• Title/Summary/Keyword: 전원 관리 시스템

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A Study on Performance of Solid Oxide Fuel Cell System for Ship Applications (선박 전원용 고체산화물형 연료전지(SOFC) 시스템 성능에 관한 연구)

  • Park, Sang-Kyun;Roh, Gill-Tae;Kim, Mann-Eung
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.5
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    • pp.582-589
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    • 2011
  • The fuel cell technology has been considered as a technology to reduce greenhouse gases emission from a ship. In this research, internal reforming 500kW solid oxide fuel cell system fueled by methane for a ship were developed. Characteristics of gas temperature, stack power and system efficiency depending on the air flow rate, $CH_4$ flow rate, $H_2O$ flow rate, and system operation pressure are evaluated. As a result, air and $CH_4$ flow rate directly affect the temperature of inlet and outlet gas in the fuel cell stack. When the air and $H_2O$ flow rate increase, the stack power and system efficiency increases. However, the case of $CH_4$ flow rate increase, the efficiency decreases.

A Case Study on the Implementation of a River Water Level Monitoring System using PLC(Programmable Logic Controller) and Public Telecommunication Network (PLC(Programmable Logic Controller)와 공중통신망을 이용한 하천수위감시시스템 구축 사례 연구)

  • Kim, Seokju;Kim, Minsoo
    • The Journal of Society for e-Business Studies
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    • v.20 no.4
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    • pp.1-17
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    • 2015
  • A river water level monitoring system which prevents salt water damages and effectively excludes floods has been developed to contribute efficient operation of Nakdong river estuary barrage. The system can be used for monitoring upstream conditions more quickly and do appropriate responses over changes. Telemetry and telecontrols using PLCs have been built at the three sites that directly influence on the operation of barrage gates, and are linked to Nakdong river estuary barrage's IOS (Integrated Operation System) through public communication networks. By using PLC, the system can achieve even higher reliability and versatility than before as well as easy management. By power control devices, we can remotely control the power of PLCs to treat the minor troubles instantly without going on-sites. The power control devices also save data in preparation for the cases of communication failures. The system uses ADSL (FTTH) as a main network between SCADA server and PLCs, and CDMA (M2M) as a secondary network. In order to compensate security vulnerabilities of public communication network, we have installed the VPNs for secure communication between center and the observation stations, just like a dedicated network. Generally, river water level observations have been used custom-manufactured remote terminals to suit their special goals. However, in this case, we have established a system with open architecture considering the interface between different systems, the ease of use and maintenance, security, price, etc.

Implementation of e-Meters System Middleware base on RFID/USN (RFID/USN기반 e-Meters 시스템의 미들웨어 구현)

  • Jun, Won-Goo;Lee, Myung-Ho
    • Journal of Advanced Navigation Technology
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    • v.15 no.5
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    • pp.729-734
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    • 2011
  • In this paper, e-Meters middleware and applications using standardized middleware in the EPCglobal is suggested. An standardized middleware of the EPCglobal is designed to manage as a form of SCM and other logistics. In order to support a variety of services using RFID-based, the system must be able to support each protocol. The main features of e-Meters middleware is consist of information status and delivery, distributed database processing, event data analysis, and handling. To operate real time e-Meters system information, The realized middleware is configured to process the results of data collection.

A Study on the Domestic Fireworks System (불꽃놀이 시스템의 국산화에 대한 연구)

  • Choi, Joon-Kee;Son, Moo-Yeol;Lee, Jong-Kwang
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.7 no.1
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    • pp.1-9
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    • 2014
  • Fireworks are used in our country, most of U.S. equipment and software systems are old and outdated technology. If the Fireworks receives a signal, then the start of the pre-placed as the signal proceeds to the middle of a problem with the site manager directly turn off the power and turn on again. Manager, where it should be handled directly. So, in this paper, we researched a domestically developed technology to escape the reality that relies on foreign technology. Our technology should be suited the convenience, reliability and lower cost. This technology can generate revenue from overseas.

