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계면 스위칭 멤리스터 소자 구조와 신경망 회로 성능에 대한 시뮬레이션 연구
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송윤혁, 임지민, Sagar Khot, 정동명, 권용우
Korean J. Met. Mater.
2024;62(3):212-221. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.212
Abstract
In this study, the architecture of an interfacial switching memristor, which has a metal-insulatormetal structure of Pt/SrTiO
3
/Nb-SrTiO
3
was investigated. The performance of a neural network that uses memristors as its synapse components was also examined with system-level simulations. A finite element solver, COMSOL Multiphysics, was used to simulate synaptic device.....
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COMSOL을 활용한 신 마그네슘 전해 공정 수치해석 모델 개발
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조매현, 정형준, 강정신, 장근옥
Korean J. Met. Mater.
2023;61(8):625-631. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.625
Abstract
Magnesium (Mg) has good physical properties including light weight, excellent specific strength and high stiffness, and Mg is used in many fields. But current production methods of Mg have disadvantages, such as the generation of sulfur oxide and chlorine gas. In this situation, The Korea Institute of Geoscience and Mineral.....
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전로 제강 공정에서 초음속 산소 랜스가 2차 연소에 미치는 영향 - 전로 모사 가스 반응로 실험 및 해석
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이지아, 하창수, 한정환
Korean J. Met. Mater.
2023;61(7):514-523. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.514
Abstract
Employing post-combustion technology in the converter, using the sensible heat of the hot metal and the oxidation reaction heat as a heat source, is known to compensate for insufficient heat in the converter process. However, most studies on post-combustion have been conducted using subsonic nozzles, whereas actual converter processes use.....
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STS 316L/A516-70N 클래드 판재의 용접방법에 따른 열영향부 형성과 기계적 물성 특성 평가 및 예측
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황철홍, 조명우, 김선환, 한두희, 유경훈, 김성웅, 김영주, 이상엽, 박준식
Korean J. Met. Mater.
2022;60(12):873-883. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.873
Abstract
Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and FCAW + GTAW (Gas tungsten arc welding) were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the welding speed of the FCAW + GTAW welding method is slower than that of the FCAW + FCAW.....
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Web of Science 3
Crossref 4
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탄점소성 다결정 모델을 활용한 삼축성 예측 및 검증
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박진화, 정영웅
Korean J. Met. Mater.
2022;60(8):607-618. Published online 2022 Jul 19
DOI:
https://doi.org/10.3365/KJMM.2022.60.8.607
Abstract
The ΔEVPSC numerical code based on the elasto-visco-plastic HEM (Homogeneous Effective Medium) provides a multiscale constitutive modeling framework that is suitable for describing a wide range of mechanical behaviors of polycrystalline metals. In this study, an AA6061-T6 aluminum sample was chosen to validate the predictive capability of the ΔEVPSC stand-alone.....
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Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
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김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater.
2021;59(12):893-903. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.893
Abstract
This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection.....
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매트랩/시뮬링크 simulation model을 이용한 열전 모듈의 효율 예측
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이나영, 예성욱, Rahman Jamil Ur, 탁장렬, 조중영, 서원선, 신원호, Walter Commerell, 남우현, 노종욱
Korean J. Met. Mater.
2021;59(11):829-837. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.829
Abstract
Development new high-performance thermoelectric materials for more efficient power generation systems and eco-friendly refrigerating systems has been challenging. Over the past few decades, thermoelectric studies have been focused on increasing the thermoelectric properties of materials. However, for conventional applications, developing of thermoelectric devices or modules with lower cost and.....
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Crossref 1
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적층제조 공정으로 구현된 형상 적응형 냉각채널 적용 다이캐스팅 금형의 냉각성능 평가
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박유진, 김억수, 이정훈, 최지환, 윤필환, 강호정, 김동현, 박용호, 고종완
Korean J. Met. Mater.
2021;59(9):652-663. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.652
Abstract
A cooling channel with an optimized design provides not only high throughput with gravity die casting, but also guarantees product quality. A conformal cooling channel (CC) whose structure follows the shapes or surfaces of the mold cavity has attracted great attention in the die casting industry, because it allows rapid.....
