Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

Open optical networks have been considered to be important for cost-effectively building and operating networks. Recently, optical-circuit-switches (OCSes) have attracted industry and academia because of their cost efficiency and higher capacity than traditional electrical packet switches and reconfigurable optical add-drop multiplexers (ROADMs). Though the open interfaces and control planes for traditional ROADMs and transponders have been defined by several standard-defining organizations, those of OCSes have not. Considering that several OCSes have already been installed in production datacenter networks and several OCS products are on the market, bringing openness and interoperability into OCS-based networks has become important. Motivated by this fact, this paper investigates a software-defined networking controller for open optical-circuit-switched networks. To this end, we identified the use cases of OCSes and derived the controller requirements for supporting them. We then proposed a multi-vendor (MV) OCS controller framework that satisfies the derived requirements; it was designed to quickly and consistently operate fiber paths upon receiving the operation requests. We validated our controller by implementing it and evaluating its performance on actual MV-OCS networks. It satisfied all the requirements, and fiber paths could be configured within 1.0 s by using our controller.

DOI： 10.1364/jocn.558407

Language：English   Publishing type：Research paper (international conference proceedings)  

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

DOI： 10.1364/jocn.550838

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)  

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/mcom.001.2300741

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1364/JOCN.540792

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom52923.2024.10901258

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom52923.2024.10901239

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom52923.2024.10901077

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/IPC60965.2024.10799712

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

DOI： 10.1364/jocn.535282

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electronics, Information and Communications Engineers (IEICE)  

DOI： 10.1587/transfun.2023dmp0006

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

We propose methods and an architecture to conduct measurements and optimize newly installed optical fiber line systems semi-automatically using integrated physics-aware technologies in a data center interconnection (DCI) transmission scenario. We demonstrate, for the first time to our knowledge, digital longitudinal monitoring (DLM) and optical line system (OLS) physical parameter calibration working together in real-time to extract physical link parameters for fast optical fiber line systems provisioning. Our methodology has the following advantages over traditional design: a minimized footprint at user sites, accurate estimation of the necessary optical network characteristics via complementary telemetry technologies, and the capability to conduct all operation work remotely. The last feature is crucial, as it enables remote operation to implement network design settings for immediate response to quality of transmission (QoT) degradation and reversion in the case of unforeseen problems. We successfully performed semi-automatic line system provisioning over field fiber network facilities at Duke University, Durham, North Carolina. The tasks of parameter retrieval, equipment setting optimization, and system setup/provisioning were completed within 1 h. The field operation was supervised by on-duty personnel who could access the system remotely from different time zones. By comparing Q-factor estimates calculated from the extracted link parameters with measured results from 400G transceivers, we confirmed that our methodology has a reduction in the QoT prediction errors ( ±0.3dB ) over existing designs ( ±0.6dB ).

DOI： 10.1364/jocn.524669

Other Link： https://opg.optica.org/viewmedia.cfm?URI=jocn-16-9-894

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

Optical communication networks are operated with great care to avoid outages. In particular, significant outages having a devastating impact on society must be avoided, and several countries specify “significance standards” for network outages. Although the impact of possible outages strongly depends on routing methods for requested connections, there has been no research specifically on these standards. This paper for the first time, to the best of our knowledge, introduces a routing problem to minimize the impact of outages on a given significance standard. We have shown this problem to be non-deterministic polynomial-time hardness, and an efficient heuristic method is proposed. This method searches for a good solution by reducing the problem to a shortest-path search, where the significance of a link failure is regarded as the link weight, and suppresses outage impact compared with other routing methods. In addition, the analysis of the system dependence among a network model, mean time to repair (MTTR) of failure elements, and significance standards suggests that the total system design considering the MTTR, significance standards, and routing method could dramatically reduce the impact of significant outages on optical networks.

