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Tsuyoshi Kurihara,Takaaki Kawanaka,Hiroshi Yamashita 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.4
In general, seasonally dependent products such as home air conditioners and beer are difficult to produce in a timelymanner to respond to demand because of the large seasonal fluctuations in demand. However, if highly accurate demand analysis/forecast is possible, production preparation for responding to demand fluctuations will be easier. Therefore, as a basis for such a demand analysis/forecast, to analyze the whole (nationwide) demand for a seasonally dependent product, this paper proposes a new weighted additive model for the whole demand analysis of a seasonallydependent product, i.e., Japanese beer, using meteorological and regional data, considering “regional characteristics ofclimate” and “regional homogeneity of demand together,” with the further addition of social customs factors, policyfactors, and a demand trend. Using the alternating least squares method, we attempt parameter estimation for the model with an inseparable parameter group generated by expressing “regional characteristics of climate” and “regionalhomogeneity of demand” together as a product of mutually independent factors (meteorological and regional factors). The results show that the proposed model is valid and provides insight into the effects of the factors influencing demand.
X-Band GaN HEMT Advanced Power Amplifier Unit for Compact Active Phased Array Antennas
Yuusuke Yamashita,Taihei Nakada,Tsuyoshi Kumamoto,Ryota Suzuki,Masahiro Tanabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A compact power amplifier unit for X-band solid-state Active Phased Array Antennas (APAAs) has been developed. Its major features are, (1) high power GaN (Gallium Nitride) HEMT is employed, (2)16 transmit MICmodules are arrayed in line on a thin flat printed wiring board (PWB), (3) output power is 30W (pulse) at eachtransmit-output port of the unit, hence 480 W in total, and (4) other necessary functions for phased array antennas, such as digital phase-shifters and RF dividers, are all included in this PWB. Resulting electrical measured data are presented in detail in the paper, proving that further power and frequency range increase for APAAs would become feasible by the concepts employed in this unit design.
Akihiro Furuta,Hiroyoshi Isoda,Tsuyoshi Ohno,Ayako Ono,Rikiya Yamashita,Shigeki Arizono,Aki Kido,Naotaka Sakashita,Kaori Togashi 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.1
Objective: To selectively visualize the left gastric vein (LGV) with hepatopetal flow information by non-contrast-enhanced magnetic resonance angiography under a hypothesis that change in the LGV flow direction can predict the development of esophageal varices; and to optimize the acquisition protocol in healthy subjects. Materials and Methods: Respiratory-gated three-dimensional balanced steady-state free-precession scans were conducted on 31 healthy subjects using two methods (A and B) for visualizing the LGV with hepatopetal flow. In method A, two time-spatial labeling inversion pulses (Time-SLIP) were placed on the whole abdomen and the area from the gastric fornix to the upper body, excluding the LGV area. In method B, nonselective inversion recovery pulse was used and one Time-SLIP was placed on the esophagogastric junction. The detectability and consistency of LGV were evaluated using the two methods and ultrasonography (US). Results: Left gastric veins by method A, B, and US were detected in 30 (97%), 24 (77%), and 23 (74%) subjects, respectively. LGV flow by US was hepatopetal in 22 subjects and stagnant in one subject. All hepatopetal LGVs by US coincided with the visualized vessels in both methods. One subject with non-visualized LGV in method A showed stagnant LGV by US. Conclusion: Hepatopetal LGV could be selectively visualized by method A in healthy subjects.
Encapsulation of Submicron-sized Silica Particles by Stimuli-responsive Copolymer Shell Layer
M. Abdur Rahman,M. Rabiul Karim,M. A. Jalil Miah,Hasan Ahmad,Tsuyoshi Yamashita 한국고분자학회 2010 Macromolecular Research Vol.18 No.3
This study examined the encapsulation of submicron-sized silica particles by stimuli-responsive copolymer shell layer. Silica/poly(2-dimethylaminoethyl methacrylate-N-isopropylacrylamide-ethyleneglycol dimethacrylate),abbreviated as silica/P(DM-NIPAM-EGDM) core-shell composite polymer particles, were prepared by the seeded copolymerization of DM, NIPAM and EGDM in the presence of silica particles. The morphology and size distribution were analyzed by scanning electron microscopy. The surface composition showed silica particles covered with a copolymer shell layer consisting of P(DM-NIPAM-EGDM). The temperature and pH dependent adsorption behavior of the low molecular weight surfactants and biomolecules on the silica/P(DM-NIPAM-EGDM) composite polymer particles indicated a stimuli-responsive phase transition. The activity of the adsorbed trypsin (TR) on the composite particles remained high compared to the free TR and adsorbed TR on silica particles.