유화제 첨가량이 MMA/BA 합성 라텍스 폴리머 시멘트 모르타르의 특성에 미치는 영향

형원길,조영철,장성주,김완기,소양섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The purpose of this study is to clarify the effect of the emulsifier ratio on properties of the polymer modified mortar using methylmethacrylate-buthyl acrylate(MMA/BA) latexes, and to obtain basic data necessary to develope appropriate latexes for cement modifiers. Polymer modified mortars using MMA/BA latexes are prepared with various monomer ratios, and tested for air content, flexural and compressive strengths. From the test results. we knew that the water-cement ratio is decreased with an increase in the amount of emulsifier. And the air content is increase with an increase in the polymer cement ratios. In general, the superior compressive and flexural strength of polymer-modified mortars using MMIA/GA latexes is obtained ant a bound MMA content of 80 percent and a emulsifier ratio of 6 percent.

모노머비에 따른 MMA/EA 합성 라텍스 폴리머 시멘트 모르터의 성질

형원길,김완기,소양섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to clarify the effect of the monomer ratio on properties of the polymer-modified mortars using methyl methacrylate-ethyl acrylate latexes, and to obtain basic data necessary to develop appropriate latexes for cement modifiers. This paper deals with the effect of the monomer ratio on the typical properties of polymer-modified mortars with methyl methacrylate-ethyl acrylate latexes. The polymer-modified mortars using MMA/EA latexes are prepared with various polymer-cement ratio, and tested for strengths, water absorption, and chloride-ion penetration depth. The test results indicate that the monomer ratio is very important factors to characterize the strength properties of polymer-modified mortars, but the water absorption and chloride-ion penetration depth are influenced by polymer-cement ratio rather than monomer ratios.

열전 반도체를 이용한 냉수기 개발에 관한 연구

이원희,정순원,구경완,이명섭 永同大學校 1997 硏究論叢 Vol.3 No.1

본 논문에서는 기존의 냉매 대신에 열전 소자를 사용하여 구성한 냉수기가 갖는 여러 가지 장점 및 냉수기의 중요 소자인 TEC 모듈(Thermo Electric Cooler Module)에 대한 최대 효율 구동 방법 등을 연구하였다. 또, 열교환기의 재질 및 모양, 방열판과 냉각팬의 크기 등을 변화시키면서 냉수기로서 최적의 효율을 가질 수 있도록 냉수기를 설계하였고, 그 설계를 바탕으로 실험을 하여 TEC 모듈(Thermo Electric Cooler Module)을 이용한 냉수기가 상품화 가능성이 있는지를 검토하였으며, 그 결과를 기술하였다. We developed a new cooling system which applies TEC module using peltier effect. Our cooling system has better effiency and make smaller pollution than conventional cooling system. We applies that cooling system to making cool water dispenser. We designed the cold water dispenser of optimum effiency varying material, shape, and size of heat sink and cooling fan. The possibility of a commodity on this designed cold water dispenser is investigated.

개방 스터브를 갖는 평행결합선로의 해석과 응용

이원균,이홍섭,황희용 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B

In this paper, the exact analysis of the parallel coupled line with open stub is presented. This structure shows LPF characteristics with broad stopband and sharp skirt characteristics. We derived the exact Z-matrix expression of the structure. In order to show the validation of the expression we designed 3^(th) order Chebyshev LPF using the structure. The simulated data excellently agreed with the predicted values by the calculation using the derived expression.

정적-내연적 이론을 이용한 Cowl Top Otr 판넬 해석에 관한 연구

정동원,안현길,고형훈,문원섭 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.1

The static implicit finite element method has been effectively applied to analyze total cowl top otr panel stamping processes, which include the forming stage. Complicated and abnormal large size cowl top otr panel was analyzed by using commercial program called AutoForm. Analysis results examining possibility and validity of the AutoForm software and the factor study are presented. Furthermore, the simulated results for the total cowl top otr panel stamping processes are shown and discussed. Its application is being increased especially in the automotive industry for the cost reduction, weight saving, and improvement of strength.

스템핑 금형개발을 위한 SPCC소재와 SPCEN소재의 비교연구

정동원,안현길,문원섭 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

The static implicit finite element method is applied effectively to analyze total panel stamping processes, which include the forming stage. Complicated and abnormal large size panel was analyzed by using commercial program called Auto-Form. Analysis results examining possibility and validity of the Auto-Form software and the factor study are presented. Further, the simulated results for the total panel stamping processes are shown and discussed. Its application is being increased especially in the automotive industrial area for the cost reduction, weight saving, and improvement of strength.

