• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.229-239
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• 2008

A Distributed File System (DFS) provides a mechanism in which a file can be stored across several physical computer nodes ensuring replication transparency and failure transparency. Applications that process large volumes of data (such as, search engines, grid computing applications, data mining applications, etc.) require a backend infrastructure for storing data. And the distributed file system is the central component for such storing data infrastructure. There have been many projects focused on network computing that have designed and implemented distributed file systems with a variety of architectures and functionalities. In this paper, we describe a complete distributed file system which can be used in large-scale search-oriented systems.

• Journal of Digital Contents Society
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• v.16 no.6
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• pp.927-934
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• 2015

IMO e-Navigation is ongoing project for safety navigation and protection of maritime environment. Maritime Cloud is a part of e-Navigation Strategy Implementation Plan. It is IT framework technology for exchanging information among maritime stakeholders. We found configuration and operation process by analysis on Maritime Cloud architecture and EPD which is a client program. Through the result, we actually implemented client program. Client program targets Berthing data serviced on AIS-ASM. And we used MMS which is function of message exchanging of Maritime Cloud. The test result show data exchanging succeeded. And it will be helpful to develop Maritime Cloud service, to advance Korean Maritime Cloud.

• The Journal of the Korea Contents Association
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• v.18 no.6
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• pp.564-573
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• 2018

External environment of enterprises are rapidly changing brought about mainly by global competition, cost and profitability pressures, and emerging new technology. In particular, frequent change of customer requirements is a tough challenge to manufacturing company. To cope with these challenges, a production planning and scheduling (PP&S) function might be established to provide accountability for both customer service and operational efficiency. PP&S deals with short-term decision making in the production process of whole supply chain. The task of PP&S is to seek a balance between customer orders and limited resources. At present, many PP&S software solutions have been utilized in many enterprises to generate a realistic production plan and schedule efficiently. The aim of this paper is to analyze the PP&S functionalities and its system architecture from the perspective of SCM (Supply Chain Management), and propose the PP&S solution classification framework to facilitate the comparison among various solutions.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.1453-1469
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• 2017

우리나라는 후발주자임에도 불구하고 개방형 운영체제의 전격적 채택과 고급 기종 중심의 공격적 제품 라인 확대, 그리고 가치사슬의 수직 통합 체계 구축 등에 힘입어 2011년 세계 스마트폰 시장 점유율 1위를 차지하였다. 그러나 우리나라 스마트폰 산업은 시장 점유율 1위를 달성한지 4년만인 2015년 또 다른 후발주자인 중국에 추격을 허용하였다. 이와 같은 스마트폰 산업 주도권 이전 현상을 논의하기 위해 본 연구는 추격 사이클 이론에 기반하여 중국 스마트폰 산업의 추격과 관련한 기술 수요적 정책 및 제도적 기회의 창을 고찰하고, 이에 대한 중국의 전략적 대응과 우리나라의 실책을 논의하였다. 먼저 기술적 기회의 창으로 스마트폰 아키텍처의 모듈화와 시스템 반도체의 원칩화는 스마트폰 생산에 필요한 기술적 지식의 장벽을 낮추는데 기여하였다. 또한 2013년부터 급성장하기 시작한 저가(190달러 이하) 스마트폰 시장은 기술적 열위인 중국의 시장 개척에 우호적 기회로 작용하였다. 이와 함께 중국 정부의 스마트폰 관련 연구개발 투자 확대는 중국에게 우호적 사업 환경을 제공하는 정책적 기회의 창으로 작용하였다. 이와 같은 기회의 창을 활용하기 위해 중국 스마트폰 산업은 빠른 시장 진입, 원가 절감을 위한 현지 부품 채용, 정부 연구개발 투자를 활용한 기술 역량 축적 등의 전략적 대응을 전개하였다. 반면 우리나라는 고급 기종 생산 고수와 저가 기종 출시 지연, 수직통합 체계의 고착화에 따른 부품 경쟁력 악화에 따라 중국에 추격을 허용하게 되었다. 본 연구는 산업 주도권 이전 현상에 대한 최신 실증을 추가함으로써 추격 사이클 이론의 발전에 기여할 것으로 기대되며, 향후 우리나라 스마트폰 산업 발전 정책 발굴에 중요한 지침으로 활용될 것으로 기대된다.

