• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.32-33
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• 2006

현재 변전소 자동화의 국제 표준으로 대두되고 있는 IEC61850은 스테이션 버스뿐만 아니라 프로세서 버스까지도 표준화된 통신기술을 채용하였고 자동화에 필요한 모델을 제시하였다. 본 연구에서는 프로세서 버스의 대표적인 장비인 Merging Unit의 특성과 구현에 필요한 기술을 고찰하였다. 특히 정밀한 시간동기에 필요한 GPS(Global Positioning System)를 이용한 동기화 기술에 대하여 고찰하였다. 이와 더불어 IEC61850-9-2 SV(Sampled Value) 서비스를 분석하고 실제로 마이크로프로세서를 이용하여 Merging Unit에 대한 설계를 수행하였다. 제안된 Merging Unit의 성능을 검증하기 위해서 전송된 SV 데이터를 시간 정보를 기준으로 재구성할 수 있는 오실로그래피(Oscillography)를 위한 플레이백(Playback) 프로그램을 제작하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.8
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• pp.41-47
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• 2009

The power IT project "Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology", is going on how to perform the verification of a IEC 61850 based Merging Unit for development of the full Substation Automation system from station bus to process bus. the testing method that this paper suggests, is including the conformance testing of IEC 61850 communication services and transmission functions of digital sampled values such as current and voltage, and referring to IEC 61850 conformance testing of IED. And finally, the paper shows a test system for the Merging Unit.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.253-255
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• 2008

병합장치(merging unit: MU)는 변류기(CT)와 변성기(VT)로부터 계측된 전류와 전압을 이더넷을 통해 샘플값(sampled value: SV) 메시지를 전송하는 IED이다. 본 논문에서는 병합장치(MU)의 통신 성능 테스트하기 위한 시스템을 구축하는 방법을 제시하였다. RTDS를 이용하여 계통을 모의하고 샘플값 메시지를 지원하는 과전류계전(OCR) IED를 구축 한 후 계통에 모의 고장을 통해 CB를 동작시킴으로서 성능을 확인하였다. 또한 상용 IED를 연결하여 CB 동작 테스트를 통해 구축한 통신 테스트 시스템의 상호운용성을 확인하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.7
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• pp.1177-1182
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• 2007

Recently, IEC61850 supports the standardized communication technique in both station bus and process bus, and presents the substation automation model. In this paper, we propose the required techniques to develop the Merging Unit (MU), which is one of the important data acquisition equipment in substation automation, under IEC61850 communication protocol. Especially, we also propose the precision time synchronization technique using GPS(Global Positioning System) for the MU. IEC61850-9-2 SV (Sampled Value) service is applied to the MU which is designed using microprocessor. In order to evaluate the performance of the proposed MU, the playback program, which can reconstruct the transmitted sampled value data on the basis of time information, is developed and the performance of the IEC61850 SV service for MU is verified experimentally.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.57 no.1
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• pp.30-35
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• 2008

In this paper, the application of power Quality monitoring based on Sampled Value(SV) which is introduced in the IEC61850 International Standard for substation communication are discussed. Firstly, while Merging Unit(MU) is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are encountered. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests less time-critical service compared to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. Lastly, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.56 no.1
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• pp.13-18
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• 2007

In this paper, authors deal with an application of power quality monitoring using the Sampled Value which is described in the IEC61850 International Standard for substation communication. Firstly, while Merging Unit is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are issued. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests non time critical service comparing to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. At last, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit. With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

• The Transactions of the Korea Information Processing Society
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• v.7 no.12
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• pp.3986-3994
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• 2000

A multiple vector reductive processing occurs during the vector inner product operation ([C] = [A] $\bigodot$,$\square$ [B]) and proceeds at the hardware dyadic pipeline unit. Every scalar result has to be generated with the component merging delay time in the multiple vector reduction($\bigodot$). In this paper we propose a new design method by which the component merging time could be eliminated from the multiple reduction and the scalar results from the reduction($\bigodot$) could be generated nearly in the almost same condensed time as the input components are fel>ded in the dyadic pipeline unitlo) or the output components are drained out of the dyadic pipeline unit($\square$), so called a dedicated chained pipeline unit for only a inner product operation.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.4
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• pp.303-310
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• 2008

Recently, IEC 61850 supports the standardized communication technique in both station bus and process bus, and presents substation automation model. In order to implement the IEC 61850 based communication in a substation using the MU (merging unit) which is one of the important data acquisition equipments in substation automation, the time synchronization is demanded for cooperative operation between the devices. This paper proposes the precision time synchronization technique using IRIG-B protocol to develop the MU under IEC 61850 communication protocol. The proposed technique is implemented and its performance is verified experimentally.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.9
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• pp.4386-4404
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• 2016

Most existing salient object detection algorithms commonly employed segmentation techniques to eliminate background noise and reduce computation by treating each segment as a processing unit. However, individual small segments provide little information about global contents. Such schemes have limited capability on modeling global perceptual phenomena. In this paper, a novel salient object detection algorithm is proposed based on region merging. An adaptive-based merging scheme is developed to reassemble regions based on their color dissimilarities. The merging strategy can be described as that a region R is merged with its adjacent region Q if Q has the lowest dissimilarity with Q among all Q's adjacent regions. To guide the merging process, superpixels that located at the boundary of the image are treated as the seeds. However, it is possible for a boundary in the input image to be occupied by the foreground object. To avoid this case, we optimize the boundary influences by locating and eliminating erroneous boundaries before the region merging. We show that even though three simple region saliency measurements are adopted for each region, encouraging performance can be obtained. Experiments on four benchmark datasets including MSRA-B, SOD, SED and iCoSeg show the proposed method results in uniform object enhancement and achieve state-of-the-art performance by comparing with nine existing methods.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.5 s.335
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• pp.5-12
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• 2005

Establishment of bandwidth and effective traffic processing are required to treat various traffics according to a rapid increase in Internet traffic. A wavelength based transferring method was introduced to support a broadband bandwidth according to this requirement, and consequently, a label processing procedure has been investigated to treat various traffics. This paper introduces a regular shape of stack structure in order to solve the present MPLS label stack processing unit, and analyzes the relationship to label merging, which is initiated between label merging inside and outside the LSP tunnel. By applying an adaptive label structure and merging point a hierarchical label, which is aroused in the GMPLS, can be uniformly simplified and improved from the perspective of cost and processing time at a node