• 한국수소및신에너지학회논문집
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• 제26권3호
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• pp.241-246
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• 2015

The interest of New Renewable Energy is increasing globally because of the increment of the uncertainty for the energy's supply and demand, and the increment of the frequency in weather anomaly and its damages. One of the New Renewable Energies, Hydrogen receives attention as the future energy that can deal with global environment regulation. Fuel Cell Electric Vehicle (FCEV) is an environment-friendly vehicle that uses Hydrogen as fuel. The electric power for FCEV is generated by chemical reaction with Oxygen from the air and Hydrogen. Hyundai Motor Company (HMC) has developed a proprietary fuel cell system since 2005. In 2012, HMC is the first car maker that mass-produces the ix35 FCEV to the worldwide such as North America, Europe, etc. In order to develop and improve the FCEV technology, data acquisition and analysis of the driving vehicle information is essential. Therefore, the monitoring system is developed, which is consist of datalogger, Automatic Vehicle Location (AVL) server and main server. Especially, WCDMA technology is integrated into the system which enables the data analysis without any restriction of time and region. The main function of the system is the analysis of the driving pattern and the component durability, and the safety monitoring. As a result, ix35 FCEV has successfully developed by using the developed monitoring system. The system is going to take an advantage of development in the future FCEV technology.

• Nuclear Engineering and Technology
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• 제52권9호
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• pp.2119-2129
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• 2020

Flow-accelerated corrosion (FAC), liquid droplet impingement erosion (LDIE), cavitation and flashing can cause continuous wall-thinning in nuclear secondary pipes. In order to prevent pipe rupture events resulting from the wall-thinning, most NPPs (nuclear power plants) implement their management programs, which include periodic thickness inspection using UT (ultrasonic test). Meanwhile, it is well known in field experiences that the thickness measurement errors (or deviations) are often comparable with the amount of thickness reduction. Because of these errors, it is difficult to estimate wall-thinning exactly whether the significant thinning has occurred in the inspected components or not. In the previous study, the authors presented an approximate estimation procedure as the first step for thickness measurement deviations at each inspected component and the statistical & quantitative characteristics of the measurement deviations using plant experience data. In this study, statistical significance was quantified for the current methods used for wall-thinning determination. Also, the authors proposed new estimation procedures for determining local wall-thinning to overcome the weakness of the current methods, in which the proposed procedure is based on analysis of variance (ANOVA) method using subgrouping of measured thinning values at all measurement grids. The new procedures were also quantified for their statistical significance. As the results, it is confirmed that the new methods have better estimation confidence than the methods having used until now.

• 대한전기학회논문지:전력기술부문A
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• 제48권10호
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• pp.1356-1363
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• 1999

In this paper, a new method for controlling the pointing device using EOG(electrooculogram) signal generated from eye movement was suggested. The basic idea of the method is to control the direction of pointer, as using the results of measuring each component of the horizontal EOG and the vertical EOG by angle of eye-gaze. As a practical example, pointing device controlling the personal computer's pointer is manufactured. The designed pointing device consists of pre-amplifier, A/D converter, serial transmission device and PC program. That is, first, the EOG is amplified by pre-amplifier. Secondly, the amplified EOG is digitized and transmitted to personal computer by PIC16C74A. Finally, the software for controlling the pointer on personal computer is programed. As the result, the measured horizontal EOG and vertical EOG by eye-gaze angle had high linearity; the correlation coefficients of the regression line were 0.998 and 0.996 respectively. And the developed pointing device is able to control the personal computer's pointer, and the average of the errors between the objective value and the observed value had 3.77% for horizontal axis and 5.85% for vertical axis. The pointing device developed in this study is able to control personal computer's pointer by subject's eye movement, that is, the user's intention. Furthermore, the algorithm of this study is applicable for many field, such as a new method remote control, a new wheelchair control and so forth.

