http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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 Changhee ) 국어교육학회 2020 國語敎育學硏究 Vol.55 No.5
This study reviewed 41 domestic studies using a systematic literature analysis method to investigate the kind of research conducted in relation to digital reading in the research field of Korean language education. First, overall trends such as publication year, school level, and research method were examined. Studies on digital reading began in 2004 in the field of Korean language education, and a total of forty-one studies were selected. Among the 41studies, eleven studies (27%) were conducted on digital reading at the secondary school level. In addition, based on Coiro’s (2020) heuristics on digital reading, this study examines, how Korean digital reading studies were conducted in terms of text, readers, activities, and contexts. Regarding text, most (78%) focused on reading Internet text in an open Internet environment. Regarding readers, eight studies (44%) related to readers’ cognitive capabilities , followed by studies related to reading dispositions (39%). Regarding activity, with 7 items, online inquiry to solve problems ranked the highest. In case of context, most studies on digital reading in Korean language education are on reading on Internet web pages using computers. Based on this systematic literature review, this study proposes the following two discussions.
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.
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.
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.