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Web of Science 2
Crossref 2
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유한요소해석을 활용한 다공 금속의 구조-물성 관계 연구
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정동명, 권용우
Korean J. Met. Mater.
2019;57(11):747-754. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.747
Abstract
A porous material can be regarded as a mixture of pores and solid phases, with effective thermal and mechanical properties that significantly differ from those of its base material. Material effective properties depend greatly on the structure and porosity. The effective properties of materials with different pore structures can vary.....
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Crossref 1
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페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
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정지영, 송동준, 최지혜, 정중희, 홍기하
Korean J. Met. Mater.
2019;57(8):535-542. Published online 2019 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.535
Abstract
We investigated the effects of materials and the film thickness of hole transport layers (HTLs) on inverted type perovskite solar cells using optics-charge transport coupled simulations. Power conversion efficiencies (PCEs), and the variations in efficiency induced by the film thickness dispersion, were intensively studied, to compare potential HTLs candidates like.....
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Web of Science 3
Crossref 3
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Korean J. Met. Mater.
2019;57(7):462-467. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.462
Abstract
In this work, the angular distribution of the sputtered Cu flux in a long throw sputtering (LTS) system is extracted from the comparison of experimentally-measured profiles of deposited films with simulated profiles of films in overhang contact structure. And effects of the sputtering process parameters such as Ar pressure during.....
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Web of Science 1
Crossref 1
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9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
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문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater.
2019;57(7):422-429. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.422
Abstract
Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M
23
C
6
. Nitrogen was reduced from 0.04 to.....
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Web of Science 1
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Korean J. Met. Mater.
2019;57(2):115-123. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.115
Abstract
The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process,.....
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백종원, 오주원, 정제숙, 조용석, 박성진
Korean J. Met. Mater.
2019;57(1):43-50. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.43
Abstract
Compact Endless cast and rolling Mill (CEM) processes were developed and used to fabricate steel products such as steel slabs. However, the coiling furnace in this process was very expensive, so a new layout was suggested. As the coiling furnace was removed, the interval among the slab heaters had to.....
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Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2018;56(5):384-391. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.384
Abstract
The methane reduction (MR) of SnO
2
has been proposed as a highly efficient method for recovering Sn from SnO
2
containing industrial wastes. The MR of SnO
2
also produces a mixture of H
2
and CO, which can be further utilized as a syngas for the production of various fuels through the.....
More
Crossref 2
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금속·재료 분야 전산재료과학 사용설명서
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이병주
Korean J. Met. Mater.
2018;56(4):253-264. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.253
Abstract
Computational approaches such as first-principles calculations, atomistic simulations, phase field simulations, computational thermodynamics and finite element method simulations are widely used in the metals and materials community. Even with their successful applications for better understanding of material phenomena, and the design of new materials or processes, a gap remains between.....
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고 출력, 멀티 칩 LED 벌브에서 방열 거동 해석
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문철희
Korean J. Met. Mater.
2018;56(3):227-234. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.227
Abstract
To ensure the reliability of high-power light-emitting diode (LED) bulbs, temperature management is very important, including reduction of the junction temperature on the LED chip and enhancing outward thermal dissipation. Simulation can be an effective tool for predicting the temperature distribution over all bulbs, which enables a quantitative analysis. In.....
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Crossref 1
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장입 슈트 형태에 따른 소결 원료 장입 거동
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김강민, 이기우, 권재홍, 정해권, 한정환
Korean J. Met. Mater.
2017;55(12):896-904. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.896
Abstract
In the iron ore sintering process, a thermal imbalance can occur in the sinter feed bed which degrades the quality of the sintered ores. In order to solve this thermal imbalance, it is necessary to control the sizes of the sintering feed charging through the chute by designing an appropriate.....
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Korean J. Met. Mater.
2017;55(11):760-767. Published online 2017 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2017.55.11.760
Abstract
The material characterization of single crystalline Cu columns was numerically carried out at the submicroscopic level. A molecular dynamics (MD) simulation was employed using the embedded-atom method (EAM) interatomic potential between a pair of Cu atoms to describe the interactions among Cu atoms. First, the relationship between mechanical properties and.....
