Pub Date : 2015-11-05DOI: 10.1109/KBEI.2015.7436172
Omid Izadpanahi, A. Meidani, Ghazale Jian Abed, M. Passandideh-Fard
The present study investigates the movement of water drop within a microchannel under electrowetting phenomenon. Electrowetting, by applying boundary (line) stress and the macroscopic variation in the contact angle of the surface, operates according to an electric field in order to manipulate small volumes of liquids. Applied electrostatic field makes the conducting drop to move in the direction of the field. Electrowetting phenomenon simulation has been done by application of OpenFoam software in Linux operating system and interFoam solver, by using the method of the volume of fluid (VOF). Numerical modeling has been compared with experimental results has been confirmed, and then has been investigated through three dimensional modeling of the movement of fluid drop in microchannels under electrowetting phenomenon with channel's different heights. An increase in microchannel height at fixed volume of water drop causes the velocity of drop to increase. The movement of the drops under the electrowetting phenomenon stimulation in climbing up the inclined plane in microchannels has been investigated through variable angle toward the horizon. Increasing microchannels angle with the horizon surface decrease the drop ascending velocity.
{"title":"Numerical investigation of water drop movement within a microchannel under electrowetting phenomenon","authors":"Omid Izadpanahi, A. Meidani, Ghazale Jian Abed, M. Passandideh-Fard","doi":"10.1109/KBEI.2015.7436172","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436172","url":null,"abstract":"The present study investigates the movement of water drop within a microchannel under electrowetting phenomenon. Electrowetting, by applying boundary (line) stress and the macroscopic variation in the contact angle of the surface, operates according to an electric field in order to manipulate small volumes of liquids. Applied electrostatic field makes the conducting drop to move in the direction of the field. Electrowetting phenomenon simulation has been done by application of OpenFoam software in Linux operating system and interFoam solver, by using the method of the volume of fluid (VOF). Numerical modeling has been compared with experimental results has been confirmed, and then has been investigated through three dimensional modeling of the movement of fluid drop in microchannels under electrowetting phenomenon with channel's different heights. An increase in microchannel height at fixed volume of water drop causes the velocity of drop to increase. The movement of the drops under the electrowetting phenomenon stimulation in climbing up the inclined plane in microchannels has been investigated through variable angle toward the horizon. Increasing microchannels angle with the horizon surface decrease the drop ascending velocity.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131810544","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436117
Neda Hajibabaei, M. Firoozbakht
The current study presents an image segmentation algorithm based on modified FCM. One of the main image characteristics is the correlation between neighboring pixels. In other words, in the image segmentation, neighboring pixels are likely to belong to the same cluster. In conventional FCM, cluster assignment is only based on pixels attributes and the way they are distributed, and at the same time pixels spatial distribution and neighboring correlation aren't often taken into consideration. In other words, pixels are perceived by conventional FCM as scattered and an array is used rather than an image matrix. Other drawbacks of conventional FCM algorithm include sensitivity to small changes in intensity in homogeneous regions as well as sensitivity to noise. To put it another way, homogeneous regions in image are segmented due to shadow or small changes in intensity. We attempted to address the problems arising out of conventional FCM by investigating spatial relationship between pixels and using a multiplicative field. The results reveal the accurate function of the proposed algorithm.
