• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.3
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• pp.585-590
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• 2012

In this paper, a system using vibrating wire sensor and zigbee wireless network has been implemented to monitor and manage the structure. The implemented strain controller drives vibrating wire sensor and computes strain from measuring frequency of the output signal. Temperature sensor is included to compensate strain by temperature. Using two axis acceleration sensor of strain controller can measure the direction of strain or deformation. To measure strain more effectively, wired and wireless communication function is included in this device. As results of experiments, it is shown that the developed system can be effectively applied to measure strain of the structure.

• Journal of the Korean GEO-environmental Society
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• v.8 no.1
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• pp.5-11
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• 2007

Internal stress variation in the face slab concrete induced by reservoir water pressure may affect on the stability of the dam so that the reclamation type of strain gauge is applied for measuring internal stress variation. In this study, internal as well as external stress variation of dam was measured by using strain gauge that was reclaimed to the ${\circ}{\circ}$ dam. In the result, it was confirmed that other measurements by relevant gauges need to be supplemented as the use of strain gauge only is insufficient to evaluate the stability analysis and global behavior of the dam.

• Economic and Environmental Geology
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• v.25 no.2
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• pp.179-190
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• 1992

The Yeongchun area is located at the central part of the Danyang Coalfield, where Precambrian granitoids, Cambro-Ordovician Choseon Supergroup, Carboniferous-early Triassic Pyeongan Supergroup, middle Triassic-Jurassic Bansong Group and extrusive tuffs are exposed. The rocks in the area underwent four phases of deformation, which are (a) $D_1$ : Movement of the Okdong Fault, (b) $D_2$ : Formation of NW-SE trending folds and stretching lineations, (c) $D_3$: Movement of the Gagdong Thrust Fault and associated structures of NNE-SSW trending folds, and (d) $D_4$ : E-W trending strike-slip faults and folds. During the $D_3$-event, flexural slip deformation intensively affected rocks in the area. Strain measurements show relatively low strain intensity in the area. The types of strain ellipsoid are prolate in the hangingwall area and those near to the footwall area range from plane strain to weak oblate. The oblate type is developed in the region far from the footwall area.

• Proceedings of the Korean Geotechical Society Conference
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• 1998.10a
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• pp.145-150
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• 1998

• Microbiology and Biotechnology Letters
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• v.24 no.3
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• pp.311-315
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• 1996

A cytotoxic material was produced by strain No. 5-99 which was isolated from soil. Analyzing the cell wall components, LL-diaminopimelic acid was identified. From the existance of glycine in the cell wall, this strain was identified to Streptomyces sp. which has cell wall chemotype I and peptidoglycan type A3 connected by glycine. So, we named this strain to Streptomyces sp. YJB-599. The Active material was purified through solvent extraction, silica gel column chromatography and crystallized to needle-shaped white -crystal. Analyzing the structure of this crytal by instrumental analysis and database, it was determined to genistein.

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.710-712
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• 2003

A new species of Gram-negative halophilic cartenoid producing bacterium was isolated from the Haeundae Coast, Korea. This strain is non-motile, aerobic, orange-pigmented, rod-shaped, and produced carotenoids, mainly astaxanthin. All the type strains of the genus Paracoccus were compared with this strain using 16S rDNA sequence analysis, fatty acid patterns, and physiological reaction profiles. From the results obtained, this strain is classified as a new species, Paracoccus sp..

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 2004.06a
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• pp.257-257
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• 2004

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.123-124
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• 2007

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.452-459
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• 2003

In previous study, we have isolated Lactobacillus spp. from healthy human vagina and examined various characteristics such as antimicrobial substance production and exopolysaccharide (EPS) production. It is known that an EPS is an important factor of Lactobacillus spp. to adhere to epithelial cell. We have selected L. paracasei KLB58 having high antimicrobial activity and EPS production. In this study, we performed NTG (1-Methyl-3-nitro-1-nitrosoguanidine) mutagenesis to isolate an EPS deficienct mutant of KLB58 showing high cell surface hydrophobicity (CSll) compared to wild type strain. By monitoring the kinetics of the partition with hexadecane the EPS mutant was found to be far more hydrophobic than the wild type strain ; the CSH of the EPS mutant was 0.5-fold higher than the wild type strain.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07b
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• pp.888-891
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• 2003

This paper describes on the fabrication and characteristics of micro ceramic thin-film type pressure sensors based on Ta-N strain-gauges for high-temperature applications. The Ta-N thin-film strain-gauges are deposited onto thermally oxidized Si diaphragms by RF sputtering in an argon-nitrogen atmosphere($N_2$ gas ratio: 8 %, annealing condition: $900^{\circ}C$, 1 hr.), Patterned on a wheatstone bridge configuration, and use as pressure sensing elements with a high stability and a high gauge factor. The sensitivity is $1.097{\sim}1.21mV/V.kgf/cm^2$ in the temperature range of $25{\sim}200^{\circ}C$ and the maximum non-linearity is 0.43 %FS. The fabricated pressure sensor presents a lower TCR, non-linearity than existing Si piezoresistive pressure sensors. The fabricated micro ceramic thin-film type pressure sensor is expected to be usefully applied as pressure and load sensors that is operable under high-temperature environments.