• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1994.06a
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• pp.191-195
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• 1994

• TTA Journal
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• s.137
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• pp.62-67
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• 2011

• Electronics and Telecommunications Trends
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• v.7 no.3
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• pp.12-23
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• 1992

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.898-901
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• 1996

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.10a
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• pp.285-288
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• 1996

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.10a
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• pp.373-376
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• 1998

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.8A
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• pp.1085-1095
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• 2000

In this paper, we have defined the rules and the algorithm for diagnosis and recovery of routing configuration fault on a system. By using them, we have implemented the Java-based system that can manage routing configuration fault automatically. To manage routing configuration fault, the production rule for network configuration management, the production rule for routing configuration fault diagnosis, and the production rule for routing configuration fault recovery have been proposed. Rule-based routing configuration fault management system has been implemented on the basis of backward chaining algorithm and applied for meta rules for the purpose of interconnecting the production rules. We have derived the experimental result from transition process of the rules, the Blackboard, the goals based on scenarios. Through the implementation of dynamically applicable system in heterogeneous and rapidly changing network environments, we have proposed the methodology for network configuration fault management. Also, we expect that network configuration manager can reduce time and cost wasted for routing configuration fault management.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.8A
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• pp.569-580
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• 2003

One of the important advantages of multichannel switches is the incorporation of inherent fault tolerance into the switching fabric. For example, if a link which belongs to the multichannel group fails, the remaining links can assume responsibility for some of the traffic on the failed link. On the other hand, if faults occur in the switching elements, it can lead to erroneous routing and sequencing in the multichannel switch. We investigate several fault localization algorithms in multichannel crossbar ATM switches with a view to early fault recovery, The optimal algorithm gives the best performance in terms of time to localization but is computationally complex which makes it difficult to implement. We develop an on-line algorithm which is computationally mote efficient than the optimal algorithm. We evaluate its performance through simulation. The simulation results show that performance of the on line algorithm is only slightly sub-optimal for both random and bursty traffic. Finally a fault recovery algorithm is described which utilizes the information provided by the fault localization algorithm.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.5
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• pp.1125-1134
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• 2018

The purpose of this study was comparing the disability awareness of occupational therapists and none therapists, and investigating the disability awareness according to the demographic characteristics of the respondents. The questionnaire was distributed through the online with a questionnaire based on social network service, and analyzed 62 responses of none therapists and 60 responses of occupational therapists. In results, disability awareness was not significantly different between occupational therapists and none therapists(p>.05). But, in subscale of disability awareness item 4 and 7, occupational therapists were significantly higher than none therapists(p<.05). In all respondents, disability awareness was more positive in males than females(p<.05). Also, there was no difference in disability awareness according to presence of disabled persons among family members or relatives(p>.05). However, All respondents who answered 'Yes' in the presence of disabled persons among family members or relatives in responders were significantly higher than those who answered 'No' in item 4(p<.05). There was no correlation between age and disability awareness(p>.05). The authors discussed suggestions in results of this study.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.5
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• pp.942-947
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• 2008

A cluster server usually consists of a front end node and multiple backend nodes. Though increasing the number of bookend nodes can result in the more QoS(Quality of Service) streams for clients, the possibility of failures in backend nodes is proportionally increased. The failure causes not only the stop of all streaming service but also the loss of the current playing positions. In this paper, when a backend node becomes a failed state, the recovery mechanisms are studied to support the unceasing streaming service. The basic techniques are hewn as providing very high speed data transfer rates suitable for the video streaming. However, without considering the architecture of cluster-based VOD server, the application of these basic techniques causes the performance bottleneck of the internal network for recovery and also results in the inefficiency CPU usage of backend nodes. To resolve these problems, we propose a new failure recovery mechanism based on the pipeline computing concept.