DOI： 10.1364/jocn.520509

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/icccn61486.2024.10637644

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/icton62926.2024.10647132

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

Datacenter networks (DCNs) consisting of optical circuit switches (OCSs) have been considered as a promising solution to dramatically improve their transmission capacity, energy efficiency, and communication latency. To scale optical-circuit-switched DCNs (OCS DCNs), hierarchical OCSs with tens of thousands of optical fibers need to be installed, and they should be inspected before starting datacenter operations. Since traditional DCNs consist of electrical-packet switches (EPSs), the condition and cabling of fibers can be inspected easily by probing neighboring EPSs. However, OCS networks cannot be inspected in the same manner because OCSs cannot transmit and receive probe signals. Thus, we have had to attach and detach a light source and power meter (LSPM) to every switch for probing all the fibers, which takes weeks. This paper proposes an efficient method for inspecting and certifying fibers in an entire DCN without repeating LSPM reattachment. Our method is based on (1) theories on quickly estimating the fiber condition on the basis of the intensity of received probe signals, (2) the maximum allowable loss of each fiber derived from the transceiver budget used in operations, and (3) an algorithm that reduces the number of probes needed. The results from an extensive numerical evaluation indicate that our method inspected a DCN with 18,432 fibers in at most a day, whereas a baseline method involving repeated LSPM reattachment would take more than a week. We also confirmed that our method never produced false negatives and false positives under practical network conditions.

DOI： 10.1364/jocn.527794

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：(MISC) Introduction and explanation (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2024.3416861

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/lnet.2023.3322172

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1364/JOCN.513898

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

There are increasing requirements for data center interconnection (DCI) services, which use fiber to connect any DC distributed in a metro area and quickly establish high-capacity optical paths between cloud services and mobile edge computing and the users. In such networks, coherent transceivers with various optical frequency ranges, modulators, and modulation formats installed at each connection point must be used to meet service requirements such as fast-varying traffic requests between user computing resources. This requires technology and architectures that enable users and DCI operators to cooperate to achieve fast provisioning of WDM links and flexible route switching in a short time, independent of the transceiver’s implementation and characteristics. We propose an approach to estimate the end-to-end (EtE) generalized signal-to-noise ratio (GSNR) accurately in a short time, not by measuring the GSNR at the operational route and wavelength for the EtE optical path but by simply applying a quality of transmission probe channel link by link, at a wavelength/modulation-format convenient for measurement. Assuming connections between transceivers of various frequency ranges, modulators, and modulation formats, we propose a device software architecture in which the DCI operator optimizes the transmission mode between user transceivers with high accuracy using only common parameters such as the bit error rate. In this paper, we first implement software libraries for fast WDM provisioning and experimentally build different routes to verify the accuracy of this approach. For the operational EtE GSNR measurements, the accuracy estimated from the sum of the measurements for each link was 0.6 dB, and the wavelength-dependent error was about 0.2 dB. Then, using field fibers deployed in the NSF COSMOS testbed, a Linux-based transmission device software architecture, and transceivers with different optical frequency ranges, modulators, and modulation formats, the fast WDM provisioning of an optical path was completed within 6 min.

DOI： 10.1364/jocn.505729

Other Link： https://opg.optica.org/viewmedia.cfm?URI=jocn-16-2-233&seq=0

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom54140.2023.10437204

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Best paper award

DOI： 10.1109/globecom54140.2023.10437754

Language：English   Publishing type：Research paper (international conference proceedings)  

Best paper award

DOI： 10.1049/icp.2023.2048

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2022.3228909

Language：English   Publishing type：(MISC) Introduction and explanation (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2023.3280230

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/icc45041.2023.10279779

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/infocom53939.2023.10228897

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/infocom53939.2023.10229107

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

A communication network is a multilayer network comprising various layered technologies, and the underlying physical topology is an important aspect that determines the upper bound of overall system performance, including total communication capacity, cost, and robustness. We expect that understanding the impact of the physical topology on system performance will lead to better optical communication network design in the future, and we thus focus on clarifying the relationship between physical topology features and system performance. There have been various studies on the relationship between topology features and overall network performance. For example, the average number of hops and the cluster coefficient are well known to change network properties in complex networks. From the perspective of optical communication networks, it is known that the algebraic connectivity and average path length are related to total network capacity, and these findings have been applied in physical topology design models. On the other hand, there have been no quantitative comparisons among various topology features, and the comprehensiveness of the population from which these features are extracted is insufficient. Hence, we have developed a multilayer (physical topology and layer 1) correlation analysis framework that enables a quantitative comparison of topology features. We use this framework to numerically examine the relationships between physical topology features and the total communication capacity, cost, and robustness of optical communication networks, including graph features (especially graph spectra) that have not been investigated. The results show that the Laplacian spectral radius and geodesic distance Laplacian spectral radius are strongly related to system performance, in addition to the conventional average number of hops, cluster coefficient, algebraic connectivity, and average path length. We confirm that these correlations hold for the different network sizes and spatial nonuniformity of real optical backbone networks in different countries and regions. The results show that the average path length and cluster coefficient, or the Laplacian spectral radius and geodesic distance Laplacian spectral radius, are important guidelines for physical topology design of real optical backbone networks.

