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Nano Materials Science 2021年第3期3卷 233-240页

作者： Vineet Kumar Anuj Kumar Sung Soo Han sang-shin park School of Mechanical Engineering Yeungnam UniversitySouth Korea School of Chemical Engineering Yeungnam UniversitySouth Korea

The use of nanofillers with high surface area and extreme purity in polymer composite is an effective strategy to obtain high performance polymeric ***,the effect of nanofillers such as carbon nanotubes(CNT),titanium dioxide(TiO_(2)),and their hybrid on rubber-based composites was *** this study,rubber nanocomposites were fabricated by using room temperature vulcanized(RTV)silicone rubber matrix and nanofillers(***,TiO_(2),and CNT-TiO_(2))through solution casting ***,the purity and surface area of CNT(purity:>96%and BET surface area:300 m2/g)and TiO_(2)(purity:>98%and BET surface area:165 m2/g)were estimated by field emission scanning electron microscopy/energy dispersive X-ray(FESEM-EDX)and adsorption *** mechanical properties of the rubber nanocomposites were enhanced by incorporating *** compressive modulus was 2.18 MPa for unfilled composites and increased to 6.8 MPa(CNT),3.95 MPa(CNT-TiO_(2)),and 2.44 MPa(TiO_(2))at 5 phr,***,the tensile strength was 0.54 MPa for unfilled composites and increased to 1.37 MPa(CNT),1.33 MPa(CNT-TiO_(2))and 0.61 MPa(TiO_(2))at 5 phr,***,the actuation displacement was improved with increasing input voltage and it was 2 mm for CNT,1.6 mm for CNT-TiO_(2) hybrid and 0.5 mm for TiO_(2) at 10 ***,a series of experiments show the potential application in piezoelectric actuation.

关键词： Multi-walled carbon nanotubes Titanium dioxide Hybrid Mechanical properties Piezoeletric actuation

Hash join in commercial database with Flash memory SSD

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Hash join in commercial database with Flash memory SSD

Cross-Domain Bilateral Access Control on Blockchain-Cloud Based Data Trading System

2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： sang-shin park sang-Won Lee Department of Computer Science Sungkyunkwan University Suwon South Korea Department of Computer Science SungkyunKwan University Suwon South Korea

＜正＞Hash join is one of important operations in database system,and its performance may slow down because of disk I/O in hash table overflow *** that phenomenon, the more overflow of hash table occurs,the more disk I/O arise, so join performance go from bad to *** disk I/O patterns of hash join are sequential writes and random reads, then flash memory SSD is in a more advantageous position than magnetic disk on those I/O ***,using a flash memory SSD instead of magnetic disk as a temporary storage of database will prevent existing performance *** this paper,we show calculated costs by query optimizer in some test cases *** then,we also show empirically hash join performance in these test cases on temporary table space created on magnetic disk and flash memory ***,the average response time with flash memory SSD was about nine times,minimum and twenty times,max faster than that with magnetic *** you might encounter problems that estimated cost by query optimizer and real performance do not correspond on magnetic ***, that problem was solved on flash memory SSD.

关键词： Hash join Overflow Flash memory SSD Optimizer

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 671-688页

作者： Youngho park Su Jin shin sang Uk shin Electronics and Information Communications Research Center Pukyong National UniversityBusan48513Republic of Korea Department of Information Security Graduate SchoolPukyong National UniversityBusan48513Republic of Korea Division of Computer Engineering Pukyong National UniversityBusan48513Republic of Korea

Data trading enables data owners and data requesters to sell and purchase *** the emergence of blockchain technology,research on blockchain-based data trading systems is receiving a lot of ***,to reduce the on-chain storage cost,a novel paradigm of blockchain and cloud fusion has been widely considered as a promising data trading ***,the fact that data can be used for commercial purposes will encourage users and organizations from various fields to participate in the data *** the data marketplace,it is a challenge how to trade the data securely outsourced to the external cloud in a way that restricts access to the data only to authorized users across multiple *** this paper,we propose a cross-domain bilateral access control protocol for blockchain-cloud based data trading *** consider a system model that consists of domain authorities,data senders,data receivers,a blockchain layer,and a cloud *** proposed protocol enables access control and source identification of the outsourced data by leveraging identity-based cryptographic *** the proposed protocol,the outsourced data of the sender is encrypted under the target receiver’s identity,and the cloud provider performs policy-match verification on the authorization tags of the sender and receiver generated by the identity-based signature ***,data trading can be achieved only if the identities of the data sender and receiver simultaneously meet the policies specified by each *** demonstrate efficiency,we evaluate the performance of the proposed protocol and compare it with existing studies.

