터를 구현하고, 제안된 충전 절차에 따른 실험을 통해 차량 인증, 차량 정보 확인 및 모니터링 프로그램의 성능을 검증한다.

• Aerospace Engineering and Technology
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• v.11 no.1
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• pp.1-6
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• 2012

Power system in satellite is protected by installing fuses, LCLs (Latching Current Limiters), etc. between satellite power supply and loads. In this paper, the fuse sizing technique for satellite power system protection is addressed. Detailed fuse sizing method is explained and it is shown that the single fuse connection method is mathematically subordinated to the parallel fuse connection method. In addition, appropriate fuse selection method is newly suggested under a situation where exact current characteristics of a load connected to a fuse is unknown.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1471-1472
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• 2015

원자력 발전소 소내 전력계통은 구성에 있어서 여느 발전소와 크게 다를 바 없지만, 원자력안전계통에 전원을 공급하는 안전 1E 등급 전력계통은 전기관련 법규와 규정 외에도 원자력관련 법규와 규정을 준수해야 하고 규제기관의 검토와 승인을 받아야 하는 점에 있어서 상당한 차이점이 있다. 또한 설계기간만도 7년이 소요되는 만큼 설계문서 관리도 복잡하고 까다로울 수밖에 없다. 게다가 최근 더욱 높아진 원자력안전에 대한 의식과 규제로 인하여 현재 세계 각국의 원자력 발전소 건설프로젝트들이 공기지연과 건설비 예산 초과로 어려움을 겪고 있다. 본 논문에서는 이러한 현안에 대한 대책의 일환으로 시스템즈 엔지니어링 기법을 소내 전력계통에 적용하는 방법을 제시하고자 한다. 시스템즈 엔지니어링이란 품질목표를 달성함과 함께 예정된 공기와 예산범위 내에 프로젝트를 완성하도록 지원하는 엔지니어링 기법이다.