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Coupled CUBIC Congestion Control for MPTCP in Broadband Networks

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Computer Systems Science & Engineering 2023年第4期45卷 99-115页

作者： jae Yong Lee Byung Chul kim Youngmi Kwon kimoon Han Department of Information and Communications Engineering Chungnam National UniversityDaejeon34134Korea Agency for Defense Development Daejeon34186Korea

Recently,multipath transmission control protocol(MPTCP)was standardized so that data can be transmitted through multiple paths to utilize all available path ***,when high-speed long-distance networks are included in MPTCP paths,the traffic transmission performance of MPTCP is severely deteriorated,especially in case the multiple paths’characteristics are heavily *** order to alleviate this problem,we propose a“Coupled CUBIC congestion control”that adopts TCP CUBIC on a large bandwidth-delay product(BDP)path in a linked increase manner for maintaining fairness with an ordinary TCP traversing the same bottleneck *** verify the performance excellence of the proposed algorithm,we implemented the Coupled CUBIC Congestion Control into Linux kernels by modifying the legacy MPTCP linked-increases algorithm(LIA)congestion control source *** constructed asymmetric heterogeneous network testbeds mixed with large and small BDP paths and compared the performances of LIA and Coupled CUBIC by *** results show that the proposed Coupled CUBIC utilizes almost over 80%of the bandwidth resource in the high BDP path,while the LIA utilizes only less than 20%of the bandwidth for the same *** was confirmed that the resource utilization and traffic transmission performance have been greatly improved by using the proposed Coupled CUBIC in high-speed multipath networks,as well as maintaining MPTCP fairness with competing single-path CUBIC or Reno TCP flows.

关键词： MPTCP congestion control Coupled CUBIC high BDP network

A Compact Tri-Band Antenna Based on Inverted-L Stubs for Smart Devices

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Computers, Materials & Continua 2022年第2期70卷 3321-3331页

作者： Niamat Hussain Anees Abbas Sang-Myeong Park Seong Gyoon Park nam kim Department of Information and Communication Engineering Chungbuk National UniversityCheongju28644Korea Department of Information and Communication Engineering Kongju National UniversityKongju32588Korea

We designed and constructed a novel,compact tri-band monopole antenna for intelligent *** behavior was achieved by placing inverted-L shaped stubs of various lengths in a triangular monopole antenna fed by a coplanar *** resonance frequency of each band can be controlled by varying the length of the corresponding *** bands,at 2.4(2.37-2.51),3.5(3.34-3.71),and 5.5(4.6-6.4)GHz,were easily obtained using three stubs of different *** miniaturization,a portion of the longest stub(at 2.4 GHz)was printed on the opposite side of the substrate,and connected to the main stub via a shorting *** validate the concept,the antenna was fabricated on a low-cost 1.6-mm-thick FR-4 substrate with dimensions of 20×15×1.6 mm^(3).The antenna exhibited a moderate average gain of 2.9 dBi with an omnidirectional radiations over the bandwidths required for RFID,Bluetooth,ISM,WiMAX,andWLAN-band *** features make the antenna suitable for compact smart devices.

关键词： Multiband antenna compact antenna tri-band antenna CPW antenna stub-loaded antenna

Mechanical strength and corrosion resistance of Al-additive friction stir welded AZ31B joints

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Journal of Magnesium and Alloys 2023年第5期11卷 1519-1535页

作者： jae-Yeon kim Eun-Woo kim Dong-O kim Eun-Kyo Ju Ji-Eun Lee jaeheon Lee Jai-Won Byeon Mining Engineering Department Colorado School of MinesGoldenCO 80401USA Department of Materials Science and Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

Compared to other structural alloys,magnesium alloys have a relatively poor corrosion resistance and low mechanical strength,which can be further deteriorated when these alloys are subjected to joining processes using the existing joining ***,we propose for the first time an additive friction stir-welding(AFSW)using fine Al powder as an additive to improve the mechanical strength as well as corrosion resistance of AZ31B weld *** is a solid-state welding method of forming a high-Al AZ31B joint via an in-situ reaction between pure Al powders filled in a machined groove and the AZ31B *** optimize the process parameters,AFSW was performed under different rotational and transverse speeds,and number of passes,using tools with a square or screw *** particular,to fabricate a weld zone,where the Al was homogenously dispersed,the effects of the groove shape were investigated using three types of grooves:surface one-line groove,surface-symmetric grooves,and inserted symmetric *** homogenous and defect-less AFS-welded AZ31B joint was successfully fabricated with the following optimal parameters:1400 rpm,25 mm/min,four passes,inserted symmetric grooves,and the tool with a square *** AFSW fully dissolved the additive Al intoα-Mg and in-situ precipitated Mg_(17)Al_(12)particles,which was confirmed via scanning electron microscopy,transmission electron microscope,and X-ray diffraction *** microhardness,joint efficiency,and elongation at the fracture point of the AFS-welded AZ31B joint were 80 HV,101%,and 8.9%,*** values are higher than those obtained for the FS-welded AZ31 joint in previous *** corrosion resistance of the AFS-welded AZ31B joint,evaluated via hydrogen evolution measurements and potentiodynamic polarization tests,was enhanced to 55%relative to the FS-welded AZ31B joint.

