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  1. Article ; Online: Design of a Sensitive Balloon Sensor for Safe Human-Robot Interaction.

    Kim, Dongjin / Han, Seungyong / Kim, Taewi / Kim, Changhwan / Lee, Doohoe / Kang, Daeshik / Koh, Je-Sung

    Sensors (Basel, Switzerland)

    2021  Volume 21, Issue 6

    Abstract: As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human-robot interaction (HRI). Existing lightweight and thin tactile sensors ... ...

    Abstract As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human-robot interaction (HRI). Existing lightweight and thin tactile sensors exhibit high performance in detecting their surroundings. However, unexpected collisions caused by malfunctions or sudden external collisions can still cause injuries to rigid robots with thin tactile sensors. In this study, we present a sensitive balloon sensor for contact sensing and alleviating physical collisions over a large area of rigid robots. The balloon sensor is a pressure sensor composed of an inflatable body of low-density polyethylene (LDPE), and a highly sensitive and flexible strain sensor laminated onto it. The mechanical crack-based strain sensor with high sensitivity enables the detection of extremely small changes in the strain of the balloon. Adjusting the geometric parameters of the balloon allows for a large and easily customizable sensing area. The weight of the balloon sensor was approximately 2 g. The sensor is employed with a servo motor and detects a finger or a sheet of rolled paper gently touching it, without being damaged.
    MeSH term(s) Aircraft ; Fingers ; Humans ; Robotics ; Touch
    Language English
    Publishing date 2021-03-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s21062163
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Real-time counting of wheezing events from lung sounds using deep learning algorithms: Implications for disease prediction and early intervention.

    Im, Sunghoon / Kim, Taewi / Min, Choongki / Kang, Sanghun / Roh, Yeonwook / Kim, Changhwan / Kim, Minho / Kim, Seung Hyun / Shim, KyungMin / Koh, Je-Sung / Han, Seungyong / Lee, JaeWang / Kim, Dohyeong / Kang, Daeshik / Seo, SungChul

    PloS one

    2023  Volume 18, Issue 11, Page(s) e0294447

    Abstract: This pioneering study aims to revolutionize self-symptom management and telemedicine-based remote monitoring through the development of a real-time wheeze counting algorithm. Leveraging a novel approach that includes the detailed labeling of one ... ...

    Abstract This pioneering study aims to revolutionize self-symptom management and telemedicine-based remote monitoring through the development of a real-time wheeze counting algorithm. Leveraging a novel approach that includes the detailed labeling of one breathing cycle into three types: break, normal, and wheeze, this study not only identifies abnormal sounds within each breath but also captures comprehensive data on their location, duration, and relationships within entire respiratory cycles, including atypical patterns. This innovative strategy is based on a combination of a one-dimensional convolutional neural network (1D-CNN) and a long short-term memory (LSTM) network model, enabling real-time analysis of respiratory sounds. Notably, it stands out for its capacity to handle continuous data, distinguishing it from conventional lung sound classification algorithms. The study utilizes a substantial dataset consisting of 535 respiration cycles from diverse sources, including the Child Sim Lung Sound Simulator, the EMTprep Open-Source Database, Clinical Patient Records, and the ICBHI 2017 Challenge Database. Achieving a classification accuracy of 90%, the exceptional result metrics encompass the identification of each breath cycle and simultaneous detection of the abnormal sound, enabling the real-time wheeze counting of all respirations. This innovative wheeze counter holds the promise of revolutionizing research on predicting lung diseases based on long-term breathing patterns and offers applicability in clinical and non-clinical settings for on-the-go detection and remote intervention of exacerbated respiratory symptoms.
    MeSH term(s) Child ; Humans ; Respiratory Sounds/diagnosis ; Deep Learning ; Algorithms ; Lung Diseases/diagnosis ; Neural Networks, Computer
    Language English
    Publishing date 2023-11-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0294447
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Effect of Metal Thickness on the Sensitivity of Crack-Based Sensors.

    Lee, Eunhan / Kim, Taewi / Suh, Heeseong / Kim, Minho / Pikhitsa, Peter V / Han, Seungyong / Koh, Je-Sung / Kang, Daeshik

    Sensors (Basel, Switzerland)

    2018  Volume 18, Issue 9

    Abstract: Among many attempts to make a decent human motion detector in various engineering fields, a mechanical crack-based sensor that deliberately generates and uses nano-scale cracks on a metal deposited thin film is gaining attention for its high sensitivity. ...

    Abstract Among many attempts to make a decent human motion detector in various engineering fields, a mechanical crack-based sensor that deliberately generates and uses nano-scale cracks on a metal deposited thin film is gaining attention for its high sensitivity. While the metal layer of the sensor must be responsible for its high performance, its effects have not received much academic interest. In this paper, we studied the relationship between the thickness of the metal layer and the characteristics of the sensor by depositing a few nanometers of chromium (Cr) and gold (Au) on the PET film. We found that the sensitivity of the crack sensor improves/increases under the following conditions: (1) when Au is thin and Cr is thick; and (2) when the ratio of Au is lower than that of Cr, which also increases the transmittance of the sensor, along with its sensitivity. As we only need a small amount of Au to achieve high sensitivity of the sensor, we have suggested more efficient and economical fabrication methods. With this crack-based sensor, we were able to successfully detect finger motions and to distinguish various signs of American Sign Language (ASL).
    Language English
    Publishing date 2018-08-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s18092872
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Foot Plantar Pressure Measurement System Using Highly Sensitive Crack-Based Sensor.

