金田の論文

Kanada, Y., Ikezawa, M., Miyake, S., and Atarashi, Y., draft-kanada-diffserv-qospifmib-00.txt, Internet Draft, November 1999.

[ Local textual version ]
[ Slides used in 46th IETF: Configuration Management BOF, Diffserv WG, and RAP WG (not recommended) ]

要約: This document describes a QoS PIF MIB (Quality-of-Service Programming-Interface Management-Information-Base) to be used as an SNMP-based programming interface for routers. This MIB is intended to be a programming interface for router QoS functions, especially DiffServ-related [RFC2475] functions including packet scheduling (queuing), dropping, and metering that must be modular and concisely described. Traffic-conditioning rules and metering rules for DiffServ-related functions are defined modularly by using "virtual flow labels" and exclusive conditions in rules, and new classifications for packet-scheduling and packet-dropping functions are introduced. This document focuses on satisfying the requirements on programming interfaces or programming languages for router control. Thus, the focus is different from that of DiffServ MIB [DSMIB] or QoS PIB [QoSPIB].

金田 泰, 電子情報通信学会 ネットワーキング・アーキテクチャ・ワークショップ 10 周年記念大会, pp. 106-113, IEICE, 2000.

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要約: To realize internet-protocol-based QoS-assured networks, using differentiated services under policy-based networking is a promising approach. A QoS policy server must work in multi-vendor environment. To use standard protocol, such as COPS or SNMP, between the policy server and routers is not sufficient, but also to define and to standardize high-level syntax and semantics, i.e., a language, is required for interoperability. This paper describes the outline of a rule-based language for this purpose. Policy rules can be defined in the policy server and can be deployed to routers or router proxies using this language through an appropriate protocol such as COPS, SNMP, or IIOP. The language consists of several types of rules, i.e., matching, policing (or metering), marking, discarding, and scheduling types, and linkage labels that connects rules. A MIB and/or PIB that simulates the language is also explained in this paper. The language will be implemented in near future.

Kanada, Y., International Workshop on Quality of Service 2000 (IWQoS 2000), pp. 161-163, June 2000.

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要約: Network node functions, such as QoS or the security functions of routers, are becoming increasingly complex, so programs, not only configuration parameters, are required to control network nodes. In a policy-based network, a policy is defined at a policy server as a set of rules that deployed at network nodes where it must be translated into an executable program or parameters. Thus, a policy must be represented by a form in which the syntax and semantics are clearly defined, and which can be mechanically translated into an executable program. This is possible if the policy is written in an appropriate rule-based programming language. This paper describes such a language in which functions required for DiffServ can be specified for the interface between a policy server and network nodes. In this language, a policy rule can be composed using predefined primitive building blocks and control structures.

Kanada, Y., 2nd International Working Conference on Active Networks (IWAN 2000), Lecture Notes in Computer Science, No. 1942, pp. 195-210, Springer, October 2000.

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要約: Policy-based networks can be customized by users by injecting programs called policies into the network nodes. So if general-purpose functions can be specified in a policy-based network, the network can be regarded as an active network in the wider sense. In a policy-based network, two or more policies must often cooperate to provide a high-level function or policy. To support such building-block policies, two architectures for modeling a set of policies have been developed: pipe-connection architecture and label-connection architecture. It is shown that rule-based building blocks are better for policy-based network control and that the label-connection architecture is currently better. However, the pipe-connection architecture is better in regards to parallelism, which is very important in network environments.

金田 泰, 電子情報通信学会 情報ネットワーク (IN) 研究会, 信学技法, 100-378, IN 2000-102, pp. 47-54, 2000-10.

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要約: ポリシーベース・ネットワークにおいては，高水準の機能あるいはポリシーを 実現するためにしばしば 2 個以上の低水準のポリシーをくみあわせる必要がある． このような部品化されたポリシーをサポートするために，複数のポリシーを モデル化するための 2 つのアーキテクチャを開発した． それらはパイプ結合 アーキテクチャとラベル結合アーキテクチャである． 規則ベースの部品が ポリシーベース・ネットワーク制御にとってすぐれていること，そして ラベル結合アーキテクチャが現在のところはよりよいことがわかった． しかし， また，ネットワーク環境においては非常に重要な並列性という点においては パイプ結合アーキテクチャのほうがすぐれていることがわかった．

Kanada, Y., Workshop on Policies for Distributed Systems and Networks (Policy 2001), Lecture Notes in Computer Science, No. 1995, Springer, pp. 171-184, January 2001.

