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Hybrid Biodegradable Polymer Stent Fabrication Using 3D Printers and Integration with Wireless sensors for Real-Time Pressure Monitoring In Blood Vessels

Hybrid Biodegradable Polymer Stent Fabrication Using 3D Prin...

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International Conference on Solid State sensors and Actuators (TRANSDUCERS)

作者： Jin-Liang Wei Nomin-Erdene Oyunbaatar Dong-Su Kim Dong-Weon Lee Department of Mechanical Engineering Chonnam National University Gwangju South Korea Center for Next-Generation Sensor Research and Development Chonnam National University Gwangju South Korea Advanced Medical Device Research Center for Cardiovascular Disease Chonnam National University Gwangju South Korea

Cardiovascular diseases (CVD) continue to be a major cause of mortality worldwide. Although traditional treatment using stents has been effective in managing these diseases, it can lead to several adverse effects, including in-stent restenosis. To address this issue, we present the development of a novel hybrid polymer stent composed of polycaprolactone (PCL) and polylactic acid (PLA) that exhibits improved bending flexibility and radial force. The hybrid stent is integrated with a wireless sensor to enable real-time monitoring of pressure changes in the blood vessel. A MEMS-based LC-type wireless pressure sensor is fabricated, with unique microstructures incorporated into the stent to enhance the binding strength between the sensor and the stent. This approach holds promise for improving the clinical outcomes of CVD patients by providing accurate and timely detection of restenosis.

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Enhancing Sensitivity in Wireless Capacitive Pressure sensors Via Highly Flexible Lc Circuits Utilizing Porous Polydimethylsiloxane Dielectric Layer

SSRN

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SSRN 2023年

作者： Thorali, Niranjan Kim, Dong Su Lee, Haeyeon Kim, Dong Rip Lee, Dong-Weon School of Mechanical Engineering Chonnam National University Gwangju61186 Korea Republic of Center for Next-Generation Sensor Research and Development Chonnam National University Gwangju61186 Korea Republic of Advanced Medical Device Research Centre for Cardiovascular Disease Chonnam National University Gwangju61186 Korea Republic of School of Mechanical Engineering Hanyang University Seoul04763 Korea Republic of

In this study, we introduce a highly flexible LC circuit-based wireless capacitive pressure sensor (CPS) that utilizes porous polydimethylsiloxane (PDMS) as a dielectric layer, showcasing its transformative potential in tactile sensing, physiological monitoring, and flexible electronics. To optimize sensor performance, various porous PDMS thin films with different porosities (ranging from 0% to 75%) were prepared using a steaming method, and their properties were thoroughly analyzed through field emission scanning electron microscopy (FE-SEM) and capacitance measurement. Remarkably, the sensor with a 75% porous PDMS film demonstrated sensitivity enhancement of up to 11 times compared to the 0% porous (pristine) PDMS film when subjected to a 300 g weight. Moreover, real-time resonance frequency analysis with a network analyzer allowed for the detection of tiny pressure changes in an artificial blood vessel. Finally, the flexibility of the wireless CPS was investigated by studying various parameters, including body temperature, facial expressions like smiling, selected speech characters (M, N, T, L), and swallowing actions. © 2023, The Authors. All rights reserved.

关键词： Polydimethylsiloxane

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Mea-On-Cantilever – A Novel Multifunctional Device for Drug Toxicity Screening in Cardiomyocytes

Mea-On-Cantilever – A Novel Multifunctional Device for Drug...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Pooja P. Kanade Nomin-Erdene Oyunbaatar Yun-Jin Jeong Dong-Weon Lee MEMS and Nanotechnology Lab School of Mechanical Engineering Chonnam National University Gwangju Korea Center for Next Generation Sensor Research and Development Chonnam National University Gwangju Korea

