Pub Date : 2014-05-14DOI: 10.1109/ECTICON.2014.6839809
Pattrawut Srimuang, N. Puangngernmak, S. Chalermwisutkul
Radio frequency power amplifiers (RF PA) are widely used for several applications e.g. wireless communication, wireless power transmission (WPT) and radio frequency heating. In general, the choice of power amplifier's operating class is based on requirements regarding linearity and power efficiency. For applications in which linearity is not a critical issue whereas high efficiency is desired, switched-mode amplifier e.g. class E is suitable. Switched-mode operation of class E offers high efficiency with a simple topology, leading to optimal costs of production and system operation. This work presents design and implementation of a high power and high efficiency 13.56 MHz class E power amplifier with parallel load circuit. As a power device, LDMOS was chosen. The fabricated class E PA provides Power-Added Efficiency (PAE) of 94.6% with 21.92 power gain when maximum output power of 44.92 dBm (31 W) is delivered to the load. Industrial, Scientific and medical (ISM) bands Class E PA with parallel load circuit.
{"title":"13.56 MHz class E power amplifier with 94.6% efficiency and 31 watts output power for RF heating applications","authors":"Pattrawut Srimuang, N. Puangngernmak, S. Chalermwisutkul","doi":"10.1109/ECTICON.2014.6839809","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839809","url":null,"abstract":"Radio frequency power amplifiers (RF PA) are widely used for several applications e.g. wireless communication, wireless power transmission (WPT) and radio frequency heating. In general, the choice of power amplifier's operating class is based on requirements regarding linearity and power efficiency. For applications in which linearity is not a critical issue whereas high efficiency is desired, switched-mode amplifier e.g. class E is suitable. Switched-mode operation of class E offers high efficiency with a simple topology, leading to optimal costs of production and system operation. This work presents design and implementation of a high power and high efficiency 13.56 MHz class E power amplifier with parallel load circuit. As a power device, LDMOS was chosen. The fabricated class E PA provides Power-Added Efficiency (PAE) of 94.6% with 21.92 power gain when maximum output power of 44.92 dBm (31 W) is delivered to the load. Industrial, Scientific and medical (ISM) bands Class E PA with parallel load circuit.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123005127","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839892
D. Srimoon
This paper presents a flat monopole over rectangle box ground plane. The monopole element is contributed from copper that coated on surface of the FR4 and rectangle box ground plane is contributed from brass sheets. The antenna provides the frequency range of 1.4-3.4 GHz with the return loss <;-15 dB and average gain of 5.5 dBi. The HPBW is 108 degrees in the horizontal plane and 88 degrees in the vertical plane at the central band. The front-to-back ratios are greater than 8 dB across operating band with the ground plane of 80 mm × 50 mm and height of 35 mm. The antenna is suitable to use as a base station antenna.
{"title":"A flat monopole over rectangle box ground plane","authors":"D. Srimoon","doi":"10.1109/ECTICON.2014.6839892","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839892","url":null,"abstract":"This paper presents a flat monopole over rectangle box ground plane. The monopole element is contributed from copper that coated on surface of the FR4 and rectangle box ground plane is contributed from brass sheets. The antenna provides the frequency range of 1.4-3.4 GHz with the return loss <;-15 dB and average gain of 5.5 dBi. The HPBW is 108 degrees in the horizontal plane and 88 degrees in the vertical plane at the central band. The front-to-back ratios are greater than 8 dB across operating band with the ground plane of 80 mm × 50 mm and height of 35 mm. The antenna is suitable to use as a base station antenna.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"41 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132653407","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839777
Kriengkri Timsorn, C. Wongchoosuk, Pakaket Wattuya, Sansoen Promdaen, Suwimol Sittichat
We have developed a portable electronic nose (E-nose) based on eight metal oxide gas sensors for classification and prediction of meat freshness. In this study, the E-nose was applied to predict chicken freshness during different storage days. Principal component analysis (PCA) and artificial neural network (ANN) were used to analyze the experiment data. The PCA method can classify the chicken freshness related to storage days. The ANN result shows good agreement with the PCA result. The correct rate in classification of ANN is 97.92%. From PCA and ANN results, it indicates that the E-nose can well classify and predict the freshness of chicken and owns many advantages over other methods including easy operation, rapid detection, high accuracy, and safety for meat.
