The 2010 International Joint Conference on Neural Networks (IJCNN), 2010
This paper presents experimental results related with the behavior of fiber optic microbend senso... more This paper presents experimental results related with the behavior of fiber optic microbend sensors based on different configurations. Different types of deformer sets having different mechanical periodicities, corrugation size and number of deformations cycles have been used to test the validity of the proposed technique. Normalized output intensity of the microbend sensor as a function of applied force is later
2012 International Symposium on Innovations in Intelligent Systems and Applications, 2012
In this paper, novel statistical features namely first moment and second moment were proposed in ... more In this paper, novel statistical features namely first moment and second moment were proposed in the analysis of fiber optic statistical mode sensors to design consistent and sensitive sensors. These features used first time in literature. Experiments were conducted to measure force using statistical mode sensors and analyses were implemented using proposed statistical features. Good results were concluded and it was seen that these statistical features can be used in the design of statistical mode sensors. After that, Artificial Neural Networks (ANNs) with sensor fusion, intelligent sensor architecture was proposed to predict the force values measured by statistical mode sensors. It was seen that using the statistical features with sensor fusion provides better prediction of force values. Multilayer Perceptron (MLP) with different algorithms were used in ANN model. All of them can predict the force values with considerable errors. Statistical mode sensors can be calibrated and fault tolerance of the sensor can be decreased, hence more reliable sensors can be designed.
Abstract—Continuation of an active call is one of the most important quality measurements in the ... more Abstract—Continuation of an active call is one of the most important quality measurements in the cellular systems. Handoff process enables a cellular system to provide such a facility by transferring an active call from one cell to another. Different approaches are proposed and applied in order to achieve better handoff service. The principal parameters used to evaluate handoff techniques are: forced termination probability and call blocking probability. The mechanisms such as guard channels and queuing handoff calls decrease the forced termination probability while increasing the call blocking probability. In this paper we present an overview about the issues related to handoff initiation and decision and discuss about different types of handoff techniques available in the literature. II. HANDOFF INITIATION Handoff initiation is the process of deciding when to request a handoff. Handoff decision is based on received signal strengths (RSS) from current BS and neighboring BSs. In Fig...
Abstract—A new current-mode multifunction filter using minimum number of passive elements is prop... more Abstract—A new current-mode multifunction filter using minimum number of passive elements is proposed. The proposed filter has single-input and four high-impedance outputs. It uses four passive elements (two capacitors and two resistors) and four dual output second generation current conveyors. Each output provides a different filter response, namely, low-pass, high-pass, band-pass and band-reject. The sensitivity analysis is also carried out on both ideal and non-ideal filter configurations. The validity of the proposed filter is verified through PSPICE simulations. Keywords—Active filter, Universal filter, Current conveyors.
— Two-tier cellular networks provide an enhanced use of the networks ' resources for both hi... more — Two-tier cellular networks provide an enhanced use of the networks ' resources for both high and low speed users. However, they cause an increase in the number of handoffs between cells due to having smaller cell sizes in the microcell tier. An effective approach used to prevent the dropping of ongoing calls in a network is delaying these calls in a queue until a channel becomes available. In this paper, we propose a new Markov model for a two-tier cellular network having a FIFO queue in the microcell tier. The performance of the model is then compared with those of a previously proposed model having a queue in the macrocell tier and the effect of having a queue in the microcell or macrocell on both high and low speed users is observed. Keywords—Blocking probability, FIFO queue, Markov chains, Two-tier cellular networks.
Abstract—A new voltage-mode triple-input single-output multifunction filter using only two curren... more Abstract—A new voltage-mode triple-input single-output multifunction filter using only two current conveyors is presented. The proposed filter which possesses three inputs and single-output can generate all biquadratic filtering functions at the output terminal by selecting different input signal combinations. The validity of the proposed filter is verified through PSPICE simulations.