ISBN: (数字)9781665419123

ISBN: (纸本)9781665430241

This paper demonstrates an easy-to-use dual-function biosensor for real-time monitoring of drug-induced cardiac toxicity screening, by measuring both electrophysiology and mechanophysiology of drug-treated cardiomyocytes simultaneously. The proposed biosensor consists of a photosensitive polymer cantilever on which microelectrodes are patterned. Electrophysiology is measured by recording field potential using microelectrode array (MEA), and contractile motion is measured using cantilever deflection upon culturing of cardiomyocytes. This dual-function biosensor has been tested for its reliability for drug screening by adding Verapamil to the cell culture and assessing the outputs in synchrony. Field potential duration (FPD) reduced on increasing concentration (IC 50 =166.2 nM), as did contraction force (IC 50 =242.9 nM). This biosensor is a reliable next-generation device of drug toxicity screening.

关键词： Drugs Microelectrodes Toxicology Electrophysiology Biosensors Reliability Motion measurement

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Raptor Encoding for Low-Latency Concurrent Multi-PDU Session Transmission with Security Consideration in B5G Edge Network

arXiv

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arXiv 2023年

作者： Guo, Zhongfu Ji, Xinsheng You, Wei Xu, Mingyan Zhao, Yu Cheng, Zhimo Zhou, Deqiang the Department of next-generation mobile communication and cyber space security Information Engineering University Zhengzhou450001 China the National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou450000 China Purple Mountain Laboratories: Networking Communications and security Nanjing211111 China

In B5G edge networks, end-to-end low-latency and high-reliability transmissions between edge computing nodes and terminal devices are essential. This paper investigates the queue-aware coding scheduling transmission of randomly arriving data packets, taking into account potential eavesdroppers in edge networks. To address these concerns, we introduce SCLER, a Protocol Data Units (PDU) Raptor-encoded multi-path transmission method that overcomes the challenges of a larger attack surface in Concurrent Multipath Transfer (CMT), excessive delay due to asymmetric delay&bandwidth, and lack of interaction among PDU session bearers. We propose a secure and reliable transmission scheme based on Raptor encoding and distribution that incorporates a queue length-aware encoding strategy. This strategy is modeled using Constrained Markov Decision Process (CMDP), and we solve the constraint optimization problem of optimal decision-making based on a threshold strategy. Numerical results indicate that SCLER effectively reduces data leakage risks while achieving the optimal balance between delay and reliability, thereby ensuring data security. Importantly, the proposed system is compatible with current mobile networks and demonstrates practical applicability. Copyright © 2023, The Authors. All rights reserved.

关键词： Network security

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Workload Distribution with Rateless Encoding: A Low-Latency Computation Offloading Method within Edge Networks

arXiv

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arXiv 2023年

作者： Guo, Zhongfu Ji, Xinsheng You, Wei Zhao, Yu Yi, Bai Wang, Lingwei Department of next-generation mobile communication and cyber space security Information Engineering University Zhengzhou450001 China National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou450000 China Purple Mountain Laboratories: Networking Communications and security Nanjing211111 China

This paper introduces REDC, a comprehensive strategy for offloading computational tasks within mobile Edge Networks (EN) to Distributed Computing (DC) after Rateless Encoding (RE). Despite the efficiency, reliability, and scalability advantages of distributed computing in ENs, straggler-induced latencies and failures pose significant challenges. Coded distributed computing has gained attention for its efficient redundancy computing, alleviating the impact of stragglers. Yet, current research predominantly focuses on tolerating a predefined number of stragglers with minimal encoding redundancy. Furthermore, nodes within edge networks are characterized by their inherent heterogeneity in computation, communication, and storage capacities, and unpredictable straggler effects and failures. To our knowledge, existing encoding offloading approaches lack a systematic design and unified consideration of these characteristics. REDC addresses these issues by adaptively encoding tasks, then distributing the workload based on node variations. In the face of unpredictability failures, the rateless encoding adaptation provides resilience to dynamic straggler effects. Considering the node heterogeneity and system status, tasks are offloaded to optimal subset"valid" nodes. Load distribution decisions are made based on updates to queuing theory modeling through state feedback. The REDC framework is applicable to EN by improving resource utilization and reducing task sequence execution delays. Experimental results demonstrate our method’s effectiveness and resilient performance, maintaining efficacy even in the presence of unstable nodes. Copyright © 2023, The Authors. All rights reserved.

