산소와 구리의 공정반응에 의한 구리와 알루미나의 직접접합

이임렬,유환성 단국대학교 신소재기술연구소 1991 신소재 Vol.1 No.-

본 연구에서는 구리표면의 구리-산소간의 공정반응에 의하여 형성된 Cu-Cu_2O 공용액상 피막으로 고체 Cu금속과 Al_2O_3세라믹을 압력없이 직접접합시키는 방법을 조사하였으며 접합조건에 따른 접합특성, 파면 및 계면분석을 SEM, EDS, XRD 및 peeling 시험을 통하여 분석하였다. 1.5×10^-1 torr 진공하에서 1015℃의 온도에서 산화시킨 구리시편은 미세한 산화물 Cu_2O가 표면에 잘 형성되었다. 그후 공정온도 1065℃ 이상의 접합온도 1075℃에서 5분간 10^-3 torr의 진공하에서 직접접합시킨 시편은 접합력이 우수한 Cu/Al_2O_3 접합이 되었으며 접합후 구리기니 내에는 Cu2O가 석출된 공융조직을 갖고 있었다. 3분 산화조건에서 충분한 액상이 형성되어 29kg의 최대 접합강도를 보였으며 산회시간이 이보다 짧거나 불충분한 액상의 형성이나 산화물내의 균열 등으로 결합력이 저하하였다. 파단후 Al_2O_3 표면에는 Cu_2O nodule이 존재하였고 Cu족에는 nodule이 빠진홈을 관찰할 수 있었는바 cu2O/Al_2O_3계면 접착력은 Cu.Cu_2O계면보다 강함을 알 수 있었다. 또한 파단면에는 반응 생성물 CuAlO_2가 접합중 형성되었으나 이 반응층 두께는 SEM분해능 이하인 매우 얇은 것으로 생각된다. The direct bonding between Cu and Al_2O_3, utilizing Cu-Cu_2O skin melt formed on Cu surface by eutectic reation of Cu-O, is investigated in this study. The bond strength, fracture surface and interface structure with bonding conditions have been studied using SEM, EDS, XRD and peeling test. A fine Cu_2O is formed on the surface of Cu with oxidation at 1015℃ under 1.5×10^-1torr vacuum. After oxidation, the bonded specimen conducted at 1075℃ in 10^-3torr vacuum for 5minutes, higher temperature than its eutectic temperature of 1065℃, has a good strength having a Cu_2O precipitated structure in Cu matrix upon cooling. It has been found that the maximum bonding force of 29kg is obtatined for 3 minutes of oxidation. However, the adhesion forces are decreased with shorter or longer oxidation than this due to the formation of insufficient liquid skin or crack within oxide. After peeling test, Al_2O_3 surface is covered with Cu_2O nodules which are pulled out of Cu surface indication that Cu_2O/Al_2O_3 adhesion force is stronger than that of Cu/Cu_2O. Moreover a reaction phase of CuAlO_2, thought to be very thin layer below the resolution of SEM, is also formed during the bonding process.

冷間加工의 磨耗에 對한 影響

李任烈 단국대학교 1986 論文集 Vol.20 No.-

The wear experiment was conducted on couples consisting of iron, nickel, Fe-36% Ni and 3% silicon steel pins sliding against a tool steel disc. It has been found that the wear rate in air at room temperature lis independent to me hardness. The experimental observations are well related to the oxidation characteristics. However, the rate of oxidative wear is much higher than that for static oxidation due to the difference in the activation energy for oxidative wear. The lower energy for oxidational wear indicates that the rubbing surfaces are mechanically activated and high diffusivity path for diffusion of matrix elements and oxygen are produced during the sliding motion. The higher wear rate for cold-worked samples than for the annealed ones are associated with the higher oxidation rate for the cold-worked specimen.

역삼투와 투과 증발막 공정의 비교 1: 이론적 해석

Rhim Ji Won,Lee Kew Ho,Bae Seong Youl,Robert Y.M. Huang 한국막학회 1993 멤브레인 Vol.3 No.1

본 논문에서는 역삼투막 공정과 투과 증발막 공정이 Paul과 Ebra-Lima 모델을 사용하여 이론적으로 서로 비교되어졌다. 이 모델로부터 막내에 있는 액의 농도를 역삼투 공정의 경우 압력이 막의 윗쪽에 가하여졌을 때 (반면에 투과 증발 공정의 경우는 가하여진 압력이 무한대일 때) 막 -n-hexane 그리고 rubber 막-benzene 계들에 대하여 계산되어졌다. 또한 polyethylene-n-hexane 그리고 polyethlene-benzene 계들에 대하여 역삼투 및 투과 증발 공정의 투과도가 계산되어졌고 비교되어졌다. 이론적으로는, 투과 증발 공저으이 투과도가 역삼투 공저의 투과도 보다 더 컸음을 알 수 있었다. Reverse osmosis(RO) and pervaporation(PV) membrane processes were compared with each other theoretically by using Paul and Ebra-Lima model. From this model the concentrations of liquid within the membrane when pressure was applied to the upper compartment(for PV case, the applied pressure is infinite) were calculated for rubber membrane-n-hexane and rubber membrane-benzene systems. The permeabilities of RO and PV were also calculated and compared for polyethylene film-n- hexane and polyethylene film- benzene systems Theoretically, the permeabilities of PV membrane were greater than those of RO membrane.

