• Title/Summary/Keyword: lateral flow

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A study on the stability of pile bridge abutment on soft ground undergoing lateral flow (연약지반에서의 말뚝기초 교대의 측방유동 대책공법 적용에 관한 연구)

  • 오일록;채영수
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.753-760
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    • 2003
  • An existing studies concern about movement of pile bridge abutments. However, lateral displacement cause the serious failure of bridge by embankment under soft soil lateral flow A intention is obtained by analyzing the relationship between the safety factor of evaluation for lateral movements. Precise investigation and analysis are performed, in which the lateral movement of bridge abutments has occurred, and construct design strut-slab between bridge abutments in order to restraint lateral flow. As a result of this study, it was found that when evaluation for lateral movements is allowed to use Tschebotarioff's method and lateral flow decision number (I) and revision lateral flow decision number (M$_{I}$) by Korea Highway Corporation. Most important thing is decision of pressure of lateral flow at this case. Tschebotarioff's isoscales triangle method have no trouble analysis of pressure of lateral flow. Strut-slab method are nearly not have constructed case in this field site study that applied method. The method are between abutments combined steel strut and reinforced concrete slab. This method are effective restraint lateral flow but have little difficulty if long span bridge between abutments.s.

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A Review on Lateral Flow Test Strip for Food Safety

  • Kim, Giyoung;Lim, Jongguk;Mo, Changyeun
    • Journal of Biosystems Engineering
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    • v.40 no.3
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    • pp.277-283
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    • 2015
  • Background: Foodborne disease outbreaks from various food sources are a major health concern worldwide. Current methods for detection of foodborne pathogens are both expensive and time-consuming. Purpose: This review aims to present the current information available on the use of lateral flow test strips to detect pathogens in food products to enhance food safety. Results: Frequent foodborne disease outbreaks from various food sources have increased the need for rapid and easy methods for routine analysis of foodborne pathogens. Present detection methods for foodborne pathogens require expensive instruments, experts, and long time for sample analysis. Lateral flow test strips have drawn attention in recent years because of their ability to detect analytes quickly and easily. This review focuses on the principle of the lateral flow test, the various formats of lateral flow test strips, recognition elements, labeling tags, and reading instruments. In addition, this review also discusses the future prospects for the lateral flow test strips.

A Relative Study on Safe Factor by Different Analyses of Slope Stability (EPS공법에 의한 측방유동 저감효과에 관한 해석적 연구)

  • An, Joon-Hee;Jang, Jeong-Wook;Park, Choon-Sik
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.1181-1186
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    • 2006
  • This study analyzed the reductive effect of lateral flow by the section and height of reinforcement of EPS. The conclusions of the study are as follows. (1) The lateral flow increased as the section of reinforcement decreased. The reinforcement section that satisfied the allowable range of the lateral flow turned out to beapproximately 80% of the standard reinforcement section. (2) As reinforcement height was decreasing, the lateral flow increased. The reinforcement heigh that satisfied the allowable range of the lateral flow turned out to be approximately 50% of the total lateral height of abutment.

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Image Analysis of a Lateral Flow Strip Sensor for the Detection of Escherichia coli O157:H7

  • Kim, Giyoung;Moon, Ji-Hea;Park, Saet Byeol;Jang, Youn-Jung;Lim, Jongguk;Mo, Changyeun
    • Journal of Biosystems Engineering
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    • v.38 no.4
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    • pp.335-340
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    • 2013
  • Purpose: This study was performed to develop a lateral flow strip sensor for the detection of pathogenic Escherichia coli O157:H7 in various samples. Also, feasibility of using an image analysis method to improve the interpretation of the strip sensor was evaluated. Methods: The lateral flow strip sensor has been fabricated based on nitrocellulose lateral-flow membrane. Colloidal gold and E. coli O157:H7 antibodies were used as a tag and a receptor, respectively. Manually spotted E. coli O157:H7 antibody and anti-mouse antibody on nitrocellulose membrane were used as test and control dots, respectively. Feasibility of the lateral flow strip sensor to detect E. coli O157:H7 were evaluated with serially diluted E. coli O157:H7 cells in PBS or food samples. Test results of the lateral flow strip sensor were measured with an image analysis method. Results: The intensity of the test dot started to increase with higher concentration of the cells were introduced. The sensitivities of the sensor were both $10^4$ CFU/mL Escherichia coli O157:H7 spiked in PBS and in chicken meat extract, respectively. Conclusions: The lateral flow strip sensor and image analysis method could detect E. coli O157:H7 in 20 min, which is significantly quicker than conventional plate counting method.

Development of Artificial Lateral Line Sensor for Flow Velocity and Angle Measurements (유속 및 각도 측정을 위한 인공 옆줄 센서 개발)

  • Kim, Jinhyun
    • Journal of Sensor Science and Technology
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    • v.30 no.1
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    • pp.30-35
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    • 2021
  • To operate an underwater robot in an environment with fluid flow, it is necessary to recognize the speed and direction of the fluid and implement motion control based on these characteristics. Fish have a lateral line that performs this function. In this study, to develop an artificial lateral line sensor that mimics a fish, we developed a method to measure the flow speed and the incident angle of the fluid using a pressure sensor. Several experiments were conducted, and based on the results, the tendency according to the change in the flow speed and the incident angle of the fluid was confirmed. It is believed that additional research can aid in the development of an artificial lateral line sensor.