关键词： Queueing theory

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High-Performance Stretchable Piezo-Electrically Enhanced Hybrid Triboelectric Nanogenerator Generated Maxwell's Displacement Current Towards Underwater Wireless Communication Assisted Self-Powered Biomechanical Signal Monitoring

SSRN

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SSRN 2024年

作者： Mahanty, Biswajit Ghosh, Sujoy Kumar Lee, Dong-Weon MEMS and Nanotechnology Laboratory School of Mechanical Engineering Chonnam National University Gwangju61186 Korea Republic of Department of Condensed Matter Physics and Material Sciences S.N. Bose National Centre for Basic Sciences Block JD Sector III Salt Lake Kolkata7000106 India Center for Next-Generation Sensor Research and Development Chonnam National University Gwangju61186 Korea Republic of Advanced Medical Device Research Center for Cardiovascular Disease Chonnam National University 77 Yongbong-ro Buk-gu Gwangju61186 Korea Republic of

This study proposes an underwater wireless communication approach for transmission of biomechanical signals that relies on Maxwell's displacement current generated by a stretchable piezoelectric-enhanced triboelectric hybrid nanogenerator (PET-HNG). A high performing nano-/micro-composite film was prepared by embedding MXene nanosheets and ferro-/piezo-electric LiNbO3 microparticles into Ecoflex polymer matrix. The MXene sheets function as a micro capacitor network while LiNbO3 microparticles play a crucial role in the resulting dipole orientation and electrical polarization enhancing surface charge density to improve the triboelectric energy harvesting performance. The realized PET-HNG using this composite film shows greatly enhanced output performance in comparison to piezoelectric and triboelectric nanogenerators individually, with open circuit output voltage of 455 V, short circuit current of 140 µA, instantaneous power density (P) of 15.6 W m-2 and energy conversion efficiency of 78.5%. Indeed, the PET-HNG shows superior output performance stability even after releasing the stretching strain (30% for 20 times), which makes it a promising self-powered wearable sensor for real-time monitoring of biomechanical signals from human body movement. The proposed stretchable PET-HNG can promote the development of self-powered intelligent wearable sensors and flexible electronics. © 2024, The Authors. All rights reserved.

关键词： Nanogenerators

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Vertically aligned one-dimensional ZnO/V2O5 core-shell hetero-nanostructure for photoelectrochemical water splitting

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Journal of Energy Chemistry 2020年第10期29卷 262-274页

作者： Tian-Feng Hou Muhammad Ali Johar Ramireddy Boppella Mostafa Afifi Hassan Swati J.Patil Sang-Wan Ryu Dong-Weon Lee MEMS and Nanotechnology Laboratory School of Mechanical EngineeringChonnam National UniversityGwangju 61186Republic of Korea Center for Next-generation Sensor Research and Development Chonnam National UniversityGwangju 61186Republic of Korea Department of Physics Chonnam National UniversityGwangju 61186Republic of Korea Nanomaterials Laboratory Inorganic and Physical Chemistry DivisionCSIR-Indian Institute of Chemical TechnologyHyderabad 500007TelanganaIndia