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要約: To control complicated and decomposable networking functions, such as Diffserv, two or more policies must cooperate. Combining two or more mutually dependent policies for a specific purpose is called policy combination. Methods of passing information between combined policies can be classified into real tags and virtual tags, or labels and attributes. Policy combinations can be classified into concatenation, parallel application, selection, and repetition. Explicitly specifying policy combinations makes policy systems semantically clearer and better suited to general use, extends the range of functionality, and improves the possibility of optimization. If policy combinations can be specified in a policy system, two types of policy organizations can be distinguished: homogeneous and heterogeneous. Heterogeneous organization is more service-oriented and seems to meet service-management requirements, but homogeneous organization is more device-oriented and may provide better performance.

Kanada, Y., 7th IFIP/IEEE International Symposium on Integrated Network Management (IM 2001), pp. 545-560, May 2001.

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要約: Because higher- and lower-level policies do not necessarily correspond one to one, a higher-level network policy may have to be translated into two or more lower-level policies, and two or more cooperating higher-level policies may have to be translated into one lower-level policy. The former transformation is called a policy division, and the latter transformation is called a policy fusion. These transformations can be performed mechanically under restricted conditions as described in this paper. However, in general, they are very complicated and the restrictions cannot be eliminated completely mainly because of existence of multiple packet classifiers in a set of policies. Thus, this paper concludes that they should not be introduced if it is possible. The policy division and fusion can be avoided in certain cases, but they will not probably be able to be avoided in general. If so, the problem should be solved or relaxed by removing harmful classifiers by introducing virtual flow labels and by further studies. In addition, we may have to find a better method to control network devices than policies in the current sense.

Kanada, Y. and O'Keefe, B. J., Asia-Pacific Network Operations and Management Symposium 2001 (APNOMS 2001), September 2001, (poster paper, presentation cancelled).

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要約: Policies sometimes have to be combined and applied in cooperation to represent such programmable and customizable network functions as Diffserv. In the OpenView PolicyXpert and JP1/PolicyXpert policy servers, three types of policies and three types of virtual flow labels, to connect the policy rules, are defined for Diffserv. The combination of these policies allows the representation of complex Diffserv policies and the separation of service and subscriber policies. Diffserv policies and virtual flow labels make this possible. However, the careful design of Diffserv policies has enabled simple Diffserv policies to be represented in a simple form.

金田　泰，ブライアン・オキーフ, 電子情報通信学会 情報ネットワーク・ネットワークシステム 合同研究会，2002-3.

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要約: ネットワークのポリシー制御において，Diffserv のようなプログラムし カスタマイズすることが可能なネットワーク機能を表現するために， 複数のポリシーをくみあわせる必要が生じることがある． PolicyXpert というポリシーサーバにおいて，3 種類のポリシーと，ポリシーを接続するための 3 種類の仮想フローラベル (VFL) とを設計・実装した．ポリシーのくみあわせに よって複雑な Diffserv ポリシーが表現可能になる． また，ポリシーをくみあわせる ことにより，DSCP にもとづくサービスクラスのサブクラスの定義が可能になり， サービスポリシーと加入者ポリシーとの分離が可能になっている． しかも， Diffserv ポリシーを慎重に設計したため，単純な Diffserv ポリシーは単純な かたちであらわせるようになった．

金田 泰, 電子情報通信学会 2002 年総合大会，2002-3.

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要約: (なし)

Kanada, Y., and Yazaki, T., Communications Quality and Reliability 2002 (CQR 2002), pp. 12-16 2002.

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要約: In policy-based networks, two or more policies often have to cooperate because combined and customized network functions must be controlled using policies. Two types of policy trans-formation, policy fusion and policy division, are sometimes required to implement cooperating policy systems on high-performance hardware routers. Policy fusion transforms two or more policies into one, and policy division transforms a policy into two or more policies. These transformations causes a problem that the original policies must usually be strongly constrained to allow these transformations. This paper shows a method for resolving restrictions on the division of QoS policies by a software-hardware integration, i.e., by implementing virtual flow labels (flow IDs) in hardware and by dividing a policy and deploying the policies onto two filter blocks. We have developed a policy agent (PEP) and a gigabit router integrated by using this method. Both high-performance and flexibility are achieved by this integration.

Kanada, Y., 3rd International Workshop on Policies for Distributed Systems and Networks (Policy 2002), pp. 236-239, June 2002.

