• Journal of Communications and Networks
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• 제13권1호
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• pp.26-31
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• 2011

In this paper, we formulate the minimum power multicast problem in wireless networks as a mixed integer linear programming problem and then propose a Lagrangean relaxation based algorithm to solve this problem. By leveraging on the information from the Lagrangean multiplier, we could construct more power efficient routing paths. Numerical results demonstrate that the proposed approach outperforms the existing approaches for broadcast, multicast, and unicast communications.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제22권1호
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• pp.75-90
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• 2015

In this paper the existence of global solutions of the parabolic cross-diffusion systems with cooperative reactions is obtained under certain conditions. The uniform boundedness of $W_{1,2}$ norms of the local maximal solution is obtained by using interpolation inequalities and comparison results on differential inequalities.

• Journal of Radiation Protection and Research
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• 제28권4호
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• pp.353-360
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• 2003

The concentration of $^{137}Cs$, the particle size, and the contents of TOC, H, N and S were measured for sediments collected in the adjacent sea to Yangnam, Korea. The concentrations of $^{137}Cs$ in sediments are in the range of $^{137}Cs$ for sediments strongly depend on particle size and TOC content of sediments. The results of multiple regression analysis suggest that humic substances may have great influence on the deposition of $^{137}Cs$ in sediment.

• 복식문화연구
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• 제30권6호
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• pp.898-918
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• 2022

Contemporary fashion research has paid increasing attention to the sublimity in the context of postmodernism. Sublimity is considered essential in contemporary fashion design as it arouses complex emotions which verbal expression cannot describe. Therefore, contemporary fashion designs need to be interpreted in terms of the sublimity. Through a detailed review of literature, the present study discusses Kantian and Lyotardian sublimity as main theories representing conventional and cotemporary concepts of sublimity. This paper selected five Korean fashion designers who won the prize of Samsung Design Fund from 2006 to 2019 and actively introduce their works every year. Images were collected to analyze their designs introduced from 2018 S/S to 2019F/W at their website. In addition, formative and color characteristics were analyzed to identify the changing features of s sublimity. Major findings of analyses are as follows. First, all designers' collections reflected both male and female sublimity with the respect to its formative characteristics. Color characteristics of sublimity indicated that Jeong, Wook Jun's collections represented features of male sublimity and other designers works showed elements of female sublimity. Essentially, the typical contemporary concept of the sublimity was found in the designs of Seo, Hye In. Consequently, female sublimity is more inclusive than male sublimity, while being opened to otherness.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1688-1690
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• 2004

초고압절연케이블의 온도변화에 따른 절연특성을 연구하였다. 온도변화는 상온, 50, 80[$^{\circ}C$]로 변화시켰으며, 전압은 0.5[kV]씩 스텝인가법에 의해 승압시켰다. 또한 보이드 특성을 위해 내부에 보이드를 삽입하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기물성,응용부문
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• pp.134-136
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• 2003

In this work, we have seen the effect of hole-transporting layer in organic light-emitting diodes using N,N'-biphenyl-N,N'-bis-(3-methylphenyl)-[1,1'-biphenyl]-4,4'-diamine(TPD) and N,N'-biphenyl-N,N'-bis-(1-naphenyl)-[l,l'-biphenyl]-4,4'-diamine(NPB). NPB is regarded as a better hole trans porting material than TPD, since it has a higher glass transition temperature($T_g$). And current-voltage, luminance-voltage and external quantum efficiency of device were measured with the thickness variation of buffer layer using copper phathalocyanine(CuPc) am polytetrafluoroethylene (PTEE) at room temperature. We have obtained an improvement of External quantum efficiency when the CuPc 30[nm] and PTFE 1.0[nm] is used.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제24권4호
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• pp.201-209
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• 2017

We prove convergence properties of the global solutions to the cooperative cross-diffusion system with the intra-specific cooperative pressures dominated by the inter-specific competition pressures and the inter-specific cooperative pressures dominated by intra-specific competition pressures. Under these conditions the $W^1_2-bound$ and the time global existence of the solution for the cooperative cross-diffusion system have been obtained in [10]. In the present paper the convergence of the global solution is established for the cooperative cross-diffusion system with large diffusion coefficients.

• 셀메드
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• 제12권3호
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• pp.13.1-13.3
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• 2022

The aim of this study was to evaluate the synergistic effect of Samulnori and Ajaeng combination in music therapy. Samulnori is the Korea's most successful traditional music. The Ajaeng, Korean traditional string instrument, generally plays the bass part in ensemble music. However, we have tried a new kind of musical style. (As you can see in the Youtube, https://youtu.be/QHIciJTTY0w). Samulnori and Ajaeng combination of our style have not been tried by any other musicians in Korea. Results from this study showed that Samulnori-induced excitation and Ajaeng-induced dynamics probably contributed to the synergistic effect of Samulnori and Ajaeng.

• 기술혁신학회지
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• 제13권3호
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• pp.423-445
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• 2010

본 논문은 연구개발과 이공계 고등교육의 상호 연계를 통한 시너지 극대화를 위한 사이버 인프라스트럭처에 기반한 차세대 연구 교육 융합환경의 구축방안을 제시하고자 수행되었다. 국가 R&D 사업을 통하여 생성 및 축적된 연구결과를 이공계 대학 및 대학원의 교육 현장에 직접 연계시킬 수 있는 방안을 마련하고자 하였다. 먼저 사이버인프라 기반의 연구개발 패러다임의 변화를 검토하였다. 이어서 연구성과를 교육에 활용하여 연구과 교육의 융합을 도모한 모형과 사례들을 분석하였다. 이러한 선행연구를 바탕으로 해서 우리나라 실정에 적합한 연구 교육 융합환경 시스템을 제안하였고, e-AIRS의 사례를 들어서 구체적으로 설명하였다. 마지막으로 이러한 사업을 추진하기 위한 정책적 과제들을 논의하였다.

• 전기학회논문지
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• 제67권8호
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• pp.1024-1030
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• 2018

Recently, the large scaled energy storage system(ESS) which has various functions such as peak saving, demand management, output stabilization of renewable energy and frequency regulation(FR) is being energetically installed and operated. Especially, as the use case of frequency regulation ESS, the KEPCO has demonstrated the total of 376[MW] ESS since 2014. However, there are no operational experiences and international technical standards on frequency regulation application in ESS. Therefore, this paper propose the evaluation algorithm for power system performance of ESS by considering the frequency characteristics between governor of existing generator and frequency regulation ESS, in order to verify the power system performance of ESS. And also, this paper propose an evaluation modeling for small scaled power system including the existing generator, frequency control ESS and customer loads based on the PSCAD/EMTDC S/W. From the simulation results in 360[MW] model power system, it is confirmed that frequency regulation ESS has better performances than conventional generators.