Pub Date : 2010-06-15DOI: 10.1109/ICIEA.2010.5516688
Chun‐An Cheng, Hung-Liang Cheng, Kun-Jheng Lin, E. Chang, C. Yen
The digitally dimming control interface is a new kind of dimming control for a variety of lighting applications, including building, office, and conference room; it also features remote control, real-time dimming control and lamp condition recognition. The conventional RS-232-based digitally dimming lighting system for fluorescent lamps consists of a power-factor corrector and a half-bridge resonant inverter as the main circuit, and a microcontroller-based driver and dimmer as a controller. The drawbacks of this conventional lighting system are its short transmission length and low transmission speed, and that each lighting area needs its own driver and dimmer circuit, which results in large numbers of circuit components and non-cost-effectiveness for multi-area lighting control of fluorescent lamps. Therefore, this paper presents a new digitally dimming control lighting system for fluorescent lamps. The main goal of the paper is to boost the transmission length and speed with use of a new transmission interface. A compact universal-serial-bus (USB)-based lighting system for two lighting areas are developed and measured using the function of remote dimming control in order to improve the transmission speed and to reduce circuit components as compared with the conventional version.
{"title":"Implementation of a digitally dimming controlled lighting system for two-area fluorescent lamps","authors":"Chun‐An Cheng, Hung-Liang Cheng, Kun-Jheng Lin, E. Chang, C. Yen","doi":"10.1109/ICIEA.2010.5516688","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5516688","url":null,"abstract":"The digitally dimming control interface is a new kind of dimming control for a variety of lighting applications, including building, office, and conference room; it also features remote control, real-time dimming control and lamp condition recognition. The conventional RS-232-based digitally dimming lighting system for fluorescent lamps consists of a power-factor corrector and a half-bridge resonant inverter as the main circuit, and a microcontroller-based driver and dimmer as a controller. The drawbacks of this conventional lighting system are its short transmission length and low transmission speed, and that each lighting area needs its own driver and dimmer circuit, which results in large numbers of circuit components and non-cost-effectiveness for multi-area lighting control of fluorescent lamps. Therefore, this paper presents a new digitally dimming control lighting system for fluorescent lamps. The main goal of the paper is to boost the transmission length and speed with use of a new transmission interface. A compact universal-serial-bus (USB)-based lighting system for two lighting areas are developed and measured using the function of remote dimming control in order to improve the transmission speed and to reduce circuit components as compared with the conventional version.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129846487","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514856
Xiujie Dong, Jingchang Zhang, Xu Chen, Shengjie Ma
Electrostatic discharge (ESD) model on human body has been constructed. “The Experiment Simulation system of ESD model on human body to detonate gas” has been made. The experimental system can measure the gas concentration of explosion and electrostatic potential on human body discharge, resistance and capacitance values in different oxygen concentration and temperature. Measurement accuracy of gas concentration can achieve 0.1 percent in this system. And the most likely to set off gas concentration in coal mine environment can be got, and the results show most likely to detonate the gas concentration was 8.5%, rather than the more easily the higher the concentration of gas detonation. When the human body capacitance is at 1800pF, a sufficient condition will be provided, as long as static voltage of 600V on human body, which can field strength of the breakdown 0.3mm gap in the gas mixture. The academic and experimental evidence can be provided for enacting safety standards for human body electrostatic in coal mine.
