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Journal of biomedical engineering research : the o... 6건

  1. [국내논문]   고압산소챔버 중재가 알코올에 의한 산화적 스트레스 및 숙취 해소에 미치는 영향  

    권혁찬 (건양대학교대학원 의료공학과 ) , 박순원 (건양대학교대학원 의료공학과 ) , 조현정 (건양대학교 임상병리학과 ) , 강지현 (건양대학교병원 가정의학과 ) , 이현주 (건양대학교 물리치료학과 ) , 태기식 (건양대학교대학원 의료공학과)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 175 - 182 , 2018 , 1229-0807 ,

    초록

    The purpose of this study is to evaluate the reliability and effectiveness of hyperbaric oxygen chamber on alcohol-induced oxidative stress and hangover. In order to evaluate them, 20 healthy adults were tested for blood and hangover stress tests. When an exponential change was examined after 3 interventions (hangover drink, hyperbaric oxygen chamber, and normal chamber as placebo effect) of 1 hour, the heart rate of subjects experiencing a hyperbaric oxygen chamber showed a statistically significant decrease (p

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [국내논문]   정원창 구동형 인공중이의 출력 전달 방식에 따른 주파수 특성 연구  

    성기웅 (경북대학교병원 의공학과 ) , 신동호 (경북대학교 IT대학 전자공학과 ) , 나승대 (경북대학교병원 의공학과 ) , 이정현 (경북대학교 의과대학 의공학교실 ) , 김명남 (경북대학교 의과대학 의공학교실 ) , 조진호 (경북대학교 의공학연구소)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 183 - 187 , 2018 , 1229-0807 ,

    초록

    In this paper, we investigated the efficiency according to the output transmission method of the round window driving type AMEIs (active middle ear implants) through the cadaveric experiment. For the experiment, we fabricated DRT (direct rod transducer) and FMT (floating mass transducer) type vibrational transducers based on our previous studies and conducted their output characteristics were measured. TCBT (tri-coil bellows transducer) and DFMT (differential floating mass transducer) were implemented with the same driving force and electrical characteristics as one of DRT and FMT, respectively. In the experiment using three human temporal bone, normal stapes vibration was measured with 1 Pa in front of tympanic membrane, and then was compared with each output of transducers. From the comparison, the DRT type vibration transducer was superior in overall energy transfer efficiency, especially in the low frequency range. There was no difference in implantation difficulty between the two transducers. The results of this study suggest that the DRT type vibrational transducer is more efficient and needs further study to overcome the low frequency degradation in round window approaching with FMT.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [국내논문]   Three-dimensional Bio-printing Technique: Trend and Potential for High Volume Implantable Tissue Generation  

    Duong, Van-Thuy (Department of Biomedical Engineering, University of Ulsan ) , Kim, Jong Pal (Mobile Healthcare Laboratory, Samsung Advanced Institute Technology ) , Kim, Kwangsoo (Department of Electronics and Control Engineering, Hanbat National University ) , Ko, Hyoungho (Department of Electronics, Chungnam National University ) , Hwang, Chang Ho (Department of Physical Medicine and Rehabilitation, Ulsan University Hospital, University of Ulsan College of Medicine ) , Koo, Kyo-in (Department of Biomedical Engineering, University of Ulsan)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 188 - 207 , 2018 , 1229-0807 ,

    초록

    Recently, three-dimensional (3D) printing of biological tissues and organ has become an attractive interdisciplinary research topic that combines a broad range of fields including engineering, biomaterials science, cell biology, physics, and medicine. The 3D bioprinting can be used to produce complex tissue engineering scaffolds based on computer designs obtained from patient-specific anatomical data. It is a powerful tool for building structures by printing cells together with matrix materials and biochemical factors in spatially predefined positions within confined 3D structures. In the field of the 3D bioprinting, three major categories of the 3D bioprinting include the stereolithography-based, inkjet-based, and dispensing-based bioprinting. Some of them have made significant process. Each technique has its own advantages and limitations. Compared with non-biological printing, the 3D bioprinting should consider additional complexities: biocompatibility, degradability of printing materials, cell types, cell growth, cell viability, and cell proliferation factors. Numerous 3D bioprinting technologies have been proposed, and some of them have been making great progress in printing several tissues including multilayered skin, cartilaginous structures, bone, vasculature even heart and liver. This review summarizes basic principles and key aspects of some frequently utilized printing technologies, and introduces current challenges, and prospects in the 3D bioprinting.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [국내논문]   미생물연료전지와 에너지 하베스팅에 기반한 에너지 자립형 무선 센서 시스템  

    여정진 (전북대학교 바이오메디컬공학부 ) , 박소진 (전북대학교 바이오메디컬공학부 ) , 임종훈 (전북대학교 바이오메디컬공학부 ) , 양윤석 (전북대학교 바이오메디컬공학부)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 208 - 212 , 2018 , 1229-0807 ,

