Joze Duhovnik - Academia.edu (original) (raw)
Papers by Joze Duhovnik
Structural synthesis of conceptual technical systems is a result of transformation from the funct... more Structural synthesis of conceptual technical systems is a result of transformation from the functional domain into the structural domain. To enable semi-automated synthesis of conceptual technical systems on the basis of physical laws basic schemata have been introduced. Basic schemata are complementary to physical laws and consist of four elementary structural elements (point, line, surface and volume). In the presented paper, we discuss the properties of structural elements for synthesis of conceptual technical systems and how they are used to support variant design. Engineers from different engineering domains were asked to generate conceptual technical systems on the basis of automatically generated chains of physical laws and on the basis of the complementary chains of basic schemata. It was shown that engineers with different educational background and experiences will generate different conceptual structures, although concepts operate on the basis of the same physical laws
Technical innovations in the area of manufacturing logistics are being introduced partially and t... more Technical innovations in the area of manufacturing logistics are being introduced partially and thus not exploiting their full potential. In order to optimise the efficiency of turning manufacturing processes, the process has been analysed and fundamentally re-engineered. All data from production (operations, quantities, date, time duration of operations, etc.) are now located in ERP system. It provided the necessary condition for the establishment of a robust dynamic planning model. An update was required for the whole lifecycle of products and means of work. The paper presents the information support and an algorithm for a dynamic planning model, based on a genetic algorithm. Continuous data capturing and planning in real time are a breakthrough in the management of the process. Presented are a generalised dynamic planning model and a case example from the production of turned parts, which take account of the singularities of a real environment. Production capacities have to be linked up with the supply chain and customers. The presented dynamic planning model can be adapted to various types of production.
Technical innovations in the area of manufacturing logistics are being introduced partially and t... more Technical innovations in the area of manufacturing logistics are being introduced partially and thus not exploiting their full potential. In order to optimise the efficiency of turning manufacturing processes, the process has been analysed and fundamentally re-engineered. All data from production (operations, quantities, date, time duration of operations, etc.) are now located in ERP system. It provided the necessary condition for the establishment of a robust dynamic planning model. An update was required for the whole lifecycle of products and means of work. The paper presents the information support and an algorithm for a dynamic planning model, based on a genetic algorithm. Continuous data capturing and planning in real time are a breakthrough in the management of the process. Presented are a generalised dynamic planning model and a case example from the production of turned parts, which take account of the singularities of a real environment. Production capacities have to be li...
Ds 32 Proceedings of Design 2004 the 8th International Design Conference Dubrovnik Croatia, 2004
Engineering Computations, 2006
PurposeLayout optimization of structures aims to find the optimal topology and member sizes in an... more PurposeLayout optimization of structures aims to find the optimal topology and member sizes in an integrated manner. For this purpose, the most successful attempts have addressed the outstanding features of the genetic algorithms.Design/methodology/approachThis paper utilizes a direct index coding (DIC) in a way that the optimization algorithm can simultaneously integrate topology and size in a minimal length chromosome in order to seek the true optimum in an efficient and reasonable manner. Proper genetic operators are adopted for this special kind of encoding together with some modifications in the topological mutation aiming to improve the convergence of the algorithm.FindingsThe present DIC, has the following features: enforcing one‐to‐one correspondence between discrete genotype space and the problems' phenotype space; avoiding any out‐of‐bound parameter addressing and limiting the GA search only to necessary genotypes; reduction in the size of genotype search space to incr...
Emotional Engineering Volume 4, 2016
Nowadays, product design for the global market has to meet the needs and demands of more than a s... more Nowadays, product design for the global market has to meet the needs and demands of more than a single group of users. Besides the required functionality, the emotional value of the product also plays an important role in user satisfaction. One of the aspects that an interdisciplinary design team should consider while developing a new product is the users’ cross-cultural differences in emotional responses toward product elements. The objective of this study was to use the adjusted Kansei engineering methodology, named the Kansei cross-culture (KCUL) model, in order to discover the differences or similarities in emotional responses toward shapes and colors of diverse groups of participants. This study demonstrates this methodology on two groups of students, one from Central Europe and the other from South Asia (India). We presumed that the observed participants will have different associations toward certain shape and color samples, as well as that they will differ in the intensity of responses. The data were collected through Semantic differential questionnaires and the five-level Likert scale. The survey results were then analyzed using the Factor analysis, the Independent t-test, and the Linear mixed models.
