ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
26.47
Showing 1-18 articles out of 18 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Hideki Sumiyoshi, Nobuyuki Yagi, Masahiro Shibata
    Type: Article
    Session ID: CE2002-16/ME2002-8
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have developed multimedia-report authoring system for new educational broadcasting services. The system provides video editing functions as a Web application. Students can exchange and present their opinion to other students over the Internet. This paper describes overview of multimedia-report authoring system functions and configuration.
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  • Hiroki SHIGEYOSHI, Kento MIYAOKU, Akihito AKUTSU, Yoshinobu TONOMURA
    Type: Article
    Session ID: CE2002-17/ME2002-9
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we propose the automatic contents classification method to reflect the user's interest. This method attempts to reflect the user's interest in the contents classification by positively using the information on the career of acquisition which contents were acquired or not acquired. And we assumed contents to be commercials of the television and confirmed behavior of the proposed method. As the results, it was confirmed that the proposed method was effective, and the problems for the evaluation and mounting became clear.
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  • Xinlei Wang, Kayo Suzuki, Hiroaki Ikeda, Akihiko Watabe, Kazumi Komiya
    Type: Article
    Session ID: CE2002-18/ME2002-10
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
  • [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Type: Article
    Session ID: CE2002-19/ME2002-11
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
  • Shingo FUJIMORI, Kazuyuki IKENOYA, Hideyuki ASADA
    Type: Article
    Session ID: CE2002-20/ME2002-12
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper describes the development of a protocol transfer module for universal serial bus interface version 2.0 (USB2.0) -to- IEEE 1394 interface using synchronous packet control for audio and video (AV) data streams. This protocol transfer module can easily transmit AV data streams from a personal computer (PC) embedded an USB2.0 interface port to a digital video camcorder (DVC) unless the AV data stream unsynchronizing between the USB2.0 and IEEE 1394 interfaces. This protocol transfer module is used for transmitting and editing AV data streams on PC's and AV consumer appliances standardized with IEEE 1394.
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  • Nobuhiko Kitawaki
    Type: Article
    Session ID: CE2002-21/ME2002-13
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Recently, IP telephony (VoIP) services operated by Internet Protocol are much expected to be introduced into commercial telecommunication networks. From view points of customer's protection and provider's competition, communications quality taking account of customer's opinion (that is perceptual QoS: Quality of Service) is requested for assessment, design and management of networks and terminals in IP telephony. End-to-end communications quality has been studied and standardized in SG12 under ITU (International Telecommunication Union). This paper describes current status of standardization in the ITU for subjective and objective quality assessment. End-to-end communications quality is rated by loudness rating (LR) in relation to opinion rating method (MOS). Other impairment factors in networks and terminals are individually defined based on opinion ratings. Then, this paper describes quality assessment for speech coding and packet loss for the individual impairment factors. Finally, this paper describes E-model as network planning tool for multi-quality factors compounded in IP telephony.
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  • Ken NAKAOKA, Masami KATO
    Type: Article
    Session ID: CE2002-22/ME2002-14
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Network conditions such as packet loss and delay jitters greatly affect the end-to-end speech quality of VoIP (Voice over IP). For this reason, it is necessary to clarify how these network conditions affect the speech quality, and to guarantee the speech quality by applying QoS (Quality of Service) management technology in network and VoIP terminals. This paper represents evaluation results of speech quality, which is measured by objective speech quality assessment "PESQ" (Perceptual Evaluation of Speech Quality) when the network conditions change. In addition to the PESQ score, this paper shows the MOS (Mean Opinion Score) which is derived from the subjective listening tests. This paper also discusses the correlation between PESQ and MOS, especially when the packet loss and delay jitters occur.
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  • Hiroyuki OOUCHI, Hajime SUGAWARA, Masao MASUGI
    Type: Article
    Session ID: CE2002-23/ME2002-15
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we evaluated a VoIP system and examined PSQM+ while changing the voice data length of IP packets on various packet loss and transmission jitter conditions in a real network. We proposed a new VoIP system that changed VoIP parameters like the voice data length in IP packets according to the dynamically changing network QoS conditions using evaluation results. This system achieves both high transmission efficiency and voice quality stability.
