• 한국항해학회지
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• 제23권3호
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• pp.1-15
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• 1999

Recently, due to the several factors such as the advent of very large vessels and high-speed vessels, and the increase of the maritime traffic density at sea, the obligation, responsibility and burden of marine officers on duty for the safety of navigation has been highly escalated. Under these situations, if the appropriate and correct navigational information is given to officers at real time by means of certain integrated information processing system, these obligation, burden and danger can be reduced. This paper deals with the study on the development of the Navigational Information Monitoring and Recording System that can give and record the integrated navigational information based on the personal computer system installed on board. To construct this system, the interface unit which changes different signal types of navigational equipments to NMEA 0183 signal format and the application software to show the visual navigational information were developed. In this study, the navigation system of T/S HANBADA in Korea Maritime University was used in order to construct the actual system that can be utilized in other ships, and also the performance test was carried out several times to examine the performance of the system developed. It was proved that all functions of the system as designed worked smoothly through the performance test. Also this system could be operated easily and conveniently by every user.

• JSTS:Journal of Semiconductor Technology and Science
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• 제3권4호
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• pp.167-174
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• 2003

This paper proposes a network processor especially optimized for content switching. With 2Gbps port capability, it integrates packet processor cluster, content-based classification engine and traffic manager on a single chip. A switch fabric architecture is also designed for scale-up of the network processor's capability over hundreds gigabit bandwidth. Applied in real network systems, the network processor shows wire-speed network address translator (NAT) and content-based switching performance.

• 한국시뮬레이션학회논문지
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• 제17권3호
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• pp.85-94
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• 2008

본 연구는 컨테이너 터미널에서 사용될 수 있는 교착방지를 위한 알고리즘 개발을 목표로 하였다. 기존의 교착방지 알고리즘은 많은 계산시간을 소요한다는 단점을 극복하기 위하여 본 연구에서는 하나의 경로에 대해서 예약스케줄을 작성하여 두고 반복적으로 사용하는 예약 스케줄 표 방식을 제안하였다. 시뮬레이션 실험 결과 예약 스케줄 표 방식은 그때그때의 주행경로에 대한 예약스케줄링을 위하여 계산시간이 필요 없기 때문에 AGV의 실시간 운영을 위하여 유용한 방식임을 알 수 있었다.

• 수산해양기술연구
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• 제50권1호
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• pp.21-29
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• 2014

The dynamic information of radar and automatic identification system (AIS) for targets obtained from the traffic vessels operating in the north outer harbor and surrounding waters of Busan port, Korea. The target information was analyzed to investigate the potential collision risk resulting from the invalid true heading (HDT) information of AIS and the integration ambiguity in the graphic presentation of both tracked data sets for two systems. An integrated display system (IDS) for supporting the navigator of offshore fishing vessels was also developed to find possible maneuvering solutions for collision avoidance by comparing radar data with AIS data in real-time at sea. Consequently, the multiple functions of IDS can provide additional information that is potentially valuable for taking action to avoid the collision in offshore fishing vessels. However, the integration criteria of radar and AIS targets in the IDS must be carefully established to eliminate the fusion ambiguity in the graphic presentation of both AIS and radar symbols such as the one or two physical targets which are very close to each other.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 추계 종합학술대회 논문집
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• pp.88-93
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• 2005

최근 들어 모바일 인터넷, RFID 등의 확산으로 인하여 유비쿼터스(Ubiquitous)에 대한 관심이 증가하고 있다. 부산 역시 최첨단의 유비쿼터스 정보기술을 항만물류, 교통, 관광컨벤션, 의료 등 전략산업에 적용시켜 추진함으로써 분야간 시너지효과를 창출하여 첨단 유비쿼터스 도시(U-city)로 변모시키고자 계획하고 있다. U-관광컨벤션 서비스는 기존의 관광정보시스템과는 다른 방식으로 소비자가 이를 어떻게 수용하는 가의 여부가 향후 U-관광컨벤션의 성장잠재력을 결정한다는 점에서 어떠한 요인들이 U-관광컨벤션 수용의도에 영향을 미치는가 하는 연구가 필요한 시점이라고 생각된다. 이에 본 연구에서는 TAM을 적용하여 관광콘텐츠가 U-관광컨벤션 수용의도에 미치는 영향을 검증하고자 한다.

