• Title/Summary/Keyword: exoskeleton

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Toxicological Assessment to Environmental Stressors Using Exoskeleton Surface Roughness in Macrophthalmus japonicus: New Approach for an Integrated End-point Development (칠게 외골격 표면 거칠기를 이용한 노출 독성 평가: 새로운 융합적 연구)

  • Park, Kiyun;Kwak, Ihn-Sil
    • Korean Journal of Ecology and Environment
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    • v.54 no.4
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    • pp.265-271
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    • 2021

  • Intertidal mud crab (Macrophthalmus japonicus) is an organism with a hard chitinous exoskeleton and has function for an osmotic control in response to the salinity gradient of seawater. Crustacean exoskeletons change in their natural state in response to environmental factors, such as changes in the pH and water temperature, and the presence of pollutant substances and pathogen infection. In this study, the ecotoxicological effects of irgarol exposure and heavy metal distribution were presented by analyzing the surface roughness of the crab exoskeleton. The exoskeleton surface roughness and variation reduced in M. japonicus exposed to irgarol. In addition, it was confirmed that the surface roughness and variation were changed in the field M. japonicus crab according to the distribution of toxic heavy metals(Cd, Pb, Hg) in marine sediments. This change in the surface roughness of the exoskeleton represents a new end-point of the biological response of the crab according to external environmental stressors. This suggests that it may affect the functional aspects of exoskeleton protection, support, and transport. This approach can be utilized as a useful method for monitoring the aquatic environment as an integrated technology of mechanical engineering and biology.

  • https://doi.org/10.11614/KSL.2021.54.4.265 인용 PDF KSCI

Bending Motion Control of Electroactive Polymer Actuator-Sensor Hybrid Structure for Finger Exoskeleton (손가락 외골격용 전기활성 고분자 구동체-센서 하이브리드 구조체의 굽힘 동작 제어)

  • Han, Dong Gyun;Song, Dae Seok;Jho, Jae Young;Kim, Dong Min
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.10
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    • pp.865-871
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    • 2015

  • This study was conducted in order to develop a finger exoskeleton system using ionic polymer metal composites (IPMCs) as the actuator and sensor in a hybrid structure. To use the IPMC as an actuator producing large force, a first order transfer function was obtained using results from a block force for DC excitation that applied to two IPMCs of 20mm-width, 50mm-length, and 2.4mm thickness together. After which the validation of 200gf control with anti-windup PI controller was confirmed. A 5mm-width, 50mm-length, 0.6mm-thickness of IPMC was also modeled as a sensor for tip displacement. As a result, the IPMC sensor could been utilized as a trigger role for the actuator. Finally, an IPMC sensor and actuator were installed on the joint of a single DOF exoskeleton in the hybrid structure, and test for the control of 40gf of block force and predefined sequence of motion was performed.

  • https://doi.org/10.7736/KSPE.2015.32.10.865 인용 PDF KSCI