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- 저자 : Nishikawa, Ken (검색결과 141 건)
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NISHIKAWA, SEIKI TOPOLOGY AND GEOMETRY RESEARCH CENTER 1994 Proceedings of the Topology and Geometry Research Vol.5 No.-
These lectures are meant to discuss the existence problem of harmonic maps of surfaces. Starting with the general theory of harmonic maps, we will focus the lectures on existence/nonexistence of harmonic maps between compact/noncompact Riemann surfaces
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Function-level module sharing techniques in high-level synthesis
Nishikawa, Hiroki,Shirane, Kenta,Nozaki, Ryohei,Taniguchi, Ittetsu,Tomiyama, Hiroyuki Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.4
High-level synthesis (HLS), which automatically synthesizes a register-transfer level (RTL) circuit from a behavioral description written in a high-level programming language such as C/C++, is becoming a more popular technique for improving design productivity. In general, HLS tools often generate a circuit with a larger area than those of hand-designed ones. One reason for this issue is that HLS tools often generate multiple instances of the same module from a function. To eliminate such a redundancy in circuit area in HLS, HLS tools are capable of sharing modules. Function-level module sharing at a behavioral description written in a high-level programming language may promote function reuse to increase effectiveness and reduce circuit area. In this paper, we present two HLS techniques for module sharing at the function level.
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Electrical properties of ABS resin reinforced with recycled CFRP
Nishikawa, Takashi,Ogi, Keiji,Tanaka, Toshiro,Okano, Yasutaka,Taketa, Ichiro The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.1
Composite materials consisting of crushed carbon fiber reinforced plastics (CFRP) pieces and acrylonitrile-butadiene-styrene (ABS) resin were prepared by an injection mold method to solve the problem of recycling of CFRP. The electrical properties, such as electrical resistivity, alternating current impedance and electromagnetic interference (EMI) shielding effect, were measured for the composites. The electrical resistivity of the composites showed a percolation type of conduction behavior and no difference between parallel and perpendicular to the injection direction was observed for CFRP content higher than the critical value. Measurement of alternating current impedance revealed that the conduction mechanism is attributed to the direct conductive paths generated by distributed carbon fibers; however, strong frequency dependence of the impedance was observed for the CFRP content near the critical one. The frequency dependence of the impedance is caused by the inter-fiber connection and can be expressed as a simple equivalent circuit. The absorption component of shielding effect (SE) was smaller than the expected value estimated from its resistivity. The decline of SE is thought to be caused by the decrease in effective thickness due to fiber orientation.
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Nishikawa, Harumitsu,Takahara, Yasumitsu,Takagi, Osamu,Tsuneyoshi, Koji,Kato, Katsuyoshi,Ihara, Tadayoshi,Wakai, Kazunori Korean Society for Atmospheric Environment 2008 Asian Journal of Atmospheric Environment (AJAE) Vol.2 No.2
A new-type apparatus decomposing volatile organic compounds (VOCs) using a combination system of an electrical exothermic SiC honeycomb and a catalytic filter was developed. This linear combination system is very useful to the catalytic decomposition of VOCs, because the gas involving VOCs is well heated in the SiC honeycomb and then flows into the catalytic filter. In the proposed apparatus, the outlet gas temperatures of SiC honeycomb maintained at ca. $300^{\circ}C$ after 5 min from the starting of applying electric current, and sufficient for the catalytic degradation of VOC components, i.e. toluene, isopropanol, methyl ethyl ketone and ethyl acetate. The average decomposition rate of total VOCs exhausted from a printing factory was 85% using pt catalyst at SV=19,000 in this system.