{"title":"Research of detonating gas simulation system of ESD model on human body in coal mine","authors":"Xiujie Dong, Jingchang Zhang, Xu Chen, Shengjie Ma","doi":"10.1109/ICIEA.2010.5514856","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514856","url":null,"abstract":"Electrostatic discharge (ESD) model on human body has been constructed. “The Experiment Simulation system of ESD model on human body to detonate gas” has been made. The experimental system can measure the gas concentration of explosion and electrostatic potential on human body discharge, resistance and capacitance values in different oxygen concentration and temperature. Measurement accuracy of gas concentration can achieve 0.1 percent in this system. And the most likely to set off gas concentration in coal mine environment can be got, and the results show most likely to detonate the gas concentration was 8.5%, rather than the more easily the higher the concentration of gas detonation. When the human body capacitance is at 1800pF, a sufficient condition will be provided, as long as static voltage of 600V on human body, which can field strength of the breakdown 0.3mm gap in the gas mixture. The academic and experimental evidence can be provided for enacting safety standards for human body electrostatic in coal mine.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128520900","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}
Affinity propagation (AP) is a new powerful clustering algorithm based message passing between data points. One of the major problems in clustering is the determination of the optimal number of clusters. In this paper, we propose a new approach called Affinity Propagation Clustering based Particle Swarm Optimization (PSO-AP), which using Particle Swarm Optimization (PSO) algorithm to determination of the optimal clustering number of AP. Our PSO-AP method is absolutely “automatic”. PSO-AP represents the issue of finding the optimal clustering number of AP as an optimization problem of searching optimal solution of the input “preferences” space. It evaluates the particles' fitness using clustering validation indexes. Bounded constraint strategy of PSO used supervisor-student model. Several experiments data sets are presented to illustrate the simplicity and effectiveness of PSO-AP.
{"title":"Automatically determining the number of Affinity Propagation Clustering using Particle Swarm","authors":"Xianhui Wang, Xuanping Zhang, Chun-xiao Zhuang, Zu-ning Chen, Zheng Qin","doi":"10.1109/ICIEA.2010.5514680","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514680","url":null,"abstract":"Affinity propagation (AP) is a new powerful clustering algorithm based message passing between data points. One of the major problems in clustering is the determination of the optimal number of clusters. In this paper, we propose a new approach called Affinity Propagation Clustering based Particle Swarm Optimization (PSO-AP), which using Particle Swarm Optimization (PSO) algorithm to determination of the optimal clustering number of AP. Our PSO-AP method is absolutely “automatic”. PSO-AP represents the issue of finding the optimal clustering number of AP as an optimization problem of searching optimal solution of the input “preferences” space. It evaluates the particles' fitness using clustering validation indexes. Bounded constraint strategy of PSO used supervisor-student model. Several experiments data sets are presented to illustrate the simplicity and effectiveness of PSO-AP.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128193056","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5516968
M. Ahmad, M. S. Ramli, M. Zawawi, R. R. Raja Ismail
This paper presents investigations into the development of hybrid control schemes for sway suppression and rotational angle tracking of a rotary crane system. A lab-scaled rotary crane is considered and the dynamic model of the system is derived using the Euler-lagrange formulation. To study the effectiveness of the controllers, initially a collocated proportional-derivative (PD) controller is developed for control of rotary motion. This is then extended to incorporate a non-collocated PID controller for control of sway angle of the pendulum. Implementation results of the response of the rotary crane system with the controllers are presented in time and frequency domains. The performances of the control schemes are assessed in terms of level of sway reduction, rotational angle tracking capability and time response specifications. Finally, a comparative assessment of the control techniques is presented and discussed.
{"title":"Hybrid collocated PD with non-collocated PID for sway control of a lab-scaled rotary crane","authors":"M. Ahmad, M. S. Ramli, M. Zawawi, R. R. Raja Ismail","doi":"10.1109/ICIEA.2010.5516968","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5516968","url":null,"abstract":"This paper presents investigations into the development of hybrid control schemes for sway suppression and rotational angle tracking of a rotary crane system. A lab-scaled rotary crane is considered and the dynamic model of the system is derived using the Euler-lagrange formulation. To study the effectiveness of the controllers, initially a collocated proportional-derivative (PD) controller is developed for control of rotary motion. This is then extended to incorporate a non-collocated PID controller for control of sway angle of the pendulum. Implementation results of the response of the rotary crane system with the controllers are presented in time and frequency domains. The performances of the control schemes are assessed in terms of level of sway reduction, rotational angle tracking capability and time response specifications. Finally, a comparative assessment of the control techniques is presented and discussed.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128196001","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515149
C. Chiang, Chiang Chen
Homogeneous Charge Compression Ignition (HCCI) engines provide a possible solution for affordable, efficient and clean-burning power sources for either stationary power generator or advanced vehicles. In fact, HCCI engines integrate the advantages of both the spark ignition (SI) and compression ignition (CI) engines: (i) high fuel efficiency resulting from high compression ratio and rapid heat release and (ii) low NOx and low particulate matter (PM) emissions due to low cylinder peak temperature. Control of the HCCI engine, however, is difficult since its ignition cannot be directly actuated. The autoignition timing of HCCI combustion is determined by the cylinder charge conditions, rather than the spark timing or the fuel injection timing that are used to initiate combustion in SI and CI engines, respectively. Instead, controlled autoignition requires regulation of the charge properties, especially charge temperature, as demonstrated by many experimental results. Moreover, in order to realize the HCCI technology, several constraints in the system need to be considered. First, the combustion rate or cylinder pressure gradient should be constrained to avoid knocking. Since point-wise in time constraints in the combustion rate is needed constrained control will be necessary for the fuel and rebreathing lift commands. Second, the actuator constrains such as the limit range of the valve lift should also be explicitly take into account. For the purpose of model-based control development, we intend to first develop a HCCI engine model by extending a single cylinder HCCI engine model. The existence of a physics-based engine model, pointwise-in-time constraints and multiple actuators motivate the application of model-based optimization-control approaches such as Model Predictive Control (MPC). The model is used to predict the behavior of the system over a future horizon and an optimization-based methodology ensures optimal performance and satisfaction of constraints.
