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Two-Terminal Lithium-Mediated Artificial Synapses with Enhanced Weight Modulation for Feasible Hardware Neural Networks

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Nano-Micro Letters 2023年第5期15卷 236-253页

作者： Ji Hyun Baek Kyung Ju Kwak Seung Ju Kim Jaehyun Kim Jae Young Kim in hyuk im Sunyoung Lee Kisuk Kang Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Recently,artificial synapses involving an electrochemical reaction of Li-ion have been attributed to have remarkable synaptic ***-terminal synaptic transistors utilizing Li-ion intercalation exhibits reliable synaptic characteristics by exploiting the advantage of nondistributed weight updates owing to stable ion ***,the three-terminal configurations with large and complex structures impede the crossbar array implementation required for hardware neuromorphic ***,achieving adequate synaptic performances through effective Li-ion intercalation in vertical two-terminal synaptic devices for array integration remains ***,two-terminal Au/LixCoO_(2)/Pt artificial synapses are proposed with the potential for practical implementation of hardware neural *** Au/LixCoO_(2)/Pt devices demonstrated extraordinary neuromorphic behaviors based on a progressive dearth of Li in LixCoO_(2)*** intercalation and deintercalation of Li-ion inside the films are precisely controlled over the weight control spike,resulting in improved weight control *** types of synaptic plasticity were imitated and assessed in terms of key factors such as nonlinearity,symmetricity,and dynamic ***,the LixCoO_(2)-based neuromorphic system outperformed three-terminal synaptic transistors in simulations of convolutional neural networks and multilayer perceptrons due to the high linearity and low programming *** impressive performances suggest the vertical two-terminal Au/LixCoO_(2)/Pt artificial synapses as promising candidates for hardware neural networks.

关键词： Artificial synapse Neuromorphic Li-based Two-terminal Synaptic plasticity

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Advances in carbon-based thermoelectric materials for high-performance,flexible thermoelectric devices

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Carbon Energy 2021年第5期3卷 667-708页

作者： Jeong-Seob Yun Seongyun Choi Sang hyuk im Department of Chemical and Biological Engineering Korea UniversitySeongbuk-guSeoulRepublic of Korea

Waste energy harvesting can contribute to the increase of the efficiency of many industrial processes,which consume energy to produce valuable *** all the wasted energy,heat energy is the most abundant,existing in almost any *** devices have the capability to harvest and convert the thermal energy into electrical power via the Seebeck *** its simple operating principle,thermoelectric devices can be reliable even under the harshest environments,taking advantage of any type of heat *** a result,various inorganic and organic materials are being explored as thermoelectric *** the reported materials,carbon-based materials are promising in terms of commericialization,due to their nontoxic and abundant nature,and solution *** particular,poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS),carbon nanotubes,and graphene are extensively studied as thermoelectric materials owing to their remarkable thermoelectric ***,organic-inorganic hybrid halide perovskites show the potential to be used as future high-performance thermoelectric ***,the progess in carbon materials as thermoelectrics is reviewed in detail,focusing on four base materials(PEDOT:PSS,carbon nanotubes,graphene,and organic-inorganic hybrid halide perovskites).This review illuminates the potential of carbon-based materials in the field of thermoelectrics and their application to next-generation energy devices.

关键词： carbon materials carbon nanotubes graphene halide perovskites PEDOT:PSS thermoelectrics

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A facile one-step approach to hierarchically assembled core-shell-like MnO2@MnO2 nanoarchitectures on carbon fibers： An efficient and flexible electrode material to enhance energy storage

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Nano Research 2016年第5期9卷 1507-1522页

作者： Goli Nagaraju Yeong Hwan Ko Sung Min Cha Sang hyuk im Jae Su Yu Department of Electronics and Radio Engineering Institute for Wearable Convergence Electronics Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701 Republic of Korea Functional Crystallization Center (ERC) Department of Chemical Engineering Kyung Hee University 1732 Deogyeong-daeroGiheuncl-qu Yonqin-si Gyeonqqi-do 446-701 Republic of Korea

