• Journal of Korea Society of Industrial Information Systems
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• v.16 no.1
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• pp.49-58
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• 2011

Among the various ERP solutions, SAP R/3 solution has been chosen because SAP system follows global standard processes which include most of business solutions for various industries. The ERP education is limited by learning theory only and they are not sufficient for understanding wide scale of business processes. Real world scenarios with hands on experience approach will be the core aspect of this article. As per real world scenarios, "ChungBuk Motors. Corp." has been created and students are asked to create the organization structure and the procurement process for this virtual enterprise. As a result, students attending this class showed better understanding of overall ERP system comparing to the students attended other ERP classes. The hands-on experience with real-world scenarios proved that it is most practical and efficient solution for educating ERP system.

• Journal of the Korean Society of Propulsion Engineers
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• v.11 no.4
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• pp.26-37
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• 2007

A virtual engine test based on "Numerical test cell" can extremely reduce the time and cost for the development of a hardware by coupling multidisciplinary analysis. This paper introduces the development activities of full engine simulation programs in U.S.A. and Europe, with the their related techniques(the engineering models, the simulation environment and high performance computing) based on the NPSS(Numerical Propulsion System Simulation). NASA Glenn research conte. leads the development efforts of NPSS by assembling the current codes and improving their Auctions. VIVACE(Value Improvement through a Virtual Aeronautical Collaborative Enterprise), a consortium of universities, research centers and companies in Europe, is developing the PROOSIS(PRopulsion Object Oriented Simulation Software). The capability for the domestic development is also estimated by surveying the current status.

• International Journal of Internet, Broadcasting and Communication
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• v.15 no.4
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• pp.270-278
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• 2023

We propose a container orchestration system for process workloads that combines the potential of big data and machine learning technologies to integrate enterprise process-centric workloads. This proposed system analyzes big data generated from industrial automation to identify hidden patterns and build a machine learning prediction model. For each machine learning case, training data is loaded into a data store and preprocessed for model training. In the next step, you can use the training data to select and apply an appropriate model. Then evaluate the model using the following test data: This step is called model construction and can be performed in a deployment framework. Additionally, a visual hierarchy is constructed to display prediction results and facilitate big data analysis. In order to implement parallel computing of PCA in the proposed system, several virtual systems were implemented to build the cluster required for the big data cluster. The implementation for evaluation and analysis built the necessary clusters by creating multiple virtual machines in a big data cluster to implement parallel computation of PCA. The proposed system is modeled as layers of individual components that can be connected together. The advantage of a system is that components can be added, replaced, or reused without affecting the rest of the system.

• Journal of Internet of Things and Convergence
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• v.9 no.1
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• pp.71-76
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• 2023

Recently, in order to store and manage big data, research and development of a high-performance storage system capable of stably accessing large data have been actively conducted. In particular, storage systems in data centers and enterprise environments use large amounts of SSD (solid state disk) to manage large amounts of data. In general, SSD uses FTL(flash transfer layer) to hide the characteristics of NAND flash memory, which is a medium, and to efficiently manage data. However, FTL's algorithm has a limitation in using DRAM more to manage the location information of NAND where data is stored as the capacity of SSD increases. Therefore, this paper introduces FTL policies that apply virtual memory to reduce DRAM resources used in FTL. The virtual memory-based FTL policy proposed in this paper manages the map data by using LRU (least recently used) policy to load the mapping information of the recently used data into the DRAM space and store the previously used information in NAND. Finally, through experiments, performance and resource usage consumed during data write processing of virtual memory-based FTL and general FTL are measured and analyzed.

• The Journal of Society for e-Business Studies
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• v.12 no.3
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• pp.1-17
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• 2007

A virtual enterprise (VE) can be mapped into a multi-agent system (MAS) that consists of various agents with specific role(s), communicating with each other to accomplish common goal(s). However, a MAS for enacting VE requires more advanced mechanism such as context that can guarantee autonomy and dynamism of VE members considering heterogeneity and complex structure of them. This paper is to suggest a context-based MAS as a platform for constructing and managing virtual enterprises. In the Context-based MAS a VE is a collection of Actor, Interaction (among Actors), Actor Context, and Interaction Context. It can raise the speed and correctness of decision-making and operation of VE enactment using context, i.e., information about the situation (e.g., goal, role, task, time, location, media) of Actors and Interactions, as well as simple data of their properties. The Context-based MAS for VE we proposed('VECoM') may consists of Context Ontology, Context Model, Context Analyzer, and Context Reasoner. The suggested approach and system is validated through an example where a VE tries to find a partner that could join co-development of new technology.