{"title":"Image segmentation using a modified fuzzy C-means clustering","authors":"Neda Hajibabaei, M. Firoozbakht","doi":"10.1109/KBEI.2015.7436117","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436117","url":null,"abstract":"The current study presents an image segmentation algorithm based on modified FCM. One of the main image characteristics is the correlation between neighboring pixels. In other words, in the image segmentation, neighboring pixels are likely to belong to the same cluster. In conventional FCM, cluster assignment is only based on pixels attributes and the way they are distributed, and at the same time pixels spatial distribution and neighboring correlation aren't often taken into consideration. In other words, pixels are perceived by conventional FCM as scattered and an array is used rather than an image matrix. Other drawbacks of conventional FCM algorithm include sensitivity to small changes in intensity in homogeneous regions as well as sensitivity to noise. To put it another way, homogeneous regions in image are segmented due to shadow or small changes in intensity. We attempted to address the problems arising out of conventional FCM by investigating spatial relationship between pixels and using a multiplicative field. The results reveal the accurate function of the proposed algorithm.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121116729","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436169
Banafsheh Yeganegi, N. Ranjbar, J. Sadati
This paper presents an observer based control scheme to control chaos in a class of nonlinear systems in the presence of external disturbances. In order to control chaos, a sliding mode control is chosen as the control technique. The controller requires a measured signal and its time derivative which is built with the aid of super-twisting differentiator. This technique is of a sensor-less strategy to eliminate the need for extra sensors. The technique is shown to reduce complexity and the measurement noise. The effectiveness of the proposed control scheme, consisting of a sliding mode for control and super-twisting algorithm for differentiation is illustrated through simulation.
{"title":"Sensor-less control of nonlinear systems in Brunovsky form using super-twisting differentiator","authors":"Banafsheh Yeganegi, N. Ranjbar, J. Sadati","doi":"10.1109/KBEI.2015.7436169","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436169","url":null,"abstract":"This paper presents an observer based control scheme to control chaos in a class of nonlinear systems in the presence of external disturbances. In order to control chaos, a sliding mode control is chosen as the control technique. The controller requires a measured signal and its time derivative which is built with the aid of super-twisting differentiator. This technique is of a sensor-less strategy to eliminate the need for extra sensors. The technique is shown to reduce complexity and the measurement noise. The effectiveness of the proposed control scheme, consisting of a sliding mode for control and super-twisting algorithm for differentiation is illustrated through simulation.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"21 99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127137934","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436057
A. Asadi
In this paper, from the perspective of Benford's law the inter-arrival time of UDP in packet and flow levels, is investigated. Benford's law is an empirical law that describes the distribution of first digits in series of numbers in natural phenomena. We claim that Benford's law describes the inter-arrival time of UDP packets and flows in normal traffic of networks. As a result, any significant anomaly in UDP packets and flows including deliberate intrusions, unwanted errors or in general, network failures, can be identified by checking the first digit distribution inter-arrival time of UDP packets and flows. In a recent work, the relationship between Weibull distribution and Benford's law was studied. In another work, the compliance of the inter-arrival time of UDP packets and flows from Weibull distribution is presented. In this paper, we have proposed a method for using Benford's law for detecting anomalies in inter-arrival time of UDP packets and flows. The proposed method can detect the UDP Flood attack with high detection rate.
{"title":"An approach for detecting anomalies by assessing the inter-arrival time of UDP packets and flows using Benford's law","authors":"A. Asadi","doi":"10.1109/KBEI.2015.7436057","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436057","url":null,"abstract":"In this paper, from the perspective of Benford's law the inter-arrival time of UDP in packet and flow levels, is investigated. Benford's law is an empirical law that describes the distribution of first digits in series of numbers in natural phenomena. We claim that Benford's law describes the inter-arrival time of UDP packets and flows in normal traffic of networks. As a result, any significant anomaly in UDP packets and flows including deliberate intrusions, unwanted errors or in general, network failures, can be identified by checking the first digit distribution inter-arrival time of UDP packets and flows. In a recent work, the relationship between Weibull distribution and Benford's law was studied. In another work, the compliance of the inter-arrival time of UDP packets and flows from Weibull distribution is presented. In this paper, we have proposed a method for using Benford's law for detecting anomalies in inter-arrival time of UDP packets and flows. The proposed method can detect the UDP Flood attack with high detection rate.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123282383","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436181
Hasan Naderi Rad, S. S. Sani, Mona Naderi Rad
In this study, a system for monitoring the structural health of bridge deck and predicting various possible damages to this section was designed based on measuring the temperature and humidity with the use of wireless sensor networks, and then it was implemented and investigated. A scaled model of a conventional medium sized bridge (length of 50 meters, height of 10 meters, and with 2 piers) was examined for the purpose of this study. This method includes installing two sensor nodes with the ability of measuring temperature and humidity on both side of the bridge deck. The data collected by the system including temperature and humidity values are received by a LABVIEW-based software to be analyzed and stored in a database. Proposed SHM monitoring system is equipped by a novel method of using data mining techniques on the database of climatic conditions of past few years related to the location of the bridge to predict the occurrence and severity of future damages. In addition, this system has several alarm levels which are based on analysis of bridge conditions with fuzzy inference method, so it can issue proactive and precise warnings and alarms in terms of place of occurrence and severity of possible damages in the bridge deck to ensure total productive (TPM) and proactive maintenance. Very low costs, increased efficiency of the bridge service, and reduced maintenance costs makes this SHM system a practical and applicable system. The data and results related to all mentioned subjects were thoroughly discussed and the accuracy and reliability of the SHM systems were evaluated. The results show that this system is qualified to be used as a SHM system in medium to large bridges.
