Pub Date : 2010-12-17DOI: 10.1109/ICCAS.2010.5670302
M. M. Anzehaee, M. Haeri, A. Tipi
In this paper, we present a method to dynamically observe two important variables of a Gas Metal Arc Welding (GMAW) process, i.e. arc voltage and arc length. To do this, we use Kalman filter to estimate these two variables in a high level noisy environment of GMAW process both in open and closed loop modes.
{"title":"Gas Metal Arc Welding process control based on arc length and arc voltage","authors":"M. M. Anzehaee, M. Haeri, A. Tipi","doi":"10.1109/ICCAS.2010.5670302","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5670302","url":null,"abstract":"In this paper, we present a method to dynamically observe two important variables of a Gas Metal Arc Welding (GMAW) process, i.e. arc voltage and arc length. To do this, we use Kalman filter to estimate these two variables in a high level noisy environment of GMAW process both in open and closed loop modes.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114936969","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669885
M. Nishiyama, M. Miyamoto, K. Watanabe
This paper describes respiration monitoring during sleep using hetero-core fiber optic pressure sensors. The hetero-core fiber optic sensor has high sensitivity to macro-bending action as a result of the core diameter difference corresponding to the sensor portion due to stable single-mode transmission. Pressure sensors employing hetero-core fiber optics were fabricated to have a wide sensitivity to small pressure changes resulting from minute body motions such as respiration in sleep and large pressure changes such as a roll-over action. The fabricated pressure sensors were installed in a conventional bed. The pressure characteristic performance of all the fabricated pressure sensors was found to show a monotonic response in the optical loss change with weight changes. The sensitivities of the hetero-core pressure sensors for a weight change of 3.0 kg were in the range of 0.55-1.80 dB. Additionally, even in the case of different body postures such as lying on one's side, a slight body movement due to respiration could be detected by the hetero-core pressure sensors.
{"title":"Respiration rhythm monitoring in sleep based on weight movement using hetero-core fiber optic sensors","authors":"M. Nishiyama, M. Miyamoto, K. Watanabe","doi":"10.1109/ICCAS.2010.5669885","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669885","url":null,"abstract":"This paper describes respiration monitoring during sleep using hetero-core fiber optic pressure sensors. The hetero-core fiber optic sensor has high sensitivity to macro-bending action as a result of the core diameter difference corresponding to the sensor portion due to stable single-mode transmission. Pressure sensors employing hetero-core fiber optics were fabricated to have a wide sensitivity to small pressure changes resulting from minute body motions such as respiration in sleep and large pressure changes such as a roll-over action. The fabricated pressure sensors were installed in a conventional bed. The pressure characteristic performance of all the fabricated pressure sensors was found to show a monotonic response in the optical loss change with weight changes. The sensitivities of the hetero-core pressure sensors for a weight change of 3.0 kg were in the range of 0.55-1.80 dB. Additionally, even in the case of different body postures such as lying on one's side, a slight body movement due to respiration could be detected by the hetero-core pressure sensors.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115099482","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5670254
E. Joung
The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design makes it difficult to predict the software failures. Even though the main characteristic of railway system is to ensure safety, nowadays software is widely used in the safety critical railway system just after evaluation of system function itself. The railway system is also safety critical system and the software is widely used in the railway system. For this reason, the safety criteria are suggested to secure the software safety for the field of railway system. The software used in the safety critical system has to be examined whether it is properly developed according to the safety criteria and certification process. This paper also suggests a development methodology for the railway company to easily apply the criteria to the railway system.
