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Origami multi-layer space shield for cylindrical space structure

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Chinese Journal of Aeronautics 2024年第10期37卷 294-312页

作者： Ji-Hun CHA Ji-Sub NOH Sarath Kumar SATHISH KUMAR Dohyeon JIN dae-young lee Chun-Gon KIM Department of Aerospace Engineering Chosun UniversityGwangju 61452Republic of Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityGyeongsangnam-do 52828Republic of Korea Department of Aerospace Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Aerospace Engineering KAISTDaejeon 34141Republic of Korea

The multidisciplinary space environment,encompassing orbital debris,cosmic radiation,and solar radiative heat,poses significant risks to spacecraft and astronauts,necessitating efficient and effective shielding solutions.A multi-layer shield with wide spacing has been proven to be an effective way to shield the spacecraft from space debris impact;however,due to the limited volume of the payload fairing,it was not feasible to apply a multi-layer shield to the spacecraft *** the origami design,the shield maintains a compact form during launch and subsequently expands in outer space to enhance *** geometric analysis,it has been confirmed that the deployable multi-layer space shield can occupy less space than conventional space shield structures while expanding into wider shield intervals and multiple *** hypervelocity impact experiments,it was confirmed that as the bumper spacing of the multi-layer space shield expands,its ballistic performance becomes superior to conventional space *** deployable multi-layer space shield can reduce not only hypervelocity impacts but also solar radiative heat using the same mechanism as multi-layer *** cosmic radiation dose analysis,it has been confirmed that the multi-layer space shield is effective in cosmic radiation shielding compared to conventional space structures.

关键词： Hybrid composite Origami Hypervelocity impact Space environment Space debris Cosmic radiation

Whole-genome,transcriptome,and methylome analyses provide insights into the evolution of platycoside biosynthesis in Platycodon grandiflorus,a medicinal plant

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Horticulture Research 2020年第1期7卷 1536-1547页

作者： Jungeun Kim Sang-Ho Kang Sin-Gi Park Tae-Jin Yang Yi lee Ok Tae Kim Oksung Chung Jungho lee Jae-Pil Choi Soo-Jin Kwon Keunpyo lee Byoung-Ohg Ahn Dong Jin lee Seung-il Yoo In-Gang Shin Yurry Um dae young lee Geum-Soog Kim Chang Pyo Hong Jong Bhak Chang-Kug Kim Personal Genomics Institute Genome Research FoundationOsong 28160Korea Genomics Division National Institute of Agricultural Sciences(NAS)Jeonju 54874Korea Theragen Etex Bio Institute Suwon 16229Korea Department of Plant Science Plant Genomics and Breeding Instituteand Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea Department of Industrial Plant Science&Technology Chungbuk National UniversityCheongju 28644Korea Department of Herbal Crop Research National Institute of Horticultural and Herbal ScienceRural Development Administration(RDA)Eumseong 27709Korea Clinomics Inc Ulsan 44919Korea Green Plant Institute Yongin 16954Korea Korean Genomics Center(KOGIC) Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Biomedical Engineering School of Life SciencesUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea

Triterpenoid saponins(TSs)are common plant defense phytochemicals with potential pharmaceutical *** grandiflorus(Campanulaceae)has been traditionally used to treat bronchitis and asthma in East *** oleanane-type TSs,platycosides,are a major component of the *** root *** studies show that platycosides exhibit anti-inflammatory,antiobesity,anticancer,antiviral,and antiallergy ***,the evolutionary history of platycoside biosynthesis genes remains *** this study,we sequenced the genome of *** and investigated the genes involved in platycoside *** draft genome of *** is 680.1 Mb long and contains 40,017 protein-coding *** analysis revealed that the CYP716 family genes play a major role in platycoside *** CYP716 gene family of *** was much larger than that of other Asterid *** gene annotation also revealed the expansion ofβ-amyrin synthases(bASs)in ***,which was confirmed by tissue-specific gene *** these expanded gene families,we identified key genes showing preferential expression in roots and association with platycoside *** addition,wholegenome bisulfite sequencing showed that CYP716 and bAS genes are hypomethylated in ***,suggesting that epigenetic modification of these two gene families affects platycoside *** whole-genome,transcriptome,and methylome data of *** provide novel insights into the regulation of platycoside biosynthesis by CYP716 and bAS gene families.

