• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1282-1284
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• 2003

현재 각 국에서 운영중이거나 개발중인 고속철도차량의 주요 장치의 적용 현황을 정리하고 보다 안정적이고 좋은 승차감을 유지하기 노력과 각각의 장점이 결합되어 진행되는 개발사례에 대하여 알아본다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1283-1284
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• 2011

• Transactions of the Korean Society of Mechanical Engineers B
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• v.26 no.9
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• pp.1284-1291
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• 2002

Combustion instabilities are an important concern associated with lean premixed combustion. Laboratory-scale dump combustor was used to understand the underlying mechanisms causing combustion instabilities. Experiments were conducted at atmospheric pressure and sound level meter was used to track the pressure fluctuations inside the combustor. Instability maps and phase-resolved OH chemiluminescence images were obtained at several conditions to investigate the mechanism of combustion instability and relations between pressure wave and heat release rate. It showed that combustion instability was susceptible to occur at higher value of equivalence ratio (>0.6) as the mean velocity was decreased. Instabilities exhibited a longitudinal mode with a dominant frequency of ∼341.8 Hz, which corresponded to a quarter wave mode of combustor. Heat release and pressure waves were in-phase when instabilities occurred. Rayleigh index distribution gave a hint about the location where the strong coherence of pressure and heat release existed. These results also give an insight to the control scheme of combustion instabilities. Emission test revealed that NOx emissions were affected by not only equivalence ratio but also combustion instability.

• Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
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• 2001.06a
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• pp.1284-1284
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• 2001

The transesterification of molten ethylene/vinylacetate (EVA) copolymers by octanol as a reagent and sodium methoxide as a catalyst in an extruder has been monitored by on-line near infrared (NIR) spectroscopy. A total of 60 NIR spectra were acquired for 37 minutes with the last spectrum recorded 31 minutes after the addition of octanol and catalyst was stopped. The experimental spectra show strong baseline fluctuations which are corrected for by multiplicative scatter correction (MSC). The chemometric methods of orthogonal projection approach (OPA) and multivariate curve resolution (MCR) were used to resolve the spectra and to derive concentration profiles of the species. The detailed analysis reveals the absence of completely pure variables that leads to small errors in the calculation of pure spectra. The initial estimation of a concentration that is necessary as an input parameter for MCR also presents a non-trivial task. We obtained results that were not ideal but applicable for practical concentration control. They enable a fast monitoring of the process in real-time and resolve the spectra of the EVA copolymer and the ethylene/vinyl alcohol (EVAL) copolymer to be very close to the reference spectra. The chemometric methods used and the decomposed spectra are discussed in detail.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.10 s.253
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• pp.1284-1292
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• 2006

Heat treatment is a controlled heating and cooling process to improve the physical and/or mechanical properties of metal products without changing their shapes. Today finite element method is widely used to simulate lots of manufacturing processes including heat treatment and surface hardening processes, which aims to reduce the number of time- and cost-consuming experimental tryouts. In this study we tried, using this method, to simulate the full carburizing process that consists of carburizing, diffusing and quenching, and to predict the distribution of carbon contents, phase fraction and hardness, thermal deformation and other mechanical characteristics as the results. In the finite element analysis deformation, heat transfer, phase transformation and diffusion effects are taken into consideration. The carburizing process of a lock gear, a part of the car seat recliner, that is manufactured by the fine blanking process is adopted as the analysis model. The numerical results are discussed and partly compared with experimental data. And a combination of process parameters that is expected to give the highest surface hardness is proposed on the basis of this discussion.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.21 no.10
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• pp.1284-1293
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• 1997

The electrostatic effect on particle deposition onto a heated, Horizontal free-standing wafer surface was investigated numerically. The deposition mechanisms considered were convection, Brownian and turbulent diffusion, sedimentation, thermophoresis and electrostatic force. The electric charge on particle needed to calculate the electrostatic migration velocity induced by the local electric field was assumed to be the Boltzmann equilibrium charge. The electrostatic forces acted upon the particle included the Coulombic, image, dielectrophoretic and dipole-dipole forces based on the assumption that the particle and wafer surface are conducting. The electric potential distribution needed to calculate the local electric field around the wafer was calculated from the Laplace equation. The averaged and local deposition velocities were obtained for a temperature difference of 0-10 K and an applied voltage of 0-1000 v.The numerical results were then compared with those of the present suggested approximate model and the available experimental data. The comparison showed relatively good agreement between them.

