• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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• pp.219-222
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• 2004

Removal characteristics of Mn and Co was studied from the contaminated solutions via surface reaction with various calcium carbonate (calcite). Synthetic calcium carbonates which has different surface morphology as well as surface areas were prepared by a spontaneous precipitation method and used. Mn and Co removal behavior by the different solid surface demonstrate characteristic sorption behaviors depend on the type of calcite used, such as surface area or surface morphology. Calcium carbonate crystals (mostly calcite) which exhibit complicated surface morphology (c-type) shows strong sorption affinity for Mn and Co removal via sorption than on the a-type or b-type calcite crystals of less complicated surfaces. The applicability of two kinetic models, the pseudo-first-order kinetic equation and the Elovich kinetic model was examined on these sorption behavior. Elovich kinetic model was found more suitable to explain the very early stage adsorption kinetics, while the pseudo-first-order kinetic equation was successfully fitted for the adsorption kinetics after 50 hours.

• Journal of the Korean Wood Science and Technology
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• 제23권3호
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• pp.73-82
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• 1995

Black locust trees(Robinia pseudo-acacia L.) are growing widely in Korea and have been used to get honey and animal feed, but they have seldom been used as manufacturing materials. This study was carried out to evaluate the possibility of using black locust as bent-wood furniture materials. Softening methods were steaming and micro-wave heating. The specimens of 15${\times}$15${\times}$350mm were all air-dried. For softening, specimens were steamed at 100$^{\circ}C$ for 7 min, or microwave heated for 35 seconds. It is known that microwave heating softens wood much faster than steaming. The bending processing conditions are showed in Table 7. The minimum solid-bending radii of black locust were 40mm for steaming and 150mm for micro-wave heating, respectively. In conclusion the steamed black locust, showed very good solid bending properties, but the bending properties of micro-wave heated black locust were not sufficient for bent-wood furniture.

• 한국환경과학회지
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• 제18권4호
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• pp.369-374
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• 2009

To examine the trend on the flowering time in some weather flora including Prunus serrulata var. spontanea, Cosmos bipinnatus, and Robinia pseudo-acacia in Busan, the changes in time series and rate of flowering time of plants were analyzed using the method of time series analysis. According to the correlation between the flowering time and the temperature, changing pattern of flowering time was very similar to the pattern of the temperature, and change rate was gradually risen up as time goes on. Especially, the change rate of flowering time in C. bipinnatus was 0.487 day/year and showed the highest value. In flowering date in 2007, the difference was one day between measurement value and prediction value in C. bipinnatus and R. pseudo-acacia, whereas the difference was 8 days in P. mume showing great difference compared to other plants. Flowering time was highly related with temperature of February and March in the weather flora except for P. mume, R. pseudo-acacia and C. bipinnatus. In most plants, flowering time was highly related with a daily average temperature. However, the correlation between flowering time and a daily minimum temperature was the highest in Rhododendron mucronulatum and P. persica, otherwise the correlation between flowering time and a daily maximum temperature was the highest in Pyrus sp.

• 한국응용과학기술학회지
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• 제25권1호
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• pp.23-31
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• 2008

In general, anionic and cationic surfactants are incompatible because their mixtures form insoluble complexes. There are, however, some complexes that are soluble and behave like regular surfactants, specifically like nonionic surfactants, thus named pseudo-nonionic surfactant complexes. Pseudo-nonionic complexes are more effective and efficient than their ionic surfactant components as shown by their equilibrium and dynamic surface tensions and interfacial tensions. They pack at the interface more than their ionic components. Since, pseudo-nonionic complexes show their own characteristics, they can be treated as separate classes of surfactants distinct from ionic and nonionic surfactants. Novel cationic surfactant was synthesized, having the polyhydroxyl group at the head group. We found that aqueous mixtures of our cationic surfactant and usual anionic surfactant(SDS) could form homogeneous solutions even at high concentration. The properties of mixed surfactant solutions were measured. Foam stability, CMC(critical micelle concentration), water hardness tolerance and thickening effect were tested. The foam stability of mixed surfactants was very good and various synergy effects were observed.

