GB2427725A - Internet system for managing the resources and availability of application servers and media servers by a primary server. - Google Patents

Internet system for managing the resources and availability of application servers and media servers by a primary server. Download PDF

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Publication number
GB2427725A
GB2427725A GB0612529A GB0612529A GB2427725A GB 2427725 A GB2427725 A GB 2427725A GB 0612529 A GB0612529 A GB 0612529A GB 0612529 A GB0612529 A GB 0612529A GB 2427725 A GB2427725 A GB 2427725A
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United Kingdom
Prior art keywords
server
data
application servers
application
software program
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0612529A
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GB0612529D0 (en
Inventor
Fu-Sheng Chiu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERA Digital Media Co Ltd
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ERA Digital Media Co Ltd
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Filing date
Publication date
Application filed by ERA Digital Media Co Ltd filed Critical ERA Digital Media Co Ltd
Publication of GB0612529D0 publication Critical patent/GB0612529D0/en
Publication of GB2427725A publication Critical patent/GB2427725A/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
    • G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
    • G06F9/5027—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resource being a machine, e.g. CPUs, Servers, Terminals
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/101—Server selection for load balancing based on network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23103—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion using load balancing strategies, e.g. by placing or distributing content on different disks, different memories or different servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/239—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • H04N21/2393—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests involving handling client requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17336—Handling of requests in head-ends
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2209/00—Indexing scheme relating to G06F9/00
    • G06F2209/50—Indexing scheme relating to G06F9/50
    • G06F2209/504—Resource capping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/508—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement
    • H04L41/5096—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement wherein the managed service relates to distributed or central networked applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Software Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Strategic Management (AREA)
  • Primary Health Care (AREA)
  • General Business, Economics & Management (AREA)
  • Marketing (AREA)
  • Economics (AREA)
  • Tourism & Hospitality (AREA)
  • Computer Hardware Design (AREA)
  • General Health & Medical Sciences (AREA)
  • Human Resources & Organizations (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Information Transfer Between Computers (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Computer And Data Communications (AREA)

Abstract

Disclosed is an internet service system with a primary server for managing application servers coupled to it via a network. The primary server runs a program for detecting the availability and resource usage of the application servers. Each application server reports resource usage and availability to the main server program. The network has a plurality of user computers coupled to the application servers by the network, user computers sending data requests through the network and receiving response data. The network may have media server coupled to the primary server and the application servers, the media server having a data caching program for analyzing the data requests and caching a subset of the response data and at least one data storage device for caching the response data. Each application server may have user data management software for storing user data. The server program may have a resource allocation module for collecting usage data from the application servers and a connection transfer module for transferring a user connection from one server to another server when the usage data for the first server pasts a threshold. The system may have streaming management software on the application servers and the media server.