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要約: This paper proposes a method, called the policy-extension-by-policy method, for quickly and dynamically adding policy classes with new functionality to policy servers and agents. In this method, users can add a new policy class to the policy server by using policy-definition (PD) policies, and they can define a method to translate a policy of the new class and to send to network nodes of different vendors through various types of device interfaces, such as CLI, MIBs, PIBs, APIs or hardware tables, by using policy-embedding (PE) policies. A PE policy also enables translating a policy of an existing class and sending the result to a new type of network node. PE policies contain command templates and methods for filling the templates. A program interpreter is embedded in policy agents to make flexible policy-to-configuration translation possible. A prototype system and example policies, i.e., access control, Diffserv, and VPN policies, were developed.

Kanada, Y. and O'Keefe, B. J., Journal of Network and Systems Management, Vol. 11, No. 3, pp. 253-275, 2003.

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要約: We developed two rule-based building-block architectures, i.e., pipe-connection and label-connection architectures, for describing complex and structured policies, especially network QoS policies. The latter is focused on in this study. The relationships or connec-tions between building blocks are specified by the da-taflow and control flow between them. The dataflow is specified by tags, including virtual flow labels (VFLs), which are data attached to "outside packets". The con-trol flow can be classified and specified by four control structures: concatenation, parallel application, selection, and repetition. We have designed fine-grained and coarse-grained building blocks and methods for specify-ing dataflow and control flow in differentiated services (Diffserv), and implemented the coarse-grained ones in a policy server. Two cases of building-block use are de-scribed, and we concluded that there are five advantages of building-block-based policies, i.e., expressibility, uni-form semantics, simplicity, flexibility, and management-task-oriented design. We also developed techniques for transforming building-block policies into executable ones, which are called policy division and fusion.

金田 泰, 電子情報通信学会 マルチメディアと仮想環境研究会, 2003-10.

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要約: 電話にかわるべきコミュニケーション・メディア voiscape の概念を提案する． Voiscape は，3 次元オーディオ技術による仮想的な "音の部屋" をユーザ間で共有し，そのなかを自由に移動してさまざまなひとと会ったり わかれたりしながら多者間のコミュニケーションがおこなえるウェアラブルな メディアである． プレゼンスや周縁的情報の伝達を可能にし，電話におけるような 1 対 1 の会話から従来のメディアではできなかったさまざまなかたちの コミュニケーションまでをカバーすることによって，つながり感・安心感の 共有や暗黙知の共有も実現されるだろう． この論文では voiscape の使用場面や 手順についてのべ，PC 上に開発した voiscape のプロトタイプについてものべる． プロトタイプ上ではユーザは前方の様子を 3 次元グラフィクスによって 確認しながらマウスをつかって部屋内を移動することができる．

金田 泰, 電子情報通信学会 インターネットアーキテクチャ研究会, 2003-10.

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要約: 電話にかわるべき音声コミュニケーション・メディアの確立をめざした研究の 一部として，多者間通信が可能な常時接続型コミュニケーショ ン・メディア voiscape のアーキテクチャとプロトタイプを開発した． Voiscape においては 3 次元オーディオ技術によってつくられた仮想的な "音の部屋" を使用する． ユーザがマウスをつかって音の部屋内を移動すると，プレゼンスサーバを介して 部屋内の位置などのプレゼンス情報が部屋内の他のユーザにつたえられる． 相手にちかづいたり相手からとおざかったりすると，あらかじめ端末において 定義されたポリシーにしたがって，SIP を使用して自動的に通信セッションの 開始・終了などの動作がとられる． このポリシーベース・セッション制御に よってプライバシー保護や通信量削減が可能になる． 接続開始を要求する際に 相手からも同時に接続開始を要求されることが頻繁におこりうるので， 2 重に接続したり "話し中" になったりせずに接続が確立する方法を くふうしている．

金田 泰, 情報処理学会 マルチメディア通信と分散処理研究会, 2004-3.

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要約: 電話にかわるべき音声コミュニケーション・メディア voiscape の確立をめざし て研究をおこなっている． Voiscape においては 3 次元オーディオ技術によっ てつくられた仮想的な "音の部屋" を使用するが，音声通信と 3 次元音声にく わえて 3 次元グラフィクスを使用するプロトタイプを PC 上に開発した． この プロトタイプにおいては音声のキャプチャと通信のために JMF (Java Media Framework)，3 次元音声 / グラフィクスのために Java 3D を使用した． 開発 前はこれらの API をつなげば必要な基本機能がほぼ実現できるとかんがえてい たが，実際にはこれらを直接つなぐことはできず，3 次元音声のためには Java 3D のインタフェースをとおして OpenAL を使用した． また，プロトタイプにお いては音質劣化や遅延などの問題を容易に解決することができなかったが，試行 をかさねてこれらの問題をほぼ解決した．

Kanada, Y., 2nd IASTED International Conference on Communication and Computer Networks (CCN 2004), 2004-11.

