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Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach

Nano Research 2017年第9期10卷 3077-3091页

作者： Zhenxing Yin Seung Keun Song Sanghun Cho Duck-Jae You Jeeyoung Yoo Suk Tai Chang Youn Sang kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 08826 Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University Seou106974 Republic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-ro Yeongtong-gu Suwon-si Gyeonggi-do 16229 Republic of Korea

Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (R s = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R 0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (R rms = 14.36 nm).

关键词： curved Cu nanowires all-solution processes 20 μm patterns high performance transparent electrode

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Estimating the instantaneous reproduction number(R_(t))by using particle filter

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Infectious Disease Modelling 2023年第4期8卷 1002-1014页

作者： Yong Sul Won Woo-Sik Son Sunhwa Choi Jong-Hoon kim National Institute for Mathematical Sciences DaejeonSouth Korea International Vaccine Institute SeoulSouth Korea

Background:Monitoring the transmission of coronavirus disease 2019(COVID-19)requires accurate estimation of the effective reproduction number(Rt).However,existing methods for calculating Rt may yield biased estimates if important real-world factors,such as delays in confirmation,pre-symptomatic transmissions,or imperfect data observation,are not ***:To include real-world factors,we expanded the susceptible-exposed-infectiousrecovered(SEIR)model by incorporating pre-symptomatic(P)and asymptomatic(A)states,creating the SEPIAR *** utilizing both stochastic and deterministic versions of the model,and incorporating predetermined time series of Rt,we generated simulated datasets that simulate real-world challenges in estimating *** then compared the performance of our proposed particle filtering method for estimating Rt with the existing EpiEstim approach based on renewal ***:The particle filtering method accurately estimated Rt even in the presence of data with delays,pre-symptomatic transmission,and imperfect *** evaluating via the root mean square error(RMSE)metric,the performance of the particle filtering method was better in general and was comparable to the EpiEstim approach if perfectly deconvolved infection time series were provided,and substantially better when Rt exhibited short-term fluctuations and the data was right ***:The SEPIAR model,in conjunction with the particle filtering method,offers a reliable tool for predicting the transmission trend of COVID-19 and assessing the impact of intervention *** approach enables enhanced monitoring of COVID-19 transmission and can inform public health policies aimed at controlling the spread of the disease.

关键词： Particle filter Sequential Monte Carlo Effective reproduction number COVID-19 Transmission model Compartment model

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Effects of flow velocity on electrochemical behavior of seachest 5083-H116 Al alloy for ship

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Transactions of Nonferrous Metals Society of China 2011年第8期21卷 1703-1709页

作者： Seung-Jun LEE Seong-Jong kim Division of Marine Engineering Mokpo Maritime University

Electrochemical behavior of 5083-H116 Al alloy with flow velocity of seachest material for Al ship was *** examine the electrochemical characteristics of flow velocity and its effects on the performance of the alloy,experiments were conducted at four flow velocity variables using static state with an *** ultrasonic vibration generator using piezoelectric effect was used in cavitation test according to the requirements of in *** results show that the corrosion current density and damage were increased by applying the flow velocity compared to static ***,it is determined that the case of applying flow velocity is weaker to the corrosion.

关键词： aluminium ships over-protection marine growth prevention system sea-chest flow velocity

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Design of 32 kbit one-time programmable memory for microcontroller units

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Journal of Central South University 2012年第12期19卷 3475-3483页

作者： JEON Hwang-gon CHOI In-hwa HA Pan-bong kim Young-hee Department of Electronic Engineering Changwon National University9 Sarim-DongChangwon 641-773Korea

A 32 kbit OTP(one-time programmable)memory for MCUs(micro-controller units)used in remote controllers was *** OTP memory is used for program and data *** is required to apply 5.5V to BL(bit-line)and 11V to WL(word-line)for a OTP cell of 0.35μm ETOX(EEPROM tunnel oxide)type by *** use 5V transistors on column data paths to reduce the area of column data paths since they require small *** addition,we secure device reliability by using HV(high-voltage)transistors in the WL ***,we change from a static logic to a dynamic logic used for the WL driver in the core ***,we optimize the WD(write data)switch ***,we can implement them with a small-area *** addition,we implement the address predecoder with a small-area logic *** area of the designed 32 kbit OTP with 5V and HV devices is 674.725μm×258.75μm(=0.1745mm2)and is 56.3% smaller than that using 3.3V devices.

