• Title, Summary, Keyword: Material screening

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Reliability of In Vitro Assay for Initial Depigmenting Agent Screening (미백제 선발을 위한 In Vitro 측정법의 신뢰도)

  • Nguyen, Dung H.;Nguyen, Duc T.M.;La, Lyun Hwa;Lee, Hyang-Bok;Shin, Jung-Hyun;Kim, Eun-Ki
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.34 no.3
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    • pp.183-188
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    • 2008
  • Initial screening assay for depigmenting agents includes in vitro mushroom tyrosinase assay and antioxidant assay. Based on this screening result, melanin synthesis in melanocyte, in screened samples, is further measured. Measuring cellular melanin needs time, human resource, and skills. Therefore initial screening method should be reliable. We examined, 34 Chinese herbs, correlated the screening assay methods with cellular melanin. No reliable relationship was observed between factors, indicating the limitation in the use of these assays, probably due to the complexicity of melanogenesis.

Phenomenon of Power Interference and Screening Factor (전력유도 현상과 차폐계수)

  • Hwang, Jong-Sun;Kim, Yeong-Min;Lee, Kyoung-Wook;Kim, Jae-Joon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.621-624
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    • 2001
  • A metal sheath provides a cable with electrostatic screening and a degree of magnetic screening. The presence of a screen on a cable also reduces the induction arising from the high-frequency components of transients caused by power-line switching and also induced transients from lightning strokes; such transient induced voltages are of increasing importance with the increasing use of miniaturized telecommunication equipment with very small thermal capacity. This paper describes electrostatic induction and electromagnetic induction caused by power interference. Also screening factors are proposed.

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Phenomenon of Power Interference and Screening Factor (전력유도 현상과 차폐계수)

  • 황종선;김영민;이경욱;김재준
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.621-624
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    • 2001
  • A metal sheath provides a cable with electrostatic screening and a degree of magnetic screening. The presence of a screen on a cable also reduces the induction arising from the high-frequency components of transients caused by power-line switching and also induced transients from lightning strokes; such transient induced voltages are of increasing importance with the increasing use of miniaturized telecommunication equipment with very small thermal capacity. This paper describes electrostatic induction and electromagnetic induction caused by power interference. Also screening factors are proposed.

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Screening and broadening effects on the mobilities for p-type Si and Ge (Screening 현상 및 broadening 현상이 p형 Si과 Ge의 이동도에 미치는 효과)

  • 전상국
    • Electrical & Electronic Materials
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    • v.10 no.6
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    • pp.581-588
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    • 1997
  • The ionization energy and degree of ionization for Si and Ge with boron doping are calculated. The hole mobilities are then calculated as a function of doping concentration using the relaxation time approximation. When the screening effect is taken into account, the reduction of ionization energy results in the increase of degree of ionization. As a result, the calculated Si mobility becomes closer to the experimental data, whereas the calculated Ge mobility is almost independent of the screening effect. The inclusion of the broadening effect in the mobility calculation overestimates the ionized impurity scattering. As compared with the experiment, the screening effect is not avoidable to calculate Si and Ge mobilities, and the broadening effect must accompany with the hopping process.

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Screening of Rayleigh Waves by Composite Barriers (복합방진벽에 의한 Rayleigh파의 차단)

  • 이종세
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.133-140
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    • 1997
  • Based on the Green's function technique, an analytical approach is developed to examine the surface wave screening effectiveness of composite wave barriers. The composite barrier consists of a high velocity layer sandwiched between two thin layers of low shear velocity materials. The high velocity layer is represented by differential matrix operators which relate the wave fields on each side of the layer. The low velocity layers are modeled by non-rigid contact conditions which allow partial sliding at the interfaces. Screening ratio of barriers with various combination of material, geometric, and non-rigidness parameters are compared and discussed in some detail.

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A Systematic Review of Child Abuse Screening Instruments (아동학대 평가도구의 체계적 고찰)