Abstract:- In presented paper a design model is developed which is used to find an optimal design... more Abstract:- In presented paper a design model is developed which is used to find an optimal design space in order to improve precision and accuracy of reversed 3D models. Significant parameters and their mutual effects in scanning process are recognized with the help of Design of Experiments (DOE) principles, and in second step recognized significant parameters are also optimized using the RSM (Response Surface Methodology). Back propagated neural network is used for prediction of response factors whose input variables are not possible to set during experimentation due to the nature of the scan device. With neural network (NN) predicted response-design data, the Analysis of Variance (ANOVA) test was performed. On a basis of significant parameters the analytical model is established, which enables prediction and optimization of critical scan parameters, according to the prescribed standard deviation (abberation) of analysed 3D CAD models. After getting knowledge about the relationship...
At NIKO d.d. company, a producer of binding mechanisms, the improvements are usually a trial-and-... more At NIKO d.d. company, a producer of binding mechanisms, the improvements are usually a trial-and-error process. For this reason, our company has taken a more systematic approach. The prescriptive model of searching for changes has been used. The use of the model on the mechanism M75 has shown that the model is also suitable for companies with limited R&D human resources. It also has a positive effect on the creativeness of the process of searching for changes. Its deficiency lies in the fact that decomposition does not keep the relations between the parts. Searching and assessing the changes proved the main problem. The proposed changes should contribute to a better competitiveness of the product on the market.
Strojniški vestnik, 2010
Within the knowledge-based economy several institutions are involved in product innovation proces... more Within the knowledge-based economy several institutions are involved in product innovation processes. Literature study has shown that the most researched and cited are the industry-university-government relations, presented in the Triple Helix model of institutional relations within new product development (NPD). Based on a case study of the Academic Virtual Enterprise, we have put the sole input of these institutions in NPD into question. We have tested and supported the claim that the user and the society are equal partners in the product innovation process. We have put forward the Fourfold Helix model that features a new formation of institutional relations where special focus is placed on the involvement of the user and the society in NPD.
In the paper the design process is analysed and a new model of the design process which is useful... more In the paper the design process is analysed and a new model of the design process which is usefull in CAD is explained. At working a construction with the computer we have to consider the function and form. The function defines the capacity of the construction and the usefulness dependet on the connection machine-nature. With the form we define the possibility of manufacturing and usefulness dependet on the connection man-machine, For a successful working of the function and the form we use geometrical modelling and word processing, The interaction between man-computer can the most easily be done with sketching (form) and speech (words). In the paper the data input with sketching is explained using keyboard instead of speech. In the appendix an example of working the construction by our method is presented.
Launching of new product on the market is necessary for company growth and business development. ... more Launching of new product on the market is necessary for company growth and business development. Only 10% of launched new products are successful. How can we increase successfulness of new products? We have developed a special method for identifying opportunities for new products. A new product can mean improvements of existing products, radical innovations or services. The method is suitable for small as well as big companies. We defined social, economic, technological and legislative factors which help us to recognize opportunities while taking into account company characteristics. The method presents more systematic approach to opportunity identification process.
Design Golden Loop (DGL) can be used in the Design Process (DP) by the Development and Design Pro... more Design Golden Loop (DGL) can be used in the Design Process (DP) by the Development and Design Process (D&DP). General paradigm of the DGL is based on the iterative steps in the design process. Iterative process has been known since 1983 as a model. The model presented iterative work between a general task determination, depending on the problem. In the development process we used the generative model, which presents the basic function, values and parameters used in the design process as a framework of a task. Specification and function request, evaluation with iterative comparison between the function and form in general, experts assessment with product improvement and decision of results used is the essens of iterative design process. In the paper shown the detail steps using by the real project. The DGL was not generated at the end of the pump search but we start with the searching when the real problem has been recognized. The results are useful and the methods give opportunity a...
Creation building can come on most significant level of efficiency if in the entire procedure eng... more Creation building can come on most significant level of efficiency if in the entire procedure engaged with absolute starting point time Research-improvement and structuring stage. One of the realized techniques is brilliant circle, which was available right off the bat on TU Delft on 2002. Later was created in LECAD on the University of Ljubljana. Research facility LECAD was thought about completely participation with the business and oddities of the item. In paper will be available first circle where the difficult acknowledgment was performed. The subsequent circle is significant for group combination and clearing the issues by any means. On the third circle, we discover the capacity ability concurring the solicitation. At last, in the brilliant circle we proposed the detail plan with significant level of detail looking. With that brilliant circle the item, become obvious in great arranged for creation and particularly for complete creation building. With some model as e-drive bike...
