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김형은(Hyung Eun Kim),서영광(Young Kwang Suh),김인배(In Bae Kim),문제도(Je Do Mun),이문규(Moon-Que Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
In this paper, we have designed and fabricated 7-bands (GSM 850/900, DCS/PCS, and UMTS 3 bands) LTCC front end module (FEM) embedded LPF (low pass filter) to efficiently eliminate harmonics generated in TX path. The proposed FEM is composed of flip-chip typed CMOS SP9T switch to select transceiver signals, dual type SAW filters to receive Rx signals, and 0603 size chip components for the antenna matching and ESD protection. The whole size of FEM is 4.5 x 3.2 x 1.2 mm3. The insertion loss of Tx and Rx ports are measured at 1.7 dB and 4.8 dB, respectively.
김학현,이혜진,김형은,이홍신,이병대,이창하,Kim, Hak-Hyeon,Lee, Hye-Jin,Kim, Hyung-Eun,Lee, Hongshin,Lee, Byeong-Dae,Lee, Changha 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.4
For the last couple of decades, the Fenton (-like) systems have been extensively studied for oxidation of organic contaminants in water. Recently, zero-valent iron (ZVI) has received attention as a Fenton catalyst as well as a reducing agent capable of producing reactive oxidants from oxygen. In this study, the ZVI-based Fenton reaction was assessed for the oxidative degradation of phenol using $ZVI/O_2$, $ZVI/H_2O_2$, ZVI/Oxalate/$O_2$ and hv/ZVI/Oxalate/$O_2$ systems. Reaction parameters such as pH and reagent dose (e.g., ZVI, $H_2O_2$, and oxalate) were examined. In the presence of oxalate (ZVI/Oxalate/$O_2$ and hv/ZVI/Oxalate/$O_2$ systems), the degradation of phenol was greatly enhanced at neutral pH values. It was found that ZVI accelerates the Fenton reaction by reducing Fe(III) into Fe(II). The conversion of Fe(III) into Fe(II) by ZVI was more stimulated at acidic pH than at near-neutral pH values.
이상준(Yi, Sang-Jun),김형은(Kim, Hyung-Eun) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.6
Remodeling is a growing number in Japan but, the price trend is not known about the actual situation. We was determine to the status by the analysis with estimate sheet. The analysis was applied statistical techniques that estimate sheet from the three companies was collected over three years. In results of this study, the total floor area, number of building showed that significant impact on construction costs. Potential variables include height, area and construction carried out was determined to affect the condition. In addition, the construction years and repair cycle showed little impact.