Yuji Naka

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Ontologies reflect our view of what exists and developing ontologies for a given domain requires a common context. This context can be characterized explicitly by means of an upper ontology. Upper ontologies define top-level concepts such as physical objects, activities, mereological and topological relations from which more specific classes and relations(More)
— This paper focuses on an automated batch manufacturing system with material-handling robots (MHRs) and material-processing robots (MPRs). In this robotic manufacturing system, materials transported by the MHRs are processed by the MPRs. These operations cause a bottleneck in the system. Furthermore, the bottleneck induces congestion of the MHRs. In the(More)
— This paper describes a methodology regarding an autonomous cruise control (ACC) of circulating multi-robot which is directly effective for solving the congestion regardless of the presence of a bottleneck. For this purpose, we focus on an external interaction force between the robots. This force is generated with the use of a virtual damper. In this(More)
Intricate modern pharmaceutical business activities strive to achieve lean development for the desired quality level by applying the quality by design (QbD) approach. To engineer suitable information flows for quality development by this approach, a business process model written in the type 0 method of integrated definition language (IDEF0) was created for(More)
The plant maintenance plays an important role to maintain safety in the process industries. A physical state of a process plant changes by deterioration, and its mechanism, speed and location varies with changes in operation and plant structure in the lifecycle. Therefore, to maintain safety through the lifecycle, plant maintenance should be designed to(More)