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Crossref 1
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마그네슘 합금 박육 부품 다이캐스팅 주조시 오버플로우 형상 및 주입속도가 주조 품질에 미치는 영향
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권의혁, 권재홍, 김병철, 한정환
Korean J. Met. Mater.
2017;55(7):515-522. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.515
Abstract
Casting defects such as gas traps and oxide particles must be removed in the die-casting process in order to obtain good cast products. Experimental research is costly and time-consuming, so computer simulations are typically performed in advance and then compared to experimental results. In this paper, a magnesium alloy die-casting.....
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변형된 사각 루프 주파수 선택 표면의 인덕턴스, 커패시턴스 계산 및 전파흡수특성
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류전, 김성수
Korean J. Met. Mater.
2017;55(6):412-418. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.412
Abstract
The square loop (SL) is the typical pattern of a frequency selective surface (FSS) with high inductance (L) and capacitance (C). In this study, modified patterns including split square loop FSS (SSL-FSS) and I-type FSS (I-FSS) are proposed, and their L and C values were estimated using the equivalent circuit.....
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Crossref 1
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Korean J. Met. Mater.
2017;55(3):202-208. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.202
Abstract
Computational fluid dynamic modeling of a continuous rheo-casting technology was conducted, consistent with the manufacturing of 3
mm
-thin plates made of aluminum alloy A356. The A numerical simulation on of the stabilizing time of the material crystallization was carried out using the ANSYS FLUENT code. Solidification and melting models were.....
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새로운 EUV 흡수체 연구：니켈 & 니켈 산화물
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우동곤, 김정환, 김정식, 홍성철, 안진호
Korean J. Met. Mater.
2017;55(3):198-201. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.198
Abstract
The shadowing effect is one of the most urgent issues yet to be solved in high-volume manufacturing using extreme ultraviolet lithography (EUVL). Many studies have been conducted to mitigate the unexpected results caused by shadowing effects. The simplest way to mitigate the shadowing effect is to reduce the thickness of...
More
Crossref 1
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극자외선 노광공정에서의 사이드 로브 세기와 포톤 샷 노이즈 효과가 컨택 홀 missing 현상에 미치는 영향
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김정식, 홍성철, 장용주, 안진호
Korean J. Met. Mater.
2017;55(2):139-143. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.139
Abstract
The missing hole phenomenon in a wafer pattern is a critical issue in extreme ultraviolet lithography. It occurs randomly, even when the process conditions are consistent. The main reason for this phenomenon is thought to be the photon shot noise effect, which is a random reaction between photons and photoresist.....
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Alloy 738 초내열합금 4 mm 두께 각관의 정밀주조 시 수축공 및 수축변위 해석 및 분석
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박명일, 김경민, 이영철, 이정석, 이재현, 유재현, 박상후, 최윤석
Korean J. Met. Mater.
2017;55(2):132-138. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.132
Abstract
Investment casting for the thin (4 mm thick) rectangular tube (40 mm wide, 80 mm high and 200 mm long) was carried out numerically and experimentally for Alloy 738, which is a precipitation-hardened Ni-base superalloy. Two types of rectangular tubes, one with a regular array (10 mm by 10 mm.....
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내진용 고강도 철근의 제조와 기술 개발 동향
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황병철, 심재혁, 이명규, 이준호, 정준호, 김보성, 원성빈
Korean J. Met. Mater.
2016;54(12):862-874. Published online 2016 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.12.862
Abstract
Since reconstruction of old town in Korea requires high-rise and seismic design construction, many attentions have been paid to high strength seismic reinforced steel bar. In the present paper, technical developments and trends are summarized for developing next-generation seismic reinforced steel bar of grade 700 MPa. Steelmaking process requires high.....
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Korean J. Met. Mater.
2016;54(10):732-742. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.732
Abstract
In this work, both experimental and numerical studies were conducted to investigate the densification behavior of stainless steel 316L (STS 316L) powders during hot isostatic pressing (HIP), and to characterize the mechanical properties of HIPed specimens. The HIP experiments were conducted with gas atomized STS 316L powders with spherical particle.....
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