A FAULT DETECTION AND RECOVERY SYSTEM FOR

DOORAE RUNNING ON HOME NETWORK ENVIRONMENT

SoonGohn Kim and Eung Nam Ko

Division of Computer & Game Science, Joongbu University, 101 Daehakro, Chubu-meon, Gumsangun

Chungnam, 312-702, Korea

Division of Information & Communication, Baekseok University, 115, Anseo-dong

Cheonan, Chungnam, 330-704, Korea

Keywords: FDRS, Home Network, DOORAE, Fault Detection and Recovery System, Software Error.

Abstract: We propose FDRS (Fault Detection and Recovery System) for DOORAE running on home network

environment). DOORAE (Distance Object Oriented collaboRAtion Environment) is a framework of

supporting development on multimedia applications for computer-based collaborative works running on

home network. FDRS is a system which is suitable for detecting and recovering software error based on

distributed multimedia education environment by using software techniques. The purpose of FDRS is to

recover application software running on DooRae automatically and repeatedly. All application software

running on DooRae returns to a healthy state or at least an acceptable state.

1 INTRODUCTION

Nowadays, the use of universal multimedia

standards and improvements in processor technology

has led to much more powerful systems at lower

costs. The development of communication

environment based on such technology as graphics,

image, voice and video has become the media for

interactive information services. These features have

made multimedia distant education feasible (

Gil C.

Park, and Dae J. Hwang., 1996) ( Gil C. Park, and Dae J.

Hwang.,

1997) ( Jung S. Sung, and Dae J. Hwang., 1996 ).

Distant education system must be able to support

real-time interaction, temporal/spatial

synchronization and floor control for smooth

interaction (

Seok S.Kim et al., 1997) ( Jae Y. Ahn et al.,

1996)( Gil C. Park and Dae J. Hwang., 1995). DooRae

provides several functions and features capable of

developing multimedia distant education systems

for students as well as teachers. It includes session

management, access control, concurrency control

and handling of late comers.

The field of fault-tolerant computing has evolved

over the past twenty-five years. Fault-tolerant

computing begins with the assumption that digital

systems are susceptible to many kinds of failure

(

Victor P. Nelson and Bill D. Carroll. Chap.1). In spite of

this current trend, however, study on fault-tolerance

of application software has not actually been

enough. Generally, fault-tolerance system can be

classified into software techniques, hardware

techniques and composite techniques (

Dhiraj K.

Pradhan., 1996

). The tolerance of software faults is in

most cases more difficult than dealing with hardware

faults since most software-fault mechanisms are not

well understood and do not lend themselves readily

to “nice” techniques such as error coding (

Victor P.

Nelson and Bill D. Carroll. Chap.5).

FDRS is a system in which a fault-tolerant

system running on DooRae. The system is capable

of detecting and recovering software error based on

Multimedia collaboration. This paper shows a design

of the agents which can detect an error and recover

it automatically by using API (Application Program

Interface) functions in MS-windows XP on the

distributed system.

Section 2 describes related works: home

network. Section 3 denotes Doorae agent layer

running on home network. Section 4 denotes FDRS.

Section 5 describes the evaluation of FDRS. Section

6 concludes the paper.

143

Kim S. and Nam Ko E. (2010).

A FAULT DETECTION AND RECOVERY SYSTEM FOR DOORAE RUNNING ON HOME NETWORK ENVIRONMENT.

In Proceedings of the 12th International Conference on Enterprise Information Systems - Software Agents and Internet Computing, pages 143-146

DOI: 10.5220/0002898901430146

 SciTePress

2 RELATED WORKS: HOME

NETWORK

A Physical device & network layer for home

network are as shown in Figure 1. The

communication network is being presently

developed with UDP broadcasting in order to

decrease communication rate and TCP/IP on the

Ethernet and ATM. The hardware environment of

DOORAE consists of multimedia PCs, a network

adapter, keyboard/mouse, image scanner,

microphone, video camera, monitor, speaker,

printer, video processor and accelerators. The

operating system was first developed on windows

95, but presently Windows 98, Windows NT and

Windows XP are supporting the development as

well. The multimedia application layer includes

general application software such as word

processors, spreadsheets, presentation tools and so

on.

Network

Utilization

of Event

& Pointe

Application

Sharing

Distribute

External

Network

Internal

Networ

Data

Transmission

pplication

Sharing

Homegateway

HomeServer

Data

Transmission

by Application

Sharing

Network

Utilization

of Event

& Pointe

Application

Sharing

Distribute

External

Network

Internal

Networ

Data

Transmission

pplication

Sharing

Homegateway

HomeServer

Data

Transmission

by Application

Sharing

Network

Utilization

of Event

& Pointer

pplication

Sharing

Distributer

External

Network

Internal

Network

Data

Transmission

pplication

Sharing

Homegateway

HomeServer

Data

Transmission

by Application

Sharing

Figure 1: A Physical device & network layer for Home

Network.

3 DOORAE AGENT LAYER

RUNNING ON HOME

NETWORK

DOORAE agent layer includes many agents. They

are AMA (Application Management Agent),

IA(Intelligent Agent), SMA (Session Management

Agent), ACA (Access Control Agent), MCA (Media

Control Agent) and FTA (Fault Tolerance Agent).

The organization of DOORAE agent layer running

on Home Network is shown in Figure 2.

