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Sample entropy analysis of laser speckle fluctuations to suppress motion artifact on blood flow monitoring

Chinese Optics Letters 2022年第1期20卷 106-111页

作者： sungchul kim Evgenii kim Eloise Anguluan Jae Gwan kim Department of Biomedical Science&Engineering Institute of Integrated TechnologyGwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Center for Bionics Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Laser speckle imaging is a common technique to monitor blood *** fluctuations in speckle intensity can be related to the blood flow by calculating the speckle contrast,the ratio between the standard deviation of speckle fluctuations and the average ***,this simple statistic calculation is easily affected by motion *** this study,we applied sample entropy analysis instead of calculating standard deviations of the speckle *** to the traditional method,sample entropy-based speckle contrast increases linearly with flow rate but was shown to be more immune to sudden movements during an upper arm occlusion test.

关键词： laser speckle imaging sample entropy speckle contrast blood flow monitoring motion artifact

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Effective Task Scheduling for Embedded Systems Using Iterative Cluster Slack Optimization

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Circuits and Systems 2013年第8期4卷 479-488页

作者： Jongdae kim sungchul Lee Hyunchul Shin Electrical and Computer Engineering Hanyang University Ansan Kyeonggi-do South Korea

To solve computationally expensive problems, multiple processor SoCs (MPSoCs) are frequently used. Mapping of applications to MPSoC architectures and scheduling of tasks are key problems in system level design of embedded systems. In this paper, a cluster slack optimization algorithm is described, in which the tasks in a cluster are simultaneously mapped and scheduled for heterogeneous MPSoC architectures. In our approach, the tasks are iteratively clustered and each cluster is optimized by using the branch and bound technique to capitalize on slack distribution. The proposed static task mapping and scheduling method is applied to pipelined data stream processing as well as for batch processing. In pipelined processing, the tradeoff between throughput and memory cost can be exploited by adjusting a weighting parameter. Furthermore, an energy-aware task mapping and scheduling algorithm based on our cluster slack optimization is developed. Experimental results show improvement in latency, throughput and energy.

关键词： Multi-Processor Mapping Scheduling

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Segmented tomographic evaluation of structural degradation of carbon support in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2022年第11期31卷 359-367,I0010页

作者： Jung A.Hong Min-Hyoung Jung Sung Yong Cho Eun-Byeol Park Daehee Yang Young-Hoon kim Sang-Hyeok Yang Woo-Sung Jang Jae Hyuck Jang Hyo June Lee sungchul Lee Hu Young Jeong Young-Min kim Department of Energy Science Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Fuel Cell Core Parts Development Cell Hyundai Mobis Co.Ltd.Uiwang 16082Republic of Korea Electron Microscopy&Spectroscopy Team Korea Basic Science Institute(KBSI)Daejeon 34133Republic of Korea Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

The variation of the three-dimensional(3D)structure of the membrane electrode of a fuel cell during proton exchange cycling involves the corrosion/compaction of the carbon *** increasing degradation of the carbon structure continuously reduces the electrocatalytic performance of proton exchange membrane fuel cells(PEM-FCs).This phenomenon can be explained by performing 3D tomographic analysis at the ***,conventional tomographic approaches which present limited experimental feasibility,cannot perform such evaluation and have not provided sufficient structural information with statistical significance thus ***,a reliable methodology is required for the 3D geometrical evaluation of the carbon ***,we propose a segmented tomographic approach which employs pore network analysis that enables the visualization of the geometrical parameters corresponding to the porous carbon structure at a high *** approach can be utilized to evaluate the 3D structural degradation of the porous carbon structure after cycling in terms of local surface area,pore size distribution,and their 3D *** geometrical parameters of the carbon body were demonstrated to be substantially reduced owing to the cycling-induced *** information enables a deeper understanding of the degradation phenomenon of carbon supports and can contribute to the development of stable PEM-FC electrodes.

