Pub Date : 2014-09-11DOI: 10.1109/ICIT.2014.6895021
Ojo Adejare Akintunde, Ilugbiyin Olalekan Ayodeji
This study focused on the level of penetration of Internet usage among undergraduate students in Nigeria using Obafemi Awolowo University as a case study. Result showed that about 92% of undergraduate students have embraced the Internet and are using it consistently. The online mean time is 3.5 hrs/week while on the average, undergraduate experience of Internet usage is about 4 years. We found also that the students use the Internet mostly for e-mail, information search and online chatting; all of these were found to have significant impact on their academics and social life. Further analysis revealed that gender attitude is also an important issue; male students appear to use the Internet more than their female counterparts; just as science based students use it more than the non-science based students. The paper therefore recommends appropriate policies for all higher schools of learning in Nigeria to facilitate further diffusion and use of the Internet.
{"title":"Assessment of internet usage amongst Nigerian students — A case study approach","authors":"Ojo Adejare Akintunde, Ilugbiyin Olalekan Ayodeji","doi":"10.1109/ICIT.2014.6895021","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6895021","url":null,"abstract":"This study focused on the level of penetration of Internet usage among undergraduate students in Nigeria using Obafemi Awolowo University as a case study. Result showed that about 92% of undergraduate students have embraced the Internet and are using it consistently. The online mean time is 3.5 hrs/week while on the average, undergraduate experience of Internet usage is about 4 years. We found also that the students use the Internet mostly for e-mail, information search and online chatting; all of these were found to have significant impact on their academics and social life. Further analysis revealed that gender attitude is also an important issue; male students appear to use the Internet more than their female counterparts; just as science based students use it more than the non-science based students. The paper therefore recommends appropriate policies for all higher schools of learning in Nigeria to facilitate further diffusion and use of the Internet.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129016935","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894898
Ashok Kumar, Vasav Gautam, P. Sensarma
This paper presents a transformer-less, single stage, doubly grounded, buck-boost single phase inverter. The inverter is derived from SEPIC converter by replacing its output side inductor with a coupled inductor. Stand-alone operation of the inverter is discussed with resistive and inductive load. Simulation results are given to validate the operational ability of proposed inverter.
{"title":"A SEPIC derived single stage buck-boost inverter for photovoltaic applications","authors":"Ashok Kumar, Vasav Gautam, P. Sensarma","doi":"10.1109/ICIT.2014.6894898","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894898","url":null,"abstract":"This paper presents a transformer-less, single stage, doubly grounded, buck-boost single phase inverter. The inverter is derived from SEPIC converter by replacing its output side inductor with a coupled inductor. Stand-alone operation of the inverter is discussed with resistive and inductive load. Simulation results are given to validate the operational ability of proposed inverter.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"3 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131958147","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894910
T. Kangilaski
Planning an Virtual Organization in a reasonable time to make proposal by Focal Player to the potential customer is quite challenging. There is a need to understand existing capabilities and their availabilities in the Partner Network and if there are determined some constraints, the external companies should be called in. The current article analyzes and proposes an approach how the Focal Player in Partner Network could use maturity based models to perform business process analyses which needed to be implemented to satisfy the potential customers' need.
{"title":"Planning Virtual Organization in Partner Network","authors":"T. Kangilaski","doi":"10.1109/ICIT.2014.6894910","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894910","url":null,"abstract":"Planning an Virtual Organization in a reasonable time to make proposal by Focal Player to the potential customer is quite challenging. There is a need to understand existing capabilities and their availabilities in the Partner Network and if there are determined some constraints, the external companies should be called in. The current article analyzes and proposes an approach how the Focal Player in Partner Network could use maturity based models to perform business process analyses which needed to be implemented to satisfy the potential customers' need.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134265619","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6895004
W. Doorsamy, W. Cronje
Predictive maintenance philosophy is fast becoming a norm in industry, where prognostics and diagnostics in electrical machines are essential. The efficiency and reliability of the technique being utilized depend profoundly on measurement accuracy and analysis. Frequency analysis is commonly used in the interpretation of measurements for condition monitoring purposes. This paper presents a study of techniques in frequency analysis in condition monitoring of electrical rotating machines. Different performance characteristics of various spectral estimation techniques are compared for application in incipient fault diagnosis. The study includes an evaluation of a Bayesian spectral estimation method together with more conventional practices such as the standard periodogram, Welch and Music methods. The investigation uses an example of shaft voltage based condition monitoring in machines for a specific case of eccentricity. Results of the study indicate that the Bayesian method, although unconventional in fault diagnostics, is exceptionally robust and exhibits qualities well-suited to the application.