    Park, Jieun / Kim, Minho / Hong, Insic / Kim, Taewi / Lee, Eunhan / Kim, Eun-A / Ryu, Jae-Kwan / Jo, YongJin / Koo, Jeehoon / Han, Seungyong / Koh, Je-Sung / Kang, Daeshik

    Sensors (Basel, Switzerland)

    2019  Volume 19, Issue 24

    Abstract: Measuring the foot plantar pressure has the potential to be an important tool in many areas such as enhancing sports performance, diagnosing diseases, and rehabilitation. In general, the plantar pressure sensor should have robustness, durability, and ... ...

    Abstract Measuring the foot plantar pressure has the potential to be an important tool in many areas such as enhancing sports performance, diagnosing diseases, and rehabilitation. In general, the plantar pressure sensor should have robustness, durability, and high repeatability, as it should measure the pressure due to body weight. Here, we present a novel insole foot plantar pressure sensor using a highly sensitive crack-based strain sensor. The sensor is made of elastomer, stainless steel, a crack-based sensor, and a 3D-printed frame. Insoles are made of elastomer with Shore A 40, which is used as part of the sensor, to distribute the load to the sensor. The 3D-printed frame and stainless steel prevent breakage of the crack-based sensor and enable elastic behavior. The sensor response is highly repeatable and shows excellent durability even after 20,000 cycles. We show that the insole pressure sensor can be used as a real-time monitoring system using the pressure visualization program.
    MeSH term(s) Equipment Design ; Foot Orthoses ; Gait/physiology ; Humans ; Models, Theoretical ; Pressure ; Printing, Three-Dimensional
    Language English
    Publishing date 2019-12-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s19245504
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: FEP Encapsulated Crack-Based Sensor for Measurement in Moisture-Laden Environment.

    Kim, Minho / Choi, Hyesu / Kim, Taewi / Hong, Insic / Roh, Yeonwook / Park, Jieun / Seo, SungChul / Han, Seungyong / Koh, Je-Sung / Kang, Daeshik

    Materials (Basel, Switzerland)

    2019  Volume 12, Issue 9

    Abstract: Among many flexible mechanosensors, a crack-based sensor inspired by a spider's slit organ has received considerable attention due to its great sensitivity compared to previous strain sensors. The sensor's limitation, however, lies on its vulnerability ... ...

    Abstract Among many flexible mechanosensors, a crack-based sensor inspired by a spider's slit organ has received considerable attention due to its great sensitivity compared to previous strain sensors. The sensor's limitation, however, lies on its vulnerability to stress concentration and the metal layers' delamination. To address this issue of vulnerability, we used fluorinated ethylene propylene (FEP) as an encapsulation layer on both sides of the sensor. The excellent waterproof and chemical resistance capability of FEP may effectively protect the sensor from damage in water and chemicals while improving the durability against friction.
    Language English
    Publishing date 2019-05-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma12091516
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Vital signal sensing and manipulation of a microscale organ with a multifunctional soft gripper.

    Roh, Yeonwook / Kim, Minho / Won, Sang Min / Lim, Daseul / Hong, Insic / Lee, Seunggon / Kim, Taewi / Kim, Changhwan / Lee, Doohoe / Im, Sunghoon / Lee, Gunhee / Kim, Dongjin / Shin, Dongwook / Gong, Dohyeon / Kim, Baekgyeom / Kim, Seongyeon / Kim, Sungyeong / Kim, Hyun Kuk / Koo, Bon-Kwon /
    Seo, Sungchul / Koh, Je-Sung / Kang, Daeshik / Han, Seungyong

    Science robotics

    2021  Volume 6, Issue 59, Page(s) eabi6774

    Abstract: Soft grippers that incorporate functional materials are important in the development of mechanically compliant and multifunctional interfaces for both sensing and stimulating soft objects and organisms. In particular, the capability for firm and delicate ...

    Abstract Soft grippers that incorporate functional materials are important in the development of mechanically compliant and multifunctional interfaces for both sensing and stimulating soft objects and organisms. In particular, the capability for firm and delicate grasping of soft cells and organs without mechanical damage is essential to identify the condition of and monitor meaningful biosignals from objects. Here, we report a millimeter-scale soft gripper based on a shape memory polymer that enables manipulating a heavy object (payload-to-weight ratio up to 6400) and grasping organisms at the micro/milliscale. The silver nanowires and crack-based strain sensor embedded in this soft gripper enable simultaneous measurement of the temperature and pressure on grasped objects and offer temperature and mechanical stimuli for the grasped object. We validate our miniaturized soft gripper by demonstrating that it can grasp a snail egg while simultaneously applying a moderate temperature stimulation to induce hatching process and monitor the heart rate of a newborn snail. The results present the potential for widespread utility of soft grippers in the area of biomedical engineering, especially in the development of conditional or closed-loop interfacing with microscale biotissues and organisms.
    MeSH term(s) Animals ; Bioengineering ; Biomedical Engineering ; Biomimetics ; Biotechnology/methods ; Calibration ; Elastic Modulus ; Equipment Design ; Hand Strength/physiology ; Humans ; Man-Machine Systems ; Materials Testing ; Nanowires ; Pressure ; Robotics ; Smart Materials/chemistry ; Snails/physiology ; Stress, Mechanical ; Temperature
    Chemical Substances Smart Materials
    Language English
    Publishing date 2021-10-13
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2470-9476
    ISSN (online) 2470-9476
    DOI 10.1126/scirobotics.abi6774
    Database MEDical Literature Analysis and Retrieval System OnLINE

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