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이기준,윤세중,이현구 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.1
구형 무연탄 입자에 대하여 수축핵모델을 적용하여 비등온 연소현상을 연구하였다. 설정된 모델의 해가 존재하는 가능성영역(feasibility region)을 추적하여 연소현상의 예측에 이용하였으며 이 영역의 경계곡선은 단일회분층모델과 이중회분층모델로 표현되는 3종류의 한계상황을 해석하여 결정될 수 있음을 보였다. 이로부터 여러가지 입자표면온도에 대응하는 미반응탄 표면온도의 상한과 하한을 추정하였으며, 또한 입자표면에서의 반응물 및 생성물의 속(束)들과 에너지속(束)의 상한과 하한을 식으로 표현하고 반응의 진행에 따라 가능성영역이 변화하는 추이를 관찰하였다. 무연탄입자 연소의 경우 해의 다중성이 나타날 가능성은 적으며 입자표면온도가 높을 때 회분층에서 CO의 재연소반응은 무시될 수 있는 것으로 추론된다. A nonisothermal combustion model for a spherical anthracite briquette is developed and studied on the basis of the unreacted shrinking core model. The feasibility region, in which the solution must lie, is constructed and used for the prediction of the combustion characteristics. It turns out that the bounding curves of the feasibility region may be determined by analyzing the three limiting cases known as the single ash layer model and the double ash layer model. This treatment enables us to find the upper and lower bounds of the unreacted core surface temperature corresponding to various particle surface temperature. The solutions of the limiting cases provide expressions for the upper and lower bounds of the mo'1ar fluxes of the reactants and products as well as those of the energy flux at the particle surface. Also examined is the way how the feasibility region changes as the combustion proceeds. In the case of anthracite briquitte combustion it is unlikely that multiple solutions may exist and it is deduced that the oxidation reaction of carbon monoxide in the ash layer may be neglected when the particle surface temperature is sufficiently high.
Lhee, Sang Choon Architectural Institute of Korea 2014 Architectural research Vol.16 No.2
Risks, uncertainties, and associated cost overruns are critical problems for construction projects. Cost contingency is an important funding source for these unforeseen events and is included in the base estimate to help perform financially successful projects. In order to predict more accurate contingency, many empirical models using regression analysis and artificial neural network method have been proposed and showed its viability to minimize prediction errors. However, categorical factors on contingency cannot have been treated and thus considered in these empirical models since those models are able to treat only numerical factors. This paper identified potential factors on contingency in transportation construction projects and evaluated categorical factors using the one-way ANOVA statistical method. Among factors including project work type, delivery method type, contract agreement type, bid award type, letting type, and geographical location, two factors of project work type and contract agreement type were found to be statistically important on allocating cost contingency.
Lhee, Duckhyun,Yang, Eun Chan,Kim, Jong Im,Nakayama, Takuro,Zuccarello, Giuseppe,Andersen, Robert A.,Yoon, Hwan Su Elsevier 2017 Protist Vol.168 No.2
<P>The thecate filose amoeba <I>Paulinella chromatophora</I> is a good model organism for understanding plastid organellogenesis because its chromatophore was newly derived from an alpha-cyanobacterium. <I>Paulinella chromatophora</I> was the only known photosynthetic <I>Paulinella</I> species until recent studies that suggested a species level of diversity. Here, we described a new photosynthetic species <I>P. micropora</I> sp. nov. based on morphological and molecular evidence from a newly established strain KR01. The chromatophore genome of <I>P. micropora</I> KR01 was fully determined; the genome was 976,991bp in length, the GC content was 39.9%, and 908 genes were annotated. A pairwise comparison of chromatophore genome sequences between strains KR01 and FK01, representing two different natural populations of <I>P. micropora</I>, showed a 99.85% similarity. Differences between the two strains included single nucleotide polymorphisms (SNPs) in CDSs, which resulted in 357 synonymous and 280 nonsynonymous changes, along with 245 SNPs in non-coding regions. Indels (37) and microinversions (14) were also detected. Species diversity for photosynthetic <I>Paulinella</I> was surveyed using samples collected from around the world. We compared our new species to two photosynthetic species, <I>P. chromatophora</I> and <I>P. longichromatophora</I>. Phylogenetic analyses using four gene markers revealed three distinct lineages of photosynthetic <I>Paulinella</I> species including <I>P. micropora</I> sp. nov.</P>
아동의 창의성 개발을 위한 디자인 교육프로그램에 관한 연구
이정아(Lhee, Jung Ah) 한국디자인지식학회 2013 디자인지식저널 Vol.26 No.-
“예술이 교육에 미치는 놀라운 효과”라는 유네스코 연구 프로젝트 저서에서는 “와우”라는 감탄사에서 예술교육은 시작된다고 첫머리에서 서술하고 있다.” 감탄사가 연발될 정도로 아이들의 호기심을 자극하여 상상력과 잠재되어 있는 창의력을 계발시키는 디자인프로그램의 개발은 매우 중요하며 조기에 교육시키는 것이 무엇보다 효과적이기에 그 시기도 중요하다고 하겠다. 영국이 디자인 강국이 될 수 있었고 수많은 예술가와 과학자의 배출은 조기 디자인 교육의 힘이라고 많은 학자들이 지적하고 있다. 창의성은 문제 해결능력을 가지게 되므로, 창의적인 리더십과 문제 해결 능력은 현 21세기 통섭의 시대를 살아가는 데 있어서 가장 필요한 능력이다. 본 연구는 디자인 조기교육의 이론적 근거를 기초로 하여 창의적 통합적 문제해결 프로세스를 중심으로 어린이를 위한 체험 중심의 디자인 조형교육 프로그램을 연구하였다. 이를 통하여 창의력 향상을 위한 해결방안을 제시하며 향후 디자인 조기교육 프로그램이 우리나라의 교육 실정에 적합하게 적용할 수 있도록 제안하고자 한다. 유·아동 시기에 이루어지는 디자인교육은 창의력 개발에 많은 지대한 영향을 미치게 된다. 따라서 현재 창의적 디자인 조기교육의 문제점의 대안으로 한국형 디자인조형교육 프로그램 개발의 필요성을 강조하며, 조형입체디자인 프로그램의 일환으로 바우미(Baumi) 프로그램을 제안하고자 한다. At the opening of UNESCO research project “Remarkable Effect on Arts Education” describes that the art education begins from “Wow!” the exclamations. Development of the design program which stimulates children’s curiosity with exclamations to improve the imagination and creative potential is very important, and the most effective when it is applied as early childhood education. Many scholars have been pointed out that one of the reasons how Great Britain has such a strong design power and could be the emission of numerous artists and scientists is the early childhood design education. This thesis studied focusing creative integrated problem solution with experienced-oriented early childhood education program which is based on early childhood design education theory for children. The study suggests the answers to improve creative ability and apply the early childhood education program to the education system in Korea. Design education in early childhood brings profound impact on the development of creativity. Therefore, this study emphasizes the necessity of Korean style early childhood design education program as an alternative to the current problems in creative early childhood design education and suggests “Baumi” program as a part of formative design activity.