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T. Ogawa,M. Nakayama,M. Haraguchi,M. Kuwahara,M. Fukui,S. Matsuo,T. Okamoto 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We have macroscopically and microscopically investigated the localized surface plasmons (LSPs)on Ag anoparticles embedded in porous TiO2 glass. We have prepared TiO2 glass containing Ag nanoparticles (Ag/TiO2) by the sol-gel process and changed the porosity of the TiO2 glass by drying under a high vacuum condition. Using a spectrometer, we have macroscopically measured the absorption spectra (ABS) on all Ag nanoparticles and using near-field scanning optical microscopy (NSOM), we have microscopically measured the scattering spectra on a single Ag nanoparticle in the Ag/TiO2 after each drying process. Fitting the spectra derived from the numerical calculation based on the Mie theory to that evaluated from the ABS and the NSOM measurements, we have evaluated the deviation of the full width at half maximum evaluated by the experimental measurements from that derived from the theoretical calculation (FWHM) and the bound (Hashin-Shtrikman bounds) of the porosity of the TiO2 glass by the use of the Hashin Shtrikman limit, similar to the literature [1]. It has been found that the FWHM of the scattering spectra on the single Ag nanoparticle can be much smaller than one of the ABS on all Ag nanoparticles in the Ag/TiO2. This result is due to that the ABS is influenced by the aggregation and the size distribution of all Ag nanoparticles. Furthermore, on extrapolating from the plot of FWHM vs porosity, the FWHM is reduced to zero when the porosity is about 15 %.
T. Ogawa,K. Seto,D. Hasegawa,H. T. Yang,H. Kura,M. Doi,M. Takahashi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method has been developed. As a result, fast nucleation process promotes formation of ~4 ㎚ of initial nucleus with a non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled surface precipitation mode (< 100 atoms/(minㆍ㎚²)) can form the growth layer on the surface of initial nucleus with high saturation magnetization (~190 emu/gFe) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO)? should be one of the key issues to achieve much higher Ms of Fe NPs.
Detection of defects in CZ Si wafers by light scattering tomography
T.Ogawa 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.3
Improving the quality of Czochralski method grown (CZ) Si wafers is one of the ever-lasting and very important problems to be solved. Since the keys for this improvement are effective characterization of the crystals, many ways have been developed and reported already. While light scattering tomography or laser scanning tomography (LST) to be discussed here is only one of these methods, it is very useful to detect micro-precipitates and tiny defects in the crystals such as oxygen precipitates or micro-bulk defects (MBD), aggregated vacancies (COP) and entangled dislocations in silicon crystals and misfit dislocations located between substrates and epitaxial layers.
Togawa, Nozomu,Sato, Masao,Ohtsuki, Tatsuo 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
This paper proposes a circuit partitioning algorithm in which the delay of each critical signal path is within a specified upper bound. Its core is recursive bipartitioning of a circuit which consists of three stages: 0) detection of critical paths; 1) bipartitioning of a set of primary inputs and outputs; and 2) bipartitioning of a set of logic-blocks. In 0), the algorithm detects the critical paths based on their lower bounds of delays. The delays of the critical paths are reduced with higher priority. In 1), the algorithm attempts to assign the primary input and output on each critical path to one chip. In 2), the algorithm not only decreases the number of crossings between chips but also assigns the logic-blocks on each critical path to one chip by exploiting a network flow technique with logic-block replication. The experimental results demonstrate that it resolves almost all path delay constraints with maintaining the maximum number of required I/O blocks per chip small compared with conventional algorithms.
Background of the automobile recycling law enactment in Japan
Togawa, Kenichi The Korean Institute of Resources Recycling 2005 資源 리싸이클링 Vol.14 No.3
일본에서는 2002년 1월 5일 흔히 "자동차재활용법"이라고 알려진 '폐자동차 재활용에 관한 법률'이 시행되었다. 본 고에서는 이 법의 특징들과 제정된 배경 및 이 법이 향후 일본 자동차 산업에 미칠 수 있는 영향들을 살펴보고자 한다. 이 법에 따라서 현재 일본의 자동차 재활용 시스템은 2005년 1월 1일부터 새로운 형태로 바뀌었다. On July 5,2002 the Law Concerning Recycling of End-of Life Vehicles popularly known as the "Automobile Recycling Law" was enacted in Japan. This paper examines the features of this Law, reasons why the Law was brought into existence, and its predicted impacts on the automobile industry. Pursuant to the Law, the current automobile recycling system was replaced by a new one in January 1, 2005.
Matsuno, Shota,Togawa, Masashi,Yanagisawa, Masao,Kimura, Shinji,Sugibayashi, Tadahiko,Togawa, Nozomu The Institute of Electronics and Information Engin 2013 IEIE Transactions on Smart Processing & Computing Vol.2 No.4
A number of systems have several on-chip memories with cache memory being one of them. Conventional cache memory consists of SRAM but the ratio of static energy to the total energy of the memory architecture becomes larger as the leakage power of traditional SRAM increases. Spin-Torque Transfer RAM (STT-RAM), which is a variety of Non-Volatile Memory (NVM), has many advantages over SRAM, such as high density, low leakage power, and non-volatility, but it consumes too much writing energy. This study evaluated a wide range of energy consumptions of a two-level cache using NVM partially on a mobile processor. Through a number of experimental evaluations, it was confirmed that the use of NVM partially in the two-level cache effectively reduces energy consumption significantly.