In this work we present basic principle of treecode (TC) metho d, its advantages and drawbacks in... more In this work we present basic principle of treecode (TC) metho d, its advantages and drawbacks in its applications for laboratory and fusion plasmas . Particular task done in this work is to create a small but efficient PIC simulation program in or der to obtain more data than currently possible with other such programs available today, a nd to compare results of our program with results obtained with other methods and packages. The p rogram is intended to be used in plasma-wall investigations of laboratory, technology ori ented and fusion plasmas.
The world is in the middle of the globalization process that, among other things, forces companie... more The world is in the middle of the globalization process that, among other things, forces companies into acquisitions and mergers, and strategic alliances. This leads to the merging of geographically, organizationally and culturally heterogeneous human resources, including product developers. Market and organizational changes, the integrated product development process, and available information and communication technologies (ICT), present a number of challenges for future product developers. An appropriate response to these challenges is to create a solid basis for strategies to combat stronger competition, since existing educational programmes have provided this only to a small extent. European-Global Product Realization (E-GPR) course is one of possible educational programmes; the paper presents some experiences based on running the course.
Strojniski Vestnik-journal of Mechanical Engineering, 2010
This paper discusses the influence of surface topology on the accuracy of laser triangulation sca... more This paper discusses the influence of surface topology on the accuracy of laser triangulation scanning results. Scanning distance and scanning angle of impact laser beam was found to be the most crucial interaction between the surface topology and scanning process. Therefore, we focused these two parameters while other parameters like microstructure, colour of surface, optical settings remained fixed. Despite of random nature of freeform surfaces, the measurements were systematic, according to the principles of the design of experiment (DOE) adjusting angle and distance in the whole scanning range. Based on the results of this research and prior estimation of surface complexity, an implication or working area range prediction, as well as the determination of optimal set of influence parameters inside this particular working area can be done.
Structural synthesis of conceptual technical systems is a result of transformation from the funct... more Structural synthesis of conceptual technical systems is a result of transformation from the functional domain into the structural domain. To enable semi-automated synthesis of conceptual technical systems on the basis of physical laws basic schemata have been introduced. Basic schemata are complementary to physical laws and consist of four elementary structural elements (point, line, surface and volume). In the presented paper, we discuss the properties of structural elements for synthesis of conceptual technical systems and how they are used to support variant design. Engineers from different engineering domains were asked to generate conceptual technical systems on the basis of automatically generated chains of physical laws and on the basis of the complementary chains of basic schemata. It was shown that engineers with different educational background and experiences will generate different conceptual structures, although concepts operate on the basis of the same physical laws
Technical innovations in the area of manufacturing logistics are being introduced partially and t... more Technical innovations in the area of manufacturing logistics are being introduced partially and thus not exploiting their full potential. In order to optimise the efficiency of turning manufacturing processes, the process has been analysed and fundamentally re-engineered. All data from production (operations, quantities, date, time duration of operations, etc.) are now located in ERP system. It provided the necessary condition for the establishment of a robust dynamic planning model. An update was required for the whole lifecycle of products and means of work. The paper presents the information support and an algorithm for a dynamic planning model, based on a genetic algorithm. Continuous data capturing and planning in real time are a breakthrough in the management of the process. Presented are a generalised dynamic planning model and a case example from the production of turned parts, which take account of the singularities of a real environment. Production capacities have to be linked up with the supply chain and customers. The presented dynamic planning model can be adapted to various types of production.
Technical innovations in the area of manufacturing logistics are being introduced partially and t... more Technical innovations in the area of manufacturing logistics are being introduced partially and thus not exploiting their full potential. In order to optimise the efficiency of turning manufacturing processes, the process has been analysed and fundamentally re-engineered. All data from production (operations, quantities, date, time duration of operations, etc.) are now located in ERP system. It provided the necessary condition for the establishment of a robust dynamic planning model. An update was required for the whole lifecycle of products and means of work. The paper presents the information support and an algorithm for a dynamic planning model, based on a genetic algorithm. Continuous data capturing and planning in real time are a breakthrough in the management of the process. Presented are a generalised dynamic planning model and a case example from the production of turned parts, which take account of the singularities of a real environment. Production capacities have to be li...
