• Journal of Information Technology Applications and Management
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• v.17 no.2
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• pp.111-132
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• 2010

Korean telecommunications industry has a large scale market and boasts on high service quality and high technologies enough to provide the mobile video telephony service(the VTS) satisfactorily. For many years, Korean telecommunications companies have been investing enormous amount of money to advertise their VTS widely and to allow their customers to change their cell phones for the 3G(the third generation) devices indispensable for the VTS. However, despite their efforts, the VTS adoption rate in Korea is very low as of January, 2010 and it seems that customers seldom feel the necessity to use. From this viewpoint, it becomes necessary to identify antecedents influencing the intention to use for the VTS empirically. For this purpose, we have proposed several hypotheses from the perspective of the Value-based Adoption Model(VAM). We conducted a survey and found the several factors which influence the value perception of VTS.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.44-46
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• 2013

Since vessel traffic service system was introduced domestically in 1993, the incidence of vessel collision and grounding accidents has been diminished dramatically. However, recently the non-fishing boat incidents frequently occur outside boundary of vessel traffic control zone. Owing to this fact, before expanding and establishing 11 VTS centers all over the country by 2023, Korea Coast Guard has a plan to launch the nation's first researches on Mobile VTS Operation System utilizing Korea Coast Guard's patrol ships so as to devise practical countermeasures about those incidents.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.6
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• pp.466-475
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• 2014

The IVEF service is the draft standard designed for exchange of information on sea traffic between the vessel traffic systems and between the vessels. Standardization of this service is under way as a part of the next-generation navigation system, called e-Navigation. The International Association of Lighthouse Authorities (IALA) suggests, on its recommendation V-145, the IVEF service model and the protocol for provisioning of this service. But the detailed configuration of this service must be designed by the users. This study suggests, based on the basic service model and protocol provided in the recommendation V-145, the implementation of the J-VTS middleware which will facilitate exchange of information on sea traffic. The J-VTS middleware consists of various components for providing the IVEF service and for processing the IVEF message protocols. The vessel traffic systems and the vessels corresponding to upper-layer applications may use the IVEF service with the functions provided by the J-VTS middleware, and the services are designed to be accessed according to the security level of users.

• Annual Conference of KIPS
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• 2012.11a
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• pp.746-749
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• 2012

2012년을 마지막으로 국제 해사 기구인 IMO에서는 e-Navigation의 국제적인 프로젝트의 도입여부는 결정이 된다. 특히 e-Navigation의 여러 분야의 기술 중 하나인 IVEF의 표준화도 완료가 된다. 하지만 국내에서의 IVEF 관련 연구는 매우 드물기 때문에 발 빠른 서비스 도입과 취약점 연구에 대한 연구가 시급한 것이 현실이다. 게다가 IVEF 서비스는 shore-based e-Navigation 시스템 내에 포함되기 때문에 VTS간 안전한 해상 정보 교환을 위하여 기본적인 IVEF 기술 분석은 물론이며 내부적, 물리적인 안전한 서비스 제공방안에 대해서도 활발히 연구가 진행되어야 한다. 본 논문에서는 e-Navigation 선박항법 체계에서 데이터 통신 프로토콜로 표준화가 진행 중인 IVEF(Inter-system VTS Exchange Format)를 기반으로 하여 해상교통관제시스템(VTS)과 선박간의 데이터 송수신을 위한 프로토콜의 이용방안 및 그 구현에 관해 설명한다. 구현은 실제 운항중인 선박의 에뮬레이션을 위해 안드로이드 플랫폼이 탑재된 스마트 폰을 이용하였고, VTS 서비스 센터의 에뮬레이션을 위해 데스크톱을 이용하였다.

• The KIPS Transactions:PartD
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• v.8D no.2
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• pp.132-144
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• 2001

The broadcast environment is asymmetric communication aspect that is typically much greater communication capacity available from server to clients than in the opposite direction. In addition, most of mobile computing systems only allow the generation of read-only transactions from mobile clients for retrieving different types of information such as stock data, traffic information and news updates. Since previous concurrency control protocols, however, do not consider such a particular characteristics, the performance degradation occurs when those schemes are applied to the broadcast environment having quite a high data contention. In this paper, we propose OCC/2VTS (Optimistic Concurrency Control based on 2-Version and TimeStamp) that is most appropriate for broadcast environment. OCC/2VTS lets each client process and commit query transactions for itself by using two version data in cache. If the values of appropriate data items are not changed twice by invalidation report after a query transaction starts, the query transaction is committed safely independent of commitment of update transactions. OCC/2VTS decreases the number of informing server for the purpose of commitment. Due to broadcasting the validation reports including updated recent values, it reduces the opportunity of requesting a recent data values of server as well. As a result, OCC/2VTS makes full use of the asymmetric bandwidth. It also improves transaction throughput by increasing the query transaction commit ratio as much as possible.

• Journal of Navigation and Port Research
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• v.40 no.6
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• pp.369-374
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• 2016

Recently, due to the rapid development of smart computing technology, there have been a lot of studies on 3D navigation, and consequently the advanced commercial 3D navigation system and 3D VTS system are on the market. Even the 3D technology is well known and wide spreaded, unfortunately, the secret of code behind is still unleashed. The purpose of this paper is to show the basic methodologies to display ENC features under 3D display environment to meet the requirement of S-52 standards. The OpenGL ES is used to develop 3D ENC Viewer for further use on mobile platforms and web based vessel monitoring system. P articularly, area object triangulation, complex line drawing, polygon pattern filling and symbol drawing by texture mapping are explained in detail. The result of performance test is shown as table for correlation of SENC file size to display speed.

• Journal of Navigation and Port Research
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• v.27 no.6
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• pp.693-700
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• 2003

Universal AIS, which has been adopted officially for automatic identification systems among regulated ships by SOLAS, should be installed, for example, on all passenger ships over 300 tons engaged in international voyage and over 500 tons in domestic voyage, sequentially from 2002 to 2004. We must not overlook the fact than-ruled regions by regional authorities in the case of VTS. Actually a major portion of accidents have happened in small vessels like fishing vessels. However, they are not equipped with automatic identification tools, due to the high costs of the equipment for identifying purposes, as well as the absence of regulation In this paper, we researched the alternative of automatic identification for small vessel instead of universal AIS. We analyzed the requirement of automatic identification for small vessel about wireless communication method, traffic volume, etc. We proposed the identification system for small vessels in local areas and developed the Local Vessel Identification System (LVIS) interoperable with universal AIS using a PDA platform and wireless network.