{"title":"A study on quality improvement of railway software","authors":"E. Joung","doi":"10.1109/ICCAS.2010.5670254","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5670254","url":null,"abstract":"The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design makes it difficult to predict the software failures. Even though the main characteristic of railway system is to ensure safety, nowadays software is widely used in the safety critical railway system just after evaluation of system function itself. The railway system is also safety critical system and the software is widely used in the railway system. For this reason, the safety criteria are suggested to secure the software safety for the field of railway system. The software used in the safety critical system has to be examined whether it is properly developed according to the safety criteria and certification process. This paper also suggests a development methodology for the railway company to easily apply the criteria to the railway system.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116354273","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669944
S. Tunyasrirut, Boonreung Wangsilabatra, T. Suksri
This paper presents a power thyristors based soft starter strategy for an induction-generator based wind turbine system. Soft-starter is designed to reduce inrush current or surge in current while achieving a proper synchronism between the generator and the grid. The designed soft-starter successfully limits the high inrush current during the connection of the wind-turbine system to the grid. An experimental investigation is done to find out suitable values of the power thyristor for soft-connection of a wind turbine system with the grid. Tests are carried out on a three phase induction generator, based system controller and relays for the system connection/disconnection from the grid. This paper describes the soft-starting principle, the designed soft-starter, application of the soft-starter in wind power generation, and experimental test results.
{"title":"Phase control thyristor based soft-starter for a grid connected induction generator for wind turbine system","authors":"S. Tunyasrirut, Boonreung Wangsilabatra, T. Suksri","doi":"10.1109/ICCAS.2010.5669944","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669944","url":null,"abstract":"This paper presents a power thyristors based soft starter strategy for an induction-generator based wind turbine system. Soft-starter is designed to reduce inrush current or surge in current while achieving a proper synchronism between the generator and the grid. The designed soft-starter successfully limits the high inrush current during the connection of the wind-turbine system to the grid. An experimental investigation is done to find out suitable values of the power thyristor for soft-connection of a wind turbine system with the grid. Tests are carried out on a three phase induction generator, based system controller and relays for the system connection/disconnection from the grid. This paper describes the soft-starting principle, the designed soft-starter, application of the soft-starter in wind power generation, and experimental test results.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116374091","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669746
Hyunki Lee, Hyungsuck Cho, D. Hong
Nowadays, a number of 3D shape measurement methods have been developed such as stereo vision, laser structured light, and Phase Measuring Profilometry (PMP). They have many problems such as correspondence problem, 2π-ambiguity and occlusion problem. Among them, occlusion problem is common problem for 3D shape measurement and well known as difficult to solve. To solve this problem, in our previous research, active imaging system is introduced, which can change the viewing angle without changing of field-of-view (FOV), and can do the FOV with maintaining the viewing angle. And to decide the viewing direction and position, view planning algorithm is developed. The performance of our system is checked by simulation and a series of real experiments.
{"title":"View planning for occluded region with active imaging system","authors":"Hyunki Lee, Hyungsuck Cho, D. Hong","doi":"10.1109/ICCAS.2010.5669746","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669746","url":null,"abstract":"Nowadays, a number of 3D shape measurement methods have been developed such as stereo vision, laser structured light, and Phase Measuring Profilometry (PMP). They have many problems such as correspondence problem, 2π-ambiguity and occlusion problem. Among them, occlusion problem is common problem for 3D shape measurement and well known as difficult to solve. To solve this problem, in our previous research, active imaging system is introduced, which can change the viewing angle without changing of field-of-view (FOV), and can do the FOV with maintaining the viewing angle. And to decide the viewing direction and position, view planning algorithm is developed. The performance of our system is checked by simulation and a series of real experiments.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123708481","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5670118
Changhyun Kim, Han-Wook Cho, Jong-Min Lee, H. Han, Bong-Seup Kim, Dong-Sung Kim
This paper deals with the zero-power control of magnetic levitation (maglev) vehicles that use permanent magnets as well as electromagnets for levitation. The nominal load is levitated by permanent magnet and the current consumption for stable levitation can be reduced. In order to guarantee the tracking capability, the proposed controller is based on the state feedback controller and modified to balance attraction force and total weight. The commanded voltage is used instead of the coil current in the feedback loop so that the current measurement can be avoided. A full-scale hybrid maglev tester was constructed and some experiments were carried out to show the performance of the proposed method.
