• 접착 및 계면
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• 제14권1호
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• pp.28-35
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• 2013

본 연구에서는 표면처리된 Ga-doped ZnO (GZO)를 사용해서 태양열 차단 코팅제를 제조하였으며, 표면처리 화합물의 종류와 처리조건에 따른 입자의 분산성, 가시광선투과율, 자외선차단율, 적외선차단율, 단열특성 등에 대해서 고찰하였다. IPA나 아크릴 바인더를 사용했을 때에는 무기산화물 입자의 분산특성이 낮았으나, 무기산화물 입자를 우레탄(우레아)기와 아크릴기 그리고 실리카를 포함하는 하이브리드 화합물로 표면처리한 경우에는 입자의 분산성이 향상되어 침전되는 입자가 거의 발생되지 않았고 가시광선 투과율과 헤이즈(haze)가 크게 향상되었다. 그리고 실제 단열특성을 평가하기 위해서 단열평가 장치와 sunlamp를 사용하였으며, 평가결과 열차단 필름을 사용한 경우 PET 필름 자체만 사용했을 때와 비교해서 내부온도가 $4.8^{\circ}C$ 이상 낮은 것으로 확인되었다.

• 한국지반신소재학회논문집
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• 제18권1호
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• pp.55-65
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• 2019

본 연구에서는 최근 발생빈도가 증가하고 있는 지반함몰의 가장 큰 영향요소인 지중 공동에 대하여 콘크리트매트를 이용한 개착식 복구방법의 보강효과 분석을 위한 실험적 및 수치해석적 연구를 수행하였다. 먼저, 평판재하시험을 이용하여 지표로부터 10cm, 20cm, 30cm의 보강깊이에 대하여 콘크리트매트 보강에 따른 응력감소율을 평가한 결과, 약 60%의 응력감소 효과를 나타내었다. 또한 실내실험과 수치해석 결과를 이용하여 지반침하량과 응력감소율을 분석한 결과, 콘크리트매트 설치깊이가 지표로부터 10cm~20cm 깊이에서 보강효과가 우수한 것으로 확인되었다. 지반변형계수 측정을 위한 LFWD실험 결과, 콘크리트매트가 지표로부터 20cm의 깊이에 보강되었을 때의 변형계수가 가장 크게 나타났다. 따라서 지중 매설물 손상에 의한 지중공동이 포장체 하부까지 높이 방향으로 발달한 경우, 지표로부터 20cm 이내에 콘크리트 매트를 보강하는 것이 효과적인 것으로 분석되었다.

• 한국수산과학회지
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• 제47권5호
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• pp.545-555
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• 2014

To develop Korean-style cut noodles with enhanced protein and calcium levels, we manipulated the ratio of dried anchovy Engraulis japonicus soup base residue powder to wheat flour, using a response surface methodology based on trained panel trials to determine the optimum ratio. Texture analysis and nutritional evaluation were also performed on cut noodles containing dried anchovy soup base residue (CNAR). Higher umami taste and springiness, and lower fishy flavor were strongly correlated with overall acceptability. The optimal CNAR formulation consisted of wheat flour (96.02 g), anchovy residue powder (2.67 g), and water (50.64 mL). CNAR had lower gumminess and adhesiveness (P<0.001), but higher springiness, cohesiveness (P<0.001), and chewiness (P<0.05), than the control (original wheat flour cut noodles). The addition of anchovy soup base residue elevated protein, lipid, and ash levels relative to the control. Color values decreased with increasing residue powder content. In vitro protein and starch digestibility of CNAR were lower than in the control (P<0.001). CNAR yielded significantly higher total free amino acid content than the control (P<0.01), leading to CNAR's improved palatability. Dried anchovy soup base residue can be used in wheat flour cut noodles to improve nutrition, sensory acceptability, and profitability.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.725-730
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• 2005

In case of the national roads which is opened in the past, there are carried out the expansion and improvement for enlargement of the traffic demand by industrial development and safety road operation to narrow of road width and serious change of the road alignment with effect of topography and graphical features of a mountain. A protection method using vegetation in the cut-slope has been constructed for harmony of ambient environment after cutting the slope recently. But it requires a study because the surface lose and the failure have been occurred in the large cut-slope which is covered by vegetation. In this study it was presented a countermeasure and examined a stability of contained uncertainty in the cut-slope according to the failure example of the cut-slope which is covered by vegetation. The additional research will be necessary against the development of the investigation technique which executes the stability investigation of the cut-slope which is covered by vegetation.