• Journal of Studies in Bibliography
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• no.74
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• pp.261-310
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• 2018

This study attempted to introduce and analyze Baegcheonin-dalanigyeong(百千印陀羅尼經) which were recently confirmed among the golden manuscript in the Koryo Dynasty. The summary is as follows. (1) This is a book written in golden manuscript and it was manufactured by King Chunglyeol & Jegukdaejang-Princess in the 10th year of King Chongryeol's reign (1284). (2) This golden manuscript is written down on the blue paper(紺紙) with gold line border, has a scroll-form with a crystal axis on each end of it, and belongs to the part of the Scripture Tripitaka with the sign of "景". The text were formally written down in 17 letters in a line, however few 16 and 18 letters in one line were discovered. (3) The contents are consisted of following four scriptures in order; Baeg-cheon-in-dalanigyeong(百千印陀羅尼經), Gu-myeon-yeon-agwi-dalani-sinjugyeong (救面然餓鬼陁羅尼神呪經), Bul-seol- gam-lo-dalaniju (佛說甘露陁羅尼呪) 7 line and Jang-eom-wang-dalani-jugyeong (莊嚴王陁羅尼呪經), Hyang-wang-bosal-dalani-jugyeong (香王菩薩陁羅尼呪經). (4) There are unprecedented red signature and a stamp on the reverse side of the front page. The signature belongs to the King Chungryeol and it is the second name of him. The stamp shows 'Wonseongjeon(元成殿)' which is the Princess Jegukdaejang's original temple, and it could be the answer of the controversial debates about the original palace owner. (5) On the cover, there are a figure and floral pattern which seems to be made in the 13th century and the craftsman's name is '鄭(Zheng)[益迂(ig-u)]'. The figure's expression is similar to the other gold and silver manuscript version, but the postures and object hold in a hand are different. (6) Records of publications are similar to the other golden manuscripts, but showed some differences. In addition, the person who wrote this sutra is Choi jeong(崔楨), but the person is not confirmed in the historical data. Yet, it is presumed that he were in lower classes but had outstanding writing skills to be mobilized for the Scripture work. (7) The contents of '景' and four kinds of scriptures (including gamlosudalani(甘露水陁羅尼)) are included in the '景' of the 9th book sinjibjang-gyeong-eum-uisuhamlog (新集藏經音義隨函錄) and Bangsan-seoggyeong(房山石經). It is presumed that the narrative sequence of the scriptures corresponds to the order of The Khitan Tripitaka(契丹藏). In addition, these four types of scriptures are included in the "羔" of joseong-geumjang(趙成金藏), chojo Tripitaka(初雕大藏經), and jaejo Tripitaka(再雕大藏經) but the order of the scripture is recorded in reverse. In addition, this golden manuscript is a valuable data as it holds a lot of differentiator character and various sobriquet of Buddhist literature that can be utilized frequently in researches about Buddhist literature.

• Journal of the Korean Mathematical Society
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• v.38 no.6
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• pp.1275-1284
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• 2001

In this paper, we introduce an iteration generated by countable nonexpansive mappings and prove a weak convergence theorem which is connected with the feasibility problem. This result is used to solve the problem of finding a solution of the countable convex inequality system and the problem of finding a common fixed point for a commuting countable family of nonexpansive mappings.

• Proceedings of the Korean Nuclear Society Conference
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• 2004.10a
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• pp.1283-1284
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• 2004

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1283-1284
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• 2015

본 논문에서는 무전극 플라즈마 광원 장치가 무선기기와의 간섭을 최소화하기 위해 협대역 초고주파 발진을 일으키기 위한 전원 개발을 논의한다.