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김영식,임부택,김민기,김기태,장현영 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.6
External corrosion control of buried pipe can be achieved by the combination of barrier coating and cathodic protection. Coating damage and deterioration can be induced by many reasons; damage during handling and laying, enhanced failure at low temperatures, failure during commissioning and operation, disbanding due to inadequate surface cleaning, rock penetration during installation and service etc. This work focused on the effect of survey conditions on the reliability of coating flaw detection of buried pipes. The effects of applied voltage and anode location on the detection reliability of coating flaw of buried pipe in soil with the resistivity of ca. 25.8 kΩ·cm were discussed. Higher applied voltage increased the detection reliability, regardless of buried depth, but deeper burial depth reduced the reliability. The location of the anode has influenced on the detection reliability. This behaviour may be induced by the variation of current distribution by the applied voltage and buried depth. From the relationship between the applied voltage and reliability, the needed detection potential to get a desire detection reliability can be calculated to get 100% detection reliability using the derived equation.
다전극 탐상을 통한 토중 매설배관 피복결함 탐상 정확도의 개선
김민기,임부택,김기태,장현영,박흥배,김영식 한국부식방식학회 2020 Corrosion Science and Technology Vol.19 No.5
External corrosion of buried pipes can be controlled using both coating and cathodic protection. However,deterioration of the coating can occur due to several reasons. The detection reliabilty of coating flaw detectionmethods is affected by interference such as metal objects connected to rectifiers and copper grids. Whenperforming parallel direct current voltage gradient (DCVG) inspection, a sine wave form without potentialreversal in voltage gradient appears in the area where the interference exists. However, this area may benot identified using existing methods. The objective of this study was to determine the effect of analyzingdirection on the reliability of coating flaw detection of pipes buried in soil using a multi-electrode detector. DCVG on the buried pipe was measured along the buried pipe. This measurement parallel to the pipe wasrepeated. Measured data were analyzed for parallel, vertical, and diagonal directions. The reliability of coatingflaw detection was improved by up to 46.4% compared to the conventional method.
매설 배관 피복 결함 탐상 정확도에 미치는 인접 정류기 및 접지 구리망 간섭의 영향
김민기,임부택,김기태,장현영,박흥배,김영식 한국부식방식학회 2020 Corrosion Science and Technology Vol.19 No.4
The external corrosion of buried piping can be controlled using both coating and cathodic protection. Severalfactors are involved in the damage and deterioration of the coating on pipes. There are many detectionmethods for coating defects on pipes and the direct current voltage gradient (DCVG) method is one ofthe most powerful methods. However, the detection reliability of DCVG can be affected by interferencessuch as stray current, metal objects connected to rectifiers, and copper grids. Therefore, this study focusedon the interference effects of rectifiers and a copper grid on the reliability of coating flaw detection. Asthe length of the interference pipe connected to the rectifier increased, the reliability decreased. In contrast,as the distance between the pipe and the copper grid increased, the reliability of the coating flaw detectionincreased. The detection results produced by the DCVG method were discussed using current and potentialsimulations for a pipe with a rectifier and copper grid interference in the soil.
Self-Assembled Peptide-Labeled Probes for Agglutination-Based Sensing
Anura Shrestha,임부택,Priyanka Shiveshwarkar,Gumaro Rojas,Izele Abure,Anthony David Nelson,Justyn Jaworski 한국고분자학회 2021 Macromolecular Research Vol.29 No.9
The use of polydiacetylene (PDA) vesicles in sensing systems are widespread due to the interesting optical properties of this stimuli-responsive material; however, agglutination based sensing with PDA have been relatively underutilized. To demonstrate the means for rapidly generating an agglutination probe based on peptide-displaying polydiacetylene vesicles, we implement here the use of a biotin mimetic peptide functionalized to a diacetylene amphiphile for proof-of-concept detection of a multivalent target, specifically streptavidin. Tuning of the vesicle composition revealed a distinct limit in the surface density of peptide amphiphile that could be displayed for this particular peptide sequence. A wide operational detection range was demonstrated, and the result also revealed an effective agglutination response of the PDA-based probe to streptavidin suggesting possible use of future formulations in profiling other multivalent targets.