{"title":"A study on Bayesian spectrum estimation based diagnostics in electrical rotating machines","authors":"W. Doorsamy, W. Cronje","doi":"10.1109/ICIT.2014.6895004","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6895004","url":null,"abstract":"Predictive maintenance philosophy is fast becoming a norm in industry, where prognostics and diagnostics in electrical machines are essential. The efficiency and reliability of the technique being utilized depend profoundly on measurement accuracy and analysis. Frequency analysis is commonly used in the interpretation of measurements for condition monitoring purposes. This paper presents a study of techniques in frequency analysis in condition monitoring of electrical rotating machines. Different performance characteristics of various spectral estimation techniques are compared for application in incipient fault diagnosis. The study includes an evaluation of a Bayesian spectral estimation method together with more conventional practices such as the standard periodogram, Welch and Music methods. The investigation uses an example of shaft voltage based condition monitoring in machines for a specific case of eccentricity. Results of the study indicate that the Bayesian method, although unconventional in fault diagnostics, is exceptionally robust and exhibits qualities well-suited to the application.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134454392","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894931
M. Ojaghi, N. Yazdandoost
This paper proposes dynamic modeling and simulation of squirrel cage induction motors under oil whirl fault within their sleeve bearings. Previous experimental results are used for defining an appropriate air gap function under the fault. This function is used in the winding function approach for the modeling and simulation purpose. Analytic approach and simulation results show presence of the same frequency components on the stator line current of the faulty motor. Some of these frequency components can be appropriate indices for diagnosing the fault.
{"title":"Winding function approach to simulate induction motors under sleeve bearing fault","authors":"M. Ojaghi, N. Yazdandoost","doi":"10.1109/ICIT.2014.6894931","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894931","url":null,"abstract":"This paper proposes dynamic modeling and simulation of squirrel cage induction motors under oil whirl fault within their sleeve bearings. Previous experimental results are used for defining an appropriate air gap function under the fault. This function is used in the winding function approach for the modeling and simulation purpose. Analytic approach and simulation results show presence of the same frequency components on the stator line current of the faulty motor. Some of these frequency components can be appropriate indices for diagnosing the fault.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123867560","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894923
Y. Chung, C. Lee, Mihye Jang
This study introduces over 400 km/h maglev vehicle system based on electromagnetic suspension (EMS) model. Such a maglev system is composed of high temperature superconducting (HTS) magnet, normal conducting magnet and propulsion system. The hybrid electromagnet (EM) consumes little power to keep large suspension gap. The propulsion system realizes to propel the vehicle along the guide-way and assist in braking action. Especially, as the essential point of EMS-based maglev model is to keep the stable suspension force in the high speed operation, the levitation and propulsion forces should be analyzed in order to equilibrate the suspension gap. In this paper, theoretical properties of the levitation force based on electromagnetic analysis are described, as we have been constructed a proto-type electromagnetic suspension (EMS) based maglev vehicle system. Based on the simulation results, we obtained the design parameters for variation suspension gap under high speed propulsion condition.
