Prof. Masayuki Murata Profile

Prof. Masayuki Murata

at Osaka University

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Author

Publications (27)

Proceedings Article | 2 October 2006 Paper

A cooperation mechanism for pure P2P file-sharing networks to improve application-level QoS

Naoki Wakamiya, Junjiro Konishi, Masayuki Murata

Proceedings Volume 6387, 638706 (2006) https://doi.org/10.1117/12.685087

KEYWORDS: Computer simulations, Data transmission, Floods, Information science, Information technology, Overlay metrology, Control systems, Network architectures, Sensor networks, Internet

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Proceedings Article | 28 September 2006 Paper

Implementation and evaluation of fast lightpath setup method in wavelength-routed WDM networks

Masatoshi Ohashi, Shin'ichi Arakawa, Masayuki Murata

Proceedings Volume 6354, 63541V (2006) https://doi.org/10.1117/12.689020

KEYWORDS: Wavelength division multiplexing networks, Light wave propagation, Optical fibers, Computer simulations, Data transmission, Switching, Data modeling, Internet, Failure analysis, Information science

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Proceedings Article | 6 December 2005 Paper

On the integration of IP routing and wavelength routing in IP over WDM networks

Yuki Koizumi, Shin'ichi Arakawa, Masayuki Murata

Proceedings Volume 6022, 602205 (2005) https://doi.org/10.1117/12.636546

KEYWORDS: Wavelength division multiplexing networks, Wavelength division multiplexing, Computer simulations, Control systems, Databases, Optical fibers, Interfaces, Internet, Data modeling, Information science

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Proceedings Article | 8 February 2005 Paper

Optical-code-based optical burst switching networks

Ken-ichi Kitayama, Naoya Wada, Masayuki Murata, Shinsuke Hara

Proceedings Volume 5626, (2005) https://doi.org/10.1117/12.582784

KEYWORDS: Switching, Process control, Optical networks, Wavelength division multiplexing, Optical switching, Signal processing, Electronics, Ultrafast phenomena, Packet switching, Switches

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Proceedings Article | 25 October 2004 Paper

Steady-state and transient-state analyses of TCP and TCP-friendly rate control mechanism using a control theoretic approach

Hiroyuki Hisamatsu, Hiroyuki Ohsaki, Masayuki Murata

Proceedings Volume 5598, (2004) https://doi.org/10.1117/12.571591

KEYWORDS: Probability theory, Systems modeling, Internet, Computer simulations, Analytical research, Video, Linear filtering, Feedback control, Information science, Information technology

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Proceedings Article | 25 October 2004 Paper

Packet marking function of active queue management mechanism: should it be linear, concave, or convex?

Hiroyuki Ohsaki, Masayuki Murata

Proceedings Volume 5598, (2004) https://doi.org/10.1117/12.571797

KEYWORDS: Control systems, Telecommunications, Beryllium, Information science, Information technology, Performance modeling, Stochastic processes, Ordinary differential equations

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Proceedings Article | 25 October 2004 Paper

Implementation and evaluation of cooperative proxy caching mechanisms for video streaming services

Yoshiaki Taniguchi, Naoki Wakamiya, Masayuki Murata

Proceedings Volume 5601, (2004) https://doi.org/10.1117/12.571031

KEYWORDS: Video, Signal processing, Receivers, Video processing, Video coding, Internet, Data communications, Multimedia, Telecommunications, Data processing

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Proceedings Article | 8 August 2003 Paper

Modeling a heterogeneous network with TCP connections using fluid flow approximation and queuing theory

Hiroyuki Hisamatu, Hiroyuki Ohsaki, Masayuki Murata

Proceedings Volume 5244, (2003) https://doi.org/10.1117/12.509622

KEYWORDS: Probability theory, Control systems, Network security, Internet, Systems modeling, Feedback control, Radon, Information science, Information technology, Computer simulations

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Proceedings Article | 8 August 2003 Paper

Replication methods for enhancing search performance in peer-to-peer services on power-law logical networks

Shingo Ata, Masayuki Murata, Yoshihiro Gotoh

Proceedings Volume 5244, (2003) https://doi.org/10.1117/12.509273

KEYWORDS: Data transmission, Internet, Computer simulations, Performance modeling, Receivers, Communication engineering, Information science, Information technology, Neodymium