• Journal of the Korea Society for Simulation
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• v.24 no.4
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• pp.119-125
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• 2015

This research has conducted high availability system modeling to assure the reliability of shipboard combat systems. Shipboard combat system is a way for efficient execution of duty and a crucial battlefield management system that determines the outcome of battle in the modern war. Especially in regard to a network-centric operational environment in the future, even 1% of malfunction can lead to fatal consequences for the outcome of war. So combat system should be designed by high availability system which is a "always-on" service. In this point of view, This work describes an architecture-based various high availability model and proposed alternative high available systems that can achieve more than 99.9999% accuracy at a minimum. This paper also provides an applicable model with which system engineers analyze out system failure and recovery process by employing computerized tools.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.43 no.3
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• pp.68-76
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• 2020

In a series of recent launch tests, North Korea has been improving the firepower of its missiles that can target South Korea. North Korea's missiles and submarines are capable of threatening targets in South Korea and are likely faster and more covert than the systems previously seen in North Korea. The advanced threats require that ROK Navy should not only detect them earlier than ever but also response quicker than ever. In addition to increasing threats, the number of young man that can be enlisted for military service has been dramatically decreasing. To deal with these difficulty, ROK navy has been making various efforts to acquire a SMART warship having enhanced defense capability with fewer human resources. For quick response time with fewer operators, ROK Navy should improve the efficiency of systems and control tower mounted on the ship by promoting the Ship System Integration. Total Ship Computing Environment (TSCE) is a method of providing single computing environment for all ship systems. Though several years have passed since the first proposal of TSCE, limited information has been provided and domestic research on the TSCE is still in its infancy. In this paper, we apply TSCE with open architecture (OA) to solve the problems that ROK Navy is facing in order to meet the requirements for the SMART ship. We first review the level of Ship System Integration of both domestic and foreign ships. Then, based on analyses of integration demands for SMART warship, we apply real time OA to design architecture for TSCE from functional view and physical view. Simulation result shows that the proposed architecture has faster response time than the response time of the existing architecture and satisfies its design requirements.

• Journal of Information Technology and Architecture
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• v.10 no.1
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• pp.23-31
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• 2013

A rapid growth of IT convergence into different application areas draws a lot of interest in high performance platform and embedded system. Industry needs well educated computer professionals with the practical understanding on the emerging technologies and core issues of contemporary popular services. In this paper, we present an education framework for computer system architecture based on rigorous analyses of the characteristics of IT convergence services and information technology trends. The proposed framework puts emphasis on real-world and hands-on subjects related to multicore architecture, embedded system and parallel processing. We believe effective use in the development and management of computer system architecture courses encouraging both industries and students.

• The KIPS Transactions:PartD
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• v.15D no.4
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• pp.569-580
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• 2008

Web services are the current most promising technology for service oriented architecture(SOA) implementations. However, in spite of the large scale acceptance of web services, they have been relegated to internal integration projects, and the grand vision of virtual enterprises where partners can be integrated on demand is yet to be realized. The main reason is that the current standards of web services are not very suitable for the dynamic web service discovery and integration. In this paper, we present a novel SemanticBPEL solution that merges the benefit of WS-BPEL, with the advantage of OWL-S for building a semi-automatic web service composition system. In particular, this work proposes a multi-phase search method for solving dynamic discovery and integration problems of web services. The proposed method is compared with the existing keyword based retrieval method. These comparisons show that our approach outperforms the existing method.

• Journal of Digital Contents Society
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• v.19 no.1
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• pp.35-41
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• 2018

The Q-learning algorithm based on reinforcement learning is useful for learning the goal for one behavior at a time, using a combination of discrete states and actions. In order to learn multiple actions, applying a behavior-based architecture and using an appropriate behavior adjustment method can make a robot perform fast and reliable actions. Q-learning is a popular reinforcement learning method, and is used much for robot learning for its characteristics which are simple, convergent and little affected by the training environment (off-policy). In this paper, Q-learning algorithm is applied to a lamp robot to learn multiple behaviors (human recognition, desk object recognition). As the learning rate of Q-learning may affect the performance of the robot at the learning stage of multiple behaviors, we present the optimal multiple behaviors learning model by changing learning rate.

• The Journal of the Convergence on Culture Technology
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• v.3 no.1
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• pp.25-28
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• 2017

Although Korea's e-government is at the level of developed countries, it has been pointed out that the introduction of SOA is too slow. It also points out that the government's low SOA level has a negative impact on the UN's e-government rankings. In 2002, Korea introduced the first web service in the domestic public sector. At that time, there were few cases in the world where Web services were introduced in the public sector. However, the advanced e-government advanced countries already have SOA ideology based on e-government. Denmark and so on have SOA ideologies on the basis of e-government, and many countries make and use service repositories. In this environment, we analyze the application status of web service centered on the case of e - government in Japan.