• Title/Summary/Keyword: WBC

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Preparation and Properties of Autoxidation Drying Type Waterborne Coatings Containing Bentonite (벤토나이트가 포함된 자동산화 건조형 수성코팅제의 제조 및 특성)

  • 이석기;구광모;이병교
    • Journal of the Korean Ceramic Society
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    • v.38 no.11
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    • pp.1067-1074
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    • 2001
  • Four different composition of autoxidation drying type waterborne coatings (WBC-1, WBC-2, WBC-3, WBC-4) were prepared by the compounding of bentonite (BEN) as a water swellable clay and organometallic soaps as a drier with acrylic binder and coating additives. The solution viscosity, solid content, rheological properties and drying rate of WBCs were investigated. Also the thermal stability, the transmittance and the water-resistance of the films casted by WBCs were measured, and the surface topology of WBC films were investigated by the scanning probe microscopy. As WBC-2, WBC-3 and WBC-4 containing BEN showed the thixotropy with the shear rate, the storage stability of WBC was a excellent. When the driers was mixed in the ratio of Mn/Zn/Ba=1/2/3, the dry ability of WBCs showed maximum as 5.0 sec at 60$\^{C}$. The initial decomposition temperature and the transmittance of WBC films containing BEN increased in range of 32.2∼54.7$\^{C}$ and 5.1∼8.6% than the commercial WBC (MC-21W), respectively. The water resistance of WBC films increased in order of MC-21W

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Preparation of Heat-resistance Waterborne Coating Containing Synthetic Hectorite Clay (합성헥토라이트 점토를 함유한 내열성 수성코팅제의 제조)

  • 이석기;이병교
    • Journal of the Korean Ceramic Society
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    • v.38 no.2
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    • pp.122-127
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    • 2001
  • 수열법으로 합성한 헥토라이트 점토(SHC), 아크릴 라텍스 및 코팅첨가제들을 배합하여 성분이 다른 수성코팅제(WBC-0, WBC-1, WBC-2) 3종류를 제조하였다. 제조한 수성코팅제(WBC)의 pH, 용액점도 및 고형분을 조사하였고, 전단력에 따른 유동성을 레오메타로 측정하였다. 또한 WBC로부터 주조된 필름의 열안정성과 투명성을 각각 TGA와 UV-VIS 분광광도계로 조사하였다. SHC가 8 phr 포함된 WBC-2는 전단력에 따라 졸과 겔의 상전이 현상, 즉 요변성을 나타내었으며 이로 인해 저장안정성이 우수하였다. 주조한 WBC-1과 WBC-2 필름의 초기분해온도와 투명성은 시판 WBC(OP-55W)의 필름보다 각각 99.6~110.2$^{\circ}C$와 20.9~21.7%의 범위로 증가하였다. 결과적으로, SHC가 함유된 WBC는 수팽윤성 점토에 의해 내열성과 용액점도의 증대효과가 나타났다.

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A Study on the Selection of Optimal Counting Geometry for Whole Body Counter (WBC) (인체 내부방사능 측정용 전신계측기의 최적 검출 모드 선정에 관한 연구)

  • Ko, Jong Hyun;Kim, Hee Geun;Kong, Tae Young;Lee, Goung Jin
    • Journal of Radiation Protection and Research
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    • v.39 no.1
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    • pp.1-6
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    • 2014
  • A whole body counter (WBC) is used in nuclear power plants (NPP) to identify and measure internal radioactivity of workers who is likely to ingest or inhale radionuclides. WBC has several counting geometry, i.e. the thyroid, lung, whole body and gastrointestinal tract, considered with the location where radionuclides are deposited in the body. But only whole body geometry is used to detect internal radioactivity during whole body counting at NPPs. It is overestimated internal exposure dose because this measured values are indicated as the most conservative radioactivity values among the them of others geometry. In this study, experiments to measure radioactivity depending on the counting geometry of WBC were carried out using a WBC, a phantom, and standard radiation sources in order to improve overestimated internal exposure dose. Quantitative criteria, could be selected counting geometry according to ratio of count rates of the upper and lower detectors of the WBC, are provided through statistical analysis method.

