Seojeong Lee

Database Design and Implementation for Vessel AIS Information Application

†,* Div. of IT, Korea Maritime University, Pusan 606-791, Korea요 약 :해상 교통량이 증가함에 따라 높아지는 선박 사고위험을 줄이기 위해 안전 운항을 위한 시스템은 필수적이다. 국제해사기구의 SOLAS에서는 선박에 AIS(Automatic Identification System)의 탑재를 의무화 하였다. AIS는 육상과 타 선박에 신원, 종류, 위치, 항해 상태를 포함한 각종 항해정보와 선박상태를 자동으로 알리는 시스템이다. 안전운항을 위한 응용서비스 개발의 대부분의 경우에 AIS는 활용될 수 있으므로, 체계적인 정보의 관리가 필요하다. 본 논문에서는 수신된 메시지 정보를 관리하기 위해 데이터베이스를 도입하였다. AIS메시지를 정적정보와 동적정보로 나누어 저장하고, 전자해도 기반 AIS 정보를 디스플레이하는 시스템 구현을 통해 설계의 결과를 확인했다. 핵심용어 : AIS, 항해정보, AIS용 데이터베이스, 전자해도, 선박정보 표시시스템Abstract :As the marine transportation has increased, the safe maneuvering system has been required. SOLAS obligated regulations for carrying AIS(Automatic Identification System) onboard. This system provides navigational information including identification, classification, position, a ships course and voyage status from own vessel to ground and other vessels. Being utilized in the most development of application service for safe maneuvering, they are to be managed systematic. In this paper, we introduce a database system to manage the voyage status and navigational information of AIS message. It is classified by static or dynamic. An electronic navigational chart display system is implemented to verify the design. Key words :AIS, navigational information, database design for AIS, electronic navigational chart, vessel information display system †교신저자 : 정회원, sjlee@hhu.ac.kr 051)410-4578* 정회원, topspace@naver.com 051)410-4570

Design of Database Schema by Conversion of UML-Based Register Schema

This paper concerns the conversion of the register schema of the International Hydrographic Organization (IHO)s S-100 standard to a database schema for implementation of a Feature Concept Dictionary (FCD) register. The FCD register, one of the registers of the IHO Geographic Information (GI) registry, maintains independent sets of feature, attribute, enumerated value, and information type definitions. Registered items in the FCD register are used to develop a feature catalogue, which is a component of an S-100-based product specification. For support of feature catalogue development, an FCD register can be implemented as a database system. In order to build the FCD registers database, we analyze its information model. But as the register schema is represented using the Unified Modeling Language (UML), we need to analyze the FCD register schema and design a database schema based on the conversion of the formers UML elements.

Harmonised Portrayal of e-Navigation-related Information

A Guideline on the Harmonised Portrayal of e-Navigation-related Information was recently completed by IALA. The purpose of this Guideline is to provide guidance regarding the presentation and display of e-Navigation-related information. The basic, over-riding premise of this Guideline is that shipborne and shore-based equipment, systems, and services should portray e-Navigation-related information to all users (both onboard and ashore) in a consistent manner. However, since e-Navigation is an evolutionary process, this goal-based guideline describes over-arching objectives to be achieved, while freedom to innovate is left to both developers and users. An explanation is provided about key aspects of the Guideline. In particular, a website has been established to show examples of useful ways to portray e-Navigation information for current as well as some future types of equipment, systems, and services.

A Development of AIS Vessel Monitoring System on online map using HTML5

최근 선박의 안전운항에 대한 요구가 증가되면서, 국제해사기구에서는 SOLAS규정에 따라 선박의 다양한 정보를 제공하는 AIS의 의무 장착을 시행하고 있다. AIS장비는 선박의 자선 정보를 주변 선박 및 육상에 자동으로 브로드캐스팅방식으로 발신하고, 또한 주변 선박의 정보를 수신할 수 있는 장비이다. 최근에는 다양한 디스플레이 장치에 서비스를 제공하기 위한 시도가 진행되고 있으며, 특히 웹 응용을 이용하는 사례가 많아지고 있다. 본 논문에서는 이러한 웹 기반 응용에 대한 실현을 실험해보기 위해, 온라인 기반의 상용지도를 이용해 AIS 정보를 확인할 수 있는 디스플레이 시스템을 구현해 보았다. AIS수신 메시지 분석을 통해 주변 선박 정보를 분류하고, 상용지도는 구글 맵을 사용했으며, 디스플레이 처리를 위해서는 차세대 웹 표준인 HTML5 기술을 이용하였다. 【As the increasing of requirement for safety navigation, IMO has enforced the mandatory installation of vessel AIS equipment by SOLAS regulation. The AIS transceiver broadcasts various vessel information which can be gathered by the receivers on-board or on-shore. And, recently, as web-based application developments on various devices have been increased, there are more and more requirements of AIS information presentation on internet. To meet these web-based application requirements, this paper shows the practical implementation of the AIS display system, which is on the Google maps as online commercial map and adopts the HTML5 as a web standard.】

