The Experts below are selected from a list of 223599 Experts worldwide ranked by ideXlab platform
Hiromi Okada - One of the best experts on this subject based on the ideXlab platform.
-
ICPP Workshops - Sliding-Typed Communication Range Recognition Method for Indoor Position Estimation in Passive RFID Systems
2011 40th International Conference on Parallel Processing Workshops, 2011Co-Authors: Atsuki Inada, Manato Fujimoto, Tomotaka Wada, Kouichi Mutsuura, Yuki Oda, Emi Nakamori, Hiromi OkadaAbstract:RFID (Radio Frequency Identification) systems have become meaningful as a new identification source that is applicable in ubiquitous environments. Each RFID tag has a unique ID, and is attached to an object. A user reads the unique ID of an RFID tag with RFID readers and obtains the information of the object. One of the most important technologies that use the RFID system is the position estimation of RFID tags. The position estimation means to estimates the location of the object with the RFID tag. It is very useful to acquire the location information of RFID tag. If a user understands the position of the RFID tag, a new navigation system for persons in complex buildings. In this paper, we propose a new method for accurate indoor position estimation of passive RFID systems named as the Sliding-Typed CRR method. In this method, the position of an RFID tag is estimated by using S-CRR (Swift Communication Range Recognition) method. The proposed method is capable of accurate position estimation in any directions of RFID tags.
-
A Novel Communication Range Recognition (CRR) Scheme for Spatial Localization of Passive RFID Tags
IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, 2010Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:RFID (Radio Frequency Identification) technology is expected to be used as a localization tool. By the localization of RFID tags, a mobile robot equipped with an RFID reader can recognize the surrounding environment. In this paper, we propose a novel effective scheme called the Communication Range recognition (CRR) scheme for localizing RFID tags. In this scheme, an RFID reader determines the boundaries of the Communication Range when it is appropriately positioned by the robot. We evaluate the estimated position accuracy through numerous experiments. We show that the moving distance of the RFID reader in the proposed scheme is lower than that in conventional schemes.
-
GLOBECOM - A Novel Method for Position Estimation of Passive RFID Tags; Swift Communication Range Recognition (S-CRR) Method
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010Co-Authors: Manato Fujimoto, Norie Uchitomi, Atsuki Inada, Tomotaka Wada, Kouichi Mutsuura, Hiromi OkadaAbstract:The RFID (Radio Frequency IDentification) system is paid attention to as a new identification source that achieves a ubiquitous environment. Each RFID tag has the unique ID, and is attached to some object. A user reads the unique ID of a RFID tag with RFID readers and obtains the information on the object. One of the most important technologies that use the RFID system is the position estimation of RFID tags. The position estimation means to estimates the location of the object with the RFID tag. It can be very useful to acquire the location information of RFID tag. If a user can understand the position of the RFID tag, the position estimation can be applied to a navigation system for walkers. In this paper, we propose a new method named as Swift Communication Range Recognition (S-CRR) method as an extended improvement of the previous CRR method on the estimation delay. In this method, the position of RFID tag is estimated by selecting the Communication area model which corresponds to those boundary angles. We carry out the performance evaluation by the experiments of RFID system and show the effectiveness of S-CRR for position estimation.
-
A Novel localization scheme for passive RFID tags; Communication Range Recognition (CRR)
2009 IEEE International Conference on RFID, 2009Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:This paper focuses on the localization technology of passive RFID (Radio Frequency IDentification) tags. By this technology, we will be able to detect some target, to get information on it, and to find the position and the distance of it. This paper proposes a novel scheme named Communication Range Recognition (CRR) in order to localize RFID tags effectively. This scheme finds the edges of the Communication Range of the RFID reader antenna when its position is moving by the robot appropriately. We evaluate the performance of the estimated position error through numerous experiments. We show that our proposed scheme can reduce the moving distance of the RFID reader without degrading the accuracy of localization in comparison with the conventional schemes.
