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그라프트화 전분의 제조 : 중합방법에 따른 스티렌 그라프트 효율
조창기,이기호,우상원,황승식,최종범 ( C . G . Cho,K . H . Lee,S . W . Woo,J . B . Choi,S . S . Hwang ) 한국공업화학회 1997 공업화학 Vol.8 No.5
전분의 친수성 및 반응성을 조절하기 위하여 propylene oxide, 1,2-epoxybutane, glycidyl methacrylate, maleic anhydride, caprolactone 등을 반응시켰으며 건조되지 않은 전분을 사용할 경우 propylene oxide, maleic anhydride 외에는 반응 수율이 아주 낮아지는 것이 관찰되었다. 이렇게 개질된 전분을 스티렌과 반응시켜 그라프트 공중합물로 전환하였으며 여러가지 중합방법에 대한 그라프트 수율이 비교되었다. 그라프트 중합반응의 경우 용액중합 및 cerium(IV)이온에 의한 중합은 각각 낮은 효율과 수율을 보였다. 현탁중합 방법으로는 전분 입자의 친수성 때문에 폴리스티렌으로 전분을 encapsulation 하기가 어려웠으며, 유화중합이 스티렌을 그라프트 시키기에 제일 적당한 방법임을 알 수 있었다. The corn starch was treated with propylene oxide, 1,2-epoxybutane, glycidyl methacrylate, maleic anhydride, caprolactone, respectively, in order to alter the hydrophilicity and the reactivity of starch. When the starch was not dried, poor reaction was observed except the reaction with propylene oxide or maleic anhydride. The treated starches were grafted with styrene by several different polymerization methods. Solution polymerization and redox polymerization using cerium(IV) ion show poor grafting efficiency and poor yield. Encapsulation of starch with polystyrene by suspension polymerization was difficult due to the hydrophilicity of the starch. Among the examined methods, emulsion polymerization was found to be the suitable way to graft styrene onto starch.
간헐 회전식 약실을 적응한 자동포 시스템의 디지털 제어
임승철,김기갑,심정수,길성진,김홍철,이건하,차기업,조창기,홍석균,Lim, S.C.,Kim, K.K.,Shim, J.S.,Kil, S.J.,Kim, H.C.,Lee, G.H.,Cha, G.U.,Cho, C.K.,Hong, S.K. 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.2
Lately, there exist growing demands to increase the firepower of mid-calibre automatic guns despite spatial limitations of armament. In this context, ammunitions of simple cylindrical shape are considered so advantageous that associated automatic guns are under development incorporating an intermittently rotating chamber mechanism. In this paper, relevant subsystems for such guns are to be described, and a digital controller to automate the entire system as well. Via dynamic simulations it proves to function well being able to drive the chamber at any constant speed up to 200spm, which is merely limited by the recoil performance. It is remarkable that the system synchronization idea in use is applicable to any other multi-actuator systems that should operate on the basis of event rather than time.
임승철,김기갑,심정수,길성진,이건하,차기업,조창기,홍석균,Lim, S.,Kim, K.K.,Shim, J.S.,Kil, S.J.,Lee, G.H.,Cha, G.U.,Cho, C.K.,Hong, S.K. 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.1
Lately, there exist growing demands for the use of CTAs(Cased Telescoped Ammunitions) to increase the firepower of mid-calibre automatic guns despite spatial limitations of armament. In this paper, for automatic CTA guns a rotating chamber mechanism is designed based on parallel index concept. Via dynamic simulations it proves capable of smooth operation even at as high a firing rate as 200spm. Subsequently, motor controllers are synthesized to drive the chamber at any constant speed and also to control positions in the presence of large disturbances caused by the intermittently-rotating load. It is remarkable that we successfully adopted a disturbance observer to treat disturbances only with a moderate bandwidth of the closed-loop system.