Description

* 2427725
DISTRIBUTED STREAMING SERVER
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an internet server. More specifically, the present invention discloses a multi-tier distributed internet service provider with streaming media management software, application services, and fail-over handoff management.
Description of the Prior Art
Traditionally, an internet service provider consisted of little more than a server with several modems attached to it. Referring to Fig. 1, a diagram of a prior-art internet service provider system 100, user computers I 301 32 used modems (not shown) to connect via phone lines 120122 to modems (not shown) inside the server 110. The server 110 connected to the rest of the internet 105 via a T-1 connection 108. This structure provided connections from the user computers 130-132 to the internet 105 for data such as images and text emails.
However, this system 100 was prone to a number of problems and limitations.
The number of connections was limited to the number of available modems in the server 110, and the server 110 was a single point of failure for all of the connections to the user computers 130-132. Moreover, usage habits of users have changed with the invention of streaming audio and video media data, as well as high-bandwidth peer-to-peer software for sharing data; the traditional internet service provider system 100 has no ability to analyze data in order to reduce the overall communications load, and has limited bandwidth because of limited connectivity to the outside internet,
I
resulting in slow service to users. Also, internet-based applications are being developed which will offload processing and programming from the user's computer to a centralized application server, and the traditional internet service provider system has no provisions for these applications.
Therefore there is need for an improved internet service provider structure which can manage server failure by transferring the user's connection to another server without cutting off the user's connection, which can increase data transfer speed through improved data management, and which can provide application management and execution services.
SUMMARY OF THE INVENTION
To achieve these and other advantages and in order to overcome the disadvantages of the conventional method in accordance with the purpose of the invention as embodied and broadly described herein, the present invention provides an internet service provider system with a multi-tier architecture to enable fail-over and load-based handoff management of user connections, and to provide application servers for executing and storing internet applications.
The present invention further provides for caching of user data to reduce bandwidth usage and to service data requests faster via a high-speed server.
These and other objectives of the present invention will become obvious to those of ordinary skill in the art after reading the following detailed description of preferred embodiments.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, Fig. 1 is a block diagram showing a prior art internet service provider system; Fig.2(a) is a block diagram illustrating an embodiment of an internet service provider system of the present invention; Fig.2(b) is a block diagram illustrating an embodiment of an internet service provider system of the present invention; and Fig.3 is a block diagram illustrating an embodiment of an internet service provider system of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Wherever possible, the same reference numbers are used in the drawings and the
description to refer to the same or like parts.
Please refer to Fig.2a, a block diagram illustrating an embodiment of an internet service provider system 200 of the present invention. A primary server 210 is coupled to application servers 211 -2 13 via high-speed network connections 241 -243 such as Ethernet or token ring, or optionally by dedicated lines. The primary server is coupled to the internet 105 by one or more dedicated lines I 08-I 09. The application servers are coupled to user computers 23 1-236 by high-speed network connections 22l-226 such as cable modem, frame relay, ADSL, iDSL, SDSL, and fixed wireless; and by legacy connections such as modem if necessary.
The application servers 211 -.2 13 store user applications for use by the user computers 23 l-236 and provide internet connections to the user computers via connections 221-224. In addition to handling regular user data traffic, each application server 21 12 13 sends a heartbeat signal to a monitor program on the primary server to signal that the particular application server is functioning. If a heartbeat signal is not received from a given application server in some given time period, the primary server attempts to communicate with that application server to determine whether that given application server is still functioning. If the primary server is unable to communicate with that given application server, the primary server then signals another application server to take over the connections to the user computers that were served by the given application server. Referring to Fig.2(b) in combination with Fig. 2(a), in the event that application server 212 of internet service provider system 201 were to suffer a failure such as a hardware failure, primary server 210 can instruct application servers 211,213 to take over the user connections 224-226 for user computers 234-.236. Thus the user does not lose connectivity and can continue to work. Connections can furthermore be allocated and reassigned depending on an appliáation server's CPU load, by client computer bandwidth usage, or by number of connections.
Please refer to Fig.3, a block diagram showing another embodiment of the internet service provider system 300 of the present invention. Fig. 3 shows the internet service provider system 200 of Fig.2 further comprising a main streaming server 310. This main streaming server 350 can serve other internet service providers 321-322 which can be similar in structure to internet service provider system 200.
Main streaming server 350 provides high bandwidth capacity to internet service providers 210,321,322 via high-bandwidth connections 31 03 12 for serving large amounts of data such as streaming audio and video media. Main streaming server 350 further provides caching of these large streaming data sets so that if multiple users want to download the same data, the main streaming server does not need to retrieve the same data twice from the external internet 105 over connection 308. These servers can also cache data that the user is serving, for example via a peer-topeer application such as Bittorrent, DC++, or other file sharing system. Additional main streaming servers can be added for redundancy and to provide additional bandwidth capacity. Through providing multiple layers of servers, streaming data can be buffered to provide a reliable stream of data for smooth audio or video playback without pauses or stalls. Each layer of servers can provide a buffer for a given stream, optimally ten to fifteen seconds of buffering time. Depth control allows for increasing or decreasing buffering time, controlling access delays by providing data on closer servers, and distributing the streaming data to route around bottlenecks, failures, and delays.
Application servers can further be used as internet data centers, to store user data for collaborative work, offsite backup, or for accessibility from any location.
This system thus provides a dramatic improvement over the limited prior art.
Connections are more reliable and data is served to the user more quickly. Depth control allows any level of desired service to be configured for and provided, while distributing streamed data and connections improves reliability for the users.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall I1 within the scope of the invention and its equivalent

