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Correlation Between Constituent Phase and Weld Metal Properties in Ni-Reduced Duplex Stainless Steel
Youngchai Lee,Jae Hee Lee,Joonoh Moon,Tae‑Ho Lee,Changhee Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
The intrinsic properties of austenite and ferrite on the mechanical properties and corrosion resistance of the duplex stainlesssteel weld metals was studied by substituting Ni with Mn, N, and Mn + N. The properties of the weldments fabricated throughgas tungsten arc welding (GTAW) were evaluated using tensile test, Vickers hardness, and potentiodynamic polarizationtests. The mechanical properties and corrosion resistance of the constituent phases were measured using nanoindentationand electron probe microanalysis, respectively. The austenite and ferrite phase fractions of the weld metal were maintainedat approximately 50:50, and no harmful phases degraded the properties. Excessive Mn decreased the corrosion resistance; alarge difference in corrosion resistance between austenite and ferrite also decreased the overall corrosion resistance. In thefiller metal in which Ni was replaced with only Mn or N, the austenite became harder than ferrite, as a result cracks initiatedinside the austenite. The tensile test showed that austenite, which became a relatively hard phase compared to ferrite accordingto the chemical composition, increased the yield strength and decreased the elongation of the weld metal.
Lee, Ji Hyun,Jung, Aeran,Park, Han Na,Lee, Changhee,Mandava, Suresh,Lim, Sung-jun,Lim, Byoung-bok,Park, Sung-Kwan,Lee, Jongkook,Kang, Hoil Elsevier 2018 Forensic Science International Vol.291 No.-
<P><B>Abstract</B></P> <P>Illicit psychoactive substances have threatened public health worldwide. An active metabolite of ADB-CHMINACA and MDMB-CHMINACA was identified for the first time in a powder-type product found in an airmail package. The structure of compound 1 was elucidated by a combination of gas chromatography-mass spectrometry (GC–MS), liquid chromatography-high resolution mass spectrometry (LC-HRMS), infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy. Compound 1 was proven to be an analogue of MDMB-CHMINACA, an indazole-based synthetic cannabinoid. The methyl ester group in MDMB-CHMINACA was replaced with a carboxylic acid group in compound 1. Compound 1 was determined as 2-[1-(cyclohexylmethyl)-1<I>H</I>-indazole-3-carboxamido]-3,3-dimethylbutanoic acid and named as DMBA-CHMINACA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new indazole-3-carboxamide class synthetic cannabinoid was identified. </LI> <LI> Compound 1 was named as DMBA-CHMINACA according to the EMCDDA guideline. </LI> <LI> DMBA-CHMINACA is a hydrolysed form of MDMB-CHMINACA. </LI> <LI> DMBA-CHMINACA is a potential CB1 and CB2 agonist. </LI> <LI> DMBA-CHMINACA can work as a synthetic precursor of several synthetic cannabinoids. </LI> </UL> </P>
Lee, Youngho,Moon, Ohak,Lee, Honam,Lee, Bonggeun,Kang, Bongsoon,Hong, Changhee 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1
In this paper, we propose an algorithm, an optimized architecture, and an implementation for an improved performance of image downscaler. The proposed downscaler uses two-dimensional digital filters for horizontal and vertical scalings, respectively. It also improves scaling precisions and decreases the loss of data, compared with the 1/32 scaler. In order to achieve the optimization, the digital filters are implemented by the multiplexer-adder type scheme. The scaler is designed by using the Verilog-HDL. It is synthesized into gates by using the SAMSUNG 0.35um STD90 TLM.
이현용,강재훈,이승우,박창희 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
General process for waste vinyl pretreatment system is consisted of separating, crushing, washing, drying and recovering impurities. This paper is about a study of development on crusher system for waste vinyl pretreatment system. This system consists of three crusher : 1) Hydraulic cutter to cut in 1m size, 2) 1st crusher to cut in 20~30cm size, 3) 2nd crusher to cut in 3~8cm size.
High Performance Image Downscaler using Two-Dimensional Phase-Correction Digital Filters
Lee, Youngho,Kang, Bongsoon,Hong, Changhee 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
본 논문에서는 이차원 위상-교정 디지털필터를 이용한 고화질 디지털 영상축소기에 관한 알고리듬과 하드웨어 구조를 제안한다. 제안된 축소기는 수직방향으로 1/32 line과 수평방향으로 1/64 pixel의 정밀도를 가진 비선형 위상 필터를 사용하여 고화질의 축소 화상을 제공한다. 최적화된 하드웨어 구조를 달성하기 위하여, 디지털필터는 shifter와 adder를 이용하며 구성한다. 마지막으로 시뮬레이션을 통해서 기존의 1/32 scaler[1]</참고문헌참조>의 결과와 비교하여 제안된 방법의 우수성을 보인다.
