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Rheological Properties and MR Polishing Characteristics of Core Shell-Structured Silica-Coated CI Particles

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Journal of Iron and Steel Research International 2012年第S2期19卷 625-628页

作者： HONG Kwang-Pyo LEE Jung-Won CHOI Seung-Bok kim gun-Hee CHOI Hyoung-Jin CHO Myeong-Woo Department of Mechanical Engineering Inha University Korea Institute of Industrial Technology Department of Polymer Science and Engineering Inha University

Recently,ultra-precision polishing processes using smart materials such as magnetorheological(MR)fluids have been used for optics parts such as aspheric *** MR fluid applied in MR polishing is a phase controllable suspension comprising a mixture of CI particles and non-magnetic fluids such as mineral oil and *** fluids are a kind of smart material that can be controlled according to their flow properties such as viscosity and stiffness. Water-based MR fluids are easily oxidized if the fluids are exposed and this oxidation can bring irregular polishing results. Also,this phenomenon is one of several factors that reduce the life time of MR *** a previous work,CI particles were coated with a polymer or a composite for the improvement of dispersion stability and prevention of corrosion due to *** this study,the rheological properties such as viscosity and sedimentation of coated CI particles with silica were investigated with a rotational rheometer;MR polishing characteristics of BK7 glass were studied in order to investigate the surface *** wheel speed and magnetic field intensity were chosen as variables.

关键词： magnetorheological polishing silica viscosity surface roughness material removal

Energy Harvesting Strategy Using Piezoelectric Element Driven by Vibration Method

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Wireless Sensor Network 2010年第2期2卷 100-107页

作者： dong-gun kim So-Nam Yun Young-Bog Ham Jung-Ho Park 不详

This study demonstrates a method for harvesting the electrical power by the piezoelectric actuator from vibration energy. This paper presents the energy harvesting technique using the piezoelectric element of a bimorph type driven by a geared motor and a vibrator. The geared motor is a type of PWM controlled device that is a combination of an oval shape cam with five gears and a speed controller. When using the geared motor, the piezoelectric element is size of 36L×13W×0.6H. The output voltage characteristics of the piezoelectric element were investigated in terms of the displacement and vibration. When using the vibrator, the electric power harvesting is based on piezoelectric effect and piezoelectric vibrator consists of a magnetic type oscillator, a cantilever, a bimorph actuator and controllers. Low frequency operating technique using piezoelectric vibrator is very important because normal vibration sources in the environment such as building, human body, windmill and ship have low frequency characteristics. We can know from this study results that there are many energy sources such as vibration, wind power and wave power. Also, these can be used to the energy harvesting system using smart device like piezoelectric element.

关键词： Energy Harvester Piezoelectric Element Wind Energy Vibration Energy USN

Clinicopathological features of patients with middle third gastric carcinoma

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World Journal of Gastrointestinal Oncology 2016年第4期8卷 410-415页

作者： Jin Hong kim Jae Kyoon Joo Seong Yeob Ryu Ho gun kim Jae Hyuk Lee dong Yi kim Division of Gastroenterologic Surgery Department of Surgery Chonnam National University Medical School Department of Pathology Chonnam National University Medical School

AIM: To compared the prognosis of middle third gastric carcinoma(MGC) patients with those of patients with proximal/distal gastric carcinoma(PGC/DGC).METHODS: Of 3299 patients diagnosed with gastric carcinoma who underwent surgery at our hospital over a 15-year period, 919(27.9%) were diagnosed with MGC. For each patient, the following information was obtained from hospital records: Age, sex, tumor size, depth of invasion, histologic type, nodal involvement, extent of lymph node dissection, hepatic metastasis, peritoneal dissemination, stage at initial diagnosis, operative type, curability, and survival ***: T1 category tumors were more common in patients with MGC than in patients with PGC(P < 0.001). Tumor stage(stage Ⅰ), N category(N0), and T category(T1) significantly influenced the 5-year survival rates for patients with curatively resected tumors. A multivariate analysis showed that age, tumor size, serosal invasion, lymph node metastasis, and curability were significant predictors of survival in patients with MGC. The survival rate for MGC patients was similar to that for PGC/DGC patients(52.8% vs 44.4%/51.4%, P = 0.1138). The 5-year survival rate for MGC patients with curative resection was higher than that for MGC patients with non-curative resection(62.9% vs 8.7%, P < 0.001).CONCLUSION: These results indicate that tumor location did not affect the prognosis. Curative resection is important for improving the prognosis of patients with MGC.

