• Journal of the Korea Institute of Military Science and Technology
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• v.21 no.2
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• pp.166-172
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• 2018

To develop and evaluate the real-time SAR(Synthetic Aperture Radar) motion measurement system, true antenna phase center(APC) positions during SAT(Synthetic Aperture Time) are needed. In this paper, CDGPS(Carrier phase Differential Global Positioning System) post processing method is proposed to get the true APC position for spotlight SAR image formation. The CDGPS position is smoothed to remove high frequency noise which exists inherently in the carrier phase measurement. This paper shows smoothed CDGPS data is enough to provide the true APC for high-quality SAR image formation through motion measurement result, phase error estimation and IRF(Impulse Response Function) analysis.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.166-166
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• 2013

최근에 희토류 이온이 도핑된 형광체를 발광 소자, 레이저, 섬광재료, 광섬유, 촉매, 디스플레이와 같은 다양한 분야에 응용하기 위한 연구에 상당한 관심이 집중되고 있으며, 희토류 이온이 도핑된 발광 물질은 음극선관, 램프 조명, 플라즈마 디스플레이, X선 검출기, 전계 방출 디스플레이 소자를 포함한 다양한 영역에 응용되고 있다. 본 연구에서는 고상 반응법을 사용하여 발광 효율이 높은 적색과 주황색 형광체를 제조하고자 서로 다른 활성체 이온 Eu3+, Sm3+의 농도를 변화 시키면서 두 종류 Ca1-1.5xTa2O6:Eux3+와 Ca1-1.5xTa2 O6:Smx3+ 형광체 분말을 합성하였다. 특히, 활성제 이온의 농도비에 따른 형광체 분말의 결정 구조, 표면 형상, 입자의 크기, 흡광과 발광 특성을 측정하였다. 그림은 활성체 이온의 함량비를 달리하여 합성한 Ca1-1.5xTa2O6:Eux3+, Ca1-1.5xTa2O6:Smx3+ 형광체 분말에서 측정한 흡광(photoluminescence excition) 스펙트럼의 결과를 나타낸 것이다. 여기 파장 399 nm로 여기 시킨 Ca1-1.5xTa2O6:Eux3+ 형광체 분말의 경우에, 발광 세기가 가장 강한 617 nm의 주 피크가 관측되었다. 또한, 여기 파장 410 nm로 여기 시킨 Ca1-1.5xTa2O6:Smx3+ 형광체 분말의 경우에는 발광 세기가 가장 강한 주 피크는 609 nm에서 나타났다. 실험 결과로부터, Eu3+와 Sm3+ 이온이 각각 도핑된 CaTa2O6 형광체의 경우에는 색 순도가 높은 파장과 발광 세기는 Eu3+ 이온인 경우에 0.15 mol, Sm3+ 이온이 도핑되는 경우에는 0.05 mol이 최적의 합성 조건임을 알 수 있었다.

• Korean Journal of Plant Resources
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• v.34 no.2
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• pp.166-171
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• 2021

This research was conducted to investigate the effect of foliar application of 6-benzylaminopurine (BA), sprayed weeks after pinching (SWP), on ornamental usage of Veronica longifolia L, which is native to Korea. Foliar application of 0, 500, 1,000, and 2,000 mg/L BA on 10 cm long V. longifolia L. plant was evaluated at 0, 7, and 14 days after pinching for growth and flowering. The maximum result of multiple shooting was seen in the 2,000 mg/L BA at 1 week after pinching, and almost all the treatments showed dwarf growth in V. longifolia L. The number of days to flowering was delayed by BA treatments. Moreover, the length and the number of flowers decreased with high concentrations of BA. Thus, foliar application of BA via pinching technique can improve the ornamental usage of V. longifolia L. by controlling the plant type.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.166-167
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• 2015

Because of energy crisis at all around the world, there is many method and system which for improving energy efficiency has appeared in construction industry. And then, 20% of entire building energy loss is emissed to exterior of buildings, that is important to building's entire energy efficiency. So, many research has been conducted for imporve exterior energy efficiency and generally it called insulation of wall. Method for wall insulation can be classified interior system and exterior system which defined installation place of insulation board whether interior or exterior of structural wall. However, interior system has thermal problem such as thermal-bridge which can be necessarily occur condensation. and exterior system has constructional problem such as difficult to construction because exterior and finish work so expensive construction cost than other insulation method. Thus, sandwich insulation wall system has been appeared for solving these problems. Sandwich insulation system must using wall connecting things because both side walls is divided by center insulation. At this, Through the heat at wall connecter, it can be occured thermal-bridge and broken insulation board when under construction will be bring negative effect by reducing wall thickness and insulation deficit. At this study, we were compared previous sandwich insulation system and analysis these system's problem for develop the improving constructability and performance of sandwich insulation system.

