• Journal of international Conference on Electrical Machines and Systems
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• 제1권4호
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• pp.498-504
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• 2012

The water-cooled Permanent Magnet Linear Synchronous Motor (PMLSM) has a wide range of applications due to high efficiency, high thrust force density and high acceleration. In order to ensure normal operation and maximum output, both the magnetic and thermal performance are vital to be considered. Based on ANSYS software, electromagnetic and thermal finite-element analysis (FEA) models of a 14-pole, 12-slot water-cooled PMLSM are erected adopting suitable assumptions. Firstly, the thrust force and force ripple with different current densities are calculated. Secondly, the influence of different water flow on the motor heat dissipation and force performance under different operationional conditions are investigated and optimized. Furthermore, for continuous operation, the temperature rise and thrust feature are studied under the rated load 8A, the proper temperature $120^{\circ}C$ and the limited temperature $155^{\circ}C$. Likewise, for short-time operation, the maximum duration is calculated when applied with a certain large current. Similarly, for intermittent operation, load time as well as standstill time are determined with the optimal current to achieve better thrust performance.

• 조명전기설비학회논문지
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• 제24권6호
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• pp.177-182
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• 2010

전력계통은 첨단기술과 함께 발전하고 있다. 최근 전력계통은 새로운 기술개발, 전기설비 및 운영 방법으로 전력계통 운영이 복잡해지고 있다. 전기설비가 발전함에 따라 전력계통의 사고비율이 감소하였지만, 그에 따라 새로운 운영방법이 필요하다. 계통 운영방법이 복잡해짐에 따라 효율적으로 전력계통 운영자들을 훈련시키고 교육시키는 전력계통 시뮬레이터가 필요하게 되었다. 본 논문에서는 LabVIEW 프로그램의 TCP/IP 통신을 이용하여 실시간 전력계통 교육용 시뮬레이터를 제작하였다. 제작한 시뮬레이터는 실제 전력계통에서 일어나는 예측하지 못한 다양한 사건으로 교육자를 지도할 수 있게 제작하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전력기술부문
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• pp.30-34
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• 2005

Due to old Toshiba EMS's database size limit and hardware old aging, KPX(Korea Power Exchange) had introduced New EMS from AREVA(old ALSTOM) in July 2002. After then KPX had committed many man power and time to normalize EMS NA(Network Analysis) functions for using real power system. At initial stage, to normalize State Estimator which is the backbone of all other NA functions and DTS(Dispatcher Training Simulator}, KPX had corrected numerous topology errors, network model errors, non-scanned and wrongly scanned SCADA measured errors. After SE function study, running test and tuning, State Estimator could finally have been run properly and stably from June 2003. Based on SE running, KPX had normalized real time Contingency Analysis, and study mode Power Flow, STNET and DTS. From early 2004, dispatchers have been trained to use NA and DTS for the purpose of stable SE running, NA operation & results reading and urgent equipment outage reviewing. EMS NA have been greatly contributed to operate real time power system stably. Above NA normal operation by KPX own efforts under the no experience of NA running, KPX made a good precedent. This paper is intended to introduce EMS NA normalization process, operation status, and etc in Korea power system operation.

• ETRI Journal
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• 제38권3호
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• pp.479-486
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• 2016

System-on-chip (SoC) designs have a number of flip-flops; the more flip-flops an SoC has, the longer the associated scan test application time will be. A scan shift operation accounts for a significant portion of a scan test application time. This paper presents physical-aware approaches for speeding up scan shift operations in SoCs. To improve the speed of a scan shift operation, we propose a layout-aware flip-flop insertion and scan shift operation-aware physical implementation procedure. The proposed combined method of insertion and procedure effectively improves the speed of a scan shift operation. Static timing analyses of state-of-the-art SoC designs show that the proposed approaches help increase the speeds of scan shift operations by up to 4.1 times that reached under a conventional method. The faster scan shift operation speeds help to shorten scan test application times, thus reducing test costs.

• 전기학회논문지
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• 제61권6호
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• pp.797-803
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• 2012

In this paper, for minimizing the real-time operating load losses of the power transformer, a SCADA optimum operating system was developed, and the economic analyses on the test operation were performed. Transformer loss DB which reflects the economic integration operation criteria was constructed by referring the transformer manufacturer's loss data(iron loss, copper loss). Based on the loss DB, each substation transformer real-time loss was calculated according to the size of the transformer loads, and if integration or separation transformer operating conditions minimizing the loss are met, then a window pops-up and the dispatcher performs the substation equipments operation according to the procedure provided by this system. With the existing SCADA main program, the relation database of the substation facilities and integration/separation operation algorithm were developed and applied to Auto MTR Processor and pconn Processor Task module. Seven stations test data for seven months were analyzed for the economic analyses, and the results showed that Cost-Benefit ratio was 2.64, and IRR(Internal Rate of Return), 36%, which asserted the economic justification of the proposed system.

