检索结果-南通市图书馆

Journal of Central South University 2012年第8期19卷 2386-2393页

作者： KIM Seong-rae sunG Ki-deug LEE Dong-woo huh sun-chul NEXEN Tire Corporation 30 Yusan-DongYangsan-SiKyungnam 626-230Korea Division of Automotive and Mechanical Engineering Changwon Moonsung University91Doodae-dongChangwon-si Kyungnam 641-771Korea Department of Energy and Mechanical Engineering Institute of Marine IndustryGyeongsang National University Cheondaeguk-Gil 38TongyeongGyeongnam 650-160Korea

Cavity resonance noise of passenger car tires is generated by interacting excitation between a tire structure and the fill gas (air), and generally lies in a frequency range of 200?250 Hz. As such, this noise is strongly perceived and may be a serious source of driver annoyance. Thus, many studies regarding the cavity noise mechanism and its reduction have already been conducted. In this work, a vibro-acoustic coupled analysis was conducted between a tire structure and air cavity. Using this analysis, we can more accurately simulate the tire noise performance in the region of the cavity resonance frequency. An analysis of the effects of variation of tire contour design factors was conducted, using design-of-experiments methods. Finally, a multi-objective optimization was performed using in-house codes to reduce the cavity noise level while minimizing the loss of other performances, such as diminished ride comfort and handling caused by the variations of contour. As a result of this optimization, an optimized contour shape was derived, which satisfied the multi-objective performances.

关键词： tire cavity noise vibro-acoustic coupled analysis finite element method boundary element method (BEM) sensitivity optimization

Dual probiotic strains suppress high fructose-induced metabolic syndrome

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第2期19卷 274-283页

作者： Do-Young Park Young-Tae Ahn chul-sung huh Robin A McGregor Myung-Sook Choi Korea Yakult Co. Ltd.YonginGyeonggi 449-901South Korea Department of Food Science and Nutrition Center for Food and Nutritional GenomicsKyungpook National UniversityDaegu 702-701South Korea

AIM:To investigate the effect of novel probiotics on the clinical characteristics of high-fructose induced metabolic ***:Male Wistar rats aged 4 wk were fed a 70% w/w high-fructose diet(n = 27) or chow diet(n = 9) for 3 wk to induce metabolic syndrome,the rats were then randomized into groups and administered probiotic [Lactobacillus curvatus(***) HY7601 and Lactobacillus plantarum(***) KY1032] at 109 cfu/d or 1010 cfu/d or placebo by oral gavage for 3 *** intake and body weight were measured once a *** 6 wk,the rats were fasted for 12 h,then anesthetized with diethyl ether and *** samples were taken from the inferior vena cava for plasma analysis of glucose,insulin,C-peptide,totalcholesterol,triglycerides and thiobarbituric acid-reacting ***-time polymerase chain reaction was performed using mouse-specific Taqman probe sets to assess genes related to fatty acid β-oxidation,lipogenesis and cholesterol metabolism in the *** gene expression was normalized to the housekeeping gene,glyceraldehyde-3-phosphate ***:Rodents fed a high-fructose diet developed clinical characteristics of the metabolic syndrome including increased plasma glucose,insulin,triglycerides,total cholesterol and oxidative stress levels,as well as increased liver mass and liver lipids compared to chow fed *** treatment(*** HY7601 and *** KY1032) at high(1010 cfu/d) or low dosage(109 cfu/d) lowered plasma glucose,insulin,triglycerides and oxidative stress *** high-dose probiotic treatment reduced liver mass and liver *** treatment reduced lipogenesis via downregulation of SREBP1,FAS and SCD1 mRNA levels and increased β-oxidation via up-regulation of PPARα and CPT2 mRNA ***:Probiotic *** HY7601 and *** KY1032 combined suppressed the clinical characteristics of high-fructose-induced metabolic syndrome,therefore,may provide a natura

关键词： Dyslipidemia Fasting glucose Gut microbiota High-fructose diet Inflammation Insulin resistance Lactobacillus Metabolic syndrome Oxidative stress Probiotic

EVALUATION OF DUCTILE FRACTURE CRITERIA IN A GENERAL THREE-DIMENSIONAL STRESS STATE CONSIDERING THE STRESS TRIAXIALITY AND THE LODE PARAMETER

