• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.77-80
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• 2004

In this paper, we have investigated the characteristics of the magnetic abrasive using sludge on polishing of internal finishing of seamless stainless steel (STS304) tube applying magnetic abrasive polishing. Either white alumina (WA) or green carborundum (GC) grain was used to resin sludge at a low temperature, and the sludge of magnetic abrasive powder was synthesized and crushed into 200 meshes. Surface roughness was measured before and after polishing, and more than 40% of improvement of surface roughness was achieved when WA grain was used under a specific condition. Even though some degree of surface roughness due to deeper scratches still exist, but the result showed a prospective magnetic abrasive polishing using sludge with WA or GC grains.

• Journal of the Speleological Society of Korea
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• no.70
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• pp.45-50
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• 2006

The magnetic polishing is the useful method to finish using magnetic power of magnet. This method is one of precision polishing techniques and has an aim of the clean technology using for the pure of gas and inside of the clean pipe for transportation. The magnetic abrasive polishing method is not so common for machine that it is not spreaded widely. There are rarely researcher in this field because of non-effectiveness of magnetic abrasive. Therefore, in this paper deals with development of the magnetic abrasive using worthless mineral. In this development, abrasive grain WA and GC used to resin bond fabricated low temperature. And magnetic material was fabricated from the worthless mineral which were closed into 200 mesh grit type. The XRD analysis result show that only WA and GC abrasive and worthless mineral crystal peaks detected which explains resin bond was not any more chemical reaction. From SEM analysis it is found that WA and GC abrasive and worthless mineral were strong bonding with each other by bond.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.10a
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• pp.507-512
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• 1999

In modern engineering practice, the grinding process is one of the most important and widely used operations for the precision finishing of components. In this paper, machining characteristics of external plunge grinding were investigated by using spindle motor current signal through hall sensor. Grinding experiments were performed in terms of various grinding conditions such as wheel speed, workpiece speed, infeed rate and spark-out time with conventional vitrified bonded WA wheel. The relationship between spindle motor current signal and metal removal rate in terms of infeed rate was induced the by analyzing spindle motor current signal.

• Food Science and Biotechnology
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• v.18 no.2
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• pp.456-462
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• 2009

In comparison to processed wheat flour products, there is no established method for determining the water absorption of rye flour. The aim of this study was to work out a method using the Planetary mixer P 600 for the determination of water absorption (WA) and the rheological properties in rye dough made from rye flours of 4 different types (I-IV). In the correlation analysis showed that WA had positive correlation with ash, beginning of gelatinization, $125-160{\mu}m$ particles, sedimentation values at 20 and 25 min, bread yield, pH, and total titratable acidity, but had negative correlation with initial viscosity, gelatinization maximum, viscosities on swelling at 25, 28, and $31^{\circ}C$. The WA determined by the Planetary mixer P 600 agreed well with the experimental baking tests.

• Transactions on Electrical and Electronic Materials
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• v.6 no.3
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• pp.128-132
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• 2005

In this paper, we have investigated the characteristics of the magnetic abrasive using sludge on polishing of internal finishing of seamless stainless steel (STS304) tube applying magnetic abrasive polishing. Either white alumina (WA) or green carborundum (GC) grain was used to resin sludge at a low temperature, and the sludge of magnetic abrasive powder was synthesized and crushed into 200 meshes. Surface roughness was measured before and after polishing, and more than $40\%$ of improvement of surface roughness was achieved when WA grain was used under a specific condition. Even though some degree of surface roughness due to deeper scratches still exist, but the result showed a prospective magnetic abrasive polishing using sludge with WA or GC grains.

• Journal of the Korean Society of Safety
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• v.18 no.2
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• pp.46-49
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• 2003

The magnetic polishing is the useful method to finish some machinery fabrications by using magnetic power. This method is one of the precision techniques and has m aim for clean technology in the transportation of the pure gas in the clean pipes. The magnetic abrasive polishing method is not so common in the field of machine that it is not known to widely. There are rarely researcher in this field because of non-effectiveness of magnetic abrasive. Therefore, in this paper we deals with the development of the magnetic abrasive with the use of Ba-Ferrite. In this development, abrasive grain WA has been made by using the min bond fabricated at low temperature. And magnetic abrasive powder was fabricated from the Ba-Ferrite which was crushed into 200 mesh. The XRD analysis result shows that only WA abrasive and Ba-Ferrite crystal peaks were detected, explaining that resin bond was not any more to contribute chemical reaction. From SEM analysis, we found that WA abrasive and Ba-Ferrite were strongly bonding with each other.

• Advances in concrete construction
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• v.6 no.6
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• pp.611-629
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• 2018

The objective of present study is to investigate the effect of granulated blast furnace slag (GBS) as partial substitution of natural sand on behaviour of cement mortar. For this, the methods of factorial design with water cement (w/c) ratio and incorporation percentages of GBS as replacement of natural fine aggregate i.e., GBS(%) as factors are followed. The levels of factor w/c ratio are fixed at 0.4, 0.45, and 0.5 and the levels of factor GBS(%) are kept fixed as 0%, 20%, 40%, 60%, 80% and 100%. The compressive strength (CS) of mortar after 3, 7, 14, 28, 56 and 90 days, and water absorption (WA) are chosen as responses of the study. Analysis of variance (ANOVA) of experimental results has been carried out and those are illustrated by ANOVA tables, main effect and interaction plots. The results of study depict that the selected factors have substantial influence on the strength and WA of mortar. However, the interaction of factors has no substantial impact on CS and WA of mixes.