-
ICC - A Novel Scheme for Spatial Localization of Passive RFID Tags; Communication Range Recognition (CRR) Scheme
2009 IEEE International Conference on Communications, 2009Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:The RFID (Radio Frequency IDentification) tag is expected to be used as a tool of localization. With the localization of RFID tags, a mobile robot with an installed RFID reader can recognize the surrounding environment. In addition, it can be applied to a navigation system for walkers. In this paper, we propose a new scheme named Communication Range Recognition (CRR) in order to localize RFID tags effectively. In this scheme, the RFID reader finds the edges of the Communication Range when its position is moved appropriately by the robot. We evaluate the performance of the estimated position error through numerous experiments. We show that our proposed scheme can reduce the moving distance of the RFID reader without degrading the accuracy of localization in comparison with the conventional schemes.
Qihuang Gong - One of the best experts on this subject based on the ideXlab platform.
-
Nanoscale on-chip all-optical logic parity checker in integrated plasmonic circuits in optical Communication Range.
Scientific Reports, 2016Co-Authors: Feifan Wang, Hong Yang, Zibo Gong, Xiaoyu Yang, Qihuang GongAbstract:The nanoscale chip-integrated all-optical logic parity checker is an essential core component for optical computing systems and ultrahigh-speed ultrawide-band information processing chips. Unfortunately, little experimental progress has been made in development of these devices to date because of material bottleneck limitations and a lack of effective realization mechanisms. Here, we report a simple and efficient strategy for direct realization of nanoscale chip-integrated all-optical logic parity checkers in integrated plasmonic circuits in the optical Communication Range. The proposed parity checker consists of two-level cascaded exclusive-OR (XOR) logic gates that are realized based on the linear interference of surface plasmon polaritons propagating in the plasmonic waveguides. The parity of the number of logic 1s in the incident four-bit logic signals is determined, and the output signal is given the logic state 0 for even parity (and 1 for odd parity). Compared with previous reports, the overall device feature size is reduced by more than two orders of magnitude, while ultralow energy consumption is maintained. This work raises the possibility of realization of large-scale integrated information processing chips based on integrated plasmonic circuits, and also provides a way to overcome the intrinsic limitations of serious surface plasmon polariton losses for on-chip integration applications.
-
Ultralow-power and ultrafast all-optical tunable PIT in metamaterials at optical Communication Range
CLEO: 2014, 2014Co-Authors: Yu Zhu, Hong Yang, Qihuang GongAbstract:ultralow-power and ultrafast all-optical tunable plasmon-induced transparency have been realized in metamaterials coated on polycrystalline indium-tin oxide layer at the optical Communication Range.
-
ultralow power and ultrafast all optical tunable plasmon induced transparency in metamaterials at optical Communication Range
Scientific Reports, 2013Co-Authors: Xiaoyong Hu, Hong Yang, Yulan Fu, Qihuang GongAbstract:Actively all-optical tunable plasmon-induced transparency in metamaterials paves the way for achieving ultrahigh-speed quantum information processing chips. Unfortunately, up to now, very small experimental progress has been made for all-optical tunable plasmon-induced transparency in metamaterials in the visible and near-infrared Range because of small third-order optical nonlinearity of conventional materials. The achieved operating pump intensity was as high as several GW/cm2 order. Here, we report an ultralow-power and ultrafast all-optical tunable plasmon-induced transparency in metamaterials coated on polycrystalline indium-tin oxide layer at the optical Communication Range. Compared with previous reports, the threshold pump intensity is reduced by four orders of magnitude, while an ultrafast response time of picoseconds order is maintained. This work not only offers a way to constructing photonic materials with large nonlinearity and ultrafast response, but also opens up the possibility for realizing quantum solid chips and ultrafast integrated photonic devices based on metamaterials.
Hamid Jafarkhani - One of the best experts on this subject based on the ideXlab platform.
-
Energy-Efficient Node Deployment in Heterogeneous Two-Tier Wireless Sensor Networks with Limited Communication Range.
