检索结果-南通市图书馆

Journal of Materials Science & Technology 2015年第5期31卷 498-503页

作者： Mosab Kaseem Bong kwon Chung Hae Woong Yang Kotiba Hamad young Gun Ko School of Materials Science and Engineering Yeungnam University

A differential-speed rolling(DSR) was applied to AZ31 magnesium alloy sample at different rolling temperatures of 473,523,573,and 623 K with 1-pass and 2-pass *** microstructural evolution and mechanical properties of the deformed samples were *** rolling temperature was found to be an important parameter affecting the microstructural *** DSR at 473 K,the microstructure was more homogeneous than that obtained after deformation by equal-speed rolling(ESR).The fully recrystallized microstructures were generated after DSR at 573 and 623 *** to mechanical properties,the yield strength(YS) and ultimate tensile strength(UTS) decreased monotonously with increasing rolling *** contrast,the elongation of the DSR-deformed samples was improved as the rolling temperature *** strain hardening exponent(n) calculated by Hollomon equation increased with increasing the rolling temperature,which would explain an increase in the uniform elongation.

关键词： Differential-speed rolling Magnesium alloy Mechani

Electrical and Corrosion Properties of Titanium Aluminum Nitride Thin Films Prepared by Plasma-Enhanced Atomic Layer Deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第3期33卷 295-299页

作者： Eun-young Yun Woo-jae Lee Qi Min Wang Se-Hun kwon School of Materials Science and Engineering Pusan National University School of Electromechanical Engineering Guangdong University of Technology

Titanium-aluminum-nitride（TiAlN） films were grown by plasma-enhanced atomic layer deposition（PEALD）on 316 L stainless steel at a deposition temperature of 200 °C. A supercycle, consisting of one AlN and ten TiN subcycles, was used to prepare TiAlN films with a chemical composition of Ti（0.25）Al（0.25）N（0.50）. The addition of AlN to TiN resulted in an increased electrical resistivity of TiAlN films of 2800 μΩ cm, compared with 475 μΩ cm of TiN films, mainly due to the high electrical resistivity of AlN and the amorphous structure of TiAlN. However, potentiostatic polarization measurements showed that amorphous TiAlN films exhibited excellent corrosion resistance with a corrosion current density of 0.12 μA/cm^2, about three times higher than that of TiN films, and about 12.5 times higher than that of 316 L stainless steel.

关键词： Titanium-aluminum nitride Plasma-enhanced atomic layer deposition Corrosion protection Ternary transition metal nitrides

Refining the American Urological Association and American Society for Radiation Oncology guideline for adjuvant radiotherapy after radical prostatectomy using the pathologic Gleason score

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2017年第1期19卷 20-25页

作者： Wan Song young Suk kwon Seong Soo Jeon Isaac Yi Kim Section of Urologic Oncology Rutgers Cancer Institute of New Jersey Rutgers The State University of New Jersey New Brunswick NJ 08903 USA Department of Urology Samsung Medical Center Sungkyunkwan University School of Medicine Seoul South Korea.

Recently, it has been suggested that the guideline for adjuvant radiotherapy （ART） following radical prostatectomy （RP） sponsored by the American Urological Association and American Society for Radiation Oncology （AUA/ASTRO） may result in a significant overtreatment. Thus, the objective of the present study was to refine the AUA/ASTRO guideline for ART in patients at risk for biochemical recurrence （BCR） after RP. To this end, we reviewed our prospectively maintained database and selected 193 patients who met the AUA/ASTRO ART criteria. With a median follow-up of 24.0 months, BCR rate was 17.6% （34/193）. When stratified by the Gleason score, BCR rate in men with Gleason score 6 was 6.8%. There was no significant association between BCR-free survival and surgical margin （P= 0.690） and pathologic stage （P= 0.353） in patients with the Gleason score 6. However, in patients with positive surgical margins （PSMs）/pathologic stage ≥T3, there was a significant difference in BCR-free survival according to Gleason score （≤7 vs8-10, P= 0.047）. Multivariate Cox regression analysis demonstrated that pathologic stage ≥T3 （HR = 2.106; P = 0.018）, PSMs （HR = 2.411; P = 0.003）, and pathologic Gleason score 8-10 （HR = 4.715; P 〈 0.001） were independent predictors of BCR after RP. Therefore, in addition to pathologic stage 〉T3 and PSMs, Gleason score 8-10 predicts 8CR after RP. In patients with Gleason score 6, observation rather than ART may be more appropriate regardless of stage and surgical margin status.

