Pub Date : 2010-12-01DOI: 10.1109/TENCON.2010.5686682
R. Joseph, S. Nakao, T. Fukusako
The design and experimental investigation of a circularly polarized antenna with circular slot for broadband characteristics is proposed. The horizontal and vertical probes of the L-shaped probe, which is a key element to generate circular polarization, are separated in the structure, contrary to the concept of having joined probes. Another novelty of placing stubs in the slot, which are attached to the ground plane, is proposed to improve the axial ratio (AR) characteristics of the antenna by around 10%. Unidirectional patterns can be obtained by having a cavity of height Ig/4 behind the antenna and is effective when no stubs are placed in the slot.
{"title":"Broadband circularly polarized cavity-backed antenna","authors":"R. Joseph, S. Nakao, T. Fukusako","doi":"10.1109/TENCON.2010.5686682","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686682","url":null,"abstract":"The design and experimental investigation of a circularly polarized antenna with circular slot for broadband characteristics is proposed. The horizontal and vertical probes of the L-shaped probe, which is a key element to generate circular polarization, are separated in the structure, contrary to the concept of having joined probes. Another novelty of placing stubs in the slot, which are attached to the ground plane, is proposed to improve the axial ratio (AR) characteristics of the antenna by around 10%. Unidirectional patterns can be obtained by having a cavity of height Ig/4 behind the antenna and is effective when no stubs are placed in the slot.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121486712","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686688
T. Nomura, Tatsuya Urakawa, Y. Korenaga, D. Yamashita, Hidefumi Matsuzaki, K. Koga, M. Shiratani, Y. Setsuhara, M. Sekine, M. Hori
To control deposition profile of carbon films in trenches, we have studied substrate temperature dependence of deposition rate of carbon films and we have realized anisotropic deposition of carbon films in trenches above 250° deposited by CVD plasma of toluene diluted H2, in trenches. Here, we report dependence of properties of plasma CVD carbon films on substrate temperature.
{"title":"Substrate temperature dependence of feature profile of carbon films on substrate with submicron trenches","authors":"T. Nomura, Tatsuya Urakawa, Y. Korenaga, D. Yamashita, Hidefumi Matsuzaki, K. Koga, M. Shiratani, Y. Setsuhara, M. Sekine, M. Hori","doi":"10.1109/TENCON.2010.5686688","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686688","url":null,"abstract":"To control deposition profile of carbon films in trenches, we have studied substrate temperature dependence of deposition rate of carbon films and we have realized anisotropic deposition of carbon films in trenches above 250° deposited by CVD plasma of toluene diluted H2, in trenches. Here, we report dependence of properties of plasma CVD carbon films on substrate temperature.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116942077","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686034
K. Inoue, K. Hara, K. Urahama
We propose a method for removing rows and columns in an image by clustering the sets of rows and columns separately. We also propose a method for adding rows and columns to an image on the basis of the proposed row/column removal method. Experimental results show that the proposed methods can reduce or enlarge the sizes of given images, while the aspect ratios of the main objects in the images are preserved.
{"title":"Image resizing by row/column removal and addition based on hierarchical clustering","authors":"K. Inoue, K. Hara, K. Urahama","doi":"10.1109/TENCON.2010.5686034","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686034","url":null,"abstract":"We propose a method for removing rows and columns in an image by clustering the sets of rows and columns separately. We also propose a method for adding rows and columns to an image on the basis of the proposed row/column removal method. Experimental results show that the proposed methods can reduce or enlarge the sizes of given images, while the aspect ratios of the main objects in the images are preserved.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123593680","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686413
N. Narita, Terumitsu Tanaka, A. Kato, K. Matsuyama, Y. Nozaki
Magnetic resonance properties for ECC nano-pillar were numerically analyzed. The analysis showed there are three resonance modes in the ECC nano-pillar that ferromagnetic resonances (FMR) at the low and high frequency regions associating with the soft and hard material, and magnetic spin wave resonance at middle frequency region. Microwave assisted magnetization reversals were also simulated assuming ECC nano-pillar with extremely high anisotropy field hard magnetic material. Essential ac field strength and microwave frequency for magnetization reversal were found to be less dependent on anisotropy field for the hard magnetic material, when magnetization reversal is induced by magnetic resonance for the soft magnetic material.