Hierarchical core-shell-like MnO2 nanostructures （NSs） were used to anchor MnO2 hexagonal nanoplate arrays （HNPAs） on carbon cloth （CC） fibers. The NSs were prepared by a novel one-step electrochemical deposition method. Under an external cathodic voltage of -2.0 V for 30 min, hierarchical core-shell-like MnO2-NS-decorated MnO2 HNPAs （MnO2 NSs@MnO2 HNPAs） were uniformly grown on CC with reliable adhesion. The phase purity and morphological properties of the samples were characterized by various physicochemical techniques. At a constant external cathodic voltage, growth of MnO2 NSs@MnO2 HNPAs on CC was carried for different time periods. When utilized as a flexible, robust, and binder-free electrode for pseudocapacitors, the hierarchical core-shell-like MnO2 NSs@MnO2 HNPAs on CC showed clearly enhanced electrochemical properties in 1 M Na2SO4 electrolyte solution. The results indicate that the MnO2 NSs@MnO2 HNPAs on CC have a maximum specific capacitance of 244.54 F/g at a current density of 0.5 A/g with excellent cycling stability compared to that of bare MnO2 HNPAs on CC （112.1 F/g at 0.5 A/g current density）. We believe that the superior charge storage performance of the pseudocapacitive electrode can be mainly attributed to the hierarchical MnO2 NSs@MnO2 HNPAs building blocks that have a large specific surface area, offering additional electroactive sites for efficient electrochemical reactions. The facile and single-step approach to growth of hierarchical pseudocapacitive materials on textile based electrodes opens up the possibility for the fabrication of high-performance flexible energy storage devices.

关键词： manganese oxide hierarchical structures carbon cloth electrochemical deposition energy storage properties

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Direct Synthesis of Molybdenum Phosphide Nanorods on Silicon Using Graphene at the Heterointerface for Efficient Photoelectrochemical Water Reduction

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Nano-Micro Letters 2021年第5期13卷 135-150页

作者： Sang Eon Jun Seokhoon Choi Shinyoung Choi Tae Hyung Lee Changyeon Kim Jin Wook Yang Woon‑Oh Choe In‑hyuk im Cheol‑Joo Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea

Transition metal phosphides(TMPs)and transition metal dichalcogenides(TMDs)have been widely investigated as photoelectrochemical(PEC)catalysts for hydrogen evolution reaction(HER).Using high-temperature processes to get crystallized compounds with large-area uniformity,it is still challenging to directly synthesize these catalysts on silicon photocathodes due to chemical incompatibility at the ***,a graphene interlayer is applied between p-Si and MoP nanorods to enable fully engineered interfaces without forming a metallic secondary compound that absorbs a parasitic light and provides an inefficient electron path for hydrogen ***,the graphene facilitates the photogenerated electrons to rapidly transfer by creating Mo-O-C covalent bondings and energetically favorable band *** a bridging role of graphene,numerous active sites and anti-reflectance of MoP nanorods lead to significantly improved PEC-HER performance with a high photocurrent density of 21.8 mA cm−2 at 0 V versus RHE and high ***,low dependence on pH and temperature is observed with MoP nanorods incorporated photocathodes,which is desirable for practical use as a part of PEC *** results indicate that the direct synthesis of TMPs and TMDs enabled by graphene interlayer is a new promising way to fabricate Si-based photocathodes with high-quality interfaces and superior HER performance.

关键词： Photoelectrochemical water splitting Silicon Molybdenum phosphide Hydrogen evolution Graphene

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Transmural penetration of sigmoid colon and rectum by retained surgical sponge after hysterectomy

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World Journal of Gastroenterology 2016年第10期22卷 3052-3055页

作者： Woo Young Shin Chan hyuk im Sun Keun Choi Yun-Mee Choe Kyung Rae Kim Department of Surgery Inha University HospitalInha University College of Medicine

Gossypiboma is a surgical sponge that is retained in the body after the operation. A 39-year-old female presented with vague lower abdominal pain, fever, and rectal discharge 15 mo after hysterectomy. The sponge remaining in the abdomen had no radiopaque marker. Therefore a series of radiographic evaluations was fruitless. The surgical sponge was found in the rectosigmoid colon on colonoscopy. The sponge penetrated the sigmoid colon and rectum transmurally, forming an opening on both sides. The patient underwent low anterior resection and was discharged without postoperative complications.