DOI： 10.1364/jocn.479866

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/mcom.006.2200567

DOI： 10.48550/arXiv.2209.02217

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/lnet.2023.3267122

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/GLOBECOM48099.2022.10001640

Other Link： https://dblp.uni-trier.de/db/conf/globecom/globecom2022.html#OnakaNINYS22

Authorship：Last author   Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/icc45855.2022.9838781

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.23919/ondm54585.2022.9782867

Authorship：Lead author   Language：Japanese  

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/GLOBECOM46510.2021.9685283

Other Link： https://dblp.uni-trier.de/db/conf/globecom/globecom2021.html#NakamuraINY21

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom46510.2021.9685249

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/LNET.2021.3114722

Language：English   Publishing type：(MISC) Introduction and explanation (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2021.3127543

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/globecom46510.2021.9685539

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Information Processing Society of Japan  

DOI： 10.2197/ipsjjip.29.630

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1364/OECC.2021.JS2A.14

Language：English   Publishing type：(MISC) Prompt report, short report, and research note, etc. (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2021.3058742

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/icoin50884.2021.9333962

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electronics, Information and Communications Engineers (IEICE)  

DOI： 10.1587/transcom.2020sep0005

Language：English   Publishing type：(MISC) Prompt report, short report, and research note, etc. (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tnsm.2020.3038736

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

<title>Abstract</title>
Various smart connected devices are emerging like automated driving cars, autonomous robots, and remote-controlled construction vehicles. These devices have vision systems to conduct their operations without collision. Machine vision technology is becoming more accessible to perceive self-position and/or the surrounding environment thanks to the great advances in deep learning technologies. The accurate perception information of these smart connected devices makes it possible to predict wireless link quality (LQ). This paper proposes an LQ prediction scheme that applies machine learning to HD camera output to forecast the influence of surrounding mobile objects on LQ. The proposed scheme utilizes object detection based on deep learning and learns the relationship between the detected object position information and the LQ. Outdoor experiments show that LQ prediction proposal can well predict the throughput for around 1 s into the future in a 5.6-GHz wireless LAN channel.

DOI： 10.1186/s13638-020-01829-8

Other Link： http://link.springer.com/article/10.1186/s13638-020-01829-8/fulltext.html

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electronics, Information and Communications Engineers (IEICE)  

DOI： 10.1587/transcom.2019ebp3119

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.2019NRP0004

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：(MISC) Other article  

DOI： 10.1587/nolta.11.1

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/GLOBECOM38437.2019.9014232

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：(MISC) Other article  

DOI： 10.1109/TNSM.2019.2934363

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TR.2018.2877775

Language：Japanese  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.ress.2019.03.026

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.2018EBP3072

Scopus

Language：English   Publishing type：(MISC) Other article  

DOI： 10.1587/nolta.10.1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/LCOMM.2018.2875431

Language：English   Publisher：Nippon Telegraph and Telephone Corp.  

Scopus

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/MWC.2018.1700417

Language：Japanese   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Acceptance rate 19.2%

DOI： 10.1109/INFOCOM.2018.8485859

Other Link： https://dblp.uni-trier.de/db/conf/infocom/infocom2018.html#NishinoIYMN18

Language：Japanese   Publishing type：(MISC) Introduction and explanation (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

DOI： 10.1109/MWC.2017.1700244

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

DOI： 10.1109/GLOCOM.2017.8254036

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier B.V.  