The Measurement of Lateral Displacement of Abutment Using a Inclinometer (경사계를 이용한 교대변위 계측에 관한 연구)

    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.04a
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    • pp.82-90
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    • 2000
  • The abutment of bridge on soft foundation makes lateral movement due to the settlement of back fill and lateral flow. To measure the displacement of such a abutment, there are a lot of indirect method for measurement such as survey of leveling or inclinometer gauge around the abutment. But all of them are not sufficient to confirm the ground behavior and measure the exact lateral behavior of structure. As making the structure and pile cooperatively by measuring the movement of lateral displacement, for measuring the abutment displacement precisely by using the incliinometer. In this work, we try to suggest efficient measuring method of abutment displacement and its application.

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A Method for Quantitative Measurement of Lateral Flow Immunoassay Using Color Camera (컬러 카메라를 이용한 측면유동 면역 어세이 정량분석 방법)

  • Park, Jongwon
    • Journal of Biomedical Engineering Research
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    • v.35 no.1
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    • pp.1-7
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    • 2014
  • Among semi-quantitative or fully quantitative lateral flow assay readers, an image sensor-based instrument has been widely used because of its simple setup, cheap sensor price, and compact equipment size. For all previous approaches, monochrome CCD or CMOS cameras were used for lateral flow assay imaging in which the overall intensities of all colors were taken into consideration to estimate the analyte content, although the analyte related color information is only limited to a narrow wavelength range. In the present work, we introduced a color CCD camera as a sensor and a color decomposition method to improve the sensitivity of the quantitative biosensor system which utilizes the lateral flow assay successfully. The proposed setup and image processing method were applied to achieve the quantification of imitatively dispensed particles on the surface of a porous membrane first, and the measurement result was then compared with that using a monochrome CCD. The compensation method was proposed in different illumination conditions. Eventually, the color decomposition method was introduced to the commercially available lateral flow immunochromatographic assay for the diagnosis of myocardial infarction. The measurement sensitivity utilizing the color image sensor is significantly improved since the slopes of the linear curve fit are enhanced from 0.0026 to 0.0040 and from 0.0802 to 0.1141 for myoglobin and creatine kinase (CK)-MB detection, respectively.

Development of Human Papillomavirus DNA Array by Using Lateral Flow Membrane Assay (Lateral Flow Membrane를 이용한 인유두종 바이러스 DNA Array의 개발)

  • Kim, Ki-Whang;Lee, Hyung-Ku;Cho, Hong-Bum
    • Korean Journal of Microbiology
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    • v.44 no.4
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    • pp.346-351
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    • 2008
  • This study develops DNA array which can detect specific sequence of human papilomavirus (HPV) by using lateral flow membrane assay which is usually used for point of care test including pregnant diagnosis. Principle of HPV DNA array is as follow; fixing DNA probe which is peculiar to HPV type 6, 11, 16, 18, 31, 45 on a surface of lateral flow membrane and inducing hybridization response between probe and HPV PCR products which is obtained by using biotin-labeled MY09/l1 primers. And then, we can see the result of DNA hybridization that streptavidin labelled colloidal gold is responded with hybrid biotin. Lateral flow membrane array developed in this study confirms major HPV type economically and conveniently compared with existing HPV DNA chip method.

Reliability Analysis on the Decision Method of Lateral Flow of Foundation Piles for Abutment (교대 기초말뚝의 측방유동 판정식에 관한 신뢰성 해석)

  • Ahn, Jong-Pil;Kim, Gyu-Deok;Kim, Il-Goo;Choi, Jin-Ho
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.1090-1097
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    • 2008
  • This study conducted the decision method of lateral flow in abutment structures founded on the soft soils and the reliability analysis on the foundation pile for abutment. On the basis of the results, this study proposed the reliability design model. Reliability analysis was conducted by applying second moment method, point estimation method, and expected total cost minimization to lateral movement index, lateral movement decision index, modified lateral movement decision index, and circular failure safety factor for the decision criteria of lateral flow. The reliability index by analysis method had a similar tendency each other. Point estimation method was found as a practical method in the aspect of convenience because it could conduct the analysis only by mean and standard deviation as well as the partial derivative on random variables was not necessary. Optimum reliability index and optimum safety according to increasing in failure factors and load ratio were analyzed and loads and resistance factors of the design criteria of optimum reliability were estimated. It presented rational design model which can consider construction level and stability and economical efficiency overall.

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The Measurement Method of Lateral Displacement in Bridge Abutment. (교량구조물의 측방이동 측정방법에 관한 연구)

  • 장용채
    • Journal of Korean Port Research
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    • v.14 no.1
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    • pp.115-124
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    • 2000
  • This study is a suggest a measurement method of lateral displacement, which can be used to judge the stability of bridge abutment on soil undergoing lateral movement. The abutment of bridge on soft foundation makes lateral movement due to the settlement of back fill and lateral flow. To measure the displacement of such a abutment, there are a lot of indirect method for measurement such as survey of leveling or inclinometer gauge around the abutment. But all of them are not sufficient to confirm the ground behavior and measure the exact lateral behavior of structure. As making the structure and pile cooperatively by measuring the movement of lateral displacement, for measuring the abutment displacement precisely by using the inclinometer. In this work, we try to suggest efficient measuring method of abutment displacement and its application.

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