Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6608955
Gheorghe Mulec, R. Vasiu, F. Frigura-Iliasa
A mobile ad-hoc network (MANET) is a self-configuring, self-organized, and infrastructureless network of mobile stations, connected by radio links. The challenge to ensure network's operation means to continuously maintain updated information about the network's topology, the characteristics of the radio links and security at all levels. Due to the decentralized nature of the network, this is quite difficult. Distributed coordination and control of MANET has always been a challenge for network designers. This paper presents a proposal for a distributed flow controller, a new approach regarding the network architecture for MANET. From the perspective of the current approaches, the entire network has to be treated as a whole, from the point of view of the management, control and data plane. Our proposed approach, based on the paradigm of SDN (Software Design Network), implies a clear separation between the data plane and the control plane. This separation leads to greater flexibility on the control network, to the possibility of dynamic reconfiguration, and to the improvement of its security.
{"title":"Distributed flow controller for mobile ad-hoc networks","authors":"Gheorghe Mulec, R. Vasiu, F. Frigura-Iliasa","doi":"10.1109/SACI.2013.6608955","DOIUrl":"https://doi.org/10.1109/SACI.2013.6608955","url":null,"abstract":"A mobile ad-hoc network (MANET) is a self-configuring, self-organized, and infrastructureless network of mobile stations, connected by radio links. The challenge to ensure network's operation means to continuously maintain updated information about the network's topology, the characteristics of the radio links and security at all levels. Due to the decentralized nature of the network, this is quite difficult. Distributed coordination and control of MANET has always been a challenge for network designers. This paper presents a proposal for a distributed flow controller, a new approach regarding the network architecture for MANET. From the perspective of the current approaches, the entire network has to be treated as a whole, from the point of view of the management, control and data plane. Our proposed approach, based on the paradigm of SDN (Software Design Network), implies a clear separation between the data plane and the control plane. This separation leads to greater flexibility on the control network, to the possibility of dynamic reconfiguration, and to the improvement of its security.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116914756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6608967
O. Bundau, A. Juratoni, A. Kovács
In this paper we consider the model with time delay from [7], which describe the dynamics of HIV-1 infection. This model presents a Hopf bifurcation. We determine the direction and stability of the bifurcating periodic solutions by applying the normal form theory and the center manifold theorem.
{"title":"Hopf bifurcations in a mathematical model of HIV-1 infection with delay","authors":"O. Bundau, A. Juratoni, A. Kovács","doi":"10.1109/SACI.2013.6608967","DOIUrl":"https://doi.org/10.1109/SACI.2013.6608967","url":null,"abstract":"In this paper we consider the model with time delay from [7], which describe the dynamics of HIV-1 infection. This model presents a Hopf bifurcation. We determine the direction and stability of the bifurcating periodic solutions by applying the normal form theory and the center manifold theorem.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117243754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609005
Petru Dan Cristian, C. Barbulescu, S. Kilyeni, O. Pop, F. Solomonesc
The paper is focusing on transmission network expansion planning (TNEP) problem solved using artificial intelligence techniques. It is divided into two parts. The 1st part is dedicated to the particle swarm optimization (PSO) and genetic algorithm (GA) concepts and mechanisms. The mathematical models and the associated software tool are also presented. Practical considerations are discussed. The 2nd part is focusing on case studies. 13 buses test power system, developed by the authors and IEEE 24 RTS have been used. The research work is going to be used in case of the Romanian power system (over 1000 buses).
