Pub Date : 2012-05-16DOI: 10.1109/ECTICON.2012.6254227
J. Prabket, W. Itthikusaman, A. Poyai
The current-voltage (I-V) and capacitance-voltage (C-V) measurements of Aluminum (Al) Schottky contacts on undoped and platinum-doped NTD n-Silicon were carried out in the temperature range of 300-420 K. The I-V and C-V characteristics were used to extract the saturation current, the ideality factor and the Schottky barrier height of the diodes. These parameters were correlated to the defect levels generated by the Pt in silicon. The results show that the saturation current of Pt doped diode is reduced and the Schottky barrier height of the diode is higher than from that of the diodes fabricated on undoped silicon diodes. This high value of the Schottky barrier height shows that Pt in silicon creates donor levels in the energy gap that compensate electrons to reduce the conductivity of the material. Such the Pt doped diodes have been found to perform better as low loss rectifiers due to there have less leakage current than undoped devices.
{"title":"Evaluation of Schottky barrier parameters of Al Schottky contacts on platinum doped n-silicon","authors":"J. Prabket, W. Itthikusaman, A. Poyai","doi":"10.1109/ECTICON.2012.6254227","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254227","url":null,"abstract":"The current-voltage (I-V) and capacitance-voltage (C-V) measurements of Aluminum (Al) Schottky contacts on undoped and platinum-doped NTD n-Silicon were carried out in the temperature range of 300-420 K. The I-V and C-V characteristics were used to extract the saturation current, the ideality factor and the Schottky barrier height of the diodes. These parameters were correlated to the defect levels generated by the Pt in silicon. The results show that the saturation current of Pt doped diode is reduced and the Schottky barrier height of the diode is higher than from that of the diodes fabricated on undoped silicon diodes. This high value of the Schottky barrier height shows that Pt in silicon creates donor levels in the energy gap that compensate electrons to reduce the conductivity of the material. Such the Pt doped diodes have been found to perform better as low loss rectifiers due to there have less leakage current than undoped devices.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"33 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81642687","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254184
Y. Kanthaphayao, U. Kamnarn, V. Chunkag
This paper presents a redundant operation of a modular three-phase AC/DC converter based on a distributed control method. For the flexibility and redundant operation purpose, each converter module employs an individual controller to control the power converter operation. The mathematical model to design the output voltage control is described in this paper. The performance evaluation was conducted via a four-module of a single phase CUK AC/DC converter, with a -48V DC output voltage and a 750W load. The proposed system is verified by simulations using MATLAB/Simulink. The system has achieved as the following: a tight output voltage regulation, a current sharing of each module is quite good, and a redundant operation of the system can be operated through the distributed control.
{"title":"Redundant operation with a distributed control for a modular three-phase AC/DC converter","authors":"Y. Kanthaphayao, U. Kamnarn, V. Chunkag","doi":"10.1109/ECTICON.2012.6254184","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254184","url":null,"abstract":"This paper presents a redundant operation of a modular three-phase AC/DC converter based on a distributed control method. For the flexibility and redundant operation purpose, each converter module employs an individual controller to control the power converter operation. The mathematical model to design the output voltage control is described in this paper. The performance evaluation was conducted via a four-module of a single phase CUK AC/DC converter, with a -48V DC output voltage and a 750W load. The proposed system is verified by simulations using MATLAB/Simulink. The system has achieved as the following: a tight output voltage regulation, a current sharing of each module is quite good, and a redundant operation of the system can be operated through the distributed control.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"54 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90547388","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254265
U. Kongmuang, R. Wongsan
This paper presents a 1×4 asymmetric Y-shaped slit loaded microstrip array antenna. The antenna consists of a rectangular patch with four asymmetric Y-shaped slits at the patch corners and a double thickness of FR4 substrate. This antenna will be most utilized in WLAN applications. A modified array antenna configuration is proposed radiation pattern and gain characteristics to enhancement. The radiation patterns adjusting of antenna array are improved by array element spacing from λ/2 down to λ/3. In addition, position and size of slit loads on each of some patches in antenna array can adjust for good directive radiation pattern. The simulation results of the radiation pattern, reflection coefficient magnitude are verified by IE3D software. Result good agreement between our simulation and the measurement. Consequently, this proposed antenna array is appropriate for multiband wireless communications.