关键词： Bilateral access control blockchain data sharing policy-match

Blockchain-Based Secure and Fair IoT Data Trading System with Bilateral Authorization

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Computers, Materials & Continua 2023年第8期76卷 1871-1890页

作者： Youngho park Mi Hyeon Jeon sang Uk shin Electronics and Information Communications Research Center Pukyong National UniversityBusanKorea Department of Information Security Graduate SchoolPukyong National UniversityBusanKorea Division of Computer Engineering Pukyong National UniversityBusanKorea

These days,data is regarded as a valuable asset in the era of the data economy,which demands a trading platform for buying and selling ***,online data trading poses challenges in terms of security and fairness because the seller and the buyer may not fully trust each ***,in this paper,a blockchain-based secure and fair data trading system is proposed by taking advantage of the smart contract and matchmaking *** proposed system enables bilateral authorization,where data trading between a seller and a buyer is accomplished only if their policies,required by each other,are satisfied *** can be achieved by exploiting the security features of the matchmaking *** guarantee non-repudiation and fairness between trading parties,the proposed system leverages a smart contract to ensure that the parties honestly carry out the data trading ***,the smart contract in the proposed system does not include complex cryptographic operations for the efficiency of onchain ***,these operations are carried out by off-chain parties and their results are used as input for the on-chain *** system also uses an arbitration protocol to resolve disputes based on the trading proof recorded on the *** performance of the protocol is evaluated in terms of off-chain computation overhead and on-chain gas *** results of the experiments demonstrate that the proposed protocols can enable the implementation of a cost-effective data trading system.

关键词： Bilateral authorization blockchain data marketplace fair exchange policy matching secure data trading

Comprehensive analysis of two-dimensional charge transport mechanism in thin-film transistors based on random networks of single-wall carbon nanotubes using transient measurements

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Nano Research 2022年第2期15卷 1524-1531页

作者： Hyeonwoo shin sang-Joon park Byeong-Cheol Kang Tae-Jun Ha Department of Electrical Engineering and Computer Science Inter-university Semiconductor Research CenterSeoul National UniversitySeoul 08826Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897Korea

Understanding charge transport mechanisms in thin-film transistors based on random networks of single-wall carbon nanotubes(SWCNT-TFTs)is essential for further advances to improve the potential for various nanoelectronic ***,a comprehensive investigation of the two-dimensional(2D)charge transport mechanism in SWCNT-TFTs is reported by analyzing the temperature-dependent electrical characteristics determined from the direct-current and non-quasi-static transient measurements at 80-300 *** elucidate the time-domain charge transport characteristics of the random networks in the SWCNTs,an empirical equation was derived from a theoretical trapping model,and a carrier velocity distribution was determined from the differentiation of the transient ***,charge trapping and de-trapping in shallow-and deep-traps in SWCNT-TFTs were analyzed by investigating charge transport based on their trapping/de-trapping *** comprehensive analysis of this study provides fundamental insights into the 2D charge transport mechanism in TFTs based on random networks of nanomaterial channels.