{"title":"Artificial intelligence based TNEP. Part 1: Mathematical models","authors":"Petru Dan Cristian, C. Barbulescu, S. Kilyeni, O. Pop, F. Solomonesc","doi":"10.1109/SACI.2013.6609005","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609005","url":null,"abstract":"The paper is focusing on transmission network expansion planning (TNEP) problem solved using artificial intelligence techniques. It is divided into two parts. The 1st part is dedicated to the particle swarm optimization (PSO) and genetic algorithm (GA) concepts and mechanisms. The mathematical models and the associated software tool are also presented. Practical considerations are discussed. The 2nd part is focusing on case studies. 13 buses test power system, developed by the authors and IEEE 24 RTS have been used. The research work is going to be used in case of the Romanian power system (over 1000 buses).","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129869117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609019
Ž. Stojanov, D. Dobrilović, Jelena Stojanov, V. Jevtic
This paper presents an approach to software maintenance effort estimation based on the analysis of software maintenance requests available in issue tracking system in a very small local software company. Over 1900 requests, collected during 19 months in 2010 and 2011, were selected for analysis. The approach takes into account: the frequency of submitted user requests for particular periods of time important for organizing work in the company, the existence of maintenance service agreement for clients, the number of programmers assigned to the task associated to each request, and the number of working hours required for requests solving. The approach calculates correlation and establishes linear regression between frequencies of submitted user requests and the average time required for completing requests. This approach estimates an average number of working hours for processing user requests in periods of time that are important for internal company organization. In the paper are also discussed implications for practice and research, and provided recommendations for adapting this approach to other small software companies.
{"title":"Context dependent maintenance effort estimation: Case study in a small software company","authors":"Ž. Stojanov, D. Dobrilović, Jelena Stojanov, V. Jevtic","doi":"10.1109/SACI.2013.6609019","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609019","url":null,"abstract":"This paper presents an approach to software maintenance effort estimation based on the analysis of software maintenance requests available in issue tracking system in a very small local software company. Over 1900 requests, collected during 19 months in 2010 and 2011, were selected for analysis. The approach takes into account: the frequency of submitted user requests for particular periods of time important for organizing work in the company, the existence of maintenance service agreement for clients, the number of programmers assigned to the task associated to each request, and the number of working hours required for requests solving. The approach calculates correlation and establishes linear regression between frequencies of submitted user requests and the average time required for completing requests. This approach estimates an average number of working hours for processing user requests in periods of time that are important for internal company organization. In the paper are also discussed implications for practice and research, and provided recommendations for adapting this approach to other small software companies.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126934786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609004
A. Bascacov, C. Cernazanu-Glavan, M. Marcu
Nowadays most telecommunication companies use data mining algorithms to analyze and profile their customers based on their communication behaviour. However, similar analysis can be elaborated on call data available to any organization that use any type of communication technologies (e.g. mobile, PBX, VoIP, teleconference). Therefore, in this paper we investigate how data mining algorithms can be used to characterize employers' communication patterns and their influence on business related activities.
{"title":"Using data mining for mobile communication clustering and characterization","authors":"A. Bascacov, C. Cernazanu-Glavan, M. Marcu","doi":"10.1109/SACI.2013.6609004","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609004","url":null,"abstract":"Nowadays most telecommunication companies use data mining algorithms to analyze and profile their customers based on their communication behaviour. However, similar analysis can be elaborated on call data available to any organization that use any type of communication technologies (e.g. mobile, PBX, VoIP, teleconference). Therefore, in this paper we investigate how data mining algorithms can be used to characterize employers' communication patterns and their influence on business related activities.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123819580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6608976
L. Horváth, I. Rudas
This paper introduces selected latest results of a research in situation based product definition. The current representative method of product definition applies situation based control of product feature parameters. In the presented method, application of situation control was improved by placing it from the product feature level to the product behavior level. Because the feature level situation control is a proven key technology in product lifecycle management systems, the new behavior level product definition process controls the process of the feature level product definition. This paper starts with a comparison of the feature and the behavior level product feature definition. Following this, the product request, product behavior, and context structure feature definitions are introduced as main elements of the behavior level product feature definition process. Next, a new context structure and its connection with the feature sequence is exampled and discussed. Finally, application of the proposed method in product lifecycle management systems is outlined.