역삼투와 투과 증발막 공정의 비교 2: 실험적 해석

Rhim Ji Won,Bae Seong Youl,Kimura Shoji,Robert Y.M. Huang 한국막학회 1993 멤브레인 Vol.3 No.1

역삼투 및 투과 증발막 분리공정이 nylon 4 blended 막을 사용하여 물-에탄올 계에 대하여 실험적으로 비교되어졌다. 위 두 공저의 이론적 비교를 다루었던 전 논문과 마찬가지로 투과 증발 공정의 분리 효율이 역삼투 공저의 경우 보다 더 좋음을 알 수 있었다. 그러나 투과도 데이타는 막의 결함들로 인하여 엉뚱한 결과를 보였다. Reverse osmosis(RO) and pervaporation(PV) membrane separation proceaes were compared with each other experimentally for the system of water-ethanol mixtures by using nylon 4 blended membranes. The separation effciencies of PV were better than those of RO as expected in previous paper covering the theoretical comparisons of both processes, however tbe permeabilities data showed erraerie results due to the membrane imperfections.

The Role of Research Center for the Development of Urban Underground Space for the Future

Rhim, Hong Chul,Kim, Sang Il 대한건축학회 2012 建築 Vol.56 No.2

Radionuclide-labeled nanostructures for In Vivo imaging of cancer

Rhim Won-Kyu,Kim Minho,HARTMANKEVIN LAURENCE,강건욱,남좌민 나노기술연구협의회 2015 Nano Convergence Vol.2 No.10

Molecular imaging plays an important role in the non-invasive diagnosis and the guiding or monitoring of disease treatment. Different imaging modalities have been developed, and each method possesses unique strengths. While a variety of molecules have been used previously in nuclear imaging, the exceptional properties of nanostructures in recent research enable the deployment of accurate and efficient diagnostic agents using radionuclide-nanostructures. This review focuses on the radionuclide labeling strategies of various nanostructures and their applications for multimodality tumor imaging.

Verilog-A behavioral model for resonance-modulated silicon micro-ring modulator.

Rhim, Jinsoo,Ban, Yoojin,Yu, Byung-Min,Lee, Jeong-Min,Choi, Woo-Young Optical Society of America 2015 Optics express Vol.23 No.7

<P>We present an accurate behavior model for Si micro-ring modulators (MRM) based on Verilog-A, a standard simulation tool for electronic system design. Our model describes the electrical characteristics of the Si MRM using an equivalent circuit and the optical characteristics based on the couple-mode theory. The accuracy of our model is confirmed by comparing simulation results of our behavior model with the measurement results of a fabricated Si MRM. With this behavior model, co-simulation of Si MRM and electronic driving circuits in the standard electronic design environment can be easily performed.</P>

Pinnal dermatitis caused by Arthroderma vanbreuseghemii in a Rex rabbit

Rhim, Haerin,Na, Ki-Jeong,Han, Jae-Ik The Korean Society of Veterinary Service 2017 韓國家畜衛生學會誌 Vol.40 No.1

This report describes a case of pinnal fungal dermatitis caused by Arthroderma vanbreuseghemii in a Rex rabbit diagnosed by clinical signs, macro- and microscopic examination, molecular and phylogenetic analyses. This is the first description of natural A. vanbreuseghemii infection in rabbits in South Korea.

Effect of Clay Type and Concentration on Optical, Tensile and Water Vapor Barrier Properties of Soy Protein Isolate/Clay Nanocomposite Films

Rhim, Jong-Whan Korea Society of Packaging Science and Technology 2009 한국포장학회지 Vol.15 No.3

Soy protein isolate (SPI)-based nanocomposite films with three different types of nanoclays, such as Cloisite $Na^+$, Cloisite 20A, and Cloisite 30B, were prepared using a solution casting method, and their optical, tensile, and water vapor barrier properties were determined to investigate the effect of nano-clay type on film properties. Among the tested nanoclays, Cloisite $Na^+$, a hydrophilic montmorillonite (MMT), exhibited the highest transparency with least opaqueness, the highest tensile strength, and the highest water vapor barrier properties, indicating Cloisite $Na^+$ is the most compatible with SPI polymer matrix to form nanocomposite films. The film properties of SPI/Cloisite $Na^+$ nanocomposite films were strongly dependent on the concentration of the clay. Film properties such as optical, tensile, and water vapor barrier properties improved significantly (p<0.05) as the concentration of clay increased. However, the effectiveness of addition of the clay reduced above a certain level (i.e., 5wt%), indicating that there is an optimum amount of clay addition to exploit the full advantage of nanocmposite films.

CLONING AND ANALYSIS OF HEMOLYTIC GENE FROM BACILLUS THURINGIENSIS SUBSP. MORRISONI PG-14 AND TRANSFORMATION OF CITRUS PLANT

Rhim, Seong-Lyul,Lee, Heung-Guk,Lim, Hak-Tae,Lee, Suk-Koo Plant Molecular Biology & Biotechnology Research C 1993 Plant molecular biology and biotechnology research Vol.1993 No.