{"title":"Discrimination of chicken freshness using electronic nose combined with PCA and ANN","authors":"Kriengkri Timsorn, C. Wongchoosuk, Pakaket Wattuya, Sansoen Promdaen, Suwimol Sittichat","doi":"10.1109/ECTICON.2014.6839777","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839777","url":null,"abstract":"We have developed a portable electronic nose (E-nose) based on eight metal oxide gas sensors for classification and prediction of meat freshness. In this study, the E-nose was applied to predict chicken freshness during different storage days. Principal component analysis (PCA) and artificial neural network (ANN) were used to analyze the experiment data. The PCA method can classify the chicken freshness related to storage days. The ANN result shows good agreement with the PCA result. The correct rate in classification of ANN is 97.92%. From PCA and ANN results, it indicates that the E-nose can well classify and predict the freshness of chicken and owns many advantages over other methods including easy operation, rapid detection, high accuracy, and safety for meat.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115657573","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839751
Wuttinan Sereethavekul, M. Ekpanyapong
Smartphone has overcome human life very quickly at this moment since Android was introduced to the world in April 2009. Because of being a smartphone, people can make use of it in vary ways. It can be used as a cellphone, a media player, an internet browser or even a gaming console. It makes people life easier by having it. The Design of Wristband Screen for Android is especially made for getting more accessibility in using Android devices, for instance, view or control a device from a distance. Wristband Screen for Android helps users to keep in touch with their Android devices all the time while those Android devices may be lying down inside a pocket or a backpack. The Wristband Screen for Android itself displays the exact screen of an Android device and users can control their devices from this screen as well. Wristband Screen for Android System is a wearable device prototype.
{"title":"The Design of a Wristband Screen application for interface with Android systems","authors":"Wuttinan Sereethavekul, M. Ekpanyapong","doi":"10.1109/ECTICON.2014.6839751","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839751","url":null,"abstract":"Smartphone has overcome human life very quickly at this moment since Android was introduced to the world in April 2009. Because of being a smartphone, people can make use of it in vary ways. It can be used as a cellphone, a media player, an internet browser or even a gaming console. It makes people life easier by having it. The Design of Wristband Screen for Android is especially made for getting more accessibility in using Android devices, for instance, view or control a device from a distance. Wristband Screen for Android helps users to keep in touch with their Android devices all the time while those Android devices may be lying down inside a pocket or a backpack. The Wristband Screen for Android itself displays the exact screen of an Android device and users can control their devices from this screen as well. Wristband Screen for Android System is a wearable device prototype.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115125618","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839775
A. Sharma, N. Gupta
An impedance matching technique for RF-MEMS switch based microstrip patch antenna is considered in this paper to improve the return loss and impedance bandwidth. It is observed that the impedance matching can be improved by using a lumped element based matching network. The impedance matching technique is performed by using Smith Chart and verified through Ansoft HFSS simulations. An inductor of 1.62 nH in series with CPW transmission line can be used as a lumped element matching network to improve the return loss upto -18dB at resonant frequency of 5 GHz with adequate impedance bandwidth.