Several Kalman filtering algorithms have been implemented in the past years. One of these algorit... more Several Kalman filtering algorithms have been implemented in the past years. One of these algorithms uses the moving windowing (MW) approach, which is limited with the use of rectangular windows. In this paper, a generalized moving windowing (GMW) algorithm that utilizes arbitrary shaped windows is proposed. The proposed algorithm has been implemented on a known process and compared with existing algorithms. As a result of this comparison, it is shown that GMW algorithm has a superior performance. I.
Ucus Test Enstrumantasyonu (FTI) sensorler ile donatilmis helikopter gibi bir deneysel hava araci... more Ucus Test Enstrumantasyonu (FTI) sensorler ile donatilmis helikopter gibi bir deneysel hava aracinin belirli kosullarda ve manevralarda ucus testlerinin yapilip davranislarinin izlenmesi ve kayit altina alinmasindan sorumludur. Gerinim, yuk, basinc, ivme, titresim ve sicaklik gibi helikopterlerin performans, yapisal dinamik, kullanim, guvenilirlik ve bakim olcumleri icin cesitli test verileri toplanmaktadir. Cesitli sensorlerden toplanan verilerin kapsamli bir sekilde islenmesi ve filtrelenmesi gerekmektedir. Geleneksel olarak bu parametreler elektriksel ve mekanik sensorler kullanilarak elde edilmektedir. Helikopter uzerindeki donen yapilar bu sensorlerin dogrulugunu ve omrunu etkileyebilecek titresimlere neden olmaktadir. Ayrica sicaklik, nem ve korozyonun geleneksel sensorler uzerinde olumsuz etkileri vardir. Bu geleneksel sensorleri baglamak icin cok sayida kablo kullanilmasi, kablolamada karmasikliga, fazladan agirliga ve maliyete neden olmaktadir. Diger taraftan, fiber optik s...
— A new current-mode multifunction filter using minimum number of passive elements is proposed. T... more — A new current-mode multifunction filter using minimum number of passive elements is proposed. The proposed filter has single-input and four high-impedance outputs. It uses four passive elements (two capacitors and two resistors) and four dual output second generation current conveyors. Each output provides a different filter response, namely, low-pass, high-pass, band-pass and band-reject. The sensitivity analysis is carried out on both ideal and non-ideal filter configurations. The validity of the proposed filter is verified through PSPICE simulations and compared with the Sallen-Key filter response. Keywords — Active filter, Universal filter, Current conveyors . I. INTRODUCTIONECENTLY there is a growing interest to current-mode multifunction filters employing current conveyors [1-2], which are accepted to have wider bandwidth and greater linearity compared to voltage mode operational amplifiers [3-4]. Second generation current conveyors (CCIIs) have been found very useful in fil...
Two-tier cellular networks provide an enhanced use of the networks' resources for both high a... more Two-tier cellular networks provide an enhanced use of the networks' resources for both high and low speed users. However, they cause an increase in the number of handoffs between cells due to having smaller cell sizes in the microcell tier. An effective approach used to prevent the dropping of ongoing calls in a network is delaying these calls in a queue until a channel becomes available. In this paper, we propose a new Markov model for a two-tier cellular network having a FIFO queue in the microcell tier. The performance of the model is then compared with those of a previously proposed model having a queue in the macrocell tier and the effect of having a queue in the microcell or macrocell on both high and low speed users is observed. Keywords—Blocking probability, FIFO queue, Markov chains, Two-tier cellular networks.