{"title":"Constrained control of Homogeneous Charge Compression Ignition (HCCI) engines","authors":"C. Chiang, Chiang Chen","doi":"10.1109/ICIEA.2010.5515149","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515149","url":null,"abstract":"Homogeneous Charge Compression Ignition (HCCI) engines provide a possible solution for affordable, efficient and clean-burning power sources for either stationary power generator or advanced vehicles. In fact, HCCI engines integrate the advantages of both the spark ignition (SI) and compression ignition (CI) engines: (i) high fuel efficiency resulting from high compression ratio and rapid heat release and (ii) low NOx and low particulate matter (PM) emissions due to low cylinder peak temperature. Control of the HCCI engine, however, is difficult since its ignition cannot be directly actuated. The autoignition timing of HCCI combustion is determined by the cylinder charge conditions, rather than the spark timing or the fuel injection timing that are used to initiate combustion in SI and CI engines, respectively. Instead, controlled autoignition requires regulation of the charge properties, especially charge temperature, as demonstrated by many experimental results. Moreover, in order to realize the HCCI technology, several constraints in the system need to be considered. First, the combustion rate or cylinder pressure gradient should be constrained to avoid knocking. Since point-wise in time constraints in the combustion rate is needed constrained control will be necessary for the fuel and rebreathing lift commands. Second, the actuator constrains such as the limit range of the valve lift should also be explicitly take into account. For the purpose of model-based control development, we intend to first develop a HCCI engine model by extending a single cylinder HCCI engine model. The existence of a physics-based engine model, pointwise-in-time constraints and multiple actuators motivate the application of model-based optimization-control approaches such as Model Predictive Control (MPC). The model is used to predict the behavior of the system over a future horizon and an optimization-based methodology ensures optimal performance and satisfaction of constraints.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127104571","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5515638
Lin Gao, Junrong Xia, Yiping Dai
As shown in many recent works, the load-frequency behavior can be represented by system frequency response models especially for an islanding process. In this paper, a frequency response model incorporating an under-frequency load-shedding scheme is presented for islanding power system simulations. The model was applied for a practical power system with both hydro and fossil-fired power generators. The governing system models are involved in the model, which have great impact on the system dynamics. Parameter identification method is used to find and verify the model parameters. Similar responses were observed between the simulations and the accident records. The simulation results showed disadvantages of the primary frequency control systems of hydro power generators at the beginning of the load disturbances. An closed fossil fired power plant is proposed to serve against the load disturbances and improved stability was observed according to the system simulation results.
