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디스플레이용 유리의 눈부심 현상 억제를 위한 표면 에칭 및 돌기 형성에 관한 연구
우희수,강승구 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.6
In order to quickly and clearly recognize characters or images through display glass, glare of the glass must besuppressed. In this study, we tried to reduce glare by analyzing changes in glass surface shape and optical propertiesthrough etching process. The etching process was performed as a function of concentrations of the etching solutions, BOEand HF. During the etching process, a compound containing F ion was generated on the surface of the glass, forming anirregular pattern in the form of a projection, and thus various optical properties of the glass were changed; reflectance of2.5~4.6 %, haze of 4.5~6.6 %, transmittance of 77~92 %, and gloss of 82~107 GU. As a result, optimum etching conditionwas obtained to minimize the loss of other optical properties while suppressing glare of the glass. 디스플레이용 유리를 통해 문자나 이미지를 뚜렷하고 빠르게 인식하기 위해서는 유리의 눈부심 현상(glare)을억제해야 한다. 본 연구 연구에서는 에칭공정을 통해 유리 표면 형상 및 광학 특성 변화를 분석하여 눈부심 현상을 낮추고자 하였다. 에칭 공정은 에칭 용액인 BOE 및 HF의 농도를 변수로 수행하였다. 에칭과정에서 유리 표면에 F 이온이 포함된화합물이 생성되어 돌기(projection) 형태로 불규칙한 패턴을 형성되었고, 이로 인해 유리의 광학적 특성이 변화되었다; 반사율은 2.5~4.6 %, 탁도는 4.5~6.6 %, 투과율은 7 7~9 2%, 그리고 광택도는 82~107GU 범위. 그 결과 유리의 눈부심 현상을억제하면서도 다른 광학적 특성의 손실을 최소화하는 에칭 조건을 확보하였다.
유류 오염물질에 대한 불포화대 자연 저감능 등급화 기법 개발
우희수,안성남,김기범,박새롬,오성직,김상현,정재식,이승학 한국지하수토양환경학회 2022 지하수토양환경 Vol.27 No.S
Although various methods have been proposed to assess groundwater vulnerability, most of the models merely considerthe mobility of contaminants (i.e., intrinsic vulnerability), and the attenuation capacity of vadose zone is often neglected. This study proposed an evaluation model for the attenuation capacity of vadose zone to supplement the limitations of theexisting index method models for assessing groundwater vulnerability. The evaluation equation for quantifying theattenuation capacity was developed from the combined linear regression and weighted scaling methods based on the labscaleexperiments using various vadose zone soils having different physical and biogeochemical properties. The proposedsemi-quantifying model is expected to effectively assess the attenuation capacity of vadose zone by identifying the maininfluencing factors as input parameters together with proper weights derived from the coefficients of the regression results. The subsequent scoring and grading system has great versatility while securing the objectivity by effectively incorporatingthe experimental results.
국내 바이오가스화 시설 부산물의 퇴·액비 재활용을 위한 특성 평가
우희수,강준구,김규연,이광헌,송영우,박준범,이성수 한국폐기물자원순환학회 2012 한국폐기물자원순환학회지 Vol.29 No.8
The proper disposal of digestate from biogas plants has been focused while the use of biogas plants to treat organic waste has been considered as a way of green energy production. This study analyzed chemical and biological characteristics of two types of digestates from 6 domestic biogas plants for low cost and environmental recycling. The results showed that separated solids met current standard for compost within organic content, ratio of organic matter and NaCl concentration, although water content and maturity of separated solids did not meet the standard. Total content of N, P2O5 and K2O in separated liquids met current standard for liquefied fertilizer except that in separated liquids from sewage sludge, although NaCl content of separated liquids from food waste exceed the standard. Heavy metal content, coliform count and 2 kinds of harmful microorganisms were also detected below domestic standard for compost and liquefied fertilizer. These results suggested that digestates from biogas plants could be recycled to be fertilizer with additional treatment such as post-composting or salinity removal process.