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要約: A new voice communication medium, which the author calls "voiscape", will probably appear in near future. Voiscape shall have much improved user interface than the conventional voice communication systems, i.e., telephone and conference systems, and be based on the IP-based conferencing and spatial audio technologies. The author has developed a prototype toward voiscape, which has made a step toward solving two problems of the conventional systems i.e., complicated and restricted conference control and lack of crossed-over multi-context support, by introducing two features. The first function is the virtual-location based communication; i.e., the users can talk with other users and move, in a way similar to face-to-face conversation, in a virtual auditory space created by spatial audio technology without explicit session and floor control. The second function is personalized policy-based communication control; i.e., the users can specify communication policies that protects their privacy and reduce required resources. This function is enabled by a distributed policy-arbitration mechanism. Experiments showed that the basic mechanisms and the policy-based control with a simple policy worked well.

Kanada, Y., 15th ACM International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV 2005), pp. 45-50, June 2005.

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要約: An improved prototype of the "voiscape" voice communication medium has been developed and subjectively evaluated. Voiscape enables natural and seamless voice communication by using sound to create a virtual "sound room" in which people, who are repre-sented by different sounds, can move freely. It features low-delay motion-tracking spatial audio with simulated early reflections that produce out-of-head sound localization and sound distance expression. It also features virtual-location-based selective communication: a user can walk freely in the sound room using a map- and cursor-key-based user-interface and can select whom to talk to or which sound sources to listen to. A third feature is SIP-presence-event-notification (SIMPLE)-based sound room management: when users move, their locations and directions are distributed using SIP SUBSCRIBE/NOTIFY messages. The combination of these features creates a natural voice-communication space in which two or more parallel conversation contexts can coexist. Limited, subjective testing by around 200 people showed that this medium can be used for cocktail-party-like conversation; i.e., users could distinguish parallel conversations by paying attention to or by moving toward one of them.

金田 泰, 電子情報通信学会 応用音響研究会, 2005-6.

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要約: 3D 音響技術によってつくられた仮想的な "音室" 内を移動して相手を選択しつつ 会話ができるコミュニケーション・メディア voiscape を開発している． Voiscape の第 2 のプロトタイプ VPII においては，FIR 法によって低遅延な HRTF フィルタ計算をおこなうとともに，移動可能な範囲としての音室を 音響計算上の部屋とみなし，その壁による初期反射をシミュレートした． この初期反射によって音の頭外定位と距離感の表現を可能にした． また，ユーザの移動を追跡し必要な補間処理をおこなった． これによって，話者識別が容易で，複数の会話コンテクストが共存することができ， また音室内の移動が自然でノイズがすくない音声コミュニケーション環境を実現した．

Kanada, Y., Asia-Pacific Network Operations and Management Symposium 2005 (APNOMS 2005), September 2005.

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要約: A method for conference-room management for an auditory-virtual-space-based voice-communication medium called voiscape and a voice-communication system prototype called VPII, which used this method, were developed. With this method, conference rooms (called sound rooms) are managed through SIP and SIMPLE (a presence-related event-notification mechanism). A user can not only obtain a room list and enter (select) or exit from a room, but can also create, modify, or delete rooms by SIMPLE messaging. Rooms, users, and objects are managed by their "soft state"; i.e., they are deleted when a time out occurs. Users are informed of room membership, presence of a user, e.g., location and direction in the room, and presence of an object in the room by SIMPLE messaging, i.e., by SUBSCRIBE, NOIFY, and PUBLISH requests. To reduce the messaging overhead, the partial notification mechanism of SIMPLE is used in VPII.

Kanada, Y., 13th ACM International Conference on Multimedia, pp. 794-795, November 2005.

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要約: We are developing a new voice communication medium called voiscape. Voiscape enables natural and seamless bi-directional voice communication by using sound to create a virtual sound room. In a sound room, people can feel others' direction and distance expressed by spatial sounds with reverberations, and they can move freely by using a map of the room. Voiscape enables multi-voice-conversations. In a virtual market place that will be realized by voiscape, people can not only buy goods or information but also enjoy talking with merchants and people there. In this demo, a voiscape prototype called VPII is used for realizing such an environment. Unfortunately, because prerecorded voices are used in this demo, the participants cannot talk with merchants. However, the participants can talk each other with small end-to-end latency (less than 200 ms) and will feel the atmosphere of the virtual market place. Prerecorded people and merchants talk each other in English, Japanese and Chinese in parallel and with crossovers, and participants can virtually walk among them and can selectively listen one voice or hear multiple voices at once.