Kazuya Oizumi

System-Level Design Tools Utilizing OPM and Modelica

This paper presents a methodology and tools to synthesize and assess different System-Level Designs. It utilizes the descriptive modeling language Object Process Methodology (OPM) to hierarchically describe the functionality of the System of Interest which is mapped by way of various intermediary models to an architecture in the Modelica numerical modeling language. The resulting Modelica architecture model is subsequently used as a framework for the rapid creation of alternative System of Interest designs by the variation of components. To enable consistent assessment of the alternatives, Assessment Scenarios are created based on the functionality identified by OPM decomposition. By defining a hierarchy of Modelica models with the Assessment Scenarios at the top, all the System of Interest alternative models can be composed into the Assessment Scenarios and the resulting models simulated. With a combined score for each alternative across all the Assessment Scenarios being computed by way of Multi Objective Decision Analysis (MODA). This paper demonstrates the approach with an actual student solar powered autonomous boat development project.

Supporting System for Tour Lineup Design based on Tour Service Modeling

This paper proposes a computer aided design method of package tours that meets various tourists’ favors while controlling cost. Tour service is modeled as network that comprises activity, place, capability and enabler. Design process of a tour lineup takes three steps. First, the network is redesigned by morphing an improvement. All possible sequences of activities (tour candidates) are extracted from the network. The extracted tour candidates are combined as a lineup. After feasibility of the lineup is checked, it is evaluated by the viewpoints of tourists and providers. The proposed method is validated through the case of Tokyo day tours.

Implementing Value-Driven Design in Modelica for a Racing Solar Boat

Research has shown that current design approaches, such as requirement-based design or cost as independent variable (CAIV), may fundamentally yield suboptimal designs. In response to the need for better systems, new design techniques that are based on optimization and decision-making have been proposed. In this paper, we show how Modelica can be used to implement and operationalize value-driven design (VDD) in concept selection. Modelica’s object-oriented strengths are employed to model design alternatives and its capability to execute Monte Carlo simulation enables the introduction of uncertainty in models and assessment. The proposed approach has been applied to the conceptual design of an unmanned, autonomous solar powered boat, which is aimed at racing in a student competition. Value has been defined as a function of the probability to win the said race, which expands usual examples of value functions to nonmonetary ones. This paper describes the approach as well as the benefits, limitations, and obstacles encountered during its implementation.

Service Data Model in Design Support System for Sightseeing Tours

This paper proposes a data structure definition of the tourism resources that will help tour designers determine tourists’ fundamental needs based on their requests and design their tours more efficiently. This study analyzes tour services and divides the information useful in proposing services, based on tourists’ requests, into three types: geographical, time, and meaning information. This paper employs those three types of information to define two indexes for use in proposing services that match customer requests.

INVENTIVE PRODUCT DESIGN FOCUSING ON PHYSICAL CAUSAL RELATIONSHIPS CAUSING TRADE-OFFS BETWEEN FUNCTIONS

Development of fascinating products has always been aspired by product designers. Trade-offs are one important aspects to consider improving a product functionality. When significant trade-off is relieved by a sort of invention, functionality of a product reaches new frontier. This paper proposes a method to support ideation of inventive solution based on analysis of trade-offs and physical contradictions in a product, which are mapped to contradiction matrix of TRIZ. Validity of the proposed method was confirmed through a demonstration with Continuous Variable Transmission.

A Model Framework for Determining Dynamic Architecture Goals in a Systems-of-Systems

This paper presents results from a prototype modeling methodology, part of a PhD project intending to create an integrated model framework relating societal modeling techniques to system-of-systems (SoS) architecture models and design. This framework uses matrix-based and system dynamics (SD) models to relate product system functions to associated systems and to societal dynamics step-by-step, in order to synthesize justified design priorities for a new product platform. In this manner, function importance weights or goal prioritization for a new product are obtained from societal models and scenarios. These weights are highly dependent on outside (SoS) functions, vary in time, and depend on the risk attitude of the project. In future work, this framework will be applied to modularization and architecture design and evaluated by a case study in the aerospace industry, where a space system manufacturer is considering designing new satellite product lines.

Design Support System for Sightseeing Tours

The Japanese government has initiatives on promoting tourism. To fulfill various needs of tourists from many countries, sightseeing tours need to have large variations. This demands productivity improvement. Among others, determination of a sequence among tourist attractions is challenging due to its contextual feature. This paper proposes a design support method for service sequences. Network-structured models are employed to visualize the relationships among tourist attractions in three aspects: place, time, and content. Tour designs are evaluated using a simulation that incorporates multiple stakeholders. The usefulness of the proposed method is discussed via a case study with a prototype system.

Finding Breakthrough Points in Platformed Product Family Design

In product development, a design parameter, which designers can change directly, often has an adverse effect on several function metrics, which are indices that describe the product performance. This phenomenon is called a “tradeoff.” Traditionally, tradeoffs are considered for a single product. However, in recent years, there have been tradeoffs between several products because of communal design parameters in platform-based product family design. This problem makes it difficult to determine the point at which a technological innovation is profitable.In this paper, the point where designers make a technological innovation is defined as a breakthrough. A method is suggested to find the effective breakthrough point for a product family. A model was developed that shows the relations between design parameters and function metrics from a quality function deployment (QFD) to comprehensively estimate the effectiveness of a technological innovation. As an example application, a prototype system was developed and applied to searching a solar boat product family for breakthrough points. The results showed that the proposed method effectively supports the decision-making of product designers.Copyright

Design of Packaged Tours upon Semantic Service Model

Service design, particularly in packaged tours, needs a descriptive model to innovate the design process by shifting from personal implicit knowledge-based style to tool-assisted data-based knowledge-intensive style. This study proposes a descriptive model for packaged tours with semantics using hierarchical semantics to organize the attributes and the unified space in order to simplify the definition of feasibility. Based on the proposed model, a method for planning a tour is contemplated. Through application to the current Tokyo day tours, the applicability of the proposed model and method was verified using a prototype system for planning a tour.