• Radiation Oncology Journal
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• v.17 no.1
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• pp.78-83
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• 1999

Purpose : We have compared the characteristics of Siemens virtual wedge device with physical wedges for clinical application. Materials and Methods : We investigated the characteristics of virtual and physical wedges for various wedge angles (15, 30, 45, and 60$^{\circ}$) using 6- and 15MV photon beams. Wedge factors were measured in water using an ion chamber for various field sizes and depths. In case of virtual wedge device, as upper jaw moves during irradiation, wedge angles were estimated by accumulated doses. These measurements were performed at off-axis points perpendicular to the beam central axis in water for a 15cm${\times}$20cm radiation field size at the depth of loom. Surface doses without and with virtual or physical wedges were measured using a parallel plate ion chamber at surface. Field size was 15cm H20cm and a polystyrene phantom was used. Results : For various field sizes, virtual and physical wedge factors were changed by maximum 2.1% and 3.9%) , respectively. For various depths, virtual and physical wedge factors were changed by maximum 1.9% and 2.9%, respectively. No major difference was found between the virtual and physical wedge angles and the difference was within 0.5$^{\circ}$ . Suface dose with physical wedge was reduced by maximum 20% (x-ray beam :6 MV, wedge angle:45$^{\circ}$, 550: 80 cm) relative to one with virtual wedge or without wedge. Conclusions : Comparison of the characteristics of Siemens virtual wedge device with physical wedges was performed. Depth dependence of virtual wedge factor was smaller than that of physical wedge factor. Virtual and physical wedge factors were nearly independent of field sizes. The accuracy of virtual and physical wedge angles was excellent. Surface dose was found to be reduced using physical wedge.

• Proceedings of the CALSEC Conference
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• 1998.10a
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• pp.69-78
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• 1998

SGML/XML 기반 문서 정보 시스템의 문서 포맷은 인간이 비교적 쉽게 이해할 수 있으며 기존의 문서 정보 시스템에서는 접근 불가한 레벨까지 인간이 접근할 수 있는 통로를 제공한다. 또한, 문서처리 관점에서 보면 기존의 각 CAL/EC관련 응용 프로그램에서 생성된 데이터는 문서 또는 파일 단위의 접근으로 업무레벨에 도움을 주는 것이 제한적인 것에 반해 SGML/XML 기반 문서정보 시스템은 DTD(Document Type Definition)에서 설계된 엘리먼트, 속성, 엔티티 등의 단위까지 접근할 수 있는 Mechanism으로 기존의 문서 정보 시스템과 차별화 되는 지식 매체로서 지식기반 시스템의 하부 프레임워크를 제공한다. SGML/XML 기반 문서 정보 시스템의 요소로서 SGML/XML 문서 정보 검색 시스템은 표현된 계층적 논리정보를 이용하여 다양한 문서 접근점을 제공할 수 있으며, 사용자 요구에 적합한 문서의 재사용 및 동적인 문서제시를 가능하게 한다. 또한, SGML/XML 문서 정보 관리 시스템은 공동 저작을 위한 세부 논리적 단위별 check-in/check-out, 액세스 제어, 버전닝 기능 등을 제공하여 기업 내 자산 관리를 위한 새로운 파라다임을 제공한다. 본 논문에서는 구현 사례와 더불어 SGML/XML 기술이 CALS/EC 추진에 주는 영향과 향후 바람직한 CALS/EC 또는 가상기업(Virtual Enterprise)구축을 위한 기술적 방향에 대해 논한다.

• Proceedings of the Society of Korea Industrial and System Engineering Conference
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• 2002.05a
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• pp.105-111
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• 2002

Presented is a Genetic Algorithm(GA) for dynamic partitioning an ATM LANE(LAN Emulation) network. LANE proves to be one of the best solutions to provide guaranteed Quality of Service(QoS) for mid-size campus or enterprise networks with a little modification of legacy LAN facilities. However, there are few researches on the efficient LANE network operations to deal with scalability issues arising from broadcast traffic delivery. To cope with this scalability issue, proposed is a decision model named LANE Partitioning Problem(LPP) which aims at partitioning the entire LANE network into multiple Emulated LANs(ELANs), each of which works as an independent virtual LAN.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.10a
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• pp.155-161
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• 2001

Federated process framework is introduced responding to market\\`s needs to gain benefits of process information sharing in a virtual enterprise. The framework is verified by implementing its prototype system. However, it is very difficult to integrate developed prototype system with operating legacy systems to show its applicability. Thus, a test bed approach is widely adopted to provide a system environment that imitates the operations of real legacy systems and their interactions. In this paper, we described implementation detail of test bed imitating the real-world workflow systems. We also show its contribution and results of the prototype system that was implemented on the test bed.

• Proceedings of the CALSEC Conference
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• 1999.07b
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• pp.549-554
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• 1999

기업 환경이 글로벌화 됨에 따라 다수의 기업들이 하나의 공동 프로젝트를 수행 하기 위해 인터넷 등의 통신 네트웍을 통해 기업 간 데이터 등을 교환 및 공유하여 하나의 기업이 업무를 수행하는 것과 같은 유기적인 비즈니스 프로세스를 지원하는 가상 협업(Collaboration) 환경의 중요성이 날로 강조되고 있으며, 이러한 환경을 가상 기업(Virtual Enterprise)이라 한다. CALS는 가상 기업을 구축하기 위한 핵심 기술로써 이질 분산 데이터의 공유 환경을 제공하기 위한 여러 형태의 요소 기술들을 정의하고 있다. 본 논문에서는 여러 기업들 사이에서 데이터를 공유하기 위한 기반 기술인 CALS 표준 데이터 공유 서버에 대해 살펴본다. 특히, CALS 환경에서 주목하고 있는 SGML, STEP 등의 표준 데이터를 공유하기 위해 필요한 분산 객체 기반 서버 컴포넌트에 대해 논한다. 마지막으로 CALS 표준 데이터 공유 서버를 응용하여 기업간의 문서 공유 시스템을 개발하여 본 시스템의 유효성을 검증한다.