• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1998년도 추계학술대회 및 정기총회
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• pp.12-16
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• 1998

The purpose of this paper is to develop a knowledge-based real-time decision support system to support decision makers for efficient berth operation of Inchon Port. In these days, the efficient berth operation has been many studied. The berth operation rules differ from port to port and the problem is highly dependent on natural, geographical and operational environment of port. In Inchon Port, the ship's entrance into port and departure from port is extremely affected by the status of dock and berth because of capacity restriction. First, we analyzed the specific characteristics of Inchon Port such as dock based on the data of 1997. And then, we construct the database of experts knowledge for berth utilization. Finally, we build the real-time decision support system for the efficient berth operation of Inchon Port to make the better berth allocation in case of not only regular scheduling but also dynamic scheduling such as delay in berth operation and exchange of ship between berths. The DSS is developed with graphic user interface(GUI) concept to help the user determining user interactive updating of the port status. Then this DSS will be provide decision maker with an efficient and fast way to berth allocation, and reduce wastes of time, space, and manpower in Inchon Port operation.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2011년도 춘계학술대회
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• pp.16-19
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• 2011

1990년대 후반 IMO 해양사고 조사실시 결과(A.21/884-9)에 따르면 해양사고 원인요소에 Human Elements가 크게 관련된다. 이런 관점에서 STCW Code A.에 의한 해기사의 요건에 따른 교육과정의 재점검과 함께 교과과정의 운영시스템에 대한 분석이 필요하다. 이를 위하여 USMMA, PMMA를 중심으로 한 해기 교육기관의 교육내용을 우리나라 해기사 교육기관과 비교 분석한다. 본 연구의 결과로 해양사고 감소 및 예방을 위한 개선된 해기사 교육 시스템을 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.361-362
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• 2007

This paper presents the Traffic information system that based on an embedded WinCE board which has GPS and HSDPA. This system is able to overcome the limit of area using the Internet service which other systems can't provide. When the embedded board receives data about the geometric and vehicle speed information, it transmits to the server via HSDPA/the Internet. The server receives and processes it for the path services. And also we present the path guidance algorithm which is based on the speed information. These algorithm responses to the dynamical traffic condition through updating traffic information. Especially, we suggest a Traffic Status Variable in each branch which represents each road's traffic status. This Traffic Status Variable contains speed, road grade; we separate the road three groups as speed limitation; and past speed data - for example, week day rush hour of each road. In addition, the data of cross about left-turn or right-turn can update. Those elements is consisted Traffic Status Variable.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.652-655
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• 2017

해양 정보통신 기술 발달로 해상에서도 다양한 통신 서비스 요구가 증대됨에 따라 해상 멀티대역 네트워크개념이 도입되고, 이를 위해 이기종 망 간에 최적의 네트워크를 선택하여 통신대역을 전환하는 멀티대역 네트워크 선택기(MNSS) 시스템이 소개되었다. 본 논문에서는 해상멀티대역 네트워크를 위해 개발된 MNSS 시스템의 MNSS 서버, 네트워크 인터페이스, 사용자 응용프로그램을 구현하고, 실내 실험환경 구축을 통해 각 통신대역의 가용상태 갱신, 통신대역 전환, 최적통신대역에서의 데이터통신 기능들을 검증한다.

• 한국비블리아학회지
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• 제30권4호
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• pp.5-27
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• 2019

본 연구는 국내 박물관 웹 사이트의 메뉴구조 및 콘텐츠 분석을 통하여 박물관 웹 사이트 메뉴구조의 발전방향을 제시한 것이다. 이를 위하여 국내 27개의 국립·공립·대학 박물관을 대상으로 메뉴구조를 콘텐츠 영역으로 구분, 정리하고 인포메이션 아키텍처의 구성요소인 조직화 시스템, 레이블링 시스템, 내비게이션 시스템의 측면에서 분석하였다. 본 연구의 결과, 적절한 폭과 깊이의 계층구조, 명확하고 일관성 있는 레이블 사용, 소장품 검색 기능 제공 및 소장품 현황 업데이트, 웹 사이트 오류에 대한 즉각 수정, 웹 사이트의 지속적 관리 등을 발전 방안으로 제시하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.419-421
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• 2010