An Empirical Study on Battery Replacement Cycle for UPS of Scientific Boundary System (과학화경계시스템 UPS 축전지 교체주기 실증연구)

  • Yong Kim;Dae Woong Kim
    • The Journal of the Convergence on Culture Technology
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    • v.10 no.5
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    • pp.651-657
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    • 2024
  • Scientific boundary systems have various factors influencing failure for each system. Among them, components such as storage batteries tend to have fluid tendencies compared to other components due to influencing factors such as chemical change rates, which makes it difficult to collect and manage data. Accordingly, this study collected the performance trends of UPS(Uninterruptible Power Supply) batteries for the last three years, targeting four divisional units for the scientific boundary system. Through this, the appropriateness of the currently set 3.5-year replacement cycle was demonstrated and studied.

Performance Evaluation of the New Smart Passive Control Device using Shaking Table Test (진동대 실험을 통한 신개념 스마트 수동제진장치의 제진성능 평가)

  • Jang, Dong-Doo;Jung, Hyung-Jo;Moon, Seok-Jun
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.23 no.1
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    • pp.27-35
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    • 2010
  • This paper presents the vibration control performance of the smart passive control system to suppress the undesired vibration of the structure subjected to the earthquake loadings. Smart passive control system is the MR damper-based control system augmented with electromagnetic induction(EMI) device which consists of permanent magnets and solenoid coils. According to the Faraday's law of electromagnetic induction, an EMI device produces electrical energy from the mechanical energy due to the reciprocal motions of the structure and provide it to the MR damper. The smart passive control system can be the simple and easy to implement and maintain control system by replacing the feedback control system including sensors, controllers and external power sources of the conventional MR damper-based semiactive control system with the EMI device. The control performance of the smart passive control system is evaluated through the set of shaking table test considering the various historical earthquake loadings.

The Power characteristic of IPT system for electric railway vehicle by various air-gap (공극변화에 따른 전기궤도차량용 유도급전시스템의 공급전원 특성)

  • Cho, Gi-Hyun;Han, Kyung-Hee;Lee, Byung-Song;Choi, Kyu-Hyung
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.928-934
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    • 2006
  • In this paper, the inductive power collector using electromagnetic induction for vehicle such as the electric railway vehicle system is suggested and some ideas for power collector design to improve the power transfer performance are presented. The inductive power of secondary part is related to amount of linked flux to secondary part by the length of air-gap, which is expected by such a system parameter as mutual inductance. This paper will study for the transfer characteristic of power from input to output and equation including mutual inductance.

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A Study on Development of Independent Low Power IoT Sensor Module for Zero Energy Buildings (제로 에너지 건축물을 위한 자립형 저전력 IoT 센서 모듈 개발에 대한 연구)

  • Kang, Ja-Yoon;Cho, Young-Chan;Kim, Hee-Jun
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.3
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    • pp.273-281
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    • 2019
  • The energy consumed by buildings among the total national energy consumption is more than 10% of the total. For this reason, Korea has adopted the zero energy building policy since 2025, and research on the energy saving technology of buildings has been demanded. Analysis of buildings' energy consumption patterns shows that lighting, heating and cooling energy account for more than 60% of total energy consumption, which is directly related to solar power acquisition and window opening and closing operation. In this paper, we have developed a low - power IoT sensor module for window system to transfer acquired information to building energy management system. This module transmits the external environment and window opening / closing status information to the building energy management system in real time, and constructs the network to actively take energy saving measures. The power used in the module is designed as an independent power source using solar power among the harvest energy. The topology of the power supply is a Buck converter, which is charged at 4V to the lithium ion battery through MPPT control, and the efficiency is about 85.87%. Communication is configured to be able to transmit in real time by applying WiFi. In order to reduce the power consumption of the module, we analyzed the hardware and software aspects and implemented a low power IoT sensor module.

