• 센서학회지
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• 제32권1호
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• pp.62-65
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• 2023

The wave mode calculation of a large-scale optical system in comparison to the working wavelength is practically impossible because the computational cost increases exponentially. In this paper, we propose a method that can obtain the optical mode in a large-scale optical system. The method carries out simulations by dividing the calculation area into blocks and moving along the light axis along which the light propagates. By applying this method to the calculation of resonant modes in a ring-type optical resonator, which is mainly used for ring laser optical gyro sensors, the efficiency of the proposed method was verified.

• Korean Journal of Geomatics
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• 제1권1호
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• pp.7-13
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• 2001

Geospatial Information Systems (GIS) have been employed to systematically manage and design land use in urban areas. This has increased the need for more accurate vector and raster data. In Korea, l/l,000-scale digital maps are used as vector data for the facility management in urban areas. This has increased the need for large scale orthoimages. Orthoimages generated from aerial imagery can provide accurate information, making possible the more effective city management. However, there is a large problem in using the orthoimages, i.e., currently available conventional orthoimages have not been generated based on Digital Elevation Model (DEM) that takes into account the building heights. So this causes the displacements of building image in large scale orthoimages. The present study is an attempt to generate the large scale orthoimages based on building DEM. The semiautomatic building extraction method can detect building outlines by mouse clicking on either building roofs or corners. Building DEM, based on the outline and calculated building height, was used to produce the large scale orthoimages with the corrected building occlusion.

• 전자통신동향분석
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• 제38권5호
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• pp.23-33
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• 2023

With the widespread demand from data-intensive tasks such as machine learning and large-scale databases, the amount of data processed in modern computing systems is increasing exponentially. Such data-intensive tasks require large amounts of memory to rapidly process and analyze massive data. However, existing computing system architectures face challenges when building large-scale memory owing to various structural issues such as CPU specifications. Moreover, large-scale memory may cause problems including memory overprovisioning. The Compute Express Link (CXL) allows computing nodes to use large amounts of memory while mitigating related problems. Hence, CXL is attracting great attention in industry and academia. We describe the overarching concepts underlying CXL and explore recent research trends in this technology.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 하계종합학술대회 논문집
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• pp.112-115
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• 1989

This paper proposes a learning control algorithm for trajectory tracking of large scale system. The controller using only localized informations is composed of stabilizing controller and iterative learning controller. Stabilization and convergence of each subsystem is assured under some conditions which are inequalities of inter-connection terms and learning controller gain.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.291-298
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• 2006

A parallelized topology design optimization method is developed on a distributed memory system. The parallelization is based on a domain decomposition method and a boundary communication scheme. For the finite element analysis of structural responses and design sensitivities, the PCG method based on a Krylov iterative scheme is employed. Also a parallelized optimization method of optimality criteria is used to solve large-scale topology optimization problems. Through several numerical examples, the developed method shows efficient and acceptable topology optimization results for the large-scale problems.

• 한국컴퓨터정보학회논문지
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• 제25권10호
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• pp.51-58
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• 2020

DDS 디스커버리는 같은 도메인을 사용하고, 다른 노드에 존재하는 DDS 객체를 찾는 과정이다. 한 노드에서 DDS 디스커버리 과정이 실패한다면, DDS 디스커버리가 실패한 노드에서 정상적인 DDS 데이터 송수신이 불가능하여 시스템 운용에 큰 영향을 미칠 수 있다. 그렇기 때문에, DDS 디스커버리의 성능을 향상시켜 DDS 디스커버리 과정을 빠르게 완료하고, 네트워크 부하와 컴퓨터 자원 사용량을 줄여서 DDS 디스커버리가 실패할 수 있는 가능성을 줄일 수 있다면 전체 시스템의 성능 향상에 큰 영향을 줄 수 있다. 본 논문에서는 대용량 시스템에서 DDS 디스커버리 시간과 네트워크 부하, 컴퓨터 자원 사용량을 줄일 수 있는 성능 향상을 위한 새로운 방법을 제안하고, 시험을 통하여 제안한 방법의 효율성을 증명한다.

