• 전기학회논문지
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• 제65권5호
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• pp.760-768
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• 2016

Recently, as one of the policies for carbon free operation method of independent power system replacing diesel generator with renewable energy such as wind power and photovoltaic(PV) system has been presented. Therefore, this paper proposes an operation algorithm and modeling of independent power system by considering CVCF(constant voltage constant frequency) ESS(energy storage system) for constant frequency and voltage, LC(load control) ESS for demand and supply balancing and SVC(static var compensator) for reactive power compensation. From the simulation results based on the various operation scenario, it is confirmed that proposed operation algorithm and modeling may contribute stable operation and carbon free in independent power system.

• 한국산업융합학회 논문집
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• 제25권6_3호
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• pp.1199-1206
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• 2022

Fossil fuels are one of the various energy sources used by humans, and industrial development has been achieved by relying on fossil fuels for a long time in the past. In order to respond to the depletion of fossil fuels and climate change, the world is trying to build an eco-friendly energy ecosystem. Research on efficiency improvement using renewable energy and ESS in various ways for energy conversion is being promoted. In this paper, a microgrid for industrial complexes was designed, constructed, and demonstrated. It was operated in two modes: an independent mode that each plant generates and uses independently and a connected operation mode that allows energy sharing between factories. In the case of independent mode, PV and PCS were intermittently stopped and restarted according to the status change of SoC section of each site. But, in the case of the connected operation mode, stable power supply was confirmed through power transaction through the operation of the entire SoC. This paper presented and verified an algorithm to stably supply power to industrial complexes consisting of various consumers with different load characteristics.

• 한국경영과학회지
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• 제26권1호
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• pp.71-85
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• 2001

This paper considers a cost model for a U-shaped manufacturing cell formation which incorporates a required number of machines and various material flows together under multi-part multi-cell environment. The model is required to satisfy both the specified operation sequence of each part and the total part demand volume, which are considered to derive material handling cost in U-shaped flow line cells. In the model several cost-incurring factors including set-up for batch change-over, processing time for operations of each part, and machine failures are also considered in association with processing load and capacity of each cell. Moreover, a heuristic for a good machine layout in each cell is newly proposed based on the material handling cost of each alternative sequence layout. These all are put together to present an efficient heuristic for the U-shaped independent-cell formation problem, numerical problems are solved to illustrate the algorithm.

• Smart Structures and Systems
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• 제16권4호
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• pp.743-758
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• 2015

This paper presents an advanced life cycle cost (LCC) analysis of a ground source heat pump (GSHP) system and suggests a smart operation mode with a thermal performance test (TPT) and an energy pile system constructed on the site of the Incheon International Airport (IIA). First, an economic analysis of the GSHP system was conducted for the second passenger terminal of the IIA considering actual influencing factors such as government support and the residual value of the equipment. The analysis results showed that the economic efficiency of the GSHP system could be increased owing to several influential factors. Second, a multiple regression analysis was conducted using different independent variables in order to analyze the influence indices with regard to the LCC results. Every independent index, in this case the initial construction cost, lifespan of the equipment, discount rate and the amount of price inflation can affect the LCC results. Third, a GSHP system using an energy pile was installed on the site of the construction laboratory institute of the IIA. TPTs of W-shape and spiral-coil-type GHEs were conducted in continuous and intermittent operation modes, respectively, prior to system operation of the energy pile. A cooling GSHP system in the energy pile was operated in both the continuous and intermittent modes, and the LCC was calculated. Furthermore, the smart operation mode and LCC were analyzed considering the application of a thermal storage tank.

• 한국태양에너지학회 논문집
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• 제36권5호
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• pp.19-30
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• 2016

In this study, realize voltage regulation $220Vac{\pm}10%$ or less, frequency fluctuation $60Hz{\pm}1%$ or less over the independent operation and grid-connected operation technologies for power stabilization relates to the ESS designed and manufactured in conjunction with solar installations and solar to compensate the output reduction due to the polarization of the solar module through the polarization prevention technology for preventing the optical module efficiency is lowered, in conjunction with the BMS inverter efficiency was more than 92%, more than 90% of the charging efficiency to the target. This study was designed in conjunction with the ESS solar power plants, grid-connected operation and independent operation, Peak-Cut, it can stabilize the grid via the Peak-Shifting operation

• Journal of the Optical Society of Korea
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• 제20권1호
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• pp.180-187
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• 2016

The independent operation of a color filter for incident polarization is demonstrated using a guided-mode resonance (GMR) filter employing a metal-insulator-metal (MIM) waveguide. To achieve independent operation, a rectangular MIM grating is proposed as a wave-guide resonator. The design considerations are discussed and include how to determine the grating period and slit width. Power flow distribution is observed with slit width variation. Blue-green, green-red, and blue-red filters for corresponding x- and y-polarizations are demonstrated as application examples with numerical simulation with rectangle-shaped MIM grating. As a practical application, feasibility as a chromatic polarizer is discussed.

