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Minagawa, Kentaro,Sumiyoshi, Kazushi Korean Institute of Industrial Engineers 2004 Industrial Engineeering & Management Systems Vol.3 No.2
Studies on the optimal location of retail store have been made in case of no obstacle(Minagawa etal. 1999). This paper deals with the location problem of retail store considering obstacles (e.g. rivers, railways, highways, etc.) and obstacle-overcoming points (e.g. bridges, railway crossings, zebra crossings, overpasses, etc.). We assume that (1) commercial goods dealt here are typically convenience goods, (2) the population is granted as potential demand, (3) the apparent demand is a function of the maximum migration length and the distance from the store to customers, (4) the scale of a store is same in every place and (5) there is no competitor. First, we construct the basic model of customers' behavior considering obstacles and obstacle-overcoming points. Analyzing the two dimensional model, the arbitrary force attracting customers is represented as a height of a cone where the retail store is located on the center. Second, we formulate the total demand of customers and determine the optimal location that maximizes the total demand. Finally, the properties of the optimal location are investigated by simulation.
Hybrid Atomization for Manufacturing Fine Spherical Metal Powder
Minagawa Kazumi,Kakisawa Hideki,Halada Kohmei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Hybrid atomization is a new atomization technique that combines gas atomization with centrifugal atomization. This process can produce fine, spherical powders economically with a mean size of about 10 m diameter and a tight size distribution.
Characteristics of Carrier-generated Field-effect Transistors with Pentacene/Vanadium Pentoxide
M. Minagawa,K. Nakai,A. Baba,K. Shinbo,K. Kato,F. Kaneko,이천 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
In this paper, the driving mechanism of carrier-generated organic field-effect transistors (OFETs) with pentacene and vanadium pentoxide (V_2O_5) layers is discussed. In this study, large on-currents were observed in an OFET with a 35-nm V_2O_5 layer. Devices with aluminum (Al)/pentacene/V_2O_5/Al layer structures were also prepared. These devices exhibited a large current density in spite of their high carrier injection barriers between each layer and the Al electrodes. Moreover, new absorption bands corresponding to the radical cation absorption of pentacene were observed within the absorption spectrum of the pentacene and V_2O_5 mixed layers. It was inferred that the charge transfer (CT) complexes that formed at the interface between the pentacene and V_2O_5 layers were dissociated by the applied gate voltage and that the generated holes contributed to driving the OFETs.
Itsubo, Itsubo, Norihiro,Halada, Halada, Koumei,Minagawa, Minagawa, Kazumi,Yamamoto, Yamamoto, Ryoichi 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
As the direction of development of materials that conscious not only to characters in use, but alos to their effect on environment in the near future, the concept of " Eco-materials" has been proposed. Eco-materials aims to change micro structures for obtaining good characters without the utilization of aditional elements. From this point of view, we paid attention to SCIFER (made from Kobe Steel) which is a hardened fiber due to a cold working (tensile strength shows 5GPa) and has a recyclable formation of Fe-C-Si-Mn. We tried to adhere UFP(Ultra Fine Powder) with SCIFER's surface and investigate the effects for manufacturing composites by using it. Furthermore, we assessed energy consumptions of this material from the view point of environmental evaluation of impacts caused by manufacturing and compared the other materials. Results are as follows. 1. Utilization of solution dispersed UFP made it possible to make a coating film on the surface of fiber. 2. From load-disappointment curve, fracured strength of composite which is mixed powder combined UFP 0.1 weight percentage and fibre adhered UFP uniform are mixed, shows a very high value and also ascend fracture energy remarkably. 3. According to the assessment of Fe-based composite, it proved that Fe-based composite showed lower values than sintered compacts(133373K) for an hour and aluminum(virgin material).material).