{"title":"Analysis of power system frequency responses with hydro turbines incorporating load shedding","authors":"Lin Gao, Junrong Xia, Yiping Dai","doi":"10.1109/ICIEA.2010.5515638","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5515638","url":null,"abstract":"As shown in many recent works, the load-frequency behavior can be represented by system frequency response models especially for an islanding process. In this paper, a frequency response model incorporating an under-frequency load-shedding scheme is presented for islanding power system simulations. The model was applied for a practical power system with both hydro and fossil-fired power generators. The governing system models are involved in the model, which have great impact on the system dynamics. Parameter identification method is used to find and verify the model parameters. Similar responses were observed between the simulations and the accident records. The simulation results showed disadvantages of the primary frequency control systems of hydro power generators at the beginning of the load disturbances. An closed fossil fired power plant is proposed to serve against the load disturbances and improved stability was observed according to the system simulation results.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127166648","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514728
Zhiming Zhao, Xiaoyang Yuan
This paper develops backstepping-sliding mode control method for multi-input and multi-out nonlinear system. In order to solve the chattering problem, three continuous functions are introduced and the error function is employed as the sliding surface function finally after detailed comparison. Certain kind of two-axis tracking system is taken as an example. And dynamic model of the system is established based on Lagrange-Maxwell electromechanical equations, and controller designing based on the above developed control method is presented in detail. The simulation using Matlab are presented, which obtained controllers on the basis of backstepping method and backstepping-sliding mode control method, respectively. Comparison between them indicates that it is proper and effective for the two-axis tracking system to employ the controller designed based to backstepping-sliding mode control method. Simulation results based on improved sliding surface function are also presented which prove it is applicable to use error function in backstepping-sliding mode control method. Based on simulation results presented, the position tracking accuracy of the two-axis system can meet the project's need.
{"title":"Backstepping designed sliding mode control for a two-axis tracking system","authors":"Zhiming Zhao, Xiaoyang Yuan","doi":"10.1109/ICIEA.2010.5514728","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514728","url":null,"abstract":"This paper develops backstepping-sliding mode control method for multi-input and multi-out nonlinear system. In order to solve the chattering problem, three continuous functions are introduced and the error function is employed as the sliding surface function finally after detailed comparison. Certain kind of two-axis tracking system is taken as an example. And dynamic model of the system is established based on Lagrange-Maxwell electromechanical equations, and controller designing based on the above developed control method is presented in detail. The simulation using Matlab are presented, which obtained controllers on the basis of backstepping method and backstepping-sliding mode control method, respectively. Comparison between them indicates that it is proper and effective for the two-axis tracking system to employ the controller designed based to backstepping-sliding mode control method. Simulation results based on improved sliding surface function are also presented which prove it is applicable to use error function in backstepping-sliding mode control method. Based on simulation results presented, the position tracking accuracy of the two-axis system can meet the project's need.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128938951","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514688
Quan-Xi Yang
According to the temporal characteristic and the spatial characteristic of video sequence, a novel recognition method of sign language spatio-temporal appearance modeling is introduced for the vision-based multi-features classifier of Chinese sign language recognition. The obvious advantage with such a novel approach is that we can exclude some skin-like object and tracking the moving recognized hand more precisely in the sign language video sequence. Experiments demonstrate that this new modeling method is feasible and robust. At first, dynamic sign language appearance modeling is done, and then classification method of SVMs for recognition is brought into use. Experimentation with 30 groups of the Chinese manual alphabet images is conducted and the results prove that this appearance modeling method is simple, efficient, and effective for characterizing hand gestures, and the SVMs method has excellent classification and generalization ability in solving learning problem with small training set of sample in sign language recognition. The experimentation shows that linear kernel function is suitable for sign language recognition, and the best recognition rate of 99.7% of letter ‘F’ image group is achieved.