2011 International Symposium on Innovations in Intelligent Systems and Applications, 2011
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
The 2010 International Joint Conference on Neural Networks (IJCNN), 2010
This paper presents experimental results related with the behavior of fiber optic microbend senso... more This paper presents experimental results related with the behavior of fiber optic microbend sensors based on different configurations. Different types of deformer sets having different mechanical periodicities, corrugation size and number of deformations cycles have been used to test the validity of the proposed technique. Normalized output intensity of the microbend sensor as a function of applied force is later
2012 International Symposium on Innovations in Intelligent Systems and Applications, 2012
In this paper, novel statistical features namely first moment and second moment were proposed in ... more In this paper, novel statistical features namely first moment and second moment were proposed in the analysis of fiber optic statistical mode sensors to design consistent and sensitive sensors. These features used first time in literature. Experiments were conducted to measure force using statistical mode sensors and analyses were implemented using proposed statistical features. Good results were concluded and it was seen that these statistical features can be used in the design of statistical mode sensors. After that, Artificial Neural Networks (ANNs) with sensor fusion, intelligent sensor architecture was proposed to predict the force values measured by statistical mode sensors. It was seen that using the statistical features with sensor fusion provides better prediction of force values. Multilayer Perceptron (MLP) with different algorithms were used in ANN model. All of them can predict the force values with considerable errors. Statistical mode sensors can be calibrated and fault tolerance of the sensor can be decreased, hence more reliable sensors can be designed.
Abstract—Continuation of an active call is one of the most important quality measurements in the ... more Abstract—Continuation of an active call is one of the most important quality measurements in the cellular systems. Handoff process enables a cellular system to provide such a facility by transferring an active call from one cell to another. Different approaches are proposed and applied in order to achieve better handoff service. The principal parameters used to evaluate handoff techniques are: forced termination probability and call blocking probability. The mechanisms such as guard channels and queuing handoff calls decrease the forced termination probability while increasing the call blocking probability. In this paper we present an overview about the issues related to handoff initiation and decision and discuss about different types of handoff techniques available in the literature. II. HANDOFF INITIATION Handoff initiation is the process of deciding when to request a handoff. Handoff decision is based on received signal strengths (RSS) from current BS and neighboring BSs. In Fig...
Abstract—A new current-mode multifunction filter using minimum number of passive elements is prop... more Abstract—A new current-mode multifunction filter using minimum number of passive elements is proposed. The proposed filter has single-input and four high-impedance outputs. It uses four passive elements (two capacitors and two resistors) and four dual output second generation current conveyors. Each output provides a different filter response, namely, low-pass, high-pass, band-pass and band-reject. The sensitivity analysis is also carried out on both ideal and non-ideal filter configurations. The validity of the proposed filter is verified through PSPICE simulations. Keywords—Active filter, Universal filter, Current conveyors.
— Two-tier cellular networks provide an enhanced use of the networks ' resources for both hi... more — Two-tier cellular networks provide an enhanced use of the networks ' resources for both high and low speed users. However, they cause an increase in the number of handoffs between cells due to having smaller cell sizes in the microcell tier. An effective approach used to prevent the dropping of ongoing calls in a network is delaying these calls in a queue until a channel becomes available. In this paper, we propose a new Markov model for a two-tier cellular network having a FIFO queue in the microcell tier. The performance of the model is then compared with those of a previously proposed model having a queue in the macrocell tier and the effect of having a queue in the microcell or macrocell on both high and low speed users is observed. Keywords—Blocking probability, FIFO queue, Markov chains, Two-tier cellular networks.
Abstract—A new voltage-mode triple-input single-output multifunction filter using only two curren... more Abstract—A new voltage-mode triple-input single-output multifunction filter using only two current conveyors is presented. The proposed filter which possesses three inputs and single-output can generate all biquadratic filtering functions at the output terminal by selecting different input signal combinations. The validity of the proposed filter is verified through PSPICE simulations.
Several Kalman filtering algorithms have been implemented in the past years. One of these algorit... more Several Kalman filtering algorithms have been implemented in the past years. One of these algorithms uses the moving windowing (MW) approach, which is limited with the use of rectangular windows. In this paper, a generalized moving windowing (GMW) algorithm that utilizes arbitrary shaped windows is proposed. The proposed algorithm has been implemented on a known process and compared with existing algorithms. As a result of this comparison, it is shown that GMW algorithm has a superior performance. I.