IEEE Transactions on Wireless Communications, 2020Co-Authors: Saeed Karimi-bidhendi, Jun Guo, Hamid JafarkhaniAbstract:We study a heterogeneous two-tier wireless sensor network in which N heterogeneous access points (APs) collect sensing data from densely distributed sensors and then forward the data to M heterogeneous fusion centers (FCs). This heterogeneous node deployment problem is modeled as an optimization problem with the total power consumption of the network as its cost function. The necessary conditions of the optimal AP and FC node deployment are explored in this paper. We provide a variation of Voronoi Diagram as the optimal cell partition for this network and show that each AP should be placed between its connected FC and the geometric center of its cell partition. In addition, we propose a heterogeneous two-tier Lloyd algorithm to optimize the node deployment. Furthermore, we study the sensor deployment when the Communication Range is limited for sensors and APs. Simulation results show that our proposed algorithms outperform the existing clustering methods like Minimum Energy Routing, Agglomerative Clustering, Divisive Clustering, Particle Swarm Optimization, Relay Node placement in Double-tiered Wireless Sensor Networks, and Improved Relay Node Placement, on average.
-
Movement-Efficient Sensor Deployment in Wireless Sensor Networks With Limited Communication Range
IEEE Transactions on Wireless Communications, 2019Co-Authors: Jun Guo, Hamid JafarkhaniAbstract:We study a mobile wireless sensor network (MWSN) consisting of multiple mobile sensors or robots. Three key factors in MWSNs, such as sensing quality, energy consumption, and connectivity, have attracted plenty of attention, but the interaction of these factors is not well studied. To take all the three factors into consideration, we model the sensor deployment problem as a constrained optimization problem. Our goal is to find an optimal sensor deployment (or relocation) to optimize the sensing quality with a limited Communication Range and a specific network lifetime constraint. We derive necessary conditions for the optimal sensor deployment in both homogeneous and heterogeneous MWSNs. According to our derivation, some sensors are idle in the optimal deployment of heterogeneous MWSNs. Using these necessary conditions, we design both the centralized and distributed algorithms to provide a flexible and explicit tradeoff between sensing uncertainty and network lifetime. The proposed algorithms are successfully extended to more applications, such as area coverage and target coverage, via properly selected density functions. The simulation results show that our algorithms outperform the existing relocation algorithms.
-
Movement-efficient Sensor Deployment in Wireless Sensor Networks with Limited Communication Range
arXiv: Distributed Parallel and Cluster Computing, 2018Co-Authors: Jun Guo, Hamid JafarkhaniAbstract:We study a mobile wireless sensor network (MWSN) consisting of multiple mobile sensors or robots. Three key factors in MWSNs, sensing quality, energy consumption, and connectivity, have attracted plenty of attention, but the interaction of these factors is not well studied. To take all the three factors into consideration, we model the sensor deployment problem as a constrained source coding problem. %, which can be applied to different coverage tasks, such as area coverage, target coverage, and barrier coverage. Our goal is to find an optimal sensor deployment (or relocation) to optimize the sensing quality with a limited Communication Range and a specific network lifetime constraint. We derive necessary conditions for the optimal sensor deployment in both homogeneous and heterogeneous MWSNs. According to our derivation, some sensors are idle in the optimal deployment of heterogeneous MWSNs. Using these necessary conditions, we design both centralized and distributed algorithms to provide a flexible and explicit trade-off between sensing uncertainty and network lifetime. The proposed algorithms are successfully extended to more applications, such as area coverage and target coverage, via properly selected density functions. Simulation results show that our algorithms outperform the existing relocation algorithms.
-
sensor deployment with limited Communication Range in homogeneous and heterogeneous wireless sensor networks
IEEE Transactions on Wireless Communications, 2016Co-Authors: Jun Guo, Hamid JafarkhaniAbstract:We study the heterogeneous wireless sensor networks (WSNs) and propose the necessary condition of the optimal sensor deployment. Similar to that in homogeneous WSNs, the necessary condition implies that every sensor node location should coincide with the centroid of its own optimal sensing region. Moreover, we discuss the dynamic sensor deployment in both the homogeneous and the heterogeneous WSNs with limited Communication Range for the sensor nodes. The purpose of sensor deployment is to improve sensing performance, reflected by distortion and coverage. We model the sensor deployment problem as a source coding problem with distortion reflecting sensing accuracy. However, when the Communication Range is limited, a WSN is divided into several disconnected sub-graphs under certain conditions as we will discuss in this paper. In such a scenario, neither the conventional distortion nor the coverage represents the sensing performance as the collected data in disconnected sub-graphs cannot be communicated with the access point. By defining an appropriate sensing performance measure, we propose a Restrained Lloyd (RL) algorithm and a deterministic annealing (DA) algorithm to optimize sensor deployment in both the homogeneous and heterogeneous WSNs. Our simulation results show that both the DA and the RL algorithms outperform the existing algorithms when Communication Range is limited.