关键词： adjuvant radiotherapy biochemical recurrence radical prostatectomy

Preparation of AZ91D Slurries for Semi-Solid Forming Using Al8 ( Mn, Fe) 5 Precipitates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z2期22卷 42-46页

作者： Ji young Byun Soon Il kwon Jeong Man Doh Heon Phil Ha Metal Processing Research Center Division of MaterialsKorea Institute of Science and Technology# 39-1 Haweolgok-DongSungbuk-KuSeoul 136-791Republic of Korea

During the solidification of the AZ91D-alloys, the Al8(Mn, Fe)5 phase is generally precipitated in the melt in advance of the precipitation of the primary α-Mg. The basic principle for manufacturing AZ91D-alloy slurries for semi solid forming is to use the Al8(Mn, Fe)5 precipitates as the heterogeneous nucleation sites for primary α-Mg phases. Microscopic analysis for the location of the Al8(Mn, Fe)5 precipitate explains that the Al8(Mn, Fe)5 precipitate is the effective heterogeneous nucleation site for the primary α-Mg phase. It was also observed that increase of the Mn content in the melt and the cooling rate below to the solid/liquid two-phase region resulted in smaller and more globular primary α-Mg due to the increase of heterogeneous nucleation sites. It was found that the average α-Mg diameter grew as a function of t0.278, where t is the holding time at the solid/liquid two-phase region. This would be attributed to the Ostwald type ripening and coalescence between primary α-Mg phases. The cooling rate below to the solid/liquid two-phase region, Mn content in AZ91D alloy, and the holding time and temperature affected on the quality of slurry.

关键词： AZ91D alloy semi-solid forming solidification heterogeneous nucleation

Semantic Segmentation by Using Down-Sampling and Subpixel Convolution: DSSC-UNet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第4期75卷 683-696页

作者： young-Man kwon Sunghoon Bae Dong-Keun Chung Myung-jae Lim Department of Medical IT Eulji University553Sanseong-daeroSujeong-guSeongnam-siGyeonggi-do13135Korea

Recently, semantic segmentation has been widely applied toimage processing, scene understanding, and many others. Especially, indeep learning-based semantic segmentation, the U-Net with convolutionalencoder-decoder architecture is a representative model which is proposed forimage segmentation in the biomedical field. It used max pooling operationfor reducing the size of image and making noise robust. However, instead ofreducing the complexity of the model, max pooling has the disadvantageof omitting some information about the image in reducing it. So, thispaper used two diagonal elements of down-sampling operation instead ofit. We think that the down-sampling feature maps have more informationintrinsically than max pooling feature maps because of keeping the Nyquisttheorem and extracting the latent information from them. In addition,this paper used two other diagonal elements for the skip connection. Indecoding, we used Subpixel Convolution rather than transposed convolutionto efficiently decode the encoded feature maps. Including all the ideas, thispaper proposed the new encoder-decoder model called Down-Sampling andSubpixel Convolution U-Net (DSSC-UNet). To prove the better performanceof the proposed model, this paper measured the performance of the UNetand DSSC-UNet on the Cityscapes. As a result, DSSC-UNet achieved89.6% Mean Intersection OverUnion (Mean-IoU) andU-Net achieved 85.6%Mean-IoU, confirming that DSSC-UNet achieved better performance.

关键词： Semantic segmentation encoder-decoder U-Net DSSC-UNet subpixel convolution down-sampling

Moving Personal-Cell Network: Characteristics and Performance Evaluation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2018年第12期15卷 159-173页

作者： Syed Tariq Shah Minsu Shin young Min kwon jaeSheung Shin Ae-Soon Park Min young Chung Department of Electrical and Computer Engineering Sungkyunkwan University Department of Telecommunication Engineering FICT Balochistan University of Information Technology Engineering and Management Sciences Mobile Access Research Division Electronics and Telecommunications Research Institute

Recent years have witnessed a huge demand for ubiquitous communications services from continuously moving users. In order to provide seamless network services to high-mobility users, one of the promising solution proposed by 3 GPP is the deployment of moving-relays. In this article, we introduce the concept of Moving-Personal-Cell(mPC), which is a type of moving-relays. mPC is a user-centric network, which aims to provide reliable network services to moving users. A mPC receives data-traffic from eNB and its neighboring mPCs via wireless backhaul and sidehual links respectively and forwards the received data to its serving users. In addition to this, mPC can also increase the network capacity by caching and distributing the popular contents to its serving users. Besides these pros, the mPC also has some limitations, as its performance is highly affected by cross-tier and co-tier interferences. In this article, we analyze the effect of these interferences on mPCs performance. Our results show that the performance of mPC network is equally affected by the capacity of wireless backhaul, sidehaul, and access links. Moreover, since mPCs accommodate data traffic from wireless backhaul, sidehaul links, and content cache, their performance is also affected by the ratio of data-traffic delivered via these links.

关键词： heterogeneous networks moving small cells fixed small cells moving cache network performance evaluation next generation networks

Clinical Efficacy and Safety of Miniscalpel-Needle Treatment for Tension-Type Headache:A Systematic Review and Meta-Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2020年第9期26卷 713-720页

作者： Chan-young kwon Sang-Hoon Yoon Sun-Yong Chung Jong Woo Kim Department of Clinical Korean Medicine Graduate SchoolKyung Hee U niversitySeoul(02447)Republic of Korea Chung-Yeon Central Institute Gwang-juRepublic of Korea Department of Oriental Neuropsychiatry Kyung Hee University Hospital at GangdongSeoul(02447)Republic of Korea