A Design Optimization on Coupling Joint between Exhaust Chimney of Electricity Generator and Electromagnetic Pulse (EMP) Shield (EMP 차폐를 위한 비상발전기 연도의 최적 형상 결정)

  • Pang, Seung-Ki;Kim, Jae-Hun
    • Journal of Energy Engineering
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    • v.24 no.4
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    • pp.159-165
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    • 2015
  • The article presents a parametric study on geometrical design optimization for coupling the joint between a large exhaust air chimney and electromagnetic pulse (EMP) shield for gas turbine electricity generator. We conducted computational fluid dynamics (CFD) simulations on hydraulic diameters of waveguide below cutoff(WBC) ranges 800mm~1025mm, the connection distance ranges 150~450mm, and exhaust gas flow velocities at 15, 20, and 25m/s. The results show that the diameter of main chimney, connection distance, and exhaust gas velocity had impacts on flow stream at the EMP shield. To provide a fully developed stream line at three different flow velocity cases, the WBC diameter and distance of connection should be larger than 1050mm and longer than 300mm, respectively.

Water Binding Capacity of Vegetable Fiber (식이섬유의 수분결합력에 관한 연구)

  • 계수경
    • The Korean Journal of Food And Nutrition
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    • v.9 no.3
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    • pp.231-235
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    • 1996
  • The water binding capacity(WC) of acid detergent fiber(ADF) was estimated. The WBC of raw vegetables ranged from 5. 1g to 24.7g water/g ADF. WBC was high in pepers and low in welsh onions. The correlation coefficients between WBC and fiber components were examined to fled which component is responsible for the deteruuning ability to bind water. The correlation coefficient between WBC and cellulose was +0.8. The binding capacity of water by fiber was affected positively by cellulose. fermentation increased in WBC of ADF. Changes of no in accordance with pH changes were evaluated at pH 2, 5.2 and 6. In all cases, WBC was high In weak acid and neutral.

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Increased Uptake of Tc-99m HMPAO WBC in Chondrosarcoma (Tc-99m HMPAO WBC 스캔에서 섭취 증가 소견을 보인 연골 육종 1례)

  • Kang, Hyun-Koo;Choi, Yun-Young;Cho, Suk-Shin
    • The Korean Journal of Nuclear Medicine
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    • v.35 no.6
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    • pp.389-392
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    • 2001
  • Tc-99m HMPAO WBC scintigraphy is a highly sensitive and specific method for detection and localization of infection and abscess formation. Nevertheless, WBC accumulation in some neoplastic lesions has been reported. We experienced a case with unusual increased uptake of Tc-99m HMPAO WBC in chondrosarcoma. Although the exact cause ms unclear, the possible mechanism is discussed.

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Systemic White Blood Cell Count as a Biomarker Associated with Severity of Chronic Obstructive Lung Disease

  • Koo, Hyeon-Kyoung;Kang, Hyung Koo;Song, Pamela;Park, Hye Kyeong;Lee, Sung-Soon;Jung, Hoon
    • Tuberculosis and Respiratory Diseases
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    • v.80 no.3
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    • pp.304-310
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    • 2017
  • Background: Chronic obstructive pulmonary disease (COPD), is a chronic inflammatory disorder. We evaluated whether white blood cell (WBC) count, is associated with the severity of COPD, independent of other inflammatory conditions, such as metabolic syndrome. Methods: The WBC counts were compared between 1227 COPD patients and 8679 non-COPD adults older than 40. The relationships between the WBC count, lung function, and symptoms score in COPD patients, were determined, using general linear regression analyses. Results: The WBC count was negatively associated with forced vital capacity (FVC, L), FVC (% predicted), forced expiry volume in one second ($FEV_1$, L), and $FEV_1$ (% predicted) in COPD patients. Additionally, the WBC count was independently associated with the quality of life measure, by EQ5D-index score. However, this relationship between WBC count, and disease severity, was not significant in current smokers, because of the confounding effect of smoking, on the WBC count. Conclusion: The WBC count is associated with current smoking status and COPD severity, and a risk factor for poor lung function, and quality of life, especially in non-currently smoking COPD patients. The WBC count can be used, as an easily measurable COPD biomarker.