-
sensor deployment with limited Communication Range in homogeneous and heterogeneous wireless sensor networks
arXiv: Networking and Internet Architecture, 2016Co-Authors: Jun Guo, Hamid JafarkhaniAbstract:We study the heterogeneous wireless sensor networks (WSNs) and propose the necessary condition of the optimal sensor deployment. Similar to that in homogeneous WSNs, the necessary condition implies that every sensor node location should coincide with the centroid of its own optimal sensing region. Moreover, we discuss the dynamic sensor deployment in both homogeneous and heterogeneous WSNs with limited Communication Range for the sensor nodes. The purpose of sensor deployment is to improve sensing performance, reflected by distortion and coverage. We model the sensor deployment problem as a source coding problem with distortion reflecting sensing accuracy. Traditionally, coverage is the area covered by the sensor nodes. However, when the Communication Range is limited, a WSN may be divided into several disconnected sub-graphs. Under such a scenario, neither the conventional distortion nor the coverage represents the sensing performance as the collected data in disconnected sub-graphs cannot be communicated with the access point. By defining an appropriate distortion measure, we propose a Restrained Lloyd (RL) algorithm and a Deterministic Annealing (DA) algorithm to optimize sensor deployment in both homogeneous and heterogeneous WSNs. Our simulation results show that both DA and RL algorithms outperform the existing Lloyd algorithm when Communication Range is limited.
Tomotaka Wada - One of the best experts on this subject based on the ideXlab platform.
-
ICPP Workshops - Sliding-Typed Communication Range Recognition Method for Indoor Position Estimation in Passive RFID Systems
2011 40th International Conference on Parallel Processing Workshops, 2011Co-Authors: Atsuki Inada, Manato Fujimoto, Tomotaka Wada, Kouichi Mutsuura, Yuki Oda, Emi Nakamori, Hiromi OkadaAbstract:RFID (Radio Frequency Identification) systems have become meaningful as a new identification source that is applicable in ubiquitous environments. Each RFID tag has a unique ID, and is attached to an object. A user reads the unique ID of an RFID tag with RFID readers and obtains the information of the object. One of the most important technologies that use the RFID system is the position estimation of RFID tags. The position estimation means to estimates the location of the object with the RFID tag. It is very useful to acquire the location information of RFID tag. If a user understands the position of the RFID tag, a new navigation system for persons in complex buildings. In this paper, we propose a new method for accurate indoor position estimation of passive RFID systems named as the Sliding-Typed CRR method. In this method, the position of an RFID tag is estimated by using S-CRR (Swift Communication Range Recognition) method. The proposed method is capable of accurate position estimation in any directions of RFID tags.
-
A Novel Communication Range Recognition (CRR) Scheme for Spatial Localization of Passive RFID Tags
IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, 2010Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:RFID (Radio Frequency Identification) technology is expected to be used as a localization tool. By the localization of RFID tags, a mobile robot equipped with an RFID reader can recognize the surrounding environment. In this paper, we propose a novel effective scheme called the Communication Range recognition (CRR) scheme for localizing RFID tags. In this scheme, an RFID reader determines the boundaries of the Communication Range when it is appropriately positioned by the robot. We evaluate the estimated position accuracy through numerous experiments. We show that the moving distance of the RFID reader in the proposed scheme is lower than that in conventional schemes.
