Pub Date : 2010-11-01DOI: 10.1109/TENCON.2010.5686151
I. Tseng, Che-I Lee, Huan-Wen Chen
Partitioning parameterized polygons is an essential process in a proposed layout-aware analog integrated circuit design flow. To deal with constraints associated with parameterized polygons, constraint programming (CP) technologies have been used in a previous partitioning algorithm. Although CP solvers are capable of coping with complex constraints, CP-based partitioning processes can be very time-consuming. In this paper, we propose the use of mixed integer linear programming (MILP) solvers in the partitioning of parameterized 45-degree polygons. Experimental results show that more than 150X speedup can be achieved for partitioning parameterized polygons containing very complex constraints.
{"title":"Efficient partitioning of parameterized 45-degree polygons with mixed ILP","authors":"I. Tseng, Che-I Lee, Huan-Wen Chen","doi":"10.1109/TENCON.2010.5686151","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686151","url":null,"abstract":"Partitioning parameterized polygons is an essential process in a proposed layout-aware analog integrated circuit design flow. To deal with constraints associated with parameterized polygons, constraint programming (CP) technologies have been used in a previous partitioning algorithm. Although CP solvers are capable of coping with complex constraints, CP-based partitioning processes can be very time-consuming. In this paper, we propose the use of mixed integer linear programming (MILP) solvers in the partitioning of parameterized 45-degree polygons. Experimental results show that more than 150X speedup can be achieved for partitioning parameterized polygons containing very complex constraints.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128770949","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5685997
A. Jammulamadaka, A. G. Mark
VoIP is becoming the dominant approach for telephony and its growth will continue with the upcoming introduction of 4G mobile wireless and fibre to the home networks. With the growing demand for VoIP and increased VoIP traffic, it is important to implement a system that provides interoperability between the existing telephony numbering system and the IP network device addresses. Infrastructure ENUM is one approach that may be used as it paves the path for Service Providers to leverage the use of DNS and globally used E164 numbers to simplify the way we communicate. This paper examines the Infrastructure ENUM implementation in Australia
{"title":"Infrastructure ENUM implementation in Australia","authors":"A. Jammulamadaka, A. G. Mark","doi":"10.1109/TENCON.2010.5685997","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5685997","url":null,"abstract":"VoIP is becoming the dominant approach for telephony and its growth will continue with the upcoming introduction of 4G mobile wireless and fibre to the home networks. With the growing demand for VoIP and increased VoIP traffic, it is important to implement a system that provides interoperability between the existing telephony numbering system and the IP network device addresses. Infrastructure ENUM is one approach that may be used as it paves the path for Service Providers to leverage the use of DNS and globally used E164 numbers to simplify the way we communicate. This paper examines the Infrastructure ENUM implementation in Australia","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128662661","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686658
I-Jan Wang, Lun-De Liao, Yu-Te Wang, Chi-Yu Chen, B. Lin, Shao-Wei Lu, Chin-Teng Lin
A Wearable Mobile Electrocardiogram Monitoring System (WMEMS), which mainly consists of a wearable Electrocardiogram (ECG) acquisition device, a mobile phone with global positioning system, and a healthcare server, was developed in this study. Most of telemedicine systems for long-term ECG monitoring focus on the application of communication techniques. However, how to monitor long-term ECG state more comfortably in daily life is also an important issue. In this study, a novel dry foam electrode was designed and applied for the wearable ECG acquisition device in our WMEMS. These novel dry foam electrodes without conduction gels can provide good conductivity to acquire ECG signal effectively, and can adapt to irregular skin surface to maintain low skin-electrode impedance and reduce motion artifacts under movement. Therefore, the wearable ECG acquisition device is suitable for long-term ECG monitoring in daily life. Moreover, by combining with wireless communication technique, our WMEMS can monitor patient's heart rate continuously anywhere in the globe if they are under the coverage of GSM cellular network. Experiment results showed that our WMEMS really provides a good system prototype for ECG telemedicine applications.