{"title":"Situation based feature definition on product behavior level","authors":"L. Horváth, I. Rudas","doi":"10.1109/SACI.2013.6608976","DOIUrl":"https://doi.org/10.1109/SACI.2013.6608976","url":null,"abstract":"This paper introduces selected latest results of a research in situation based product definition. The current representative method of product definition applies situation based control of product feature parameters. In the presented method, application of situation control was improved by placing it from the product feature level to the product behavior level. Because the feature level situation control is a proven key technology in product lifecycle management systems, the new behavior level product definition process controls the process of the feature level product definition. This paper starts with a comparison of the feature and the behavior level product feature definition. Following this, the product request, product behavior, and context structure feature definitions are introduced as main elements of the behavior level product feature definition process. Next, a new context structure and its connection with the feature sequence is exampled and discussed. Finally, application of the proposed method in product lifecycle management systems is outlined.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124023632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6608994
P. Butka, J. Pócsová
This paper presents the hybrid approach for visualization of documents sets by the combination of hierarchical clustering method, based on the Growing Hierarchical Self-Organizing Maps algorithm, and Sammon projection. Algorithms based on the self-organizing maps provide robust clustering method suitable for visualization of larger number of documents into the grid-based 2D maps. Sammon projection is nonlinear projection method suitable mostly to visualization of smaller sets of object on (usually 2D) maps based on the projections. Here we have implemented and tested combination of these approaches, where starting set of documents is organized using GHSOM to subsets of similar documents, then for clusters at the end of clustering phase, with smaller number of inputs, Sammon maps are created in order to provide distinction also for documents in these clusters. The method for extraction of characteristic terms based on the information gain analysis was used for description of clusters. Existing library JBOWL was used for implementation of the hybrid algorithm. For testing purposes, the documents in English language were used.
{"title":"Hybrid approach for visualization of documents clusters using GHSOM and sammon projection","authors":"P. Butka, J. Pócsová","doi":"10.1109/SACI.2013.6608994","DOIUrl":"https://doi.org/10.1109/SACI.2013.6608994","url":null,"abstract":"This paper presents the hybrid approach for visualization of documents sets by the combination of hierarchical clustering method, based on the Growing Hierarchical Self-Organizing Maps algorithm, and Sammon projection. Algorithms based on the self-organizing maps provide robust clustering method suitable for visualization of larger number of documents into the grid-based 2D maps. Sammon projection is nonlinear projection method suitable mostly to visualization of smaller sets of object on (usually 2D) maps based on the projections. Here we have implemented and tested combination of these approaches, where starting set of documents is organized using GHSOM to subsets of similar documents, then for clusters at the end of clustering phase, with smaller number of inputs, Sammon maps are created in order to provide distinction also for documents in these clusters. The method for extraction of characteristic terms based on the information gain analysis was used for description of clusters. Existing library JBOWL was used for implementation of the hybrid algorithm. For testing purposes, the documents in English language were used.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125646008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609016
T. Ferenci, Anna Körner, L. Kovács
Technological advancements in diabetes has improved treatment possibilities. The big amount of data obtained from continuous glucose measurement (CGM) devices gave new investigation perspectives of blood glucose variation and other parameters connected to diabetic treatment. The aim of the paper is to investigate the relationship between age, duration of diabetes and sex of the patient with blood glucose levels measured with continuous glucose monitor. Blood glucose level was characterized with the relative time spent in hyper- and hypoglycaemia, central tendency (mean and median) and dispersion (standard deviation and interquartile range). These parameters were measured on n=58 Hungarian children suffering from type 1 diabetes mellitus. The children were poorly controlled, with non-blinded continuous glucose monitor performed to optimize therapy. The univariate association between the aforementioned parameters was investigated with scatterplots (with non-parametric smoothing), linear and Spearman-p correlation coefficients. Multivariate structure was investigated with canonical correlation analysis. It was found that age and duration of diabetes was not significantly associated with any descriptor of blood glucose, but hemoglobin Alc (HbAlc) was positively associated with time spent in hyperglycaemia (but not with hypoglycaemia), with central tendency and with dispersion. The association with dispersion is likely a spurious relationship induced by the central tendency (as a confounder). We observed that the associations of the descriptors with HbAlc are non-monotone, with a break in the positive correlation at 10%. We hypothesize that this is caused by the poor compliance of the patients, i.e. those in worse state increasingly “cheat” during CGM measurements, that is, they pay more attention to their blood glucose levels than what is usually done when no CGM measurement is present; therefore breaking the expected positive, monotone association.
