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Implementation of Specific Frequency Response Using SOI Photodetector Cell
Jongjun KIM,이종호 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.1
A new silicon-on-insulator (SOI) photodetector was proposed to implement a specific frequency response. The photodetector consists of a photodiode or phototransistor. As an example, a oating body SOI NMOS phototransistor was fabricated by using 1.5-m CMOS technology. The electrical and the optical properties of the transistor were measured and characterized. It was found that a 350-nm-thick n+ polysilicon gate in a phototransistor could filter out optical signals with wavelengths less than 450 nm by absorbing the signals. Gate and drain biases for reasonable operation of the SOI NMOS phototransistor were 0 V to the threshold voltage of the MOSFET and less than about 1.5 V, respectively.
Synthesis and Characterization of Organosilane Electrolyte Containing Silphenylene
Kim, Jongjun,Sohn, Honglae The Basic Science Institute Chosun University 2017 조선자연과학논문집 Vol.10 No.4
Organosilicon compound containing silphenylene unit as an eletrolyte for the application of lithium-ion batteries was synthesized by hydrosilylation method between 1,4-bis(dimethylsilylhydro)benzene and 3-[2-(2-methoxyethoxy)ethoxy]-1-propene. As-prepared new organosilicon compounds containing spacer such as propyl group with ethylene glycol are synthesized to improve thermal stability and to promote conductivity. The products are characterized by spectroscopic analysis.
Experimental Study on Freezing Phenomena of Water Saturated Square Cavity with Inclined Cold Surface
Kim, Jongjun,An, Sangsu,Kim, Byungchul CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.1
It was studied the phenomena of transient freezing of an inclined water-saturated enclosure. One side of the test section was cooled and the other sides were insulated. The effects of the initial temperature, the inclination angle on the temperature field and the shape of the ice-water interface were observed. In the beginning f freezing, when inclination angle increased, the freezing rate was increased and when the water in test section formed the more stable density layer, freezing was faster because the convective fluid flow became small. When the initial temperature was above the 4℃, the frozen thickness in the upper part of inclined surface was thinner than that of the lower part, but with time the frozen thickness of upper part was thicker than that of lower part, below the 4℃, the frozen thickness in the upper part was thicker than that of lower part from the begining, and above the 8℃, upper part was thinner with concave in the beginning.
Behavioral characteristics of phosphorus in sediments according to the forms of phosphorus
Kim, Tae-hoon,Lee, Jongjun,Kim, Jungsoo,Oh, Jong-min The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.3
This study investigates the behavioral characteristics and forms of phosphorus in the sediment according to the oxygen condition (aerobic/anaerobic). In the behavioral characteristics analysis, Al-P and Fe-P concentrations were the highest among the forms of inorganic phosphorus, and therefore had the strongest impact on sorption and release corresponding to environmental condition changes. In the experimental investigation of the inorganic forms of phosphorus in the sediment according to the oxygen condition, we determined that the forms of inorganic phosphorus did not greatly affect the sorption or release reaction because the distribution ratios of the inorganic forms remained constant corresponding to changes of dissolved oxygen (DO) conditions. In contrast, the forms of organic phosphorus in the sediments affected both sorption and release. Furthermore, labile-P and moderately labile-P forms were the major mechanisms of sorption in sediment. Moderately labile-P was the greatest contributor to phosphorus release action in sediment. As environmental changes are important for the behavioral characteristics of phosphorus in sediment, the forms of phosphorus should be considered to have a greater effect, especially in the organic phosphorus case. Therefore, based on the present study results, sediment evaluation aimed at controlling internal pollutants in reservoirs should include an examination of the forms of phosphorus present, as well as the release characteristics of environmental changes, which are influential factors of phosphorus control. Further research in this field is required.