{"title":"Investigated gain and radiation pattern of array antenna with asymmetric y-shaped slit loads MSA","authors":"U. Kongmuang, R. Wongsan","doi":"10.1109/ECTICON.2012.6254265","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254265","url":null,"abstract":"This paper presents a 1×4 asymmetric Y-shaped slit loaded microstrip array antenna. The antenna consists of a rectangular patch with four asymmetric Y-shaped slits at the patch corners and a double thickness of FR4 substrate. This antenna will be most utilized in WLAN applications. A modified array antenna configuration is proposed radiation pattern and gain characteristics to enhancement. The radiation patterns adjusting of antenna array are improved by array element spacing from λ/2 down to λ/3. In addition, position and size of slit loads on each of some patches in antenna array can adjust for good directive radiation pattern. The simulation results of the radiation pattern, reflection coefficient magnitude are verified by IE3D software. Result good agreement between our simulation and the measurement. Consequently, this proposed antenna array is appropriate for multiband wireless communications.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"112 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90471492","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254119
A. Nosan, R. Punchalard
The gradient algorithm used absolute value of error signal as a criterion to adjust the filter coefficient of adaptive IIR notch filter is presented in this paper. The objective is to estimate or track the frequency of a single sinusoidal signal corrupted by additive white Gaussian noise. The proposed algorithm can solve the problem of selecting an initial condition as met in the previous method. Moreover, it also has a high convergence speed.
{"title":"Absolute Gradient Algorithm for Adaptive IIR Notch Filter","authors":"A. Nosan, R. Punchalard","doi":"10.1109/ECTICON.2012.6254119","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254119","url":null,"abstract":"The gradient algorithm used absolute value of error signal as a criterion to adjust the filter coefficient of adaptive IIR notch filter is presented in this paper. The objective is to estimate or track the frequency of a single sinusoidal signal corrupted by additive white Gaussian noise. The proposed algorithm can solve the problem of selecting an initial condition as met in the previous method. Moreover, it also has a high convergence speed.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"25 6 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78003838","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254241
T. Suwanasri, C. Suwanasri
To minimize maintenance cost, the optimum number of items kept in stock needs primary concern, especially high voltage equipment in electrical system. This paper proposes the method to optimize number of spare parts for effective inventory control. By using Pareto analysis, components of power transformer in the stock are classified into ABC classes. Class A means the few most expensive ones that need special care. Class B means ordinary ones that need standard care. Class C means the large number of cheap items that need little care. Since class A items occupy most of the total inventory cost, the optimum number of class A items, which are bushing and arrester, is of prime interest and can be determined from the failure records of power transformer's components by applying statistical distribution techniques. Therefore, the proposed method can effectively reduce the total inventory cost and can also apply with the other high voltage equipment in the system.
{"title":"Inventory management for high voltage equipment using statistical distribution techniques","authors":"T. Suwanasri, C. Suwanasri","doi":"10.1109/ECTICON.2012.6254241","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254241","url":null,"abstract":"To minimize maintenance cost, the optimum number of items kept in stock needs primary concern, especially high voltage equipment in electrical system. This paper proposes the method to optimize number of spare parts for effective inventory control. By using Pareto analysis, components of power transformer in the stock are classified into ABC classes. Class A means the few most expensive ones that need special care. Class B means ordinary ones that need standard care. Class C means the large number of cheap items that need little care. Since class A items occupy most of the total inventory cost, the optimum number of class A items, which are bushing and arrester, is of prime interest and can be determined from the failure records of power transformer's components by applying statistical distribution techniques. Therefore, the proposed method can effectively reduce the total inventory cost and can also apply with the other high voltage equipment in the system.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"156 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75972551","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254193
T. Lerddararadsamee, Y. Jiraraksopakun
In this paper, we proposed a method for fully-automatic EM segmentation on brain MR images without a priori knowledge. Instead of manually predetermination on number of tissue classes, the proposed method automatically find mean intensities of distinct tissues from the histogram. The brain MR images were chosen to test our proposed method, but our method can, in fact, be general for other MR segmentations using EM with which the Gaussian mixture distribution of an image histogram holds. The results from our method suggested that a fully automatic segmentation using EM can be achieved with no significant difference in segmentation accuracy compared to the conventional EM.