Ds 32 Proceedings of Design 2004 the 8th International Design Conference Dubrovnik Croatia, 2004
Engineering Computations, 2006
PurposeLayout optimization of structures aims to find the optimal topology and member sizes in an... more PurposeLayout optimization of structures aims to find the optimal topology and member sizes in an integrated manner. For this purpose, the most successful attempts have addressed the outstanding features of the genetic algorithms.Design/methodology/approachThis paper utilizes a direct index coding (DIC) in a way that the optimization algorithm can simultaneously integrate topology and size in a minimal length chromosome in order to seek the true optimum in an efficient and reasonable manner. Proper genetic operators are adopted for this special kind of encoding together with some modifications in the topological mutation aiming to improve the convergence of the algorithm.FindingsThe present DIC, has the following features: enforcing one‐to‐one correspondence between discrete genotype space and the problems' phenotype space; avoiding any out‐of‐bound parameter addressing and limiting the GA search only to necessary genotypes; reduction in the size of genotype search space to incr...
Emotional Engineering Volume 4, 2016
Nowadays, product design for the global market has to meet the needs and demands of more than a s... more Nowadays, product design for the global market has to meet the needs and demands of more than a single group of users. Besides the required functionality, the emotional value of the product also plays an important role in user satisfaction. One of the aspects that an interdisciplinary design team should consider while developing a new product is the users’ cross-cultural differences in emotional responses toward product elements. The objective of this study was to use the adjusted Kansei engineering methodology, named the Kansei cross-culture (KCUL) model, in order to discover the differences or similarities in emotional responses toward shapes and colors of diverse groups of participants. This study demonstrates this methodology on two groups of students, one from Central Europe and the other from South Asia (India). We presumed that the observed participants will have different associations toward certain shape and color samples, as well as that they will differ in the intensity of responses. The data were collected through Semantic differential questionnaires and the five-level Likert scale. The survey results were then analyzed using the Factor analysis, the Independent t-test, and the Linear mixed models.
Abstract:- In presented paper a design model is developed which is used to find an optimal design... more Abstract:- In presented paper a design model is developed which is used to find an optimal design space in order to improve precision and accuracy of reversed 3D models. Significant parameters and their mutual effects in scanning process are recognized with the help of Design of Experiments (DOE) principles, and in second step recognized significant parameters are also optimized using the RSM (Response Surface Methodology). Back propagated neural network is used for prediction of response factors whose input variables are not possible to set during experimentation due to the nature of the scan device. With neural network (NN) predicted response-design data, the Analysis of Variance (ANOVA) test was performed. On a basis of significant parameters the analytical model is established, which enables prediction and optimization of critical scan parameters, according to the prescribed standard deviation (abberation) of analysed 3D CAD models. After getting knowledge about the relationship...
At NIKO d.d. company, a producer of binding mechanisms, the improvements are usually a trial-and-... more At NIKO d.d. company, a producer of binding mechanisms, the improvements are usually a trial-and-error process. For this reason, our company has taken a more systematic approach. The prescriptive model of searching for changes has been used. The use of the model on the mechanism M75 has shown that the model is also suitable for companies with limited R&D human resources. It also has a positive effect on the creativeness of the process of searching for changes. Its deficiency lies in the fact that decomposition does not keep the relations between the parts. Searching and assessing the changes proved the main problem. The proposed changes should contribute to a better competitiveness of the product on the market.
Strojniški vestnik, 2010
Within the knowledge-based economy several institutions are involved in product innovation proces... more Within the knowledge-based economy several institutions are involved in product innovation processes. Literature study has shown that the most researched and cited are the industry-university-government relations, presented in the Triple Helix model of institutional relations within new product development (NPD). Based on a case study of the Academic Virtual Enterprise, we have put the sole input of these institutions in NPD into question. We have tested and supported the claim that the user and the society are equal partners in the product innovation process. We have put forward the Fourfold Helix model that features a new formation of institutional relations where special focus is placed on the involvement of the user and the society in NPD.