{"title":"Dependence of magnetization switching property with microwave assistance on anisotropy field for ECC nano-pillar","authors":"N. Narita, Terumitsu Tanaka, A. Kato, K. Matsuyama, Y. Nozaki","doi":"10.1109/TENCON.2010.5686413","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686413","url":null,"abstract":"Magnetic resonance properties for ECC nano-pillar were numerically analyzed. The analysis showed there are three resonance modes in the ECC nano-pillar that ferromagnetic resonances (FMR) at the low and high frequency regions associating with the soft and hard material, and magnetic spin wave resonance at middle frequency region. Microwave assisted magnetization reversals were also simulated assuming ECC nano-pillar with extremely high anisotropy field hard magnetic material. Essential ac field strength and microwave frequency for magnetization reversal were found to be less dependent on anisotropy field for the hard magnetic material, when magnetization reversal is induced by magnetic resonance for the soft magnetic material.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"316 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116510997","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 high-throughput multiple-input multiple-output (MIMO) signal detector based on the sort-free concept and the proposed mean-aided early-pruned scheme. The derived MIMO detector can reduce the number of node computation while maintaining the bit error rate (BER) performance of the conventional sort-free MIMO detection algorithm. Experimental results show that the proposed detector design with 4×4 antenna array and 16-QAM modulation has better normalized throughput rate compared to those of existing detectors under the same system configurations. Moreover, a significant reduction on node extensions can be achieved using the presented detection scheme compared with the conventional sort-free algorithm and the K-best algorithm.
{"title":"Design of high-throughput MIMO detectors using sort-free and early-pruned techniques","authors":"Jing-Shiun Lin, Shih-Hao Fang, Yi-Hsuan Jen, Ming-Der Shieh","doi":"10.1109/TENCON.2010.5686145","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686145","url":null,"abstract":"This paper presents a high-throughput multiple-input multiple-output (MIMO) signal detector based on the sort-free concept and the proposed mean-aided early-pruned scheme. The derived MIMO detector can reduce the number of node computation while maintaining the bit error rate (BER) performance of the conventional sort-free MIMO detection algorithm. Experimental results show that the proposed detector design with 4×4 antenna array and 16-QAM modulation has better normalized throughput rate compared to those of existing detectors under the same system configurations. Moreover, a significant reduction on node extensions can be achieved using the presented detection scheme compared with the conventional sort-free algorithm and the K-best algorithm.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130392804","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5685918
Kazuhide Dougome, K. Araki
We have developed a method and a suit of software tools which can transform a set of message sequence charts into the state transition diagrams and the executable programs for the involved objects. The basis of our method is a regular expression over a set of actions, named the regular trace. In this paper, we define the regular trace at first, and then discuss the method for producing a concrete program from the regular trace. For this purpose, we utilized the generalized finite automaton as an intermediate representation of the object, and applied some well-known algorithms in the formal language theory. At last, we report the outline of our software tools and its application example.
{"title":"Synthesizing state-based objects from a regular set of action sequences","authors":"Kazuhide Dougome, K. Araki","doi":"10.1109/TENCON.2010.5685918","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5685918","url":null,"abstract":"We have developed a method and a suit of software tools which can transform a set of message sequence charts into the state transition diagrams and the executable programs for the involved objects. The basis of our method is a regular expression over a set of actions, named the regular trace. In this paper, we define the regular trace at first, and then discuss the method for producing a concrete program from the regular trace. For this purpose, we utilized the generalized finite automaton as an intermediate representation of the object, and applied some well-known algorithms in the formal language theory. At last, we report the outline of our software tools and its application example.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132431522","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686064
Tomohisa Masmima, Y. Chisaki, T. Usagawa
An utterance training system utilizing automatic speech recognition (ASR) has been developed as a computer aided language laboratory system. Because the performance of ASR is seriously degraded due to surround noise, many noise reduction methods has been proposed. In particular, in utterance training system, learners often sit side by side in a classroom so that each learner's utterances degrade other learners utterances. Spectral subtraction, one of the noise reduction methods, suppresses stationary noise from a signal by subtracting a noise spectrum estimated by observed signal without voice activity. However, it relies on the assumption that the noise is stationary. Even though multi-channel methods such as Delay and Sum, Griffiths-Jim or various Blind Source Separation methods are applicable for non stationary noise, these methods build under synchronization of all input signals. In this paper, a time-frequency masking method utilizing signals observed at distributed computers connected over TCP/IP network is proposed. Because the characteristics of TCP/IP based network, various transmission delays are unavoidable so that signals from computers cannot synchronize perfectly even when a time synching protocol such as the Network Time Protocol is utilized. The proposed method is based on the assumption that the noise spectrum is stable for certain duration. From this assumption, the asynchronous signals observed at distributed computers are utilized for speech enhancement based on time-frequency masking. Simulation results show a possibility to improve the performance of ASR when several interference speakers exist around the target speaker.
