• Journal of electromagnetic engineering and science
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• v.11 no.3
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• pp.220-226
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• 2011

We have proposed a new method to accurately predict the resonance of Fabry-Perot Cavity (FPC) antennas enclosed with conducting side walls. When lateral directions of an FPC antenna are not blocked with metallic walls, the conventional technique is accurate enough to predict the resonance of the FPC antenna. However, when the FPC antenna has side walls, especially for case with only a short distance between the walls, the conventional prediction method yields an inaccurate result, inevitably requiring a tedious, time-consuming tuning process to determine the correct resonant height to provide the maximum antenna gain in a target frequency band using three-dimensional full-wave computer simulations. To solve that problem, we have proposed a new resonance prediction method to provide a more accurate resonant height calculation of FPC antennas by using the well-known resonance behavior of a rectangular resonant cavity. For a more physically insightful explanation of the new prediction formula, we have reinvestigated our proposal using a wave propagation characteristic in a hollow rectangular waveguide, which clearly confirms our approach. By applying the proposed technique to an FPC antenna covered with a partially reflecting superstrate consisting of continuously tapered meander loops, we have proved that our method is very accurate and readily applicable to various types of FPC antennas with lateral walls. Experimental result confirms the validness of our approach.

• Korean Institute of Interior Design Journal
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• no.29
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• pp.77-85
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• 2001

The change of society causes the change of art necessarily. The experiments of plastic art which as been done by avant-garde movements at early 20th century have pursued ″Object drama″ consistently as trials of more or less abstract drama. As these plastic arts have used genre or media like circuses, sports, variate, films, screen play, newspapers and a quick method which had not been considered suitable for conventional aesthetic plastic arts, these arts looked provocative and, these provocative plastic arts have ignored universality shown in conventional arts and have caused extreme ″sensation″ accordingly. As a result, abstract art based on style which is against aestheticism and naturalism has been generalized. This style does not deny customary laws of art wholly but it requires new concept. Having ignored traditional styles, a new compositive and responsive way of composition which does not deviate from tradition has been pursued. A new and general understanding of arts which do not deny all conventionally-effective standards extremely has been developed. In this regard, this study analyzes characteristics of Bauhaus Theater which has tried to apply new technology engineering to plastic art as an integrated concept of art and technology amongst the directions of development of provocation, innovation and revolution in case of the plastic art of stage painting, and analyzes how this influences on modern painting in terms of avant-garde arts reviewing the meaning of this theory.

• Journal of Korean Society of Rural Planning
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• v.4 no.1
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• pp.22-31
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• 1998

For the improvement of the cultural rural village(new rural village project), it is very important to find the various planning alternatives. The purpose of this study is to suggest the ideas which are able to be applied to the rural site planning. The YoungMoon project site located in Kyunggi province was selected case study, The followings are suggestions developed in the process of preparing an alternative plan for the case study. 1) The preparing of the rural site plan is the organizing process of the planning ideas responsive to the condition of both a project site and the project directions. 2) In developing the schematic plan, it is very useful to introduce the cluster madang (small public open space) including 25 houses as a basic planning unit. 3) In comparison with the project plan, the alternative plan presented by this study has advantages of amenity and public space of the residential environment of the new rural village. It is properly said that we have to more and more discuss the best solution to take in planning the rural site, and this efforts contribute the improvement of the quality of the new village project.

• Electronics and Telecommunications Trends
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• v.36 no.3
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• pp.133-144
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• 2021

High-performance computing (HPC) is the underpinning for many of today's most exciting new research areas, to name a few, from big science to new ways of fighting the disease, to artificial intelligence (AI), to big data analytics, to quantum computing. This report captures the summary of a 9-day program of presentations, keynotes, and workshops at the SC20 conference, one of the most prominent events on sharing ideas and results in HPC technology R&D. Because of the exceptional situation caused by COVID-19, the conference was held entirely online from 11/9 to 11/19 2020, and interestingly caught more attention on using HPC to make a breakthrough in the area of vaccine and cure for COVID-19. The program brought together 103 papers from 21 countries, along with 163 presentations in 24 workshop sessions. The event has covered several key areas in HPC technology, including new memory hierarchy and interconnects for different accelerators, evaluation of parallel programming models, as well as simulation and modeling in traditional science applications. Notably, there was increasing interest in AI and Big Data analytics as well. With this summary of the recent HPC trend readers may find useful information to guide the R&D directions for challenging new technologies and applications in the area of HPC.

