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ISEFT 마이크로센서용 샘플챔버 설계 및 4채널 전해질 분석기의 구현
배상곤,이호신,원철호,채승표,김창수,조병욱,손병기,김명남,조진호 ( Sang Kon Bae,Ho Shin Lee,Chul Ho Won,Seung Pyo Chae,Chang Soo Kim,Byung Wook Cho,Byung Ki Sohn,Myoung Nam Kim,Jin Ho Cho ) 한국센서학회 1997 센서학회지 Vol.6 No.4
In this paper, a sample chamber which provide easy replacement of ISFET sensor and consume only small sample volume for electrolyte analysis is designed and a 4-channel electrolyte analyzer employing 2-point calibration method is implemented. In addition, we proposed sample loading detection circuit for minimizing sample and calibration solutions and implemented it. Developed electrolyte analyzer consists of control system part and flow system part. For the effective control of the developed hardware, system software is developed as three individual routines ; measuring routine, calibration routine and washing routine.
김기배,김도향,이호인 ( Ki Bae Kim,Do Hyang Kim,Ho In Lee ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.2
N/A The wetting behaviour of SiC /Al-Li composite interface has been investigated by using an infiltration method. The critical pressure for melt infiltration into SiC particulate preform has been determined by measuring the melt infiltration distance changes with the variation of applied pressure. The threshold pressure of pure Al, Al-0.2wt%Li, Al-0.5wt%Li for melt infiltration are 3.94, 3.93> 3.75㎏/㎠ respectively, which implies a slight improvement in wettability of SiC /Al composite by addition of Li. The threshold pressure for melt infiltration also changes with the variation of other parameters such SiC particulate size, SiC particulate fraction and melt temperature.
스퀴즈캐스팅용 Salt Core 의 제조 및 용탕침투성에 관한 연구
김기배,노상우,이호인,남태운 ( Ki Bae Kim,Sang Woo Noh,Ho In Lee,Tae Woon Nam ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4
N/A Developing a salt core for squeeze casting process, two different salt cores(pure salt core and mixed salt core) were fabricated and investigated. Pure salt core was composed of 100% NaCl and mixed salt core was made by mixtures of NaCl with MgO(1%), Na₂B₄O_7(2%), and talc(1%) as a binder or a strengthening agent. Salt cores were compacted to various theoretical density, heat treated, and then squeeze-cast with molten Al alloy(AC8A). The compression strength of salt cores were measured and the squeeze-cast products were examined for shape retention, infiltration of molten metal into the cores, and microstructures. The shape of salt core compacted at above 75% of the theoretical density was maintained stably. The higher theoretical density of salt cores gave higher compression strength, and the compression strength of mixed salt core was higher than that of pure salt core. Namely at 90% theoretical density, the compression strength of mixed salt core was 6.3㎏/㎟, compared to 4.6㎏/㎟` for pure salt core. At a squeeze casting pressure of 1000㎏/㎠, molten Al alloy was infiltrated into pure salt core of under 85% of the theoretical density. At squeeze casting pressure of 1000㎏/㎠, only mixed salt core above 90% of the theoretical density were valid, but the shape of the core was altered in the case of pure salt core at 90% of theoretical density. A key factor for developing a salt core for squeeze casting process was estimated as the ultimate compressive strength of salt core.
김기배,김경민,이재철,이호인,윤의박,조남돈 ( Ki Bae Kim,Kyoung Min Kim,Jae Chul Lee,Ho In Lee,Eui Pak Yoon,Nam Don Cho ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A The effect of forced convection on the solute redistribution of the Al ingot is studied in an effort to fabricate high purity aluminum using a fractional solidification processing. Experimental setup is built in order for the Al melt to be solidified from the surface of the graphite cooling tube, which is rotated at a constant revolution rate to generate the forced convection environmental ahead of the solidification front. Based on the experimental results, Fe and Si concentrations, added as impurities within the Al ingot, decrease as the distance measured from the graphite tube and growth rate decreases and as revolution speed increases. In the case of Al melt with high initial solute concentration, spiral columnar grains tend to form along a direction of revolution. In the case of Al melt with low solute concentrations, however, grains tend to grow with planar geometry. In the fractional solidification process, the solute concentration within the solid phase tends to decrease at the early stage of solidification, reaches minimum concentration, and then increases gradually as solidification proceeds. The solute redistribution obtained based on the BPS model incorporated with the tangential flow component as well as the axial flow component within the melt, agree well with the measurements under sufficiently high revolution speed and low solidification rate.
예방접종피해 국가보상제도 개선을 위한 비교법적 연구 - 미국, 독일, 일본의 예방접종피해 국가보상제도를 중심으로 -
박소미 ( So Mi Park ),김기연 ( Gi Yon Kim ),변무웅 ( Mu Ung Byun ),이호용 ( Ho Yong Lee ),김춘배 ( Chun Bae Kim ),고은영 ( Un Yeong Go ),김기경 ( Ki Kyong Kim ) 한국의료법학회 2009 한국의료법학회지 Vol.17 No.1
This study was designed to recommend national policy related to the national vaccine injury compensation programs to Korean government based on the comparative analysis of foreign countries (U.S.A, Germany and Japan) management, cases, law system, operation & compensation system. Data collection related to the national vaccine injury compensation by four countries' article, text, web, regulations and consultation from experts. The reforms of national vaccine injury compensation programs were recommended based on the analysis of three countries' system. The items of each area are as follows: adverse events for reporting and compensation need to be unified restrictions on access for compensation need to be removed; standards for recognition of claims need to revise; multi-parties' participation on collection of found for compensation; compensation coverages need to be extended to cover real expenses. In conclusion, the results of this study will contribute to revise the states and improve the national vaccine injury compensation system in Korea.
용탕단조한 (Saffil + C)/AC2B Al 복합재료의 계면반응
이재철,이호인,이정일,김기배 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.9
Interfacial reactions in squeeze cast AC2B Al alloy reinforced with Saffil and Carbon fibers were investigated using scanning and transmission electron microscopy, and secondary ion mass spectrometry. In the case of the as-cast composite, MgO crystals were observed in the vicinity of Saffil fibers. It indicates that the reaction occurred between SiO₂, which was used as a binder to fabricate the preform, and Mg present in the Al alloy during squeeze casting. In the case of T6 treated composite, however, very small MgAl₂O₄ crystals as well as MgO were observed at the surface of the Saffil fibers. Based on SEM and TEM study on the T6 treated composite, the interfacial reactions were observed to occur directly between Al alloy and SiO₂ binder to form both MgO and MgAl₂O₄ crystals. However, a direct reaction between the Al alloy and Saffil fiber were not observed to be significant in T6 treated composite.