{"title":"Electromagnetic analysis for multiple hybrid HTS electromagnets interfaced with LSM propulsion system in EMS maglev model","authors":"Y. Chung, C. Lee, Mihye Jang","doi":"10.1109/ICIT.2014.6894923","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894923","url":null,"abstract":"This study introduces over 400 km/h maglev vehicle system based on electromagnetic suspension (EMS) model. Such a maglev system is composed of high temperature superconducting (HTS) magnet, normal conducting magnet and propulsion system. The hybrid electromagnet (EM) consumes little power to keep large suspension gap. The propulsion system realizes to propel the vehicle along the guide-way and assist in braking action. Especially, as the essential point of EMS-based maglev model is to keep the stable suspension force in the high speed operation, the levitation and propulsion forces should be analyzed in order to equilibrate the suspension gap. In this paper, theoretical properties of the levitation force based on electromagnetic analysis are described, as we have been constructed a proto-type electromagnetic suspension (EMS) based maglev vehicle system. Based on the simulation results, we obtained the design parameters for variation suspension gap under high speed propulsion condition.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936851","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894977
Nurul Dayana Salim, Dafizal Derawi, S. Abdullah, S. Mazlan, H. Zamzuri
The aim of this paper is to propose an optimum linear control algorithm that is able to stabilize the attitude of a hexarotor micro aerial vehicle (MAV) in indoor environment. The work will then compare it with the classical control PID (proportional-integral-derivative) and optimal control LQR (linear quadratic regulator) techniques. The proposed attitude controller is based on an outer-inner loop structure PID plus LQR (PID+LQR) control method where the controller combines the positive features of each sub-controller (PID and LQR). The key contribution of this work is the proposed attitude controller can improve robustness and transient response thus leads to faster response in indoor flying environment. The attitude tracking errors are proven to be ultimately bounded with specified boundaries. Simulation results on the hexarotor demonstrate the effectives of the proposed attitude controller.
{"title":"PID plus LQR attitude control for hexarotor MAV in indoor environments","authors":"Nurul Dayana Salim, Dafizal Derawi, S. Abdullah, S. Mazlan, H. Zamzuri","doi":"10.1109/ICIT.2014.6894977","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894977","url":null,"abstract":"The aim of this paper is to propose an optimum linear control algorithm that is able to stabilize the attitude of a hexarotor micro aerial vehicle (MAV) in indoor environment. The work will then compare it with the classical control PID (proportional-integral-derivative) and optimal control LQR (linear quadratic regulator) techniques. The proposed attitude controller is based on an outer-inner loop structure PID plus LQR (PID+LQR) control method where the controller combines the positive features of each sub-controller (PID and LQR). The key contribution of this work is the proposed attitude controller can improve robustness and transient response thus leads to faster response in indoor flying environment. The attitude tracking errors are proven to be ultimately bounded with specified boundaries. Simulation results on the hexarotor demonstrate the effectives of the proposed attitude controller.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128835490","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894981
M. Neuburger, G. Schmidt, N. Neuberger
A new power train topology for vehicles with electrical machines is introduced, including a photovoltaic energy source, to realize a range extender based vehicle. A new direct energy conversion scheme is applied, being combinable with conventional setups like hybrids, electrical vehicles or already established range extenders and independent of the type of electrical machine. Using this power train configuration, a standard inverter is used in parallel for energy conversion in terms of propulsion demands and charging aspects. For the first time photovoltaic energy and electrical stored energy is converted at the same time with one standard power train inverter offering high efficiency and increased reliability.
