• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.170-175
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• 2008

The research team for the virtual construction development was established with the support of Korea Ministry of Construction and Transportation, and KICTEP (Korea Institute of Construction and Transportation Technology Evaluation and Planning). Its aims are to develop system that is to improve productivity & quality, to create a higher value-added business, and to cultivate international competitiveness in the construction industry. The virtual construction system is a design, engineering, and construction management information system that allows the project participants to effectively share the information throughout the construction life cycle with the support of 3D and design information. To achieve this, the research team focuses on developing several systems. First, the team focuses on developing for the pre-planning, the structural engineering, MEP, and the 3D based estimation system. Second, they focus on developing a simulation system for the construction process planning and feasibility study with help of the virtual reality technologies. Third, they focus on developing the CPLM (Construction Project Life-cycle Management) system for managing construction project data, and the decision support system that makes the collaboration among the project participants based on 3D technologies and information. We also focus on developing the SDAI (Standard Data Access Interface), the localized guideline for 3D design, and a training program. In addition, we focus on developing the undeveloped area of the commercial system and building an environment that can support the communication and collaboration in the construction life-cycle rather than developing the existing and commercialized system.

• Journal of Korea Water Resources Association
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• v.53 no.spc1
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• pp.765-772
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• 2020

The amount of water resources identified by water balance analysis are usually used to formulate water resources plans. However, this does not consider the trade in goods between countries. It is possible to use virtual water to come up with a supply and demand plan by looking at the export and import of products. This is because it looks comprehensively at the direct water use (water resources within the region) and indirect water use (water resources of other regions from imported products). Yet South Korea does not actively use the concept of virtual water in the national water resources plan. There is difficulty with calculating and identifying the appropriate virtual water amount as many of the research papers present only few of the cases or omit the calculation process. This paper introduces detailed water footprint values for calculating the virtual water trade for South Korea. The international movement, water footprint, and virtual water trade of agricultural and livestock products are presented and compared to existing research. The water footprint and virtual water research in this paper can be utilized as baseline data for future researchers.

• Journal of the Korea Convergence Society
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• v.11 no.9
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• pp.15-20
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• 2020

Software-related training can be considered essential in situations where software is an important factor in national innovation, growth and value creation. As one of the implementation methods for engineering education, various education through virtual simulations that can educate difficult situations in a similar environment are being conducted. Recently, the construction of smart factories at production and manufacturing sites is spreading, and product inspections using vision systems are being conducted. However, it has many difficulties due to lack of operation technology of vision system, but it requires a lot of cost to construct the system for education of vision system. In this paper, provide an educational virtual simulation model that integrates computer and physics engine camera functions and can extract and transmit video. It is possible to generate an image of 30Hz or more at an average of 35.4FPS of the experimental results of the proposed model, and it is possible to send and receive images in a time of 22.7ms, which can be utilized in an educational virtual simulation educational environment.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.236.2-236.2
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• 2014