• Journal of Forest and Environmental Science
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• 제27권1호
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• pp.17-22
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• 2011

Based upon the vegetation data of woody plants by plot sampling method in the natural deciduous forest of Mt. Jeombong, the study was carried out to examine importance value, rank abundance curve, and species abundance curve, and comparatively evaluate seven different species diversity indices for Shannon-Wiener index, Simpson index, McIntosh index, Log series, Margalef index, Berger-Parker index, and species richness, according to topographic positions. The minimal area which meant only few more species were increased was 3.48 ha in total. The dominant species of valley were Carpinus cordata, Acer pseudo-sieboldianum, Quercus mongolica, Acer mono, and Abies holophylla, and the dominant species of mid-slope were Quercus mongolica, Acer pseudo-sieboldianum, Carpinus cordata, Tilia amurensis, and Fraxinus rhynchophylla. Moreover, the dominant species of ridge were Quercus mongolica, Acer pseudo-sieboldianum, Tilia amurensis, Fraxinus rhynchophylla, and Acer mono. According to rank abundance curve and species abundance curve, species evenness was also low. All of Log series, species richness, Margalef, and Shannon-Wiener index discriminated that valley had the highest diversity, and ridge had the lowest diversity; but, Simpson index, McIntosh index, and Berger-Parker index represented that mid-slope had the highest diversity, and ridge had the lowest diversity. Uniquely, in Berger-Parker index, mid-slope was the higher value than total.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2007년도 The 1st International Symposium on Advanced Magnetic Materials
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• pp.280.1-280.1
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• 2007

• 센서학회지
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• 제21권6호
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• pp.413-419
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• 2012

A dynamic range extension technique is proposed based on a 3-transistor active pixel sensor (APS) with gate/body-tied p-channel metal oxide semiconductor field effect transistor (PMOSFET)-type photodetector using a feedback structure. The new APS consists of a pseudo 3-transistor APS and an additional gate/body-tied PMOSFET-type photodetector, and to extend the dynamic range, an NMOSFET switch is proposed. An additional detector and an NMOSFET switch are integrated into the APS to provide negative feedback. The proposed APS and pseudo 3-transistor APS were designed and fabricated using a $0.35-{\mu}m$ 2-poly 4-metal standard complementary metal oxide semiconductor (CMOS) process. Afterwards, their optical responses were measured and characterized. Although the proposed pixel size increased in comparison with the pseudo 3-transistor APS, the proposed pixel had a significantly extended dynamic range of 98 dB compared to a pseudo 3-transistor APS, which had a dynamic range of 28 dB. We present a proposed pixel that can be switched between two operating modes depending on the transfer gate voltage. The proposed pixel can be switched between two operating modes depending on the transfer gate voltage: normal mode and WDR mode. We also present an imaging system using the proposed APS.

• 전자공학회논문지SC
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• 제48권6호
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• pp.24-33
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• 2011

본 논문은 다른 종류의 프로토콜을 가지는 자동차 네트워크를 통합하기 위해 MOST 네트워크를 백본으로 하는 게이트웨이 시스템에 대한 것이다. 서로 다른 프로토콜들의 상위 계층의 메시지와 데이터 구조에 상관없이 서로간의 통신을 위해 MOST와 비슷한 구조를 가지는 Pseudo MOST 프로토콜을 설계하여 이를 데이터 수송을 위한 매개체로 이용하였다. 자동차 네트워크에 적용하기위해 일체형 게이트웨이와 소형 독립형 게이트웨이 두 가지 타입이 개발되었다. 일체형 게이트웨이는 이더넷포트, 영상 및 음성 포트를 가지고 있는 반면 소형 독립형 게이트웨이는 영상, 음성, 블루투스 그리고 Flexray용으로 각각 개발 되었다. 소형 독립형 게이트웨이를 이용한 네트워크 시스템 실험을 통해 개발된 게이트웨이가 서로 다른 프로토콜간의 데이터 송수신이 효율적으로 수행될 수 있음을 보여주었고 자동차 네트워크 통합용으로도 활용이 가능함을 보여주었다.

• 한국전자통신학회논문지
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• 제14권1호
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• pp.87-96
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• 2019

유기 박막 트랜지스터 (OTFT) 백플레인을 이용한 유연한 유기 발광 다이오드 (OLED) 디스플레이가 연구되고 있다. OLED 디스플레이의 구동을 위해서 게이트 드라이버가 필요하다. 저온, 저비용 및 대 면적 인쇄 프로세스를 사용하는 디스플레이 패널의 내장형 게이트 드라이버는 제조비용을 줄이고 모듈 구조를 단순화한다. 이 논문에서는 유연한 OLED 디스플레이 패널의 내장형 게이트 드라이버 제작을 위하여 OTFT를 사용한 의사 CMOS (pseudo complementary metal oxide semiconductor) 로직 게이트를 구현한다. 잉크젯 인쇄형 OTFT 및 디스플레이와 동일한 프로세스를 사용하여 유연한 플라스틱 기판 상에 의사 CMOS 로직 게이트가 설계 및 제작되며, 논리 게이트의 동작은 측정 실험에 의해 확인된다. 최대 1 kHz의 입력 신호 주파수에서 의사 CMOS 인버터의 동작 결과를 통하여 내장형 게이트 드라이버의 구현 가능성을 확인하였다.

• 천문학회보
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• 제34권2호
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• pp.38.1-38.1
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• 2009