• International conference on construction engineering and project management
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• 2022.06a
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• pp.1043-1050
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• 2022

Markov chains and Monte Carlo Simulation were applied to account for the probabilistic nature of pavement deterioration over time using data collected in the field. The primary purpose of this study was to evaluate pavement network performance of Western Australia (WA) by applying the existing pavement management tools relevant to WA road construction networks. Two approaches were used to analyze the pavement networks: evaluating current pavement performance data to assess WA State Road networks and predicting the future states using past and current pavement data. The Markov chains process and Monte Carlo Simulation methods were used to predicting future conditions. The results indicated that Markov chains and Monte Carlo Simulation prediction models perform well compared to pavement performance data from the last four decades. The results also revealed the impact of design, traffic demand, and climate and construction standards on urban pavement performance. This study recommends an appropriate and effective pavement engineering management system for proper pavement design and analysis, preliminary planning, future pavement maintenance and rehabilitation, service life, and sustainable pavement construction functionality.

• Journal of Sasang Constitutional Medicine
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• v.9 no.2
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• pp.163-173
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• 1997

Amp-FLP is a one of the most frequently used human genetic analysis methods which adopts STR and VNTR typings. In this study, 100 genomic DNA samples of Taeum, Soyang and Soum constitution group were analysed by Amp-FLP method. The allele distribution of three STR loci(TH01, vWA and CSF1PO) and one VNTR locus(MCT118) of each different constitution group were investigated and the allele distribution was statistically evaluated. It was found out that the allele distribution of MCT118 and THO1 loci was not significantly different among different constitutions. However, the allele distribution of vWA showed p-value of 0.02056(Soyang group) and $2.41{\times}10^{-10}$(Soum group) which is much lower than significant level of p-value 0.05. Also, p-value of CSF1PO in Soum group was found out to be $4.65{\times}10^{-17}$. Therefore, it is expected that vWA and CSF1PO loci can be used as an indicator for gnenetic difference of different constiturion if the same result is obtained with sufficient number of samples.

• Journal of Oral Medicine and Pain
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• v.24 no.2
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• pp.219-234
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• 1999

치석에는 박리상피세포, 백혈구 등이 포함되어 있어 이들의 핵 내에 있는 DNA의 유전자형을 찾아내 개인식별을 할 수 있을 것으로 추정된다. 본 연구에서는 치석만으로 개인식별이 가능한지를 알아보고자 40명으로부터 채취한 치석을 증류수에 세척한 군과 세척하지 않은 군으로 나누어 DNA를 추출하고 중합효소연쇄반응법을 이용하여 증폭절편다형(AMP-FLPs)을 실시한 후 성별검사를 위한 X-Y homologous amelogenin gene과 유전자지문검사를 위한 STR유전좌위 LPL, F13B, Triplex(F13A01, FESFPS, vWA) 등 6개의 유전자를 검색하여 - X-Y homologous amelogenin gene과 LPL, F13B는 각각 증폭하였으며 F13A01, FESFPS, vWA 세 유전자는 동시에 증폭하였음 - 다음과 같은 결과를 얻었다. 1) X-Y homologous amelogenin gene 검색으로 세척군에서 27개의 검체 중 8개, 비세척군에서 13개 중 11개에서 성별검사가 가능하였다. 2) LPL유전자는 세척군, 비세척군에서 각각 27개 검체중 2개, 13개 검체 중 5개가 검색되었으며 3개의 대립유전자(10, 11, 12)와 4개의 유전자형 (10-10, 10-11, 10-12, 11-12)이 나타났다. 3) F13B유전자는 세척군, 비세척군에서 각각 27개 검체 중 1개, 13개 검체 중 4개가 검색되었으며 2개의 대립유전자(9, 10)와 2개의 유전자형(9-10, 10-10)을 관찰하였다. 4) F13A01유전자는 비세척군에서만 13개 검체 중 3개가 검색되었고 3개의 대립유전자(3.2, 4, 6)와 3개의 유전자형(3.2-3.2, 4-5, 4-6)을 관찰하였고, 세척군에서는 나타나지 않았다. 5) FESFPS유전자는 비세척군에서만 13개 검체 중 1개가 검색되었고 유전자 형은 11-12로 나타났다. 6) vWA유전자는 세척군, 비세척군에서 각각 1개씩 검색되었으며, 3개의 대립유전자형(14, 16, 17)와 2개의 유전자형(14-16, 14-17)을 관찰하였다. 이상의 결과를 종합해 볼 때, 치석은 X-Y homologous amelogenin gene증폭을 통한 성별검사와 단일 STR유전좌위 증폭을 통한 유전자지문형 검사에는 유용하나 복합 STR유전좌위의 검색에는 부적합한 것으로 나타났으며 법의학적시료로 응용이 가능한 것으로 사료된다.