• The Journal of the Korea institute of electronic communication sciences
• /
• v.13 no.1
• /
• pp.29-34
• /
• 2018

The systems associated with the ESS never stop. It runs 24 hours everyday. The system must be managed to run. The ESS system should perform normally even if the power IT equipment fails or communication failure occurs. Therefore, there is a need for a system that actively addresses, manages and controls the high precision power data of the ESS, even if a variety of failures occur. I would like to propose a power management communication unit to cope with the occurrence of communication failure. This paper also includes an integrated management system that can perform micro grid site management, maintenance and monitoring for the ESS system connected with the solar power generation facility.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.8
• /
• pp.3358-3365
• /
• 2012

This paper presents a scheduling scheme for die casting processes considering power usage. The scheduling problem of a shift-based die casting process is represented by a linear programming (LP) model that maximizes the average efficiency of melting furnaces in regard of the usage of molten alloy, where the product quantities of each shift are used as primary variables. In this research, we propose a novel LP model that considers power usage of foundries. The developed LP model can derive product plans in which the expended power of a casting shift does not exceed a prescribed limit, while optimizing the efficiency of alloy usage. The simulation result of a case study demonstrates the superiority and applicability of the proposed scheme. This paper serves as a basic research on the role of foundries as an intelligent costumer in smart grid environment where the limit of power usage should be fulfilled.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.1
• /
• pp.172-182
• /
• 2008

Application Contents of based on a workflow process unit in grid system is a practical work to solve the problem. To construct cooperation environment is very important because the contents are deployed and executed. And the most of cooperation is executed by workflow. Globus toolkit is the middleware for cooperation process in grid environment. However the middleware only provides basic services for constructing grid, not workflow that can provides cooperation, job scheduling, application contents management. Also Globus toolkit is suitable for huge gird community but small size pc based grid community. Therefore, this paper proposes the efficient application contents deployment system for small sizes cooperation. This system supports efficient cooperation environment with Application contents deployment and resource management provided in grid community. Also it presents information and association relation among application contents with association dictionary among application contents based on workflow process unit, and utilizes this as information for application contents deployment.

• Journal of KIISE:Computer Systems and Theory
• /
• v.37 no.3
• /
• pp.127-137
• /
• 2010

As large-scale computational applications in various scientific domains have been utilized over many integrated sets of grid computing resources, the difficulty of their execution management and control has been increased. It is beneficial to refer job history generated from many application executions, in order to identify application‘s characteristics and to decide selection policies of grid resource meaningfully. In this paper, we apply a statistical technique, Plackett-Burman design with fold-over (PBDF), for analyzing grid environments and execution history of applications. PBDF design identifies main factors in grid environments and applications, ranks based on how much they affect to their execution time. The effective factors are used for selecting reference job profiles and then preferable resource based on the reference profiles is chosen. An application is performed on the selected resource and its execution result is added to job history. Factor's credit is adjusted according to the actual execution time. For a proof-of-concept, we analyzed job history from an aerospace research grid system to get characteristics of grid resource and applications. We built JARS algorithm and simulated the algorithm with the analyzed job history. The simulation result shows good reliability and considerable performance in grid environment with frequently crashed resources.

• Journal of the Korea Society of Computer and Information
• /
• v.17 no.1
• /
• pp.11-17
• /
• 2012

In recent years, there has been a popularity rose up on Smart TV (Smart Television) usage at home. Therefore, it is also have increase the demand on grid computing system. Smart TV has a variety of platform and usage compare to PC (Personal computer). Base on this, it is difficult to apply a traditional grid system on Smart TV. One major reason are concerning the small idle time compare to PC. To overcome this problem, this paper will propose a Javascript grid system and introducing a new scheduling policy that best suit for a smart TV. We have conduct an experiment on the proposed method. The result provides an average of 1.78 percent, which is improved compare to the traditional method which is only provides an average of 0.09 percent.