    초록

    Microbial fuel cell (MFC) technology has been attractive since it can not only treat organic waste in an eco-friendly way by digesting it but also generate electricity by the unique metabolic process of microbes. However, it hasn't been employed in practical use until now because it is hard to integrate a small electricity up to an adequate amount of electric power and difficult to keep its bio-electric activity consistent. In this study, we combined an energy harvester with MFC (MFC-EH) to make the power-integration convenient and developed an energy self-sustainable wireless sensor system driven by a stable electric power produced by MFC-EH. Additionally, we build the low power application measuring data to be cast by the web in real-time so that it can be quickly and easily accessed through the internet. The proposed system could contribute to improvement of waste treatment and up-cycling technologies in near future.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [국내논문]   합성곱 신경망을 활용한 위내시경 이미지 분류에서 전이학습의 효용성 평가  

    박성진 (가천대학교 의과대학 의공학교실 ) , 김영재 (가천대학교 의과대학 의공학교실 ) , 박동균 (가천대학교 길병원 소화기내과 ) , 정준원 (가천대학교 길병원 소화기내과 ) , 김광기 (가천대학교 의과대학 의공학교실)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 213 - 219 , 2018 , 1229-0807 ,

    초록

    Stomach cancer is the most diagnosed cancer in Korea. When gastric cancer is detected early, the 5-year survival rate is as high as 90%. Gastroscopy is a very useful method for early diagnosis. But the false negative rate of gastric cancer in the gastroscopy was 4.6~25.8% due to the subjective judgment of the physician. Recently, the image classification performance of the image recognition field has been advanced by the convolutional neural network. Convolutional neural networks perform well when diverse and sufficient amounts of data are supported. However, medical data is not easy to access and it is difficult to gather enough high-quality data that includes expert annotations. So This paper evaluates the efficacy of transfer learning in gastroscopy classification and diagnosis. We obtained 787 endoscopic images of gastric endoscopy at Gil Medical Center, Gachon University. The number of normal images was 200, and the number of abnormal images was 587. The image size was reconstructed and normalized. In the case of the ResNet50 structure, the classification accuracy before and after applying the transfer learning was improved from 0.9 to 0.947, and the AUC was also improved from 0.94 to 0.98. In the case of the InceptionV3 structure, the classification accuracy before and after applying the transfer learning was improved from 0.862 to 0.924, and the AUC was also improved from 0.89 to 0.97. In the case of the VGG16 structure, the classification accuracy before and after applying the transfer learning was improved from 0.87 to 0.938, and the AUC was also improved from 0.89 to 0.98. The difference in the performance of the CNN model before and after transfer learning was statistically significant when confirmed by T-test (p

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [국내논문]   전기화학적 기법에 의한 미생물연료전지 내부저항 특성 파악 및 전력관리시스템 연계 전압 변화와 유기물 저감에 미치는 영향  

    장재경 (국립농업과학원 농업공학부 에너지환경공학과 ) , 박혜민 (국립농업과학원 농업공학부 에너지환경공학과 ) , 김태영 (국립농업과학원 농업공학부 에너지환경공학과 ) , 양윤석 (전북대학교 바이오메디컬공학부 ) , 여정진 (전북대학교 바이오메디컬공학부 ) , 강석원 (국립농업과학원 농업공학부 에너지환경공학과 ) , 백이 (국립농업과학원 농업공학부 에너지환경공학과 ) , 권진경 (국립농업과학원 농업공학부 에너지환경공학과)
    Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering v.39 no.5 ,pp. 220 - 228 , 2018 , 1229-0807 ,

    초록

    The internal resistance of microbial fuel cell (MFC) using stainless steel skein for oxidizing electrode was investigated and the factors affecting the voltage generation were identified. We also investigated the effect of power management system (PMS) on the usability for MFC and the removal efficiency of organic pollutants. The performance of a stack microbial fuel cell connected with (PMS) or PMS+LED was analyzed by the voltage generation and organic matter reduction. The maximum power density of the unit cells was found to be $5.82W/m^3$ at $200{\Omega}$ . The maximum current density was $47.53A/m^3$ without power overshoot even under $1{\Omega}$ . The ohmic resistance ( $R_s$ ) and the charge transfer resistance ( $R_{ct}$ ) of the oxidation electrode using stainless steel skein electrode, were $0.56{\Omega}$ and $0.02{\Omega}$ , respectively. However, the sum of internal resistance for reduction electrode using graphite felts loaded Pt/C catalyst was $6.64{\Omega}$ . Also, in order to understand the internal resistance, the current interruption method was used by changing the external resistance as $50{\Omega}$ , $300{\Omega}$ , $5k{\Omega}$ . It has been shown that the ohm resistance ( $R_s$ ) decreased with the external resistance. In the case of a series-connected microbial fuel cell, the reversal phenomenon occurred even though two cells having the similar performance. However, the output of the PMS constantly remained for 20 hours even when voltage reversal occurred. Also the removal ability of organic pollutants (SCOD) was not reduced. As a result of this study, it was found that buffering effect for a certain period of time when the voltage reversal occurred during the operation of the microbial fuel cell did not have a serious effect on the energy loss or the operation of the microbial fuel cell.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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