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| 1 | Phase stability and mechanical properties of wire+arc additively manufactured H13 tool steel at elevated temperatures显示文摘Wire+arc additive manufacturing(WAAM)is considered an innovative technology that can change the manufacturing landscape in the near future.WAAM offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium-and large-sized parts such as die-casting tools.In this study,AISI H13 tool steel,a popular die-casting tool metal,is manufactured by cold metal transfer(CMT)-based WAAM and is then comprehensively analyzed for its microstructural and mechanical properties.Location-dependent phase combinations are observed,which could be explained by nonequilibrium thermal cycles that resulted from the layer-by-layer stacking mechanism used in WAAM.In addition,remelting and reheating of the layers reduces welding anomalies(e.g.,pores and voids).The metallurgical characteristics of the H13 strongly correlate with the mechanical properties.The combinations of phases at different locations of the additively manufactured part exhibit a periodic microhardness profile.Martensite,Retained Austenite,Ferrite,and Carbide phases are found in combination at different locations of the part based on the part’s temperature distribution during additive deposition.Moreover,the tensile properties at elevated temperatures(23℃,300℃,and 600℃)are comparable to those from other WAAM and additive manufacturing(AM)processes.The X-ray diffraction results verify that the microstructural stability of the fabricated parts at high temperatures would allow them to be used in high temperatures. | A.N.M.Tanvir Md.R.U.A hsan Gijeong Seo Brian Bates Chanho Lee Peter K.Liaw Mark Noakese Andrzej Nycz Changwook Ji Duck Bong Kim | 2021 | Journal of Materials Science & Technology2021，，8： | 5 |
| 2 | An efcient GP approach to recognizing cognitive tasks from fNIRS neural signals显示文摘This paper presents a new genetic programming(GP)approach to accurately classifying cognitive tasks from non-stationary and noisy fNIRS neural signals.To this end,a new GP that efectively handles multiclass problems is developed.In accordance with multi-tree structure,GP operators are innovated:crossover exchanges every subtree of parents without sufering from any incongruity problem and mutation fne-tunes candidate solutions by a less destructive process.Experimental results verifes the efectiveness of the proposed GP classifer over existing references. | AN Jinungn LEE JongHyun AHN ChangWook | 2013 | Science China(Information Sciences)2013，56，10： | 3 |
| 3 | Modeling and Analysis of Power Supply Noise Imbalance on Ultra High Frequency Differential Low Noise Amplifiers in a System-in Package显示文摘 | Kyoungchoul Koo Yujeong Shim Changwook Yoon etc | 2010 | IEEE Transaction on Advanced Packaging2010，33，3： | 1 |
| 4 | A practical approach to project scheduling:considering the potential quality loss cost in the time-cost tradeoff problem显示文摘 | JongYul Kim ChangWook Kang | | 0，，05： | 1 |
| 5 | Magnetic nanoparticles and microNMR for diagnostic applications显示文摘 | Huilin Shao Changwook Min David Issadore | | 0，，01： | 1 |
| 6 | Structure of a peptide : N-glycanase-Rad23 complex : Insight into the deglycosylation for denatured glycoproteins 显示文摘 | Jung-Hoon Lee Jung Min Choi Changwook Lee | 2005 | PNAS2005，，102： | 1 |
| 7 | Electronic structure tailoring and selective adsorption mechanism of metal-coated nanotubes显示文摘 | Youngmi Cho Changwook Kim Heesung Moon | 2008 | Nano Lett2008，8，1： | 1 |
| 8 | Nonlinear channel blind equalization using hybrid genetic algorithm with simulated annealing显示文摘 | Soowhan H Pedrycz W Changwook H | 2005 | Mathematical and Computer Modeling2005，41，34： | 1 |
| 9 | Measurement of the mechanical properties of electroplated gold thin films using micromachined beam structures 显示文摘 | Baeka Changwook Kima Yongkweon Ahnb Yoomin | 2005 | Sensors and Actuators A2005，11，7： | 1 |
| 10 | Microstructures and mechanical behavior of the bimetallic additively-manufactured structure(BAMS)of austenitic stainless steel and Inconel 625显示文摘Bimetallic additively manufactured structures(BAMSs)can replace traditionally-fabricated functionallygraded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing.The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding(GMAW)-based wire+arc additive manufacturing(WAAM)system.Elemental mapping shows a smooth compositional transition at the interface without any segregation.Both materials being the face-center-cubic(FCC)austenite,the electron backscattered diffraction(EBSD)analysis of the interface shows the smooth and cross-interfacecrystallographic growth of long-elongated grains in the<001>direction.The hardness values were within the range of 220-240 HV for both materials without a large deviation at the interface.Due to the controlled thermal history,mechanical testing yielded a consistent result with the ultimate tensile strength and elongation of 600 MPa and 40%,respectively,with the failure location on the stainless-steel side.This study demonstrates that WAAM has the potential to fabricate BAMS with controlled properties. | Md.R.U.Ahsan Xuesong Fan Gi-Jeong Seo Changwook Ji Mark Noakes Andrzej Nycz Peter KLiaw Duck Bong Kim | 2021 | Journal of Materials Science & Technology2021，，15： | 1 |
| 11 | Design of a low-noiee UWB transceiver sip 显示文摘 | YOON Changwook LEE Junwoo | 2008 | Design and Test of Computers2008，25，1： | 1 |
| 12 | An analysis of the M/G/1 system with and policy显示文摘 | Hur Sun Kim Jongsoo Kang Changwook | 2003 | Applied Mathematical Modeling2003，27，： | 1 |
| 13 | Opti- mum RCS depressurization strategy for effective severe accident management of station black out accident显示文摘 | CHANGWOOK H SUH N PARK G C | 2009 | Nucl Eng Des2009，239，11： | 1 |
| 14 | Nonlinear channel blind equalization using hybrid genetic algorithm with simulated annealing显示文摘 | H Soowhan W Pedryez H Changwook | 2005 | Mathematical and Computer Modeling2005，41，34： | 1 |
| 15 | An analysis of the M/G/1 system with N and T policy显示文摘 | Sun Hur Jongsoo Kim Changwook Kang | 2003 | Applied Mathematical Modelling2003，27，： | 1 |
| 16 | An analysis of the M/G/1 system with N and T policy显示文摘 | Hut Sun Kim Jongsoo Kang Changwook | 2003 | Applied Mathematical Modeling2003，27，： | 1 |
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