• 한국산림과학회지
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• 제37권1호
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• pp.57-60
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• 1978

Significant findings concerning the cause of the gardening revolution of the eighteenth century in England, its landscape style and contribution to a new style are concluded as follows: 1. The English landscape garden is regarded as a great revolution in the history of landscape architecture, and it was in the eighteenth century, in England, that garden and landscape first came together. 2. For at no time in history has there been such general interest in gardens and in the total physical landscape, so much writing and criticism and open debate. 3. Garden design did not become a definite art form in England until the eighteenth century. During the period it can be seen that there were developing three distinct types of garden, that is, the picturesque garden, the 'poetic' garden and 'abstract' garden. 4. Also developing was a new appreciation for natural forms and natural landscape, expressed in painting, poetry and garden design, and the landscape gardeners tried bard to malce country scenery look as though man had not had a hand in it. Eventually these open spaces contributed to a new type of spatial form development of naturalistic landscape style which is today taken for granted as a normal component of the landscape architect's palette.

• 한국가구학회지
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• 제22권4호
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• pp.270-277
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• 2011

This study aims to find new solutions to the problem of utilization of materials and techniques represented in the development of modern lighting design. LED is an important component in modern lighting design and pine tree is one of the most popular domestic wood in furniture design in Korea. In this study, design is developed into various types of furniture such as a table, a chest, and a lighting, by researching manufacturing process and examining the use of slicing pine tree. The technique of slicing pine tree is a simple linear arrangement that was traditionally used in wooden furniture in Lee dynasty, with an emphasis on repetitive rhythm. The slicing technology is used to expand the usage of domestic pine tree. The beauty of natural wood is expressed with the transmission of light by applying this technique to the lighting design. It also brings new communication in between artificial lighting and natural wood combining this traditional technique and LED lighting in design. Finally, this study suggests particular value through the convergence of analog and digital by using the traditional wooden technique that keeps natural wood prints and new digital technology by using LED lighting. More discussions and research about this subject are expected continuously through this study.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.94-98
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• 2013

Transfer Path Analysis (TPA) is commonly used, by car makers and parts suppliers, analysis process to root the cause of NVH problems. In general, TPA is an analyzing technique to find the contributing factors of noise/vibration problems, and their transfer path in vehicle. However, not only TPA is used to analyze the source of NVH problems but also is used to predict NVH performance prior to the proto vehicle, or to set the development target for next new vehicle. Automotive parts manufacturing companies have to set NVH performance target when developing new systems just as car makers have NVH target set for new vehicle. Nevertheless, most of components are currently being developed based on subjective evaluation without an objective target. To judge the suitability of using TPA to set NVH target of electric parking brake, this research analyzed the transfer path by setting them in two points of view; Chassis Module and Electric Parking Brake, and comparing the measured value and calculated value. From this result, NVH target of electric parking brake will be approached in level of vehicle, system and component.

• Advances in concrete construction
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• 제13권 2호
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• pp.153-162
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• 2022

Prefabricated exterior wall panel is the main non-load-bearing component of assembly building, which affects the comprehensive performance of thermal insulation and durability of the building. It is of great significance to develop new prefabricated exterior wall panel with durable and lightweight characteristics for the development of energy-saving and assembly building. In the prefabricated sandwich insulation hanging wall panel, the selection of material for the outer layer and the arrangement of the connector of the inner and outer wall layers affect the mechanical performance and durability of the wall panels. In this paper, high performance cement-based composites (HPFRC) are used in the outer layer of the new type wall panel. FRP bars are used as the interface connector. Through experiments and analysis, the influence of the arrangement of connectors on the mechanical behaviors of thin-walled composite wall panel and the panel with window openings under two working conditions are investigated. The failure modes and the role of connectors of thin-walled composite wallboard are analyzed. The influence of the thickness of the wall layer and their combination on the strain growth of the control section, the initial crack resistance, the ultimate bearing capacity and the deformation of the wall panels are analyzed. The research work provides a technical reference for the engineering design of the light-weight thin-walled and durable composite sandwich wall panel.