Claims (17)

  1. What is claimed is: 1. An internet service system comprising: a primary server for managing a plurality of application servers; a network for coupling the plurality of application servers to the primary server; a server software program running on the primary server for detecting availability and resource usage on the plurality of application servers; an application software program running on each application server of the plurality of application servers to report resource usage and availability to the server software program; and a plurality of user computers coupled to the plurality of application servers by the network, said plurality of user computers sending a plurality of data requests through the network and receiving a plurality of response data.
  2. 2. The internet service system of claim 1 further comprising a media server coupled to the primary server and the application servers by the network, said media server comprising: a data caching software program for analyzing the plurality of data requests and caching a subset of the plurality of response data; and at least one data storage device for caching the subset of the plurality of response data.
  3. 3. The internet service system of claim 1, each application server further comprising: a user data management software program for storing user data; and at least one data storage device for storing the user data.
  4. 4. The internet service system of claim 1, the server software program further comprising: a resource allocation module for collecting a resource usage data from the plurality of application servers, said resource usage data comprising at least a CPU usage percentage, a network usage percentage, and an availability indicator; and a connection transfer module for transferring a user computer connection from a first application server of the plurality of application servers to a second application server of the plurality of application servers when the resource allocation module determines that the resource usage data from the first application server exceeds a threshold.
  5. 5. The internet service system of claim I further comprising a streaming management software program running on each application server of the plurality of application servers and on the media server, said streaming management software program comprising: an input module to accept a streaming media data stream as input; a buffering module to manage buffering levels of the streaming media data stream; a caching module to determine whether the streaming media data stream should be cached; and a storage module to store the streaming media data stream on the storage unit of the media server.
  6. 6. An internet service system comprising: a plurality of servers comprising a primary server, a plurality of media servers, and a plurality of application servers; a network for coupling the plurality of servers; a server software program running on the primary server for detecting availability and resource usage on the plurality of application servers; an application software program running on each application server of the plurality of application servers to report resource usage and availability to the server software program; and a plurality of user computers coupled to the plurality of application servers by the network, said plurality of user computers sending a plurality of data requests through the network and receiving a plurality of response data.
  7. 7. The internet service system of claim 6 further comprising a media server coupled to the primary server and the application servers by the network, said media server comprising: a data caching software program for analyzing the plurality of data requests and caching a subset of the plurality of response data; and at least one data storage device for caching the subset of the plurality of response data.
  8. 8. The internet service system of claim 6, each application server further comprising: a user data management software program for storing user data; and at least one data storage device for storing the user data.
  9. 9. The internet service system of claim 6, server software program further comprising: a resource allocation module for collecting a resource usage data from the plurality of application servers, said resource usage data comprising at least a CPU usage percentage, a network usage percentage, and an availability indicator; and a connection transfer module for transferring a user computer connection from a first application server of the plurality of application servers to a second application server of the plurality of application servers when the resource allocation module determines that the resource usage data from the first application server exceeds a threshold.
  10. 10. The internet service system of claim 6 further comprising a streaming management software program running on each application server of the plurality of application servers and on the media server, said streaming management software program comprising: an input module to accept a streaming media data stream as input; a buffering module to manage buffering levels of the streaming media data stream; a caching module to determine whether the streaming media data stream should be cached; and a storage module to store the streaming media data stream on the storage unit of the media server.
  11. ii. An internet service system comprising: a primary server for managing a plurality of application servers; a network for coupling the plurality of application servers to the primary server; a server software program running on the primary server for detecting availability and resource usage on the plurality of application servers; and an application software program running on each application server of the plurality of application servers to report resource usage and availability to the server software program.
  12. 12. The internet service system of claim 11, further comprising: a plurality of user computers coupled to the plurality of application servers by the network, said plurality of user computers sending a plurality of data requests through the network and receiving a plurality of response data.
  13. 13. The internet service system of claim 11 further comprising a media server coupled to the primary server and the application servers by the network, said media server comprising: a data caching software program for analyzing the plurality of data requests and caching a subset of the plurality of response data; and at least one data storage device for caching the subset of the plurality of response data.
  14. 14. The internet service system of claim ii, each application server further comprising: a user data management software program for storing user data; and at least one data storage device for storing the user data.
  15. 15. The internet service system of claim 11, the server software program further comprising: a resource allocation module for collecting a resource usage data from the plurality of application servers, said resource usage data comprising at least a CPU usage percentage, a network usage percentage, and an availability indicator; and a connection transfer module for transferring a user computer connection from a first application server of the plurality of application servers to a second application server of the plurality of application servers when the resource allocation module determines that the resource usage data from the first application server exceeds a threshold.
  16. 16. The internet service system of claim 11 further comprising a streaming management software program running on each application server of the plurality of application servers and on the media server, said streaming management software program comprising: an input module to accept a streaming media data stream as input; a buffering module to manage buffering levels of the streaming media data stream; a caching module to determine whether the streaming media data stream should be cached; and a storage module to store the streaming media data stream on the storage unit of the media server.
  17. 17. An intenet service system substantially as described herein with reference to the drawings.
GB0612529A 2005-06-24 2006-06-23 Internet system for managing the resources and availability of application servers and media servers by a primary server. Withdrawn GB2427725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94121247A TWI314823B (en) 2005-06-24 2005-06-24 Distributed streaming server