농업용수 시험지구 운영을 통한 용수이용 효율성 제고

  • 김진택
    • Proceedings of the Korea Water Resources Association Conference
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    • 2002.02a
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    • pp.309-324
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    • 2002
  • 국내의 경우 관개용수의 대부분은 벼생육을 위한 논의 관개응수로 사용되고있다. 농업용수 이용은 약 150억㎥/year, 이는 하천유지수량을 제외한 전체 물이용량 237억㎥/year의 약 63%에 해당한다. 최근 물절약은 가장 중요한 사회, 경제적인 이슈 중의 하나로 인식되고 있다. 그러나, 국내의 경우 관개효율은 여전히 낮아 약 35%의 관개용수가 손실되는 것으로 추정되고있다. 비록 관개에서의 물절약이 시급한 문제이기는 하지만 용수손실 원인에 따른 손실량에 대한 정량적인 연구가 행해지지 않았었다. 손실 원인에 따른 손실량을 계측하기 위한 시험지구로 경기 평택의 이동지구를 선정하였다. 시험지구의 주수원공으로는 유역면적 9,440ha, 관개면적 2,027ha인 이동저수지이며 상류유역에 미산 및 용덕저수지가 위치하고 관개지구내에 원암 및 은산양수장이 있다. 시험지구의 계측시설은 강우량 계측을 위하여 자기강우계를 설치하였고 저수위, 하천수위 및 응배수로의 수위 측정을 위하여 수위계를 설치하였다. 강우계는 4개소에 설치되었으며 수위계는 26개소에 설치되었다 강우계는 지구내의 저수지 및 양수장 관리사 부근 4개소에 전도형 자기우량계를 설치하였다. 수위계 26개소 중에서 저수지의 저수위 계측지점이 3개소이며 하천수위 계측지점이 2개소 그리고 용배수로의 간선수로 시점부와 간지선 분기점 등의 주요지점에 21개소의 계측지점이 있다. 모든 계측지점의 계측기에는 자체 혹은 별도의 자료저장용 데이터로거가 부착되어 현장 계측자료를 저장하도록 설치 되어있다. 강우계는 전도형강우계(tipping bucket type)이며 수위계는 계측지점의 특징에 따라 여러종류의 수위계측기가 설치되었다 예를들어 초음파수위계(ultrasonic-wave type), 부표식수위계(float type) 그리고 압력식수위계(Pressure type)가 설치되어 있다. 현장 계측기의 전원은 한국전력 전원 혹은 태양전지 및 축전지를 사용하였다. 수위계측지점의 유량을 환산하기 위하여 계측지점의 단면조사와 유속측정을 통해서 수위-유량관계(rating curve)를 규명하였다. 시험지구의 관개효율 및 용수손실 규명 등에 관한 기본자료를 수집하기 위해서는 계측시스템의 운영은 장기간으로 지속 되어야 한다

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Design and Implementation a Remote Control Smart Multi-plug based on Wireless Network (무선 네트워크 기반 원격제어 스마트 멀티 플러그의 설계 및 구현)

  • Lee, Sang Hoon;Won, Hui Chul;Kim, Su-Yeon
    • Journal of Korea Society of Industrial Information Systems
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    • v.20 no.4
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    • pp.47-54
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    • 2015
  • With the spread of smart technology, in the personal and office equipment, many of the products are equipped with smart features. These changes have opened the era that can enforce the user's operation from a remote location. In this study, we design and implement a smart multi-plug system to make a multi-plug installed in the home can be operated anytime and anywhere via wireless network technologies add smart feature to a multi-plug that can be seen easily around us, it is intended to complement the limitations of traditional multi-plugs. The smart multi-plug proposed in this paper, by operating the plug remotely from smart devices at anytime and from anywhere, is possible to provide services required for the weak users such as elderly and children, it is expected that the proposed system are widely used in the various areas requiring remote control of the power supply including u-Farming, terrarium, and smart home, and so on.