• 한국콘텐츠학회논문지
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• 제14권7호
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• pp.518-528
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• 2014

본 연구는 서울시 강남구 U-street에 설치된 L.E.D 미디어 폴(Media pole)이라는 통합형 가로시설물이 보행 만족도에 어떠한 영향을 미치는지 분석하는 것이 주요 목적이다. 이를 위해 가로시설물로서 미디어폴의 구성요소를 보행자 관점에서 탐색적으로 살펴보고 이를 바탕으로 요인분석을 실시하였다. 요인분석을 통해 제1요인은 '심미 상징성'요인으로 명명하였고, 제2요인은 '형태 조형성', 제3요인은 '접근 연속성'으로 분석하였다. 제4요인은 '감각 전달성', 제5요인은 '정보 매체성'으로 명명하였다. 요인분석은 이용자 관점에서 사례대상지 보행자에 대한 행태관찰과 심층면접(In-depth Interview)을 실시하였고, 33개 예비변수를 도출하였다. 도출된 예비요인을 전문가 F.G.I(Focus Group Interview)를 통해 최종적으로 요인분석에서 사용할 20개 예비변수를 선정하였다. 요인분석을 통해 선정된 5개의 독립변수와 보행자의 만족도를 종속변수로 다중회귀분석을 실시한 결과 강남대로 U-street에 설치된 미디어 폴이 보행자의 보행만족도에 미치는 영향 중 통계학적 유의미한 영향요소는 '심미 상징성'요인으로 분석되었다. U-street에서 미디어 폴은 보행자에게 심미적 감성과 상징성으로 새로운 보행체험에 기여하고 있는 것으로 판단된다. 향후 이용자 편의성을 기반으로한 정보매체로서의 접근성을 강화하고 활용 가능한 콘텐츠 다양화를 유도해야할 것이다. IT 기반형 멀티미디어 매체인 미디어폴은 융합하는 가로환경과 융합하여 보행자에게 새로운 경험을 제공하여 보행활성화에 새로운 수단으로서의 가능성을 시사하고 있다.

• 한국항해항만학회지
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• 제35권3호
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• pp.187-195
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• 2011

선박운항자의 인적사고 방지 및 운항 훈련을 위한 방안으로 선박 운항 시뮬레이터가 사용된다. 선박운항 시뮬레이터에서 실시간 3D 가시화 기술은 현실감 있는 직관적인 영상을 제공하여 피교육자에 인지력을 향상시켜 시뮬레이터의 교육 효과를 높이는 중요한 요소이다. 본 연구에서는 공개형 3D 그래픽 엔진을 기반으로 선박 운항 시뮬레이터용 실시간 3D 가시화 시스템을 설계하고 구현한 결과에 대해서 설명한다. 실시간 3D 가시화 시스템은 요소 기능, 기존 그래픽 데이터 활용, 타 시스템과의 연동 측면에서 도출된 운용 요구사항들을 만족하며 추가적인 기능의 확장이 용이한 구조로 설계되었다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
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• pp.185-192
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• 1995

A common control model used to implement computer integrated manufacturing(CIM) is based on the hierarchical decomposition of the shop floor activities, in which supervisory controllers are responsible for all the interactions among subordinates. Although the hierarchical control philosophy provides for easy understanding of complex systems, an emerging manufacturing paradigm, agile manufacturing, requires a new control structure necessary to accommodate the rapid development of a shop floor controller. This is what is called CSCW(computer supported cooperative work)-based control or component-based heterarchical control. As computing resources and communication network on the shop floor become increasingly intelligent and powerful, the new control architecture is about to come true in a modern CIM system. In this paper, CSCW-based control is adopted and investigated, in which a controller for a unit of device performs 3 main functions - planning, scheduling and execution. In this paper, attention is paid to a planning function and all the detailed planning activities for CSCW-based shop floor control are identified. Interactions with other functions are also addressed. Generally speaking, planning determines tasks to be scheduled in the future. In other words, planning analyzes process plans and transforms process plans into detailed plans adequate for shop floor control. Planning is also responsible for updating the process plan and identifying/resolving replanning activities whether they come from scheduling or execution.