Ucus Test Enstrumantasyonu (FTI) sensorler ile donatilmis helikopter gibi bir deneysel hava araci... more Ucus Test Enstrumantasyonu (FTI) sensorler ile donatilmis helikopter gibi bir deneysel hava aracinin belirli kosullarda ve manevralarda ucus testlerinin yapilip davranislarinin izlenmesi ve kayit altina alinmasindan sorumludur. Gerinim, yuk, basinc, ivme, titresim ve sicaklik gibi helikopterlerin performans, yapisal dinamik, kullanim, guvenilirlik ve bakim olcumleri icin cesitli test verileri toplanmaktadir. Cesitli sensorlerden toplanan verilerin kapsamli bir sekilde islenmesi ve filtrelenmesi gerekmektedir. Geleneksel olarak bu parametreler elektriksel ve mekanik sensorler kullanilarak elde edilmektedir. Helikopter uzerindeki donen yapilar bu sensorlerin dogrulugunu ve omrunu etkileyebilecek titresimlere neden olmaktadir. Ayrica sicaklik, nem ve korozyonun geleneksel sensorler uzerinde olumsuz etkileri vardir. Bu geleneksel sensorleri baglamak icin cok sayida kablo kullanilmasi, kablolamada karmasikliga, fazladan agirliga ve maliyete neden olmaktadir. Diger taraftan, fiber optik s...
— A new current-mode multifunction filter using minimum number of passive elements is proposed. T... more — A new current-mode multifunction filter using minimum number of passive elements is proposed. The proposed filter has single-input and four high-impedance outputs. It uses four passive elements (two capacitors and two resistors) and four dual output second generation current conveyors. Each output provides a different filter response, namely, low-pass, high-pass, band-pass and band-reject. The sensitivity analysis is carried out on both ideal and non-ideal filter configurations. The validity of the proposed filter is verified through PSPICE simulations and compared with the Sallen-Key filter response. Keywords — Active filter, Universal filter, Current conveyors . I. INTRODUCTIONECENTLY there is a growing interest to current-mode multifunction filters employing current conveyors [1-2], which are accepted to have wider bandwidth and greater linearity compared to voltage mode operational amplifiers [3-4]. Second generation current conveyors (CCIIs) have been found very useful in fil...
Two-tier cellular networks provide an enhanced use of the networks' resources for both high a... more Two-tier cellular networks provide an enhanced use of the networks' resources for both high and low speed users. However, they cause an increase in the number of handoffs between cells due to having smaller cell sizes in the microcell tier. An effective approach used to prevent the dropping of ongoing calls in a network is delaying these calls in a queue until a channel becomes available. In this paper, we propose a new Markov model for a two-tier cellular network having a FIFO queue in the microcell tier. The performance of the model is then compared with those of a previously proposed model having a queue in the macrocell tier and the effect of having a queue in the microcell or macrocell on both high and low speed users is observed. Keywords—Blocking probability, FIFO queue, Markov chains, Two-tier cellular networks.
2011 International Symposium on Innovations in Intelligent Systems and Applications, 2011
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbe... more In this work, hetero-core optical fibers were used instead of multimode optical fibers in microbend sensors and it was concluded from the experiments that, using hetero-core fiber instead of multimode fiber with the same core diameter for microbending sensors, turns out to be a more sensitive sensor configuration. Multimode fibers were used instead of single mode fibers in the hetero-core section of the hetero-core optical fibers for the first time. In addition to that, by using the data taken from microbend force sensors, the ability of Artificial Neural Networks (ANNs) in the prediction of force values was also analyzed. Multilayer Perceptron with different algorithms were used as a ANN model. All algorithms used can predict force values with considerable errors. Furthermore, an intelligent and multiple sensor architecture were suggested by using ANNs to get more sensitive and accurate measurement results.
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