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| 1 | Effect of Process Parameters on Porosity in Aluminum Lost Foam Process显示文摘Porosity is a main defect in aluminum alloy castings, which is also thought to be severe in aluminum alloy castingsproduced by lost foam process due to the pyrolysis of the polystyrene foam pattern during pouring. Fundamentalexperiments were carried out to evaluate the effect of process parameters such as the melt treatment, the cooling rateand the density of expanded polystyrene (EPS) foam on porosity in A356.2 bar casting. The effect of melt treatmentincluding degassing and refining was investigated. The effect of cooling rate was also evaluated by changing the moldpacking material such as the silica sand, the zircon sand and the steel shots. Gas entrapment due to the turbulentmetal flow during mold filling in conventional molding process results in porosity. Mold filling sequence in lost foamprocess is different from that in conventional molding process. The effect of molten metal flow was estimated bycomparing the density of the casting by conventional sodium silicate molding with that by lost foam process. Densitymeasurement was conducted to analyze the extent of porosity in the casting. Source of the porosity in lost foamprocess can be divided into two factors, i.e. turbulence in molten metal flow and entraining residue or gas from thepattern during pouring. | Kiyoung KIM Kyongwhoan LEE | 2005 | Journal of Materials Science & Technology2005，21，5： | 7 |
| 2 | Density and Mechanical Properties of Aluminum Lost Foam Casting by Pressurization during Solidification显示文摘孔被认为在失去的泡沫过程在流期间由于聚苯乙烯泡沫模式的热分解生产的铝合金铸造物严重,它在机械性质导致有害效果。慢团结率支持热坡度罐头原因的 gassing 大头针洞,和相对软弱的形成微收缩如果部分的轮廓复杂化在扔的失去的泡沫喂。消除孔是把高压力用于熔融的金属的方法之一喜欢在团结期间的均衡说的前进。基本实验被执行在扔的失去的泡沫在孔和 A356.2 合金酒吧的机械性质上评估外部压力的效果。团结时间和孔与在团结期间增加应用压力减少了。使用外部压力在减少是有效的孔并且增加扔的失去的泡沫的延伸。 | Bokhyun KANG Yongsun KIM Kiyoung KIM Gueserb CHO Kyeonghwan CHOE Kyongwhoan LEE | 2007 | Journal of Materials Science & Technology2007，23，6： | 5 |
| 3 | Recent advances in water-splitting electrocatalysts based on manganese oxide显示文摘The oxygen evolution reaction(OER)of electrochemical water splitting represents a source of hydrogen(H_(2))energy.Precious-metal-based RuO_(x)and IrO_(x)are expensive and degrade in the presence of electrolyte;thus,the development of low-cost and eco-friendly OER electrocatalysts is needed.This review summarizes the recent status of the nonprecious manganese metal-oxide-based electrocatalysts with reference to nanostructure,defect engineering,hybrid composite formation,and core-shell formation to achieve efficient OER performance.In particular,we focus on the strategies used to lower the onset potential and the Tafel slope of the water oxidation process.Future prospects for the development of manganese-oxide-based electrocatalysts are discussed. | Vijay SKumbhar Hyeonkwon Lee Jaeyoung Lee Kiyoung Lee | 2019 | Carbon Resources Conversion2019，2，3： | 3 |
| 4 | Inhibition of collagenase and melanogenesis by ethanol extracts of Orostachys japonicus A. Berger: possible involvement of Erk and Akt signaling pathways in melanoma cells显示文摘 | Dai Sig Im Jong-Min Lee Jongsung Lee Hye Jin Shin Kyoung Tai No See-Hyoung Park Kiyoung Kim | 2017 | Acta Biochimica et Biophysica Sinica2017，49，10： | 2 |