DOI： 10.1016/j.comcom.2017.11.011

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TNSM.2017.2723725

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TC.2017.2709742

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transfun.E100.A.1773

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Information Processing Society of Japan  

DOI： 10.2197/ipsjjip.25.459

Scopus

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/MWC.2016.1600317WC

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICDCS.2017.169

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/COMST.2017.2707140

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.comcom.2016.01.013

Web of Science

Language：English   Publisher：電子情報通信学会  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TNSM.2016.2582179

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.2015ADP0011

Web of Science

Language：English   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s10009-014-0352-z

Web of Science

Language：Japanese   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

Language：Japanese   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICDCS.2016.52

Web of Science

Other Link： http://doi.ieeecomputersociety.org/10.1109/ICDCS.2016.52

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICNP.2016.7784412

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICC.2016.7510608

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/INFOCOM.2016.7524412

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/VTCFall.2016.7881581

Web of Science

Language：English   Publisher：Information and Media Technologies Editorial Board  

Structured overlay networks that support range queries cannot hash data IDs for load balancing, in order to preserve the total order on the IDs. Since data and queries are not equally distributed on the ID-space without hashing in range-based overlay networks, uneven loads are imposed on the overlay nodes. Existing load balancing techniques for range-based overlay networks distribute the loads by using data reallocation or node migration, which makes the networks very unstable due to heavy data reallocation or frequent churn. This paper proposes a novel scheme that distributes, fairly, the loads without node migration and with little data reallocation, by sharing some ID-space regions between neighboring nodes. Our "overlapping" ID-space management scheme derives the optimal overlap based on kernel density estimations; the query loads based on the statistical theory are used to calculate the best overlap regions. This calculation is executed in a distributed manner with no central coordinator. We conduct thorough computer simulations, and show that our scheme alleviates the worst node load by 20-90% against existing techniques without node migration and with least data reallocation.

DOI： 10.11185/imt.11.1

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

J-GLOBAL

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：電子情報通信学会  

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11309/jssst.32.3_101

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TSG.2014.2359114

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

Most modern Internet services are carried over the web. A significant amount of web transactions is now encrypted and the transition to encryption has made it difficult for network operators to understand traffic mix. The goal of this study is to enable network operators to infer hostnames within HTTPS traffic because hostname information is useful to understand the breakdown of encrypted web traffic. The proposed approach correlates HTTPS flows and DNS queries/responses. We introduce domain name graph (DNG), which is a formal expression that characterizes the highly dynamic and diverse nature of DNS mechanisms. Furthermore, we have developed a framework called Service-Flow map (SFMap) that works on top of the DNG. SFMap statistically estimates the hostname of an HTTPS server, given a pair of client and server IP addresses. We evaluate the performance of SFMap through extensive analysis using real packet traces collected from two locations with different scales. We demonstrate that SFMap establishes good estimation accuracies and outperforms a state-of-the-art approach.

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.E98.B.437

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Acceptance rate 35.4%

DOI： 10.1109/GLOCOM.2014.7417638

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/APCC.2015.7412563

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-319-17172-2_9

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Fuzzy Theory and Intelligent Informatics  

With the spread of mobile devices with positioning systems like GPS, user locations can be obtained in realtime with great accuracy. However, these realtime and accurate location information allows malicious people to identify users in the real space, which causes serious loss of anonymity. Though users can be anonymized with noises on their location, quality of location services would be also degraded. This paper proposes Virtual Scent, which is a novel method to obscure user locations without compromising k-anonymity as well as accuracy. Virtual Scent shows its users as ambiguous "scents" on a map, which can anonymize them. Though each scent has a noise on its location, they are positioned to be mixed up at a most likely location. We evaluate Virtual Scent with thorough simulation and experiments, which reveal its accuracy and practicality.

DOI： 10.3156/jsoft.26.820

Language：Japanese   Publishing type：(MISC) Introduction and explanation (scientific journal)  

J-GLOBAL

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

In software-defined networking, applications are allowed to access a global view of the network so as to provide sophisticated functionalities. They commonly rely on packet classification, but unlike the conventional classification problem to search for the action taken at a single switch, the global network view requires to identify the network-wide behavior of the packet. Conventional classification methods, however, fail to well support network-wide behaviors, since the search space is complicatedly partitioned. This paper proposes a novel packet classification method that efficiently supports network-wide packet behaviors. Our method utilizes a compressed data structure named the multi-valued decision diagram, allowing it to manipulate the complex search space with several algorithms. Experiments with real network datasets show that our method identifies the packet behavior at 20.1 Mpps on a single CPU core with only 8.4 MB memory.