In the paper the design process is analysed and a new model of the design process which is useful... more In the paper the design process is analysed and a new model of the design process which is usefull in CAD is explained. At working a construction with the computer we have to consider the function and form. The function defines the capacity of the construction and the usefulness dependet on the connection machine-nature. With the form we define the possibility of manufacturing and usefulness dependet on the connection man-machine, For a successful working of the function and the form we use geometrical modelling and word processing, The interaction between man-computer can the most easily be done with sketching (form) and speech (words). In the paper the data input with sketching is explained using keyboard instead of speech. In the appendix an example of working the construction by our method is presented.
Launching of new product on the market is necessary for company growth and business development. ... more Launching of new product on the market is necessary for company growth and business development. Only 10% of launched new products are successful. How can we increase successfulness of new products? We have developed a special method for identifying opportunities for new products. A new product can mean improvements of existing products, radical innovations or services. The method is suitable for small as well as big companies. We defined social, economic, technological and legislative factors which help us to recognize opportunities while taking into account company characteristics. The method presents more systematic approach to opportunity identification process.
Design Golden Loop (DGL) can be used in the Design Process (DP) by the Development and Design Pro... more Design Golden Loop (DGL) can be used in the Design Process (DP) by the Development and Design Process (D&DP). General paradigm of the DGL is based on the iterative steps in the design process. Iterative process has been known since 1983 as a model. The model presented iterative work between a general task determination, depending on the problem. In the development process we used the generative model, which presents the basic function, values and parameters used in the design process as a framework of a task. Specification and function request, evaluation with iterative comparison between the function and form in general, experts assessment with product improvement and decision of results used is the essens of iterative design process. In the paper shown the detail steps using by the real project. The DGL was not generated at the end of the pump search but we start with the searching when the real problem has been recognized. The results are useful and the methods give opportunity a...
Creation building can come on most significant level of efficiency if in the entire procedure eng... more Creation building can come on most significant level of efficiency if in the entire procedure engaged with absolute starting point time Research-improvement and structuring stage. One of the realized techniques is brilliant circle, which was available right off the bat on TU Delft on 2002. Later was created in LECAD on the University of Ljubljana. Research facility LECAD was thought about completely participation with the business and oddities of the item. In paper will be available first circle where the difficult acknowledgment was performed. The subsequent circle is significant for group combination and clearing the issues by any means. On the third circle, we discover the capacity ability concurring the solicitation. At last, in the brilliant circle we proposed the detail plan with significant level of detail looking. With that brilliant circle the item, become obvious in great arranged for creation and particularly for complete creation building. With some model as e-drive bike...
In this work we present basic principle of treecode (TC) metho d, its advantages and drawbacks in... more In this work we present basic principle of treecode (TC) metho d, its advantages and drawbacks in its applications for laboratory and fusion plasmas . Particular task done in this work is to create a small but efficient PIC simulation program in or der to obtain more data than currently possible with other such programs available today, a nd to compare results of our program with results obtained with other methods and packages. The p rogram is intended to be used in plasma-wall investigations of laboratory, technology ori ented and fusion plasmas.
The world is in the middle of the globalization process that, among other things, forces companie... more The world is in the middle of the globalization process that, among other things, forces companies into acquisitions and mergers, and strategic alliances. This leads to the merging of geographically, organizationally and culturally heterogeneous human resources, including product developers. Market and organizational changes, the integrated product development process, and available information and communication technologies (ICT), present a number of challenges for future product developers. An appropriate response to these challenges is to create a solid basis for strategies to combat stronger competition, since existing educational programmes have provided this only to a small extent. European-Global Product Realization (E-GPR) course is one of possible educational programmes; the paper presents some experiences based on running the course.
Strojniski Vestnik-journal of Mechanical Engineering, 2010
This paper discusses the influence of surface topology on the accuracy of laser triangulation sca... more This paper discusses the influence of surface topology on the accuracy of laser triangulation scanning results. Scanning distance and scanning angle of impact laser beam was found to be the most crucial interaction between the surface topology and scanning process. Therefore, we focused these two parameters while other parameters like microstructure, colour of surface, optical settings remained fixed. Despite of random nature of freeform surfaces, the measurements were systematic, according to the principles of the design of experiment (DOE) adjusting angle and distance in the whole scanning range. Based on the results of this research and prior estimation of surface complexity, an implication or working area range prediction, as well as the determination of optimal set of influence parameters inside this particular working area can be done.