• 농업생명과학연구
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• 제45권4호
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• pp.113-120
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• 2011

본 연구에서는 생마늘 추출 숙성물의 용매 분획물에 대한 항산화 효과와 acetylcholinesterase (AChE) 저해 효과에 대해서 조사하였다. 생마늘 추출 숙성물의 헥산, 클로포름, 에틸아세테이트 및 물 분획물을 통한 총 페놀성 화합물의 함량은 각각 3.70, 23.63, 31.27, 2.35 mg/g으로 나타났다. 또한, 에틸아세테이트 분획물이 ABTS radical scavenging activity, ferric reducing antioxidant power 및 linoleic acid를 활용한 지질의 자동산화 저해 효과에서 가장 높다는 것을 확인하였다. 추가적으로, PC12 신경 세포에서의 에틸아세테이트 분획물의 처리가 $H_2O_2$가 유발시키는 산화적 스트레스의 수준을 감소시켰다. 결국 생마늘 추출 숙성물의 에틸아세테이트 분획물이 농도 의존적으로 AChE를 저해한다는 것을 확인하였다. 그러므로 본 연구는 생마늘 추출 숙성물의 에틸아세테이트 분획물이 PC12 신경세포에 있어서 산화적 스트레스 수준을 감소시키고, 또한 AChE 저해제로서 활용될 수 있는 가능성을 확인하였다.

• Architectural research
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• 제8권2호
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• pp.17-26
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• 2006

This paper attempts to identify the term "tectonics" comprehensively by collecting and categorizing existing definitions of tectonics within the architectural area rather than to stress the concept of tectonics of each specific theorist. Although no consensus of opinion on the concept of tectonics exists, architectural tectonics was closely related to the following terms in three categories: 1. $techn\acute{e}$, technique, and technology; 2. construction and structure; and 3. stereotomics. Based on its etymology, system, and material construct, the notion of tectonics common in these three categories signifies "the art of framing construction," in which linear elements are connected with joints and clad or infilled with lightweight material. Thus, the art of framing construction, as a common concept of tectonics, reveals the following characteristics: First, tectonics is based on framing construction in contrast to piling-up construction as the etymology of tectonics signifies the art of carpentry. Then, the term tectonics, dealing as it does with a higher level of construction rather than the mechanical level of structure, incorporates the poetic aspect of techne as well as the rational aspect of technology. Third, Owing to the organic, double system of tectonic frame and incrusting or infilling materials, the tectonic body becomes both the ornament and the structure simultaneously. As the art of framing construction is based on material construction rather than structural or ornamental form, this paper proposes that one can view tectonics as a term that conveys the meaning of the actual material effect on space.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2000년도 International Symposium on Magnetics The 2000 Fall Conference
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• pp.247-248
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• 2000

• 한국재료학회:학술대회논문집
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• 한국재료학회 1993년도 춘계학술발표회
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• pp.118-119
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• 1993

Aluminium titanate (Al$_2$TiO$_{5}$) as structural ceramics is known as a low thermal exansion, a low thermal conductivity, a low Young's modulus, and excellent thermal shock resistant material. These properities allow for the testing as an insulating material in engines for portliner, piston bottom an turbo charger. However, those composites has low mechanical strength due to the presence of microcracks developed by the large difference in thermal expansion coefficients along crystallographic directions exceed the internal strength of material and its tendency to decompose into $Al_2$O$_3$ and TiO$_2$ at temperature below 130$0^{\circ}C$ limit however the application of aluminium titanate.e.

• 건축역사연구
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• 제11권4호
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• pp.7-19
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• 2002

If we compare socio-cultural aspects of the two historical periods known as 'pre-modern' 'modern,' it would seem that the Aristotelian understanding of technology has difficulty explaining techno-cultural phenomenon of modern society. The problems are first that the discourse of scientific technology in the modern period has proceeded without a metaphysical base, and second that nothing in present culture regulates the limitations of scientific technology. The clear distinction between means and ends in the traditional approach is no longer valid in the jumble of interrelationships. Such complexity forces us to acknowledge that means and ends are relative and interchangeable, and that neither has a clear moral superiority over the other. Technology in modern society is no more a neutral means. The products of science do not always exist to serve human ends. In modem architecture and urban design, both its productive and destructive tendencies leave man and his society in an endless confusion of complexity and opposition. These problems of technology still result in unsolved question today. On this point, the discussion another currently prevalent attitude to technology, especially Heideggerian thinking in the below could give a somewhat clearer answer to the problem of modem architecture and technology, although it also comprises limited contemplation in itself.