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Many services have recently been offered based on a peer-to-peer (P2P) communication model. Peers connect to each other and build an overlaid logical network and available services are communicated over this network. The robustness of the P2P network against frequent peer failure must be considered. This includes when the peers leave the network and this directly affects the stability of the entire logical network. Replication of the content is one of the most useful techniques to increase robustness. However, the overall effectiveness of replication is heavily dependent on the topology of the logical network. As topology of networks, including the Internet and P2P, follows a Power-Law distribution pattern, we first investigate the effect of the logical network topology (especially of the Power-Law characteristics) on replication methods. We use a search method called "n-walkers random walk" in which multiple queries move randomly across the P2P logical network. We use a "path replication method," to create replicas at all the intermediate nodes on the path between the requesting and responding nodes. Through simulations experiments, we observed that peers with a large number of degrees (e.g., degree > 10) make four times as many replicas as peers with a small number of degrees. In addition, replicas on large degree's peers are used ten times as frequently as those on peers with small degrees. Based on these observations, we propose a query forwarding method that considers the Power-Law property of the network topology in order to improve the performance of the P2P service. In our method the queries are transmitted with different probabilities, dependending on the degree of each adjacent node. Our simulation results show that our proposed method can greatly improve the query performance by considering the characteristics of Power-Law. Our method reduces the average hop count in finding replicas by up to 60% compared with the random forwarding method.

Proceedings Article | 9 September 2002 Paper

Proposal for procedures to reconfigure logical topologies in reliable WDM-based mesh networks

Shinya Ishida, Shin'ichi Arakawa, Masayuki Murata

Proceedings Volume 4910, (2002) https://doi.org/10.1117/12.482427

KEYWORDS: Switches, Multiplexing, Wavelength division multiplexing, Detection and tracking algorithms, Wavelength division multiplexing networks, Reliability, Algorithm development, Networks, Tolerancing, Optical switching

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Proceedings Article | 3 July 2002 Paper

Packet scheduling for WDM fiber delay line buffers in photonic packet switches

Takashi Yamaguchi, Ken-ichi Baba, Masayuki Murata, Ken-ichi Kitayama

Proceedings Volume 4874, (2002) https://doi.org/10.1117/12.475303

KEYWORDS: Switches, Wavelength division multiplexing, Switching, Multiplexers, Multiplexing, Computer architecture, Transmittance, Information science, Communication engineering, Control systems

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Proceedings Article | 3 July 2002 Paper

Performance analysis of prioritized buffer management in photonic packet switches for DiffServ assured forwarding

Hiroaki Harai, Masayuki Murata

Proceedings Volume 4874, (2002) https://doi.org/10.1117/12.475306

KEYWORDS: Switches, Optical switching, Testing and analysis, Optical fibers, Switching, Analytical research, Network architectures, Internet, Transition metals, Multimedia

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Proceedings Article | 1 July 2002 Paper

Designing a delay-based adaptive congestion control mechanism using control theory and system identification for TCP/IP networks

Mitsushige Morita, Hiroyuki Ohsaki, Masayuki Murata

Proceedings Volume 4865, (2002) https://doi.org/10.1117/12.473384

KEYWORDS: Control systems, System identification, Data modeling, Time metrology, Systems modeling, Adaptive control, Performance modeling, Mathematical modeling, Internet, Linear filtering

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Proceedings Article | 1 July 2002 Paper

Multivariate analysis for performance evaluation of active-queue-management mechanisms in the Internet

Tomoya Eguchi, Hiroyuki Ohsaki, Masayuki Murata

Proceedings Volume 4865, (2002) https://doi.org/10.1117/12.473385

KEYWORDS: Statistical analysis, Computer simulations, Control systems, Internet, Analytical research, Detection and tracking algorithms, Linear filtering, Information science, Information technology

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Proceedings Article | 1 July 2002 Paper

Video streaming systems with cooperative caching mechanisms

Naoki Wakamiya, Masayuki Murata, Hideo Miyahara

Proceedings Volume 4862, (2002) https://doi.org/10.1117/12.473046

KEYWORDS: Video, Surface plasmons, Telecommunications, Internet, Local area networks, Data communications, Control systems, Video coding, Digital signal processing, Information science

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Proceedings Article | 9 August 2001 Paper