• Journal of Environmental Science International
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• v.31 no.7
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• pp.593-607
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• 2022

Climate change has recently become a serious global issue, and carbon emissions and energy consumption are increasing, particularly in cities where economic activities and populations are concentrated. Accordingly, various countries worldwide are promoting the Green New Deal and promoting urban-centered climate change response policies with the aim of carbon neutrality. In Korea, following the "smart green city" project that creates a city where humans and the environment coexist, a similar "carbon neutral green city" policy is set to be introduced. Therefore, in this study, implications and directions for the sustainable introduction of the carbon neutral green city policy will be derived by comparing and analyzing the State and Tribal Assistance Grants of the U.S. bipartisan infrastructure law and the smart green city of the Korean new deal.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.3019-3026
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• 2011

The pantograph on HEMU400 perform the simulation of following characteristics for pantograph's performance prediction and confirming the EN50119's requirement. To meet the performance requirements for the input data are proposed. Simulation result of the performance requirements are satisfied from proposed input data. The new model was developed by proposed data base on the simulation result. A new developed model data used in following characteristics meet to be sure about what the test was done to count the equivalence of mass. Depending on the results of test to performance prediction, and propose research directions.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.37.1-37.1
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• 2010

세계적으로 신재생에너지에 대한 관심이 높아지면서 이에 대한 국가적인 지원이 2006년에 1000억을 넘어 불과 3년 만에 그 2배인 2000억을 돌파했다. 또한 내년부터 2015년까지 민 관 합동으로 총 40조원을 신재생에너지에 투입한다고 보고되어 주위를 술렁이게 하고 있다. 우리는 신재생에너지가 더 이상 일부 국한된 기관이나 기업만의 단순 관심분야가 아닌, 세계 시장에서의 우위를 점령하기 위한 국가차원의 광대한 경쟁분야임을 다시 한번 인식해야 한다. 이러한 시점에서 국내 신재생에너지 R&D산업의 과거 발자취를 통해 미래에 나아가야 할 방향을 예측해 보는 것은 상당히 의미가 있을 것으로 생각된다. 본 고에서는 신재생에너지 분야 중 현재 가장 큰 비중을 차지하고 있는 태양광 분야에 초점을 맞추어 보았다. 그간 진행되거나 현재 진행되고 있는 R&D관련 데이터들을 수집하여 다양한 방면으로 검토해본 결과 눈에 띄는 경향을 일부 확인할 수 있었는데, 이를 통해 향후 태양광 R&D산업이 나아가야 할 방향을 예측해 보고자한다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.171-171
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• 2010

An innovative design of a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), named HSTWEC, is presented in this paper. The system is designed to convert ocean wave fluctuation into electricity by using the HST circuit and an electric generator. Based on the floating-buoy concept, the wave forces the sub-buoy to move up and down. Consequently, the electric power can be obtained from the generator in both the moving directions of the sub-buoy through the HST circuit as shown in Fig. 1. In order to investigate the HSTWEC operations, a mathematical model of the system is indispensible. In addition, the method to control the HSTWEC, including: pump displacement control, tension adjustment control and ballast weight control, is also discussed in this paper. Finally, the design concept as well as simulation results indicated that this HSTWEC design is an effective solution and possible to fabricate for wave energy generation.

• Korean Journal of Computational Design and Engineering
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• v.16 no.1
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• pp.31-40
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• 2011

Product-service system (PSS) is a system of products and service, supporting networks and infrastructure that is designed to be competitive. PSSs satisfy customers' needs more effectively and have a lower environmental impact than traditional business models. Therefore, many companies and governmental institutes are eager to implement the PSSs as a new business model. In this paper, we focus on industrial practices as new business models for the company. PSS, especially, is popular in electronic industry, so one can often observe such examples as iPod, iPhone, e-Book and etc in the field. We first thoroughly investigate the current practices of PSS in Korean electronic industry. The examples are surveyed and projected directions are given. Then, non-electronic PSSs are surveyed. Especially mechanical PSSs are intensively discussed. Based on the survey results, we propose several major development strategies of Sustainable PSS (SPSS). SPSS will bring a competitive edge for company as realization of sustainable development of PSS considering economy, society, and environment.

• International Journal of High-Rise Buildings
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• v.9 no.2
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• pp.113-125
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• 2020

Beginning in the late 19th century, construction of skyscrapers spread throughout Chicago, New York City, and then the world as demand of space in buildings and increase of cost of land. With this change curtain wall systems have evolved to be more visually complex; these unique profiles of the skyscraper became powerful images and symbols of our cities. A curtain wall is defined as usually aluminum-framed wall containing in-fills of glass and metal panels. The framing is attached to the building structure and does not carry the floor or roof loads of the building.