장현영,김기태,임부택,김경수,김재원,박흥배,김영식,Chang, H.Y.,Kim, K.T.,Lim, B.T.,Kim, K.S.,Kim, J.W.,Park, H.B.,Kim, Y.S. The Corrosion Science Society of Korea 2017 Corrosion Science and Technology Vol.16 No.2
Coal tar-coated pipes buried in a domestic nuclear power plant have operated under the cathodic protection. This work conducted the simulation of the coating performance of these pipes using a FEM method. The pipes, being ductile cast iron have been suffered under considerably high cathodic protection condition beyond the appropriate condition. However, cathodic potential measured at the site revealed non-protected status. Converting from 3D CAD data of the power plant to appropriate type for a FEM simulation was conducted and cathodic potential under the applied voltage and current was calculated using primary and secondary current distribution and physical conditions. FEM simulation for coal tar-coated pipe without defects revealed over-protection condition if the pipes were well-coated. However, the simulation for coal tar-coated pipes with many defects predict that the coated pipes may be severely degraded. Therefore, for high risk pipes, direct examination and repair or renewal of pipes are strongly recommended.
3D 유한요소법을 이용한 원전 매설배관 부식결함 탐상기술 개발
김재원 ( Jae-won Kim ),임부택 ( Bu-taek Lim ),박흥배 ( Heung-bae Park ),장현영 ( Hyun-young Chang ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.6
The modeling of 3D finite elements based on CAD data has been used to detect sites of corrosion defects in buried pipes. The results generated sophisticated profiles of electrolytic potential and vectors of current distributions on the earth surface. To identify the location of defects in buried pipes, the current distribution on the earth surface was projected to a plane of incidence that was identical to the pipe locations. The locations of minimum electrolytic potential value were found. The results show adequate match between the locations of real and expected defects based on modeling. In addition, the defect size can be calculated by integrating the current density curve. The results show that the defect sizes were 0.74 ㎡ and 0.69 ㎡, respectively. This technology may represent a breakthrough in the detection of indirect damage in various cases involving multiple defects in size and shape, complex/cross pipe systems, multiple anodes and stray current.
Modifying Polydiacetylene Vesicle Compositions to Reduce Non-Specific Interactions
Gumaro Rojas,Priyanka Shiveshwarkar,임부택,Anura Shrestha,Izele Abure,Anthony Nelson,Justyn Jaworski 한국고분자학회 2021 Macromolecular Research Vol.29 No.7
Polydiacetylene (PDA) vesicles provide useful stimuli-responsive behavior as well as by the modular structure afford a means for the design of sensing and delivery systems with tunable target specificity. To reduce inherent non-specific interaction with either anionic or cationic formulations of polydiacetylene vesicles, we explored the use of various lengths of poly(ethylene glycol) (PEG) amphiphiles for integration and polymerization within PDA vesicles. Our results established that as little as 1% of polyethylene glycol amphiphile integration into anionic vesicles was sufficient to significantly reduce non-specific association with mammalian cells. Similarly integrating a low percent of PEG amphiphile content within cationic vesicles could also significantly reduce non-specific cell association, and moreover reduced cytotoxicity. These results may be prove useful in augmenting PDA vesicles formulations for reduced non-specific interaction which is of particularly interest to enhancing selectivity in vesicles designed with integrated targeting moieties for sensing and drug delivery applications.
국내원전에 매설된 콜타르 코팅 배관의 음극방식과 FEM법을 이용한 방식성능 시뮬레이션
장현영 ( H. Y. Chang ),김기태 ( K. T. Kim ),임부택 ( B. T. Lim ),김경수 ( K. S. Kim ),김재원 ( J. W. Kim ),박흥배 ( H. B. Park ),김영식 ( Y. S. Kim ) 한국부식방식학회 2017 Corrosion Science and Technology Vol.16 No.3
Coal tar-coated pipes buried in a domestic nuclear power plant have operated under the cathodic protection. This work conducted the simulation of the coating performance of these pipes using a FEM method. The pipes, being ductile cast iron have been suffered under considerably high cathodic protection condition beyond the appropriate condition. However, cathodic potential measured at the site revealed non-protected status. Converting from 3D CAD data of the power plant to appropriate type for a FEM simulation was conducted and cathodic potential under the applied voltage and current was calculated using primary and secondary current distribution and physical conditions. FEM simulation for coal tar-coated pipe without defects revealed over-protection condition if the pipes were well-coated. However, the simulation for coal tar-coated pipes with many defects predict that the coated pipes may be severely degraded. Therefore, for high risk pipes, direct examination and repair or renewal of pipes are strongly recommended.