• 화약ㆍ발파
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• 제20권2호
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• pp.7-19
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• 2002

The cut is placed high up in the section, the 1st sloping holes below the cut, and divided all the holes located below the 1st sloping holes into a certain area with longitudinal section, to lower pollution made from tunnel blasting. With the sequential blasting machine, after I first blasted holes around the cut holes by a pre-splitting method, blasted the cut area and the 1st sloping holes. The 1st and 2nd sloping holes divided areas are initiated gradually to free face upwards made by the cut. Especially, I pre-splinted contour holes previous blast the before sloping holes from the contours. The ground vibration from the earth surface just over the advance face decreased about 42.0% compare with the down blasting method under the condition of equal charge weight per delay. I controlled the crack and over break of the mother rock by pre-splitting contour holes before blast the first sloping holes from the contours. The peak values of noise and air blast by blasting decreased about 10dB more than the down blasting method. the noise and air blast diminished gradually as a round. The throw distance of the fly rock was decreased about 55%.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.332-335
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• 2001

The surface roughness is one of the important parameters to evaluate the quality of products. Its level must be limited to a certain range in the precision components. This paper deals with grinding characteristics of workpieces by the wear amount of wheels in the surface grinding process. The surface roughness was measured according to the feedrate and the depth of cut with respect to the various workpieces. In addition, the wear amount of wheels according to the number of grinding pieces was obtained.

• 천문학회지
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• 제13권1호
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• pp.27-33
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• 1980

Surface density distributions for globular clusters were obtained from photoelectric surface photometry (using centered aperture photometry). These surface brightness profiles were then compared with the theoretical surface density distribution of King's model. From the comparison of the theoretical and observed surface density distributions, we determine he structural parameters of the clusters (the core radius $r_c$, the tidal cut off $r_t$, and the concentration factor C).

• 한국기계가공학회지
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• 제12권5호
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• pp.36-41
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• 2013

One of the problems in grinding process using a machining center(MC) with a small diametric wheels is machining error due to decrease of the quill diameter. In this study, side-cut grinding is performed with a vitrified bonded CBN wheel on the machining center. Grinding experiments are performed at various grinding conditions including quill length, quill diameter and depth of cut. The effect on the grinding force, machining error and surface roughness due to the change of the quill rigidity are investigated experimentally. The slenderness ratio of the quill is significant factor to analyse the change of the grinding force and machining error.

• International Journal of CAD/CAM
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• 제3권1_2호
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• pp.1-12
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• 2003

When milling concave corners, cutter load increases momentarily and fluctuates severely due to concentration and uneven distribution of material stock. This abrupt change of cutter load produces undesirable machining results such as wavy machined surface and cutter breakage. An important factor for studying cutter load in 2.5D pocket milling is the instantaneous Radial Depth of Cut (RDC). However, previous work on RDC under different corner-cutting conditions is lacking. In this different corner shapes. In our work, we express RDC mathematically in terms of the instantaneous cutter engage angle which is defined as Cutter Swept Angle (CSA). An analytical approach for modeling CSA is explained. Finally, examples are shown to demonstrate that the proposed CSA modeling method can give an accurate prediction of cutter load pattern at cornering cut.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1782-1788
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• 2007

This study analyzed ground settlement and ground stress depending on tunnel excavation and the ground reinforcing grouting methods for double line road tunnel through deep weathered zone. Diameter of double line road tunnel was approximately 12m and umbrella arch method and side wall reinforcing grouting were applied. The ring-cut split excavation method and CD-cut excavation method for excavation method were applied. Analysis of failure rate and vertical stress ratio show that the tunnel for which the height of the cover(H) was higher than four times the diameter, it can be considered a deep tunnel. Comparisons of various excavation and ground reinforcement methods were showed that CD-cut method results in lower surface and crown settlement, and lower failure rate than where using Ring-cut split method. In addition the side wall reinforcing grouting resulted in reduction of tunnel displacement and settlement.