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Nishikawa, M.,Okabe, T.,Takeda, N. The Korean Society for Composite Materials 2009 Advanced composite materials Vol.18 No.1
This paper investigated the damage transition mechanism between the fiber-breaking mode and the fiber-avoiding crack mode when the fiber-length is reduced in the unidirectional discontinuous carbon fiber-reinforced-plastics (CFRP) composites. The critical fiber-length for the transition is a key parameter for the manufacturing of flexible and high-strength CFRP composites with thermoset resin, because below this limit, we cannot take full advantage of the superior strength properties of fibers. For this discussion, we presented a numerical model for the microscopic damage and fracture of unidirectional discontinuous fiber-reinforced plastics. The model addressed the microscopic damage generated in these composites; the matrix crack with continuum damage mechanics model and the fiber breakage with the Weibull model for fiber strengths. With this numerical model, the damage transition behavior was discussed when the fiber length was varied. The comparison revealed that the length of discontinuous fibers in composites influences the formation and growth of the cluster of fiber-end damage, which causes the damage mode transition. Since the composite strength is significantly reduced below the critical fiber-length for the transition to fiber-avoiding crack mode, we should understand the damage mode transition appropriately with the analysis on the cluster growth of fiber-end damage.
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Minami Nishikawa 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
Introduction Japanese convenience-store (CVS) chain retailers have grown by establishing store networks. In fact, Seven-Eleven, Lawson and Family Mart continuingly have opened about 1000 new stores per year. The reason for the rapid growth of their store-networks is that a key aspect of a chain retailer’s marketing strategy is the number of stores its needs to reach its customers (Srinivasan et al. 2013). In particular, CVS chain retailers seek to open new stores and obtain spatial dominance in a particular geographical area, which is called “area-dominance strategy,” so they can save on logistical costs, increase consumer proximity and loyalty, and prevent rival from opening new stores in the area (Ogawa 2004, Tamura 2014, Nishida 2014). Thus, a retailer’s decision of how to expand store-network in a given regional market is important to improve its sales. However, little attention has been paid to this problem in Japanese academic research. This study attempts to explain the influence of entry of rivals on a focal retailer’s store-network in regional markets of Japanese CVS industry. Especially, the author focuses on the regional competition between a focal retailer who is the first entrant and rivals who are late entrants in the region. First, we review prior research, and then propose hypotheses about the influence of entry of rivals, the degree of dominance of a focal retailer, and entry of rivals in multiple regions, on the number of the focal retailer stores. This is followed by an empirical analysis with panel data. Last, we discuss some implications and direction for future research. Literature Review and Proposed Hypothesis Entry of rival stores Prior research suggests that the existence of rival chain stores in the same market decreases the store-revenue of the focal retailer (Erickson et al. 2013, Nishida 2014).When rival retailers open the large number of new stores in a regional market, the focal retailer may be taken away their business of existing stores and latent new stores, so the focal retailer will be forced to close existing stores and slow down the pace of opening new stores. Then, we propose following hypothesis: H1: In a regional market, the higher the number of net increase of rival stores is, the lower the net increase of focal retailer stores is. Dominance of the focal retailer According to prior research, CVS chain retailers benefit from area-dominance (opening own stores aggressively in a given region), because it enables retailers to reduce their distribution and promotion cost, increase consumer loyalty and their power against manufactures (Ogawa 2004, Tamura 2014, Nishida 2014). If the focal retailer has already established a high density store-network, and had strong relationships with its customers and manufactures in the regional market, they will be less likely to suffer from entry of rival chain stores, and they will be able to continue expanding their store-network. These arguments lead to: H2: In a regional market, the higher the degree of dominance of the focal retailer is, the smaller the negative effect of entry of rival stores is. Entry of rival stores in multi-market Though H1 and H2 do not consider multi-market competition among chain retailers, this macro-level competition may have a great impact on their competitive action