{"title":"Correlation investigations between HbAlc and blood glucose indicators on type 1 diabetic Hungarian children","authors":"T. Ferenci, Anna Körner, L. Kovács","doi":"10.1109/SACI.2013.6609016","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609016","url":null,"abstract":"Technological advancements in diabetes has improved treatment possibilities. The big amount of data obtained from continuous glucose measurement (CGM) devices gave new investigation perspectives of blood glucose variation and other parameters connected to diabetic treatment. The aim of the paper is to investigate the relationship between age, duration of diabetes and sex of the patient with blood glucose levels measured with continuous glucose monitor. Blood glucose level was characterized with the relative time spent in hyper- and hypoglycaemia, central tendency (mean and median) and dispersion (standard deviation and interquartile range). These parameters were measured on n=58 Hungarian children suffering from type 1 diabetes mellitus. The children were poorly controlled, with non-blinded continuous glucose monitor performed to optimize therapy. The univariate association between the aforementioned parameters was investigated with scatterplots (with non-parametric smoothing), linear and Spearman-p correlation coefficients. Multivariate structure was investigated with canonical correlation analysis. It was found that age and duration of diabetes was not significantly associated with any descriptor of blood glucose, but hemoglobin Alc (HbAlc) was positively associated with time spent in hyperglycaemia (but not with hypoglycaemia), with central tendency and with dispersion. The association with dispersion is likely a spurious relationship induced by the central tendency (as a confounder). We observed that the associations of the descriptors with HbAlc are non-monotone, with a break in the positive correlation at 10%. We hypothesize that this is caused by the poor compliance of the patients, i.e. those in worse state increasingly “cheat” during CGM measurements, that is, they pay more attention to their blood glucose levels than what is usually done when no CGM measurement is present; therefore breaking the expected positive, monotone association.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127563614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609008
A. Varga, Ervin Rácz, P. Kádár
U-I characteristics - or electric power - as function of electrical voltage or current - of a solar panel (PV cell or panel) gives important information for developers, engineers and users. From this reason to get U-I plot or characterization of the electric power of a solar panel plays important role at the tests. In this paper a new and easy experimental method for U-I measurement (indirectly measured electric power data) for PV cells will be introduced. The new idea describes a simple, fast and reliable way how to get U-I characteristics - or power properties - of PV cells in a laboratory at a university using basic experimental tools.
{"title":"New experimental method for measuring power characteristics of photovoltaic cells at given light irradiation","authors":"A. Varga, Ervin Rácz, P. Kádár","doi":"10.1109/SACI.2013.6609008","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609008","url":null,"abstract":"U-I characteristics - or electric power - as function of electrical voltage or current - of a solar panel (PV cell or panel) gives important information for developers, engineers and users. From this reason to get U-I plot or characterization of the electric power of a solar panel plays important role at the tests. In this paper a new and easy experimental method for U-I measurement (indirectly measured electric power data) for PV cells will be introduced. The new idea describes a simple, fast and reliable way how to get U-I characteristics - or power properties - of PV cells in a laboratory at a university using basic experimental tools.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131194460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-23DOI: 10.1109/SACI.2013.6609002
E. Guran
The goal of this paper is to reveal through simulation, some of the most effective and feasible power converters, already developed and large scale sold for different green energy sources, using new generation of semiconductors models. These high efficiency topologies are analyzed and discussed here in order to observe the advantages and the disadvantages between them. Also, it's almost mandatory to highlight the improvements of the last generation of SiC semiconductors in order to justify this work.
{"title":"High efficiency power converters for renewable sources of energy","authors":"E. Guran","doi":"10.1109/SACI.2013.6609002","DOIUrl":"https://doi.org/10.1109/SACI.2013.6609002","url":null,"abstract":"The goal of this paper is to reveal through simulation, some of the most effective and feasible power converters, already developed and large scale sold for different green energy sources, using new generation of semiconductors models. These high efficiency topologies are analyzed and discussed here in order to observe the advantages and the disadvantages between them. Also, it's almost mandatory to highlight the improvements of the last generation of SiC semiconductors in order to justify this work.","PeriodicalId":304729,"journal":{"name":"2013 IEEE 8th International Symposium on Applied Computational Intelligence and Informatics (SACI)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114862025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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