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GB0612529D0 GB0612529D0 (en) 2006-08-02
GB2427725A true GB2427725A (en) 2007-01-03

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KR (1) KR20060135565A (en)
GB (1) GB2427725A (en)
TW (1) TWI314823B (en)

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EP2261800A1 (en) * 2009-06-10 2010-12-15 Siemens Aktiengesellschaft Multi instance virtual server
EP2418848A1 (en) * 2009-04-10 2012-02-15 ZTE Corporation Content location method and content delivery network node
EP2685693A1 (en) * 2011-03-09 2014-01-15 Computer Network Information Center, Chinese Academy of Sciences Method for gathering queue information and job information in computation environment

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JP5576809B2 (en) * 2011-01-19 2014-08-20 日本放送協会 Key management device, signature key update partial key generation device, signature key issuing device, application server and receiving terminal, and control program thereof

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US20010039586A1 (en) * 1999-12-06 2001-11-08 Leonard Primak System and method for dynamic content routing
US6757796B1 (en) * 2000-05-15 2004-06-29 Lucent Technologies Inc. Method and system for caching streaming live broadcasts transmitted over a network

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US5539883A (en) * 1991-10-31 1996-07-23 International Business Machines Corporation Load balancing of network by maintaining in each computer information regarding current load on the computer and load on some other computers in the network
WO2000022526A1 (en) * 1998-10-09 2000-04-20 International Business Machines Corporation Load balancing cooperating cache servers
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2418848A1 (en) * 2009-04-10 2012-02-15 ZTE Corporation Content location method and content delivery network node
EP2418848A4 (en) * 2009-04-10 2013-09-25 Zte Corp Content location method and content delivery network node
US9584870B2 (en) 2009-04-10 2017-02-28 Zte Corporation Content locating method and content delivery network node
EP2261800A1 (en) * 2009-06-10 2010-12-15 Siemens Aktiengesellschaft Multi instance virtual server
EP2685693A1 (en) * 2011-03-09 2014-01-15 Computer Network Information Center, Chinese Academy of Sciences Method for gathering queue information and job information in computation environment
EP2685693A4 (en) * 2011-03-09 2014-05-07 Computer Network Inf Ct Cas Method for gathering queue information and job information in computation environment

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TWI314823B (en) 2009-09-11
GB0612529D0 (en) 2006-08-02
JP2007006445A (en) 2007-01-11
TW200701705A (en) 2007-01-01
KR20060135565A (en) 2006-12-29

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