{"title":"A Wearable Mobile Electrocardiogram measurement device with novel dry polymer-based electrodes","authors":"I-Jan Wang, Lun-De Liao, Yu-Te Wang, Chi-Yu Chen, B. Lin, Shao-Wei Lu, Chin-Teng Lin","doi":"10.1109/TENCON.2010.5686658","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686658","url":null,"abstract":"A Wearable Mobile Electrocardiogram Monitoring System (WMEMS), which mainly consists of a wearable Electrocardiogram (ECG) acquisition device, a mobile phone with global positioning system, and a healthcare server, was developed in this study. Most of telemedicine systems for long-term ECG monitoring focus on the application of communication techniques. However, how to monitor long-term ECG state more comfortably in daily life is also an important issue. In this study, a novel dry foam electrode was designed and applied for the wearable ECG acquisition device in our WMEMS. These novel dry foam electrodes without conduction gels can provide good conductivity to acquire ECG signal effectively, and can adapt to irregular skin surface to maintain low skin-electrode impedance and reduce motion artifacts under movement. Therefore, the wearable ECG acquisition device is suitable for long-term ECG monitoring in daily life. Moreover, by combining with wireless communication technique, our WMEMS can monitor patient's heart rate continuously anywhere in the globe if they are under the coverage of GSM cellular network. Experiment results showed that our WMEMS really provides a good system prototype for ECG telemedicine applications.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128736291","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686765
L. Hakim, J. Kubokawa, Yue Yuan, R. S. Wibowo, T. Takayama, N. Yorino, Y. Zoka, Y. Sasaki, Yusra Sabri
In the recently deregulated electricity market, a more secure of power system operation is essential. One of the methods to avoid the risk of compromising power system instability is preventive control which often comes in the form of generation rescheduling. This paper attempts to solve transient stability preventive control problem by generation redispatch utilizing the Primal-Dual Interior Point Method (PDIPM) Non Linear Programming (NLP) Transient Stability Constrained Optimal Power Flow (TSCOPF). A linear cost model is derived to accommodate generation redispatch. Our simulation shows that the proposed method is able to solve the transient stability preventive control problem by rescheduling necessary active power generation.
{"title":"A solution of preventive control by means of Transient Stability Constrained OPF","authors":"L. Hakim, J. Kubokawa, Yue Yuan, R. S. Wibowo, T. Takayama, N. Yorino, Y. Zoka, Y. Sasaki, Yusra Sabri","doi":"10.1109/TENCON.2010.5686765","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686765","url":null,"abstract":"In the recently deregulated electricity market, a more secure of power system operation is essential. One of the methods to avoid the risk of compromising power system instability is preventive control which often comes in the form of generation rescheduling. This paper attempts to solve transient stability preventive control problem by generation redispatch utilizing the Primal-Dual Interior Point Method (PDIPM) Non Linear Programming (NLP) Transient Stability Constrained Optimal Power Flow (TSCOPF). A linear cost model is derived to accommodate generation redispatch. Our simulation shows that the proposed method is able to solve the transient stability preventive control problem by rescheduling necessary active power generation.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129153338","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5685919
M. Kawano, Y. Hirata, Y. Arima
We developed a 106 dB wide dynamic range binocular three-dimensional (3D) range sensor LSI. The developed LSI chip was produced using a process of 0.35 µm Complementary Metal Oxide Semiconductor (CMOS) 1-poly 3-metal and has a die size of 4.20 × 3.57 mm2. The chip uses a 3.0 V supply voltage and has a power consumption of 375 mW at a clock frequency of 10 MHz. The sensor has two image sensors and all the correlation circuits integrated on a single chip and its operation is based on stereo vision. We have previously developed a 3D range sensor LSI. However, this sensor uses a typical CMOS image sensor and was unable to simultaneously detect objects with an extreme brightness difference. Thus, the use of such sensors in an outdoor environment is difficult. The newly developed 3D range sensor LSI uses a pixel circuit with an expandable dynamic range. As a result, it became possible to simultaneously detect the 3D position of objects outdoors with different light conditions.
{"title":"A three-dimensional binocular range sensor LSI with a 106 dB wide dynamic range pixel","authors":"M. Kawano, Y. Hirata, Y. Arima","doi":"10.1109/TENCON.2010.5685919","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5685919","url":null,"abstract":"We developed a 106 dB wide dynamic range binocular three-dimensional (3D) range sensor LSI. The developed LSI chip was produced using a process of 0.35 µm Complementary Metal Oxide Semiconductor (CMOS) 1-poly 3-metal and has a die size of 4.20 × 3.57 mm2. The chip uses a 3.0 V supply voltage and has a power consumption of 375 mW at a clock frequency of 10 MHz. The sensor has two image sensors and all the correlation circuits integrated on a single chip and its operation is based on stereo vision. We have previously developed a 3D range sensor LSI. However, this sensor uses a typical CMOS image sensor and was unable to simultaneously detect objects with an extreme brightness difference. Thus, the use of such sensors in an outdoor environment is difficult. The newly developed 3D range sensor LSI uses a pixel circuit with an expandable dynamic range. As a result, it became possible to simultaneously detect the 3D position of objects outdoors with different light conditions.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124667419","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686149
Yiping Dong, Zhen Lin, Takahiro Watanabe
Networks on Chip (NoC) has been widely discussed for its smart structure and high performance. Routing algorithms significantly influence design cost and system performance of NoC. In this paper, a new hardware method called FinalDestination-Tag (FDT) is proposed to improve the original Destination-Tag (DT) method for implementing different routing algorithms. Compared with the DT method, the proposed FDT method could reduce the header size of the packet. We evaluate NoC with this proposed method in terms of circuit resource, average latency, max latency, average throughput and power consumption. The results indicate that the proposed method is effective in increasing throughput and reducing circuit resource, latency and power consumption for NoC.
