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김성목(Seong-Mok Kim),정예은(Ye-Eun Jeong),김예준(Ye-Jun Kim),김용수(Yong Soo Kim) 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.1
Purpose: Tire maintenance is essential for safety, as tire failure can cause significant damage to human health and infrastructure during light rail operations. Therefore, we developed a diagnostic algorithm for light rail rubber tires to prevent such catastrophic events. Methods: Vibration signals measured by tri-axis accelerometers were acquired during real-world light rail operation, and we compared vibrations among various tire states, established a health index, and developed a model for determining tire state. Results: The most important type of vibration in terms of tire state was x-axis vibration. Our model determined tire states by calculating x-axis vibration differences in various tire conditions. Furthermore, high model accuracy was confirmed by stratified k-fold cross-validation. Conclusion: Our diagnostic algorithm for determining tire condition reduces operating and support costs and promotes reliability and safety by enabling timely and appropriate maintenance that considers the age of individual tires. Thus, it could replace existing time-based maintenance protocols.
Staphylococcus aureus FtsZ의 클로닝, 발현 및 폴리머 형성 활성 분석
손상현 ( Sang Hyeon Son ),이동윤 ( Dong Yun Lee ),김예준 ( Ye Jun Kim ),고수호 ( Soo Ho Ko ),조성준 ( Seong Jun Cho ),정효철 ( Hyo Cheol Jung ),이형호 ( Hyung Ho Lee ) 한국미생물생명공학회(구 한국산업미생물학회) 2012 한국미생물·생명공학회지 Vol.40 No.3
Cytokinesis is the final stage of cell division, dividing one mother cell into two daughter cells. For the cutting of a plasma membrane during bacterial cytokinesis, a tubulin homolog FtsZ protein is recruited from the cytoplasm to the division site. FtsZ protein polymerizes in aGTP-dependent manner and its N-terminal domain has a GTPase activity. In this study, we have begun to characterize FtsZ from Staphylococcus aureus (SA). Full-length SA FtsZ was cloned into pRSFDuet-1 vector and the clone was transformed into a BL21 (DE3) star cell. The recombinant SA FtsZ protein was purified using Ni-NTA affinity chromatography and dialysis. Using a spectrofluorometer, we showed that SA FtsZ undergoes aGTP-dependant polymerization in vitro. The polymer of the SA FtsZ protein disappeared after a few minutes, suggesting that the polymer is degraded as the GTP is consumed. This assay system may well be applied for inhibitor screening targeting S. aureus FtsZ.