{"title":"Zero-power control of magnetic levitation vehicles with permanent magnets","authors":"Changhyun Kim, Han-Wook Cho, Jong-Min Lee, H. Han, Bong-Seup Kim, Dong-Sung Kim","doi":"10.1109/ICCAS.2010.5670118","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5670118","url":null,"abstract":"This paper deals with the zero-power control of magnetic levitation (maglev) vehicles that use permanent magnets as well as electromagnets for levitation. The nominal load is levitated by permanent magnet and the current consumption for stable levitation can be reduced. In order to guarantee the tracking capability, the proposed controller is based on the state feedback controller and modified to balance attraction force and total weight. The commanded voltage is used instead of the coil current in the feedback loop so that the current measurement can be avoided. A full-scale hybrid maglev tester was constructed and some experiments were carried out to show the performance of the proposed method.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124045106","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669807
Kang-Hun Lee, Chang-Jun Seo
Recently, the government's U-City projects are underway. Accordingly, interests in home automation are increasing. However generally, sensors and devices of the home automation system are equipped and used in a fixed position. In this paper, the mobile robot for collecting environmental information is applied to home automation. This system has complementary for the existing system that has the limitation of collecting information. The robot has two kinds of main features. First, when the user is not in the house, the robot performs a safety and security feature. Second, when the user is in the house, the user manipulates the robot and plays a simple game. The robot uses Wi-Fi to communicate with the home server. Furthermore, if the home server is not working, the robot comes to the backup server for safety and security. Therefore, we have developed a high-utilization of home robot.
{"title":"Development of user-friendly intelligent home robot focused on safety and security","authors":"Kang-Hun Lee, Chang-Jun Seo","doi":"10.1109/ICCAS.2010.5669807","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669807","url":null,"abstract":"Recently, the government's U-City projects are underway. Accordingly, interests in home automation are increasing. However generally, sensors and devices of the home automation system are equipped and used in a fixed position. In this paper, the mobile robot for collecting environmental information is applied to home automation. This system has complementary for the existing system that has the limitation of collecting information. The robot has two kinds of main features. First, when the user is not in the house, the robot performs a safety and security feature. Second, when the user is in the house, the user manipulates the robot and plays a simple game. The robot uses Wi-Fi to communicate with the home server. Furthermore, if the home server is not working, the robot comes to the backup server for safety and security. Therefore, we have developed a high-utilization of home robot.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125779356","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5670320
Cen Zhaohui, Wei Jiao-long, Jiang Rui
This paper presents a fault diagnosis (FD) scheme for a class of nonlinear dynamic systems using a novel Grey-Box Neural Network Model (GBNNM). In this GBNNM, a composite structure, including MLP (multi-layer perception) NN (Neural Network) and integer term, is proposed to approximate both nonlinearity and dynamics of object system. Its approximation ability is then proved theoretically. And a self-defined exciting strategy is introduced into NN training to improve NN's generalization ability. Unlike previous NN model based fault diagnosis methods, a quantitative residual, which is obtained from system output and its GBNNM model output, can accurately indicates inconsistency caused by fault, so the improved residual is not essential for our scheme. The proposed FD scheme is applied in a high-fidelity Reaction Wheel (RW) in Satellite Attitude Control System (SACS) in our case study. The results of the case study demonstrate the effectiveness and superiority of our FD scheme.
{"title":"Fault diagnosis based on Grey-box Neural Network identification model","authors":"Cen Zhaohui, Wei Jiao-long, Jiang Rui","doi":"10.1109/ICCAS.2010.5670320","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5670320","url":null,"abstract":"This paper presents a fault diagnosis (FD) scheme for a class of nonlinear dynamic systems using a novel Grey-Box Neural Network Model (GBNNM). In this GBNNM, a composite structure, including MLP (multi-layer perception) NN (Neural Network) and integer term, is proposed to approximate both nonlinearity and dynamics of object system. Its approximation ability is then proved theoretically. And a self-defined exciting strategy is introduced into NN training to improve NN's generalization ability. Unlike previous NN model based fault diagnosis methods, a quantitative residual, which is obtained from system output and its GBNNM model output, can accurately indicates inconsistency caused by fault, so the improved residual is not essential for our scheme. The proposed FD scheme is applied in a high-fidelity Reaction Wheel (RW) in Satellite Attitude Control System (SACS) in our case study. The results of the case study demonstrate the effectiveness and superiority of our FD scheme.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125066627","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669799
E. Jang, Young-Jo Cho, S. Chi, Jaeyeon Lee, S. Kang, B. Chun
In order to assist the lower limb disabled people to walk, walking-support exoskeletons with bio/kinesthetic sensors such as EMG (Electromyography), gyroscope, and FSR (Force Sensing Resistor) have been developed. It is important to implicitly recognize the walking intention and control the walking-support mechanism. The objective of this work is to examine the walking intention while a person is walking with Lofstrand crutches by analyzing multiple bio/kinesthetic sensor signals. We developed watch/glove and shoe-insoles sensor modules using FSR sensors to recognize the user's walking states as well as intention to walk. The FSR signals measuring force at the palm and Gyro sensor signals reflecting the pose of the upper limb were used as clues for recognizing walking intention. While seventeen normal subjects walked for five gate cycles based on the triped walking (i.e., placing crutches in forward and then moving one step) with crutches, the FSR and Gyro signals were acquired from their palms and area of vertebrae lumbales. The result showed that the combination of FSR and Gyro signals could recognize user's implicit intention to walk - start walking, keep walking, and stop walking.
