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熱 및 破碎 履歷이 NdFeB 永久磁石의 磁氣的 特性에 미치는 影響
한함윤,김대수 서울産業大學校 1993 논문집 Vol.37 No.1
The micro-structure and magnetic properties of magnetic materials of Nd-Fe-B system has been investigated under the various conditions of heat treatment. It is found that the homogenized ingot exhibit larger grains and equilibrium magnetic phase, higher coercivity compared to the rapidly-quenched one. It also shows the fine micro-structure as well as the soft magnetic phase, which is undesirable to the permanent magnet, such as Fe and NdFe₄B₄, etc. From the series of X-ray diffraction works it is known that the sintered magnet processed from the rapidly-quenched alloy shows the higher degree of crystal orientation toward the c-axis. Sulfur addition on NdFeB alloy has the effect of increasing the residual magnetic flux density due to the enhanced alignment during the process of magnetic-field-pressing.
김대수,한함윤 서울産業大學校 1993 논문집 Vol.37 No.1
The magnetic properties of Fe-based ultra-fine particles(UFP) were investigated varying the parameters such as gas pressure, arc current, and composition of the alloy. The optimum experimental conditions for the best quality UFP were determined to be 150-200 Torr of Ar and the arc currents of 20-30 Amp. The highest coercivety was obtained to be about 920 Oe with the alloy composition of Fe60Co40. From the particle-size measurement from both X-ray diffraction and Transmission Electrn Microscopy it has been seen that Fe-based UFT aggregates consisted of mainly particles with single magnetic domains. And the coercivity in the UFP is thought to be derived from the shape anisotropy like chain-like structure of the UFP aggregate.
304형 스텐레스鋼으로부터 非磁性 스텐레스鋼의 製造에 關한 硏究
김대수,한함윤 서울産業大學校 1993 논문집 Vol.38 No.1
Optimum conditions for the manufacturing of nonmagnetic stainless steel from 304 type stainless scrap and preventing Martensitic transformation during the subsequent cold working process were investigated. The composition of the value of Ni-and Crequivalent be 17.1% and 17.5%, respectively. The amount of δ-ferrite in the specimen of non-magnetic stainless steel thus obtained was measured to be no more than 0.005%, and subsequently, magnetic permeability was determined to be less than 1.003, which is sufficient for the application on the electron-gun material.
방사성동위원소 표지 단일클론항 GGT 항체를 이용한 간 질환에 대한 연구
함수연,최재걸,이민재,정규병,김명곤,류총근 고려대학교 의과대학 1995 고려대 의대 잡지 Vol.32 No.3
This study was designed to investigate whether radioisotope labeled tissue-specific monoclonal anti-γ Glutamyltransferase (GGT) antibodies can be used for the scintigraphic localization of abnormal hepatic tissue of rat. Three monoclonal anti-GGT antibodies (GGT MAb-1, 5, 6) were biochemically purified from the ascites of BALB/c mice which were injected hybridomas secreting monoclonal antibody to a 7.17 mg of immunoglobulin per ml of protein and the mean immunoglobulin amount was 4.98 mg. Then I-131 was incorporated to GGT MAbs by lodogen method with an average labeling efficiency of 77.4% (GGT MAb), and 86.8% (GGT PAb) and in case of Tc-99m by sodium dodesylsulfate, they were 57.7% (GGT MAb), and 77.6% (GGT PAb) respectively. In vitro assay revealed that there was a significant correlation between the result of immunohistochemistry and that of tissue autoradiography according to the type of tissue and monoclonal antibodies in normal heaptic tissue, preneoplastic liver and normal kidney. Modified GGT MAb-1 was specific for the hepatic tissue of preneoplastic liver, GGT MAb-5 for the normal liver, and GGT MAb-6 for the normal kidney. In vivo assay revealed selective localization of radioactivity over tissue specific GGT distributed organs of Wister rat by immunoscintigraphy and tissue γ-counting. In conclusion, radioisotope labeled anti-GGT antibodies might be used for both in vitro and in vivo assays and could be used for the localization of musine hepatic disorders by immunoscintigraphy.
한함윤,류경근,김성태,金大洙 서울産業大學校 1995 논문집 Vol.41 No.1
Differential equations, describing the temperature profile within the toroidal-shaped ferromagnetic material when it was exposed to the external magnetic field which is sinusoidally varying w. r. t. time through the coil surrounding the material, were derived based on the incorporation of Maxwell equations with the equation of heat conduction in solid in cylindrical coordinates. From the numerical calculation of the equations derived the rate of heat generation inside the material and the temperature distribution within the material could be determined. It is found that the temperature profile has a maximum at critical tical frequencies which is dependent on the permeabilities.
Ki-Soo Ham,Sang-Youn Lee 한국유통과학회 2015 KODISA ICBE (International Conference on Business Vol.2015 No.-
The system of division of labor between Korea and China has attained remarkable growth of export to China so far. Since diplomatic relation between South Korea and China in 1992, South Korea has grown up to be third largest trading country with China, and continuous growth of foreign trade with China supported the Korean economy greatly since Financial Crisis in 2008. However, today's Chinese foreign trade environment made change to differ from the past. At economic growth, the Chinese government made change of growth strategy from export orientation to domestic demand to strengthen competitiveness at high level of industrial structure and to let the Chinese enterprises compete with Korean enterprises. In other words, the Chinese market has quite different competition structure. This study investigated the Chinese market based on precedent study on competition structure in the Japanese market (Kwon and Nam, 2013). The study examined changes of foreign trade environment in the Chinese market from point of view of competition structure to empirically investigate Korean enterprises' export strategies. Korean enterprises had strategies of price priority, economy of scale, and product differentiation at changes of competition structure at the Chinese market. The Korean enterprises were found to keep foothold of market entry and to strengthen production ability of special products and to have low profit and insufficient economic outcome, so that they had difficulty at pursuit of profits at the Chinese market.
Lee, Soo-Yoen,Kim, Hyun-Wook,Hwang, Ko-Eun,Song, Dong-Heon,Choi, Min-Sung,Ham, Youn-Kyung,Choi, Yun-Sang,Lee, Ju-Woon,Lee, Si-Kyung,Kim, Cheon-Jei Korean Society for Food Science of Animal Resource 2015 한국축산식품학회지 Vol.35 No.3
This study was conducted to investigate the effects of kimchi powder and onion peel extract on the quality characteristics of emulsion sausage manufactured with irradiated pork. The emulsion sausages were formulated with 2% kimchi powder and/or 0.05% onion peel extract. The changes in pH value of all treatments were similar, depending on storage periods. The addition of kimchi powder increased the redness and yellowness of the emulsion sausage. The addition of onion peel extract decreased the thiobarbituric acid reactive substances value of the emulsion sausages prepared with irradiated pork. The volatile basic nitrogen value of the emulsion sausage prepared with kimchi powder was the highest, whereas that of the emulsion sausage prepared with onion peel extract was the lowest. The treatment without kimchi powder or onion peel extract and the treatments prepared with onion peel extract showed lower microbial populations than the other treatment. Sensory evaluations indicated that a higher acceptability was attained when kimchi powder was added to the emulsion sausages manufactured with irradiated pork. In conclusion, our results suggest that combined use of kimchi powder and onion peel extract could improve quality characteristics and shelf stability of the emulsion sausage formulated with irradiated pork during chilled storage.