{"title":"Impedance matching for RF-MEMS based microstrip patch antenna","authors":"A. Sharma, N. Gupta","doi":"10.1109/ECTICON.2014.6839775","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839775","url":null,"abstract":"An impedance matching technique for RF-MEMS switch based microstrip patch antenna is considered in this paper to improve the return loss and impedance bandwidth. It is observed that the impedance matching can be improved by using a lumped element based matching network. The impedance matching technique is performed by using Smith Chart and verified through Ansoft HFSS simulations. An inductor of 1.62 nH in series with CPW transmission line can be used as a lumped element matching network to improve the return loss upto -18dB at resonant frequency of 5 GHz with adequate impedance bandwidth.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121707329","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839898
Sittichai Boonyarak, P. Prempraneerach
Integration of local incremental planning and potential field is proposed for a motion planning of the car-like robot in this research so that obstacle avoidance and goal seeking could be achieved in real time. The feedback linearization control using a desired trajectory generated from the virtual force of potential function could help accomplishing these objectives. Both attractive and repulsive forces are function of both relative position and velocity between robot-obstacle and robot-target. The motion planning of the car-like robot has been demonstrated using this new local incremental planning when the unknown and dynamics environment contains either fixed multiple obstacles or moving obstacles. Results, demonstrated in Matlab simulation, reveal that the car-like robot can reach the target point and avoid moving obstacles at the same time, which could be implemented for a real car robot in near future.
{"title":"Real-time obstacle avoidance for car robot using potential field and local incremental planning","authors":"Sittichai Boonyarak, P. Prempraneerach","doi":"10.1109/ECTICON.2014.6839898","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839898","url":null,"abstract":"Integration of local incremental planning and potential field is proposed for a motion planning of the car-like robot in this research so that obstacle avoidance and goal seeking could be achieved in real time. The feedback linearization control using a desired trajectory generated from the virtual force of potential function could help accomplishing these objectives. Both attractive and repulsive forces are function of both relative position and velocity between robot-obstacle and robot-target. The motion planning of the car-like robot has been demonstrated using this new local incremental planning when the unknown and dynamics environment contains either fixed multiple obstacles or moving obstacles. Results, demonstrated in Matlab simulation, reveal that the car-like robot can reach the target point and avoid moving obstacles at the same time, which could be implemented for a real car robot in near future.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122029020","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}
This paper presents a preliminary study of quality of experience (QoE) of VoIP that are provided as social network services using Perceptual Evaluation of Speech Quality (PESQ) with Thai and Chinese speech samples. This study focuses on VoIP quality of the free call feature from Facebook and LINE, which are the popular social network site and the popular social network application for Thai users respectively. From this study, it has been found no significant difference between VoIP quality from Facebook and LINE when connected Internet via WLAN. However, it has been found that LINE tends to provide better VoIP quality than Facebook with significant difference (p-value <; 0.05) when connected 3G networks in three forth test conditions, including two test conditions with Thai speech.
{"title":"Quality of experience of VoIP for social network services: Facebook vs LINE over 3G networks in North Bangkok","authors":"Pongpisit Wuttidittachotti, Kiattisak Yochanang, Narumon Chumkot, Tuul Triyason, Therdpong Daengsi","doi":"10.1109/ECTICON.2014.6839876","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839876","url":null,"abstract":"This paper presents a preliminary study of quality of experience (QoE) of VoIP that are provided as social network services using Perceptual Evaluation of Speech Quality (PESQ) with Thai and Chinese speech samples. This study focuses on VoIP quality of the free call feature from Facebook and LINE, which are the popular social network site and the popular social network application for Thai users respectively. From this study, it has been found no significant difference between VoIP quality from Facebook and LINE when connected Internet via WLAN. However, it has been found that LINE tends to provide better VoIP quality than Facebook with significant difference (p-value <; 0.05) when connected 3G networks in three forth test conditions, including two test conditions with Thai speech.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122532865","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839726
Pongchira Kaewkaosai, K. Hongesombut, C. Mitsantisuk
This article proposes a robust controller design of hydro-thermal power system considering of the thermal power plant area connected to the hydro power plant area. The automation generation control of an interconnected hydro-thermal power system with a small Energy Capacitor System (ECS) augmented to both area has been investigated. The controller is used in order to control the frequency robustly and to improve the power system stability due to the uncertainties in load change and energy capacitors in the system. The power from the load changes are introduced into the system and treated it as the uncertainty during the design process. The H-infinity loop-shaping design procedure (H-infinity LSDP) is adopted as the control design procedure in this study. The results reveal that H-infinity LSDP can achieve higher performance and more robustness compared with PID controller.