  • Kim, Hyun-Kyoung;Choi, Hye-mi;Park, Hyun-Jung
    • Child Health Nursing Research
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    • v.22 no.4
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    • pp.265-278
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    • 2016
  • Purpose: The aim of this study was to conduct a systematic review and to describe the characteristics of child abuse screening instruments. Methods: Articles regarding the development of a child abuse screening instrument were investigated using the systematic review method. A literature search using the keywords "child and abuse or maltreatment and instrument or screening tool" in English, and "child," "abuse," and "instrument" in Korean, was conducted of material published in PubMed, PsycINFO, CINAHL, SCOPUS, ERIC, and RISS. Database and bibliographic searches, and quality appraisal using the Quality Assessment of Diagnostic Accuracy Studies tool that included systemic reviews, yielded 17 records. Results: Key elementary child abuse screening instruments were developed for physical, psychiatric, affective and sexual and child neglect assessment. The instruments' target populations were children at home and in institutions. The reviewed instruments had the advantage of diagnosing past, concurrent, and indirectly, potential child abuse. Conclusion: The results of this study demonstrate that child abuse screening instruments are available for screening and for assessment of abused children in various circumstances. This review of child abuse screening instruments offers evidence for the acceptable use of optimal psychometric tools for child abuse assessment and provides guidelines for child health nursing practice.

Readability, Suitability and Health Content Assessment of Cancer Screening Announcements in Municipal Newspapers in Japan

  • Okuhara, Tsuyoshi;Ishikawa, Hirono;Okada, Hiroko;Kiuchi, Takahiro
    • Asian Pacific Journal of Cancer Prevention
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    • v.16 no.15
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    • pp.6719-6727
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    • 2015
  • Background: The objective of this study was to assess the readability, suitability, and health content of cancer screening information in municipal newspapers in Japan. Materials and Methods: Suitability Assessment of Materials (SAM) and the framework of Health Belief Model (HBM) were used for assessment of municipal newspapers that were published in central Tokyo (23 wards) from January to December 2013. Results: The mean domain SAM scores of content, literacy demand, and layout/typography were considered superior. The SAM scores of interaction with readers, an indication of the models of desirable actions, and elaboration to enhance readers' self-efficacy were low. According to the HBM coding, messages of medical/clinical severity, of social severity, of social benefits, and of barriers of fear were scarce. Conclusions: The articles were generally well written and suitable. However, learning stimulation/motivation was scarce and the HBM constructs were not fully addressed. Practice implications: Articles can be improved to motivate readers to obtain cancer screening by increasing interaction with readers, introducing models of desirable actions and devices to raise readers' self-efficacy, and providing statements of perceived barriers of fear for pain and time constraints, perceived severity, and social benefits and losses.

Sol-gel Material Optimization for Aptamer Biosensors

  • Ahn, Ji-Young;Cho, Min-Jung;Lee, Se-Ram;Park, Jun-Tae;Hong, Seok-Jin;Shin, Sung-Ho;Jeong, Min-Ku;Lee, Dong-Ki;Kim, So-Youn
    • Molecular & Cellular Toxicology
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    • v.4 no.2
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    • pp.100-105
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    • 2008
  • Biochips are a powerful emerging technology for biomedical, environmental applications. Especially, making use of bioseonors in the evaluation of toxicity becomes increasingly important. For biosensor as a toxicity detection, biomolecules like antibodies or aptamers have been developed to specifically capture the toxic target molecules. In addition, the development of optimal chip materials capable of maintaining the activity of embedded biomolecules such as proteins or aptamers has proven challenging. Here, using sol-gel materials, new chip material, whose ability for immobilizing the embedded aptamers and maintaining the ability of embedded aptamers is optimal, was searched. We used sol-gel formulation screening methods previously developed and found the best formulation which shows high sensitive and specific interactions of aptamers. This study results will support the technological advancement for diagnosis and environmental sensor.

An innovative vibration barrier by intermittent geofoam - A numerical study

  • Majumder, Mainak;Ghosh, Priyanka;Sathiyamoorthy, Rajesh
    • Geomechanics and Engineering
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    • v.13 no.2
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    • pp.269-284
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    • 2017
  • A new technique is proposed to obtain more effective screening efficiency against the ground vibration using intermittent geofoam (IF) in-filled trench. The numerical analysis is performed by employing two-dimensional finite element method under dynamic condition. Vertically oscillated strip foundation is considered as the vibration source. In presence of the ground vibration, the vertical displacements at different locations (pick-up points) along the ground surface are captured to determine the amplitude reduction factor (ARF), which helps to assess the efficiency of the vibration screening technique. The efficiency of IF over continuous geofoam (CF) in-filled vibration barriers is assessed by varying the geofoam density, the location of trench and the frequency of excitation. The results from this study indicate that a significant reduction in ARF can be achieved by using intermittent geofoam as compared to continuous geofoam. Further, it is noticed that the efficiency of IF increases with an increase in the frequency of the vibrating source. These encouraging results put forward the potential of utilising intermittent geofoam as a vibration screening material.