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  • Noriko KOMAKI, Naofumi AOKI, Tsuyoshi YAMAMOTO
    Type: Article
    Session ID: CE2002-24/ME2002-16
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Speech quality of VoIP is degraded by transmission errors such as packet loss that is inevitable in best-effort communications. We have studied how to decrease such degradation. This study investigated PWR (Pitch Waveform Replication) method that is employed as an error hiding technique. The previous version of PWR employs an interpolation where past speech data is only used. For the decrease of some artifacts such as echoic quality in the begging and end of phonation, this study has proposed a new version that takes account of an interpolation from future speech data. In order to shorten the delay of the pitch extraction from future speech data, the proposed method employs a template matching. From the experimental results of objective and subjective evaluation, it is indicated that the proposed method is potentially useful for the improvement of speech quality.
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  • Xiang Kong, Kenichi Mase
    Type: Article
    Session ID: CE2002-25/ME2002-17
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we propose an endpoint measurement based admission control (EMBAC) with dynamic routing, with which is executed in mesh networks. The basic idea of this admission control is, to use probe flows to measure two routes, which are direct route and one of the two-link routes between each VoIP call's originating-terminating node pair at the same time. Based on the probe flow's QoS evaluation, the node decides a route for call. We compare performance of direct routing , basic dynamic routing and advanced dynamic routing by using simulation. It is shown that an advanced dynamic routing with EMBAC works better to minimizing call blocking probability and packet loss rate than direct routing in the network.
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  • Hisato Kobayashi, Kenichi Mase
    Type: Article
    Session ID: CE2002-26/ME2002-18
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Admission control is required for satisfying QoS requirements in IP networks. Recently many researches report that end-point measurement-based admission control (EMBAC) is promising, because it does not request any signaling and functionality in routers, and thus is scalable. In this paper, we focus on an active end-point admission control and a passive end-point admission control. The former uses probe packets to measure network state. The latter does not use probe packets. We study probe packet interval in an active one, and a time required to measure packet loss rate in a passive one. We show that admission control performance depend on probe packet interval and monitoring time in active EMBAC. We also show that the optimal monitoring time is around 30sec in passive EMBAC.
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  • Yuji OIE, Kenji KAWAHARA
    Type: Article
    Session ID: CE2002-27/ME2002-19
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In the future Internet, Quality of Service (QoS) declared/required by various types of users should be guaranteed/provided. The routing decision is usually based only on the hop-counts on some source-destination path in the current Internet, so that congestion happens frequently at some bottle-neck links. It also occurs even if some control is done for provisioning QoS to each traffic/users. Thus, the routing decision should be based on QoS requirements from users as well as available bandwidth of links and utilization in routers, and Traffic Engineering (TE) is to utilize whole network resources effectively and to satisfy traffic oriented performance requirements. In this paper, we first examine QoS control mechanism such as IntServ and DIFF-SERV, and the relation it to TE. Next, we show the implementation schemes in the current Internet and by applying MPLS (Multi-protocol Label Switching). Furthermore, we introduce some papers that investigate and evaluate the performance of TE network and discuss some problems from an implementation point of view.
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  • Masaki TOKUHISA, Yoshiyuki CHIBA, Hiroyoshi MIWA, Shinya NOGAMI
    Type: Article
    Session ID: CE2002-28/ME2002-20
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The technological development about Photonic MLPS (Multi Protocol Label Switching) is progressing with advancement of optical communications technology. In this paper, we introduce about the design technology of Photonic MPLS networks. The target networks here are based on WDM(Wavelength Division Multiplexing) networks. Since the routers which have wavelength change function, and the routers which don't have are intermingled in these networks, the existing designing method of WDM network is inapplicable. Then, we explain in detail about the OLSP designing method in these Photonic MPLS networks.
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  • Masato UCHIDA
    Type: Article
    Session ID: CE2002-29/ME2002-21
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Extreme Value Theory (EVT) is devoted to the statistical behavior of the maxima or the exceedances over a high threshold. The theory was originally developed in hydrology, and has recentry been applied to risk management in the field of finance and insurance. In this paper, we discuss the applicability of EVT to traffic-data analysis. Especially, using the method of EVT, we analyze a data for link-usage rate calculated from MIB (Management Information Base), and discuss the acuracy of the analyzed results.
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  • Type: Appendix
    Pages App1-
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Appendix
    Pages App2-
    Published: July 11, 2002
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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