• Magazine of the Korea Concrete Institute
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• v.9 no.3
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• pp.157-166
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• 1997

The object of this study was invest, igat, ing the failure phenomenon in the contact zone of rcpnired concrete structures due to the external climate change(hygral transient condition). This study was carrie out by calculating the non-stationary moisture and stress distribution in the repaired concrete structures with the cement mortar. In this analysis, main variables were the overlay thickness (Do=0.5-2.5cm). and the pre-wetting time(tc= l-5days). and the cxtcrnal 1.~1ative humidity(Ho=50-80%). The results show that the minimum overlay thickness and the minimum pre-wetting time are necessary to k e ~ p compressive stresses in the contact zone for a relative humidity.

• Transactions on Electrical and Electronic Materials
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• v.7 no.4
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• pp.163-166
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• 2006

The dishing and the erosion were evaluated on the tungsten CMP process with conventional and new developed slurry. The tungsten thin film was polished by orbital polishing equipment. Commercial pattern wafer was used for the evaluation. Both slurries were pre tested on the oxide region on the wafer surface and the removal rate was not different very much. At the pattern density examination, the erosion performance was increased at all processing condition due to the reduction of thickness loss in new slurry. However, the dishing thickness was not remarkably changed at high pattern density despite of the improvement at low pattern density. At the large pad area, the reduction of dishing thickness was clearly found at new tungsten slurry.

• Journal of Mechanical Science and Technology
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• v.20 no.1
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• pp.158-166
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• 2006

Extended Graetz problem in microtube is analyzed by using eigenfunction expansion to solve the energy equation. For the eigenvalue problem we applied the shooting method and Galerkin method. The hydrodynamically isothermal developed flow is assumed to enter the microtube with uniform temperature or uniform heat flux boundary condition. The effects of velocity and temperature jump boundary condition on the microtube wall, axial conduction and viscous dissipation are included. From the temperature field obtained, the local Nusselt number distributions on the tube wall are obtained as the dimensionless parameters (Peclet number, Knudsen number, Brinkman number) vary. The fully developed Nusselt number for each boundary condition is obtained also in terms of these parameters.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2000.06a
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• pp.166-172
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• 2000

Friction characteristics of phenolic resin-based friction composites containing threedifferent relative amounts of graphite and zirconium silicate were investigated by using a pad-on-disk type friction tester. Constant temperature test and constant interval test at three different initial temperatures(100. 200, 300$^{\circ}C$) were performed to examine the effects of friction heat on friction characteristics at elevated temperature. The friction composite(FMO.7) with higher content of ZrSiO$_4$showed unstable friction force at higher temperature and resulted in larger fluctuations of vibration during friction test. The abrasive action of ZrSiO$_4$in friction composite impeded stable transfer film and induced higher friction heat at friction interface. Friction oscillations according to the temperature were associated with the formation of transfer film(i'd body layer) on the friction composite and the counter part.

• Korean Journal of Veterinary Service
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• v.38 no.3
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• pp.163-166
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• 2015

The purpose of this study was to survey seroprevalence of porcine reproductive and respiratory syndrome (PRRS) virus and porcine circovirus-2 (PCV-2) in Gyeongbuk province by enzyme-linked immunosorbent assay (ELISA). A total of 966 samples collected from 21 pig farms were tested. The sero-positive rate of PRRS and PCV-2 were 77.6% (750/966) and 76.4% (738/966), respectively.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2005.04a
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• pp.159-166
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• 2005

The vibration on building structures due to exciting vibration forces has been studied only for the vibration level on existing buildings. Recently, several researches have been performed on the prediction of vertical vibration on structures by using an analytical method. However, these studies have been focused on mainly the vibration analysis through analytical modeling of structures. This study aims to investigate the characteristics of vertical vibration transfer in terms of the directions of transfer(upward transfer and downward transfer) on the shear wall building structures due to 2 type vibration forces. In order to examine the characteristics of vertical vibration transfer, the mode analysis and the impact experiment were conducted several times on one building structure. The results of this study suggest that the characteristics of vertical vibration transfer are different in terms of the directions of transfer.