{"title":"A new inexpensive system for SHM Of bridge decks using wireless sensor networks based on measurements of temperature and humidity","authors":"Hasan Naderi Rad, S. S. Sani, Mona Naderi Rad","doi":"10.1109/KBEI.2015.7436181","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436181","url":null,"abstract":"In this study, a system for monitoring the structural health of bridge deck and predicting various possible damages to this section was designed based on measuring the temperature and humidity with the use of wireless sensor networks, and then it was implemented and investigated. A scaled model of a conventional medium sized bridge (length of 50 meters, height of 10 meters, and with 2 piers) was examined for the purpose of this study. This method includes installing two sensor nodes with the ability of measuring temperature and humidity on both side of the bridge deck. The data collected by the system including temperature and humidity values are received by a LABVIEW-based software to be analyzed and stored in a database. Proposed SHM monitoring system is equipped by a novel method of using data mining techniques on the database of climatic conditions of past few years related to the location of the bridge to predict the occurrence and severity of future damages. In addition, this system has several alarm levels which are based on analysis of bridge conditions with fuzzy inference method, so it can issue proactive and precise warnings and alarms in terms of place of occurrence and severity of possible damages in the bridge deck to ensure total productive (TPM) and proactive maintenance. Very low costs, increased efficiency of the bridge service, and reduced maintenance costs makes this SHM system a practical and applicable system. The data and results related to all mentioned subjects were thoroughly discussed and the accuracy and reliability of the SHM systems were evaluated. The results show that this system is qualified to be used as a SHM system in medium to large bridges.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115098298","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436027
H. Amin, S. Ozoguz, R. Kopru, B. Yarman
A wideband and flat gain distributed power amplifier using a GaN high electron mobility (HEMT) transistor has been designed. The frequency range covers 700 MHz to 4.5 GHz. The small signal gain has the average value of 10 dB. A reactive distributed shunt feedback structure is introduced and implemented by means of microstrip coupled lines. Also, fully distributed input and output impedance matching networks are implemented. The design and simulations are accomplished by advanced design system tool (ADS). The design has undergone large signal, small signal and electromagnetic analysis (EM-simulation). At VDS = 28 V and IDS = 340 mA. Down to the output power back-off of 5 dB at 4.5 GHz, power performance obtained with PAE higher than 35% where the maximum output power is 40.4 dBm.
