자기손상자현 스마트 콘크리트 개발

김이성,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose performance degradation of concrete structures is generally caused by deteriorations, such as surface collapse, pop-out, crack, and so on. It may result in serious defects of the concrete structures. Thus it is very important 세 detect and repair the defects of concrete structures within a proper time to assure the structural safety. However, the defects due to the deteriorations are usually difficult to find by visual inspection. A sensor is developed in this study, which may give early indication for degradation of concrete structures and show the location of the damage. Cracks can be defected by the liquid in a small glass capsules which are embedded in the concrete structures. This paper discusses the applicability of that was developed smart concrete.

X-線 廻折方法에 依한 Sodium Chloride 單結晶의 構造 硏究

金文執,尹和重,徐日煥 충남대학교 자연과학연구소 1981 忠南科學硏究誌 Vol.8 No.1

The procedure for the crystal structure analysis by means of the X-ray powder diffraction method has been shown using the sodium chloride as a sample. The twelve X-ray diffraction intensity peaks for sodium chloride powder were collected rotating 2θhkl. Bragg angle of X-ray diffractometer from 20 to 160 degrees, in which Cu Kα radiation filtered by nickel had been used. For assigning indices of each reflecting plane, the relationship between lattice parameter and interplanar spacing has been used. This result has shown that sodium chloride is face-centered cubic, space group ?? with unit cell dimension a=5.63Å and z=4. The experimental and theoretical integrated intensities of the reflecting planes are in good agreement with each other.

蜃氣樓효과를 이용한 熱壙散率 측정에 관한 硏究

金大植,尹和重 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2

The experimental techniques and theory for the mirage effect, or optical probe beam detection of thermal waves in opaque solids have been described in the literature. Recentry, it has also been demonstrated that this technique can be applied to measurements of thermal diffusivities of solids. In particular, measurements of the transverse optical probe beam deflection angle in mirage effect thermal wave detection can provide a direct and accurate determination of the thermal diffusivity constant. In this paper we present the results of such measurements carried out in the laboratories on a number of pure materials, including single crystals of various elements, silicon carbide and silicon nitride ceramics, compound semiconductors and metal alloys.

유리관을 이용한 스마트 콘크리트의 개발

김이성,윤종문,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The R.C building will be superannuated if time passes. This cause is generated by propagation of a crack. In order to notice such a crack, time and efforts, expense, etc, that have exhausted. Various technologies were developed to improve its properties related to strength and workability during construction. Performance degradation of concrete structures is generally caused by the deteriorations, such as surface collapse, pop-out, crack, and so on. The deterioration mechanism of concrete is very complex. Detection of the degradation and fracture inside of concrete is also very difficult. A method to detect or cure the concrete crack have been developed in this study. They are by using small glass-pipe sensors. Experimental study shows good performance for detecting crack(small glass-pipe sensors) inside of the concrete.

가네트를 활용한 고강도콘크리트의 고온수열 후 잔존압축강도특성

김동익,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The study which it describes the high concrete which industrial by-product used garnet powder was quality of residual strength after heating. The test unit water content 160kg/m', water reunion ratio did with 30%, 35% and the aggregate ratio is 40%, 42%, 44%, displacement ratio admixture is 0%, 10%, 20%. Admixture garnet powder, fly ash, blast-furnace slag and it was compared with the residual strength of concrete after was heated to normal temperature, 50℃,100℃, 150℃, 200℃, 350℃, 500℃, 600℃, 800℃.With this test was got the next conclusion. To previously 350℃, the weight reduction was not big, it was visible the weight reduction which was sudden from 350℃, and it showed the aspect which also the compressive strength reduction is identical. It compared with admixture nothing replacement concrete, garnet replacement concrete relatively weight reduction and compressive reduction appeared small. Like this tendency recording where the replacement ratio will be increased the tendency which appeared relative small.