• KEPCO Journal on Electric Power and Energy
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• 제3권1호
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• pp.17-21
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• 2017

Recently, the Korea Enhanced Power system Simulator (KEPS) was upgraded with new processor cards and various peripheral devices. The purpose of the upgrade is for the large-scale AC/DC simulation studies for different purposes such as FACTS, PMU applications, and SPS. The need for such study is now growing in KEPCO network. Frequently, traditional ways of performing the necessary study had been found to be less adequate for guiding the key decisions in the company. Therefore, the growing needs, as well as the revealed inadequacy of the traditional system studies, had been attributing to the momentum for the upgrade project. This paper explains the details of the upgrade project. As an example of presenting the effectiveness of the upgraded RTDS system in KEPRI-KEPCO, a large-scale AC/DC real time simulation case which includes the entire Korean network and a planned MMC-HVDC system is introduced.

• International Journal of Control, Automation, and Systems
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• 제5권5호
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• pp.526-538
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• 2007

This paper presents a neural network based decentralized excitation controller design for large-scale power systems. The proposed controller design considers not only the dynamics of generators but also the algebraic constraints of the power flow equations. The control signals are calculated using only local signals. The transient stability and the coordination of the subsystem control activities are guaranteed through rigorous stability analysis. Neural networks in the controller design are used to approximate the unknown/imprecise dynamics of the local power system and the interconnections. All signals in the closed loop system are guaranteed to be uniformly ultimately bounded. To evaluate its performance, the proposed controller design is compared with conventional controllers optimized using particle swarm optimization. Simulations with a three-machine power system under different disturbances demonstrate the effectiveness of the proposed controller design.

• 한국실내디자인학회논문집
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• 제19권3호
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• pp.260-268
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• 2010

At a passenger terminal which is a core facility of a large-scale airport, users are not easy to recognize its space and to approach each facility by composition of large-scale space not recognized at a glance and arrangement of complicated functional space. Such a passenger terminal should be designed by putting a focus on functionality, safety and convenience since diverse passengers use it. At a passenger terminal, a lot of passengers' circulation followed by diverse purpose appear. Therefore, it needs a lot of functional space and space to satisfy passengers' demands. When circulation is planed, it should be designed by a systematic standard. The study was carried out on the basis of international airports, considering features and functions of airport circulation system. In kind of circulation in passenger terminal of an airport, there are user's circulation (passenger's circulation, employee's circulation and service circulation) and baggage circulation. The study examined passenger's circulation which was a major circulation of passenger terminal out of user's circulation. The study examined elements which had an effect on circulation system at a large-scale airport passenger terminal and basic data for an efficient circulation system standard of passenger terminal through case analysis of passenger terminal circulation systems at international airports.

• 경영정보학연구
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• 제14권1호
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• pp.1-19
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• 2012

일반적으로 대규모 정보시스템 개발 프로젝트는 장기간 진행되는 특징이 있어, 프로젝트의 위험관리에 대한 관심이 특히 더 중요하다. 특히 IS 프로젝트는 소프트웨어 개발 생명주기 중 이행단계에서 오픈을 위한 진행상태 점검 및 컷오버 진행여부에 대한 의사결정을 하는 작업활동을 가지게 되는데 대규모 IS의 경우 오픈 후 그 파급효과가 대체로 크기 때문에 컷오버 의사결정을 보다 신중히 내려야 할 필요가 있다. 이것은 프로젝트를 오픈 하기 위한 매우 중요한 작업이지만 기존 프로젝트들의 컷오버 의사결정은 대부분 다양한 세부영역별 지표로 관리하기 보다는 시스템이행, 어플리케이션이행, 데이터이행 관점에서 단순히 이행의 정상 여부에만 초점을 두고 관리되어 실질적인 오픈에 대한 객관적인 기준으로 삼기에는 부족한 면이 있었다. 이에 본 연구에서는 컷오버 의사결정 관리 지표를 기능완성도, 비기능완성도, 이행리허설 등 컷오버 단계에 직접적으로 연관이 있는 실질적인 상세 항목으로 구성된 지표를 제시하고 이를 적용한 실제 사례를 통하여 그 효과를 확인하고자 한다.