쉘 요소를 이용한 박판 성형 공정 해석의 산업현장 적용에 관한 연구

정동원,고형훈,문원섭 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

Finite element analysis of sheet metal forming process is generally carried out by the explicit and implicit time integration method. And membrane, shell and continuum element are applied to finite element analysis. Membrane analysis can not provides sufficient information for the process which involve considerable bending effects. Shell element allows the consideration of bending effects, but involves too much computational time. In order to estimate in sheet metal forming processes used Auto-Form software using static-implicit method and shell element. Result, by applying this to an industrial site the productivity improvement and cost reduction etc. effect able was predicted.

적외선방사카메라를 이용한 변압기 부싱 온도분포 모니터링

임장섭,이우선,이영식 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

An electrical accident such as mishap electricity institution occurs frequently because of the increase of demand for electricity, complexity of electricity institution. The techniques that discovered a mishap to electricity institution are electric signal method and supersonic waves method, thermal sensing method by infrared rays. The IRR-camera which is effective monitoring method of electricity institution is diffused in industrial field. Specially, infrared rays monitoring can perceive heat which was visually poor observed objection. Also, infrared rays monitoring can monitor an area of difficulty of access of work human power. In this study, infrared rays monitoring of a transformer substation is periodically performed. The connection between possibility of application and operation, blazing fire occurrence and progress process of body and bushing of large capacity transformer are performed by IRR-camera.

벌꿀 및 당액의 혼합비에 따른 수분활성도 예측

심원근,이은현,강현아,장규섭 충남대학교 농업과학연구소 1995 농업과학연구 Vol.22 No.2

In order to distinguish the honey in the market whether it is real or not simply and conviniently, the changes of water activity was investigated due to the addition of starch syrup and sucrose solution to the honeys such as Korean, Acacia, Chestnut and Mixed. The regression equations were obtained to predict the water activity of the honeys. In general, the honey was below 21% in moisture, below 0.6% in ash, 420 to 710cP in the viscosity, 0.57 to 0.62 in the water activity and 77 to 80brix in sugar content. The water activity of the samples were higher as the quantity of starch syrup and sucrose solution added increased. Starch syrup was more influence than sucrose solution. The regression equations between water activity and starch syrup concentration of honeys were obtained and R^2 value were higher than 0.90.

우리나라 近代 學校體育에 관한 硏究 : 1876 ~ 1910을 중심으로 Centered 1876 to 1910

金文燮,元忠熙 公州大學校 스포츠科學硏究所 1996 스포츠科學硏究所論文集 Vol.- No.10

This study investigated physical activities of schools on the basis of the backgrounds to grasp what the school physical education were, how they were developed, and what the significance to the history of physical education in Korea is. In the history of modern physical education, the period of the modern physical education covered 1876 to 1945 - from the year of opening her harbors to the year of the Liberation. But this study excluded 1910 to 1945 - from the year of Japan's colonization to the year of the Liberation, for the education were not performed independently and voluntarily in colony. The period is divided into three according to clear distinctions. The first period is that of the birth of modern physical education. It starts from 1876 when the harbors were opended to the foreigners by Byong-ja-su-ho-jo-yak(丙子修護條約) and ends in 1885 when Christian private schools were established, during which the traditional military arts were educated in My-ye-hak-kyo(武藝學敎) and Won-san-hak-sa(元山學舍). The second period (1885-1904) is that of the reception, when western spots were introduced and physical education was reinforced with the importance of whole-person education. The last period is that of the fixation of modern physical education. It covers from Eul-sa-bo-ho-jo-yak(乙巳保護條約:1905) to Han-il-hab-byoung(韓日合倂:1910), during which nationalistic physical education was activated and the ideologies of modern physical education were established. The findings of the study are as follows: (1) The modern physical education in Korea was regarded as the means of physical training, which shows nationalistic trends. (2) The military arts were educated as formal curricula in the first period, and the military gymnastics was in the second period. And then, in the third period, the school gymnastics was educated for 2 or 3 classes a week as a compulsory subject. In comparison with 3 classes a week of these days, the curriculum of school physical education can be thought to have been formed in this period. (3) In the second period, Christian missionaries introduced western sports such as football, basketball, tennis, and so on, which were performed as extra-curricular activities. Such aspect gave the chance for the diverse curriculum of these days. (4) Won-dong-hoei(運動會), which was performed in Foreign Language School for the first time, was activated continuously. This made a contribution to the popularization of physical education and the formation of the regional culture of physical education. (5) In the process of the modernization of physical education, the concepts of recreation and sanitation added to the simple concept of physical training. And there was a try to systematize the theory of physical education. These enabled the concept of physical education to be extended.