• The Journal of Korean Association of Computer Education
• /
• v.11 no.3
• /
• pp.81-89
• /
• 2008

The failure occurrence of resources in the grid computing is higher than in a tradition parallel computing. Since the failure of resources affects job execution fatally, fault tolerance service is essential in computational grids. And grid services are often expected to meet some minimum levels of quality of service (QoS) for desirable operation. However Globus toolkit does not provide fault tolerance service that supports fault detection service and management service and satisfies QoS requirement. Thus this paper proposes fault tolerance service to satisfy QoS requirement in computational grids. In order to provide fault tolerance service and satisfy QoS requirements, we expand the definition of failure, such as process failure, processor failure, and network failure. And we propose resource scheduling service, fault detection service and fault management service and show implement and experiment results.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06a
• /
• pp.433-435
• /
• 2006

P2P 그리드 컴퓨팅 환경에서 자원제공자가 수행한 연산 결과의 정확성을 보장하는 것은 중요한 고려사항이다. 기존의 연산 결과 검사에 대한 연구들은 중앙 서버가 연산 결과를 관리하는 중앙집중형 환경에서 이루어졌다. 그러나 중앙집중형 환경에서 중앙 서버의 부하로 인한 확장성 문제로 최근에는 분산형 환경에서 많은 연구가 진행 중이나 연산 결과 검사에 대한 연구는 없는 실정이다. 게다가 분산형 환경은 연산 결과를 관리하는 중앙 서버의 부재로 연산 결과를 신뢰하기 어렵고, 또한 검사하기도 어렵다. 이에 본 논문에서는 분산형 P2P 그리드 컴퓨팅 환경에서 자원제공자의 평판도 기반연산 결과 검사 기법을 제안한다. 제안 기법은 자원제공자의 가용성과 평판도를 기반으로 작업 트리를 구성한 후, 트리의 단계별 특징에 따라 차별화 된 연산 결과 검사와 스케줄링을 수행하여, 기존 연산 결과 검사 기법을 분산형 환경에 그대로 적용할 때보다 연산 결과의 정확성은 보장하면서 연산 결과 검사로 인한 부하는 감소시킨다.

• Journal of the Korea Society of Computer and Information
• /
• v.13 no.4
• /
• pp.31-37
• /
• 2008

In this paper, we propose a dynamic job relocation strategy that considering application's characteristics in multiple grid sites. This scheme classifies application to execute in multiple grid sites by their characteristics : computing intensive application, network intensive application. Also, it eliminates the communication between sites by allocating the network intensive application in single site, thus reducing the total job execution time. But if a number of free nodes to execute the network intensive application aren't found in single site, the proposed scheme the first allocates the network intensive application in multiple sites to minimize network latency. Then if the network intensive application being executed in multiple sites suitable free nodes are found in single site. the proposed scheme relocates the application being executed in multiple sites to another single site. This results in reducing the total job execution time. Through simulation, we show that the proposed dynamic job reallocation strategy improves the performance of Data Grid environment compared with previous strategies.

• Annual Conference of KIPS
• /
• 2016.10a
• /
• pp.833-834
• /
• 2016

최근 에너지 시장의 흐름은 공급위주에서 효율위주로 이동함에 따라 가정 내에서 스마트 그리드와 연동하고 태양광 및 에너지저장시스템을 활용한 에너지 관리 시스템 기술에 대한 연구와 개발이 활발히 진행되고 있다. 하지만 시중에서 판매되는 제품은 인터페이스를 갖추고 있지 않거나 제조사별 독자 프로토콜 사용으로 인한 기존 홍 네트워크와 호환성 문제를 가지고 있다 본 논문에서는 호환성 향상을 위한 SEP2.0 기반의 흉 에너지 관리 시스템 개발과 에너지 관리 스케줄링에 대해 기술하고자 한다.

• Annual Conference of KIPS
• /
• 2009.11a
• /
• pp.171-172
• /
• 2009

가상화 기술을 기반으로 하는 클라우드 컴퓨팅은 시스템 내에 존재하는 자원을 분할하여 이용하거나 독립적으로 존재하는 자원을 통합하는 측면에서는 매우 편리하고 용이하다. 또한 컴퓨팅 자원의 활용률을 극대화하는 이점도 존재한다. 하지만 가상화 기술 자체만으로는 사용자의 요청에 동적으로 가상화된 자원, 즉 가상 머신(Virtual Machine)을 생성, 복제, 할당 및 삭제 등의 관리 작업에 어려움이 존재한다. 따라서 본 논문에서는 Xen 과 Globus Toolkit 을 기반으로 구축된 환경에서 가상 머신의 관리를 편리하게 처리할 수 있는 가상 머신 매니저를 그리드 서비스로 설계 및 구현하였다. 또한 사용자의 요청을 효율적으로 처리하기 위해 작업과 자원에 대한 실시간 스케줄링 방법을 제안한다.