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[Ni?Fe?/Ag/Ni?Fe?]? 적층막의 자기저항 및 미세구조 분석
李準鎔,金永煥,吳昌烈 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
The microstructure and magnetic properties of Ni??Fe??/Ag multilayer film have been examined to investigate the magneto-resistance characteristics pre/post annealing. The DC & RF magnetron sputter unit has been used to prepare the sample. Annealing of the film has been conducted under the vacuum condition with various temperature. The bridging of Ag has been observed in TEM analysis which shows that Ag atom diffuses through the grain boundary of Ni??Fe??. The maximum saturation magnetization density is obtained at the thickness of 800Å film. The effective permeability is in the range between 1900 and 2800. Magneto-resistance curve of Ni??Fe??/Ag multilayer has maximum value at H=0 which decreases gradually with H.
스퍼터링 조건에 따른 Co 박막의 증착속도 및 미세구조의 변화
백주열,박창만,최영근,이기암,황도근 단국대학교 신소재기술연구소 1992 신소재 Vol.2 No.-
DC 마그네트론 스퍼터링법으로 제조된 코발트 박막에 대해 증착속도 및 미세구조에 미치는 스퍼터링조건의 영향을 조사하였다. 증착속도는 투입전력이 커질수록 증가하였으며, 아르곤 압력이 커질수록 감소하였는데, 이는 투입전력의 증가로 인한 타게트 표면의 이온전류 밀도의 상승과 Ar 압력증가에 따른 비산효과의 증대로 인한 타게트 표면의 이온 전류 밀도의 감소로 고찰되었다. 투입전력이 커질수록 결정립의 크기가 감소하였으며, 투입 전력에 관계없이 특정한 면이 발달하지 않는 비정실 구조를 나타내었다. Ar 압력에 관계없이 비정질 구조를 나타내었다. We have investigated the influence of sputtering condition on deposition rate and microstructure of Co thin film produced by the method of DC Magnetron Sputtering. Deposition rate increased with the input power due to the rise in ionic current density on the surface of target, and decreased with the pressure of Ar gas due to the decrement of ionic current density by the effect of diffusion. Microstructure of the Co thin film became a finer structure with the increase in the input power, and showed amorphous irrespective of the charge of the input power and the pressure of Ar gas.
릿벨트법에 의한 La_1+xSr_2-xMn₂O_7상의 구조 정밀화
서상일,최창규,송민석,이재열 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2
The RP phases, La1+XSr2-XMn2O7-δ, were synthesized with La2O3, SrCO3 and MnO2 by solid state reaction at 1450℃. Stable single phases were crystallized in the range of x=0.2 ∼ x=0.5. In this paper, the structures of the La1+XSr2-XMn2O7 were refined with the X-ray powder diffraction data using the Rietveld method. This structure belongs to the space group of I4/mmm and the structure is built up from the intergrowth of one rock salt type layer with a double perovskite layer. As x increases, the Mn-O bond distance along c-axis grows longer than the bond of in ab plane due to increased Jahn-Teller distortion, which is arised from the increased concentration of Mn3+ ions.
Strategic issues for Korean distribution companies' penetration of the Chinese market
Chang-Yeoul Choi,Joo-Young Lee 인하대학교 정석물류통상연구원 2009 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.7 No.2
Since the declaration of reform and market opening from China in 1990, China has drawn much attention from the world thanks to its rapid economic growth and its emergence as the world"s major consumer market and the center of the global economy. Moreover, it established the new trade order, making East Asia the center of the new trade trend as it becomes a manufactural and sales stronghold of multinational companies. The Chinese distribution market is expected to show a high growth rate by 2010 and it draws attention as a new business sector which can bring huge profits. However, advancement of the Chinese distribution industry now faces systemic problems and research on such problems is insufficient. Therefore, in this study we will conduct SWOT analysis based on previous studies on the Chinese distribution industry and use it as a ground to propose strategic solutions for development.
Self-heating of Magnetite Nanoparticles for a Potential Hyperthermia Application
Chang-Yeoul Kim,Lixing Xu,Eun-Hee Lee 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.2
A comparative study of heat generation in superparamagnetic magnetite nanoparticles in aqueousand hexane solutions in the presence of external magnetic field is presented. The field strengthdependence of the specific absorption rate (SAR) complies with the power law of second order. The concave-convex change of SAR-H curves substantially illustrates the importance of particledispersion in the fluid.
한국산 맵시벌과의 분류학적 연구 10. : 뭉툭맵시벌족(뭉툭맵시벌아과) The Tribe Tryphonini(Tryphoninae)
이종욱,김창환,차진열 고려대학교 한국곤충연구소 1988 昆蟲硏究誌 Vol.14 No.1
한국산 뭉툭맵시벌족을 재고찰한 결과 4종의 기존종 (Monoblastus clauseni, M. erythrurus, Tryphon nagahamensis (=T. satoi, syn. n. by Kasparyan), T. brevipetiolaris)의 한국 미기록종인 Cosmoconus elongator, Polyblastus wahlbergi, T. obtusator, T. kazachstanicus, T. kinzi, T. punctatus 등 6종이 추가되어 한국산 뭉툭맵시벌족에는 총 10종이 보고된다. In the present work, seven species were recognized. Two additonal genera and six species were newly recorded form Korea. A key to the Korean genera, subgenera and species of Tryphonini was also given. The list of Korean species of tribe Tryphonini is as follows: Cosmoconus elongator (Fabricius) Monoblastus erythrurus( Townes, Momoi et Townes) Monoblastus clauseni (Uchida) Polyblastus (Polyblastus) wahlbergi Holmgren Tryphon (Stenocortaphon) nagahamensis Uchida Tryphon (Stenocrotaphon) hazachstanicus Kasparyan Tryphon (Stenocrotaphon) obtusator (Thungerg) Tryphon (symboethus) hinzi (heinrich) Tryphon (symboethus) punctatus Kasparyan Tryphon (symboethus) brevipetiolaris Uchida