Production of Chemistry Laboratory Class for Senior High School Freshmen
Yasuzawa, Mikito,Minagawa, Keiji,Kamitani, Sachiyo,Arai, Yuka,Konishi, Yuki,Nakanishi, Shinsuke,Oshima, Takuya,Yamaguchi, Junko,Ishii, Arisa Korean Society for Engineering Education 2010 공학교육연구 Vol.13 No.5
Chemistry laboratory class was produced for senior high school freshmen with the cooperation of university staffs, high school teachers and the university students. Although the students who will take the lab class are senior high school freshmen, we decided to prepare four experiments that are simple and have highly visible reactions or transformation. That is, 1) Water purification, 2) Surface modification, 3) Briggs-Rauscher reaction, and 4) Polymer synthesis and characterization. After the safety guideline and experiment instructions by the faculty staffs, two teaching assistants (TAs) supervised each experiment. Since taking a direct part in it will provide stronger impact than only being one who is just watching the experiment, all experiments contained some process that the high school students must handle the reagents, tools or the equipment, by themselves. Although, the operation performed by the students was limited to a series of simple actions, the various unique phenomena presented by the experiments impressed the students. The lab class was fruitful not only for high school students, but also good for university students. The lab class provided good opportunity for them to improve the abilities to teach and guide someone.
Fabrication of Nano-laminar Glass Composite Using Thin Flake
Kakisawa Hideki,Minagawa Kazumi,Halada Kohmei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Fabrication of a nano-laminar ceramic composite by sintering thin ceramic plates was examined. Silver-coated glass flakes with a thickness of less than were consolidated by pulsed current sintering or hotpressing to obtain model composites. The samples sintered at the optimum conditions were fairly dense, and the flakes were aligned by uniaxial press. The metal coating remained on the flakes through the sintering process, and became an interface layer between the flakes. No crack propagation through the transverse direction of the lamellar was observed in the indentation test. The possibilities of high resistance against crack propagation was suggested.
Production of Chemistry Laboratory Class for Senior High School Freshmen
Mikito Yasuzawa,Keiji Minagawa,Sachiyo Kamitani,Yuka Arai,Yuki Konishi,Shinsuke Nakanishi,Takuya Oshima,Junko Yamaguchi,Arisa Ishii 한국공학교육학회 2010 공학교육연구 Vol.13 No.5
Chemistry laboratory class was produced for senior high school freshmen with the cooperation of university staffs, high school teachers and the university students. Although the students who will take the lab class are senior high school freshmen, we decided to prepare four experiments that are simple and have highly visible reactions or transformation. That is, 1) Water purification, 2) Surface modification, 3) Briggs-Rauscher reaction, and 4) Polymer synthesis and characterization. After the safety guideline and experiment instructions by the faculty staffs, two teaching assistants (TAs) supervised each experiment. Since taking a direct part in it will provide stronger impact than only being one who is just watching the experiment, all experiments contained some process that the high school students must handle the reagents, tools or the equipment, by themselves. Although, the operation performed by the students was limited to a series of simple actions, the various unique phenomena presented by the experiments impressed the students. The lab class was fruitful not only for high school students, but also good for university students. The lab class provided good opportunity for them to improve the abilities to teach and guide someone.
The nobel solution process using the extreme energy state for anisotropic structured nanomaterials
Tadachika Nakayama,Takashi Minagawa,Shuntaro Suzuki,Hisayuki Suematsu,Koichi Nihara 한국물리학회 2009 Current Applied Physics Vol.9 No.3
A wide variety of materials have been synthesized using procedures that rely on extremely high-energy densities produced by high temperatures and pressures. Anisotropic silver nanomaterials were synthesized by a process that uses high temperatures and pressures in the liquid phase, replacing conventional vacuum production. Powder forms of light-sensitive silver oxide and silver carbonate were dispersed in water and exposed to 355-nm laser illumination, producing nanosheets with a thickness of 10 nm and areas of tens of ㎛2. These large nanosheets of interest since they can be used as structural components of devices having anisotropic electrical and thermal conductivities. A wide variety of materials have been synthesized using procedures that rely on extremely high-energy densities produced by high temperatures and pressures. Anisotropic silver nanomaterials were synthesized by a process that uses high temperatures and pressures in the liquid phase, replacing conventional vacuum production. Powder forms of light-sensitive silver oxide and silver carbonate were dispersed in water and exposed to 355-nm laser illumination, producing nanosheets with a thickness of 10 nm and areas of tens of ㎛2. These large nanosheets of interest since they can be used as structural components of devices having anisotropic electrical and thermal conductivities.