CiNii Books

J-GLOBAL

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

Building optimal virtual networks across multiple domains is an essential technology to offer flexible network services. However, existing research unrealistically assumes that providers will share their private information. Providers, as is well known, never actually do that to remain competitive. Technically, secure multi-party computation, which is a cryptographic tool, can be used to secure optimization, but it is too time-consuming. This paper presents a novel method to optimize virtual networks built over multiple domains, with great efficiency but without revealing any private information. Our method employs secure multi-party computation but only for masking sensitive values to evade time-consuming computation. It is solidly based on the theory of optimality, and is assured of finding reasonably optimal solutions. Experiments show that our method finds nearly optimal solutions in just a few minutes for virtual network with tens of nodes.

J-GLOBAL

Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TSG.2013.2288976

Web of Science

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICCCN.2014.6911811

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICNP.2014.52

Web of Science

Other Link： http://doi.ieeecomputersociety.org/10.1109/ICNP.2014.52

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/TNSM.2016.2582179

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

File： katayama13scalability.pdf

DOI： 10.1587/transcom.E96.B.2784

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：Japanese   Publishing type：(MISC) Introduction and explanation (scientific journal)  

CiNii Books

J-GLOBAL

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.E95.B.2210

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publisher：一般社団法人電子情報通信学会  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer  

DOI： 10.1007/978-3-642-32498-7_18

Scopus

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

Several servers providing disaster-related information often went down after Tohoku earthquake and tsunami, due to flash crowds caused by Twitter. URLs are usually shortened in Twitter by a URL shortener, since message length is strictly limited. We find that URL shorteners form a new indirection layer and traffic can be diverted in the layer. This encourages us to develop rcdn.info just after the earthquake; rcdn.info takes advantage of this layer to redirect the flash crowds to a CDN. This paper describes rcdn.info and analyzes the access logs.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

Recently, novel algorithms that enumerate all possible paths on a graph have been proposed. They commonly take advantage of Zero-suppressed Binary Decision Diagram, or ZDD, which is an efficient data structure for representing family of sets. These algorithms treat a path as a set of edges, and so ZDD is allowed to handle paths in its own way. ZDD&#039;s efficient algebra is also used in the algorithms to select required paths. We develop a path management system that relies on the ZDD path enumeration algorithm. Our management system accepts some filtering conditions to select paths, and finds the best one from them. The best path is correctly chosen without approximation even if there is a dependency among link failures. Despite of the correctness, our system is quite efficient; 1126509504221649 paths on a grid network of 81 nodes are enumerated in 1.85 seconds, and these paths are filtered and the best one is found in 0.1 seconds.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

We report on the results of research into the route calculation for Flexcast-type streaming considering metrics by unicast transfer and duplicate data in application layer. This route calculation considers metrics of application layer and metrics of transfer route between Flexcast servers in layer 3. We show the formulation of the route calculation by LP(Linear Programming) and this method enable to calculate the optimum route has been considered the metrics.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

File： inoue11iauth.pdf

DOI： 10.1587/transcom.E94.B.466

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1145/2079360.2079368

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

File： inoue10web.pdf

DOI： 10.1587/transinf.E93.D.3181

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

Current Web authentication methods have their own issues. Forms and cookies, which is most commonly used, has a long-standing issue called tracking cookies. HTTP provides an access authentication framework, but it is rarely used because of lack of presentational control. This paper proposes iAuth, which brings presentational control to the HTTP access autentication framework. iAuth enables servers to provide log-in forms. iAuth does not have its own authentication mechanism, but any mechanism including Basic and Digest authentications can be incorporated with it. Since iAuth has backward compatibility with legacy systems, developers are allowed to introduce iAuth into their Web sites or browsers independently. We made experiments to confirm the correctness, by running an iAuth server against not only an iAuth client but major legacy browsers.

CiNii Books

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE Computer Society  

DOI： 10.1109/WAINA.2010.124

Scopus

Other Link： http://doi.ieeecomputersociety.org/10.1109/WAINA.2010.124

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-642-12098-5_27

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/GLOCOMW.2010.5700337

Web of Science

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE Computer Society  

DOI： 10.1109/COMPSAC.2010.64

Scopus

Other Link： http://doi.ieeecomputersociety.org/10.1109/COMPSAC.2010.64

Language：Japanese   Publishing type：(MISC) Introduction and explanation (commerce magazine)  

CiNii Books

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Introduction and explanation (commerce magazine)  

Language：Japanese   Publishing type：(MISC) Introduction and explanation (scientific journal)   Publisher：一般社団法人情報処理学会  