• 선박안전
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• 통권32호
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• pp.57-71
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• 2012

Recently, the navigation risk is increasing significantly with growing of vessels' volume and propelling marine facilities, water bridges and port development etc. At this point of time, the Ministry of Land, Transport, and Maritime Affairs introduced the Maritime Safety Audit(MSA) in amendment of the Korea Marine Traffic Law. audit results were survey for the last two years. As a result, appropriate certificate appears 11% among audit report, is an urgent need for improved quality of audit reports. This study is aimed to propose about Audit Personnel Education & Training System. To these solve, this paper analyzed the tendency of Audit Personnel Training. And also the opinions of user and experts were investigated and analyzed using Questionnaire survey methods. As a result, this paper was suggested, the construction of Audit Personnel Training System and the curriculum and training contents for 5-days of basic course, 2-days of expert course, 3-days of Qualification Maintain course.

• Journal of Electrical Engineering and information Science
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• 제2권6호
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• pp.48-55
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• 1997

Advances in VLSI technology have brought us completely new design principles for the high-performance switching fabrics including ATM switches. From a practical point of view, port scalability of ATM switches emerges as an important issue while complexity and performance of the switches have been major issues in the switch design. In this paper, we propose a cost-effective approach to modular ATM switch design which provides the good scalability. Taking advantages of both time-division and space-division switch architectures, we propose a practically implementable large scale ATM switch architecture. We present a scalable shared buffer type switch for a building block and its expansion method. In our design, a large scale ATM switch is realized by interconnecting the proposed shared buffer switches in three stages. We also present an efficient control mechanism of the shared buffers, synchronization method for the switches in each stage, and a flow control between stages. It is believed that the proposed approach will have a significant impact on both improving the ATM switch performance and enhancing the scalability of the switch with a new cost-effective scheme for handling the traffic congestion. We show that the proposed ATM switch provides an excellent performance and that its cell delay characteristic is comparable to output queueing which provides the best performance in cell delay among known approaches.

• 한국컴퓨터정보학회논문지
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• 제8권3호
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• pp.100-106
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• 2003

ATM망은 개방형 통신망에서 다양한 서비스 와 QOS를 지원하며 대역폭 확장을 통한 망 자원의 효율성과 융통성을 제공한다. 그러나 이런 트래픽 들에 대한 품질 서비스에 대한 연구가 많이 진행되고 있으나 트래픽 보안을 안전성 검사는 연구대상 부분이 많이 존재한다. 본 논문에서는 ATM FORUM 보안그룹에서 정한 ATM Security Specification 1.1 중심으로 보안서비스 개념을 소개하고 외부망에서 내부망으로 들어오는 패킷들을 보안을 위한 안정성기준으로 효율적으로 처리하는 스위치와 결합한 방화벽처리 루틴 및 CAC 루틴을 소개한다. 패킷들의 안전성 등급을 분류처리 하기 위하여 SSC(Special Service Cell)를 도입한다. 본 논문에서는 스위치 처리량, 셀 지연등을 위한 시뮬레이션 시나리오을 제안한다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2003년도 추계학술대회 및 정기총회
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• pp.35-40
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• 2003

This paper presents a method for designing layout on the yard and evaluating alternative designs of the layout by applying simulation. The method is based on the concepts of the conventional port container terminal with a perpendicular yard layout. In general, yard design of the container terminal is consists of the two major parts. One is to divide yard area between the number of sections and the number of runs and the other is to decide the number of equipment that is the yard truck and yard crane. In the past days, this design was depended on the experience of the terminal operator and the structure of the conventional terminal layout because it is a very complex decision problem. In this paper we suggest the method of yard design as a conceptual procedure and estimate the efficiency of the container crane and the optimal the number of equipment using the simulation. Numerical examples are provided in order to illustrate the conceptual procedure. As the example, the suggested method and simulation are applied to the virtual container terminal with a perpendicular yard layout. In the results, the number of sections and runs on yard area, the number of yard truck per container crane and the number of yard crane per run are decided. In additional, the traffic among blocks on yard layout is estimated in terms of rate.

• 한국컴퓨터정보학회논문지
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• 제24권4호
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• pp.123-128
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• 2019

In modern society, there are WEB sites that provides information in various fields by many advances in IT technology. As the number of users accessing the Web increases, one server becomes unavailable, and multiple servers are deployed to provide the service. In addition, systems that control servers are required to manage multiple servers. However, server control systems in the existing market are mostly those that notify managers through SMS and apps when a server's down or a controlled port is closed. However, in case of servers that generate a lot of traffic, the Web server and the WAS are operated and managed each independently. The WEB and WAS provide service by connecting to each other. However, the connection between WEB and WAS may be disconnected due to various environmental factors. In this case, the existing control system can not determine whether the service is working properly. Even in the case of WEB and WAS of a server that is operated independently, there is a phenomenon that the existing control system does not know the problem even when the normal service is not provided due to environmental factors such as disconnection to DB. In this paper, we implemented a system to check the normal state of Web service using Web crawling to solve this problem.