International Conference on Civil, Materials and Environmental Sciences (CMES 2015) Function Knowledge Retrieval Based on Functions Knowledge Ontology 1,a 1,b Baoru Su , Yong Liu 1 The College of Information Science and Technology, Qingdao University of Science & Technology, Qingdao 266061, Shandong, China [email protected],[email protected] product principle solution. Abstract—It has been found that design knowledge y Structure knowledge: management is facing many problems in product design. In It is used to describe the structure design of products, it order to improve the design of knowledge sharing and is the refinement and expansion of principle, it is the reusability, the research of function knowledge ontology model structure carrier of theory of solving domain, and it is used has been carried out, which include extended device ontology to describe the shape, size and parameters of the key parts and way of function achievement. Based on the combination of the product. above a refrigerator function ontology and function Mapping of product function and structure is solving decomposition tree has been set up. Function knowledge structure to achieve the function model of product; the retrieval on constructing the function ontology has been functional description of product will be changed to the implemented. A software platform for sharing knowledge description of how to realize these functions with the function decomposition tree has been designed. specific switch, size and the relationship between the parts of components. Keywords- Function knowledge ontology; Manufacturing; The objective of structure realization is Abstraction of Knowledge representation; Function decomposition tree the product structure; and the structure is a set of I. INTRODUCTION components or elements to realize some functions. The mapping relationship between function and structure is Product design is a key stage to determine product many-to-many. A function may be implemented by one or success. However, design knowledge management is facing more features or components, and a feature or element may many problems now. The current situation of design also be performing one or more functions. knowledge expression is as following: y Examples knowledge. y The designer access difficulties. Failure examples of the design, including the scheme y Searching for many documents, the manuals design cases, the product structure knowledge examples, and data occurred in the development technical theory examples and so on. It contains more actual process is time-consuming, and the text factors, and it is foundation of the analog design and case based reasoning design. data about description of concept is Function ontology theory is applied to manufacturing disunity, no semantic expression, it is industry in this paper, function knowledge modeling difficult for computer to understand. method is studied, theory system and construction method y Capture of implicit knowledge is not easy. of function concept ontology are introduced, and the Main reason for the above problems lies in the principle of functional decomposition tree is introduced as understanding insufficiency of the function of generating well. aspect, thus leading to the different views about object This paper draws the function ontology theory presented world in different application fields and the lack of by Mizoguchi lab of the Osaka University in Japan, consistency in the function of knowledge account. In order Ontology is introduced in the home appliance to achieve the knowledge sharing and reuse in different manufacturing industry (refrigerator as an example), so that field, the function knowledge ontology framework is used an accurate, efficient, and intelligent retrieval of function in design. knowledge is implemented. In the design activities, the design knowledge mainly II FUNCTION ONTOLOGY including: y Function knowledge: Functional ontology is proposed based on studying It is used to describe the tasks of products, describe the about ontology, ontology in the application of knowledge functions and sub functions of product. Function description engineering and F-B-S architecture. At present, no one does includes content of function, the implementation parameters further research in this field in China, only a few scholars of function, performance index of function and so on. who have done some research of computer integrated y Technical theory knowledge. manufacturing technology tried to use ontology to solve Describe the principle of product functions and sub some product knowledge representation and information functions. Its expression is more complicated, on one hand; modeling, representatives are as follows: its description can be expressed in text, data and parameters Dr. Li Jian of Beijing University of Aeronautics and explanation, on the other hand, to have graphics support Astronautics [1] put forward the concept of principle © 2015. The authors - Published by Atlantis Press 596 component and functional connectivity through the analysis representation, proposes the conceptual design product of the function of the product element, working principle information modeling method based on ontology. and components of functional surfaces, and set up product Above scholars’ Research only remain in the application principle structure model on this basis using object oriented field; no one has done some research in theory field in method, product design process model based on function China. In abroad, the representative research institution are given as well. about function of Ontology is Mizoguchi Research Dr. Shi Dongyan of Harbin Institute of Technology [2], Laboratory of Osaka University in Japan. They made a deep put forward the concept of design process based on function study of the ontology and F-B-S schema, and successfully through the analysis of the research and application of applied in the manufacturing field, presents a hierarchical conceptual design process theory, studies the application of framework of ontology, knowledge and the function model ontology knowledge in conceptual design process by [4][5] as Figure 1, they studied the function and the referencing ontology. Through the analysis of existing function concept around the center of equipment and put problems in function definition, proposed the function can forward FTs and FBRL[6] in order to realize the function be expressed using the function of semantic; proposed uses behavior mapping. Their research has been successfully the ontology theory to establish the conceptual design applied to engineering, chemical plants, oil refineries, solving process of domain knowledge. Associate professor power plants, washing machine and transistor factory and Wang Youyuan of the Nanjing University of Aeronautics & other fields, design and implementation of knowledge Astronautics [3], realize the share and reuse the design sharing and reuse are achieved. knowledge through the research of conceptual design product information modeling. Analysis of the F-B-S framework of information of product conceptual design Top level ontology Basic principle Equipment body expansion General concept Functional concept ontology Common knowledge Function method of knowledge Attribute tree of The general functional Depending on the context method decomposition tree Specific items Functional decomposition tree Figure 1. Hierarchy framework of Function, Knowledge and Ontology To sum up, the function ontology is based on the decomposition tree contains the design concept and design ontology principle, achieving Standardization of function principle of equipment; and because the function concept knowledge in conceptual design field of products, so as to came from functional concept ontology, so the problem of effectively share the function knowledge, and realize the inconsistent terminology is solved. If the engineer can function knowledge reusability. The function ontology express design principle of equipment using functional defines the function space in the conceptual vocabulary to decomposition tree after the completion of the design, then specifications and limited function space. Function concept it is easy to realize the sharing of design knowledge. In this of application in ontology enables designers to better paper, the design and implementation of ontology based understand the design demand and effective reasoning in retrieval function are achieved, Firstly create the ontology function space. library, and then the Jena inference engine reasoning according to reasoning rules designed, system is expected to III APPLICATION OF FUNCTION ONTOLOGY IN THE FIELD OF achieve a relevant function of the retrieval platform. Users HOME APPLIANCES only need to input the query component function, and get a component with the function, users also can search all the A Design functions of a member, user can also retrieve a method of Through the research and analysis on the function function realization, agent and the entity function through knowledge framework, we found that functional this platform. The system integrated three body mentioned 597 in reference [4][5] into one body, which is conducive to the In this paper, the scientific research as a target, with ontology query. concise, avoid unnecessary redundancy and convenient for extracting the operable principle, borrowing the function B The construction of function ontology ontology framework proposed by Mizoguchi lab, according In a previous study, the ontology frame is built by Hozo to the