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No‑hoon Kim,Woong Gil,Heui‑dae Lim,Chang‑hyeon Choi,Hae‑woo Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
This study investigates the effect of the Mo content on the mechanical and corrosion properties of hyper duplex stainless-steelwelds that are subjected to flux cored arc welding (FCAW). Conventional hyper duplex stainless steel has limited productivityowing to the welding position and welding equipment of gas tungsten arc welding (GTAW) and submerged arc welding(SAW). As such, the purpose of this study is to develop a weld material for FCAW, which is not subject to the limitations ofGTAW and SAW, as well as to improve productivity and quality. FCAW was performed under the same conditions, exceptfor the Mo content, which were varied to 3, 4.5, and 6 wt%. Tensile and impact tests were carried out to investigate thevariation of the mechanical properties according to the Mo content. As the Mo content increased, the elongation decreasedand the strength increased. It was confirmed that the δ-ferrite phase increased and the γ-austenite phase decreased as theMo content increased. Secondary phase such as σ phase, χ phase were mainly distributed in ferrite grains or austenite–ferritegrain boundaries using EBSD. It was also increased as the Mo content increased. To evaluate the corrosion resistance,Potentiodynamic Polarization Tests and DL-EPR tests were conducted. As a result, all of specimens showed similar corrosionresistance.
박노국,유성구,서길수,이태진 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
The sulfidation reaction of calcium carbonate to remove H2S were investigated. Expecially, the effect of polymorphs of calcium carbonate and reaction temperature on the sulfur capture were determined. It was found that calcination reaction of calcium carbonate were influenced by polymorphs of calcium carbonate. The calcination temperatures of aragonite were lower than those of other calcium carbonates. For the sulfidation of calcite with H2S, the effect of reaction temperature on the sulfur capture were not found. But in caes of vaterite and aragonite, the reaction temperature were found to have a significant effect on the sulfidation reaction. From in these results, optimum temperatures of sulfidation reaction using vaterite and aragonite were determined at 800∼850℃ and 750℃, respectively.
송민정,기노갑,장길수,김선우 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10
A sound classification system for floor impact sound insulation performance is needed to secure comfortable acoustical quality in apartment houses To achieve this goal, psycho-acoustic experiments were earned out with the sound sources of standard light and heavy impact source in a laboratory As a result of this study, followings are suggested 49dB for light impact sound source and 46dB for heavy impact sound source are recommended minimum level for inhabitants And level differences between classes are 5dB But the situation of sound insulation performance against floor impact sounds can't meet this recommended level Due to these kinds of matters, foreign countries set the minimum class 58dB for light impact source(Europe) and 55dB for heavy impact source(japan) So, the sound insulation classification system in which its minimum class are 58dB(light), 55dB(heavy) and its interval is 5dB is suggested And arithmetic mean value of testing frequencies shows a good relation coefficient between subjective response and rating value both in light and heavy impact sound source
명노길(No-Gil Myoung),이상염(Sang-Yeum Lee),김영현(Youn-hyun Kim),최효열(Hyo-yul choi) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
단방향 전력망에 정보통신 기술을 접목하여 전력공급자와 소비자가 양방향 실시간 정보를 교환함으로써 에너지 효율을 최적화하는 스마트 그리드의 핵심 역할을 수행하는 원격검침 시스템에 대한 연구개발 및 사업화가 전 세계 전력사별로 활발해 진행 중에 있다. 한전도 지난 수년간의 연구개발 및 시범사업을 통하여 가공구간에 국한하여 금년도 50만호를 시작으로 대규모 사업화를 준비 중에 있다. 본 논문은 지중구간 사업화 걸림돌로 인식되어 왔던 장거리 지중고압구간 에서 PLC(Powerline Communication) 전송거리 향상 방법과 저가의 중성선용비접촉 커플러 사용을 통한 지중구간 사업화 방안을 제시하고자 한다.
지능형 원격검침시스템을 이용한 전력손실 감시방법에 대한 연구
명노길(No-Gil Myoung) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.8
Major utilities have been focusing on R&D and nationwide business of AMI system which plays a vital role in SmartGrid whose concept is to maximize energy efficiency and optimize electric power facility management with exchanging real time information between utilities and consumers based on ICT technologies in power grid. In this paper, we suggest a power loss monitoring method using KEPCOs AMI system which is operating in fields and with the acquisition of AMI data and analyses verify the validation of a power loss monitoring method.
Park, No-Won,Lee, Won-Yong,Yoon, Yo-Seop,Kim, Gil-Sung,Yoon, Young-Gui,Lee, Sang-Kwon American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.41
<P>Recently, low-dimensional superlattice films have attracted significant attention because of their low dimensionality and anisotropic thermoelectric (TE) properties such as the Seebeck coefficient, electrical conductivity, and thermal conductivity. For these superlattice structures, both electrons and phonons show highly anisotropic behavior and exhibit much stronger interface scattering in the out-of-plane direction of the films compared to the in-plane direction. However, no detailed information is available in the literature for the out-of-plane TE properties of the superlattice-based films. In this report, we present the out-of-plane Seebeck coefficient, thermal conductivity, and electrical properties of p-type Bi<SUB>2</SUB>Te<SUB>3</SUB>/Bi<SUB>0.5</SUB>Sb<SUB>1.5</SUB>Te<SUB>3</SUB> (bismuth telluride/bismuth antimony telluride, BT/BST) superlattice films in the temperature range of 77-500 K. Because of the synergistic combination of the energy filtering effect and low interfacial resistance of the superlattice structure, an impressively high <I>ZT</I> of 1.44 was achieved at 400 K for the 200 nm-thick p-type BT/BST superlattice film, corresponding to a 43% <I>ZT</I> enhancement compared to the pristine p-BST films with the same thickness.</P> [FIG OMISSION]</BR>