CiNii Books

J-GLOBAL

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/PDCAT.2009.41

Web of Science

Other Link： http://doi.ieeecomputersociety.org/10.1109/PDCAT.2009.41

Language：Japanese   Publishing type：(MISC) Introduction and explanation (commerce magazine)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.future.2006.04.001

Web of Science

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

CiNii Books

J-GLOBAL

Other Link： http://www.ntt.co.jp/journal/0608/files/jn200608045.pdf

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

File： inoue06formulation.pdf

DOI： 10.1093/ietisy/e89-d.2.687

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

File： inoue06analysis.pdf

DOI： 10.1093/ietcom/e89-b.1.38

Web of Science

Language：English   Publishing type：(MISC) Institution technical report and pre-print, etc.  

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

As broadband internet access is more commonly provided, applications of streaming data transport becomes more popular, and wide-area multicast technology will be more important. In such multicast services, the server and client programs must correspond to each other. However, in the case of wide-area (or open) services, it is not easy to distribute the correct client application program to all prospective users, and also hard to update those programs as the latest version. In this paper, we propose a framework of programmable multicast applications based on Flexcast protocol and JavaApplet. In this method, we do not need the standardization effort of client application programs before starting services.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

Distance education systems are very attractive but are expensive. We propose to lower the cost of transferring lecture notes to many people by combining TTT(TeleTeachingTool) with Flexcast. The former offers high resolution delivery by using lossless coding. The latter makes good use of the flexibility of IP networks in delivering data to many people. An in-office IP network is used to conduct initial tests with delivery to one terminal. The resulting image quality confirms the feasibility of our proposal. We also evaluate the effects of traffic shaping and FEC(Forward Error Correction) as measures against packet losses.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICPADS.2005.124

Web of Science

Other Link： http://doi.ieeecomputersociety.org/10.1109/ICPADS.2005.124

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/APCC.2005.1554059

Web of Science

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

In this paper, we discuss the efficiency of tunneling techniques that accelerate multicast deployment. Our motivation is that, despite the many proposals focused on tunneling techniques, no paper has studied their impact on multicast efficiency. Through detailed computer experiments, we find that there is a critical size of multicast island, above which the loads imposed on tunneling endpoints are suddenly diminished. In addition, multicast islands equaling or exceeding the critical size reduce the overhead of forwarding states on routers. We also find a scaling law between the critical size and group size. Based on these findings, we present simple guidelines on using tunneling when deploying multicast systems.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：一般社団法人電子情報通信学会  

In this paper, we present the design principles of our economical multicast systems and show performance evaluation results. Our systems realize quick deployment of multicast services and keeps up with demand. The system is based on new multicast technology named Flexcast. In Flexcast, branching points are on routers like IP multicast, branching function is, however, realized in the upper layer. Henceforth, Flexcast works even in such networks that include routers that don&#039;t support Flexcast. In development of Flexcast router, we adopted clustering approach that is succeeding in web search systems and GRID computing. Though this is not a standard router architecture, it brings high scalability and availability to our system without much inventment. Finally, experimental results reveal that our systems achieve high performance, scalability, and availability.

CiNii Books

J-GLOBAL

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

Flexcast is a highly scalable multicast protocol based on a recursive unicast approach. Unlike IP multicast approach, Flexcast works even if there are multicast in-capable routers. In this paper, we improve the Flexcast protocol to construct optimal multicast trees. Simulation results confirm that Flexcast constructs optimal trees with less control packets than other protocols that are based on the recursive unicast approach. The results also demonstrate that Flexcast provides enough multicast effects even if Flexcast capable routers are partially deployed.

CiNii Books

Language：English   Publishing type：Research paper (international conference proceedings)  

File： inoue03widearea.pdf

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

Scopus

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

We proposed an autonomous pervasive multicast scheme - Flexcast. Flexcast uses just unicast messages, so that it can work even in traditional IP networks, where IP multicast routing is not supported. Flexcast delivery trees are construeted automatically without any pre-configurations. In this paper, we introduces Flexcast Gateway, which translates Flexcast protocol and IGMP transparently. This enables IP multicast applications to work in the traditional IP networks. Results of field experiments are also shown.

