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신용진,양경승,김영섭,박영식,김태훈 한국레이저가공학회 2002 학술발표대회 Vol.2002 No.1
레이저 마킹시 홈의 형성은 레이저 빔 조사 후 10ns 이내에 형성될 것으로 예상되어지며 레이저 조사가 끝나면 반전 현상이 일어날 것으로 예상되어진다. 또한 시간 분해 반사도는 정지해 있는 시료나 움직이는 시료에서 비슷할 것으로 예상되어진다. 레어지에 의해 시료에 발생되어지는 온도는 마킹을 형성시키는 출력의 문턱값이 존재하고 시간에 독집적으로 일정한 두께를 남기며 마킹되는 현상으로 설명되어 질 것이다. 이러한 온도의 계산으로 열 및 화학적 작용에 관한 마킹 메카니즘의 해석이 가능해질 것이다.
김남규,임재근,이용찬,신용진 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
In this thesis, we fabricate a zero-magnetostrictive amorphous ribbon, measure the Barkhausen effect and ten investigate possibility to be used as a sensor material. ?? is used as composition of specimen alloy. We first melt the specimen in high frequency induction furnace and then rapidly quench it by using single roll technique. As the result, we obtain a ribbon where thickness=10.4㎛ , width=10.4㎜ and length=5㎝. In order to improve magnetic characteristics of the specimen, we annealing it in the magnetic field. As the result of the measurement of the magnetic characteristics, we find that the fabricated ribbon has large Barkhausen jump even in weak magnetic field below 0.5Oe. Consequently, it is proved through this study that zero-magnetostrictive amorphous ribbon can be used as an excellent magnetic sensor material.
정왕일,이용찬,정승우,신용진 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
In this study, we deal with the effect on magnetic properties when Nd is added to Sr·ferrite bonded magnet. First, we choose ??, which is nonstoichiomatric composition, as specimen ferrite. Then, we add 5wt% polyvinyl alcohol and calcinate at 1225℃ under N₂ environment for carbon coating on chemical compound specimen. After that we obtain 1.2㎛ single domain powder through grinding process for 18 hours. The 90wt% Sr ferrite powder is well mixed with silane coupling and calcium stearate of 1wt%. Then, it is kneaded by using polyamide12 as a binder and is pelleted. After adding Nd-Fe-B powder to the pelleted specimen, we injection-mould it under magnetic field by using anisotropic mould. Especially, when we add 13wt% Nd-Fe-B powder to the polyamide12, we obtain excellent magnetic propertiecs which are ??, Br=3.16KG and ??.
衝擊波動 重疊原理에 의한 耐衝擊性 3重壁構造 Polymer
申容珍,崔勝平,梁京承,白昌鉉 朝鮮大學校 自然科學硏究所 1995 自然科學硏究 Vol.18 No.1
In thermoplasticity polymer, mean molecular weight and molecular weight distribution are the important factors which effect the physical property. If impact strength(I.S-) is high, tensile strength(T.S.) and flating weight(F.W-) are low. Because of the reciprocal relation I.S. and T.S. there set a limit to satisfy I.S. and T.S. in single matter at the same time. Applying the superposition principle to the polymer, extemal impact wave pulse on the 3-1ayered stmcture may be changed to the transmitted wave and reflected wave, and then separated waves lose the mechanical energy to the S-layered structure which contains different molecular weight. There is the dispersion and attenuation of the impact energy, hence at the low temperature impact strength and tensile strength synchronously are high.