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2013年第6期26卷 642-658页

作者： Yanshan Lou Hoon huh School of Mechanical Aerospace and Systems EngineeringKAIST335GwahangnoDaeduk Science TownDaejeon305-701South Korea

This paper is concerned with evaluation of various ductile fracture criteria in a general three-dimensional stress state of stress triaxiality, the Lode parameter and the equiva- lent plastic strain to fracture. Evaluation is carried out by comparing fracture loci constructed by fracture criteria to experimental results of A12024-T351. Comparison demonstrates that the Modified Mohr-Coulomb criterion and a newly proposed criterion provide sufficient predictabil- ity of fracture strain. Moreover, evaluation is emphasized on the predicted cut-off value for stress triaxiality. The evaluation demonstrates that the Cockcroft-Latham, Brozzo, Oh, Ko-huh and the new criteria coupled a reasonable cut-off value for ductile materials.

关键词： fracture alloys ductile material fracture locus metal forming

Mechanical properties of Cu matrix composite fabricated by extrusion process

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2679-2686页

作者： Ji-Hun PAK Gwi-Nam KIM sung-Gu HWANG Beom-Su KIM Jung-Pil NOH sun-chul huh Department of Mechanical and Precision Engineering Gyeongsang National University Department of Mechanical System Engineering Gyeongsang National University Department of Mechanical and Energy Engineering Gyeongsang National University

Carbon nanotube （CNT）was applied in various fields for itssuperior electrical, mechanical and thermal characteristics. After composites were fabricated by extrusion processusing ball-milledCu-CNT powders, mechanicalpropertiesofCu-CNT composites according to CNT fraction were reviewed. CNT （1%, 5% and 10%）,Cu （d=100 nm）, zirconia balls （90 g） and ethanol （20mL） were mixed and dispersed for5h at a speed of 500 r/minusing a planetary ball mill. A billet （d=50 mm, length=100 mm） was made with Cu, and the composite powderswerefilled up into billet using the uni-axial press. In the extrusion process, after the billet was heated at 880℃for1h, specimens were produced in the shape of a round bar using the billet by applying a load of 200 t. The composite powdersweremeasured for particle size byparticlesize distributionequipment. Then the specimen surface fabricated by extrusion was observed by SEM. Mechanicalpropertiesmeasured by the indentation equipment increased with increasing CNT content. The yield strength, tensile strength and hardness of theCu–CNTs composites canbeobviously improved.

关键词： extrusion milling indentation matrix mechanical properties microstructure

在线全文

学校读者我要写书评

暂无评论

对韩国第七次课程修订的反思与展望

教育发展研究 2005年第19期25卷 35-39页

作者： Kyung-chul huh 韩国课程与评价研究所

1997年由韩国教育部发布的第七次修订课程正在进行新一轮修订,预期在今年12月份推出修订草案.本文将着重讨论以下三个方面的问题:第七次修订课程的问题何在,为什么要对当前的课程进行修订,以及未来新课程将想什么方向发展变化.但在对上... 详细信息

1997年由韩国教育部发布的第七次修订课程正在进行新一轮修订,预期在今年12月份推出修订草案.本文将着重讨论以下三个方面的问题:第七次修订课程的问题何在,为什么要对当前的课程进行修订,以及未来新课程将想什么方向发展变化.但在对上述问题展开讨论之前,有必要先对第七次修订课程的基本内容、主要特点、修订程序等进行一个简要的介绍.

关键词：课程开发研究所韩国语韩语学校课程学科内容差异课程社会服务活动研究与发展研究与开发教育部教育行政组织普通教育入学考试小学一年级教学标准高中阶段学程学生群体生涯定向

Universal bound on sampling bosons in linear optics and its computational implications

在线全文

学校读者我要写书评

暂无评论

National Science Review 2019年第4期6卷 719-729页

作者： Man-Hong Yung Xun Gao Joonsuk huh Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Central Research Institute Huawei Technologies Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua University Department of Chemistry Sungkyunkwan University

In linear optics, photons are scattered in a network through passive optical elements including beam splitters and phase shifters, leading to many intriguing applications in physics, such as Mach–Zehnder interferometry, the Hong–Ou–Mandel effect, and tests of fundamental quantum mechanics. Here we present the fundamental limit in the transition amplitudes of bosons, applicable to all physical linear optical networks. Apart from boson sampling, this transition bound results in many other interesting applications,including behaviors of Bose–Einstein condensates(BEC) in optical networks, counterparts of Hong–Ou–Mandel effects for multiple photons, and approximating permanents of matrices. In addition,this general bound implies the existence of a polynomial-time randomized algorithm for estimating the transition amplitudes of bosons, which represents a solution to an open problem raised by Aaronson and Hance(Quantum Inf Comput 2012; 14: 541–59). Consequently, this bound implies that computational decision problems encoded in linear optics, prepared and detected in the Fock basis, can be solved efficiently by classical computers within additive errors. Furthermore, our result also leads to a classical sampling algorithm that can be applied to calculate the many-body wave functions and the S-matrix of bosonic particles.