关键词： single-wall carbon nanotube random networks two-dimensional(2D)charge transport time-domain transient measurements charge trapping/de-trapping shallow-/deep-traps

Microstructure and Mechanical Properties of TiB-Containing Al–Zn Binary Alloys

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Journal of Materials Science & Technology 2016年第7期32卷 653-659页

作者： sang-Soo shin Gil-Yong Yeom Tae-Yang Kwak Ik-Min park Department of Materials Science and Engineering Pusan National University Busan 609-735 Republic of Korea Liquid Processing & Casting Technology R&BD Group Korea Institute of Industrial Technology Incheon 21999 Republic of Korea

The microstructure and mechanical properties of newly developed Al-35Zn cast alloys with TiB refiner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these alloys featured α-Al den- drites surrounded by AI-Zn （α ＋ rI） eutectic structures. After the addition of TiB refiner, the alloy grain sizes decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an im- proved microstructure of the modified alloys was accompanied by a significant increase in the tensile strength and elongation percentage compared to those of the AI-Zn or Zn-Al-based alloys. The results showed that with the increase of TiB content up to 0.05%, the morphology of α-Al dendrites and α ＋ T1 phases changed from coarse dendrite and lamellar structures into independent and fine ones. Based on these results, the effect of TiB refiner addition on the microstructure and mechanical properties of the AI-35Zn binary alloys was investigated.

关键词： Al-Zn(-Cu) alloyEutectic structureHigh strengthTiB2

Effect of Sub-T_g Annealing on the Corrosion Resistance of the Cu–Zr Amorphous Alloys

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 273-280页

作者： sang-Soo shin Hong-Kyu Kim Jae-Chul Lee Ik-Min park Department of Materials Science and Engineering Pusan National University Advanced Analysis Center Korea Institute of Science and Technology Department of Materials Science and Engineering Korea University

Despite the economy of material cost and excellent toughness of Cu-based amorphous alloys,especially CusoZrso,their poor corrosion resistance to a chloride medium limits their widespread *** this study,corrosion tests were performed on the CusoZrso amorphous alloy with different degrees of short-range order,which were prepared by annealing below the glass transition temperature（Tg）.It was found that the corrosion resistance of amorphous alloys is improved to a significant level when the alloys were heated below *** studies showed that thermally activated relaxation process of created disorder,which occurs during sub-Tg annealing,is responsible for the improvement in the corrosion *** dynamics simulations performed on the Cu-Zr amorphous alloys demonstrated that the relaxation process of the alloys is associated with the formation of energetically stable icosahedra and icosahedron-like *** study highlights the effects of sub-Tg annealing on the improvement in the corrosion resistance of the amorphous alloys from the viewpoint the relaxation process of the short-range orders.

关键词： Amorphous alloys Corrosion Annealing Molecular dynamics Electrochemical performance

Electrical Stimulation of Auricular Acupressure for Dry Eye:A Randomized Controlled-Clinical Trial

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Chinese Journal of Integrative Medicine 2017年第11期23卷 822-828页

作者： Jong Soo Lee sang Ho Hwang Byung Cheul shin Young Min park Department of Ophthalmology School of MedicinePusanNational University and Medical Research InstitutePusan National University HospitalPusan(602-739)Republic of Korea Department of Ophthalmology Jung's Eye CenterPusan(616-849)Republic of Korea Division of Clinical Medicine School of Korean MedicinePusan National UniversityYangsan(626-870)Republic of Korea Department of Ophthalmology Gyeongsang National University School of MedicineGyeongsang National University Changwon HospitalChangwon(51472)Republic of Korea

Objective： To evaluate the clinical efficacy of electrical stimulation（ES） of auricular acupressure on reducing the ocular symptoms and signs before and after treatment for dry eye. Methods： The inclusion criteria were the tear film break-up time（TFBUT） below 5 s and a Schirmer test-Ⅰ below 5 mm in dry eyes with ocular symptoms for at least 6 months. Subjects were randomized into a treatment group（50 cases） with continuous low frequency ES under auricular acupressure at acupoints and a no ES under auricular acupressure（no-ES, control group, 50 cases） on the same acupoints. Auricular acupressure were stimulated with ES at 4 master points of both ears, which were performed twice a week for 4 weeks at each point for 30 s. The ocular symptoms, the TFBUT, and Schirmer test-Ⅰ were evaluated before and after this procedure. Results： There were significantly better scores in TFBUT（P=0.032）, the Schirmer test-Ⅰ（P=0.044） and ocular symptoms（P=0.029） at 3 months post-treatment in the treatment group than in the control group. The total effective rate in the treatment group was accomplished in 41（82%） of the 50 cases of dry eye. Conclusions： Auricular acupressure with ES at auricular acupoint improves ocular symptoms and signs of dry eye for a period of at least 3 months.

