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최형진,전영희,고석준 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.10
A conventional digital receiver sampled a baseband signal and processed it digitally for demodulation. But now we can sample at sufficiently high speed a wideband signal to take enough discrete data values due to the advent of economic high-speed ADC. With this technical background, a wideband frequency-division-multiplexed signal can be undersampled and channelized in digital domain by DFT analysis filter using the theory of polyphase. In this paper, we propose a new digital receiver which can digitally process the multichannel received signal by sampling at IF band, develop a mathematical theory and algorithm, and analyze the performance by using C-language simulaation. The proposed receiver can demodulate analog and digital FM signals.
Electrorheological Characteristics of Poly(o-ethoxy)aniline Nanocomposite
최형진,성준희 한국유변학회 2004 Korea-Australia rheology journal Vol.16 No.4
Poly(o-ethoxyaniline) (PEOA)/organoclay nanocomposite was prepared via a solvent intercalation using chloroform as a cosolvent with organically modified montmorillonite (OMMT) clay. The PEOA initially synthesized from a chemical oxidation polymerization in an acidic condition at pH =1 was intercalated into interlayers of the clay with 25wt% clay content. Electrical conductivity of the PEOA/OMMT nanocomposite was found to be controlled via the intercalating process. The synthesized PEOA/OMMT nanocomposite was characterized via an XRD and a TGA, and then adopted as an electrorheological (ER) material. The PEOA/OMMT synthesized with controllable electrical conductivity without a dedoping process was found to show typical ER characteristics possessing a yield stress from both steady state and dynamic measurements under an applied electric field.
최형진,Choe, Hyeong-Jin 한국정보통신집흥협회 1997 정보화사회 Vol.110 No.-
이동 위성통신서비스란 위성을 이용하여 이동통신을 제공하는 서비스를 모두 포함한다고 일단 정의할 수 있다. 그러나 이동위성통신서비스를 제공할 수 있는 위성방식에는 여러가지가 있으며, 구체적으로는 궤도에 따라 정지궤도, 저궤도, 중궤도 등이 가능함으로 이들 위성방식을 모두 이동위성통신서비스를 위해 필요한 방식으로 규정하는 것이 타당하다.
Shear stress analysis of phosphorylated potato starch based electrorheological fluid
최형진,홍정해 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.4
oil investigated via a rotational rheometer equipped with a high voltage generator is being reanalysized.Flow curves of these ER fluids both under several applied electric field strengths and with different degreesof phosphate substitution were mainly examined via thre different rheological constitutive equations ofBingham model, De Kee-Turcotte model and our previously proposed CCJ model. Among these, the CCJequation was found to fit the data of phosphorylated potato starch well.