• 한국문헌정보학회지
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• 제53권4호
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• pp.399-418
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• 2019

최근 독립출판물에 대한 사회적 관심과 이용자 요구의 증가로 공공도서관을 통한 독립출판물의 장서운영이 확대되고 있다. 그러나 공공도서관에서는 독립출판물의 다양한 형태 사항과 서지정보 제공의 부실 등으로 인하여 장서로 운영하는 데에 어려움을 겪고 있다. 이에 공공도서관에서 독립출판물을 효과적으로 관리를 할 수 있는 방안을 제시하기 위해 공공도서관의 독립출판물 장서 현황 분석과 독립출판물 담당자와의 심층인터뷰를 진행하였다. 그 결과 독립출판물을 효과적으로 관리할 수 있는 방안으로 공공도서관 독립출판물 목록 구축 및 공유를 위한 공동목록시스템 구축, 독립출판물의 다양한 정보를 수집할 수 있는 플랫폼, 독립출판물의 ISBN, ISSN, CIP 발급 지원, 유통시스템의 개선이 필요한 것으로 도출되었다.

• 한국영어학회지:영어학
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• 제1권4호
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• pp.561-585
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• 2001

It has been claimed recently that the two computational operations Move and Agree of Chomsky (2000, 2001a) should be separated into distinct and independent operations. According to this view, Move is an “operation that applies only to meet an EPP-feature of a functional category.” It is also claimed under that analysis that “a candidate for Move is simply a syntactic object with phonetic content.” The purpose of this short paper is to show that the operation Move should still be viewed as composite; hence it must have the operation Agree as one of its prerequisites. We argue that the EPP feature of T may not be analyzed as an independent feature that triggers overt displacement in syntax. Under Chomsky's (2000, 2001a) theory, displacement in syntax must require the probe-goal (P, G) association before the actual movement takes place. It is shown in this paper that in order for an element $\beta$ to raise to the [Spec, T] position, the $\varphi$-features of T must establish a (P, G) relation with those of $\beta$ prior to movement. In short, Move requires Agree, the EPP feature being dependent on the minimal $\varphi$-feature [person] of nominals.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.159-160
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• 2007

Two analog predsitorters (PDs) using the mixing operation are proposed to compensate for the memory effects of the power amplifier and then significantly cancel IM3 components with the independent control of IM3 terms. In the first PD, IM3 terms are generated by using mixing operation of low frequency terms. In the second PD, the double mixing operation of the fundamental components is used. For a two-tone signal with 20-MHz tone spacing, the notable IM3 suppression is achieved over a whole output power range.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2010년도 추계학술대회
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• pp.57-58
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• 2010

본 논문은 자동화 컨테이너 터미널에서 하역작업을 수행하는 ATC의 독립성 유지를 위한 운영시스템을 제안한다. 기존 컨테이너 터미널에서 사용하는 운영시스템(TOS : Terminal Operation System)에는 이를 위한 많은 지능형 알고리즘이 개발되어 있고 이에 대한 연구도 활발히 이루어져 왔다. 이에 따라 TOS의 규모가 방대해짐에 따라 개발 및 유지 보수에 막대한 시간과 인력이 소요된다. 또한 새로운 장비가 도입되거나 새로운 알고리즘이 도입될 경우 TOS전체를 수정해야 하는 경우도 발생할 수 있다. 이에 따라 장비와 TOS를 보다 유동적이며 대체가 용이하도록 연결하기 위한 개념이 필요하나 이에 대한 연구는 미미한 실정이다. 따라서 본 연구는 기존 컨테이너 터미널 운영시스템에 독립적으로 계획, 통제, 지시, 모니터링과 같은 여러 기능을 수행하는 시스템을 설계하도록 한다.