The vertically aligned one-dimensional(1 D)core-shell structure can maximize the exposure and use of the functionally active surface while maintaining the geometric effects caused by the underlying ***,we have fabricated 1 D vertically aligned ZnO/V2O5 core-shell hetero-nanostructure nanorod arrays(NRs)for photoelectrochemical(PEC)water ***/V2O5 NRs were prepared through the hydrothermal growing of ZnO NRs and then radio frequency(RF)magnetron sputtering deposition of V2O5 for 300,600 and 900 *** photocurrent density of ZnO/V2O5-based photoanodes was gradually increased with the sputtering time,reaching the maximum value of 1.21 m A/cm^2 at 1.23 V *** hydrogen electrode(RHE)for ZnO/V2O5-600,whereas for pure ZnO-based photoanode was 0.42 mA/cm^*** incident photon to electron conversion efficiency(IPCE)of ZnO/V2O5-600 evaluated to be 82.3%which was 2.3 times higher than that of ZnO(36.4%).The improved PEC performance of ZnO/V2O5-600 is because the core-shell structure with a moderate thickness of the V2O5 layer has the extremely high carrier density,largest electrochemically active surface area(ECSA),largest carrier density,lowest charge recombination rate,and the longest lifetime of e-h pairs due to the formation of the staggered gap *** study provides an effective way to design and fabrication of hetero-nanostructures for highefficiency photoelectrodes.

关键词： ZnO/V2O5 core-shell hetero-nanostructure Staggered heterojunction PEC water splitting

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An Operational Assessment Framework for Near Real-time Cropland Dynamics:Toward Sustainable Cropland Use in Mid-Spine Belt of Beautiful China

Journal of Remote Sensing

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Journal of Remote Sensing 2023年第1期3卷 247-263页

作者： Zhenrong Du Le Yu Xin Chen Xiyu Li Dailiang Peng Shijun Zheng Pengyu Hao Jianyu Yang Huadong Guo Peng Gong Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing 100084China Ministry of Education Ecological Field Station for East Asian Migratory Birds Beijing 100084China Tsinghua University(Department of Earth System Science)-Xi’an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping Beijing 100084China Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China University of Chinese Academy of Sciences Beijing 100049China Food and Agriculture Organization of the United Nations Viale delle Terme di Caracalla00153 RomeItaly College of Land Science and Technology China Agricultural UniversityBeijing 100193China Department of Geography Department of Earth Sciences and Institute for Climate and Carbon NeutralityUniversity of Hong KongHong Kong 999077China

Cropland monitoring is a crucial component for a broad user community from Land Use and Land Cover Change study to food security policy *** with the rich natural ecological environment and variable agricultural production conditions of Mid-Spine Belt of Beautiful China(MSBBC),this study developed a novel operational assessment framework that combined the near real-time land cover mapping platform(i.e.,FROM-GLC Plus),the FAO Agricultural Stress Index System,and the land degradation monitoring method suggested by United Nations Convention to Combat Desertification for the timely monitoring of cropland extent change,cropland conditions,and cropland *** integrated monitoring system,this framework can provide convenient access to high-spatiotemporalresolution cropland maps(30 m,dekadal)and instant(near real time)cropland *** to the monitoring results,we found that the abnormally high temperatures of summer 2022 adversely affected crop health in the southwest of ***,our results suggested that China’s ecological restoration projects made remarkable achievement in *** productivity of more than 70% of cropland in MSBBC has improved,and only~6% cropland(~3.69×10^(4) km^(2))has degraded since 2000,mainly distributed in cropland with steep slope,insufficient precipitation,and intensive ***-specific measures,such as conservation tillage,improved tillage systems,and cropland ecological projects,should be adopted for sustainable cropland use and further increase in land carrying capacity of MSBBC to achieve balanced east-west development in China.

关键词： Sustainable southwest policy

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High-Performance Polyaniline-Coated Electrospun P(Vdf-Trfe)/Batio3 Nanofiber-Based Flexible Piezoelectric Nanogenerator

SSRN

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SSRN 2023年

作者： Mahanty, Biswajit Ghosh, Sujoy Kumar Lee, Dong-Weon MEMS and Nanotechnology Laboratory School of Mechanical Engineering Chonnam National University Gwangju61186 Korea Republic of Department of Condensed Matter Physics and Material Sciences S.N. Bose National Centre for Basic Sciences Block JD Sector III Salt Lake Kolkata700106 India Advanced Medical Device Research Center for Cardiovascular Disease Chonnam National University 77 Yongbong-ro Buk-gu Gwangju61186 Korea Republic of Center for Next-Generation Sensor Research and Development Chonnam National University Gwangju61186 Korea Republic of