Changhee Han,Sungyoon Song,Yeuntae Yoo,Jaehyeong Lee,Gilsoo Jang,Minhan Yoon 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the future, Distribution network will face many challenges due to increased acceptance of renewable resources such as photovoltaic (PV) and wind power. Typical problems that arise from increased penetration of renewable resources include overvoltage issues, load imbalances on each feeder, and fluctuations in power output. In this paper, we consider installing Soft-Open Points (SOPs) to solve these problems. SOP is a power electronic device installed at the normally-open point (NOP) of the distribution network. Typically, SOPs are comprised of voltage source converters (VSCs), which can control the power flow between the feeders. In this paper, we discuss the method of calculating the optimal operating point of a SOP using the Particle-Swarm Optimization (PSO) algorithm using the characteristics of the SOP that can independently control the active and reactive power flows. The IEEE-33 bus test system was modified to verify the proposed method and the objective function for the bus voltage deviation and the index for the total line losses can be minimized simultaneously by using the PSO algorithm to optimize the multiple objective function Algorithm.
( Changhee Kim ),( Sanghoon Lee ),( Soowook Kim ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Purpose: This study is to analyze the efficiency in the operation of the franchises in the coffee industry in Korea, which shows the rapid growth recently and thus find out what the consumers think is important in the selection of coffee franchise and what factors meet their demands. Methodology/Approach: For the analysis, the input factors and output factors are obtained through the prior studies and electronic disclosure system of Financial Supervisory Service of Korea and the operational efficiency in the coffee franchises is analyzed for selection of benchmarking. In addition, the questionnaire is distributed to Korean consumers to find out how to enhance the efficiency. Then, the answers from questionnaires are analyzed using IPA (Importance Performance Analysis) and AHP (Analytic Hierarchy Process). Findings: In this study, the relative operational efficiency of each coffee franchiser would be obtained. In addition, the IPA matrix would be obtained from the consumers to find out the factors such as Quadrant A (Concentrate here), Quadrant B (Keep up the good work), Quadrant C (Low priority), and Quadrant D (possible Overkill). Research Limitation/implication: In this study, as Korean market is larger than any other place in Asia, the study was conducted targeting the Korean market. Accordingly, the findings in this study may not represent the trend in other nations. So, in the following studies, the analysis of the coffee franchises in other countries would be required. Originality/Value of paper: The per capita coffee consumption in Korea is five times as much as that in all of other Asian countries. As there is so much consumption of coffee in Korea, the large coffee franchisers such as Starbucks, Coffee Bean and CafeBene are increasing their number of stores in Korea, thus making Korea as the battle field for large coffee franchisers. So, as the study tries to find out the operational efficiency of coffee franchisers and the standard of selection of coffee franchiser by the Korean consumers through the analysis of importance and satisfaction, the findings would have a lot of implications for the efficient operation of coffee franchisers.
Changhee Shin,Namgue Lee,Hyeongsu Choi,Hyunwoo Park,Chanwon Jung,Seokhwi Song,Hyunwoo Yuk,Youngjoon Kim,Jong-Woo Kim,Keunsik Kim,Youngtae Choi,Hyungtak Seo,Hyeongtag Jeon 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
VO2 is an attractive candidate as a transition metal oxide switching material as a selection device for reduction of sneak-path current. We demonstrate deposition of nanoscale VO2 thin films via thermal atomic layer deposition (ALD) with H2O reactant. Using this method, we demonstrate VO2 thin films with high-quality characteristics, including crystallinity, reproducibility using X-ray diffraction, and X-ray photoelectron spectroscopy measurement. We also present a method that can increase uniformity and thin film quality by splitting the pulse cycle into two using scanning electron microscope measurement. We demonstrate an ON / OFF ratio of about 40, which is caused by metal insulator transition (MIT) of VO2 thin film. ALDdeposited VO2 films with high film uniformity can be applied to next-generation nonvolatile memory devices with high density due to their metal-insulator transition characteristic with high current density, fast switching speed, and high ON / OFF ratio.