{"title":"A new topology for a photovoltaic based range extender","authors":"M. Neuburger, G. Schmidt, N. Neuberger","doi":"10.1109/ICIT.2014.6894981","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894981","url":null,"abstract":"A new power train topology for vehicles with electrical machines is introduced, including a photovoltaic energy source, to realize a range extender based vehicle. A new direct energy conversion scheme is applied, being combinable with conventional setups like hybrids, electrical vehicles or already established range extenders and independent of the type of electrical machine. Using this power train configuration, a standard inverter is used in parallel for energy conversion in terms of propulsion demands and charging aspects. For the first time photovoltaic energy and electrical stored energy is converted at the same time with one standard power train inverter offering high efficiency and increased reliability.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117091283","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894939
Khalid I. Saad, G. Mirzaeva
A new fault diagnosis scheme based on the monitoring of main air gap flux of squirrel cage induction motors is proposed. Most of the existing flux monitoring techniques are based on the leakage or stray flux measurement outside of the motor. A few methods, however, use the main air gap flux as the fault signature, where search coils are used to monitor the derivative of the flux, which eventually introduces noise in the signal. Moreover, the diagnosis methods are mainly based on detecting a fault, whereas very little initiative has been taken to locate a fault precisely. To address these problems, a sophisticated yet robust condition monitoring and fault diagnosis method is needed. To this aim, we propose to monitor the main air gap flux using Hall Effect Flux Sensors (HEFS) at all the stator slots of an induction motor, which can be used to address the stator and rotor slot effects not only through frequency analysis of the magnetic flux, but also by magnitude and phase shift comparison of sensors located at different geometric positions around the stator. We have successfully detected the stator turn-to-turn fault at a very incipient stage and detected the location of the fault precisely. Promising results have been obtained through simulation in the case of broken rotor bar faults as well.
{"title":"Fault diagnostics of induction motors based on internal flux measurement","authors":"Khalid I. Saad, G. Mirzaeva","doi":"10.1109/ICIT.2014.6894939","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894939","url":null,"abstract":"A new fault diagnosis scheme based on the monitoring of main air gap flux of squirrel cage induction motors is proposed. Most of the existing flux monitoring techniques are based on the leakage or stray flux measurement outside of the motor. A few methods, however, use the main air gap flux as the fault signature, where search coils are used to monitor the derivative of the flux, which eventually introduces noise in the signal. Moreover, the diagnosis methods are mainly based on detecting a fault, whereas very little initiative has been taken to locate a fault precisely. To address these problems, a sophisticated yet robust condition monitoring and fault diagnosis method is needed. To this aim, we propose to monitor the main air gap flux using Hall Effect Flux Sensors (HEFS) at all the stator slots of an induction motor, which can be used to address the stator and rotor slot effects not only through frequency analysis of the magnetic flux, but also by magnitude and phase shift comparison of sensors located at different geometric positions around the stator. We have successfully detected the stator turn-to-turn fault at a very incipient stage and detected the location of the fault precisely. Promising results have been obtained through simulation in the case of broken rotor bar faults as well.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115577435","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 : 2014-09-11DOI: 10.1109/ICIT.2014.6894862
Seong-Mi Park, Jae-Ha Ko, Sung‐Jun Park
This study proposes a multi-exciter method DC/DC converter topology in order to remove voltage unbalance from batteries. The proposed topology is characterized by a design in which all DC/DC convertor outputs the connected to modules converge into a single transformer. This paper attempts to analyze the dynamic properties of the proposed circuit using a Programmable Synthesizer Interface Module(PSIM), which is useful for power electronics analysis, while also attempting to demonstrate the validity of the proposed circuit through an experiment.
{"title":"The battery balancing circuit using multi-exciter method","authors":"Seong-Mi Park, Jae-Ha Ko, Sung‐Jun Park","doi":"10.1109/ICIT.2014.6894862","DOIUrl":"https://doi.org/10.1109/ICIT.2014.6894862","url":null,"abstract":"This study proposes a multi-exciter method DC/DC converter topology in order to remove voltage unbalance from batteries. The proposed topology is characterized by a design in which all DC/DC convertor outputs the connected to modules converge into a single transformer. This paper attempts to analyze the dynamic properties of the proposed circuit using a Programmable Synthesizer Interface Module(PSIM), which is useful for power electronics analysis, while also attempting to demonstrate the validity of the proposed circuit through an experiment.","PeriodicalId":240337,"journal":{"name":"2014 IEEE International Conference on Industrial Technology (ICIT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114812236","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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