The rapid progress and assimilation of the Internet of Things in modern lifestyles has sparked increased interest in self-powered electronics and wearable sensors. In this study, we present a simple, facile, and cost-effective approach to fabricate polyaniline (PANI)-coated ferroelectric barium titanate nanoparticle (BT NP)-embedded poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) nanocomposite nanofiber (PANI@(P(VDF-TrFE)/BT) mats. The addition of PANI-coated BT NPs into the nanofibers greatly enhances the piezoelectric coefficient (d33 ≈ 62 pC N−1), leading to an improved output voltage. Meanwhile, the conductive PANI also improves the electrically conductive network, resulting in enhanced current output. The proposed flexible piezoelectric nanogenerator yielded an excellent figure of merit ([[EQUATION]]), significantly enhancing energy-harvesting performance (an open-circuit output voltage of ~68 V, a short-circuit current of ~3 µA, and a remarkable power density of 225 mW m−2). Furthermore, the fabricated flexible devices exhibited an average mechano-sensitivity of 1.2 V kPa−1, showcasing its potential for widespread application in self-powered wearable sensors capable of capturing various human motions in applications such as gesture monitoring and finger motion detection. © 2023, The Authors. All rights reserved.

关键词： Nanofibers

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Different vantage points amongst different stakeholders in NATECH (NAtural hazard-triggered TECHnological) disasters: A case from the 2018 Mt. Anak Krakatau eruption and tsunami 12

Different vantage points amongst different stakeholders in N...

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12th ACEH International Workshop on Sustainable Tsunami Disaster Recovery: Sharing Experience, Knowledge and Culture 2019, AIWEST-DR 2019

作者： Pelupessy, Dicky Jibiki, Yasuhito Lestari, Fatma Zulys, Agustino Imamura, Fumihiko Faculty of Psychology Disaster Risk Reduction Center Universitas Indonesia Indonesia Next Generation Volcano Researcher Development Program Graduate School of Science Tohoku University Japan Faculty of Public Health Disaster Risk Reduction Center Universitas Indonesia Indonesia Faculty of Mathematics and Natural Sciences Disaster Risk Reduction Center Universitas Indonesia Indonesia International Research Institute of Disaster Science Tohoku University Japan

Previous literature on natech (Natural hazard-triggered TECHnological) disasters argue prevailing difficulties in establishing collective response and sharing common knowledge amongst different and a variety of stakeholders. We aim to describe such challenges using a case study and examine the relationship amongst the actors. Our case study focused on the 2018 Mt. Anak Krakatau eruption and the tsunami triggered by it. In this disaster, one of the largest industrial zones in Indonesia was partially affected. Our study largely explains the results based on some series of discussions with private companies and representatives of the residents collected in 2019 (from February to July). We also referred to the publicly available information, which relevant agencies in the Government of Indonesia issued. Although there were no physical damages in the factories and no causalities, staff in many facilities were worried about the situation and the surrounding residents were also scared how things would be going. The residents were not able to behave in collectively organized manner, because they faced with a lack of the synthesized and coordinated information and instructions. The residents were fully aware of the risk of natech disaster, but such awareness was not necessarily connected with reasonable risk perception and organized behaviours. Relevant organizations complied with their own protocols, but it did not necessarily bring better consequences. The meteorological agency disseminated information in their limited capacity. The volcano monitoring agency paid the limited focus on the volcano and its adjacent sea area. The national and local disaster management agencies tried to integrate technical information, but it took time. The companies carefully gathered information, but their priorities initially went to their internal response, including taking care of the families of their employees. These findings indicate that efforts were done in the right course separately

关键词： Tsunamis

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