关键词： Gossypiboma Textiloma Retained foreign object Surgical sponge Radiopaque marker

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Key-Value Store Coupled with an Operating System for Storing Large-Scale Values

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Computers, Materials & Continua 2022年第11期73卷 3333-3350页

作者： Jeonghwan im hyuk-Yoon Kwon Graduate School of Data Science Seoul National University of Science and TechnologySeoulKorea Department of Industrial Engineering Graduate School of Data ScienceResearch Center for Electrical and Information ScienceSeoul National University of Science and TechnologySeoulKorea

The key-value store can provide flexibility of data types because it does not need to specify the data types to be stored in advance and can store any types of data as the value of the key-value *** types of studies have been conducted to improve the performance of the key-value store while maintaining its ***,the research efforts storing the large-scale values such as multimedia data files(e.g.,images or videos)in the key-value store were *** this study,we propose a new key-value store,WR-Store++aiming to store the large-scale values ***,it provides a new design of separating data and index by working with the built-in data structure of the Windows operating system and the file *** utilization of the built-in data structure of the Windows operating system achieves the efficiency of the key-value store and that of the file system extends the limited space of the storage *** also present chunk-based memory management and parallel processing of WR-Store++to further improve its performance in the GET *** the experiments,we show that WR-Store++can store at least 32.74 times larger datasets than the existing baseline key-value store,WR-Store,which has the limitation in storing large-scale data ***,in terms of processing efficiency,we show that WR-Store++outperforms not only WR-Store but also the other state-ofthe-art key-value stores,LevelDB,RocksDB,and BerkeleyDB,for individual key-value operations and mixed workloads.

关键词： Key-value stores large-scale values chunk-based memory management parallel processing

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一种二氧化钛溶胶以及包含该二氧化钛溶胶涂层的制备方法

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现代涂料与涂装 2019年第8期 71-71页

作者： Sang-hyuk im Seung-Heon Lee Young-Jun Hong 王志强

本发明涉及了一种二氧化钛溶胶及其制备方法,以及包含二氧化钛溶胶涂层材料的制备,该二氧化钛溶胶作为高折射填料制备透明涂层,主要用于高透明玻璃、工业安全玻璃、休闲护目镜等透明件。二氧化钛在金属氧化物中具有较大的折射率,具有很... 详细信息

本发明涉及了一种二氧化钛溶胶及其制备方法,以及包含二氧化钛溶胶涂层材料的制备,该二氧化钛溶胶作为高折射填料制备透明涂层,主要用于高透明玻璃、工业安全玻璃、休闲护目镜等透明件。二氧化钛在金属氧化物中具有较大的折射率,具有很好的白度和着色力,因此被广泛应用于电子、油漆、油墨、塑料、纸张、橡胶和纤维制造等领域。二氧化钛的晶体形态分为锐钛矿和金红石。锐钛矿和金红石由于晶体结构的不同,其折射率也不同,金红石型二氧化钛的折射率为2.72,高于锐钛矿型二氧化钛的折射率(2.52),但是金红石型的二氧化钛很难制成纳米级粒子。目前已经公开的水分散二氧化钛溶胶可用于涂层,但固体含量太小,不能用作高折射硬涂层的填料。如果提高了其固体含量则会出现颗粒聚集和颗粒增大的问题,影响二氧化钛溶胶在透明涂层中的

关键词：二氧化钛溶胶制备方法

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The brain activation pattern of the medial temporal lobe during chewing gum: a functional MRI study

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Neural Regeneration Research 2017年第5期12卷 812-814页

作者： Youn-Hee Choi Woo hyuk Jang Sang-Uk im Keun-Bae Song Hee-Kyung Lee Han Do Lee You Sung Seo Sung Ho Jang Department of Preventive Dentistry School of Dentistry Kyungpook National University Department of Occupational Therapy College of Health Science Kangwon National University Departments of Physical Medicine and Rehabilitation College of Medicine Yeungnam University