AMA (Application Management Agent) consists of

various subclass modules. These subclass modules

provide the basic agent, while AMA supports a

mixture of various basic services. AMA includes

creation/deletion of shared video window and

creation/deletion of shared window. For providing

heterogeneous platforms with interoperability, it is

necessary to share media data and to furnish

awareness to the remote users involved in

collaborative work. To solve the problem, we set the

IA (Intelligent Agent) that modifies the transmitting

packets by using TCP/ IP or UDP. Event messages

including information about shared objects is by

passed among the homogeneous. SMA (Session

Management Agent) controls the access to the whole

session. This agent can be used in meeting, distance

learning, playing games and development of any

software. Session control also facilitates access and

limits it to the whole session. ACA (Access Control

Agent) controls the person who can talk, and the

one who can change the information. The

mechanism of floor control consists of

brainstorming, priority, mediated, token-passing

and time-out. MCA (Media Control Agent) support

convenient application using DOORAE

environment. Supplied services are the creation and

deletion of the service object for media use, and

media share between the remote users. This agent

limits the service by hardware constraint.

Multimedia Application Layer

System Layer

Communication

Layer

(home Network)

Communication

Layer

(home Network)

Multimedia Application Layer

System Layer

Communication

Layer

(home Network)

Communication

Layer

(home Network)

Figure 2: The Architecture of DOORAE Agent Layer

Based on Home Network.

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144

4 FDRS FOR DOORAE RUNNING

ON HOME NETWORK

This paper describes FDRS. It is a fault-tolerant

system for DOORAE running on Home Network.

4.1 The Organization of FDRS

As shown in Figure3, you can see the message flows

in relationship between FDRS and the application

software. It consists of a user, FDRS and the

watched application software.

request/command fault/detection

status/result information fault/recovery

request/command fault/detection

status/result information fault/recovery

request/command fault/detection

status/result information fault/recovery

request/command fault/detection

status/result information fault/recovery

Figure 3: The relationship between FDRS and application

software.

FDRS consist of FDRA (Fault Detection and

Recovery Agent), UIA (User Interface Agent) and

SMA (Session Management Agent). As shown in

Figure4, you can see the message flows in

organization of FDRS. UIA is an agent which plays

a role as an interface to interact between the user and

FDRA. UIA is a module in FDRS. UIA has

functions which receive user’s requirement and

provide the results for the user. SMA is a agent

which plays a role in connection of UIA and FDRA

and as management for the whole information. SMA

consists of GSM (Global Session Manager),

Daemon, LSM (Local Session Manager) and PSM

(Participant Session Manager).

Figure 4: The organization of FDRS.

4.2 The Algorithm of FDRS

Session management can create the sequence below

and you can see the message flow in Figure 5.

GSM

Local

Daemon

Application

LSM

Remote

Daemon

SMA

GSM

Local

Daemon

Application

LSM

Remote

Daemon

SMA

Figure 5: The relationship between GSM, Daemon and

LSM.

FDRA is a agent which plays a role in detecting

error and recovering it. That is, FDRA becomes

aware of error occurrence after it receives

requirement of UIA. FDRA informs SMA of the

results of detected errors. Also, FDRA activates a

fault application software automatically. It informs

SMA of the result again.

5 THE EVALUATION OF FDRS

FDRS has been implemented by using VISUAL

C++. The merit of FDRS is convenient to detect and

repair autonomously in comparison with manual

methods. But, its defect is overload by polling

method when detecting whether an error exists or

not. As shown in Table 1, conventional multimedia

distance education systems are Shastra, MERMAID,

MMconf, and CECED (A. Anupam and C.L.Bajai,

1993) (T. Ohmori and K. Watabe, 1992) (Torrence

Crowley and Raymond Tomlinson, 1990) (Earl

Craighill and Keith Skinner, 1993). You can see the

characteristic function of each system function for

multimedia distance education.

A FAULT DETECTION AND RECOVERY SYSTEM FOR DOORAE RUNNING ON HOME NETWORK

ENVIRONMENT

145

Table 1: Analysis of conventional multimedia distance

education system.

Function Sha-

Stra

MER-

MAID

MM-

conf

CE-

CED

OS UNIX UNIX UNIX UNIX

Development

Location

Purdue

Univ.

USA

NEC,

JAPAN

Cam-

Bridge

USA

SRI,

Inter-

national

Development

Year

1994 1990 1990 1993

Structure Server

/client

Server

/client

Cent-

ralized

Repli-

cated

Repli-

cated

FDRS based

Home

Network

No No No No

6 CONCLUSIONS

Multimedia has been applied to various fields since

the 1980s. A distant education system, a region of

the education field has also been in process of

development. The focus of distribute environment

for development of multimedia communication has

increased. A distributed system has a good condition

of design on fault-tolerant systems because it does

not affect the total system, though it occurs in defect

of a node or resource. Therefore, it is important to

increase the detecting capability required and be able

to recover the defect automatically without the need

for manual network management. This paper

explains the design of the FDRS (A Fault Detection

and Recovery System for Multimedia Collaboration

Environment) application system on

DooRae(Distributed Object Oriented Multimedia

Application Crafting Environment for

Collaboration) framework, which has been to

support session control, floor control, media control,

window control and communication control. This

paper shows a design of the agents which can detect

an error and recover it automatically by using API

(Application Program Interface) functions in MS-

windows XP on the distributed system.

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