关键词： one-time programmable memory micro controller unit EEPROM tunnel oxide small-area

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Mimicking a Superhydrophobic Insect Wing by Argon and Oxygen Ion Beam Treatment on Polytetrafluoroethylene Film

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Journal of Bionic Engineering 2009年第4期6卷 365-370页

作者： Youngjong Lee Yonghoon Yoo Jihoon kim Sriyulianti Widhiarini Baeho Park Hoon Cheol Park Kwang Joon Yoon Doyoung Byun Department of Aerospace Information Engineering Konkuk UniversitySeoul 143-701Republic of Korea Department of Physics Konkuk UniversitySeoul 143-701Republic of Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Republic of Korea

Biological tiny structures have been observed on many kinds of surfaces such as lotus leaves and insect wings,which enhance the hydrophobicity of the natural surfaces and play a role of *** presented the fabrication technology of a superhydrophobic surface using high energy ion *** insect wings that mimic the morphology and the superhydrophobocity of cicada's wings were successfully fabricated using argon and oxygen ion beam treatment on a polytetrafluoroethylene (PTFE)*** wing structures were supported by carbon/epoxy fibers as artificial flexible veins that were bonded through an autoclave *** morphology of the fabricated surface bears a strong resemblance to the wing surface of a cicada,with contact angles greater than 160°,which could be sustained for more than two months.

关键词： superhydrophobic insect wing mimicry of the wing ion beam treatment artificial flapper dynamic contact angle

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Hemodynamic instability following intravenous dexmedetomidine infusion for sedation under brachial plexus block: Two case reports

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World Journal of Clinical Cases 2023年第30期11卷 7469-7474页

作者： Ye Sull kim Chanhong Lee Jeongmin Oh Seonhwa Nam A Ram Doo Department of Anesthesiology and Pain Medicine Jeonbuk National University HospitalJeonju 54907South Korea Department of Anesthesiology and Pain Medicine Jeonbuk National University Medical School and HospitalJeonju 54907South Korea Department of Anesthesiology and Pain Medicine Research Institute of Clinical Medicine-Biomedical Research Institute of Jeonbuk National University HospitalJeonju 54907South Korea

BACKGROUND Dexmedetomidine(DMED)is frequently used as a sedative in several medical *** benefits of DMED include enhanced quality of regional anesthesia,prolonged analgesia,and postoperative opioid-sparing when administered intravenously or perineurally in combination with regional *** hemodynamic complications,such as profound bradycardia and hypotension,can occur after DMED administration in critically ill patients or overdosage;however,there are few reports of complications with DMED administration following brachial plexus block(BPB).CASE SUMMARY We present two cases of hemodynamic instability that occurred following the initial loading of DMED under supraclavicular BPB.A healthy 29-year-old man without any medical history showed profound bradycardia after receiving a loading dose of DMED 0.9μg/kg for 9 *** administration was promptly stopped,and after receiving a second dose of atropine,the heart rate recovered.A 62-year-old woman with a history of cardiomyopathy became hypotensive abruptly,requiring the administration of inotrope and vasopressors after receiving a reduced loading dose of 0.5μg/kg for 10 *** of the recommended loading dose of DMED was administered due to the underlying heart ***-sed blood pressure was maintained despite the intravenous administration of *** continuous infusion of dopamine and norepinephrine,the vital signs were maintained within normal *** and vasopressor support was required for over 6 h after the initial loading dose of *** DMED administration following BPB could trigger hemodynamic instability in patients with decreased cardiac function as well as in healthy individuals.

