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Shuhei Yamaguchi,Nobuhiro Yamaguchi,Masaki Mito,Hiroyuki Deguchi,Peter. J. Baker,Stephen. J. Blundell,Michael. J. Pitcher,Dinah. R. Parker,Simon. J. Clarke 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The pressure effects on the 111-type Fe-based superconductor LiFeAs were investigated throughAC susceptibility measurements and X-ray diffraction experiments, and revealed a correlation betweenthe superconducting transition temperature (Tc) and the As-Fe-As bond angle (α) ratherthan the height of As from the Fe layers (hAs). As the pressure was increased, Tc of 17 K at P =0 GPa decreased down to 10 K at P = 5.2 GPa. According to a previous report from an X-raydiffraction experiment, α changes from 101.5˚ at 0 GPa to 97.8˚ at 17 GPa. The obtained changein Tc is consistent with Lee et al.’s plot of Tc as a function of α, and from this result, we concludethat Tc will fall to zero at around α = 98˚.
Collision Avoidance of the Aircraft in the 3 Dimensional Space
Yoshihiro Yamaguchi,Hiroyuki Takano,Takeshi Yamasaki,Isao Yamaguchi 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Recently, domestic and overseas LCC’s (Low Cost Carriers) increase air-traffic in Japan. However, we have narrow domain and many airports. Large training areas of USAF or JSDF also exist in the airspace. In the present circumstances, the flight safety is kept by separating airways from training areas. In the near future, increasing number of flights will make severe situation. In this paper, we try to optimize the evasive courses of aircraft in the narrow airspace. We formulate collision avoidance as a nonlinear programming problem and analyzed numerically. The optimal solution we obtained show courses in narrower spaces than ordinary ones. The assumption of limited airspaces is useful in severe situation like bad weather. Thus, this study might be a good proposal to decide direction for collision avoidance.
A Soundness Verification Tool Based on the SPIN Model Checker for Acyclic Workflow Nets
Shingo YAMAGUCHI,Munenori YAMAGUCHI,Minoru TANAKA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Workflow nets (WF-nets) are Petri nets for modeling workflows, and are utilized to verification and performance evaluation of workflows. A WF-net should have a property, called soundeness, which guarantees a logical correctness of the modeled workflow. If a given WF-net is free choice then its soundness can be verified in polynomial time. Otherwise there is no polynomial time method to verify soundness for general WF-nets. Unfortunately, some workflows cannot be represented as free choice WF-nets. For example, the WF-net representing an inter-organizational workflow may become asymmetric choice. Thus an efficient method is required. In this paper, we propose a tool to verify soundness using the SPIN model checker. We also show efficiency of our tool by comparing it with an existing WF-nets analysis tool, Woflan, on verification time for asymmetric choice WF-nets.
Application of DV-X$\alpha$ Method to ${\gamma}$-2CaO.SiO$_2$
Yamaguchi, Norio,Fujimori, Hirotaka,Ioku, Koji,Goto, Seishi,Nakayasu, Tetsuo The Korean Ceramic Society 2000 The Korean journal of ceramics Vol.6 No.4
In the present study, we attempted to apply DV-X$\alpha$ method to expressing the reactivity of materials. The expression of reactivity was discussed by comparison between ${\gamma}$-C$_2$G having hydraulic activity and ${\gamma}$-C$_2$S not having hydraulic activity at normal conditions. It was found that the model cluster used for calculation can finely reproduce the bulk and surface states using with and without point charge, respectively. The hydration state was also represented by placing OH ̄ on the surface of the cluster. It was calculated that the bond strength of the first layer (as surface) was bigger than that of inner layers (as bulk) for ${\gamma}$-C$_2$S while that of the first layer for ${\gamma}$-C$_2$G was smaller than that of inner layers. Subsequently a model in which OH ̄ is coordinated on Ca at the surface was also calculated. The bond strength with OH ̄ was stronger than that without OH ̄, while for ${\gamma}$-C$_2$G the bond strength with OH ̄ was weaker than that without OH ̄. From these results, it is concluded that the hydraulic activity depends on whether the bond strength for hydrated state becomes weaker than that unhydrated state or not.