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this experiment, the wide-area simultaneous multi-point distribution of HD class IP streams was implemented on JGN to verify the capability and to extract the issues for further studies with regard to (1) Transmitting technologies to handle extensive multiple areas (Flexcast) and (2) QoS technologies based on dynamic load balancing that suit MPLS routers; potential problems were elucidated. The following achievements were recorded. The experiment has confirmed that the problem of image distortion caused by excessive loading of the streaming servers or insufficient bandwidth, which had previously hindered high volume IP streaming from end users, has been successfully resolved, so receivers can enjoy the transferred images whose quality equals that of the original material. This leads to the stream distribution of motion pictures and videos with high quality which will satisfy cultivated audiences, anywhere and anytime.

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：English   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

Web of Science

Scopus

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

Current mobile networks handle the locations of mobile terminals uniformly, even though many terminals often move together, e.g. mobile terminals on a train or a bus. In our work, one of co-moving terminals create a mobile location area around it and the location management system handles them collectively, thereby the number of location updates can be reduced. However, mobile terminals need an algorithm to choice a location area which moves together with them. We present an efficient algorithm for location management; each mobile terminal uses the connection history which records location areas it passed, in order to know which location area moves together with the terminal. We show effectiveness of our algorithmby various simulation results.

CiNii Books

Language：Japanese   Publishing type：(MISC) Introduction and explanation (bulletin of university, research institution)  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

The rapid growth of the mobile terminal usage is further anticipated, and makes severe demands on the network infrastructure, especially on the mobility management system.Though the directions and speed of the movements of the mobile terminals(and their users of course)may diverse, often there is a situation that many terminals move together;an obvious example is a commuter train.Aggregated handling of those comoving terminals can reduce the load of the mobility management system drastically.In this paper, we claim those aggregation should be done by considering not only the place of the terminals, but also their movements.We present an efficient aggregation algorithm which uses the connectivity history, and show its effectiveness by simulation results.

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

The growth of the Internet has placed demands for the flexible and fast-deployable service capability on the network infrastructure. Active Networks seek to meet these demands using programmable packets which are interpreted and executed on each of routers en route. In this paper we show our approach for the Active Networking, including the propositions of the expressive packet-programming language and the hardware architecture for fast execution of the packet programs. We also describe our software prototype and its evaluation.

CiNii Books

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1088/0741-3335/43/1/102

Web of Science

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Publishing type：(MISC) Summary of the papers read (national conference and other science council)  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Oral presentation(invited, special)  

Language：English   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Oral presentation(general)  

Event date： 2022.3

Language：English   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：English   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Poster presentation  

若手部門 最優秀ポスター賞
http://mika-wc.org/award/mika2019prize/

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Poster presentation  

Event date： 2018.11

Language：English   Presentation type：Oral presentation(keynote)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Symposium workshop panel(nominated)  

Language：English   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：English   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：English   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(invited, special)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Poster presentation  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：Japanese   Presentation type：Public discourse, seminar, tutorial, course, lecture and others  

Language：Japanese   Presentation type：Oral presentation(general)  