A Hybrid Load Balancing Scheme for Games in Wireless Networks

A wireless network consists of a large number of nodes with limited resources. The large number of event data will be generated over a period of time in a wireless network. Also, faced with high resource demand variability and with misfit resource renting policies, the current practices is to overprovision for each game tens of owned data. In a wireless network, the agent node may become easily overloaded by the high demand from the players for updates. So, we propose a hybrid load balancing scheme for games in wireless networks which is based on allocating load on wireless mobile nodes proportionally to each of the agents capacities. This proposed scheme is a combined dynamic provisioning algorithm based on greedy graph and user-oriented load balancing scheme for maintaining the performance and stability of distributed system in wireless networks. We address the key functions for our proposed scheme and simulate the efficiency of our proposed scheme using mathematical analyses. We then testify that the proposal has best performance compared with previous researches.

A Research of Data Gathering Middleware and User Friendly Display for vessel PMS(Planned Maintenance System)

Vessel PMS (Planned Maintenance System) is a paper and/or software based system to monitor vessel engine equipment including main propulsion, steering, auxiliary machinery and cargo handling information. This is one of mandatory survey for vessel introduced by IMO (International Maritime Organization). The planned maintenance as well as documentation must be performed according to a system to be approved by classification agencies. Recently, vessel owners have preferred software based systems to collect and preserve accurate data. However, not ship specific and not taking into account the user are said by end users as operational difficulties. To relieve these concerns, this research analyzes vessel PMS data, suggests a middleware to support automatic collection and design consideration of user interface.

Design and Test of Communication Networks for Aids to Navigation based on AIS

As AIS AtoN has worked an essential role for aids to navigation, the World-wide IALA-Net has announced plans to build the system. Systematic beacon network may offer opportunities to make an infrastructure for information service and upgrade AtoN service performance. This paper proposes Aids to Navigation information service network for e-NAV. Network based on AIS is consist of AIS AtoN channels as Real, Synthetic or Virtual AIS AtoN. And inner network is consist of Wireless networks as AIS, WCDMA, WIFI, WIBRO, USN or VSAT. Introducing of various network systems can lead to combine and design aomong land, beacon and service network infrastructures.

The Extention and Implementation of User-defined AIS AtoN for Marine Safety Information Service

Recently, the marine traffics have been increased along with enlargement of overseas commerce. Increasing the marine traffic may make higher the risk of marine accidents. Especially, the rate of accidents on costal area are more frequently. As if the marine safety information can be afforded to vessel and shore, the accident rate would be down. AIS AtoN is the navigational safety support device which is subject to functional requirements of IALA and technical standards of ITU. In this paper, we extend and implement the user-defined specification of AIS AtoN with message 21 for AIS basic information, messsage 6 for status report and message 12/14 for safety management.

A coupling metric applying the characteristics of components

A high coupling between components makes it difficult to build the modulation of software and the reuse of components, and to manage the system due to the ripple effect by software change impact. Thus, a coupling metric is required to measure the coupling between components in order to design software effectively. In this paper, we propose an approach to improving the existing component-based coupling metrics by considering the dependency about the structured relationships and the method call types between classes. In addition, we prove the theoretical soundness of the proposed metric by the axioms of briand et al. and suggest the accuracy and practicality of the proposed metric through a comparison with the conventional metrics.

An Implementation of NAVTEX Application on Android Mobile Device

NAVTEX is one of useful tool for vessel safety navigation, which serves navigational warnings as well as urgent marine safety information to ships. However, it is not easy for novice to recognize where the warning happens. Recently, as the increase of smart mobile devices, there are many mobile device users in coastal area boarding on ship. In this paper, to help their safety navigation, we implement an application to display NAVTEX messages on Android mobile device. The title, summary and body of messages are displayed as text and the position of warning is shown on google map.