{"title":"Recognition of walking intention using multiple bio/kinesthetic sensors for lower limb exoskeletons","authors":"E. Jang, Young-Jo Cho, S. Chi, Jaeyeon Lee, S. Kang, B. Chun","doi":"10.1109/ICCAS.2010.5669799","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669799","url":null,"abstract":"In order to assist the lower limb disabled people to walk, walking-support exoskeletons with bio/kinesthetic sensors such as EMG (Electromyography), gyroscope, and FSR (Force Sensing Resistor) have been developed. It is important to implicitly recognize the walking intention and control the walking-support mechanism. The objective of this work is to examine the walking intention while a person is walking with Lofstrand crutches by analyzing multiple bio/kinesthetic sensor signals. We developed watch/glove and shoe-insoles sensor modules using FSR sensors to recognize the user's walking states as well as intention to walk. The FSR signals measuring force at the palm and Gyro sensor signals reflecting the pose of the upper limb were used as clues for recognizing walking intention. While seventeen normal subjects walked for five gate cycles based on the triped walking (i.e., placing crutches in forward and then moving one step) with crutches, the FSR and Gyro signals were acquired from their palms and area of vertebrae lumbales. The result showed that the combination of FSR and Gyro signals could recognize user's implicit intention to walk - start walking, keep walking, and stop walking.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128746690","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 : 2010-12-17DOI: 10.1109/ICCAS.2010.5669763
Min-Shik Seok, Il-Seuk Song, S. Jin, J. Jeon
This paper proposes a window-based image processing architecture that minimizes data activities. This architecture has a mapping structure between the line buffer and the window buffer. Each buffer handler writes or reads pixel data in one direction. This feature allows the designer to use a FIFO memory, as well as dual port random memory in the proposed architecture. Thus, the designer can select buffer types as per design efforts. We use this architecture to implement a dynamic threshold circuit. In order to meet time constrains, the output is processed by the pipeline method to meet time constraints. The pipeline method incurs output latency. The Sync Generator module is added to the implemented circuit to synchronize processed image information. Experiments show the logic quality of the circuit implemented circuit using the proposed architecture.
{"title":"A real-time window-based image processing architecture using a mapping table","authors":"Min-Shik Seok, Il-Seuk Song, S. Jin, J. Jeon","doi":"10.1109/ICCAS.2010.5669763","DOIUrl":"https://doi.org/10.1109/ICCAS.2010.5669763","url":null,"abstract":"This paper proposes a window-based image processing architecture that minimizes data activities. This architecture has a mapping structure between the line buffer and the window buffer. Each buffer handler writes or reads pixel data in one direction. This feature allows the designer to use a FIFO memory, as well as dual port random memory in the proposed architecture. Thus, the designer can select buffer types as per design efforts. We use this architecture to implement a dynamic threshold circuit. In order to meet time constrains, the output is processed by the pipeline method to meet time constraints. The pipeline method incurs output latency. The Sync Generator module is added to the implemented circuit to synchronize processed image information. Experiments show the logic quality of the circuit implemented circuit using the proposed architecture.","PeriodicalId":158687,"journal":{"name":"ICCAS 2010","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128296058","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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