The human brain is known to be influenced by environmental stimuli（Feeney et al.,1982;Kaplan,1988）.Therefore,research on the brain activation pattern by external stimuli has been an important topic in neuroscience（Kaplan,1988）.Chewing gum has been known to have a positive effect on cognition,including alertness,attention,cognitive processing speed,

关键词： MRI The brain activation pattern of the medial temporal lobe during chewing gum a functional MRI study

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Inhibition of BET selectively eliminates undifferentiated pluripotent stem cells

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Science Bulletin 2018年第8期63卷 477-487页

作者： Jung Hyun im Seon In Hwang Jong-Wan Kim soon-Jung Park Kyu-ree Kang Jueng Soo You Kee Pyo Kim Sung-Hwan Moon hyuk-Jin Cha Hyung-Min Chung Hans R. Scholer Jung Keun Hyun DongWook Han Department of Stem Cell Biology School of Medicine Konkuk University Seoul 05029 Republic of Korea Department of Nanobiomedical Science Dankook University Graduate School Cheonan 330714 Republic of Korea Department of Biochemistry School of Medicine Konkuk University Seoul 05029 Republic of Korea Department of Cell and Developmental Biology Max Planck Institute for Molecular Biomedicine 48149 Munster Germany Department of Life Sciences College of Natural Sciences Sogang University Seoul 04107 Republic of Korea KU Open-lnnovation Center. Institute of Biomedical Science & Technology Konkuk University Seoul 05029 Republic of Korea Department of Advanced Translational Medicine School of Medicine Konkuk University Seoul 05029 Republic of Korea

Embryonic stem cells(ESCs) maintain their cellular identity through the systematic regulation of master transcription factors and chromatin remodeling complexes. Recent work has shown that the unusually large-scale enhancers—namely super-enhancers(SEs), on which BRD4, a member of the bromodomain and extraterminal domain(BET) family is highly enriched—could regulate pluripotency-related transcription factors. Moreover, inhibition of BRD4 binding on SEs has been shown to induce the differentiation of ESCs. However, the underlying mechanism of BRD4 inhibition-mediated stem cell differentiation remains elusive. Here we show that both mouse and human ESCs lose their capacity for self-renewal upon treatment with JQ1, a selective inhibitor of BET family including BRD4, with rapid suppression of pluripotency-associated genes. Notably, a high concentration of JQ1 could selectively eliminate ESCs via apoptosis, without affecting the functionality of differentiated somatic cells from ESCs, suggesting that inhibition of BET may have a beneficial effect on the development of pluripotent stem cell-based cell therapy.

关键词：干细胞 apoptosis 细胞治疗字符建筑群染色质约束力证明

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秦汉律的罚金刑

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湖南大学学报（社会科学版） 2008年第3期22卷 26-31页

作者：任仲[火赫][韩国] 朴美玉(翻译) 韩国淑明女子大学首尔140-742 北京青年政治学院

秦律的赀罚与二年律令的罚金虽然名称完全不同,但两者具有继承关系。秦律的赀二甲是对盗窃额未满110钱-22钱的处罚,赀一盾是对未满22钱-1钱的处罚。秦律的这些内容由二年律令继承。赀罚原来分为赀一盾、赀二盾、赀一甲、赀二甲等四个等... 详细信息

秦律的赀罚与二年律令的罚金虽然名称完全不同,但两者具有继承关系。秦律的赀二甲是对盗窃额未满110钱-22钱的处罚,赀一盾是对未满22钱-1钱的处罚。秦律的这些内容由二年律令继承。赀罚原来分为赀一盾、赀二盾、赀一甲、赀二甲等四个等级,后来赀二盾逐渐消失,形成赀一盾、赀一甲、赀二甲三个等级,这三个等级的比例为1:2:4,与二年律令的罚金一两、二两、四两的比例关系相一致。赀一盾的罚额为672钱,与罚金一两的价额625钱相差不大。赀一盾的价额672钱与秦律规定的日均劳动价额8钱有关,以一日劳役为八钱计算,672钱相当于服役84天的价额。汉代的罚金制度与赎刑重复,尚未形成完整的体系,直至晋律,才将汉代的罚金精简为五个等级。

关键词：罚金赀罚秦律等级二年律令

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