关键词： Middle third gastric carcinoma Prognosis Curative resection

A Web-based machining process monitoring system for E-manufacturing implementation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1467-1473页

作者： SHIN Bong-cheol kim gun-hee CHOI Jin-hwa JEON Byung-cheol LEE Honghee CHO Myeong-woo HAN Jin-yong PARK dong-sam Division of Mechanical Engineering Inha University Incheon 402-751 Korea Department of Mechanical Engineering University of Incheon Incheon 402-749 Korea

Recently, with the rapid growth of information technology, many studies have been performed to implement Web-based manufacturing system. Such technologies are expected to meet the need of many manufacturing industries who want to adopt E-manufacturing system for the construction of globalization, agility, and digitalization to cope with the rapid changing market requirements. In this research, a real-time Web-based machine tool and machining process monitoring system is developed as the first step for implementing E-manufacturing system. In this system, the current variations of the main spindle and feeding motors are measured using hall sensors. And the relationship between the cutting force and the spindle motor RMS (Root Mean Square) current at various spindle rotational speeds is obtained. Thermocouples are used to measure temperature variations of important heat sources of a machine tool. Also, a rule-based expert system is applied in order to decide the machining process and machine tool are in normal conditions. Finally, the effectiveness of the developed system is verified through a series of experiments.

关键词： E-manufacturing Web-based system Internet Machining process monitoring Expert system

A Web-based on-machine mould matching and measurement system based on CAD/CAM/CAI integration

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1474-1481页

作者： CHOI Jin-hwa JEON Byung-cheol kim gun-hee SHIN Bong-cheol LEE Honghee CHO Myeong-woo SEONG Eun-je PARK dong-sam Division of Mechanical Engineering Inha University Incheon 402-751 Korea Department of Mechanical Engineering University of Incheon Incheon 402-749 Korea

The purpose of this study is to develop a Web-based on-machine mould identification and measurement system. The Web-based mould identification system matches obtained vision information with CAD database. Developed Web-based system is to exchange messages between a server and a client by making of ActiveX control, and the result of mould identification is shown on Web-browser at remote site. For effective feature classification and extraction, the signature method is used to make meaningful information from obtained image data. For on-machine measurement of the matched mould, inspection database is constructed from CAD database using developed inspection planning methods. The results are simulated and analyzed using developed system to verify the effectiveness of the proposed methods.

关键词： E-manufacturing CAD/CAM/CAI integration On-machine measurement Mould identification Vision system

Conceptual Modeling of Contaminated Solute Transport Based on Stream Tube Model

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Advances in Chemical Engineering and Science 2012年第4期2卷 481-489页

作者： Seung-gun Chung Soon-Jae Lee dong-Ju kim Sang-Hyup Lee Jae-Woo Choi Center for Water Resource Cycle Research Korea Institute of Science and Technology Seoul Republic of Korea Department of Earth and Environmental Sciences College of Science Korea University Seoul Republic of Korea

In this study, we performed a conceptual modeling on solute transport based on theoretical stream tube model (STM) with various travel time distributions assuming a pure convective flow through each tube in order to investigate how the lengths and distributions of solute travel time through STM affect the breakthrough curves at the end mixing surface. The conceptual modeling revealed that 1) the shape of breakthrough curve (BTC) at the mixing surface was determined by not only input travel time distributions but also solute injection mode such as sampling time and pulse lengths;2) the increase of pulse length resulted in the linear increase of the first time moment (mean travel time) and quadratic increase of the second time moment (variance of travel time) leading to more spreading of solute, however, the second time moment was not affected by travel time distributions and 3) for a given input distributions the increase in travel distance resulted in more dispersion with the quadratic increase of travel time variance. This indicates that stream tube model obeying strictly pure convective flow follows the concept of convective-lognormal transport (CLT) model regardless the input travel time distributions.

