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Highly Efficient,Dual‑Functional Self‑Assembled Electrospun Nanofiber Filters for Simultaneous PM Removal and On‑Site Eye‑Readable Formaldehyde Sensing

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Advanced Fiber Materials 2023年第3期5卷 1088-1103页

作者： jin yeong song Seongmin Kim Jaeseong Park Sang Min Park School of Mechanical Engineering Pusan National University63‑2 Busan University‑RoGeumjeong‑GuBusan 46241South Korea

Air pollution containing particulate matter(PM)and volatile organic compounds has caused magnificent burdens on indi-vidual health and global economy.Although advances in highly efficient or multifunctional nanofiber filters have been achieved,many existing filters can only deal with one type of air pollutant,such as capturing PM or absorbing and detecting toxic gas.Here,highly efficient,dual-functional,self-assembled electrospun nanofiber(SAEN)filters were developed for simultaneous PM removal and onsite eye-readable formaldehyde sensing fabricated on a commercial fabric mask.With the use of an electrolyte solution containing a formaldehyde-sensitive colorimetric agent as a collector during electrospinning,the one-step fabrication of the dual-functional SAEN filter on commercial masks,such as a fabric mask and a daily dispos-able mask,was achieved.The electrolyte solution also allowed the uniform deposition of electrospun nanofibers,thereby achieving the high efficiency of PM filtration with an increased quality factor up to twice that of commercial masks.The SAEN filter enabled onsite and eye-readable formaldehyde gas detection by changing its color from yellow to red under a 5 ppm concentrated formaldehyde gas atmosphere.The repetitive fabrication and detachment of the SAEN filter on a fabric mask minimized the waste of the mask while maintaining high filtration efficiency by replenishing the SAEN filters and reusing the fabric mask.Given the dual functionality of SAEN filters,this process could provide new insights into design-ing and developing high performance and dual-functional electrospun nanofiber filters for various applications,including individual protection and indoor purification applications.

关键词： Electrospinning Nanofiber Self-assembly PM removal Formaldehyde sensing

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Adaptive Electrospinning System Based on Reinforcement Learning for Uniform‑Thickness Nanofiber Air Filters

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Advanced Fiber Materials 2023年第2期5卷 617-631页

作者： Seok Hyeon Hwang jin yeong song Hyun Il Ryu Jae Hee Oh Seungwook Lee Donggeun Lee Dong Yong Park Sang Min Park School of Mechanical Engineering Pusan National University63‑2 Busan University‑roGeumjeong‑guBusan 46241South Korea Smart Manufacturing Technology R&D Group Korea Institute of Industrial Technology320 Techno Sunhwan‑roYuga‑eupDalseong‑gunDaegu 42994Republic of Korea

Electrospinning is a simple and versatile method to produce nanofiber filters.However,owing to bending instability that occurs during the electrospinning process,electrospinning has frequently produced a non-uniform-thickness nanofiber filter,which deteriorates its air filtration.Here,an adaptive electrospinning system based on reinforcement learning(E-RL)was developed to produce uniform-thickness nanofiber filters.The E-RL accomplished a real-time thickness measurement of an electrospun nanofiber filter by measuring the transmitted light through the nanofiber filter using a camera placed at the bottom of the collector and converting it into thickness using the Beer–Lambert law.Based on the measured thickness,the E-RL detected the non-uniformity of the nanofiber filter thickness and manipulated the movable collector to alleviate the non-uniformity of the thickness by a pre-trained reinforcement learning(RL)algorithm.For the training of the RL algo-rithm,the nanofiber production simulation software based on the empirical model of the deposition of the nanofiber filter was developed,and the training process of the RL algorithm was repeated until the optimal policy was achieved.After the training process with the simulation software,the trained model was transferred to the adaptive electrospinning system.By the movement of the collector under the optimal strategy of RL algorithm,the non-uniformity of such nanofiber filters was significantly reduced by approximately five times in standard deviation and error for both simulation and experiment.This finding has great potential in improving the reliability of electrospinning process and nanofiber filters used in research and industrial fields such as environment,energy,and biomedicine.

