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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 *** 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 ***,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 *** 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 *** 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 *** 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 *** 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 *** 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 ***,owing to bending instability that occurs during the electrospinning process,electrospinning has frequently produced a non-uniform-thickness nanofiber filter,which deteriorates its air ***,an adaptive electrospinning system based on reinforcement learning(E-RL)was developed to produce uniform-thickness nanofiber *** 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 *** 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)*** 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 *** the training process with the simulation software,the trained model was transferred to the adaptive electrospinning *** 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 *** 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 *** original article has been ***'s Note Springer Natu... 详细信息

关键词： Uniform neutral corrected

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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 *** wearable technology thus far has achieved the ability to maintain homeostasis by continuously monitoring physiological *** quality of life improves if,through further developments of wearable devices to detect,announce,and even control unperceptive or noxious signals from the *** materials based on photonic engineering can fulfil the abovementioned *** to the flexibility and zero-power operation of such materials,they can be applied to conventional wearables without affecting existing *** 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 ***,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 ***,issues emerging with the evolution of the wearable technology,such as Joule heating,battery durability,and user privacy,and the potential solution strategies are *** 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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A study on dynamic group signature scheme with threshold traceability for blockchain

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High-Confidence Computing 2024年第2期4卷 73-81页

作者： Hyo-jin song Teahoon Kim Yong-Woon Hwang Daehee Seo Im-yeong Lee Department of Software Convergence Soonchunhyang UniversityAsan 31538Republic of Korea Faculty of Artificial Intelligence and Data Engineering Sangmyung UniversitySeoul 03016Republic of Korea Department of Computer Software Engineering Soonchunhyang UniversityAsan 31538Republic of Korea

Blockchain technology provides transparency and reliability by sharing transactions and maintaining the same information through consensus among all ***,single-signature applications in transactions can lead to user identification issues due to the reuse of public *** address this issue,group signatures can be used,where the same group public key is used to verify signatures from group members to provide anonymity to ***,in dynamic groups where membership may change,an attack can occur where a user who has left the group can disguise themselves as a group member by leaking a partial *** problem cannot be traced back to the partial key *** this paper,we propose assigning different partial keys to group members to trace partial key leakers and partially alleviate the damage caused by partial key *** schemes have shown that arbitrary tracing issues occurred when a single administrator had exclusive key generation and tracing *** paper proposes a group signature scheme that solves the synchronization problem by involving a threshold number of TMs while preventing arbitrary tracing by distributing authority among multiple TMs.

关键词： Blockchain Group signature Privacy Anonymity Traceability

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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 *** capacity can be effectively increased by appropriately setting the phase value of IRS elements according to the channel ***,the problem of obtaining an appropriate phase value of IRs is difficult to solve due to the non-convex *** paper proposes an iterative algorithm for the alternating optimal solution in the Single User Multiple-Input-Multiple-Output(SU-MIMO)*** proposed iterative algorithm finds an alternating optimal solution that is the phase value of IRS one by *** results show that the proposed method has better performance than that of the randomized IRS *** 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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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 ***,there is still a lack of suitable efficient micropropulsion systems at these *** pulsed plasma thruster is a structurally simple form of electric *** simplicity also makes it ideally suited for *** history can be traced back to applications in satellites that are much larger than micro/*** vast majority of modern pulsed plasma thrusters use solid polytetrafluoroethylene(PTFE)as a ***,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 *** this new era of small satellites,it is important to consider alternative propellants in the miniaturization of pulsed plasma *** brief review discusses the needs and limitations of small satellites and alternative propellants that may be able to meet these *** propellants may be able to offer advantages such as a longer thruster lifetime,a higher specific impulse,or a higher thrust-topower *** 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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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 ***-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 *** a result,high interface impedance and motion artifacts can occur during body *** LIG to flexible substrates such as polydimethylsiloxane(PDMS)and Ecoflex allows for stretchability and ***,the transfer process produces a significant loss of conductivity destroying the structural function and electron conduction properties of the *** 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 *** embedded LIG onto SEBS to obtain high stretchability,high flexibility,low conductivity *** deposition(EPD)of poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid(PEDOT:PSS)on LIG forms an ultrathin polymer conductive *** deposition thickness of the conductive polymer is adjusted by controlling the EPD deposition time to achieve optimal conductivity and chemical ***/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 ***,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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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 ***,hybrid beamforming systems have been studied since full-digital beamforming is impractical due to high cost and power consumption of the radio frequency(RF)*** paper proposes a hybrid beamforming scheme to improve the spectral efciency for multi-user MIMO(MU-MIMO)*** a frequency selective fading environment,hybrid beamforming schemes suffer from performance degradation since the analog precoder performs the same precoding for all *** 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 *** analog precoder is iteratively updated for each column until it *** proposed scheme can reduce errors in the approximating process of the overall spectral *** scheme can be applied to fully-connected and partially-connected *** simulation results show that spectral efciency performance for the proposed scheme is better than the conventional *** proposed scheme can achieve similar performance with full-digital beamforming by using a sufciently large number of RF ***,this paper shows that the proposed scheme outperforms other schemes in the frequency selective fading *** 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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Expanding the scope of application of user innovation theorydA case study of the civil-military integration project in China

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International Journal of Innovation Studies 2018年第1期2卷 33-41页

作者： Jhony Choon yeong Ng Karen Kai Wen song Qingmei Tan College of Economics and Management Office 914Nanjing University of Aeronautics and AstronauticsJiangning DistrictNanjing 211106JiangsuChina

The focus of scholars studying user innovation has been restricted to the interaction between companies and individual users,and how companies can unilaterally exploit values from the value chain between companies and *** argue that the value chain between the user and manufacturer should be a bilateral value chain in which both the user and manufacturer can conduct their own innovations and provide greater value to the whole value *** this paper,using examples from China's civil-military integration project,we took a step forward to apply the user innovation theory in the explanation of inter-sector technological value *** main theoretical contribution of this paper is the expansion of the scope of application of the user innovation theory to inter-sector level *** cases from China's civil-military integration project,we found that the concepts of user and innovator become blurred when we study the phenomenon across *** we go beyond individual user and manufacturer and shift the focus of our discussion to the level of inter-sector technological value transfer,we will find that it is possible for organizational agents at large to be both users and innovators of technology.

关键词： User innovation Civil-military integration Technological value chain Military sector Civil sector

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