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정종배,사동민 선문대학교 ·중소기업기술지원연구소 1999 선문공대 연구/기술 논문집 Vol.4 No.1
칼슘의 엽면시비가 토마토의 수량 및 품질에 미치는 영향을 살펴보고저 칼슘비료를 0, 2 및 3회 처리한 후 수량 병해발생률, 칼슘함량 및 과육의 파괴강도를 측정하였다 칼슘의 엽면시비는 과실의 생체량 및 과실 개당 무게에는 유의성 있는 차이를 나타내지 않았으나 병해발생률 감소 및 칼슘농도 증가는 유의성 있는 차이를 나타내었다 이는 칼슘의 엽면시비가 수량에는 영향을 미치지 못하나 토마토 과육에 칼슘함량을 높여 파괴강도를 증가시키고 병해발생률을 감소시키는 것으로 생각된다. The objective of this study was to examine the effect of Ca foliar application on yield, disease occurrence, Ca content and texture of tomato after growing with Ca-foliar application (0, 2 and 3 times). The yield of tomato was not affected by Ca-foliar application but Ca-foliar application decreased the occurrence of disease and increased Ca-concentration of tomato significantly. These results showed that Ca-foliar application had no significant effect of yield but enhanced the quality (disease occurrence, texture) by increasing Ca concentration in tomato.
New Rail-to-Rail Column Driver for 8-bit Large TFT LCD Applications
Kyusik Lee,Jongbae Son,Wooram Lee,Sooyang Park,Sanghee Son,Wonsup Chung 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, a high-speed low-power column driver using a new rail-to-rail scheme is proposed, designed and evaluated for large TFT LCD applications. The proposed output driver is composed of a differential amplifier stage, second amplifier stage, driver selector, dual push-pull output driver stage for rail-to-rail output driving and feedback path selector. The output driver amplifier achieves a very large driving capability by eliminating the RON of the output switches used for polarity control. This increases the output driving speed while retaining low quiescent current consumption and can minimize the area of the output driving transistors and switches used for output polarity inversion. The quiescent current consumptions for the PMOS input driver and NMOS input driver are 10uA/channel on average.
Sherlyn C. Tipayno,Puneet S. Chauhan,Sungman Woo,Bohee Hong,Keewoong Park,Jongbae Chung,Tongmin Sa 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.1
The continuous increase in the production of metals and their subsequent release into the environment has lead to increased concentration of these elements in agricultural soils. Because microbes are involved in almost every chemical transformations taking place in the soil, considerable attention has been given to assessing their responses to metal contaminants. Short-term and long-term exposures to toxic metals have been shown to reduce microbial diversity, biomass and activities in the soil. Several studies show that microbial parameters like basal respiration, metabolic quotient, and enzymatic activities, including those of oxidoreductases and those involved in the cycle of C, N, P and other elements, exhibit sensitivity to soil metal concentrations. These have been therefore, regarded as good indices for assessing the impact of metal contaminants to the soil. Metal contamination has also been extensively shown to decrease species diversity and cause shifts in microbial community structure. Biochemical and molecular techniques that are currently being employed to detect these changes are continuously challenged by several limiting factors, although showing some degree of sensitivity and efficiency. Variations and inconsistencies in the responses of bioindicators to metal stress in the soil can also be explained by differences in bioavailability of the metal to the microorganisms. This, in turn, is influenced by soil characteristics such as CEC, pH, soil particles and other factors. Therefore, aside from selecting the appropriate techniques to better understand microbial responses to metals, it is also important to understand the prevalent environmental conditions that interplay to bring about observed changes in any given soil parameter.
Exploring the Potential of Bacteria-Assisted Phytoremediation of Arsenic-Contaminated Soils
Charlotte C. Shagol,Puneet S. Chauhan,Kiyoon Kim,Sunmi Lee,Jongbae Chung,Keewoong Park,Tongmin Sa 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.1
Arsenic pollution is a serious global concern which affects all life forms. Being a toxic metalloid, the continued search for appropriate technologies for its remediation is needed. Phytoremediation, the use of green plants, is not only a low cost but also an environmentally friendly approach for metal uptake and stabilization. However, its application is limited by slow plant growth which is further aggravated by the phytotoxic effect of the pollutant. Attempts to address these constraints were done by exploiting plant-microbe interactions which offers more advantages for phytoremediation. Several bacterial mechanisms that can increase the efficiency of phytoremediation of As are nitrogen fixation, phosphate solubilization, siderophore production, ACC deaminase activity and growth regulator production. Many have been reported for other metals, but few for arsenic. This mini-review attempts to present what has been done so far in exploring plants and their rhizosphere microbiota and some genetic manipulations to increase the efficiency of arsenic soil phytoremediation.