in a given region (Chen 1996). When a rival entries to multiple regions simultaneously where the focal retailer has already operated, the focal retailer will delay its decision making and competitive responses, so the impact of entry of rival will be larger (Poter 1980, Ferrir 2001, Boyd and Bresser 2008). Therefore, we propose following hypotheses: H3a: The higher the number of regions which rival entry is, the bigger the negative effect of entry of rival chain stores is. H3b: The higher the number of net increase of rival stores across the regions is, the bigger the negative effect of entry of rival chain stores is. Methodology To test the proposed hypotheses (see FIGURE 1), we collected panel data from the Census of CVS Market, which includes the number of stores of Japanese CVS chain retailers in each prefecture. Due to the restriction of data availability, we treated prefectures as the unit of regional market, and focused on the cases that Lawson was the first entrant, and Seven-Eleven and Family-Mart ware the later entrants in prefectures. Accordingly, the sample was limited in space to 17 prefectures, and limited in time to the period from the year that Seven-Eleven or Family-Mart opened their stores for the first time to 2014. Results We tested the hypotheses using panel date analysis by fixed effects model. The estimated results are shown in FIGURE 2. Regarding our hypotheses H1, involving the negative effect of rival entry on the focal retailer’s store-network, is not supported. However, the interaction of “the dominance of the focal retailer” with “rival entry” and the interaction of “rival entry in multiple regions” with “rival entry” are significant, although their signs of coefficients differ depending on whether the rival is seven-eleven or family-mart. Thus, hypotheses H2 and H3b are supported in part. Implication and Future Research Our findings have several important implications. First, our empirical results suggest that the effect of rival entry on a focal retailer’s store-network depends on (1) rival’s position in CVS industry, (2) the focal retailer’s dominance, and (3) rival’s multiple entry. Second, when a rival has a superior position than the focal retailer, dominance advantage of the focal retailer increases the negative effect of rival entry, which is contrary to our expectation. This implies that enhancement of the density of own store-network will cause cannibalization, so each store of a focal retailer may be highly vulnerable to entry by a rival who has superior competitive position (i.e. Seven-Eleven). Finally, multiple entry by a rival in superior position reinforces the negative effect of their entry on expansion of the focal retailer’s store-network in the regional market. Though this study was a rare attempt to explain regional competition among Japanese CVS chain retailers empirically, it did not include the prefectures that Seven-Eleven and Family-Mart were the first entrants. This may limit generality of the empirical results, hence it is valuable to take this problem into consideration in future research.
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Kazuhiro Nishikawa,Satoshi Ogata,Toshihiro Shoyama,Wan-Sick Cho,Tae-Sick Yoon,Masakiyo Tsunoda,Migaku Takahashi 한국자기학회 2002 Journal of Magnetics Vol.7 No.3
Three fabrication techniques for forming thin barrier layer with uniform thickness and large barrier height in magnetic tunnel junction (MTJ) are discussed. First, the effect of immiscible element addition to Cu layer, a high conducting layer generally placed under the MTJ, is investigated in order to reduce the surface roughness of the bottom ferromagnetic layer, on which the barrier is formed. The Ag addition to the Cu layer successfully realizes the smooth surface of the ferromagnetic layer because of the suppression of the grain growth of Cu. Second, a new plasma source, characterized as low electron energy of 1 eV and high density of 10¹² ㎝-³, is introduced to the Al oxidation process in MTJ fabrication in order to reduce damages to the barrier layer by the ion-bombardment. The magnetotransport properties of the MTJs are investigated as a function of the annealing temperature. As a peculiar feature, the monotonous decrease of resistance area product (RA) is observed with increasing the annealing temperature. The decrease of the RA is due to the decrease of the effective barrier width. Third, the influence of the mixed inert gas species for plasma oxidization process of metallic Al layer on the tunnel magnetoresistance (TMR) was investigated. By the use of Kr-O₂ plasma for Al oxidation process, a 58.8% of MR ratio was obtained at room temperature after annealing the junction at 300℃, while the achieved TMR ratio of the MTJ fabricated with usual Ar-O₂ plasma remained 48.4%. A faster oxidization rate of the Al layer by using Kr-O₂ plasma is a possible cause to prevent the over oxidization of Al layer and to realize a large magnetoresistance.
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