{"title":"Robust hydro-thermal power system controller considering Energy Capacitor System","authors":"Pongchira Kaewkaosai, K. Hongesombut, C. Mitsantisuk","doi":"10.1109/ECTICON.2014.6839726","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839726","url":null,"abstract":"This article proposes a robust controller design of hydro-thermal power system considering of the thermal power plant area connected to the hydro power plant area. The automation generation control of an interconnected hydro-thermal power system with a small Energy Capacitor System (ECS) augmented to both area has been investigated. The controller is used in order to control the frequency robustly and to improve the power system stability due to the uncertainties in load change and energy capacitors in the system. The power from the load changes are introduced into the system and treated it as the uncertainty during the design process. The H-infinity loop-shaping design procedure (H-infinity LSDP) is adopted as the control design procedure in this study. The results reveal that H-infinity LSDP can achieve higher performance and more robustness compared with PID controller.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122591510","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839879
Parinya Soontornwong, S. Chivapreecha, C. Pradabpet
This paper presents a new structure for Lagrange-type variable fractional-delay (VFD) filter. A new structure is formulated from discrete Pascal transform (DPT) and its Pascal interpolation. The computational complexity which obtained from proposed structure is linear function of VFD filter order as same as the so-called Taylor's series structure and also be modular structure. Unfortunately, Taylor's series structure is suffered from transient error that caused from changing delay parameter but the proposed structure can online adjust delay parameter without transient error. Therefore, a transient-free structure will be the new choice for Lagrange-type VFD filters structure which is suitable for real-time application such as sampling rate conversion (SRC) and timing recovery in digital receiver.
{"title":"A transient-free structure for Lagrange-type variable fractional-delay digital filter","authors":"Parinya Soontornwong, S. Chivapreecha, C. Pradabpet","doi":"10.1109/ECTICON.2014.6839879","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839879","url":null,"abstract":"This paper presents a new structure for Lagrange-type variable fractional-delay (VFD) filter. A new structure is formulated from discrete Pascal transform (DPT) and its Pascal interpolation. The computational complexity which obtained from proposed structure is linear function of VFD filter order as same as the so-called Taylor's series structure and also be modular structure. Unfortunately, Taylor's series structure is suffered from transient error that caused from changing delay parameter but the proposed structure can online adjust delay parameter without transient error. Therefore, a transient-free structure will be the new choice for Lagrange-type VFD filters structure which is suitable for real-time application such as sampling rate conversion (SRC) and timing recovery in digital receiver.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124168926","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 : 2014-05-14DOI: 10.1109/ECTICON.2014.6839847
A. Chaichana, M. Kumngern, W. Jaikla
An analog second order current-mode filter is described in this paper. The proposed filter uses only a single active building block, namely current following cascaded transconductance amplifier with two grounded capacitors which is attractive for monolithic chip implementation. The circuit has four inputs and single output currents. Five standard functions, namely low-pass, high-pass, band-pass, band-reject and all-pass functions, are given. The natural pole frequency and quality factor can be tuned electronically via the input bias current. The inverting-type input current signal is not required for realization of all-pass function. High output impedance is achieved which is convenient to cascade in current-mode circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation.
{"title":"Electronically tunable versatile current-mode MISO universal filter including minimum component count circuits","authors":"A. Chaichana, M. Kumngern, W. Jaikla","doi":"10.1109/ECTICON.2014.6839847","DOIUrl":"https://doi.org/10.1109/ECTICON.2014.6839847","url":null,"abstract":"An analog second order current-mode filter is described in this paper. The proposed filter uses only a single active building block, namely current following cascaded transconductance amplifier with two grounded capacitors which is attractive for monolithic chip implementation. The circuit has four inputs and single output currents. Five standard functions, namely low-pass, high-pass, band-pass, band-reject and all-pass functions, are given. The natural pole frequency and quality factor can be tuned electronically via the input bias current. The inverting-type input current signal is not required for realization of all-pass function. High output impedance is achieved which is convenient to cascade in current-mode circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation.","PeriodicalId":347166,"journal":{"name":"2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126445669","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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