{"title":"Distributed wideband power amplifier using reactive coupled line feedback structure","authors":"H. Amin, S. Ozoguz, R. Kopru, B. Yarman","doi":"10.1109/KBEI.2015.7436027","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436027","url":null,"abstract":"A wideband and flat gain distributed power amplifier using a GaN high electron mobility (HEMT) transistor has been designed. The frequency range covers 700 MHz to 4.5 GHz. The small signal gain has the average value of 10 dB. A reactive distributed shunt feedback structure is introduced and implemented by means of microstrip coupled lines. Also, fully distributed input and output impedance matching networks are implemented. The design and simulations are accomplished by advanced design system tool (ADS). The design has undergone large signal, small signal and electromagnetic analysis (EM-simulation). At VDS = 28 V and IDS = 340 mA. Down to the output power back-off of 5 dB at 4.5 GHz, power performance obtained with PAE higher than 35% where the maximum output power is 40.4 dBm.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122529193","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436115
Rassoul Hajizadeh, A. Aghagolzadeh, M. Ezoji
In this study, a new nonlinear manifold learning technique based on the Locally Linear Embedding (LLE) is proposed. In this method, a new modified LLE based on the neighborhood conception is proposed. Then, by this new definition of LLE, true neighbors of each data are selected to construct the reconstruction weights. By this new definition of neighborhood of each data, structure of data manifold is preserved in low dimensionality. In this study, after using the proposed MLLE, linear discrimination analysis (LDA) technique is applied on Persian handwritten character. Finally, recognition rate has been calculated by K nearest neighbor (KNN) classifier. Experimental results demonstrate the superiority of the proposed method.
{"title":"Manifold based Persian digit recognition using the modified locally linear embedding and linear discriminative analysis","authors":"Rassoul Hajizadeh, A. Aghagolzadeh, M. Ezoji","doi":"10.1109/KBEI.2015.7436115","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436115","url":null,"abstract":"In this study, a new nonlinear manifold learning technique based on the Locally Linear Embedding (LLE) is proposed. In this method, a new modified LLE based on the neighborhood conception is proposed. Then, by this new definition of LLE, true neighbors of each data are selected to construct the reconstruction weights. By this new definition of neighborhood of each data, structure of data manifold is preserved in low dimensionality. In this study, after using the proposed MLLE, linear discrimination analysis (LDA) technique is applied on Persian handwritten character. Finally, recognition rate has been calculated by K nearest neighbor (KNN) classifier. Experimental results demonstrate the superiority of the proposed method.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116855513","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436196
S. Shariati, Abouzarjomehri, M. Hossein Ahmadzadegan
Cloud computing is one of the most popular techniques in distributed computing which will increase scalability and flexibility in computer processing due to its ability to minimize the cost of time calculations. Cloud computing provides resources and shared services through the internet. Services will be delivered through the data center. Cloud computing provides an interesting business proposal for information technology industry, which without any additional investment, customers are able to do heavy processing by devices such as a mobile phone that has the resources including the web browser to run. On the other hand, cloud computing has been subject to many security issues. When a client delivers his data to a cloud provider for saving, there is the possibility of data loss. From the perspective of customers, cloud computing security concerns are still in place, in particular issues related to data security and privacy protection. In this paper, the challenges and security issues in cloud computing are investigated from two perspectives being data security and privacy protection.
{"title":"Challenges and security issues in cloud computing from two perspectives: Data security and privacy protection","authors":"S. Shariati, Abouzarjomehri, M. Hossein Ahmadzadegan","doi":"10.1109/KBEI.2015.7436196","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436196","url":null,"abstract":"Cloud computing is one of the most popular techniques in distributed computing which will increase scalability and flexibility in computer processing due to its ability to minimize the cost of time calculations. Cloud computing provides resources and shared services through the internet. Services will be delivered through the data center. Cloud computing provides an interesting business proposal for information technology industry, which without any additional investment, customers are able to do heavy processing by devices such as a mobile phone that has the resources including the web browser to run. On the other hand, cloud computing has been subject to many security issues. When a client delivers his data to a cloud provider for saving, there is the possibility of data loss. From the perspective of customers, cloud computing security concerns are still in place, in particular issues related to data security and privacy protection. In this paper, the challenges and security issues in cloud computing are investigated from two perspectives being data security and privacy protection.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128323138","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436111
Mojtaba Charchian, B. Zakeri, H. Miar-Naimi
This paper presents a method to design a wide-band noise figure (NF) low noise amplifier (LNA) for 3.5-4.5 GHz. The quality factor method has been used to achieve better bandwidth of noise figure. To design low noise amplifier circuit in Radio Frequency (RF), trade-off between noise figure, gain, stability and input return loss should be considered. Two configurations of amplifiers are presented. The first configuration is a single-stage amplifier with input and output matching networks according to noise and gain consideration respectively. It has the noise figure of 1.062db and the gain of 10.288db. The second configuration is a cascade amplifier that, in addition to the first one, an inter-stage matching network is used for it. It has the noise figure of 1.123db and the gain of 20.317db. Agilent Advanced Design System (ADS) EM/circuit co-simulation has been used to perform simulation.
