• Ocean and Polar Research
• /
• v.30 no.2
• /
• pp.207-213
• /
• 2008

An interest in deep-sea measurements has been gradually increased in association with global warming and the need for deep-sea resources development. Long-term mooring of current meters has been recently conducted primarily for these purposes. In general, current meters equipped on a mooring line are deployed and recovered for a planned period in the sea. This paper describes all the preparations for deep-sea mooring. It also reviews the possible causes of the failures of recovery, which occasionally happens in the sea.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2020.07a
• /
• pp.363-364
• /
• 2020

본 논문에서는 쿠버네티스와 블록체인 서비스 레지스트리를 이용한 블록체인 서비스 중복실행 기법을 제안한다. 이 기법은 컨테이너 관리 도구인 쿠버네티스를 이용하여 중복 실행 기법이 적용된 블록체인 서비스를 신속하게 실행할 수 있다. 또한 이 기법은 서비스 접근 위치, 복구를 위한 정보 등을 저장하는 블록체인 서비스 레지스트리를 이용하여 서비스 장애가 발생할 경우에 블록체인 서비스를 견고하게 실행할 수 있다.

• Proceedings of the KSR Conference
• /
• 2008.06a
• /
• pp.118-121
• /
• 2008

Bimodal tram is a transit with no-step floor for wheel-chaired persons, with docking to the station precisely and moving on schedule like train. Because of the automatic traveling of bimodal tram to search and follow the magnet embedded in roadway, bimodal tram should be careful about rainfall, snow and wind like a car driving on roadway in respect to natural disasters. Though response procedures in emergency are different according to the passengers' boarding, emergency mobilization is needed if any emergency situation happens. Emergency mobilization is the act of preparing for major catastrophic events, which may affect public transportation systems or their service areas, by assembling and organizing resources, including people, equipment, facilities, communications systems, expert technical support, and public information systems and protocols. Mobilization is the process that ensures that the right people will deploy appropriate resources at the correct time. Effective mobilization requires a partnership of local and state agencies. Public transportation operators and systems play vital roles in response to and recovery from emergencies and other unexpected catastrophic events. These systems, and their capabilities to mobilize resources, are profoundly affected by the decisions and directives of others during these activities. In this study, we focused on the emergency management for bimodal tram and reviewed the considerations about infrastructures under natural disasters, especially heavy rainfall.

• Journal of Internet Computing and Services
• /
• v.4 no.3
• /
• pp.47-55
• /
• 2003

Multicast protocols ore developed in order to support group communications efficiently, However. there still exist some issues to be solved for deploy multicast protocol in the public internet. This paper refers problem of existing Reliable Multicast Protocols and redesigns component function, and proposes enhanced reliable multicast transport protocol, This paper proposed a improved multicast transport scheme in NACK based reliable multicast. This scheme is much faster than by sender-initiated or receiver-initiated recovery and latency is smaller. Designed components are implemented in UNIX environment using C programming longuage. Then the protocol was evaluated performance through simulation. As the result, proposed protocol is better than existing protocols in both of transmission delay and packet loss. Especially, proposed protocol in this paper con be used in multicast services needed high reliability.