{"title":"An efficient hardware routing algorithms for NoC","authors":"Yiping Dong, Zhen Lin, Takahiro Watanabe","doi":"10.1109/TENCON.2010.5686149","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686149","url":null,"abstract":"Networks on Chip (NoC) has been widely discussed for its smart structure and high performance. Routing algorithms significantly influence design cost and system performance of NoC. In this paper, a new hardware method called FinalDestination-Tag (FDT) is proposed to improve the original Destination-Tag (DT) method for implementing different routing algorithms. Compared with the DT method, the proposed FDT method could reduce the header size of the packet. We evaluate NoC with this proposed method in terms of circuit resource, average latency, max latency, average throughput and power consumption. The results indicate that the proposed method is effective in increasing throughput and reducing circuit resource, latency and power consumption for NoC.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127045824","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686426
A. Suzuki, S. Oikawa
In these days, the performance gain of hardware promotes the use of Virtual Machine Monitors (VMMs) even in embedded systems. By using VMMs, we can overcome many of the issues in embedded systems. We call it SIVARM: a simple VMM for the ARM architecture. Therefore, we implemented a VMM for the ARM architecture that is the most widely used CPU for embedded systems. Since the VMM executes in privileged mode and its guest OS executes in non-privileged mode, the VMM can catch the execution of sensitive instructions as exceptions and emulate them appropriately. The guest OS can execute in non-privileged mode thanks to the virtual banked registers and the virtual processor mode provided by the VMM. Domains are used to for the access control between the guest OS and the VMM. The VMM was implemented for the ARM926EJ-S processor, and can successfully boot the Linux on it.
{"title":"SIVARM: A Virtual Machine Monitor for the ARM architecture","authors":"A. Suzuki, S. Oikawa","doi":"10.1109/TENCON.2010.5686426","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686426","url":null,"abstract":"In these days, the performance gain of hardware promotes the use of Virtual Machine Monitors (VMMs) even in embedded systems. By using VMMs, we can overcome many of the issues in embedded systems. We call it SIVARM: a simple VMM for the ARM architecture. Therefore, we implemented a VMM for the ARM architecture that is the most widely used CPU for embedded systems. Since the VMM executes in privileged mode and its guest OS executes in non-privileged mode, the VMM can catch the execution of sensitive instructions as exceptions and emulate them appropriately. The guest OS can execute in non-privileged mode thanks to the virtual banked registers and the virtual processor mode provided by the VMM. Domains are used to for the access control between the guest OS and the VMM. The VMM was implemented for the ARM926EJ-S processor, and can successfully boot the Linux on it.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123378808","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686744
N. Yorino, H. Hafiz, Y. Sasaki, Y. Zoka
The role of economic load dispatch is increasing in the future power system, making best use of the ramp rate capability of thermal generating units to follow rapid and large disturbances due to the large amount of renewable energy penetration. This paper proposes a dynamic economic load dispatch method using the generator's feasible operation region approach. It is a region within which generating units may change their outputs in order to match a demand profile while satisfying ramp-rate and supply-demand balance constraint. The method can specify the amount of reserve required to maintain a feasible operation for restrictive demand profile which cannot be served due to generating unit's capability. The proposed method has been successfully tested on a 3 generator system supplying a typical afternoon demand profile.
{"title":"Feasible operation region for dynamic economic load dispatch","authors":"N. Yorino, H. Hafiz, Y. Sasaki, Y. Zoka","doi":"10.1109/TENCON.2010.5686744","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686744","url":null,"abstract":"The role of economic load dispatch is increasing in the future power system, making best use of the ramp rate capability of thermal generating units to follow rapid and large disturbances due to the large amount of renewable energy penetration. This paper proposes a dynamic economic load dispatch method using the generator's feasible operation region approach. It is a region within which generating units may change their outputs in order to match a demand profile while satisfying ramp-rate and supply-demand balance constraint. The method can specify the amount of reserve required to maintain a feasible operation for restrictive demand profile which cannot be served due to generating unit's capability. The proposed method has been successfully tested on a 3 generator system supplying a typical afternoon demand profile.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123626149","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686157
Lou Jiana, Wu Xiobo
An integrated lossless inductor current-sensing method is proposed. Its core is the using of a Gm-C filter, whose frequency response matches the inductor time-constant. In order to fit different types and values of inductors, tuning and calibration process is introduced in for self-matching ahead of normal loop control. For applying the proposed method to a 4-switch buck-boost converter, some special issues like high ICMR, transconductance programmability, and high output resistant were carefully considered and treated. Based on it, the propose circuit is designed and fabricated with TSMC 0.35-µm CMOS technology successfully. The experimental results are consistent with expectations well.