• 수산해양기술연구
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• 제56권2호
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• pp.126-137
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• 2020

This study collected and analyzed the fishing process of existing fishing boat and newly built fishing boat by using the video observation methods to understand the improvement of fishing operation efficiency and safety according to the scale change of coastal composite fishing boat. The fishing operation efficiency was calculated by analyzing the frequency of movement, the movement distance and the moving time per basket used in the fishing process to derive the improvement of the newly built fishing boat compared to the existing fishing boat. It was confirmed that the mean frequency of movements decreased to 13.9%, the average moving time decreased to 21.8%, the mean movement distance increased to 20.5% and the movement through the top of gunwale did not occur. Movement of frequency, increased and time according to the fishing operation were directly affected by the width of side passages and the presence or absence of walking obstruction such as bulwark stay, hatch coaming and fishing gears on deck. The results of this study are expected to be used as basic data for redesigning into a safe and efficient coastal composite fishing boat in the future.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.343-348
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• 2006

Number of researches on efficient terminal operation system applying RFID(Radio Frequency Identification) are on progress. However, RFID has limitations on tracking and providing accurate positions of containers. In this paper, to enhance the performance of the integrated terminal operation system, an efficient loading management of yard is proposed by applying RFID-based RTLS(Real Time Locating System) that provides real-time accurate positions of containers. We found that a group-based sequence system is more efficient than the existing individual sequence number system in the container yard. In the group-based sequence system, the containers in the same group should have similar characteristics such as port of destination(POD), size, weight, etc. In order to run this system, we have proposed the parameters to the unspecified N bytes of RFID tag which are specified in ISO 18000-7. And, this paper proposed a development of integrated operation system of container terminal using RFID for reducing the ship turnaround time in ubiquitous port environment.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2603-2609
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• 2010

최근 항만에서는 이송장비의 운영 효율성 제고를 위해 운영방식의 개선에 관한 다양한 시도가 이루어지고 있다. 기존 조별운영 방식에서는 특정 안벽크레인에 지연이 발생하면 배정된 YT들도 함께 작업을 중단해야만 하는 문제가 생겼다. 이 문제를 해결하기 위해 본 연구에서는 운영 방식을 풀링운영 방식으로 전환하고 운영 효과를 높이기 위해 장치장 내에 무선 측위 장비를 설치하고 YT의 위치와 혼잡도를 측정하였다. 본 연구를 통해 풀링운영을 위한 YT의 이동을 실시간으로 추적할 수 있게 되었고 장치장의 혼잡도를 객관적으로 분석하고 평가하는 작업통제 방법이 마련되었다.

• Nuclear Engineering and Technology
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• 제40권4호
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• pp.269-276
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• 2008

Operational license of WWER-440/213 units at Paks NPP, Hungary is limited to the design lifetime of 30 years. Prolongation by additional 20 years of the operational lifetime is feasible. Moreover, enhancement of the reactor thermal power by 8% will increase both the net power output and the competitiveness of the plant. Paks NPP is a pioneer considering the power up-rate and preparation of long-term operation of WWER-440/213 design. Systematic preparatory work for long-term operation of Paks NPP has been started in 2000. A regulatory framework and a comprehensive engineering practice have been developed. According to the authors view, creation of a gapless engineering system via consequent application of best practices, and feed-back of experiences together with proper consideration of WWER-440/V213 features are the decisive elements of ensuring the safety of long-term operation. That systematic engineering approach is in the focus of recent paper. Key elements of justification and measures for ensuring the safety of long-term operation of Paks NPP WWER-440/213 units are identified and discussed. These are the assessment of plant condition and review of adequacy of ageing management programmes, also the review, validation and reconstitution of time limited ageing analyses as core tasks of licence renewal.

• 한국항해항만학회지
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• 제32권5호
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• pp.369-377
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• 2008

최근 컨테이너선의 대형화 추세와 항만간의 경쟁 가속화로 인해 컨테이너터미널의 효율적 운영과 생산성 향상에 대한 관심과 노력이 증대되고 있다. 특히 YT를 이용한 이송방식을 채택하고 있는 터미널의 경우 AGV(Automated Guided Vehicle)를 이용하고 있는 자동화터미널에 비해 상대적으로 경제성 및 운용효율성 측면에서 불리한 것이 사실이다. 최근 10여 년간 이와 같은 YT운용의 비효율성을 보완하기 위해 YT Pooling Operation 도입과 같은 노력이 계속되어 왔으나 개별 YT의 위치인식기능부재로 인한 제약으로 실질적인 효과는 미미한 수준이었다. 본 연구에서는 최근 주목받고 있는 RTLS(Real Time Location System) 기술을 활용하여 기존 YT Pooling Operation의 제약사항을 해결하는 새로운 개념의 YT Dynamic Operation 모델을 세안한다.