| 5 | Kbean:基于区块链的平台,创造一个新的艺术市场显示文摘我们热爱艺术!艺术是只有人类可以创造且欣赏的罕见形式之一。然而,艺术行业却是一个相对封闭的行业,面临着诸多的挑战。例如:1.新兴艺术家很难打人市场;2.艺术品的评价与交易缺乏透明度,这阻碍了新的市场参与者进入;3.人们一般认为单个买家负担不起艺术作品的花费,事实也的确如此;4.艺术作品的出处和交易记录缺少透明度,因此,如果想"了解内幕",则这种活动进一步限制了市场活动。 | Kiyoung Kate Nam | 2018 | 收藏2018，0，11： | 2 |
| 6 | Improvement of Kalman filters for WLAN based indoor tracking显示文摘 | Jaegeol Yim Seunghwan Jeong Kiyoung Gwon Jaehun Joo | 2009 | Expert Systems With Applications2009，，1： | 2 |
| 7 | Improvement of Kalman filters for WLAN based indoor tracking显示文摘 | Jaegeol Yim Seunghwan Jeong Kiyoung Gwon Jaehun Joo | 2010 | Expert Systems with Applications2010，37，1： | 1 |
| 8 | Continuum-based design sensitivity analysis and optimization of nonlinear shell structures using meshfree method 显示文摘 | Kiyoung Yi Choi K K Kim N H | 2006 | International Journal for Numerical Methods in Engineering2006，68，： | 1 |
| 9 | Single-port la-paroscopic repair of a perforated duodenal ulcer: intracorporeal 'cross and twine' knotting显示文摘 | Junhyun Lee Kiyoung Sung Dosang Lee | 2011 | Surgical Endoscopy2011，25，1： | 1 |
| 10 | Numerical solutions of flow past a circular cylinder at Reynolds numbers up to 160显示文摘 | Jeongyoung Park Kiyoung Kwon Haecheon Choi | 1998 | KSME International Journal1998，，6： | 1 |
| 11 | An efficient k nearest neighbor search for multivariate time series显示文摘 | Kiyoung Yang Cyrus Shahabi | 2006 | Information and Computation2006，，1： | 1 |
| 12 | Ti O2nanotubes and their application in dye-sensitized solar cells显示文摘 | Poulomi R Doohun Kiyoung L Erdmann S Patrik S | 2010 | Nanoscale2010，2，1： | 1 |
| 13 | Analysis and simulation of distortion in folding and interpolating A/D converters显示文摘 | Sotirios Limotyrakis KiYoung Nam Bruce A Wooley | 2002 | IEEE Trans Circuits and Systems--II2002，49，3： | 1 |
| 14 | Feature Subset Selection and Feature Ranking for Multivariate Time Series显示文摘 | HYUNJIN YOON KIYOUNG YANG CYRUS SHAHABI | 2005 | IEEE Transactions on Knowledge and Data Engineerin:IEEE Computer Society2005，17，9： | 1 |
| 15 | CLeVer:a Feature Subset Selection Technique for Multivariate Time Series显示文摘 | YANG KIYOUNG YOON HYUNJIN SHAHABI CYRUS | 2005 | The proceedings of the 9th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD) Hanoi Vietnam2005，2005，： | 1 |
| 16 | Corpo-rate cash holdings, foreign direct investment, and corpo-rate governance 显示文摘 | Kiyoung Chang Abbas Noorbakhsh | 2006 | Global Finance Journal2006，16，3： | 1 |
| 17 | Highly ordered nanoporous Ta 2 O 5 formed by anodization of Ta at high temperatures in a glycerol/phosphate electrolyte显示文摘 | Kiyoung Lee Patrik Schmuki | 2011 | Electrochemistry Communications2011，，6： | 1 |
| 18 | Routing straddle carriers for the loading operation of containers using a beam search algorithm 显示文摘 | KapHwan Kim KiYoung Kim | 1999 | Computers and Industrial Engineering1999，36，： | 1 |
| 19 | bcl-2 and bcl-xl are important for the induction of paclitaxel resistance in human hepatocellular carcinoma cells显示文摘 | EUNYOUNG C KIYOUNG L | 2004 | Biochemical and Biophysical Res Commun2004，315，： | 1 |
| 20 | Personal exposures to PM 2.5 and their relationships with microenvironmental concentrations显示文摘 | Soogil Lim Jeonghoon Kim Taehyun Kim Kiyoung Lee Wonho Yang Sangil Jun Seungdo Yu | 2011 | Atmospheric Environment2011，，： | 1 |
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