关键词： Electrospinning Nanofiber filter Uniform thickness Reinforcement learning Deep Q-network

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Correction to:Adaptive Electrospinning System Based on Reinforcement Learning for Uniform‑Thickness Nanofiber Air Filters

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Advanced Fiber Materials 2023年第2期5卷 695-695页

Correction to:Advanced Fiber Materials https://***/10.1007/s42765-022-00247-3 In this article the author name Dong Yong Park was incorrectly written as Dong Young Park.The original article has been corrected.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

关键词： Uniform neutral corrected

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Intelligent reflecting surface for sum rate enhancement in MIMO systems

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Digital Communications and Networks 2024年第1期10卷 94-100页

作者： Chan-Yeob Park Ji-Sung Jung yeong-Rong Lee Beom-Sik Shin Hyoung-Kyu song Department of Information and Communication Engineering Sejong UniversitySeoulGwangjin-guGunja-dong 98Republic of Korea Department of Convergence Engineering for Intelligent Drone Sejong University SeoulGwangjin-guGunja-dong 98Republic of Korea

The research for the Intelligent Reflecting Surface(IRS)which has the advantages of cost and energy efficiency has been studied.Channel capacity can be effectively increased by appropriately setting the phase value of IRS elements according to the channel conditions.However,the problem of obtaining an appropriate phase value of IRs is difficult to solve due to the non-convex problem.This paper proposes an iterative algorithm for the alternating optimal solution in the Single User Multiple-Input-Multiple-Output(SU-MIMO)systems.The proposed iterative algorithm finds an alternating optimal solution that is the phase value of IRS one by one.The results show that the proposed method has better performance than that of the randomized IRS systems.The number of iterations for maximizing the performance of the proposed algorithm depends on the channel state between the IRS and the receiver.

关键词： Intelligent reflecting surface MIMO Sum rate

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Highly conductive,stretchable,durable,skin-conformal dry electrodes based on thermoplastic elastomer-embedded 3D porous graphene for multifunctional wearable bioelectronics

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Nano Research 2023年第5期16卷 7627-7637页

作者： Shipeng Zhang MdSharifuzzamn SM Sohel Rana MdAbu Zahed Sudeep Sharma Youngdo Shin Hyesoo song Jae yeong Park Department of Electronic Engineering Kwangwoon University447-1 Wolgye-dongNowon-guSeoul 01897Republic of Korea

Long-term bioelectric potential recording requires highly reliable wearable dry electrodes.Laser-induced graphene(LIG)dry electrodes on polyimide(PI)films are difficult to conform to the skin due to the non-stretchability and low flexibility of PI films.As a result,high interface impedance and motion artifacts can occur during body movements.Transferring LIG to flexible substrates such as polydimethylsiloxane(PDMS)and Ecoflex allows for stretchability and flexibility.However,the transfer process produces a significant loss of conductivity destroying the structural function and electron conduction properties of the LIG.We found robust physical and chemical bonding effects between LIG and styrene-ethylene-butylene-styrene(SEBS)thermoplastic elastomer substrates and proposed a simple and robust low-conductivity loss transfer technique.Successfully embedded LIG onto SEBS to obtain high stretchability,high flexibility,low conductivity losses.Electrophoretic deposition(EPD)of poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid(PEDOT:PSS)on LIG forms an ultrathin polymer conductive coating.The deposition thickness of the conductive polymer is adjusted by controlling the EPD deposition time to achieve optimal conductivity and chemical stability.SEBS/LIG/PEDOT:PSS(SLPP)dry electrodes have high conductivity(114Ω/Sq),stretchability(300%)and reliability(30%stretch,15,000 cycles),low electrode-skin impedance(14.39 kΩ,10 Hz).The detected biopotential signal has a high signal-to-noise ratio(SNR)of 35.78 dB.Finally,the feasibility of SLPP dry electrodes for long-term biopotential monitoring and biopotential-based human-machine interface control of household appliances was verified.

关键词： graphene-embedded elastomers low conductivity loss process highly flexible and stretchable electrophoretic deposition electroencephalography-electrocardiography-electromyography(EEG-ECG-EMG)monitoring

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Functional photonic structures for external interaction with flexible/ wearable devices

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Nano Research 2021年第9期14卷 2904-2918页

作者： Young jin Yoo Se-Yeon Heo yeong Jae Kim Joo Hwan Ko Zafrin Ferdous Mira Young Min song School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea Korea Institute of Ceramic Engineering&Technology Ceramics Test-Bed Center3321 Gyeongchung-daeroSindun-myeonIcheon-si Gyeonggi-do 17303Republic of Korea Anti-Viral Research Center Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea AI Graduate School Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea

In addition to vital functions,more subsidiary functions are being expected from wearable devices.The wearable technology thus far has achieved the ability to maintain homeostasis by continuously monitoring physiological signals.The quality of life improves if,through further developments of wearable devices to detect,announce,and even control unperceptive or noxious signals from the environment.Soft materials based on photonic engineering can fulfil the abovementioned functions.Due to the flexibility and zero-power operation of such materials,they can be applied to conventional wearables without affecting existing functions.The achievements to freely tailoring a broad range of electromagnetic waves have encouraged the development of wearable systems for independent recognition/manipulation of light,pollution,chemicals,viruses and heat.Herein,the role that photonic engineering on a flexible platform plays in detecting or reacting to environmental changes is reviewed in terms of material selection,structural design,and regulation mechanisms from the ultraviolet to infrared spectral regions.Moreover,issues emerging with the evolution of the wearable technology,such as Joule heating,battery durability,and user privacy,and the potential solution strategies are discussed.This article provides a systematic review of current progress in wearable devices based on photonic structures as well as an overview of possible ubiquitous advances and their applications,providing diachronic perspectives and future outlook on the rapidly growing research field of wearable technology.

关键词： photonic structure wearable device health care device colorimetric sensor radiative cooling infrared camouflage

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Assessment of pathogens and risk factors associated with bloodstream infection in the year after pediatric liver transplantation

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World Journal of Gastroenterology 2022年第11期28卷 1159-1171页

作者： yeong Eun Kim Ho Jung Choi Hye-jin Lee Hyun Ju Oh Mi Kyoung Ahn Seak Hee Oh Jung-Man Namgoong Dae Yeon Kim Won Kyoung Jhang Seong Jong Park Dong-Hwan Jung Deok Bog Moon Gi-Won song Gil-Chun Park Tae-Yong Ha Chul-Soo Ahn Ki-Hun Kim Shin Hwang Sung Gyu Lee Kyung Mo Kim Department of Pediatrics Asan Medical Center Children's HospitalUniversity of Ulsan College of MedicineSeoul 05505South Korea Division of Pediatric Surgery Department of SurgeryAsan Medical Center Children's HospitalUniversity of Ulsan College of MedicineSeoul 05505South Korea Division of Hepatobiliary Surgery and Liver Transplantation Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea

BACKGROUND Bloodstream infection(BSI)is one of the most significantly adverse events that can occur after liver transplantation(LT)in children.AIM To analyze the profile of BSI according to the postoperative periods and assess the risk factors after pediatric LT.METHODS Clinical data,collected from medical charts of children(n=378)who underwent primary LT,were retrospectively reviewed.The primary outcome considered was BSI in the first year after LT.Univariate and multivariate analyses were performed to identify risk factors for BSI and respective odds ratios(ORs).RESULTS Of the examined patients,106(28%)experienced 162 episodes of pathogen-confirmed BSI during the first year after LT.There were 1.53±0.95 episodes per children(mean±SD)among BSIcomplicated patients with a median onset of 0.4 mo post-LT.The most common pathogenic organisms identified were Coagulase-negative staphylococci,followed by Enterococcus spp.and Streptococcus spp.About half(53%)of the BSIs were of unknown origin.Multivariate analysis demonstrated that young age(≤1.3 year;OR=2.1,P=0.011),growth failure(OR=2.1,P=0.045),liver support system(OR=4.2,P=0.008),and hospital stay of>44 d(OR=2.3,P=0.002)were independently associated with BSI in the year after LT.CONCLUSION BSI was frequently observed in patients after pediatric LT,affecting survival outcomes.The profile of BSI may inform clinical treatment and management in high-risk children after LT.

关键词： Bloodstream infection Liver transplantation Children Pathogens

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A brief review of alternative propellants and requirements for pulsed plasma thrusters in micropropulsion applications

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Chinese Journal of Aeronautics 2020年第12期33卷 2999-3010页

作者： William yeong Liang LING song ZHANG Hao FU Mengcheng HUANG Justin QUANSAH Xiangyang LIU Ningfei WANG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Technological miniaturization has enabled the development of small satellites weighing as little as 1 kg.Unfortunately,there is still a lack of suitable efficient micropropulsion systems at these scales.The pulsed plasma thruster is a structurally simple form of electric propulsion.This simplicity also makes it ideally suited for miniaturization.Its history can be traced back to applications in satellites that are much larger than micro/nano-satellites.The vast majority of modern pulsed plasma thrusters use solid polytetrafluoroethylene(PTFE)as a propellant.Unfortunately,at lower discharge energy levels such as those necessitated by the power limitations of micro/nano-satellites,PTFE has a tendency to exhibit carbon deposition,which can ultimately lead to thruster failure.In this new era of small satellites,it is important to consider alternative propellants in the miniaturization of pulsed plasma thrusters.This brief review discusses the needs and limitations of small satellites and alternative propellants that may be able to meet these needs.Such propellants may be able to offer advantages such as a longer thruster lifetime,a higher specific impulse,or a higher thrust-topower ratio.This would enable the development of different types of pulsed plasma thrusters that can be tailored towards specific mission requirements.

