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강대우,이신,김상욱 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2
발파로 인한 환경적 문제는 주로 진동과 폭음에 대한 영향이나, 발파로 인한 파쇄도 및 경제성에 관해서도 효율적인 발파공법들이 많이 개발되고 있다. 이러한 문제를 해결하기 위한 방법으로 선진국에서 많이 사용되는 방법이 air decking을 이용하는 발파방법이다. 이미 선진국의 발파현장에서는 air decking 기술을 이용한 다양한 발파방법으로 VARI-STEM, GAS-BAG, POWER DECK 등이 이용되어지고 있다. 본 연구에서는 이들 중에서 Air ball 제품을 이용한 발파공법에 대하여 연구하고 국내 현장적용과 효과에 대하여 분석하였다. 그 결과 발파진동의 경우에는 약 30 ~ 40% 정도의 감쇄효과가 나타났고, 화약량의 경우 20 ~ 25%정도의 감소를 보였다. 또한 폭음의 경우에도 Air ball을 이용한 발파가 효과적이었으나 분석결과의 결정계수가 낮아 이는 더 많은 실험을 통하여 다시 분석해야 할 것으로 생각된다.
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이대원,김채웅,김재민 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.2
Growth of plants in greenhouses is increasing in popularity across Korea. Automatic hybrid environmental hardware system, including main module, display module, sensor module, input module, output module with one chip CPU controller, EPROM, SRAM, multi task interrupt controller, operating equipment and many sensors, appears to be an attractive alternative to the use of manual labor for accomplishing this task. Each module was made to slots, which are very convenient to mount and take off. Also, it is managed easily to repair, add, remove, and change their function and expansion. This research developed the hardware system for automatic hybrid environmental control. Separate programs for control of the hardware and for optimal analysis of the software, written Visual Basic, Turbo-C and Assembler, were developed to make the automatic hybrid environmental control system operated. The objective of this research designed and constructed a hybrid environmental hardware system for the optimal growth of plants within a greenhouse environment.
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이대일 명지대학교 예체능연구소 1996 藝體能論集 Vol.6 No.-
Efforts to establish a Korean-style design culture is not only meaningful in terms of creating a new product value in the world design market but also in terms of reaffirming our national identity. Much like a national language, art is a viable medium of expression, and as such, it can communicate the sentiments and sensibilities of the nation to which it belongs. However, in order to formulate designs that are unique Korean, we must first install a new understanding of the plastic aesthetics inherent in our traditional cultural products. This is not the kind of enterprise we can ascribe to the notion of naturalism generally expounded by art historians. Rather it entails the establishment of a more precise concept of plastic art, which better addresses our own uniqueness. This is the reason that the aesthetic value of a craft society, entailed in the creation of a product, cannot readily assert itself as the aesthetic value of an industrial society. Furthermore, designers must be given greater first-hand exposure to traditional cultural products, so that they may accept the intrinsic plastic aesthetics as texts for their own creative endeavors to produce design products that are uniquely Korean. This is because conceptual language can only go so far in describing in sufficient detail the fundamental properties of a given shape. However, the potentials hitherto discussed is confined to short term prospects, for in the long run design products of countries around the world will eventually be marked by their similarities rather than by its differences. The concept of originality will inevitably involve individuality rather than cultural deviations, and it will become possible through group distinctions rather than through national distinctions.
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蘇大和 명지대학교 1983 明大論文集 Vol.14 No.-
The characteristics of the ignition time with respect to the engine speed(r.p.m) was studied in theoritically to the conventional capacitor discharge ignition(C.D.I.) system which is used in the small gasoline engines. In this system, we found that the advanced angle of the ignition time decreased when the engine speed was increased because of the circuit reactance. It is very disadvantageous for the engine efficiency and it decreases the engine power by increasing the operation speed. In this study, we will discuss the disadvantages of the above, and propose the desirable circuit and design methods of the C.D.I. system for small 2 stroke gasoline engines.
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한대열,김성훈,김종화 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
In increased scale enterprise web environment, the role based access control is effective technology which reduce to complexity and cost of access control. For the role based access control is safely realized on the web, the user property that included role, group, permission and authentication information must be ensured authentication, integrity and security. To satisfy this requirement, we designed and implemented secureRBAC Architecture that consider control flow to transmit user property securely.
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(Ba·Pb)TiO₃세라믹 반도체의 큐리점 이동에 관한 연구
소대화,강기성 明知大學校 産業技術硏究所 1988 産業技術硏究所論文集 Vol.7 No.-
When Sb₂O₃as a dopant is added into commerical BaTiO₃and BaTiO₃made by solid Synthesis with 3aCO₃and TiO₂, the electrical conduction is increased in more efficient way. The addition of PbTiO₃ to BaTiO₃ by 10 mole %, 20 mole %, 40 mole % respectively cause tile curie points to occurs at higher temperature than that of pure BaTiO₃(Tc= 120℃). In case of PbTiO₃additions, the curie point shows about 4℃ increase by 1 mole%. In accordance with the mole ratio of PbTiO₃, the condition of sintering temperature for the specimens of (Ba.Pb) TiO₃was also changed ; when the ratio of PbTiO₃ was increased, the optimal sintering temperature was lowered.
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