{"title":"Local maximum detection for fully automatic classification of EM algorithm","authors":"T. Lerddararadsamee, Y. Jiraraksopakun","doi":"10.1109/ECTICON.2012.6254193","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254193","url":null,"abstract":"In this paper, we proposed a method for fully-automatic EM segmentation on brain MR images without a priori knowledge. Instead of manually predetermination on number of tissue classes, the proposed method automatically find mean intensities of distinct tissues from the histogram. The brain MR images were chosen to test our proposed method, but our method can, in fact, be general for other MR segmentations using EM with which the Gaussian mixture distribution of an image histogram holds. The results from our method suggested that a fully automatic segmentation using EM can be achieved with no significant difference in segmentation accuracy compared to the conventional EM.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"197 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72776121","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254218
S. Chansareewittaya, P. Jirapong
In this paper, hybrid tabu search and simulated annealing (TSSA) with search space managing methods are proposed to determine the optimal number and allocation of unified power flow controller (UPFC) to enhance power transfer capability of power transactions between generators and loads in power systems. Particular optimal allocation includes optimal locations and parameter settings. The objective function is formulated as maximizing total transfer capability (TTC). Power transfer capability determinations are calculated based on the optimal power flow (OPF) technique. Split and non-split search space managing methods are used to improve the solution searching capability. Test results on IEEE 118-bus system show that the proposed hybrid TSSA with optimal number of UPFC criteria and the split search space managing method give higher than those from non-split search space method.
{"title":"Total transfer capability enhancement with optimal number of UPFC using hybrid TSSA","authors":"S. Chansareewittaya, P. Jirapong","doi":"10.1109/ECTICON.2012.6254218","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254218","url":null,"abstract":"In this paper, hybrid tabu search and simulated annealing (TSSA) with search space managing methods are proposed to determine the optimal number and allocation of unified power flow controller (UPFC) to enhance power transfer capability of power transactions between generators and loads in power systems. Particular optimal allocation includes optimal locations and parameter settings. The objective function is formulated as maximizing total transfer capability (TTC). Power transfer capability determinations are calculated based on the optimal power flow (OPF) technique. Split and non-split search space managing methods are used to improve the solution searching capability. Test results on IEEE 118-bus system show that the proposed hybrid TSSA with optimal number of UPFC criteria and the split search space managing method give higher than those from non-split search space method.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"173 3","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91440196","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254249
Mai Duc Thong, K. Nakano, Y. Toyoda
This paper is concerned with a method of computing the relative power contribution ratio (PCR) between process variables of a Selective Catalytic Reduction (SCR) system in a steam turbine (ST)-gas turbine (GT) combined cycle power plant. The PCR is used to select process variables in the statistical model of the system to be considered. Firstly, we show a method for computing the PCR using a RBF-ARX-based modeling of the SCR. Next, we demonstrate the effectiveness of the PCR in evaluating the identified system. Finally, we consider about a method for computing PCR for general stationary control systems based on Otomo-Nakagawa-Akaike's method, which is applicable to the above-mentioned SCR systems.
