• Journal of Technology Innovation
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• v.12 no.3
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• pp.135-157
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• 2004

As the speed of technological changes increase with the investment requirements steadily expanding, private firms and government-funded research institutes experience similar pressures with respect to the necessity of risk reduction and technological alliances in R&D activities. This paper first attempts to review previous research in managing R&D projects with large, risky, and long-term investment requirements. Our primary focus is placed on the "fuzzy front-end" (FFE) projects with uncertainties at the investigation and planning stages. We analyze various elements that create FFE conditions, classify them into basic constructs, and suggest tools and methods to deal with FFE conditions. The findings suggest that both initial FFE conditions and the effectiveness of FFE management affect the performance of the project later on, and thus, especially for large projects, we must deal with FFE seriously in a comprehensive manner. We utilize in-depth panel interviews and case studies to approach the research questions.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.779-782
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• 2003

컴퓨터 관련기술의 눈부신 발전은 기술적인 분야뿐만 아니라 우리의 생활과 문화의 거의 모든 분야의 변화를 초래했다 그 중 하이퍼미디어 분야는 편이성과 오락성을 바탕으로 대중들에게 크게 어필하면서 전문가가 아닌 사용자에게도 컴퓨터에 대한 접근을 더욱 쉽게 유도하였다 이러한 하이퍼미디어의 가능성은 교육분야에도 광범위하게 적용되어 텍스트나 단순한 이미지만으로 학습하기 어려운 부분을 동영상과 사운드, 상호작용을 이용하여 보다 쉽고 편리하며 재미있게 학습할 수 있게 되었다. 본 연구에서 구현된 컴파일러 프론트 엔드 학습모듈은 이러한 하이퍼미디어의 장점을 최대한 살려 컴퓨터 관련학과 학생들에게도 난이도가 높은 '컴파일러'라는 과목을 보다 시각적이고 역동적인 화면과 사운드를 이용하여 학습효과를 극대화하는데 활용할 수 있을 것이다.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.947-954
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• 2008

Nowadays many urban subways are frequently constructed under the building and the river by the use of tunneling method. Especially, the majority of the tunnel are constructed even with shallow depth under the ground in the weathered soil. Since the tunnel are generally designed on the basis of the geographic soil investigation, the stability of the tunnel should be checked with the realistic data instrumented during construction. The displacement of the tunnel occurs in front of the end face during the excavation of the tunnel, which is called as pre-displacement. The total displacement can be figured from the exact pre-displacement, which is very difficult to measure without using any device installed in front of the tunnel end face. In this study, the pre-displacement measured from horizontal inclinometer was analyzed to know the co-relation with the total displacement and also, the trend and the characteristics of the tunnel deformation during construction was suggested through the regression analysis of the measured data.

• Journal of information and communication convergence engineering
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• v.17 no.3
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• pp.221-226
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• 2019

In this work, a transmitter/receiver front-end module (T/R FEM) with an automatic Tx/Rx switching scheme for a 2.4 GHz microwave power transfer is developed for a retro-reflective beamforming scheme. Recently, research on wireless power transfer techniques has moved to wireless charging systems for mobile devices. Retro-reflective beamforming is a good candidate for tracking the spatial position of a mobile device to be charged. In Tx mode, the T/R FEM generates a minimum of 1 W. It also comprises an amplitude and phase monitoring port for transmitting RF power. In Rx mode, it passes an Rx pilot signal from a mobile device to a digital baseband subsystem to recognize the position of the mobile device. The insertion loss of the Rx signal path is 4.5 dB. The Tx and Rx modes are automatically switched by detecting the Tx input power. This T/R FEM is a design example of T/R FEMs for wireless charging systems based on a retro-reflective beamforming scheme.

• Journal of information and communication convergence engineering
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• v.18 no.4
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• pp.254-259
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• 2020

Phased-array antennas comprise a demanding antenna design methodology for commercial wireless communication systems or military radar systems. In addition to these two important applications, the phased-array antennas can be used in beamforming for wireless charging. In this study, a four-way analog beamforming front-end module (FEM) for a hybrid beamforming system is developed for 2.4 GHz operation. In a hybrid beamforming scheme, an analog beamforming FEM in which the phase and amplitude of RF signal can be adjusted between the RF chain and phased-array antenna is required. With the beamforming and beam steering capability of the phased-array antennas, wireless RF power can be transmitted with high directivity to a designated receiver for wireless charging. The four-way analog beamforming FEM has a 32 dB gain dynamic range and a phase shifting range greater than 360°. The maximum output RF power of the four-way analog beamforming FEM is 40 dBm (=10 W) when combined the four individual RF paths are combined.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.125-126
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• 2009

본 논문에서는 클라우드 컴퓨팅 기반의 가상머신 임대 서비스 구현을 위해 OpenNebula 기반의 클라우드 클러스터를 구축하였다. 클라우드 클러스터는 1대의 Front-End와 4대의 클러스터 노드로 구성하고 클러스터 노드에는 Xen을 통하여 서버 가상화를 실현한다. 사용자는 개인 맞춤형 가상머신 요구사항 템플릿을 작성한 뒤 Front-End를 통하여 클라우드 클러스터에 가상 머신 임대 서비스를 요청한다. 본 실험에서 총18개의 가상머신을 임대하는 서비스를 실행하여 생성된 가상 머신의 동작 및 네트워크 서비스를 구현하였다.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.415-419
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• 2015

Engineering is a value-adding process applying knowledge and skills in the construction industry that includes the planning, feasibility study, project management (PM), front end engineering and design (FEED), detail design, procurement, construction, supervision, and operation. Among these engineering activities, FEED is defined as a comprehensive design practice in the early design phase focused on conceptual design and basic design. It is a particularly influencing area that determines the competitiveness of procurement and construction capability of construction firms (KNIN 2013). Nevertheless, previous studies in FEED have been limited to the design process, deliverable, or particular management technique (e.g. system engineering, collaboration, information etc.). In this context, the purpose of this study is to propose a comprehensive FEED business process structure for project management of thermal power plant construction projects encompassing the entire project life cycle. And an assessment methodology for FEED functions was developed. It is expected that the proposed structure of FEED functions and FEED evaluation methodology will contribute to improvement of competitive capability of engineering, procurement, and construction (EPC) companies.

• Journal of KIBIM
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• v.14 no.1
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• pp.11-21
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• 2024

This study is about a case of web application development using representative commercial BIM platform-linked APIs from Autodesk and Bentley Systems. The development method was aimed at application development using Autodesk's Forge API and Bentley System's iTwin API. The specific development content was limited to the Model Viewer, Issues, and File Transfer API, and the administrator's site. The first research result is that parts with different internal configurations of commercial platforms were independently modularized and developed, and the common front-end was unified. The second research result is that a web front-end technology, was used to visualize 3D models using the viewer API, and the possibility of additional application expansion was discovered.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.67-68
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• 2001

무부자 쌍끌이 중층망은 유속에 관계없이 뜸줄이 거의 일직선으로 유지되고 뜸줄의 깊이 변화가 없으므로 부력은 작용하지 않지만 아래 끌줄의 길이를 조절함으로써 망고를 유지할 수 있다. 또한, 무부자 쌍끌이 중층망은 발줄의 침자 외에도 추(Front weight)와 날개끝 추(Wing-end weght)의 무게를 증가시키면, 아래쪽으로의 침강력이 작용하여 망고를 더 크게 할 수 있어 기존어구보다 전개성능을 더욱 향상시킬 수 있다. (중략)

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.251-251
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• 2006