关键词： boson sampling quantum optics quantum supremacy linear optics computational complexity

Management of Schemes and Threat Prevention in ICS Partner Companies Security

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第12期69卷 3659-3684页

作者： Sangdo Lee Jun-Ho huh Cyber Security Center Korea Midland Power Co.Ltd.BoryeongKorea Department of Data Informatics (National)Korea Maritime and Ocean UniversityBusanKorea

An analysis of the recent major security incidents related to industrial control systems,revealed that most had been caused by company ***,enterprise security management systems have been developed to focus on companies’***,several hacking incidents,involving major companies and public/financial institutions,were actually attempted by the cooperative firms or the outsourced manpower undertaking maintenance ***,institutions that operate industrial control systems(ICSs)associated with critical national infrastructures,such as traffic or energy,have contracted several cooperative ***,ICT’s importance is gradually increasing,due to outsourcing,and is the most vulnerable factor in *** paper proposes a virtualized security management scheme for the resident cooperative firms in the industrial control *** such companies often cannot afford adequate investment in security,the scheme is to let an ICS company provide the virtualized *** of its merits is the convenience of controlling a VDI server at the *** cooperative firms were classified,based on their respective security levels,and statistics were collected throughout a four-year period for the *** paper analyzes the policies and virtualization systems that have been applied to the security of the partner companies,which engaged in ICS security.A suitable model for ICS security was then proposed by analyzing their effects on the system efficiencies,based on the comparisons of the security inspection results obtained before and after *** proposed system is expected to contribute to industrial safety.

关键词： Nuclear power plant nuclear power plant security virtual machine SCADA ICS ISO27001 VDI based security software engineering

Microperimetry and spectral domain optical coherence tomography in myelinated retinal nerve fibers

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第1期9卷 170-172页

作者： Kyung Ho Lee Seong-Woo Kim Soon-sun Kwon Jaeryung Oh Kuhl huh Department of Ophthalmology Korea University College of Medicine Biomedical Research Institute Seoul National University Bundang Hospital

Dear Sir,I write to present the correlation between microperimetric （MP） values and the density of myelinated retinal nerve fibers （MNFs） in optical coherence tomography （OCT） imaging.

关键词： Microperimetry and spectral domain optical coherence tomography in myelinated retinal nerve fibers OS Figure line

Globally generated vector bundles on a smooth quadric surface

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2015年第3期58卷 633-652页

作者： BALLICO Edoardo huh Sukmoon MALASPINA Francesco Department of Mathematics Università di Trento Department of Mathematics Sungkyunkwan University Department of Mathematical Science Politecnico di Torino

We give the classification of globally generated vector bundles of rank 2 on a smooth quadric surface with c1(2,2)in terms of the indices of the bundles,and extend the result to arbitrary higher rank *** also investigate their indecomposability and give the sufficient and necessary condition on numeric data of vector bundles for indecomposability.

关键词： higher rank vector bundles globally generated smooth quadric surface

Characteristics and Application of Conducting Polymer Sensor

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A03期35卷 479-482页

作者： Joon-Boo Yu Jeung-Soo huh Department of Material Science and Metallurgy Kyungpook National UniversityDaegu 702-701Korea

Conducting polymers sensors have been very interesting that it can detect wide variety of functionalities,however these materials have to solve humidity contaminant,poor reversibility and *** improve this problems,we investigated pretreatment such as soaking in methanol and thermal treatment in N_*** process improved stability, reversibility and response time and recovery *** overcome humidity contaminant coated hydrophobic polymer was reduced above 50% at RH10%.For sensor array structure was fabricated for enhancing selectivity of gas *** polymer sensor array had several application in environmental and medical science the method of principal component analysis.

关键词： conducting polymer VOCs gas sensor