-
GLOBECOM - A Novel Method for Position Estimation of Passive RFID Tags; Swift Communication Range Recognition (S-CRR) Method
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010Co-Authors: Manato Fujimoto, Norie Uchitomi, Atsuki Inada, Tomotaka Wada, Kouichi Mutsuura, Hiromi OkadaAbstract:The RFID (Radio Frequency IDentification) system is paid attention to as a new identification source that achieves a ubiquitous environment. Each RFID tag has the unique ID, and is attached to some object. A user reads the unique ID of a RFID tag with RFID readers and obtains the information on the object. One of the most important technologies that use the RFID system is the position estimation of RFID tags. The position estimation means to estimates the location of the object with the RFID tag. It can be very useful to acquire the location information of RFID tag. If a user can understand the position of the RFID tag, the position estimation can be applied to a navigation system for walkers. In this paper, we propose a new method named as Swift Communication Range Recognition (S-CRR) method as an extended improvement of the previous CRR method on the estimation delay. In this method, the position of RFID tag is estimated by selecting the Communication area model which corresponds to those boundary angles. We carry out the performance evaluation by the experiments of RFID system and show the effectiveness of S-CRR for position estimation.
-
A Novel localization scheme for passive RFID tags; Communication Range Recognition (CRR)
2009 IEEE International Conference on RFID, 2009Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:This paper focuses on the localization technology of passive RFID (Radio Frequency IDentification) tags. By this technology, we will be able to detect some target, to get information on it, and to find the position and the distance of it. This paper proposes a novel scheme named Communication Range Recognition (CRR) in order to localize RFID tags effectively. This scheme finds the edges of the Communication Range of the RFID reader antenna when its position is moving by the robot appropriately. We evaluate the performance of the estimated position error through numerous experiments. We show that our proposed scheme can reduce the moving distance of the RFID reader without degrading the accuracy of localization in comparison with the conventional schemes.
-
ICC - A Novel Scheme for Spatial Localization of Passive RFID Tags; Communication Range Recognition (CRR) Scheme
2009 IEEE International Conference on Communications, 2009Co-Authors: Tomotaka Wada, Norie Uchitomi, Kouichi Mutsuura, Yuuki Ota, Toshihiro Hori, Hiromi OkadaAbstract:The RFID (Radio Frequency IDentification) tag is expected to be used as a tool of localization. With the localization of RFID tags, a mobile robot with an installed RFID reader can recognize the surrounding environment. In addition, it can be applied to a navigation system for walkers. In this paper, we propose a new scheme named Communication Range Recognition (CRR) in order to localize RFID tags effectively. In this scheme, the RFID reader finds the edges of the Communication Range when its position is moved appropriately by the robot. We evaluate the performance of the estimated position error through numerous experiments. We show that our proposed scheme can reduce the moving distance of the RFID reader without degrading the accuracy of localization in comparison with the conventional schemes.
Richard H. Middleton - One of the best experts on this subject based on the ideXlab platform.
-
ECC - String stability analysis of a vehicle platoon with Communication Range 2 using the two-dimensional induced operator norm
2013 European Control Conference (ECC), 2013Co-Authors: Steffi Knorn, Richard H. MiddletonAbstract:Vehicle strings can be modelled as continuous-discrete 2D systems. However, every such 2D system includes a structural nonessential singularity on the stability boundary and special care is needed to analyse BIBO stability of the system. A unidirectional vehicle string with Communication Range 2 is analysed and simulated.
-
string instability in classes of linear time invariant formation control with limited Communication Range
IEEE Transactions on Automatic Control, 2010Co-Authors: Richard H. Middleton, Julio H BraslavskyAbstract:This paper gives sufficient conditions for string instability in an array of linear time-invariant autonomous vehicles with Communication constraints. The vehicles are controlled autonomously and are subject to a rigid or semi-rigid formation policy. The individual controllers are assumed to have a limited Range of forward and backward Communication with other vehicles. Sufficient conditions are given that imply a lower bound on the peak of the frequency response magnitude of the transfer function mapping a disturbance to the leading vehicle to a vehicle in the chain. This lower bound quantifies the effect of spacing separation policy, intervehicle Communication policy, and vehicle settling response performance. These results extend earlier works to give a unified treatment of heterogeneous, non-nearest neighbor Communication and semi-rigid one-dimensional formation control.