Comparison of White Blood Cell Count, Erythrocyte Sedimentation Rate, and C-Reactive Protein for Diagnosis of Diabetic Foot Infection (당뇨발 감염진단을 위한 WBC, ESR, CRP의 유용성 비교)

  • Lee, Joon-Moon;Han, Seung-Kyu;Gu, Ja-Hea;Jung, Sung-Ho;Kim, Woo-Kyung
    • Archives of Plastic Surgery
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    • v.37 no.4
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    • pp.346-350
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    • 2010
  • Purpose: Diagnosis of diabetic foot infection is sometimes difficult, since the classical inflammatory signs and leukocytosis may be absent due to the decreased host immune response in diabetics. Therefore inflammatory blood markers, such as white blood cell (WBC) count, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) have been commonly needed to confirm the diagnosis of infection. The purpose of this study is to evaluate the diagnostic usefulness of WBC, ESR and CRP for detection of diabetic foot infection. Methods: Peripheral blood samples were taken from 113 patients with diabetic foot ulcers admitted from June 2007 to April 2009. Diabetic foot infection was diagnosed according to the microbiological culture from soft tissue and bone specimens. Reference values of tests were 4500-11000 /${\mu}L$ for WBC count, 0-20 mm/hr for ESR, and 0-5 mg/L for $CRP^{13,14}$. Sensitivities, specificities, positive and negative predictive values of laboratory tests were calculated and analysed. Receiver-operator characteristic (ROC) curve was also created. Results: There was a significant difference in WBC, ESR, and CRP between infectious group and noninfectious group (p<0.05). The sensitivity of WBC>11,000 /${\mu}L$ ESR > 20 mm/hr, and CRP > 5 mg/L was 30%, 96%, and 84%. The specificity was 86%, 14%, and 50% for WBC, ESR, and CRP, respectively. Positive predictive value was 88%, 78%, and 84%, and negative predictive value was 28%, 50%, and 50% respectively. The areas under the ROC curve for WBC, ESR and CRP were 0.72, 0.75, and 0.78 respectively. Conclusion: Based on the results of this study, we conclude that CRP is more useful method in predicting and diagnosing infection than WBC, ESR in diabetic foot ulcer patients.

Design Guideline of Waveguide-Below-Cutoff Array for Electromagnetic Pulse Shielding (EMP 차폐 도파관의 형상 결정 가이드라인 작성)

  • Pang, Seung-Ki;Kim, Jae-Hun;Yook, Jong-Gwan;Kim, Yuna;Kim, Sangin
    • Journal of Energy Engineering
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    • v.25 no.1
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    • pp.86-91
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    • 2016
  • Convenient design guideline for Waveguide-below-cutoff (WBC) array is proposed to obtain the minimum waveguide length for electromagnetic pulse (EMP) shielding. The analysis includes circular, rectangular, and hexagonal WBC, determine the total length of the waveguide. When the unit side of rectangular WBC and the diagonal line of hexagonal WBC are given as 30 mm, the length of hexagonal WBC is 5 mm shorter than rectangular case with shielding effectiveness (SE) 80 dB. The length difference is deepened with SE of 100 dB, which shows approximately 30 mm shorter length for hexagonal case than others. In addition, hexagonal WBC requires much shorter length than circular WBC. In conclusion, hexagonal case is the most effective with respect to flow velocity and pressure loss for equivalent SE.

Contents Protection Method usign White Box Cryptography (화이트박스 암호를 이용한 콘텐츠 보호 방법)

  • Lee, Yun-Kyung;Kim, Sin-Hyo;Mun, Hye-Ran;Chung, Byung-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.10a
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    • pp.627-628
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    • 2010
  • S. Chow proposes white-box cryptography mechanism of AES algorithm(WBC-AES) in 2002. WBC mechanism is implementation method which is resistant to white-box attack. We describe the WBC-AES and contents protection method using it.

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