• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2009.04a
• /
• pp.326-331
• /
• 2009

An algorithm is proposed for computing dynamic displacements of a bridge using FBG sensors. An existing algorithm for estimating dynamic displacements of a simply supported beam through mode superposition is extended and applied to various types of bridges with bending and torsional modes. The proposed algorithm is examined through field tests on a suspension span steel deck plate box girder bridge. Guidelines are provided for determining the number of modes and the number of strain gages to be used.

• Asia pacific journal of information systems
• /
• v.5 no.2
• /
• pp.101-129
• /
• 1995

This paper proposes a form-based distributed database design methodology ($FD^3$). The methodology consists of five design phases such as (i) form requirement analysis (ii) schema integration (iii) distribution analysis (iv) distribution design, and (v) local logical/physical design. In the $FD^3$, all the important design information for each phase is obtained by using an organizations forms, Users requirements are analyzed by using forms that contain logical and quantitative information for distribution design. $FD^3$ resolves naming conflicts by employing SQLs based on the form field data in the schema integration phase. Furthermore, $FD^3$ enhances the quality of distributed database design by incorporating communication costs into the design model. A real-life case is illustrated to demonstrate the usefulness of the $FD^3$.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.27 no.12
• /
• pp.2011-2018
• /
• 2003

To analyze the bending collapse behavior of an aluminum square tube beam under a bending load, a finite element simulation for the four-point bending test has been performed. Using an aluminum tube beam specimen partly inserted with two steel bars, the local buckling deformation near the center of the tube beam was induced. The maximum bending load and the bending collapse behavior obtained from the numerical simulation were in good agreement with experimental results. Using a combination of the four-point bending test and its finite element simulation, analysis of the local buckling and the accompanied bending collapse behavior of aluminum tube beam could be quantitative accomplished.

• Journal of Mechanical Science and Technology
• /
• v.17 no.2
• /
• pp.215-220
• /
• 2003

Trepan prevents the wear of the inside part of a bearing when the initial shaft rotates. It continuously contacts with the eccentric part of the shaft in rotation and is loaded repeatedly. Therefore, even if an early crack of a trepan part is small, the crack may progress by the repeated load. If the crack progresses, very small chips come out. This Is put in the rotor and prevents the rotation of the compressor, There can be leaks in a microgroove and extreme wear can occur due to lack of oil on the surface contact part. Therefore, this study was carried out to compare and investigate the trepan strength and deflection characteristics between trepan locations and dimension changes using the finite element method and search a motor bearing for a model with bigger stiffness of a trepan part and the same deflection.

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.81-81
• /
• 2006

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.99-99
• /
• 2006

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.69-69
• /
• 2006

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.72-72
• /
• 2006

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.91-91
• /
• 2006

• Korean Journal of Pharmacognosy
• /
• v.37 no.3
• /
• pp.162-168
• /
• 2006

The isolation and identification of a new xanthone (6-0-palmitolyl-1,6-dihydroxy-5,7-dimethoxyxanthone) along with n-alkanols, fatty acids, 1,6-dihydroxy-5,7-dimethoxyxanthone, 1,7-dihydroxykanthone, betulinic acid, ${\beta}-sitosterol$, methyl 4-hydroxybenzoate, quercetin, and kaempferol from the aerial parts of Hypericum ascyron was reported. The structures were elucidated by spectroscopic methods, mainly NMR and mass spectrometry.