关键词： AZ31B magnesium alloy Additive friction stir-welding In-situ reaction Mg_(17)Al_(12)particles Joint efficiency Corrosion resistance

Data Utilization-Based Adaptive Data Management Method for Distributed Storage System in WAN Environment

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Computer Systems Science & Engineering 2023年第9期46卷 3457-3469页

作者： Sanghyuck nam jaehwan Lee Kyoungchan kim Mingyu Jo Sangoh Park School of Computer Science and Engineering Chung-Ang UniversitySeoul06974Korea Department of Computer Science and Engineering Kongju National UniversityCheonan31080Korea Qucell Networks Seongnam13590Korea

Recently,research on a distributed storage system that efficiently manages a large amount of data has been actively conducted following data production and demand *** expansion limits exist for traditional standalone storage systems,such as I/O and file system ***,the existing distributed storage system does not consider where data is consumed and is more focused on data dissemination and optimizing the lookup cost of data *** this leads to system performance degradation due to low locality occurring in a Wide Area Network(WAN)environment with high network *** problem hinders deploying distributed storage systems to multiple data centers over *** lowers the scalability of distributed storage systems to accommodate data storage *** paper proposes a method for distributing data in a WAN environment considering network latency and data locality to solve this problem and increase overall system *** proposed distributed storage method monitors data utilization and locality to classify data temperature as hot,warm,and *** assigned data temperature,the proposed algorithm adaptively selects the appropriate data center and places data accordingly to overcome the excess latency from the WAN environment,leading to overall system performance *** paper also conducts simulations to evaluate the proposed and existing distributed storage *** result shows that our proposed method reduced latency by 38%compared to the existing ***,the proposed method in this paper can be used in large-scale distributed storage systems over a WAN environment to improve latency and performance compared to existing methods,such as consistent hashing.

关键词： Distributed system distributed storage distributed computing object storage

Delayed-onset endophthalmitis associated with Achromobacter species developed in acute form several months after cataract surgery:Three case reports

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World Journal of Clinical Cases 2022年第19期10卷 6496-6500页

作者： Tae-Hoon kim Sang-Joon Lee Ki-Yup nam Department of Ophthalmology Kosin University HospitalBusan 49267South Korea Department of Ophthalmology Kosin UniversityCollege of MedicineBusan 49267South Korea Department of Ophthalmology Chungnam National UniveristyCollege of MedicineDaejeon 35015South Korea Department of Ophthalmology Chungnam National University Sejong HospitalSejong 30099South Korea

BACKGROUND Achromobacter species-associated endophthalmitis is rare and may present as either acute or chronic postoperative ***-onset Achromobacter species endophthalmitis appearing in acute presentation that develops more than several months after cataract surgery is very *** lens(IOL)removal is commonly recommended to treat Achromobacter species endophthalmitis,which is based on previous ***,we report the results of surgery without IOL removal when treating patients with delayed-onset postoperative Achromobacter species endophthalmitis that developed in an acute *** SUMMARY Three patients visited our ophthalmology clinic due to visual impairment that began 2-3 d *** had undergone cataract surgery 5-18 mo *** visual acuity of the diseased eye was between counting fingers at 30 cm to non-light *** showed conjunctival injection,inflammation in the anterior chamber(cell reaction 4+)and hypopyon *** patients were diagnosed with infectious endophthalmitis and immediately underwent pars plana vitrectomy,anterior chamber irrigation and intravitreal injection of ceftazidime and *** fluid infusion,a vitreous specimen was obtained. In all cases, the IOLs were not removed. Achromobacter species was detected on vitreousspecimen culture. After surgery, the vitreous opacity decreased gradually and there was littleretinal damage. At 1 mo after treatment, the best-corrected visual acuity had improved to 20/50and 20/*** onset postoperative endophthalmitis caused by Achromobacter species can appear in anacute form. All patients responded well to early vitrectomy and administration of empiricalantibiotics including ceftazidime. There was no need for IOL removal during surgery.

关键词： Achromobacter species Chronic endophthalmitis Postoperative endophthalmitis Case report

Rapid species identification of pathogenic bacteria from a minute quantity exploiting three-dimensional quantitative phase imaging and artificial neural network

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Light(Science & Applications) 2022年第7期11卷 1595-1606页

作者： Geon kim Daewoong Ahn Minhee Kang Jinho Park DongHun Ryu YoungJu Jo Jinyeop Song Jea Sung Ryu Gunho Choi Hyun Jung Chung Kyuseok kim Doo Ryeon Chung In Young Yoo Hee jae Huh Hyun-seok Min nam Yong Lee YongKeun Park Department of Physics Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea KAIST Institute for Health Science and Technology KAISTDaejeon 34141Republic of Korea Tomocube Inc. Daejeon 34109Republic of Korea Smart Healthcare&Device Research Center Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Graduate School of Nanoscience and Technology Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Biological Sciences Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Emergency Medicine Bundang CHA HospitalSeongnam-siGyeonggi-Do 13496Korea Division of Infectious Diseases Department of Internal MedicineSamsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Department of Laboratory Medicine Seoul St.Mary's HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591Republic of Korea Department of Laboratory Medicine and Genetics Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Department of Applied Physics Stanford UniversityStanfordCA 94305USA Department of Physics Massachusetts Institute of TechnologyCambridgeMA 02139USA