关键词： auricular acupressure dry eye syndromes electrical stimulation tears

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皮革的可塑性 POLENE首尔专卖店

室内设计与装修 2025年第1期 90-95页

作者：无 Minwoo(Ian)Yang Sunho shin Hyevin park Yongjoon Choi(摄影) 秋落(编译) WGNB 不详

继巴黎、纽约和东京之后,专注皮革设计的小众品牌Pol$ne于日前在韩国首尔开设首家品牌旗舰店,也是全球第4间专卖店。这个深受时尚迷和年轻一代欢迎的法国小众品牌,将店址选在逛街胜地之一的江南新沙洞,打造了两层的品牌旗舰店。除了延... 详细信息

继巴黎、纽约和东京之后,专注皮革设计的小众品牌Pol$ne于日前在韩国首尔开设首家品牌旗舰店,也是全球第4间专卖店。这个深受时尚迷和年轻一代欢迎的法国小众品牌,将店址选在逛街胜地之一的江南新沙洞,打造了两层的品牌旗舰店。除了延续品牌形象,引进品牌经典包款和人气新作,受到韩国打卡文化的影响,Pol$ne为首尔旗舰店精心规划出拍照空间,凡是走进店内的人,都会忍不住想要拿起手机留下回忆。

关键词：小众品牌旗舰店皮革品牌形象专卖店 Pol

Effects of mesenchymal stem cell on dopaminergic neurons,motor and memory functions in animal models of parkinson's disease:a systematic review and meta-analysis

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Neural Regeneration Research 2024年第7期19卷 1584-1592页

作者： Jong Mi park Masoud Rahmati sang Chul Lee Jae Il shin Yong Wook Kim Department and Research Institute of Rehabilitation Medicine Yonsei University College of MedicineSeoulSouth Korea Department of Physical Education and Sport Sciences Faculty of Literature and Human SciencesLorestan UniversityKhoramabadIran Department of Pediatrics Yonsei University College of MedicineSeoulSouth Korea

parkinson’s disease is chara cterized by the loss of dopaminergic neurons in the substantia nigra pars com pacta,and although restoring striatal dopamine levels may improve symptoms,no treatment can cure or reve rse the disease *** cell therapy has a regenerative effect and is being actively studied as a candidate for the treatment of parkinson’s *** stem cells are considered a promising option due to fewer ethical concerns,a lower risk of immune rejection,and a lower risk of *** performed a meta-analysis to evaluate the therapeutic effects of mesenchymal stem cells and their derivatives on motor function,memory,and preservation of dopamine rgic neurons in a parkinson’s disease animal *** searched bibliographic databases(PubMed/MEDLINE,Embase,CENTRAL,Scopus,and Web of Science)to identify articles and included only pee r-reviewed in vivo interve ntional animal studies published in any language through J une 28,*** study utilized the random-effect model to estimate the 95%confidence intervals(CI)of the standard mean differences(SMD)between the treatment and control *** use the systematic review center for laboratory animal expe rimentation’s risk of bias tool and the collaborative approach to meta-analysis and review of animal studies checklist for study quality assessment.A total of 33studies with data from 840 parkinson’s disease model animals were included in the *** with mesenchymal stem cells significantly improved motor function as assessed by the amphetamine-induced rotational *** the stem cell types,the bone marrow MSCs with neurotrophic factor group showed la rgest effect size(SMD[95%CI]=-6.21[-9.50 to-2.93],P=0.0001,I^(2)=0.0%).The stem cell treatment group had significantly more tyrosine hydroxylase positive dopamine rgic neurons in the striatum([95%CI]=1.04[0.59 to 1.49],P=0.0001,I^(2)=65.1%)and substantia nigra(SMD[95%CI]=1.38[0.89 to 1.87],P=0.0001,I^(2)=75.3%),indicating a

关键词： animal animal experimentation mesenchymal stem cells models parkinson’s disease stem cell transplantation