{"title":"Speech enhancement method based on spectral filtering utilizing asynchronous signals with embedded timecode over TCP/IP based network","authors":"Tomohisa Masmima, Y. Chisaki, T. Usagawa","doi":"10.1109/TENCON.2010.5686064","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686064","url":null,"abstract":"An utterance training system utilizing automatic speech recognition (ASR) has been developed as a computer aided language laboratory system. Because the performance of ASR is seriously degraded due to surround noise, many noise reduction methods has been proposed. In particular, in utterance training system, learners often sit side by side in a classroom so that each learner's utterances degrade other learners utterances. Spectral subtraction, one of the noise reduction methods, suppresses stationary noise from a signal by subtracting a noise spectrum estimated by observed signal without voice activity. However, it relies on the assumption that the noise is stationary. Even though multi-channel methods such as Delay and Sum, Griffiths-Jim or various Blind Source Separation methods are applicable for non stationary noise, these methods build under synchronization of all input signals. In this paper, a time-frequency masking method utilizing signals observed at distributed computers connected over TCP/IP network is proposed. Because the characteristics of TCP/IP based network, various transmission delays are unavoidable so that signals from computers cannot synchronize perfectly even when a time synching protocol such as the Network Time Protocol is utilized. The proposed method is based on the assumption that the noise spectrum is stable for certain duration. From this assumption, the asynchronous signals observed at distributed computers are utilized for speech enhancement based on time-frequency masking. Simulation results show a possibility to improve the performance of ASR when several interference speakers exist around the target speaker.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126058213","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686572
M. Nishimoto, Kousuke Tomura
This study proposes inverse filtering operation for reconstruction of ground penetrating radar (GPR) responses in order to remove waveform distortion caused by transmitting and receiving antenna characteristics. As an example, we apply it to measured pulse response from a metallic sphere and show the effectiveness of the method.
{"title":"Inverse filtering operation for reconstruction of distorted GPR response","authors":"M. Nishimoto, Kousuke Tomura","doi":"10.1109/TENCON.2010.5686572","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686572","url":null,"abstract":"This study proposes inverse filtering operation for reconstruction of ground penetrating radar (GPR) responses in order to remove waveform distortion caused by transmitting and receiving antenna characteristics. As an example, we apply it to measured pulse response from a metallic sphere and show the effectiveness of the method.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129637894","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5685896
S. Abe, T. Zaitsu, S. Obata, M. Ogawa, M. Shoyama, T. Ninomiya
Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters is very difficult. This paper proposes the interesting control technique which is cancelled the transfer function of the converter by using pole-zero-cancellation method. This technique is very simple and easy to stability design.
{"title":"Dynamic characteristics of digitally controled conveter with pole-zero-cancellation techique","authors":"S. Abe, T. Zaitsu, S. Obata, M. Ogawa, M. Shoyama, T. Ninomiya","doi":"10.1109/TENCON.2010.5685896","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5685896","url":null,"abstract":"Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters is very difficult. This paper proposes the interesting control technique which is cancelled the transfer function of the converter by using pole-zero-cancellation method. This technique is very simple and easy to stability design.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130435296","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 : 2010-12-01DOI: 10.1109/TENCON.2010.5686640
Y. Martin, Zhenyu Li, T. Tsutsumi, J. Suehiro, K. Imasaka, S. Ohtsuka
It is important to detect decomposition of insulating gas SF6 caused by partial discharges for gas-insulated switchgear (GIS). In the previous result, the author developed a novel partial discharges sensing using carbon nanotube (CNT) gas sensor. In recently, an application of high voltage DC for long distance electric power transmission has been often used in various countries as the interconnection system and overload demand. In this study we applied the CNT gas sensor to detect partial discharges generated by high voltage DC. There was polarity profile for DC compared AC discharges. It was found, response of the sensor in the case of negative discharges was much higher than positive discharges under the same experimental condition. And the decomposed gases for each case were identified by FT-IR spectroscopy. The result indicated absorption peaks correspond to SF4 and SOF2 of positive discharges was much higher than that of negative discharges.
{"title":"Identification of DC corona generating SF6 decomposition gases adsorbed on CNT gas sensor using FTIR spectroscopy","authors":"Y. Martin, Zhenyu Li, T. Tsutsumi, J. Suehiro, K. Imasaka, S. Ohtsuka","doi":"10.1109/TENCON.2010.5686640","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686640","url":null,"abstract":"It is important to detect decomposition of insulating gas SF6 caused by partial discharges for gas-insulated switchgear (GIS). In the previous result, the author developed a novel partial discharges sensing using carbon nanotube (CNT) gas sensor. In recently, an application of high voltage DC for long distance electric power transmission has been often used in various countries as the interconnection system and overload demand. In this study we applied the CNT gas sensor to detect partial discharges generated by high voltage DC. There was polarity profile for DC compared AC discharges. It was found, response of the sensor in the case of negative discharges was much higher than positive discharges under the same experimental condition. And the decomposed gases for each case were identified by FT-IR spectroscopy. The result indicated absorption peaks correspond to SF4 and SOF2 of positive discharges was much higher than that of negative discharges.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127239380","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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