Language：Japanese   Presentation type：Poster presentation  

Language：English   Presentation type：Poster presentation  

Work type：Software  

Work type：Software  

Work type：Software  

Work type：Software  

Work type：Software  

Work type：Software  

Work type：Software  

Work type：Software  

Application no：特願2022-567946  Date applied：2020.12

Patent/Registration no：特許7460934  Date registered：2024.3 

Application no：特願2022-516497  Date applied：2020.4

Patent/Registration no：特許7380854  Date registered：2023.11 

Application no：特願2022-516498  Date applied：2020.4

Patent/Registration no：特許7276601  Date registered：2023.5 

Application no：特願2022-502350  Date applied：2020.2

Patent/Registration no：特許7351397  Date registered：2023.9 

Application no：特願2021-562410  Date applied：2019.12

Patent/Registration no：特許7294450  Date registered：2023.6 

Application no：特願2019-200431  Date applied：2019.11

Patent/Registration no：特許7239932  Date registered：2023.3 

Application no：特願2021-550800  Date applied：2019.10

Patent/Registration no：特許7226575  Date registered：2023.2 

Application no：特願2021-548028  Date applied：2019.9

Patent/Registration no：特許7306465  Date registered：2023.7 

Application no：特願2021-528757  Date applied：2019.6

Patent/Registration no：特許7103522  Date registered：2022.7 

Application no：特願2021-515694  Date applied：2019.4

Patent/Registration no：特許7184172  Date registered：2022.11 

Application no：特願2021-515692  Date applied：2019.4

Patent/Registration no：特許7276432  Date registered：2023.5 

Application no：特願2021-515691  Date applied：2019.4

Patent/Registration no：特許7276431  Date registered：2023.5 

Application no：特願2021-515693  Date applied：2019.4

Patent/Registration no：特許7184171  Date registered：2022.11 

Application no：特願2019-534056  Date applied：2018.7

Patent/Registration no：特許6831527  Date registered：2021.2 

WO2019/026684

Application no：特願2018-113884  Date applied：2018.6

Patent/Registration no：特許7095426  Date registered：2022.6 

Application no：特願2018-020603  Date applied：2018.2

Patent/Registration no：特許7041917  Date registered：2022.3 

Application no：特願2017-245568  Date applied：2017.12

Patent/Registration no：特許6939516  Date registered：2021.9 

Application no：特願2017-245569  Date applied：2017.12

Patent/Registration no：特許6981232  Date registered：2021.11 

Application no：特願2017-164724  Date applied：2017.8

Patent/Registration no：特許6737747  Date registered：2020.7 

Application no：特願2017-151201  Date applied：2017.8

Patent/Registration no：特許6716511  Date registered：2020.6 

Application no：特願2016-230507  Date applied：2016.11

Patent/Registration no：特許6600917  Date registered：2019.10 

Application no：特願2016-168907  Date applied：2016.8

Patent/Registration no：特許6589223  Date registered：2019.9 

Application no：特願2016-169027  Date applied：2016.8

Patent/Registration no：特許6653642  Date registered：2020.1 

Application no：特願2016-146887  Date applied：2016.7

Patent/Registration no：特許6581546  Date registered：2019.9 

Application no：特願2016-119847  Date applied：2016.6

Patent/Registration no：特許6562358  Date registered：2019.8 

Application no：特願2016-101190  Date applied：2016.5

Patent/Registration no：特許6602259  Date registered：2019.10 

Application no：特願2016-081038  Date applied：2016.4

Patent/Registration no：特許6602252  Date registered：2019.10 

Application no：特願2015-215378  Date applied：2015.11

Patent/Registration no：特許6438375  Date registered：2018.11 

Application no：特願2015-201846  Date applied：2015.10

Patent/Registration no：特許6473406  Date registered：2019.2 

Application no：特願2015-175554  Date applied：2015.9

Patent/Registration no：特許6388856  Date registered：2018.8 

Application no：特願2015-175054  Date applied：2015.9

Patent/Registration no：特許6387332  Date registered：2018.8 

Application no：特願2015-78854  Date applied：2015.4

Patent/Registration no：特許6353395  Date registered：2018.6 

Application no：特願2015-053408  Date applied：2015.3

Patent/Registration no：特許6282606  Date registered：2018.2 

Application no：特願2015-028743  Date applied：2015.2

Patent/Registration no：特許6347431  Date registered：2018.6 

WO/2016/133066 (15/546169)

Application no：特願2015-028744  Date applied：2015.2

Patent/Registration no：特許6198195  Date registered：2017.9 

WO/2016/133064

Application no：特願2014-177069  Date applied：2014.9

Patent/Registration no：特許6194296  Date registered：2017.8 

Application no：特願2014-138505  Date applied：2014.7

Patent/Registration no：特許6291371  Date registered：2018.2 

Application no：特願2014-132603  Date applied：2014.6

Patent/Registration no：特許6143367  Date registered：2017.5 

Application no：特願2014-033507  Date applied：2014.2

Patent/Registration no：特許6034815  Date registered：2016.11 

Application no：特願2011-031872  Date applied：2011.2

Patent/Registration no：特許5432197  Date registered：2013.12 

Application no：特願2011-022790  Date applied：2011.2

Patent/Registration no：特許5499369  Date registered：2014.3 

Application no：特願2010-165533  Date applied：2010.7

Patent/Registration no：特許5345981  Date registered：2013.8 

Application no：特願2010-129178  Date applied：2010.6

Patent/Registration no：特許5424988  Date registered：2013.12 

Application no：特願2010-028077  Date applied：2010.2

Patent/Registration no：特許5354606  Date registered：2013.11