• 제목/요약/키워드: Kim Su-Keun

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Optimization of Intentional Mistuning for Bladed Disk : Damping and Coupling Effect (블레이드 디스크의 intentional mistuning 최적화 : 감쇠와 커플링 효과)

  • Choi, Byeong-Keun;Lee, Hyun-Seob;Kim, Hak-Eun;Keun, Su-Jong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.538-541
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    • 2004

  • In turbomachinery rotor, there are small differences in the structural and/or geometrical properties of individual blades, which are referred to as blade mistuning. Mistuning effects of the forced response of bladed disks can be extremely large as often reported in many studies. In this paper, the pattern optimization of intentional mistuning for bladed disks considering with damping and coupling effect is the focus of the present investigation. More specifically, the class of intentionally mistuned disks considered here is limited, for cost reasons, to arrangements of two types of blades (A and B, say) and Genetic Algorithm is used to optimize the arrangement of these blades around the disk to reduce the forced response of blade with different damping and coupling stiffness.

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Characteristics of Change in Properties of Self-Adhesive Butyl Rubber Waterproofing Sheet by Increasing the Amount of Reclaimed Rubber (자착식 부틸고무 방수시트의 재생고무 증량 배합에 따른 물성변화 특성)

  • Choi, Su-Young;Park, Jin-Sang;Choi, Sung-Min;Kwon, Young-Hwa;Kim, Young-Keun;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.252-253
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    • 2021

  • In this study, butyl rubber, which is the main material constituting the self-adhesive butyl rubber waterproofing sheet, was mixed with reclaimed rubber, and tensile strength, tear strength, peeling resistance strength, and adhesion strength were measured for sample prepared by mixing ratio. As a result, it was confirmed that peeling resistance strength and adhesion strength decreased as the reclaimed rubber content increased, and tensile strength and tear strength did not change significantly.

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Development of Test Device for Response to Structural Behavior of Constrained that can Apply Zero-Span Tension Conditions (무절점 인장응력 조건의 적용이 가능한 구속형 구조물 균열 거동 대응 성능 시험 장치 개발)

  • An, Hyun-Ho;Choi, Young-Hyun;Park, Wan-Goo;Kim, Young-Keun;Oh, Sang-Keun;Choi, Su-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.214-215
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    • 2021

  • The existing evaluation method could not apply the effect of zero span tension generated in the waterproofing layer attached to the surface of the structure at the moment of cracking as the waterproofing layer was constructed in the state where the cracks were formed. The test apparatus developed through this study is expected to be able to conduct tests closer to the environment occurring in actual structures as it is possible to simultaneously create a pressurized (constrained) condition and an environment for zero span tension.

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Cavernous Hemangioma of the Cauda Equina - A Case Report - (마미총에 발생한 해면상 혈관종 - 증례보고 -)

  • Kim, Keun Su;Ahn, Byeong Jo;Han, Dong Han
    • Journal of Korean Neurosurgical Society
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    • v.30 no.5
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    • pp.662-665
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    • 2001

  • Spinal cavernous hemangiomas of the cauda equina are extremely rare vascular malformations. We report a case of intradural extramedullary cavernous hemangioma of the cauda equina with it's clinical, radiologic and surgical findings. This is the twelveth case of cavernous hemangioma of the cauda equina in the literature. The pertinent literatures are reviewed.

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