X-線 廻折法에 依한 Aluminum의 構造 硏究

金彰鎭,尹和重,徐日煥 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2

The structure of aluminum crystal has been determined from nine independent reflections collected on an X-ray powder diffractometer using nickel-filtered Cu K_α radiation. The crystal is face-centered cubic, space group F4/m3￣2/m, with a=4.045(2) Å, V=66.40 Å^3, D_c=2.69gr/㎤. The aluminum atoms have cubic arrangement to form metallic bonding and the nearest interatomic distance is 2.86 Å. The experimental and theoretical integrated intensities of the reflecting planes are in good agreement with each other.

X-RAY DIFFRACTION METHOD에 의한 COPPER METAL의 구조 고찰

金文執,尹和重,徐日煥 충남대학교 자연과학연구소 1980 學術硏究誌 Vol.7 No.1

The eight X-ray diffraction intensity peaks for copper powder were collected rotating ^(2θ)hkl angle of X-ray diffractometer from 30 degrees to 150 degrees, in which copper target had been used. Each reflecting plane has been identified by means of the relationship between latticeparameter and interplanar spacings, and this result has shown that copper has a face-centered cubic structure and a_(Cu) = 3.6136±7.32 ×10^(-4)Å. The experimental and theoretical integrated intensities of the reflecting planes are in good agreement with each other,

가네트를 활용한 고강도 콘크리트의 황산염저항성 특성 연구

윤종문,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The purpose of this study is about to characteristic of sulfate resist performance following precipitation age of high strength concrete using the garnet minute power. Experiment was compared to the weight change and compressive strength to follow that unit water content 160kg/m³, W/B 30%, 35% and fine aggregate ratio(S/A) 40%, 42%, 44%, admixture(garnet minute power. fly ash) 0%, 10%, 20% and precipitation age. We got the conclusion of the downside through the experiment. Garnet concrete was appeared that was superior to sulfate resist performance by the increasing of garnet. Case of the W/B 30%. garnet concrete did not get up the diminution of weight to follow that small mixing ratio of S/A and expressed diminution of weight the increasing in ratio of S/A. Consequently. If we should make concrete as condition of optimum mixture. we will be expected the effect of sulfate resist performance.

압전소자를 이용한 광음향 스펙트럼에 관한 연구

윤화중,금채,허복회,김유배 충남대학교 자연과학연구소 1988 忠南科學硏究誌 Vol.15 No.1

The development of photoacoustic spectroscopy(PAS) was carried out for liquid sample by using piezoelectric transducer(PZT). In order to carry out the work the cell was designed and made, and its characteristics of frequency responses were investigated. The PAS of distilled water was obtained by using the cell and detected by PZT in visible lights wavelength range of 400∼500nm from Halogen lamp light source. According to this study, it shows that the development of PAS for liquid sample by using PZT is more easier and simpler than by using microphone detector.

지하수를 이용한 저온단일 육묘에서 품종 및 필름종류와 포트크기가 딸기의 생육 및 수량에 미치는 영향

김운섭 ․ 윤화모 배재대학교 자연과학연구소 2011 自然科學論文集 Vol.22 No.1

This work was carried out to investigate growth characteristics of the underground water-treated strawberry by different type of film and pot size. The flower bud differentiation of ‘Maehyang’ was taken 27 days after treatment of cold water curtain and 8 hours short-day. Among ‘Maehyang’, ‘Nyoho’ and ‘Akihime’, ‘Maehyang’ and ‘Nyoho’ needed same days for the flower bud differentiation, whereas ‘Akihime’ needed fewer days than the others. Also ‘Maehyang’ and ‘Akihime’ reguired same days for the flower bud development. The white & black plastic film in addition to silver color plastic film were helpful for the flower bud differentiation by short-day condition than the only black plastic film because they kept the low temperature at night. Flower bud differentiation were promoted by pot seedling than that of non-provisional temporary planting. The optimal pot size were 100 mL and 115 mL volumed pots which shows satisfactory root development.