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하동진,유홍희 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.6
Vibration localization characteristics of mistuned repeated structures are investigated. The mistuning often creates significant response discrepancies among subcomponents of a repeated structure. As the result of the discrepancies, critical fatigue often occurs in a repeated structure. Therefore, it is of great importance to predict the vibration response of the mistuned repeated structures accurately. In this paper, a simplified model is employed and dimensionless parameters that influence the localization characteristics are identified. Through parameter study, two localization phenomena are investigated and compared.
하동진(Dongjin Ha),지현철(Hyunchul-Ji),유재근(Jaegun-Yu),윤광수(Kwangsoo Yoon),이태봉(Taebong Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper presents complex eigenvalue analysis of commercial vehicle air disc brake system. To increase a reliability of a brake finite element model, the mode shapes and natural frequencies of the individual brake components are obtained by comparing form modal analysis and modal test. (The modal analysis and test shows that difference of the natural frequency is very small.) As a result of squeal analysis identified unstable modes of air disc brake system, a similar dynamo noise test. Additional, confirmed the final improvement model through parameter study that decrease the brake squeal.
하동진(Ha, Dong-Jin),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.12
Vibration localization characteristics of open loop repeated mistuned structures are investigated. The mistuning often creates significant response discrepancies among subcomponents of the repeated structures. As a result of the discrepancies, critical fatigue problems often occur in repeated structures. Therefore. it is of great importance to predict the vibration response of the mistuned repeated structures accurately in this Paper, a simplified model for an open-loop repeated structure is introduced and dimensionless parameters that influence the localization characteristics are identified. The effects of the parameters on the localization characteristics are investigated through numerical study.
하동진(Dong Jin Ha),신상하(Sang Ha Shin),유홍희(Hong Hee Yoo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Dynamic modeling of an eccentric MEMS gyroscope is presented and the dynamic characteristics of the gyroscope are investigated with the modeling method. It is found that the eccentricity of the MEMS gyroscope affects the dynamic characteristics significantly. Different from conventional MEMS gyroscopes, the zero-rate output is significantly reduced in this gyroscope. To obtain general guidelines of the gyroscope design, dimensionless parameters are first identified and the effects of the parameters on the gyroscope performance measures are investigated.
HSP27 MODULATION OF IMPLANT- ASSOCIATED METAL ION CYTOTOXICITY OF OSTEOBLASTIC CELLS
윤정호,하동진,임재석,권종진,장현석,이의석,김대성,Yoon, Jung-Ho,Ha, Dong-Jin,Rim, Jae-Suk,Kwon, Jong-Jin,Jang, Hyon-Seok,Lee, Eui-Seok,Kim, Dae-Sung Korean Association of Maxillofacial Plastic and Re 2006 Maxillofacial Plastic Reconstructive Surgery Vol.28 No.2
Objectives: The extent of bone formation that occurs at the interface of metallic implants and bone is determined by the number and activity of osteoblastic cells. Stress proteins may be contributing determinants of cell viability in altered environments. Hsp27 is a small Mr hsp which is known as a molecular chaperone. Methods: To better understand how heat shock protein 27 contributes to endosseous implant - associated metal ions affects on osteoblastic cell viability, the effect of chromium and titanium ions were compared to effects of cadmium ions in the ROS17/2.8 osteoblastic cell line. Results: ROS17/2.8 osteoblastic cell line demonstrated ion - specific reductions in growth; reductions were significantly greater for cadmium than for chromium or titanium. Chromium impaired growth of cultures without altering cell viability measured using the MTT assay. A stable transformed cell line expressing additional hsp27(clone "A7") was resistant to the toxic effects of titanium and partially protected from cadmium toxicity. Conclusions: A role for hsp27 in protection of osteoblastic cells from metal ion toxicity is supported by the chromium - induced elevations in hsp27 abundance and the behavior of the A7 cell line in response to metal ions in culture. Similar biochemical responses to altered cellular environments may contribute to the fate of tissues adjacent to select metallic implants.