Objective:To investigate the clinical efficacy and safety of miniscalpel-needle(MSN)treatment for tension-type headache(TTH).Method:Seven medical databases were searched to identify randomized controlled trials(RCTs)evaluating the effect and safety of MSN *** articles published up to November 15,2018 were retrieved.A meta-analysis was conducted for the included studies,and the risk of bias was *** outcomes were visual analogue scale(VAS)or numeric rating scale(NRS)*** outcomes were clinical effective rates including total effective rate(TER),markedly effective rate(MER),and totally cured rate(TCR)determined by improvement in clinical symptoms or VAS scores,the frequency of adverse events(AEs)that occurred during the study,and participant quality of life(QOL).Results:Seven RCTs involving 724 participants were *** treatment showed significantly higher MER and TCR[relative risk(RR)1.27,95%confidence interval(Cl)1.01 to 1.61;RR 1.31,95%Cl 1.09 to 1.57,respectively],but not TER(RR 1.03,95%Cl 0.96 to 1.10)compared to *** treatment plus conventional treatment showed significant lower VAS and higher TER,MER,and TCR(mean difference-3.54,95%Cl-3.80 to-3.28;RR 1.14,95%Cl 1.06 to 1.23;RR 2.31,95%Cl 1.50 to 3.58;RR 3.01,95%Cl 2.25 to 4.02,respectively)compared to conventional ***:According to current evidence,MSN treatment as a monotherapy or as an adjunctive treatment to other existing treatments might have benefits on treating ***,since the number and the sample size of studies included were both small and the methodological quality was poor,the findings of this review should be interpreted with great caution,and our confidence in the results is low.A high quality RCT using objective outcomes should be performed on this topic.

关键词： acupuncture acupotomy tension-type headache systematic review meta-analysis

Anti-anger Effects of Herbal Medicine:A Mini-Review of Rat Studies

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2022年第3期28卷 263-271页

作者： Chan-young kwon Hyo-Weon Suh Jong Woo Kim Sun-Yong Chung Department of Oriental Neuropsychiatry Dong-eui University College of Korean MedicineBusan(47227)Republic of Korea Department of Neuropsychiatry Kyung Hee University KoreanMedicine Hospital at Gangdong892 Dongnam-roGangdong-guSeoul(05278)Republic of Korea

Objective:To analyze the available data on the anti-anger effects of herbal medicines(HMs)as well as their underlying mechanisms in rat ***:From 6 electronic databases[PubMed,EMBASE,China National Knowledge Infrastructure(CNKI),Wanfang,Oriental Medicine Advanced Searching Integrated System(OASIS),and Research Information Sharing Service(RISS)],relevant animal experiments were searched by using"anger,""rats,"and"animal"as search *** last search was conducted on November 22,2019,and all experiments involving rat models of anger and treatment using HMs published until the date of the search were ***:A total of 24 studies with 16 kinds of HMs were *** studies have used the tail irritating method and"social isolation and resident intruder"method to establish anger *** to the included studies,the therapeutic mechanisms of HMs for anger regulation and important herbs by their frequency and/or preclinical evidence mainly incladed regulation of hemorheology(Bupleuri Radix,Paeoniae Radix Alba,and Glycyrrhizae Radix),regulation of sex hormones(Bupleuri Radix,Cyperi Rhizoma,and Paeoniae Radix Alba),regulation of neurotransmitters(Cyperi Rhizoma),regulation of anger-related genes(Bupleuri Radix,Glycyrrhizae Radix,and Paeoniae Radix Alba),and other ***,Liver(Gan)qi-smoothing herbs including Bupleuri Radix and Cyperi Rhizoma were the most frequently ***:This review found the frequent methods to establish an anger model,and major mechanisms of anti-anger effects of ***,some Liver qi-smoothing herbs have been frequently used to investigate the anti-anger effects of *** findings provide insight into the role and relevance of HMs in the field of anger management.

关键词： anger anger management therapy herbal medicine Korean traditional medicine

Recent advances in electronic devices for monitoring and modulation of brain

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第9期14卷 3070-3095页

作者： Yong Won kwon Yoon Sun Jun young-Geun Park Jiuk jang jang-Ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

Memristive Devices Based on Two-Dimensional Transition Metal Chalcogenides for Neuromorphic Computing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第4期14卷 29-58页

作者： Ki Chang kwon Ji Hyun Baek Kootak Hong Soo young Kim Ho Won jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34133Republic of Korea Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea UniversitySeoul 02841Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Two-dimensional(2D)transition metal chalcogenides(TMC)and their heterostructures are appealing as building blocks in a wide range of electronic and optoelectronic devices,particularly futuristic memristive and synaptic devices for brain-inspired neuromorphic computing *** distinct properties such as high durability,electrical and optical tunability,clean surface,flexibility,and LEGO-staking capability enable simple fabrication with high integration density,energy-efficient operation,and high *** review provides a thorough examination of high-performance memristors based on 2D TMCs for neuromorphic computing applications,including the promise of 2D TMC materials and heterostructures,as well as the state-of-the-art demonstration of memristive *** challenges and future prospects for the development of these emerging materials and devices are also *** purpose of this review is to provide an outlook on the fabrication and characterization of neuromorphic memristors based on 2D TMCs.

关键词： Two-dimensional materials Memristors Neuromorphic computing Artificial synapses Transition metal chalcogenides