• Journal of Information Technology Services
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• v.7 no.3
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• pp.87-95
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• 2008

The Law of effective building and operation for the information systems took effect at Dec. 2005. Every government and public agency have to build own enterprise architecture(EA), sometimes it's called the Information Technology Architecture(ITA), by this law. The Ministry of National Defense(MND) built the enterprise architecture(EA) during 2006. 12$\sim$2007. 11 by this law too. We knew the specific characters of the public sector thru the EA project. The public sector is less active than commercial sector and most members of the public sector are just looking on the project as a spectator. So the most of key for the success of EA is how to catch the Sponsorship and Participation of members. In this paper we propose the effective building methodology for the Enterprise Architecture of public agency applying the MND-EA. The other governments and public agencies can build own the EA easily by the proposed methodology.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.7
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• pp.337-345
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• 2006

This paper proposes a high speed SRM drive system for blower application with a new 4-level inverter and precise excitation position generator. For a high speed blower, a proper inverter and control method are proposed and the output characteristics are analyzed. In order to get a fast build-up and demagnetization of excitation current, a 4-level inverter system is proposed. The proposed 4-level inverter has additional charge capacitor, power switch and diode in the conventional asymmetric converter. The charged high voltage is supplied to the phase winding for fast current build-up, and demagnetization current is charged to additional capacitor of the 4-level inverter. In addition, a precise excitation position generator can reduce turn-on and turn-off angle error according to sampling period of digital control system. The proposed high speed SRM drive system is verified by computer simulation and experimental results.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10c
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• pp.276-278
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• 1998

근래 1,2년을 사이로 국내에서도 workflow system에 대한 인식이 높아지고, 실제 업무에 도입하려는 시도가 이루어지고 있다. 그러나, 아직까지는 실험적인 단계이며, 실질적인 적용까지는 시간이 필요할 것이라고 생각된다. 대신에 국내에서는 전자결재 시스템이 많이 사용되고 있다. 한편, workflow system은 비즈니스 process의 정의가 build time에 이루어지고 run time에는 그 정의에 따라 수행되는 방법이 일반적인데, 이런 방식이 주는 단점은 초기 build time에 process에 대한 이해가 부족한 상태에서 process가 정확하게 정의되기 어렵다는 점과, process의 유연성이 부족하다는 점, know-how를 잃어버리기 쉽다는 점 등이다. 따라서, 본 논문에서는 incremental approval방식이 유리하다고 주장한다. 한국의 기업환경과 실정의 고려해 볼 때 더욱 그렇다고 주장한다. 또, 전자결재 시스템과 workflow system의 유사점과 차이점을 분석하고 현재의 전자결재 시스템을 이용하면, workflow system의 incremental approval을 위한 prototype이 개발될 수 있다고 주장한다.

• Journal of the Korean Professional Engineers Association
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• v.39 no.1
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• pp.43-49
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• 2006

How do we build our future society for next 20 years? Such a country as Korea having only human resources, that was coupled with country's growth potential from the agronomical to the manufacturing industrial in the past decades, is entering into era of information society backed by knowledge - based industry as a country as a country with one of the maost advanced information technology markets in the world, playing a key driving force for Korean economy with the development of IT, BT, ITS. UT and e-construction which are this country's top strategic industries leading to a build-up of New Korea through those technological innovations being the essential in everyone's living for next 20 years.

• Journal of Korea Society of Digital Industry and Information Management
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• v.8 no.4
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• pp.143-149
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• 2012

MANET is a network that is a very useful application to build network environment in difficult situation to build network infrastructure. But, nodes that configures MANET have difficulties in data retrieval owing to resources which aren't enough and mobility. Therefore, caching scheme is required to improve accessibility and availability for frequently accessed data. In this paper, we proposed a technique that utilize mobility prediction of nodes to retrieve quickly desired information and improve data availability. Mobility prediction of modes is performed through distance calculation using location information. We used technique which global cluster table and local member table is managed by cluster head to reduce data consistency and query latency time. We compared COCA and CacheData and experimented to confirm performance of proposed scheme in this paper and efficiency of the proposed technique through experience was confirmed.

• Management Science and Financial Engineering
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• v.11 no.3
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• pp.1-17
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• 2005

Agent technology has been widely applied in today's electronic business, such as mobile agents, multi-agent information systems, etc. In particular, multi-agent systems have been applied as powerful simulation tools to study complex business networks composed of various self-interested trading firms and/or human beings. In this paper, we build an integrated model that consists of a multi-agent B2C market model and a B2B trade network model, and incorporate more reality than much of prior work. Then with this model, we carry out experimental studies on two different strategies that are common in electronic business - 'loyal' strategy (retailers try to build stable cooperation with suppiers to ensure material supply) and 'cost-saving' strategy (retailers try to reduce cost by choosing suppliers with lower wholesale price).

• Korean Management Science Review
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• v.26 no.1
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• pp.113-126
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• 2009

By the newly emerging network access technology, we face the new heterogeneous network environment. Focusing on the co-existence of multiple access network technology and the complex service needs of users, the wireless service operators should present the stable service quality for every user. For this, the service operators should build the new operation framework which combine the pre-established network and newly adopted one. Our problem is finding the optimal heterogeneous network operation framework. We suggest market-based marginal cost function for evaluating the relative value of resource of each network and develop the whole new heterogeneous network operation framework. To test the applicability of developed operation framework, we build large-scale JAVA simulator. By this development, we can easily test the new network environment in practical engineering field.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2005.10a
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• pp.251-254
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• 2005

The flow forming has been used to produce long thin walled tube parts, with reduced forming load and enhanced mechanical and surface quality for a good finished part compared with other method formed parts. So flow forming technique is used widely in industrial production. Especially spinning and flow farming techniques an used frequently in automotive, aerial, defense industry. In this paper, FEM analysis of three-roller backward flow forming of a workpiece is carried out to study effects of forming depth and feed rate on forming force. The axial and radial forces on several forming depth and feed rate conditions are obtained. The phenomena such as bell mouth, build up and bulging during simulation are observed as well.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.89-92
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• 2002

As the use of Internet being generalized, ordering system can be easily achieved on the Web so that the direct sailing system is replaced the various types of Built-To-Order system. It is important to give the up-to-date information to the end-user in order to build the Built-To-Order system. Recently, the way of providing information is updating the product related information continuously. In this study, we provide the method that can be streamlined Product Data Management System which manages a creation and update for product information into the direct BTO system in order to achieve the newest information. This methodology is not only transferring the information but also processing the information in an appropriate form. So this paper is going to cover the various point of view of information processing.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.101-104
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• 2002

Leading companies have embraced the new economy with new and innovative BTO models. Instead of conventional company-oriented manufacturing scheduling, customer-oriented scheduling method attracts more and more attention. To evaluate the delivery of customer order in advance, the real production capacity as well as procurement lead time should be taken into account. This paper describes a quasi-real-time order delivery estimation system using TOC(Theory of Constraints) based scheduling method.