{"title":"Chinese sign language recognition based on video sequence appearance modeling","authors":"Quan-Xi Yang","doi":"10.1109/ICIEA.2010.5514688","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514688","url":null,"abstract":"According to the temporal characteristic and the spatial characteristic of video sequence, a novel recognition method of sign language spatio-temporal appearance modeling is introduced for the vision-based multi-features classifier of Chinese sign language recognition. The obvious advantage with such a novel approach is that we can exclude some skin-like object and tracking the moving recognized hand more precisely in the sign language video sequence. Experiments demonstrate that this new modeling method is feasible and robust. At first, dynamic sign language appearance modeling is done, and then classification method of SVMs for recognition is brought into use. Experimentation with 30 groups of the Chinese manual alphabet images is conducted and the results prove that this appearance modeling method is simple, efficient, and effective for characterizing hand gestures, and the SVMs method has excellent classification and generalization ability in solving learning problem with small training set of sample in sign language recognition. The experimentation shows that linear kernel function is suitable for sign language recognition, and the best recognition rate of 99.7% of letter ‘F’ image group is achieved.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131083687","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514720
C. P. Laksana, Meei-Ru Chen, H. Kao, E. Jeng, S. Jian
Epitaxial single crystal AlN thin films have been obtained on (001) sapphire substrates by helicon sputtering system at growth temperature of 450°C. Surface acoustic wave (SAW) filters were fabricated on AlN/sapphire. The center frequency is 354.2MHz, which corresponds to a phase velocity of 5667 m/s. The insertion loss and sidelobe rejection were about 24.9dB and 11.4dB, respectively. The value of TCF is measured to be −74.9 ppm/°C and −65.76 ppm/°C at 0.4 µm and 1 µm of film thickness, respectively. The temperature coefficient of frequency (TCF) of AlN/sapphire shows proportional to the film thickness. A frequency downshift about 43 KHz was observed when the UV source with the wavelength of around 200nm and 12 mW/cm2 of power density radiates the surface of SAW devices.
{"title":"Deep UV sensors using surface acoustic wave oscillators fabricated on single crystalline AlN films grown on sapphire substrates","authors":"C. P. Laksana, Meei-Ru Chen, H. Kao, E. Jeng, S. Jian","doi":"10.1109/ICIEA.2010.5514720","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514720","url":null,"abstract":"Epitaxial single crystal AlN thin films have been obtained on (001) sapphire substrates by helicon sputtering system at growth temperature of 450°C. Surface acoustic wave (SAW) filters were fabricated on AlN/sapphire. The center frequency is 354.2MHz, which corresponds to a phase velocity of 5667 m/s. The insertion loss and sidelobe rejection were about 24.9dB and 11.4dB, respectively. The value of TCF is measured to be −74.9 ppm/°C and −65.76 ppm/°C at 0.4 µm and 1 µm of film thickness, respectively. The temperature coefficient of frequency (TCF) of AlN/sapphire shows proportional to the film thickness. A frequency downshift about 43 KHz was observed when the UV source with the wavelength of around 200nm and 12 mW/cm2 of power density radiates the surface of SAW devices.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130591727","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 : 2010-06-15DOI: 10.1109/ICIEA.2010.5514692
Y. Liu, H. Loh
Single term based document representations, e.g. bag-of-words, have been widely accepted in the machine learning, information retrieval and text mining community. One notable limitation of such methods is that they do not consider the rich information resident in the semantic relations among terms. This paper reports our approach of concepts handling in document representation and its effect on the performance of text categorization. We introduce a Frequent word Sequence algorithm that generates concept-centered phrases to render domain knowledge concepts. Our experimental study based on a domain centered corpus shows that a consistent performance improvement can be achieved when concept-centered phrases are included in addition to the single term based features in document representations. We also observed that a universally suitable support threshold does not exist and the removal of concept irrelevant sequences can possibly further improve the performance at a lower support level.
{"title":"Domain concept handling in automated text categorization","authors":"Y. Liu, H. Loh","doi":"10.1109/ICIEA.2010.5514692","DOIUrl":"https://doi.org/10.1109/ICIEA.2010.5514692","url":null,"abstract":"Single term based document representations, e.g. bag-of-words, have been widely accepted in the machine learning, information retrieval and text mining community. One notable limitation of such methods is that they do not consider the rich information resident in the semantic relations among terms. This paper reports our approach of concepts handling in document representation and its effect on the performance of text categorization. We introduce a Frequent word Sequence algorithm that generates concept-centered phrases to render domain knowledge concepts. Our experimental study based on a domain centered corpus shows that a consistent performance improvement can be achieved when concept-centered phrases are included in addition to the single term based features in document representations. We also observed that a universally suitable support threshold does not exist and the removal of concept irrelevant sequences can possibly further improve the performance at a lower support level.","PeriodicalId":234296,"journal":{"name":"2010 5th IEEE Conference on Industrial Electronics and Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131944005","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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