세계 반도체 시장은 컴퓨터 기능이 더해진 모바일 기기의 수요가 증가함에 따라 메모리반도체의 시장규모가 최근 빠른 속도로 증가했다. 특히 모바일 기기에서 저장장치 역할을 하는 비휘발성 반도체인 NAND Flash Memory는 스마트폰 및 태블릿PC 등 휴대용 기기의 수요 증가, SSD (Solid State Drive)를 탑재한 PC의 수요 확대, 서버용 SSD시장의 활성화 등으로 연평균 18.9%의 성장을 보이고 있다. 이러한 경제적인 배경 속에서 NAND Flash 미세공정 기술의 마지막 단계로 여겨지는 1Xnm 공정이 개발되었다. 그러나 1Xnm Flash Memory의 생산은 새로운 제조설비 구축과 차세대 공정 기술의 적용으로 제조비용이 상승하는 단점이 있다. 이에 따라 제조공정기술을 미세화하지 않고 기존의 수평적 셀구조에서 수직적 셀구조로 설계 구조를 다양화하는 기술이 대두되고 있는데 이 중 Flash Memory의 대용량화와 수명 향상을 동시에 추구할 수 있는 3D NAND 기술이 주목을 받게 되면서 공정기술의 변화도 함께 대두되고 있다. 3D NAND 기술은 기존라인에서 전환하는데 드는 비용이 크지 않으며, 노광장비의 중요도가 축소되는 반면, 증착(Chemical Vapor Deposition) 및 식각공정(Etching)의 기술적 난이도와 스텝수가 증가한다. 이 중 V-NAND 3D 기술에서 사용하는 박막증착 공정의 경우 산화막과 질화막을 번갈아 증착하여 30layer 이상을 하나의 챔버 내에서 연속으로 증착한다. 다층막 증착 공정이 비정상적으로 진행되었을 경우, V-NAND Flash Memory를 제조하기 위한 후속공정에 영향을 미쳐 웨이퍼를 폐기해야 하는 손실을 초래할 수 있다. 본 연구에서는 V-NAND 다층막 증착공정 중에 다층막의 두께를 가상 계측하는 알고리즘을 개발하고자 하였다. 증착공정이 진행될수록 박막의 두께는 증가하여 커패시터 관점에서 변화가 생겨 RF 신호의 진폭과 위상의 변화가 생긴다는 점을 착안하여 증착 공정 중 PECVD 장비 RF matcher와 heater에서 RF 신호의 진폭과 위상을 실시간으로 측정하여 데이터를 수집하고, 박막의 두께와의 상관성을 분석하였다. 이 연구 결과를 토대로 V-NAND Flash memory 제조 품질향상 및 웨이퍼 손실 최소화를 실현하여 제조 시스템을 효율적으로 운영할 수 있는 효과를 기대할 수 있다.

• Journal of the Society of Naval Architects of Korea
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• v.39 no.3
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• pp.75-80
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• 2002

In these days of severe struggle for existence, the world has changed a great deal to global and digital oriented period. The enterprises try to introduce new management and production system to adapt such a change. But, if the only new technologies are applied to an enterprise without definite analysis about manufacturing, failure fellows as a logical consequence. Hence, enterprise must analyze manufacturing system definitely and needs new methodologies to mitigate risk. This study suggests that the new approach, which is systems approach for process improvement, is organized to systems analysis, systems diagnosis, and systems verification. Systems analysis analyzes manufacturing systems with object-oriented methodology-UML(Unified Modeling language) from a point of product, process, and resource view. Systems diagnosis identifies the constraints to optimize the system through scientific management or TOC(Theory of constraints). Systems verification shows the solution with virtual manufacturing technique applied to the core problem which emerged from systems diagnosis. This research shows the artifacts to improve the productivity with the above methodology applied to forming shop. UML provides the definite tool for analysis and re-usability to adapt itself to environment easily. The logical tree of TOC represents logical tool to optimize the forming shop. Discrete event simulator-QUEST suggests the tool for making a decision to verify the optimized forming shop.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.340-347
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• 2016

Since the 1970s, manufacturing has been one of the key driving forces that has led to Korea's economic growth. However, this growth rate has been reduced significantly since the 2000s, and shows that revenues and employment are steadily decreasing. In addition, while manufacturing investment in Korea has dropped sharply, the United States, Germany, Japan, and other major countries have increased investment in manufacturing. These countries have promoted manufacturing innovation strategies that include the convergence of information and communications technologies (ICT) and manufacturing. For manufacturing innovation, it is important for time and cost savings required for product development to be achieved by changes in the production process, especially product design. Modeling and simulation (M&S) is a process that replaces physical product design, mockup making, and testing, with virtual product creation (modeling) and engineering analysis (simulation). In this paper, we analyze the economic ripple effect of supercomputing M&S using an input-output model technique based on the input-output tables published by the Bank of Korea. When we set the M&S budget (about US$16 million for the last 10 years) of the Korea Institute of Science and Technology Information (KISTI) as input coefficients, the effect on production inducement, value-added inducement, and employment inducement was analyzed to be US$24 million, US$13.4 million, and 267, respectively.