关键词： CubeSat Electric propulsion Micropropulsion Plasma physics Propellant Pulsed plasma thruster

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Improved Hybrid Beamforming for mmWave Multi-User Massive MIMO

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Computers, Materials & Continua 2021年第6期67卷 3057-3070页

作者： Ji-Sung Jung Won-Seok Lee yeong-Rong Lee Jaeho Kim Hyoung-Kyu song Department of Information and Communication Engineering and Convergence Engineering for Intelligent Drone Sejong UniversitySeoul05006Korea Department of Electrical Engineering Sejong UniversitySeoul05006Korea

Massive multiple input multiple output(MIMO)has become essential for the increase of capacity as the millimeter-wave(mmWave)communication is considered.Also,hybrid beamforming systems have been studied since full-digital beamforming is impractical due to high cost and power consumption of the radio frequency(RF)chains.This paper proposes a hybrid beamforming scheme to improve the spectral efciency for multi-user MIMO(MU-MIMO)systems.In a frequency selective fading environment,hybrid beamforming schemes suffer from performance degradation since the analog precoder performs the same precoding for all subcarriers.To mitigate performance degradation,this paper uses the average channel covariance matrix for all subcarriers and considers an iterative algorithm to design analog precoder using approximation techniques.The analog precoder is iteratively updated for each column until it converges.The proposed scheme can reduce errors in the approximating process of the overall spectral efciency.This scheme can be applied to fully-connected and partially-connected structures.The simulation results show that spectral efciency performance for the proposed scheme is better than the conventional schemes.The proposed scheme can achieve similar performance with full-digital beamforming by using a sufciently large number of RF chains.Also,this paper shows that the proposed scheme outperforms other schemes in the frequency selective fading environment.This performance improvement can be achieved in both structures.

关键词： Hybrid precoding massive MIMO MU-MIMO mmwave frequency selective fading

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Candida albicans aspects of binary titanium alloys for biomedical applications

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Regenerative Biomaterials 2020年第2期7卷 213-220页

作者： Shuyang Chen James K.H.Tsoi Peter C.S.Tsang yeong-Joon Park Ho-Jun song Jukka P.Matinlinna Dental Materials Science Division of Applied Oral Sciences&Community Dental CareFaculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China Department of Prosthodontics Tianjin Stomatological HospitalNo.75Dagu RoadHeping DistrictTianjin 300041People’s Republic of China Division of Restorative Dental Sciences Faculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China and 4 Department of Dental Materials and MRC for Hard-tissue Biointerface School of DentistryChonnam National UniversityGwangju 61186Republic of Korea

Titanium and its alloys are widely used in biomedical devices,e.***.implants,due to its biocompati-bility and osseointegration ability.In fact,fungal(Candida spp.)infection has been identified as one of the key reasons causing the failure of the device that is inevitable and impactful to the society.Thus,this study evaluated the surface morphology,surface chemical composition and Candida albicans adhesion on specimens of 16 binary Tialloys(-5 wt%of any one of the alloy elements:Ag,AI,Au,Co,Cr,Cu,Fe,In,Mn,Mo,Nb,Pd,Pt,Sn,V and Zr)compared with cp-Ti,targeting to seek for the binary Ti-alloys which has the lowest C.albicans infection.Candida albicans cultures were grown on the specimens for 48 h,and colony forming units(CFUs)and real-time polymerase chain reaction(RT-PCR)were used to evaluate the biofilm formation ability.Scanning electron mi-croscopy and confocal laser scanning microscopy confirmed the formation of C.albicans biofilm on all specimens'surfaces,such that CFU results showed Ti-Mo,Ti-Zr,Ti-AI and Ti-V have less C.albicans formed on the surfaces than cp-Ti.RT-PCR showed Ti-Zr and Ti-Cu have significantly higher C.albicans DNA concentrations than Ti-AI and Ti-V(P<0.05),whereas Ti-Cu has even showed a statistically higher concentration than Ti-Au,Ti-Co,Ti-In and Ti-Pt(P<0.05).This study confirmed that Ti-Mo,Ti-Zr,Ti-AI and Ti-V have lower the occurrence of C.albicans which might be clinically advantageous for medical devices,but Ti-Cu should be used in caution.

关键词： titanium binary titanium alloy C.albicans,fungal infection medical devices

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