关键词： Electron tomography Fuel cell Proton exchange membrane Membrane electrode assembly Carbon corrosion

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Spider-inspired tunable mechanosensor for biomedical applications

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npj Flexible Electronics 2023年第1期7卷 444-452页

作者： Taewi kim Insic Hong Yeonwook Roh Dongjin kim Sungwook kim Sunghoon Im Changhwan kim Kiwon Jang Seongyeon kim Minho kim Jieun Park Dohyeon Gong Kihyeon Ahn Jingoo Lee Gunhee Lee Hak-Seung Lee Jeehoon Kang Ji Man Hong Seungchul Lee sungchul Seo Bon-Kwon Koo Je-sung Koh Seungyong Han Daeshik Kang Department of Mechanical Engineering Ajou UniversitySuwonKorea Department of Mechanical Engineering Pohang University of Science and TechnologyPohangKorea Department of Sustainable Environment Research Korea Institute of Machinery&MaterialsDaejeonKorea Department of Internal Medicine and Cardiovascular Center Seoul National University HospitalSeoulKorea Department of Neurology and Neurosurgery Ajou University School of MedicineSuwonKorea Department of Nano-chemical Biological and Environmental EngineeringSeokyeong UniversitySeoulKorea Institute on Aging Seoul National UniversitySeoulKorea

The recent advances of wearable sensors are remarkable but there are still limitations that they need to be refabricated to tune the sensor for target ***,biological sensory systems have the inherent potential to adjust their sensitivity according to the external environment,allowing for a broad and enhanced ***,we developed a Tunable,Ultrasensitive,Nature-inspired,Epidermal Sensor(TUNES)that the strain sensitivity was dramatically increased(GF~30k)and the pressure sensitivity could be tuned(10–254 kPa^(−1))by preset membrane *** sensor adjusts the sensitivity to the pressure regime by preset tension,so it can measure a wide range(0.05 Pa–25 kPa)with the best performance:from very small signals such as minute pulse to relatively large signals such as muscle contraction and *** verified its capabilities as a wearable health monitoring system by clinical trial comparing with pressure wire which is considered the current gold standard of blood pressure(r=0.96)and home health care system by binary classification of Old’s/Young’s pulse waves via machine learning(accuracy 95%).

关键词： Sensor adjust Spider

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The effects of feeding rate in juvenile olive flounder,Paralichthys olivaceus,fed commercial diet at the low temperature season

The effects of feeding rate in juvenile olive flounder,Paral...

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The 14th International Symposium on Fish Nutrition & Feeding

作者： Namyong Hwang Jun-Ho Lee Seunghyung Lee Young Chul kim Jun-Young Bae Okorie E.Okorie Mahmoud Mohseni Gun Hyun Park sungchul C.Bai Dept.of Aquaculture / Feeds and Foods Nutritional Research Center(FFNRC)Pukyong Nat’l University

Production of olive flounder(Paralichthys olivaceus) ranked the top among the Korean mariculture finfish *** of Korean aqua-farmers rely on farm-made raw fish-based diets (moist pellets,MP).They believe that moist pellets give better growth than do extruded pellets (EP).However,the use of moist pellets is being discouraged due to the water pollution resulting from such a practice and shortage of resources for making *** government also recommends the use of extruded diets in aquaculture and encourages the development of environmentally friendly diet with optimum feeding *** particular interest in the feeding practice is the optimum feeding rate,which has been found to be influenced by several factors among which is the rearing water *** temperatures in the winter season cause stress;reduce resistance to disease;and decrease feed intake and *** ongoing study is conducted to investigated the effects of feeding rates in juvenile olive flounder fed commercial diet(extrude pellet) at the low temperature season(below 15℃).Three replicated groups of fish (initial weight 5.3±0.22g) are fed commercial diet at the feeding rates of 0,0.5,1,1.5 and 2% body weight(BW)/day and *** feeding trial is conducted by using a semi-recirculating system with eighteen 30-L aquaria receiving filtered seawater from a center *** duration of the trial is four *** effects of feeding rates on growth performance,body composition and histology will be discussed later

关键词： Feeding rate olive flounder low temperature winter season

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