关键词： Dexmedetomidine Brachial plexus block Profound bradycardia Complication Hypotension Instability Case report

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不同茶树品种的茶树花黄酮苷研究

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浙江大学学报（农业与生命科学版） 2019年第6期45卷 707-714页

作者：李金陈莲芙金恩惠李博屠幼英浙江大学农业与生物技术学院茶学系

利用超高效液相色谱-质谱联用(ultra-high performance liquid chromatography-mass spectrometry,UHPLCMS)技术检测出梅占、水古、黄叶早、政和大白、福建水仙5个不同茶树品种茶树花的12种黄酮苷,分别为杨梅素-3-O-芸香糖苷、杨梅素-3... 详细信息

利用超高效液相色谱-质谱联用(ultra-high performance liquid chromatography-mass spectrometry,UHPLCMS)技术检测出梅占、水古、黄叶早、政和大白、福建水仙5个不同茶树品种茶树花的12种黄酮苷,分别为杨梅素-3-O-芸香糖苷、杨梅素-3-O-半乳糖苷、杨梅素-3-O-葡萄糖苷、槲皮素-3-O-芸香糖半乳糖苷、槲皮素-3-O-芸香糖葡萄糖苷、山柰酚-3-O-芸香糖半乳糖苷、槲皮素-3-O-半乳糖苷、槲皮素-3-O-葡萄糖苷、山柰酚-3-O-芸香糖葡萄糖苷、山柰酚-3-O-半乳糖苷、山柰酚-3-O-芸香糖苷、山柰酚-3-O-葡萄糖苷。通过比较不同品种间各黄酮苷的含量,发现茶树花中含量最高的2种黄酮苷为山柰酚-3-O-芸香糖葡萄糖苷和山柰酚-3-O-芸香糖半乳糖苷,梅占茶树花中山柰酚-3-O-芸香糖葡萄糖苷与黄叶早茶树花中山柰酚-3-O-芸香糖半乳糖苷的质量分数分别为1.208 mg/g和0.962 mg/g,显著高于其他品种;政和大白、黄叶早和水古茶品种茶树花中槲皮素-3-O-芸香糖半乳糖苷的含量显著高于其他品种。在5个茶树品种中,福建水仙品种茶树花中槲皮素-3-O-芸香糖葡萄糖苷的含量最高,且显著高于政和大白、梅占和黄叶早;福建水仙茶树花中的杨梅素-3-O-葡萄糖苷含量比其他品种中的高出近4倍,而其杨梅素-3-O-半乳糖苷的含量只有其他品种的20%左右;政和大白茶树花的黄酮苷总量在5个品种中最低。尽管各茶树花黄酮苷组分在不同品种中的含量呈现明显的差异性,但在所有品种的茶树花中均表现为其山柰酚苷含量>槲皮素苷含量>杨梅素苷含量,且主要以三糖基黄酮苷的形式存在。

关键词：茶树花黄酮苷超高效液相色谱-质谱联用茶树品种

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Zero-static-power nonvolatile logic-in-memory circuits for flexible electronics

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Nano Research 2017年第7期10卷 2459-2470页

作者： Byung ChulJang Sang Yoon Yang Hyejeong seong Sung Kyu kim Junhwan Choi Sung Gap Im Sung-Yool Choi School of Electrical Engineering Graphene/2D Materials Research Center Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Department of Chemical and Biomolecular Engineering Graphene/2D Materials Research Center Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea

Flexible logic circuits and memory with ultra-low static power consumption are in great demand for battery-powered flexible electronic systems. Here, we show that a flexible nonvolatile logic-in-memory circuit enabling normally-off computing can be implemented using a poly（1,3,5-trivinyl-l,3,5-trimethyl cyclotrisiloxane）（pV3D3）-based memristor array. Although memristive logic-in-memory circuits have been previously reported, the requirements of additional components and the large variation of memristors have limited demonstrations to simple gates within a few operation cycles on rigid substrates only. Using memristor-aided logic （MAGIC） architecture requiring only memristors and pV3D3-memristor with good uniformity on a flexible substrate, for the first time, we experimentally demonstrated our implementation of MAGIC-NOT and -NOR gates during multiple cycles and even under bent conditions. Other functions, such as OR, AND, NAND, and a half adder, are also realized by combinations of NOT and NOR gates within a crossbar array. This research advances the development of novel computing architecture with zero static power consumption for battery- powered flexible electronic systems.

关键词： memristor memristive logic circuit flexible nonvolatilelogic-in-memory circuit normally-off computing memristor-aided logic(MAGIC) architecture

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An Economic Model of the Wartime Economy： An Application to a Possible Sino-Japanese Conflict

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Fudan Journal of the Humanities and Social Sciences 2016年第3期9卷 425-447页

作者： Mario Arturo Ruiz Estrada Donghyun Park Jung Suk kim Department of Economics Faculty of Economics and Administration University of Malaya50603 Kuala Lumpur Malaysia Asian Development Bank (ADB) 6 ADB Avenue Mandaluyong City 1550 Metro ManilaPhilippines Institute of International and Area Studies Sogang University Seoul Korea

This paper introduces a new economic model of a wartime economy, the war economic capability model--WEC-Model. The WEC-Model assesses the eco- nornic impact of an armed conflict in three different stages：（1） initial armed conflict and diplomatic negotiations; （2） military armed conflict; and （3） winners and losers in the post-armed conflict stage. The analysis makes use of new indicators such as economic desgrowth （-δ）, armed conflict intensity （αi）, armed conflict losses （-π）, economic wear （Л）, level of armed conflict tension （ζ）, level of diplomatic nego- tiations （η）, and total economic leaking （Ωt. To illustrate the model, we apply it to evaluate an imaginary armed conflict between the People＇s Republic of China and Japan.

关键词： Armed conflict War Economic modeling Economic desgrowth

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High-performance and Multi-functional Control of Transformerless Single-phase Smart Inverter for Grid-connected PV System

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1386-1394页

作者： Kamran Zeb Saif Ul Islam Waqar Uddin Imran Khan Muhammad Ishfaq Tiago Davi Curi Busarello H.J.kim Department of Electrical Engineering Pusan National University School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of Control Automation and Computing EngineeringFederal University of Santa Catarina Blumenau

Highly reliable and flexible control is required for distributed generation(DG) to efficiently connect to the *** inverters play a key role in the control and integration of DG into the power grid and provide advanced functionalities. In this paper, an energy-based single-phase voltage-source smart inverter(SPV-SSI) of 5 k VA is designed and analyzed in detail. SPV-SSI is capable of supplying the power to local load and the utility load up to the rated capacity of the inverter, injecting the power into the grid, storing the energy in lead-acid battery bank, controlling the voltage at the point of common coupling(PCC) during voltage sags or faults, and making decisions on real-time pricing information obtained from the utility grid through advanced metering. The complete design of smart inverter in dq frame, bi-directional DC-DC buck-boost converter, IEEE standard 1547 based islanding and recloser, and static synchronous compensator(STATCOM) functionalities is presented in this paper. Moreover, adaptive controllers, i. e., fuzzy proportional-integral(F-PI) controller and fuzzy-sliding mode controller(F-SMC) are designed. The performances of F-PI controller and F-SMC are superior, stable, and robust compared with those of conventionally tuned PI controllers for voltage control loop(islanded mode) and current control loop(grid-connected mode).

关键词： Distributed generation(DG) inverter convert-er fuzzy-sliding mode controller(F-SMC) fuzzy proportionalintegral(F-PI)controller

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