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$C_{x}F_{y}$ Polymer Film Deposition in rf and dc $C_{7}F_{16}$ Vapor Plasmas
Sakai, Y.,Akazawa, M.,Sakai, Yosuke,Sugawara, H.,Tabata, M.,Lungu, C.P.,Lungu, A.M. The Korean Institute of Electrical and Electronic 2001 Transactions on Electrical and Electronic Material Vol.2 No.1
$C_{x}F_{y}$ polymer film was deposited in rf and dc Fluorinert vapor ($C_{7}F_{16}$) plasmas. In the plasma phase, the spatial distribution of optical emission spectra and the temporal concentration of decomposed species were monitored, and kinetics of the $C_{7}F_{16}$ decomposition process was discussed. Deposition of $C_{x}F_{y}$ film has been tried on substrates of stainless steel, glass, molybdenum and silicon wafers at room temperature in the vapor pressures of 40 and 100 Pa. The films deposited in the rf plasma showed excellent electrical properties as an insulator for multi-layered interconnection of deep-submicron LSI, i.e. the low dielectric constant ∼2.0, the dielectric strength ∼2 MV/cm and the high deposition rate ∼100nm/min at 100W input power.
Effect of Activator on Hydrogen Peroxide Bleaching of White Ledger
Sakai, Kokki,Kondo, Ryuichiro,Ahn, Byoung Jun,Paik, Ki Hyon 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.5
The effectiveness of novel activators in the hydrogen peroxide bleaching of white ledger was investigated. With the addition of 1% sodium persulfate, 4% Prestogen EB, and thiourea(molar ratio to residual hydrogen peroxide=1/2) to hydrogen peroxide bleaching, the brightness of the bleached pulps increased by up to 2∼3 points when compared to hydrogen peroxide bleaching with conventional activators. The effectiveness of the activators in enhancing the brightness was in the order of Prestogen EB, thioruea, sodium persulfate and silicates. The strengths of the pulps bleached by hydrogen peroxide with the novel activators were slightly lower or similar to those of the pulps bleached by conventional hydrogen peroxide. In particular, the addition of sodium persulfate produced a more marked decrease in the tensile index of the bleached pulp. Accordingly, sequential oxidative and reductive bleaching with the addition of thiourea to the residual hydrogen peroxide was found to be most effective in view of th bleaching chemical cost, brightness gains, and strength of the bleached pulps.
Establishment of "A-PPNS", A Navigation System for Regenerating the Software Development Business
Sakai, Hirotake,Waji, Yoshihiro,Nakamura, Mari,Amasaka, Kakuro Korean Institute of Industrial Engineers 2011 Industrial Engineeering & Management Systems Vol.10 No.1
Currently, knowledge within the field of software development is largely implicit and is not formally disseminated and shared. This means that there is little improvement and regeneration of processes, and knowledge gained from previous projects is not necessarily applied to new ones. In order to turn this situation around it is necessary to take an organized approach to sharing job-related information. For this study, the authors constructed "Amalab-Project Planning Navigation System, or A-PPNS", a system for organizing accumulated knowledge related to the field of software development. More specifically, A-PPNS is a business process monitoring system and consists of the following four elements: (i) Optimized estimate support subsystem, (ii) Schedule monitoring system, (iii) QCD optimization diagnostic system, and (iv) Strategic technology accumulation system. The effectiveness of this system has been demonstrated and verified at Company A, a system integration company.
Sakai, Koki 한국목재공학회 1992 목재공학 Vol.20 No.3
The application of white-rot fungi to pulping and bleaching processes has been studied at the Wood Chemistry Laboratory in Kyushu University, cooperatively with the Biotechnology Laboratory of Kobe Steel, Ltd. Some successful results of the studies for a biomechanical pulping process, biobleaching of hardwood and softwood kraft pulp, as well as chlorine free biobleaching of oxygen-prebleached hardwood kraft pulp are dealt with. Biological treatment of the pulp bleaching effluent is also described.