关键词： properties insight roots

Evaluation of ring surfaces with several coatings for friction,wear and scuffing life

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中国有色金属学会会刊：英文版 2009年第4期19卷 992-996页

作者： dae-Hyun CHO young-Ze lee School of Mechanical Engineering Sungkyunkwan University

Friction and wear of the sliding components in an automobile cause an increase in both fuel consumption and *** engine components involved with sliding contact are all susceptible to scuffing failure at some points during their operating ***,it is important to evaluate the effects of various surface coatings on the tribological characteristics of the piston ring and cylinder block surface of a diesel *** and scuffing tests were conducted using a friction and wear measurement of the piston ring and cylinder block in a low friction diesel *** frictional forces,wear amounts and cycles to scuffing in the boundary lubricated sliding condition were measured using the reciprocating wear *** tester used a piece of the cylinder block as the reciprocating specimen and a segment of the piston ring material as the fixed *** coatings on the ring specimen were used,such as DLC,TiN,Cr-ceramic and TiAlN,in order to improve the tribological characteristics of the *** coefficients of friction were monitored during the tests,and the wear volumes of the piston ring surfaces with various coatings were *** results show that the DLC coating exhibits better tribological properties than the other *** graphite structure of this coating is responsible for the low friction and wear of the DLC *** TiN and DLC coatings show better scuffing resistance than the other *** TiN and Cr-ceramic coated rings show good wear resistance and high friction.

关键词：涂层表面摩擦评价生活划伤磨损

LoRa Backscatter Network Efficient Data Transmission Using RF Source Range Control

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Computers, Materials & Continua 2023年第2期74卷 4015-4025页

作者： dae-young Kim SoYeon lee Seokhoon Kim Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea Department of Software Convergence Soonchunhyang UniversityAsan31538Korea

Networks based on backscatter communication provide wireless data transmission in the absence of a power source.A backscatter device receives a radio frequency(RF)source and creates a backscattered signal that delivers data;this enables new services in battery-less domains with massive Internet-of-Things(IoT)*** is highly energy-efficient in the context of massive IoT ***,long-range(LoRa)backscattering facilitates large IoT services.A backscatter network guarantees timeslot-and contention-based ***-based transmission ensures data transmission,but is not scalable to different numbers of transmission *** contention-based transmission is used,collisions are *** reduce collisions and increase transmission efficiency,the number of devices transmitting data must be *** control device activation,the RF source range can be modulated by adjusting the RF source power during LoRa *** reduces the number of transmitting devices,and thus collisions and retransmission,thereby improving transmission *** performed extensive simulations to evaluate the performance of our method.

关键词： Backscatter communication LoRa backscatter RF source range control activated device control internet of things

A Wireless Sensor Network Platform for Elderly Persons at Home

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稀有金属材料与工程 2006年第A03期35卷 95-99页

作者： young-Dong lee dae-Seok lee Wan-young Chung Risto Myllylae Dept of Computer Network Eng Graduate School of SoftwareDongseo UniversityBusan 617-716Korea Division of Computer & Information Eng Dongseo UniversityBusan 617-716Korea Dept of Electrical and Information Engineering University of OuluLinnanmaa 90570 OuluFinland

A small size ubiquitous healthcare system for the home care of elderly persons was designed and *** system comprised a wireless sensor network node,base station and server computer for the continuous monitoring of ECG *** data,an important vital sign that is commonly used in clinical and trauma care,were displayed on a graphical user interface (GUI) by transferring the data to a PDA or a terminal *** data transfer was accomplished through a base-station connected to a server computer using TCP/***-time ECG data of elderly persons or patients,as well as historical data,can also be retrieved and played back to assist the *** ubiquitous healthcare system presented in this study can effectively reduce social medical expenses,which will increase greatly in the aging society.

关键词： wireless sensor network ubiquitous healthcare ECG TinyOS platform

Context Awareness by Noise-Pattern Analysis of a Smart Factory

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Computers, Materials & Continua 2023年第8期76卷 1497-1514页

作者： So-Yeon lee Jihoon Park dae-young Kim Department of Software Convergence Soonchunhyang UniversityAsan31538Korea Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea

Recently,to build a smart factory,research has been conducted to perform fault diagnosis and defect detection based on vibration and noise signals generated when a mechanical system is driven using deep-learning technology,a field of artificial *** of the related studies apply various audio-feature extraction techniques to one-dimensional raw data to extract sound-specific features and then classify the sound by using the derived spectral image as a training ***,compared to numerical raw data,learning based on image data has the disadvantage that creating a training dataset is very ***,we devised a two-step data preprocessing method that efficiently detects machine anomalies in numerical raw *** the first preprocessing process,sound signal information is analyzed to extract features,and in the second preprocessing process,data filtering is performed by applying the proposed *** efficient dataset was built formodel learning through a total of two steps of data *** addition,both showed excellent performance in the training accuracy of the model that entered each dataset,but it can be seen that the time required to build the dataset was 203 s compared to 39 s,which is about 5.2 times than when building the image dataset.

