• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.04a
• /
• pp.385-388
• /
• 2002

그리드 컴퓨팅 환경을 이용하여 인터넷을 통해 프로세스를 원격에서 수행, 결과를 전달받을 수 있다. 기존의 프로세스 원격수행 모델은 다음과 같은 조건을 필요로 한다. 첫째, 해당 프로그램 또는 객체가 원격 컴퓨터에 존재하여야 하거나, 클라이언트와 서버관계를 설정하는 미들웨어가 요구된다. 둘째, 원격 프로그램 수행요청을 받아들이는 어플리케이션 또는 미들웨어가 미리 존재하여야 한다. 그러나 이와 같은 필요조건은 그리드 컴퓨팅 환경을 통해 계산자원을 동적으로 확장시키는데 사용되는 것을 제약한다. 본 논문에서는 이러한 필요조건 없이 원격 수행을 가능케 하는 프로세스 원격 수행 모델과 펑션 메시지를 활용하여 원격 계산자원을 동적으로 획득하는 방법을 제시한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.21 no.3
• /
• pp.7-14
• /
• 2021

The emergence of the automated smart grid has become an essential device for responding to these problems and is bringing progress toward a smart grid-based society. Smart grid is a new paradigm that enables two-way communication between electricity suppliers and consumers. Smart grids have emerged due to engineers' initiatives to make the power grid more stable, reliable, efficient and safe. Smart grids create opportunities for electricity consumers to play a greater role in electricity use and motivate them to use electricity wisely and efficiently. Therefore, this study focuses on power demand management through machine learning. In relation to demand forecasting using machine learning, various machine learning models are currently introduced and applied, and a systematic approach is required. In particular, the GP learning model has advantages over other learning models in terms of general consumption prediction and data visualization, but is strongly influenced by data independence when it comes to prediction of smart meter data.

• Journal of the Korea Society for Simulation
• /
• v.16 no.2
• /
• pp.1-8
• /
• 2007

Resource management in grid computing environment is essential for integration and interaction among heterogeneous resources. This paper discusses resource management methods of centralized and decentralized broker-based modeling for solving complex problems of resource management and presents design and development of the decentralized broker-based resource management modeling in grid computing environment. This model comprises a global resource broker and a local resource broker, and we derive reduction of communication and functional dispersion of Job management using a local resource broker. The simulation experiment shows the improvement of resource utilization and average response time and proves that this model improves utilization of resources and replies to user requests promptly.

• Journal of Digital Convergence
• /
• v.11 no.11
• /
• pp.37-52
• /
• 2013

Prior to full-scale implementation of smart grid, the Korean government is conducting a smart grid testbed in Jeju island. However, the participants of the ongoing program are skeptical about the success of the expansion of smart grid. The concern rises from various reasons; the limits of the Korean electricity market mainly led by both the government and KEPCO, high stability and reliability of the existing electricity grid, insufficient utilization of renewable energy, and public fear of raised electricity bills. Five key issues in regards to facilitating the Korean smart grid market are extracted and evaluated. The issues are conflict of interest among participants, the effect of introducing real-time pricing, lack of customer participation of demand response, and absence of business models.

• The KIPS Transactions:PartD
• /
• v.11D no.5
• /
• pp.1011-1020
• /
• 2004

A lot of work has been done to improve the I/O performance of such a system that store and manage a massive amount of data by distributing them across multiple disks and access them in parallel. Most of the previous work has focused on an efficient mapping from a grid ceil, which is determined bY the interval number of each dimension, to a disk number on the assumption that each dimension is split into disjoint intervals such that entire data space is GRID-like partitioned. However, they have ignored the effects of a GRID partitioning scheme on declustering performance. In this paper, we enhance the performance of mapping function based declustering algorithms by applying a good GRID par-titioning method. For this, we propose an estimation model to count the number of grid cells intersected by a range query and apply a GRID partitioning scheme which minimizes query result size among the possible schemes. While it is common to do binary partition for high-dimensional data, we choose less number of dimensions than needed for binary partition and split several times along that dimensions so that we can reduce the number of grid cells touched by a query. Several experimental results show that the proposed estimation model gives accuracy within 0.5% error ratio regardless of query size and dimension. We can also improve the performance of declustering algorithm based on mapping function, called Kronecker Sequence, which has been known to be the best among the mapping functions for high-dimensional data, up to 23 times by applying an efficient GRID partitioning scheme.