TiO2가 첨가된 oxy-fluoride 계 유리의 발광특성에 미치는 열처리 효과 연구
우희수,강승구 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.6
In this study, the optical properties of CaF2-Al2O3-B2O3-TiO2 (CABT) system glass doped with rare earth ion,that is used in various light devices due to its excellent luminous properties, were analyzed as a function of kind of crystal phases formed and size of crystals generated in the glass matrix. TiO2 was added to control nucleation and crystallization,and Eu2O3 was added to enhance the luminescence characteristics. DTA analysis was performed to confirm the heat treatment condition o f crystal generation, and XRD and SEM analysis w ere carried out f or the crystal phase change of nanometer size. As a result of the analysis, the luminous properties of oxy-fluoride-based glass were improved duo to crystallization of nanometer size, but was rather degraded when excessively large crystals were generated. 본 연구에서는 광 발광특성이 우수하여 각종 광장치에 사용되고 있는 CaF2-Al2O3-B2O3-TiO2(CABT) 계 유리의 열처리 조건 및 결정상 생성에 따른 광학적 특성을 연구하였다. CAB 유리의 핵형성 및 결정성장을 제어하기 위해 핵형성제TiO2를 첨가하고, 발광 특성을 향상시키기 위해 희토류 이온 Eu2O3를 첨가하였다. 열처리 조건에 따른 결정 성장 특성을 확인하기 위해 DTA 분석을 수행하였으며, 이에 따른 나노 크기 결정상 변화에 대한 XRD 및 SEM 분석을 수행하였다. 분석 결과 100 nm 크기의 결정생성은 발광강도를 향상시키지만 그 이상의 큰 결정 입자생성은 오히려 발광 특성을 저하시켰다.
벤토나이트-해포석-구아검 혼합물질이 코팅된 제강슬래그의 해수에 대한 투수성 평가
정의석,이성수,우희수,박준범,Cheong, Eui-Seok,Rhee, Sung-Su,Woo, Hee-Soo,Park, Jun-Boum 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.4
Bentonite has been generally used as vertical cutoff barrier material and reported to have several problems regarding its low workability, drying shrinkage cracking by particle cohesion, and ineffective waterproof ability under sea water condition. In this study, the particle sealant, the furnace slag coated by the mixture of bentonite, sepiolite and guargum, was developed to compensate these weak points and the hydraulic conductivity of the particle sealant was evaluated. Drying shrinkage cracking and swelling index was estimated to find the optimal mixing ratio of bentonite, sepiolite and guargum. The hydraulic conductivity of the particle sealants having different amount of sealant (bentonite-sepioliteguargum mixture) coating the furnace slag was estimated using the rigid wall permeameter and flexible wall permeameter. The results showed that drying shrinkage cracking was not found in the bentonite-sepiolite mixture with 20% sepiolite contents and the results from free swelling tests for the sealant having 1 : 0.025, 1 : 0.05 and 1 : 0.075 of weight ratios of bentonite-sepiolite mixture and guargum under simulated sea water condition were higher than those for the bentonitesepiolite mixture without guargum under tap water condition. These three sealants were coated on the furnace slag with 50% and 60% of sealant in the particle sealant and the hydraulic conductivity was estimated. In the cases of the particle sealants having 20% sepiolite in the bentonite-sepiolite mixture and 1 : 0.075 weight ratio of the bentonite-sepiolite mixture and guargum, the hydraulic conductivity from the rigid wall permeameter was below $1.0{\times}10^{-7}$ cm/sec under simulated sea water condition. The hydraulic conductivity of the particle sealant having $1.0{\times}10^{-6}$~$1.0{\times}10^{-7}$ cm/sec by the rigid wall permeameter was estimated using the flexible wall permeameter and found to be below $1.0{\times}10^{-7}$ cm/sec.
제올라이트와 슬래그계 물질을 이용한 암모늄, 카드뮴, 인산염의 동시 제거능 평가
김용우(Yong-Woo Kim),우희수(Hee-Soo Woo),박희수(Hee-Soo Park),이광헌(Gwanghun Lee),오명학(Myounghak Oh),박준범(Junboum Park) 한국토목섬유학회 2011 한국지반신소재학회 학술발표회 Vol.2011 No.4
The reactive vertical drain could be applied to man-made island constructed by dredged materials and waste landfill. However, these materials could be considered as main reason of multiple contamination such as ammonium, cadmium and phosphate. Therefore, the reactive vertical drain containing various materials is necessary to remediate many kinds of contamination mentioned above simultaneously. In this study, a series of batch test which consists of two process is performed. Zeolite, basic oxygen furnace slag and blast furnace slag are used as reactive materials. Ammonium, cadmium and phosphate are targeted for removal. As a result, zeolite-basic oxygen furnace slag or blast furnace slag sequence batch test shows the best efficiency for multiple contamination removal.