关键词： Conceptual Modeling Solute Transport Pure Convective Flow Stream Tube Model Travel Time Distribution

Direct synthesis of highly conductive poly（3,4- ethylenedioxythiophene）：poly（4-styrenesulfonate）（PEdoT：PSS）/graphene composites and their applications in energy harvesting systems

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Nano Research 2014年第5期7卷 717-730页

作者： dohyuk Yoo Jeonghun kim Jung Hyun kim Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou1120-749 Republic of Korea Electronic Materials Division R&D Center Dongjin Semichem Co. Ltd. 625-3 Yodang-Ri Yanggam-Myeon Hwaseong-Gun Gyeonggi-Do Republic of Korea

We report for the first time highly conductive poly（3,4-ethylenedioxythiophene）： poly（4-styrenesulfonate）（PEdoT：PSS）/graphene composites fabricated by in situ polymerization and their applications in a thermoelectric device and a platinum （Pt）-free dye-sensitized solar cell （DSSC） as energy harvesting systems. Graphene was dispersed in a solution of poly（4-styrenesulfonate）（PSS） and polymerization was directly carried out by addition of 3,4-ethylenedioxythiophene （EdoT） monomer to the dispersion. The content of the graphene was varied and optimized to give the highest electrical conductivity. The composite solution was ready to use without any reduction process because reduced graphene oxide was used. The fabricated film had a conductivity of 637 ***-1, corresponding to an enhancement of 41%, after the introduction of 3 wt.% graphene without any further complicated reduction processes of graphene being required. The highly conductive composite films were employed in an organic thermoelectric device, and the device showed a power factor of 45.7 μW·m^-1K^-2 which is 93% higher than a device based on pristine PEdoT：PSS. In addition, the highly conductive composite films were used in Pt-free DSSCs, showing an energy conversion efficiency of 5.4%, which is 21% higher than that of a DSSC based on PEdoT：PSS.

关键词： direct synthesis conductive polymer graphene composite thermoelectric material dye-sensitized solar cell

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基于三分量法的地下金属管线探测仪结构设计

科技和产业 2021年第1期21卷 171-174页

作者：陈旭 kim gun-hoi 全州大学机械与汽车工程系韩国全州430074

目前现有的探测器工作原理多数是通过电场源激励接收电磁波信号,电场和磁场的分布是结构设计的理论前提,因此分析电性分布参数与地下管线在探测技术中的作用和影响,建立数学模型剖析载流导体与周围环境电性参数的关系,通过空间三维向量... 详细信息

目前现有的探测器工作原理多数是通过电场源激励接收电磁波信号,电场和磁场的分布是结构设计的理论前提,因此分析电性分布参数与地下管线在探测技术中的作用和影响,建立数学模型剖析载流导体与周围环境电性参数的关系,通过空间三维向量磁场强度分布情况设计了线圈搭建的模型与接收器在二维空间的结构设计,组成双球面空间结构。针对磁场强度分布不平衡性,用数学模型作为理论依据,提出一种新型结构进行补偿,进一步提高定位精度。

关键词：地下金属管线三分量法电性分布参数接收器结构设计

CREEP BEHAVIOR OF Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu ALLOY

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Acta Mechanica Solida Sinica 2008年第4期21卷 308-311页

作者： Ji Young kim Kwang Su Na Yong Duck kim Ji Hui kim Kwon Yeong Lee Ki Nam kim Seon Jin kim Division of Advanced Materials Science and Engineering Hanyang University133-791Korea Technical Research Center Sheet Products Design TeamHyundai Steel CompanyKodae-RiSongak-MyeonDangjin-GunChungnam167-32Korea

Creep behavior of the Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu alloy sheet is investigated from 300℃ to 400℃ in the stress range from 50 MPa to 180 MPa along the rolling direction. The measured strain rates range from 8.8 × 10^-10 s^-1 to 4.7 × 10^-7 s^-1. The activation energies are estimated to assess the creep deformation mechanisms in this alloy. The strain rate is slightly different at low stress, while it shows a distinct difference at high stresses. Stress exponents of this alloy increase with increasing applied stress at all testing temperatures. It is concluded that the creep deformation of the Zr-1.5Nb-0.4Sn-0.1Fe-0. 1 Cu alloy is controlled by the diffusion creep at low stress region and by the climbing of dislocations at high stress region.

关键词： creep zirconium alloy nuclear cladding