• Journal of Internet of Things and Convergence
• /
• v.10 no.1
• /
• pp.1-6
• /
• 2024

In order to increase the use of electric vehicles (EVs) and minimize grid strain, microgrid using renewable energy must take an important role. Microgrid may use fossil fuels such as small diesel power, but in many cases, they can be supplied with energy from renewable energy, which is an eco-friendly energy source. However, renewable energy such as solar and wind power have variable output characteristics. Therefore, in order to meet the charging and discharging energy demands of electric vehicles and at the same time supply load power stably, it is necessary to review the configuration of electric vehicle charging infrastructure that utilizes diesel power or electric vehicle-to-grid (V2G) as a parallel energy source in the microgrid. Against this background, this study modelized a microgrid that can stably supply power to loads using solar power, wind power, diesel power, and V2G. The proposed microgrid uses solar power and wind power generation as the primary supply energy source to respond to power demand, and determines the operation type of the load's electric vehicles and the rotation speed of the load synchronous machine to provide stable power from diesel power for insufficient generations. In order to verify the system performance of the proposed model, we studied the stable operation plan of the microgrid by simulating it with MATLAB /Simulink.

• Information and Communications Magazine
• /
• v.30 no.2
• /
• pp.51-58
• /
• 2013

글로벌 기후변화 및 에너지 고갈 문제가 전(全) 지구적 이슈로 부각됨에 따라 다양한 그린 에너지기술에 대한 연구가 활발하게 진행되고 있고, 기존 주력 기술분야와 정보통신기술과의 융합을 통한 새로운 기술개발이 활발하게 추진되고 있다. 스마트그리드 기술은 이러한 패러다임에서 탄생한 기술 분야이며, 녹색 기술의 대표적인 기술 사례로 분류되고 있다. 스마트그리드에 대한 개념이 국내에 도입된 이후 기술 개발 성과 실증과 비즈니스 모델을 발굴하고자 시작되었던 제주 스마트그리드 실증단지 구축 사업도 금년 5월을 기점으로 완료될 예정이다. 스마트그리드 실증단지 구축을 통해 소비자 도메인에서의 다양한 에너지관리 솔루션 구축 방법에 대하여 확인할 수 있는 기회도 되었으나 표준화 기반의 상호운용성이 확보되지 않아 컨소시엄 간의 시스템 연동이 어려운 문제도 확인할 수 있었다. 스마트그리드는 보다 강건하고 신뢰성 있는 전력시스템의 현대화 및 지능화를 위하여 ICT(Information and Communication Technology) 기술을 활용하는 것이 필요하며, 전력공급자와 소비자 사이의 양방향 전력 및 정보의 실시간 교환 특성을 활용하여 에너지를 효율적으로 사용하도록 하는 시스템의 도입이 무엇보다 중요하다. 2011년 9/15 순환정전 사태는 전력공급 정책과 더불어 전력 소비자에 대한 관리 기능도 함께 검토되어야 한다는 것을 다시 한 번 크게 인식할 수 있는 계기가 되었다. 본 고에서는 이러한 중요성을 가지는 소비자 분야를 중심으로 한 스마트그리드 ICT 기술에 대하여 일부 주요 사항을 발췌하여 정리해 보고자 한다. 이를 위하여 스마트그리드의 전체적인 현황, 소비자 도메인에서의 스마트그리드 요소기술 및 ICT 기술의 핵심이 되는 소비자 도메인에서 사용되는 통신 기술을 중심으로 소비자 도메인 ICT 기술에 대하여 정리해 보고자 한다.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.44 no.12
• /
• pp.37-42
• /
• 2007

Clock grid networks are now common in most high performance microprocessors. This paper presents a new effective modeling and simulation methodology for the clock grid using scattering parameter. It also shows the effect of wire width and grid size on the clock skew of the grid. The interconnection of the clock grid is modeled by RC passive elements. The results show that the error is within 10 % comparing to Hspice simulation results.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.348-349
• /
• 2011

전력계통해석 중 전력조류계산과 안정도 해석에서 부하모델이 필요하다. 부하모델을 만드는 방법 중 미시적 방법에 의한 부하모델 방법은 몇 개의 부하군으로 분류하고, 전압, 주파수 변화에 따른 특성 실험에 의해 부하군의 개별부하 모델을 구축하고 각 부하군이 시간별 구성 비율을 이용하면 합성된 부하모델을 얻을 수 있다. 이 ��, 부하구성비 추정이 필요로 하게 된다. 본 논문에서는 스마트그리드 환경에서 구성될 새로운 주택모습과 그 안에 구성될 부하기기를 추론하고, 10년전에 이루어 졌던 부하모델 방법의 부하구성비와 스마트 그리스환경에서 구성될 새로운 주택의 부하구성비를 비교함으로써 부하모델을 10년 주기로 새로 예측해야 할 이유에 대해 서술하도록 한다.

• Journal of Korean Society of Steel Construction
• /
• v.23 no.2
• /
• pp.211-220
• /
• 2011

The diagrid structure is now one of the trends in tall-building structures. It is preferred not only because of its distinctive appearance but also because of its structural advantages. There are few diagrid buildings that actually exist, however, because of the nodes, which are difficult to make and cost too much. In this study, a node-type diagrid building material with a more efficient structure but with fewer diagrid nodes, fabricated using the finite element method, was proposed and validated via experimentation.