{"title":"On the relative power contribution between process variables of SCR control systems for ST-GT combined cycle power plants","authors":"Mai Duc Thong, K. Nakano, Y. Toyoda","doi":"10.1109/ECTICON.2012.6254249","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254249","url":null,"abstract":"This paper is concerned with a method of computing the relative power contribution ratio (PCR) between process variables of a Selective Catalytic Reduction (SCR) system in a steam turbine (ST)-gas turbine (GT) combined cycle power plant. The PCR is used to select process variables in the statistical model of the system to be considered. Firstly, we show a method for computing the PCR using a RBF-ARX-based modeling of the SCR. Next, we demonstrate the effectiveness of the PCR in evaluating the identified system. Finally, we consider about a method for computing PCR for general stationary control systems based on Otomo-Nakagawa-Akaike's method, which is applicable to the above-mentioned SCR systems.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"7 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89734798","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254223
B. Hazarika, N. Afzulpurkar, C. Punyasai, D. Kumar Das
The principle of electron force microscopy is a well-known phenomenon of sensing in high sensitive MEMS based accelerometers & AFM. We intend to extend this concept towards development of a gyroscope, based on the fact that gyroscope sensors are accelerometers, but with a drive mode. In this paper we present a design of a MEMS based tunneling gyroscope with electron tunneling a sense mechanism. The important parameters required for modeling of the single axis gyroscope is like spring constant, damping coefficient and resonance frequencies are calculated using FEA analysis using COVENTORWARE. A SIMULINK based model is used to examine the response behavior of the model.
{"title":"Design, simulation & modelling of MEMS based comb-drive tunneling effect gyroscope","authors":"B. Hazarika, N. Afzulpurkar, C. Punyasai, D. Kumar Das","doi":"10.1109/ECTICON.2012.6254223","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254223","url":null,"abstract":"The principle of electron force microscopy is a well-known phenomenon of sensing in high sensitive MEMS based accelerometers & AFM. We intend to extend this concept towards development of a gyroscope, based on the fact that gyroscope sensors are accelerometers, but with a drive mode. In this paper we present a design of a MEMS based tunneling gyroscope with electron tunneling a sense mechanism. The important parameters required for modeling of the single axis gyroscope is like spring constant, damping coefficient and resonance frequencies are calculated using FEA analysis using COVENTORWARE. A SIMULINK based model is used to examine the response behavior of the model.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"130 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83990197","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254346
S. Kitcharoenwat, M. Konghirun, A. Sangswang
This paper presents a novel single-phase ac-ac converter topology that is capable of creating voltage output to buck or boost mode. The structure of topology uses minimal switches controlled with the two-section overlap in each cycle of the ac input. The proposed topology is simple, low-cost, and contains minimum number of device. The control strategy can regulate a wide output voltage range with low harmonic distortion and improve the power factor. The closed-loop control is divided into two parts. The first part is the voltage control of dual dc-link capacitors, and the second part controls the ac output voltage. In the part of voltage control at the dc-link capacitors, the switches operate in the boost mode. The ac input current is controlled by PID control with the aim for power factor correction. The output voltage is also regulated by the PID control where the sinusoidal pulse-width modulation (sPWM) technique is chosen. The simulation results illustrate the regulated output ac voltage control, the control of the charging dual dc-link voltage capacitors, the response of the input voltage change and the response of the load change.
{"title":"A novel single phase AC-AC converter with power factor control","authors":"S. Kitcharoenwat, M. Konghirun, A. Sangswang","doi":"10.1109/ECTICON.2012.6254346","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254346","url":null,"abstract":"This paper presents a novel single-phase ac-ac converter topology that is capable of creating voltage output to buck or boost mode. The structure of topology uses minimal switches controlled with the two-section overlap in each cycle of the ac input. The proposed topology is simple, low-cost, and contains minimum number of device. The control strategy can regulate a wide output voltage range with low harmonic distortion and improve the power factor. The closed-loop control is divided into two parts. The first part is the voltage control of dual dc-link capacitors, and the second part controls the ac output voltage. In the part of voltage control at the dc-link capacitors, the switches operate in the boost mode. The ac input current is controlled by PID control with the aim for power factor correction. The output voltage is also regulated by the PID control where the sinusoidal pulse-width modulation (sPWM) technique is chosen. The simulation results illustrate the regulated output ac voltage control, the control of the charging dual dc-link voltage capacitors, the response of the input voltage change and the response of the load change.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"76 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88821116","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：