The healthcare industry is in dire need of rapid microbial identification techniques for treating microbial *** infections are a major healthcare issue worldwide,as these widespread diseases often develop into deadly *** studies have shown that an early appropriate antibiotic treatment significantly reduces the mortality of an infection,this effective treatment is difficult to *** main obstacle to early appropriate antibiotic treatments is the long turnaround time of the routine microbial identification,which includes time-consuming sample ***,we propose a microscopy-based framework that identifies the pathogen from single to few *** framework obtains and exploits the morphology of the limited sample by incorporating three-dimensional quantitative phase imaging and an artificial neural *** demonstrate the identification of 19 bacterial species that cause bloodstream infections,achieving an accuracy of 82.5%from an individual bacterial cell or *** performance,comparable to that of the gold standard mass spectroscopy under a sufficient amount of sample,underpins the effectiveness of our framework in clinical ***,our accuracy increases with multiple measurements,reaching 99.9%with seven different measurements of cells or *** believe that our framework can serve as a beneficial advisory tool for clinicians during the initial treatment of infections.

关键词： artificial neural exploit

Super-elastic and mechanically durable MXene-based nanocomposite aerogels enabled by interfacial engineering with dual crosslinking strategy

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Nano Research 2023年第5期16卷 8025-8035页

作者： Yan Sun Xin Yang Ruonan Ding Sung Yong Hong Jinwoo Lee Zongfu An Mei Wang Yifei Ma jae-Do nam Jonghwan Suhr China Copper Institute of Engineering and Technology Chinalco Research Institute of Science and Technology Co.Ltd.Beijing 102200China Center for Composite Materials and Concurrent Design Sungkyunkwan UniversitySuwon 16419Republic of Korea Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea MPP PJT.PO R&D Center Polyolefin Business Petrochemicals DivisionLG ChemDaejeon 34122Republic of Korea Department of Polymer Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Recently,MXenes have attracted considerable attention owing to their unique physical and chemical *** of MXenes to three-dimensional(3D)porous aerogel structures can play a critical role in realizing the profound implications of MXenes,especially for environmental ***,developing mechanically robust MXene-based aerogels with reversible compressibility under harsh conditions,such as liquid environments,remains challenging due to the insufficient interfacial strength between MXene ***,3D porous MXene-based nanocomposite aerogels are developed by dual physical and chemical crosslinking strategy with poly(vinyl alcohol)and formaldehyde in this *** developed MXenebased nanocomposite aerogels with designed interfacial engineering exhibit outstanding structural stability and extremely high reversible compressibility up to 98%strain as well as unprecedented mechanical durability(2000 cycles at 50%strain)in water ***,the aerogels show adaptable compressibility when exposed to different solvents,which is explained with the Hansen solubility *** to their high compressibility in water,the robust MXene-based aerogels exhibit excellent methylene blue adsorption performance(adsorption capacity of 117.87 mg·g^(−1))and superior recycling efficiency(89.48%at the 3rd cycle).The porous MXene-based nanocomposite aerogels are also demonstrated with outstanding thermal insulation ***,by synergistically taking their porous structure and super elasticity in liquid environment,the MXene-based aerogels show great promise in diverse applications including adsorption and separation,wastewater purification desalination,and thermal management.

关键词： MXenes-based nanocomposite aerogels dual crosslinking strategy reversible compressibility methylene blue adsorption thermal insulation

Milk protein-shelled gold nanoparticles with gastrointestinally active absorption for aurotherapy to brain tumor

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Bioactive Materials 2022年第2期7卷 35-48页

作者： Hyung Shik kim Seung jae Lee Dong Yun Lee Department of Bioengineering College of Engineeringand BK FOUR Biopharmaceutical Innovation Leader for Education and Research GroupHanyang UniversitySeoul04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul04763Republic of Korea

Orally absorbable gold nanoparticles(AuNP)having cancer ablation therapy is strongly demanded to treat glioblastoma multiforme(GBM)for patients with its highest incidence ***,we develop a milk protein lactoferrin-conjugated AuNP for its oral absorption and targeting to the GBM through the interaction between lactoferrin(Lf)and lactoferrin receptor(LfR)that is highly expressed in the intestine,blood-brain barrier and *** stability and long circulation of AuNP,glutathione and polyethylene glycol(PEG)is introduced,which is called to *** Lf-PEG-AuNP are orally administered to orthotopic GBM-bearing mice,11-fold and 8-fold higher concentrations of AuNP are measured in bloodstreams and GBM in the brain,respectively,compared with ***,orally administered Lf-PEG-AuNP exhibit an outstanding temperature rise in GBM by irradiating laser and significantly reduce tumor ***,we suggest that the Lf-PEG-AuNP can fundamentally target GBM in the brain through oral absorption,and that its efficient photothermal therapy is possible.

关键词： intestine absorption gastrointestinal

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