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Han, Jung-Hoon,Oh, Juhyun,Yoon, Sangmoon,Kim, Yanghoo,Han, Heung Nam,Kim, Miyoung Korean Society of Microscopy 2016 Applied microscopy Vol.46 No.4
Twinning-induced plasticity (TWIP) steels with the austenite structure containing high manganese exhibit both good strength and excellent formability. Such properties originate from crystallographic slip and mechanical twins produced when the austenite structure is under mechanical stress. There are 12 twin systems, referred to as twin variants, when slip is induced. These twin systems include twin planes and twin directions and play an important role in determining strength and ductility of the material by strongly influencing texture formation of the austenite structure. In the present study, twins produced in a high-Mn TWIP steel as a result of uniaxial tension were observed using a transmission electron microscope; a comparative analysis was performed through interaction energy calculations. Electron diffraction was used to determine the twin system with respect to the uniaxial tension direction in each grain. Both the Schmid factors and interacting energies required for the generation of twins were calculated and subsequently compared with experimental results. This approach demonstrated the possibility of predicting the deformation behavior of the material.
한경숙(Kyungsook Han),조주현(Juhyun Cho),한선영(Sun Young Han),전길남(Kilnam Chon) 한국정보과학회 1985 정보과학회논문지 Vol.12 No.2
최근에 object지향 언어와 구조에 대한 관심이 크게 증가하였으며, 이러한 경향은 smalltalk-80 시스템에서 비롯되었다고 할 수 있다. KAIST Smalltalk은 UNIX하에서 C Language로 Smalltalk-80 시스템을 구현한 것이다. 이는 다른 Smalltalk implementation에 비해, host processor와 bitmap display에서 높은 호환성을 제공한다는 특징을 갖고 있다. 본 논문에서는 KAIST Smalltalk을 포함한 현 Smalltalk시스템들을 논의하고, 분산 object지향 구조에 적합한 새로운 모델을 제시하였다. In recent years, there has been great increase of interest in object oriented languages and architectures. Much of the interest is attributed to the Smalltalk-80 system. KAIST Smalltalk is an implementation of the Smalltalk-80 system in C language under UNIX. This differs from the standard Smalltalk-80 implementations by giving high portability in both a host processor and a bitmap display. This thesis discusses current Smalltalk systems including KAIST Smalltalk and proposes a new object model suitable to a distributed object oriented architecture.
Juhyun Yoo,Sangmoo Han,Youngkwang Nam,정시영 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
In absorption chillers using LiBr aqueous solution, corrosion problems of carbon steel heat exchangers become more serious as the temperature of the generator increases. To reduce the corrosion problems, various surface treatment methods are applied such as a shotpeening. In this study, corrosion characteristics were investigated for untreated and shotpeened surfaces. Pyrex tube samples containing the specimens and LiBr aqueous solution with Li 2 MoO 4 were made and put into a high temperature oven at 200 ℃. After 2000 hours, the surface and cross section of carbon steel specimens were observed using field emission scanning electron microscope (FE-SEM) and energy dispersive spectroscopy (EDS). It was found that the passive films have the characteristic of a double layer consisting of a thick MoO 2layer and thin Fe 3 O 4 layer. Thicker passive films were observed on the shot-peened surface than the untreated one. As a result of corrosion depth measurement, the shot-peened specimens showed a slightly smaller uniform corrosion depth, however, they showed a much smaller pitting corrosion depth than the untreated ones. It is supposed that the shot-peened surface is more effective in preventing the pitting corrosion than uniform corrosion. The results of this study are expected to be applied effectively to the absorption chillers using LiBr aqueous solution to estimate and reduce the corrosion.
Biochemical Responses of Soybean (Glycine max L. Merr.) to Proton Beam Irradiation
( Juhyun Im ),( Jonghan Ko ),( Han-yong Kim ),( Bo-keun Ha ) 한국육종학회 2017 Plant Breeding and Biotechnology Vol.5 No.2
The present study evaluated the biochemical effects of proton beam irradiation in soybean. Seeds of two Korean elite cultivars (Kwangan and Pungsannamul) were irradiated by a 57-MeV proton beam in the range of 50-400 Gy. We measured the contents of malondialdehyde (MDA), antioxidant enzymes, and chlorophyll. MDA contents in proton beam-irradiated plants were higher than those in control plants. The activity of antioxidant enzymes differed between the two cultivars. In Kwangan, ascorbate peroxidase (APX) activity increased by 29% relative to the control at 55 Gy and decreased by 58% at 308 Gy. Superoxide dismutase (SOD) and peroxidase (POD) activities decreased by 47 and 25% relative to the control at 55 Gy and recovered to 87 and 56% of that at 55 Gy with 172 Gy and 117 Gy, respectively. In Pungsannamul, APX and SOD decreased by 32 and 35% relative to the control at 62 Gy, with the highest value observed at 243 Gy. In terms of the chlorophyll content, the two varieties responded similarly to proton beam irradiation, whereas in Kwangan, no significant reduction was observed above 100 Gy when compared with the control. Proton beam irradiation affected chlorophyll b more than chlorophyll a. These results show that the activity of antioxidant enzymes decreased in response to irradiation with approximately 50 Gy proton beams, then increased gradually with increasing doses, followed by a moderate decrease at higher doses. According to correlation with MDA contents and antioxidant enzyme activities, defense system of Pungsannamul was less activated by proton-beam irradiation than that of Kwangan.
추진기관 시스템 시험설비 개발을 위한 해외사례 분석 및 적용방안
박주현(Juhyun Park),박순상(Soonsang Park),한영민(Yeoungmin Han),김지훈(Jihoon Kim) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
로켓 추진기관 시스템의 성능을 입증하기 위한 시험설비는 로켓시스템의 개발을 위한 필수 인프라이다. PSTC는 발사체의 각 단별 추진기관 시스템의 수류시험 및 연소시험을 수행하고, 발사 프로세스에 대한 지상검증을 수행한다. PSTC 개발을 위해 국내외 기술을 조사하여, 관련분야의 사례를 적극 활용한다. 추진기관 시험설비는 유공압 시설 및 제어계측, Test Stand, 화염유도로 등을 구성한다. The test facility for confirming performance of a propulsion system is essential infra-structure to develop launch vehicle system. Using the PSTC, cold flow and combustion tests are performed to the propulsion system of individual stage in launcher. Moreover the ground test for the total launching process is conducted. In order to construct the PSTC, we not only have surveyed technology of internal and external countries, but also actively use the case in terms of the system. The test facility consists of feeding system, test stand, control and measurement, and flame deflector.
LiBr 수용액 내 탄소강의 부식에 표면처리가 미치는 영향
유주현(Juhyun Yoo),한상무(Sangmoo Han),남영광(Youngkwang Nam),정시영(Siyoung Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In absorption machines, various surface treatment methods such as shot-peening are applied to reduce the corrosion of carbon steel heat exchangers. Although a shot-peening process was proven to be beneficial in the fatigue corrosion, but its effect on pitting corrosion has been rarely investigated. Therefore, the present study aims to figure out the effects of the surface treatment in local corrosion resistance including pitting corrosion under operating conditions of triple effect absorption chiller. In this study, the mass loss by the corrosion was measured using the gravimetric method. Also, the maximum corrosion depth and the corrosion shape were analyzed using the contact profiler and the field emission scanning electron microscope(FE-SEM). The results show that the shot-peening treatment is effective in the suppression of both general corrosion and local corrosion. The results of this study are expected to be applied effectively to predict and reduce the corrosion in absorption chillers using LiBr aqueous solution.