Overview in PDF format - Tallinna TehnikaÃ¼likool

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overall concept of the system includes sectoral, enterprise and technological levels(Fig. 4.1).Figure 4.1 Information flow in virtual database solution for planning resource-sharingproduction in a technological resources networkThe sectoral level involves a general description of technological features ofindustrial sector enterprises. The knowledge base connects also manufacturingenterprises, consultancy firms, educational organizations and universities in acertain field to handle local resources for larger subcontract orders and productionvolumes.The enterprise level includes a specification and a detailed description oftechnological possibilities of an enterprise, increasing the export opportunities ofSMEs through technological networking. This level includes data about availabilityof current resources.Technological possibilities involve firstly the specifications of technologicalprocesses, e.g. turning, milling, drilling, welding, etc. followed by a selection ofcorresponding subclasses. When selecting a specific subclass, one has to specifysome technological constraints, e.g. the bar and chuck capacity, maximal length ofwork piece, etc.Some general questions of creating cooperative production network can be listedas: is manufacturing of a certain product possible within the network, what is theexpected production time, what are feasible logistic solutions and reroutingpossibilities in case of emergency (equipment failure)? Those questions representthe user point of view to all of three cooperation levels described and should beformalized as queries to the database.44
As assumptions to solve the queries described we need:1. A description of the technological process to be implemented in terms ofmachining operations and their sequencing constraints.2. Enterprises, their technological capabilities in terms of machining operations,performance and quality characteristics of services.3. Locations of enterprises and inter-enterprise logistics.The incremental approach proposed for solving the production planningproblems consists of three phases:1. Deciding whether the technological process is feasible (implementable)concerning given constraints, i.e., showing the existence of some solution.2. Reduction of the solution space by removing inappropriate firms and services.The selection criteria are the cost, deadline, trust, and location of serviceproviders.3. Finding the time/cost (sub-)optimal solution. It is assumed that the solutiontakes into account also transportation between different locations, e.g. if thequality does not satisfy the standards set.4.2. Shared use of technological resourcesThe enterprise level of the network includes specification and detailed descriptionof technological possibilities of an enterprise, increasing the export opportunities ofSMEs through technological networking. Technological possibilities involvespecification of technological processes, followed by a selection of correspondingsubclasses. When selecting a subclass, the next step is input of adequate data, e.g.bar and chuck capacity, maximal length of work piece.The level of problem solving can be realised by the following options:• an opinion of a current expert system, advising management board/marketingdepartment of an enterprise to evaluate current production potential and needfor updates in technology;• supporting the human agent ability in focussing on core manufacturing to staycompetitive in business;• supporting the outsourcing of non-core business competitive manufacturing –support in creation manufacturing network for those product modules,components or final assembly;• an inquiry through the system, approach to scientific authorities. Universitiesand consultant companies have the key role, acting as authorised bodies,predicting the need for advanced technologies in a forecast of 5 years. Amapped need for investments into new technologies for the next 5 years isvaluable for the community;• data exchange or business-aid network, where participants can describeresources vacant and the supply needed. The resources in current context aredefined as technological capabilities characterised by precise specifications.Technological capabilities are considered as hierarchic associations, whereasdefinition of technological possibility acts as a basis for classifying. In classificationfour levels can be distinguished.45
Page 1 and 2: THESIS ON MECHANICAL AND INSTRUMENT
Page 3 and 4: MASINA- JA APARAADIEHITUS E283
Page 5 and 6: PREFACEThe mankind of the 21 st cen
Page 7 and 8: Paper I............................
Page 9 and 10: XII. Riives, J., Papstel, J., Otto,
Page 11 and 12: 1. INTRODUCTION1.1. BackgroundManuf
Page 13 and 14: database by a query; c. Search of t
Page 15 and 16: Porter’s Diamond Model task an on
Page 17 and 18: Figure 2.1 Use of modelling in prod
Page 19 and 20: However, it should be noticed that
Page 21 and 22: Figure 2.6 Depth of field/magnifica
Page 23 and 24: 2.3. Prediction of machining accura
Page 25 and 26: uFy=ybsinptyOl 1ulFAϕFigure 2.10 C
Page 27 and 28: is2.5. Dynamical model with two deg
Page 29 and 30: According to de Moivre’s formulaw
Page 31 and 32: constant of the lathe. Figure 2.11
Page 33 and 34: Analogically, test results and resu
Page 35 and 36: Figure 3.1 Model checking in an ope
Page 37 and 38: Figure 3.3 A snapshot of Uppaal mod
Page 39 and 40: Figure 3.5 FMS at TUTM9M8M4M1M2M7M5
Page 41 and 42: Turning and milling operations can
Page 43: 4. MODELS FOR MONITORING THE RESOUR
Page 47 and 48: Regarding co-operation networks the
Page 49 and 50: • The system offers dynamic and u
Page 51 and 52: Figure 4.5 Associations in the Inno
Page 53 and 54: An enterprise-centred mapping and a
Page 55 and 56: Better efficiency and transparency
Page 57 and 58: institutions: in enterprises of div
Page 59 and 60: 1. Tehnoloogiaseadme tasemel on loo
Page 61 and 62: REFERENCESAltintas, Y. (2000). Manu
Page 63 and 64: Russo, M.F. (1999). Automating Scie
Page 65 and 66: Paper IIAryassov, G., Otto, T., Gro
Page 67 and 68: Paper IVOtto, T., Papstel, J., Riiv
Page 69 and 70: ELULOOKIRJELDUS (CV)1. IsikuandmedE
Page 71 and 72: CURRICULUM VITAE (CV)1. Personal da
Page 73 and 74: DISSERTATIONS DEFENDED ATTALLINN UN

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