Incremental capacity dimensioning for reliable IP-over-WDM networks

Shin'ichi Arakawa, Masayuki Murata

Proceedings Volume 4599, (2001) https://doi.org/10.1117/12.436055

KEYWORDS: Wavelength division multiplexing networks, Internet, Wavelength division multiplexing, Probability theory, Reliability, Multimedia, Feedback control, Signal generators, Light wave propagation, Computer simulations

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Proceedings Article | 24 July 2001 Paper

Control theoretical analysis of a window-based flow control mechanism for TCP connections with different propagation delays

Hiroyuki Ohsaki, Keiichi Takagaki, Masayuki Murata

Proceedings Volume 4523, (2001) https://doi.org/10.1117/12.434310

KEYWORDS: Control systems, Computer simulations, Internet, Systems modeling, Error analysis, Analytical research, Heart, Performance modeling, Efficient operations, Network security

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Proceedings Article | 20 July 2001 Paper

Proxy caching mechanisms with video quality adjustment

Masahiro Sasabe, Naoki Wakamiya, Masayuki Murata, Hideo Miyahara

Proceedings Volume 4519, (2001) https://doi.org/10.1117/12.434278

KEYWORDS: Video, Multimedia, Internet, Linear filtering, Data storage, Systems modeling, Distortion, Quantization

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Proceedings Article | 2 February 2001 Paper

TCP-friendly video transfer

Naoki Wakamiya, Masayuki Murata, Hideo Miyahara

Proceedings Volume 4211, (2001) https://doi.org/10.1117/12.417490

KEYWORDS: Video, Video coding, Signal to noise ratio, Multimedia, Receivers, Networks, Internet, Quantization, Control systems, Computer simulations

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Proceedings Article | 22 September 2000 Paper

Path setup algorithms for uniform/nonuniform traffic in unidirectional optical compression TDM rings

Kazuhiro Gokyu, Ken-ichi Baba, Masayuki Murata

Proceedings Volume 4233, (2000) https://doi.org/10.1117/12.401810

KEYWORDS: Transmitters, Receivers, Algorithms, Aluminum, Time division multiplexing, Local area networks, Wavelength division multiplexing, Transceivers, Optical networks

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Proceedings Article | 22 September 2000 Paper

Design methods of multilayer survivability in IP over WDM networks

Shin'ichi Arakawa, Masayuki Murata, Hideo Miyahara

Proceedings Volume 4233, (2000) https://doi.org/10.1117/12.401827

KEYWORDS: Wavelength division multiplexing networks, Wavelength division multiplexing, Reliability, Nickel, Internet, Optical switching, Multimedia, Switches, Light emitting diodes

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Proceedings Article | 5 November 1999 Paper

Analysis and application of network traffic characteristics to design high-speed routers

Shingo Ata, Masayuki Murata, Hideo Miyahara

Proceedings Volume 3842, (1999) https://doi.org/10.1117/12.368312

KEYWORDS: Virtual colonoscopy, Statistical analysis, Switches, Switching, Internet, Analytical research, Adaptive control, Asynchronous transfer mode, Multimedia, Broadband telecommunications

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Proceedings Article | 18 August 1999 Paper

Performance evaluation of HTTP/TCP on asymmetric networks

Go Hasegawa, Masayuki Murata, Hideo Miyahara

Proceedings Volume 3841, (1999) https://doi.org/10.1117/12.360359

KEYWORDS: Internet, Bromine, Network architectures, Network security, Control systems, Data modeling, Lawrencium, Internet technology, Phase shifts, Image segmentation

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Proceedings Article | 7 October 1998 Paper

Performance evaluation of TCP over ABT protocols

Shingo Ata, Masayuki Murata, Hideo Miyahara

Proceedings Volume 3530, (1998) https://doi.org/10.1117/12.325885

KEYWORDS: Switches, Control systems, Asynchronous transfer mode, Data communications, Error control coding, Internet, Performance modeling, Video, Information technology, Network architectures

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Proceedings Article | 10 October 1997 Paper

Allocation of wavelength-convertible nodes and routing in all-optical networks

Hiroaki Harai, Masayuki Murata, Hideo Miyahara

Proceedings Volume 3230, (1997) https://doi.org/10.1117/12.290387

KEYWORDS: Lanthanum, Algorithm development, Switching, Optimization (mathematics), Optical networks, Radium, Optical switching, Signal processing, Network security, Barium