关键词： Noise-pattern recognition context awareness deep learning fault detection smart factory

Nitrile Electrolyte Strategy for 4.9 V-Class Lithium-Metal Batteries Operating in Flame

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Energy & Environmental Materials 2023年第3期6卷 229-237页

作者： Hyunseok Moon Sung-Ju Cho dae-Eun Yu Sang-young lee Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Korea Molecular Foundry Lawrence Berkeley National LaboratoryBerkeley CA USA Batteries R&D Center LG Energy SolutionDaejeon 34122Korea

Challenges facing high-voltage/high-capacity cathodes,in addition to the longstanding problems pertinent to lithium(Li)-metal anodes,should be addressed to develop high-energy-density Li-metal *** issue mostly stems from interfacial instability between electrodes and *** carbonate-or ether-based liquid electrolytes suffer from not only volatility and flammability but also limited electrochemical stability ***,we report a nitrile electrolyte strategy based on concentrated nitrile electrolytes(CNEs)with *** CNE consists of high-concentration lithium bis(fluorosulfonyl)imide(LiFSI)in a solvent mixture of succinonitrile(SN)/acetonitrile(AN).The SN/AN solvent mixture is designed to ensure high oxidation stability along with thermal stability,which are prerequisites for high-voltage Li-metal *** CNE exhibits interfacial stability with Li metals due to the coordinated solvation *** nitrate(LiNO_(3))and indium fluoride(InF_(3))are incorporated in the CNE as synergistic co-additives to further stabilize solid-electrolyte interphase(SEI)on Li *** resulting electrolyte(CNE+LiNO_(3)/InF_(3))enables stable cycling performance in Li||LiNi_(0.8)Co_(0.1)Mn_(0.1)and 4.9 V-class Li||LiNi_(0.5)Mn_(1.5)O_(4)***,the Li||LiNi_(0.5)Mn_(1.5)O_(4)cell maintains its electrochemical activity at high temperature(100℃)and even in flame without fire or explosion.

关键词： 4.9 V-class cathodes electrolyte-electrode interfaces lithium-metal batteries nitrile electrolytes safety

Self-Assembled Wire Arrays and ITO Contacts for Silicon Nanowire Solar Cell Applications

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Chinese Physics Letters 2011年第3期28卷 132-135页

作者： YANG Cheng ZHANG Gang lee dae-young LI Hua-Min LIM young-dae YOO Won Jong PARK young-Jun KIM Jong-Min Sungkyunkwan University SKKU Advanced Institute of Nano Technology300 Cheoncheon-dongJangan-guSuwon 440-746Korea Samsung Electronics Co.Ltd. San 14-1 Nongseo-dongGiheung-guYongin 446-712Korea

Self-assembly of silicon nanowire(SiNW)arrays is studied using SF_(6)/0_(2)plasma *** self-assembly method can be applied to single-and poly-crystalline Si *** conditions can control the length and diameter of the SiNW *** reflectance of the wire arrays over the wavelength range 200-1100nm is *** conducting transparent indium-tin-oxide(ITO)electrode can be fully coated on the self-assembled SiNW arrays by *** ITO-coated SiNW solar cells show the same low surface light reflectance and a higher carrier collection efficiency than SiNW solar cells without ITO *** efficiency enhancement of around 3 times for ITO coated SiNW solar cells is demonstrated via experiments.

关键词： reflectance Solar transparent

Development of Cloud Based Air Pollution Information System Using Visualization

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Computers, Materials & Continua 2019年第6期59卷 697-711页

作者： SangWook Han JungYeon Seo dae-young Kim SeokHoon Kim HwaMin lee Deptartment of Computer Science and Engineering Soonchungyang UniversityAsan31538Korea School of Information Technology Engineering Daegu Catholic UniversityGyeongsan38430Korea Department of Computer Software and Engineering Soonchungyang UniversityAsan31538Korea

Air pollution caused by fine dust is a big problem all over the world and fine dust has a fatal impact on human *** there are too few fine dust measuring stations and the installation cost of fine dust measuring station is very *** this paper,we propose Cloud-based air pollution information system using *** measure fine dust,we have developed an inexpensive measuring device and studied the technique to accurately measure the concentration of fine dust at the user’s *** we have developed the smartphone application to provide air pollution *** our system,we provide collected data based analytical results through effective data *** system provides information on fine dust value and action tips through the air pollution information *** it supports visualization on the map using the statistical program *** user can check the fine dust statistics map and cope with fine dust accordingly.

关键词： Air pollution visualization R big data cloud clusters