{"title":"Wideband noise figure low noise amplifier design for 3.5–4.5 GHz","authors":"Mojtaba Charchian, B. Zakeri, H. Miar-Naimi","doi":"10.1109/KBEI.2015.7436111","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436111","url":null,"abstract":"This paper presents a method to design a wide-band noise figure (NF) low noise amplifier (LNA) for 3.5-4.5 GHz. The quality factor method has been used to achieve better bandwidth of noise figure. To design low noise amplifier circuit in Radio Frequency (RF), trade-off between noise figure, gain, stability and input return loss should be considered. Two configurations of amplifiers are presented. The first configuration is a single-stage amplifier with input and output matching networks according to noise and gain consideration respectively. It has the noise figure of 1.062db and the gain of 10.288db. The second configuration is a cascade amplifier that, in addition to the first one, an inter-stage matching network is used for it. It has the noise figure of 1.123db and the gain of 20.317db. Agilent Advanced Design System (ADS) EM/circuit co-simulation has been used to perform simulation.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124750000","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436215
H. Kangarlou, P. Esmaili
Tin dioxide and metallic impurity (Cu, Fe) doped stannic oxide Nano layers were produced by chemical bath deposition method on glass substrates. The effects of doping on optoelectronic properties of stannic oxide Nano layers were studied. Optical Reflectance measured in the wavelength range of 220-2500 nm by spectrophotometer. Other optical properties and optical band gaps were calculated using Kramers-Kronig relations on reflectivity curves. Electronic properties were calculated by full potential linearized augmented plane wave (FP-LAPW) method, within density functional theory (DFT). In this approach, the generalized gradient approximation (GGA) in the form of the LSDA functional was used for the exchange-correlation potential calculations. Band gap structures and density of states were calculated. Doping impurity changes optical properties of Tin dioxide layers. Metallic impurities, especially copper, decreases the band gap energy and increases conductivity of layers. Value of band gap calculated by DFT method for SnO2 compound obtained 1.2 eV. All results are in good agreement with each other.
{"title":"Effect of doping on optoelectronic properties of Tin dioxide layers produced by chemical deposition","authors":"H. Kangarlou, P. Esmaili","doi":"10.1109/KBEI.2015.7436215","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436215","url":null,"abstract":"Tin dioxide and metallic impurity (Cu, Fe) doped stannic oxide Nano layers were produced by chemical bath deposition method on glass substrates. The effects of doping on optoelectronic properties of stannic oxide Nano layers were studied. Optical Reflectance measured in the wavelength range of 220-2500 nm by spectrophotometer. Other optical properties and optical band gaps were calculated using Kramers-Kronig relations on reflectivity curves. Electronic properties were calculated by full potential linearized augmented plane wave (FP-LAPW) method, within density functional theory (DFT). In this approach, the generalized gradient approximation (GGA) in the form of the LSDA functional was used for the exchange-correlation potential calculations. Band gap structures and density of states were calculated. Doping impurity changes optical properties of Tin dioxide layers. Metallic impurities, especially copper, decreases the band gap energy and increases conductivity of layers. Value of band gap calculated by DFT method for SnO2 compound obtained 1.2 eV. All results are in good agreement with each other.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130374795","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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