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Proceedings Article | 10 October 1997 Paper

Analysis and modeling of World Wide Web traffic for capacity dimensioning of Internet access lines

Masahiko Nabe, Masayuki Murata, Hideo Miyahara

Proceedings Volume 3231, (1997) https://doi.org/10.1117/12.290400

KEYWORDS: Internet, Statistical analysis, Video, Data modeling, Performance modeling, Analytical research, Copper, Motion analysis, Motion models

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Proceedings Article | 1 May 1990 Paper

Development of time-resolved microfluorimetry and its application to studies of cellular membranes

Akihiro Kusumi, Akihiko Tsuji, Masayuki Murata, Yasushi Sako, Satoshi Kagiwada, Tsuyoshi Hayakawa, Shun-ichi Ohnishi

Proceedings Volume 1204, (1990) https://doi.org/10.1117/12.17720

KEYWORDS: Luminescence, Molecules, Resolution enhancement technologies, Microscopes, Fusion energy, Biochemistry, Molecular spectroscopy, Calcium, Molecular lasers, Proteins

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For the purpose of gaining molecular information such as molecular distances and molecular motion under the fluorescence microscope, we have developed a time-resolved microfluorimetric method, a time-resolved fluorescence spectroscopic technique combined with the optical microscopy: the excitedstate lifetime of fluorescent molecules (about 1-20 nsec) in a small spot in a single living cell is measured under the microscope using a focussed pulsed laser beam as an excitation light source (0.5 micron spot diameter, (lambda)=365 nm, FWHH= 14 psec, 4 MHz repetition rate) and a synchroscan streak camera as a detector with time-resolution. A signal-to-noise ratio better than 100 was obtained for fluorescein labelled band 3 (1 label/band 3) in an area of 2.5 micron-diameter (containing 2x105 band 3) in a single erythrocyte ghost after signal accumulation for 50 sec. The time-resolved microfluorimetry has been applied to the studies of(l) the assembly mechanism ofcell adhesion protein (E-cadherin, a calcium-dependent cell adhesion receptor protein) at the site of cellcell contact in keratinocytes in culture and (2) endosome-endosome fusion in fibroblasts in culture. (1) Observation by video microscopy indicated that the calcium-induced assembly ofE-cadherin at the sites of cell contact takes place via lateral migration of cadherin in the plasma membrane of keratinocytes. Association of cadherin molecules at the molecular level has been assessed by observing the resonance energy transfer (RET) from fluorescein (donor) to reactive red 8 (acceptor), both attached to monoclonal IgG antibody specific to E-cadherin (Occurrence of RET would decrease the lifetime of the donor). The fluorescence lifetime decay data of fluorescein at various locations in cells indicated the occurrence ofRET only at the boundary region ofkeratinocytes in the high-calcium medium, suggesting that cadherin molecules form aggregates at the sites of cell contact, where they function as a cell adhesion molecule between two cells. (2) Quantitative observation of fusion of endosomes in single cultured cells (NIHI3T3) has been made. Our method is based on the observation of internal content mixing of endosomes by detecting RET between 7-nitrobenz-2-oxa- 1 ,3-diazol-4-yl (NBD)-labelled a2-macroglobulin (energy donor) and water-soluble sulforhodamine (energy acceptor), which are sequentially endocytosed by a cell. One of the most important characteristics of the fusion assay reported here is that it allows fast quantitative measurement (measuring time, 10-30 sec) of fusion of each endocytotic vesicle discernible under the fluorescence microscope. The excited-state lifetime of the donor in each endosome was measured (1.6 micron-diameter spot) in various parts of the cell. Acceleration of the fluorescence decay of the donor (occurence of RET) was detected, the extent of which increased with an increase of the incubation time with the acceptor. This result indicates the mixing of the energy donor with the acceptor in endosomes, showing that fusion between successively formed endosomes can take place in cells. Blocking of endosome acidification with NH4C1 failed to supress endosome fusion. The cells treated with cytochalasin D at concentrations sufficient to destroy the actin filaments did not show any indications of endosome fusion, suggesting that actin filaments are required for enconter and/or fusion processes of endosomes.

Showing 5 of 27 publications

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