• 기계와재료
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• v.23 no.4
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• pp.6-15
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• 2011

자연은 인간이 만들어낸 기술적 해결책들보다 현저히 적은 양의 에너지를 소비하며, 적은 물질로 다양한 구조를 창출해 내는 고효율 최적화 시스템이며, 스스로 정화작용과 선순환을 유지하는 환경 친화적 시스템이다. 이러한 자연에서 영감을 얻어 활용하고 응용하는 기술은 최근 나노-바이오기술의 급속한 발전과 더불어 새롭게 각광받는 융합기술 분야로 부각되고 있다. 나노스케일의 생체물질을 관찰하고 특성을 평가할 수 있는 고성능의 장비가 개발되고, 생체 물질을 분자 단위로 조합하고 합성하는 등의 첨단기술이 발전됨에 따라 자연모사기술도 새로운 전기를 마련하고 있다. 자연 생명체/생태계가 지닌 혁신적인 해결 가능성(Innovation Potentials)을 구현하기 위해서는 자연모사기술 분야에 좀 더 체계적이고 지속적인 관심과 지원을 기울여야 할 것이며, 이를 바탕으로 인류가 당면한 에너지 자원 기후변화 환경 문제 등의 글로벌 이슈를 극복하고 선순환의 개념의 자연모사 에코 기술과 지속가능한 혁신 기술 달성이 가능할 것으로 기대된다.

• Journal of Korea Society of Industrial Information Systems
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• v.19 no.1
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• pp.99-109
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• 2014

This study illustrates and compares the platform strategy of Apple and Samsung, which have been operating their own App stores, by using the $IISI^n$ model. Apple, the first mover of the platform, has employed closed strategy for quality control of the platform and customer loyalty. On the other hand, Samsung has employed open strategy for increasing the platform network effects. The result of this study showed that the platform strategy "Openness", which is a free entry of participants, and "Sharing" of created value, are important along with the excellent platform environment. As a pioneering study of the platform strategy for the co-creation, this research contributes to both theory and practice.

• The Optical Journal
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• s.136
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• pp.42-44
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• 2011

부품소재산업의 발전은 산업 간 연관관계를 강화함으로써 수출과 내수 간 선순환 구조를 정착시키고, 중소기업의 발전을 통해 대기업-중소기업 간 동반성장과 일자리 창출, 내수기반의 확대에도 기여할 수 있다. 개방경제에서 일국의 국제분업 위상과 이득은 국가 간 상대적인 관계속에서 형성된다는 점에서, 개방 경제의 시각에서 본 정부의 역할은 폐쇄경제의 시각에서보다 더 크고 중요하다. 또한 경기침체기에는 부품소재에 대한 민간의 R&D투자 역량이 약화되는 경향이 있으므로 R&D투자를 위한 정부의 역할이 더욱 중요하다. 이 모두가 '부품소재특별조치법'이 연장돼야 할 이유다.

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2021.10a
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• pp.88-89
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• 2021

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.2
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• pp.245-254
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• 2015

The purpose of this research is to study the cyclic structure of startup ecosystem and draw the necessary conditions for maintaining it to successfully induce the activation entrepreneurship. Therefore, we design start-up cycle structure based on the enterprise ecosystem to verify this, we discussed the Tech City in the United Kingdom and Silicon Valley in USA. Required factors for running the start-up cycle structure is summarized as follows. First, the shared platform is provided to form between components in accordance with the object, second, this can be made based on the excellent human resources, third, a number of consumer groups such as venture capitals and angels that revenue from the virtuous circle should be formed, fourth, get the other regional networks and associated, fifth to make it easy to start-ups through government and institutional support and finally, a stand-alone producers(startups) should be fostering entrepreneurship.