• Journal of the Korea Convergence Society
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• v.12 no.1
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• pp.185-191
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• 2021

A powder metallurgy process with granules is the manufacturing technology that can achieve higher-density sintered parts than conventional powder metallurgy processes. However, there is a disadvantage in that the production cost increases significantly due to the additional granulation step. High granule productivity must be guaranteed for affordable material costs in this manufacturing technology. This paper performed a series of scattering, collision, and adhesion simulations of agglomerated powders to investigate the characteristics of granulation process affecting the manufacturing yield rate. The results of this simulation-based convergence study can contribute to improving productivity in the metal powder spray granulation process.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.753-760
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• 2006

초고속 인터넷망의 보급으로 멀티미디어 환경에서의 디지털 콘텐츠 생산 및 유통은 시간적, 공간적 제약을 뛰어 넘어 다방면으로 활성화되고 있다. 네트워크 구조에서의 파일전송기술에 의해 디지털 콘텐츠는 인터넷 공간에서 역학적인 사회적 관계을 맺은 사용자에 의해 공유되고 있으며, 공급과 수요의 증가로 불법 콘텐츠 시장이 육성되어 저작권에 대한 법적인 이슈가 날로 첨예화 되고 있다. 본 연구는 네트워크 환경에서 사회적 연결망을 기반으로 한 사용자의 콘텐츠 공유 행위에 대한 심리적 요인를 분석함으로써, 사용자간의 관계 조명 및 상호작용과 콘텐츠 공유의 동기부여요인 대해 논의해 보고자 한다. 이를 위한 첫번째로 현재 인터넷 시장의 디지털 콘텐츠 공유현황 분석이 선행되었고, 두번째로 가상공간에서의 커뮤니케이션은 사회적 관계형성이란 관점에서 사용자간의 공유 행위를 정리하였으며, 마지막으로 공유 행위자의 심리적 욕구를 아브라함 매슬로우(Abraham H. Maslow) 욕구단계설을 근간으로 하여 재조명하였다. 이는 네트워크 구조에서의 콘텐츠 생산에 활성화를 위하여 다각적인 측면으로 접근하였으며, 향후 정법화된 디지털 콘텐츠 시장 조성을 위한 가이드로 제시하고자 한다.

• IE interfaces
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• v.14 no.2
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• pp.120-126
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• 2001

Virtual manufacturing is a technology facilitating effective development and agile manufacturing of products via sophisticated computer models representing physical and logical schema and behavior of real manufacturing systems including manufacturing resources, environments, and products. Based on these models, virtual manufacturing supports decision making and error checking in the entire manufacturing processes from design to mass production. At first, we analyzed manufacturing preparation activities of the four major production shops such as press, body assembly, painting and final assembly, of a Korean automotive company. We then developed the workflow models out of the analysis by the IDEF methodology, and generated a strategic plan for the systematic application of the virtual manufacturing technologies. We identified many manufacturing preparation activities that can be improved by the application of virtual manufacturing technologies. Finally, we estimated the effect of improvement including time savings in car development processes and corresponding cost savings.

• Journal of Information Management
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• v.39 no.4
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• pp.155-171
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• 2008

We constructed the integrated management system of distributed astronomical data of Bohyunsan Optical Astronomy Observatory(BOAO), Sobaeksan Optical Astronomy Observatory (SOAO), and Mt. Lemmon Optical Astronomy Observatory(LOAO). The observed data was stored in the archive of the observatory and MySQL table is saved in the integrated management system. There are data archive managers in the observatories and they manage the integrated management system such as data storing, head information extraction, table generation, and management of web pages, etc. The users can search and download all the data in the integrated management system web page. The concept of this system - send queries from web page to the observatory archives - is the same of the basic concept of virtual observatory. This research is one of the main work in the Korean virtual observatory which is take part in the international virtual observatory alliance.