{"title":"An improved integrated lossless self-matched current-sensing circuit based on Gm-C filter for 4-switch buck-boost topology","authors":"Lou Jiana, Wu Xiobo","doi":"10.1109/TENCON.2010.5686157","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686157","url":null,"abstract":"An integrated lossless inductor current-sensing method is proposed. Its core is the using of a Gm-C filter, whose frequency response matches the inductor time-constant. In order to fit different types and values of inductors, tuning and calibration process is introduced in for self-matching ahead of normal loop control. For applying the proposed method to a 4-switch buck-boost converter, some special issues like high ICMR, transconductance programmability, and high output resistant were carefully considered and treated. Based on it, the propose circuit is designed and fabricated with TSMC 0.35-µm CMOS technology successfully. The experimental results are consistent with expectations well.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123723614","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 : 2010-11-01DOI: 10.1109/TENCON.2010.5686548
S. Ohta, K. Toyoshima, H. Uematsu, K. Hisadome, M. Teshima
Time synchronization protocols, such as NTP (Network Time Protocol), are frequently used on IP (Internet protocol) networks. These protocols estimate the clock time offset by measuring the Round Trip Time (RTT). In this estimation, errors may occur by delay variation, which is included in the measured RTT values. To avoid this, a conventional minimum filter technique using a fixed sample size has been developed previously. For the conventional filter to work efficiently, it is necessary to select the appropriate number of samples from which the minimum value is selected, while considering the tradeoff between the filtering effect and synchronization stability. This paper investigates an alternate filter, called an adaptive minimum filter, which controls the number of samples depending on the variation of the RTT values. This filter achieves a sufficient filtering effect as well as superior clock control stability. A computer simulation is used to evaluate the time synchronization protocol that employs the adaptive minimum filter. The simulation results show that the synchronization protocol with the adaptive minimum filter achieves better time accuracy and stability than that with the conventional minimum filter.
时间同步协议，如NTP (Network Time Protocol)，是IP (Internet Protocol)网络中常用的时间同步协议。这些协议通过测量往返时间(RTT)来估计时钟时间偏移。在这种估计中，延迟变化可能会产生误差，延迟变化包含在测量的RTT值中。为了避免这种情况，以前已经开发了使用固定样本量的传统最小过滤技术。为了使传统滤波器有效地工作，需要选择合适数量的样本来选择最小值，同时考虑滤波效果和同步稳定性之间的权衡。本文研究了一种替代滤波器，称为自适应最小滤波器，它根据RTT值的变化来控制样本数量。该滤波器达到了足够的滤波效果以及优越的时钟控制稳定性。利用计算机仿真对采用自适应最小滤波器的时间同步协议进行了评价。仿真结果表明，采用自适应最小滤波器的同步协议比采用传统最小滤波器的同步协议具有更好的时间精度和稳定性。
{"title":"Adaptive minimum filter that achieves precise time synchronization on IP networks","authors":"S. Ohta, K. Toyoshima, H. Uematsu, K. Hisadome, M. Teshima","doi":"10.1109/TENCON.2010.5686548","DOIUrl":"https://doi.org/10.1109/TENCON.2010.5686548","url":null,"abstract":"Time synchronization protocols, such as NTP (Network Time Protocol), are frequently used on IP (Internet protocol) networks. These protocols estimate the clock time offset by measuring the Round Trip Time (RTT). In this estimation, errors may occur by delay variation, which is included in the measured RTT values. To avoid this, a conventional minimum filter technique using a fixed sample size has been developed previously. For the conventional filter to work efficiently, it is necessary to select the appropriate number of samples from which the minimum value is selected, while considering the tradeoff between the filtering effect and synchronization stability. This paper investigates an alternate filter, called an adaptive minimum filter, which controls the number of samples depending on the variation of the RTT values. This filter achieves a sufficient filtering effect as well as superior clock control stability. A computer simulation is used to evaluate the time synchronization protocol that employs the adaptive minimum filter. The simulation results show that the synchronization protocol with the adaptive minimum filter achieves better time accuracy and stability than that with the conventional minimum filter.","PeriodicalId":101683,"journal":{"name":"TENCON 2010 - 2010 IEEE Region 10 Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127601470","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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