• Computational Structural Engineering
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• v.9 no.3
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• pp.145-155
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• 1996

This paper suggests a new algorithm of automatic mesh generation over planar domains with arbitrarily shaped boundaries and control curves. The algorithm is based on the method of recursively subdividing the domain by the path connecting, with minimum penalty value, two points on the super-loop, which consists of the boundaries and the control curves, The algorithm is not subject to any limitation on the shape of the domain, and its process can be fully automated. Therefore, this algorithm can be implemented into computer programs which require minimal user intervention while generating finite element meshes over complicated domains. This algorithm can also be easily extended for application to the generation of meshes over curved surfaces, or to the adaptive mesh generation.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.549-552
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• 2006

국내 유무선 인터넷은 세계 시장과 통신트랜드를 주도할 정도로 이용자 규모, 서비스 다양성, 서비스 수용성 측면에서 커다란 성과를 나타내며 이는 선순환 구조를 통해 단말기, 장비, 콘텐츠 산업의 경쟁력을 강화시키는데 기여하고 있다. 또한 국내 통신시장은 와이브로와 HSDPA로 대표되는 광대역 무선인터넷 시대를 선도할 것으로 기대되고 있다. 본 글에서는 전국 일반인을 대상으로 시장조사 결과를 바탕으로 유무선 인터넷의 이용행태를 파악하고 광대역 무선인터넷에 대한 니즈를 탐색하고자 하였다. 분석결과, 국내 유무선 인터넷 시장은 10~20대의 학생층뿐만 아니라 30대 이상의 화이트 칼라로 이용층으로 확대되며 이 계층이 광대역 무선인터넷의 핵심 이용자군으로 잠재력을 지닌 것으로 나타났다.

• Journal of Cadastre & Land InformatiX
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• v.49 no.2
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• pp.39-56
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• 2019

In this study, we analyzed the effect of the Eungam Loop Line of Seoul Subway Line 6 on the sale price of adjacent row and multi-family houses on the accessibility and structural characteristics of subway stations. This study empirically analyzed a total of 17,938 cases from 2006 to 2017 based on data on the sale price of row and multi-family houses. In summary, the results of this study using the Hedonic Price Model are as follows. First, this study confirms that the Eungam Loop Line characteristics have a positive effect on the sale price as it is adjacent to the subway station. It is noteworthy that the sale price of 100-200m segment has a positive effect, and the sale price of Bulgwang station, which has excellent mobility and connectivity with CBD, YBD and GBD, has a positive effect. Second, this study shows the locational characteristics such as distance to bus stop, distance to mart, and distance to school have influence on the sale price. Third, this study finds the land characteristics such as land area, land shape, land facing, and road width, have significant effects on the sale price. Fourth, this study discovers the sale price is also is also affected by building and floor characteristics such as the type of housing, building area, the number of households, building age, elevator, and floor level.

• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.2
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• pp.146-151
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• 2015

Recycled aggregate by the recycling construction waste has a lot of advantage such as the developing the alternative resource and protecting of environment. However, recycled aggregate is used as the low quality grade, because it is difficult to remove old mortar from aggregate. To use the recycled aggregate as high quality grade, it is important to develop the technology to produce the high quality recycled aggregate. To manufacture the high quality recycled aggregate, old mortar attached on the aggregates should be removed efficiently. Therefore, in this study, we suggested the optimum condition to remove old mortar effectively using sulfuric acid and low speed wet rotary mill for high quality recycled fine aggregate. The results shows that the recycled aggregate satisfy on the standards of KS F 2573 in density, absorption and solid volume, when adequate condition of sulfuric mole ratio and aggregate ratio are make.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.4
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• pp.691-698
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• 2003

We extend the sue of the method of least square to develop a recursive algorithm for the design of adaptive transversal filters such that, given the least-square estimate of this vector of the filter at iteration n-l, we may compute the updated estimate of this vector at iteration n upon the arrival of new data. We begin the development of the RLS algorithm by reviewing some basic relations that pertain to the method of least squares. Then, by exploiting a relation in matrix algebra known as the matrix inversion lemma, we develop the RLS algorithm. An important feature of the RLS algorithm is that it utilizes information contained in the input data, extending back to the instant of time when the algorithm is initiated. In this paper, we propose new tap weight updated RLS algorithm in adaptive transversal filter with data-recycling buffer structure. We prove that convergence speed of learning curve of RLS algorithm with data-recycling buffer is faster than it of exiting RLS algorithm to mean square error versus iteration number. Also the resulting rate of convergence is typically an order of magnitude faster than the simple LMS algorithm. We show that the number of desired sample is portion to increase to converge the specified value from the three dimension simulation result of mean square error according to the degree of channel amplitude distortion and data-recycle buffer number. This improvement of convergence character in performance, is achieved at the B times of convergence speed of mean square error increase in data recycle buffer number with new proposed RLS algorithm.