시공간 데이터의 필드 업데이트를 지원하는 모바일 클라이언트-서버 동기화 시스템은 동기화 작업 중 서버 및 클라이언트 시스템의 고장 및 네트워크의 고장으로 동기화 작업이 완료되지 못하고 중단될 수 있다. 이러한 동기화 작업의 중단은 서버 및 클라이언트 데이터베이스의 일관성 오류 및 동기화 작업의 재수행시 정상적인 동기화 작업이 진행되지 못하는 문제가 발생할 수 있다. 이 논문에서는 동기화 작업 중 발생한 고장의 종류를 분석하고, 데이터베이스의 일관성 유지 및 동기화 작업의 재수행이 가능한 회복 기법을 제안한다.

• 한국측량학회지
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• 제37권5호
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• pp.331-341
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• 2019

With the popularity of sensor-rich environments, smartphones have become one of the major platforms for obtaining and sharing information. Since it is difficult to utilize GNSS (Global Navigation Satellite System) inside the area with many buildings, the localization of smartphone in this case is considered as a challenging task. To resolve problem of localization using smartphone a four step image-based localization method and procedure is proposed. To improve the localization accuracy of smartphone datasets, MMS (Mobile Mapping System) and Google Street View were utilized. In our approach first, the searching for candidate matching image is performed by the query image of smartphone's using GNSS observation. Second, the SURF (Speed-Up Robust Features) image matching between the smartphone image and reference dataset is done and the wrong matching points are eliminated. Third, the geometric transformation is performed using the matching points with 2D affine transformation. Finally, the smartphone location and attitude estimation are done by PnP (Perspective-n-Point) algorithm. The location of smartphone GNSS observation is improved from the original 10.204m to a mean error of 3.575m. The attitude estimation is lower than 25 degrees from the 92.4% of the adjsuted images with an average of 5.1973 degrees.

• Smart Structures and Systems
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• 제23권3호
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• pp.295-306
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• 2019

Shanghai Tower is a 632-meter super high-rise building located in an area with wind and active earthquake. A sophisticated structural health monitoring (SHM) system consisting of more than 400 sensors has been built to carry out a long-term monitoring for its operational safety. In this paper, a reduced-order model including 31 elements was generated from a full model of this super tall building. An iterative regularized matrix method was proposed to tune the system parameters, making the dynamic characteristic of the reduced-order model be consistent with those in the full model. The updating reduced-order model can be regarded as a benchmark model for further analysis. A long-term monitoring for structural dynamic characteristics of Shanghai Tower under different construction stages was also investigated. The identified results, including natural frequency and damping ratio, were discussed. Based on the data collected from the SHM system, the dynamic characteristics of the whole structure was investigated. Compared with the result of the finite element model, a good agreement can be observed. The result provides a valuable reference for examining the evolution of future dynamic characteristics of this super tall building.

• 자동차안전학회지
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• 제13권3호
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• pp.86-94
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• 2021

Since automated driving system (ADS) has great potential to innovate various fields of automobile and mobility industries, major countries are establishing safety standards for autonomous vehicles to support technology development. However, in order to prevent technology development from being hampered by the safety standards for technologies still under development, safety guidelines are applied until the technologies are mature. For example, the safety 'guideline' for level 4 ADS was published in December 2020 by the Ministry of Land, Infrastructure and Transport of Korea, while the safety 'standards' for level 3 ADS was promulgated in December 2019. In this study, the domestic safety guideline for level 4 ADS is analyzed with the guidelines of major advanced countries in terms of safety elements. As it takes a lot of time before the safety standards of level 4 ADS is introduced, it is expected that the safety guideline will be updated several times. As necessary considerations when updating the safety guideline, industry acceptance, harmonization between safety elements, validation methods of system performance, and the user options are discussed.

• International Journal of Computer Science & Network Security
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• 제23권2호
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• pp.55-64
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• 2023

The travelling salesman problem (TSP) is an important combinatorial optimization problem that is used in several engineering science branches and has drawn interest to several researchers and scientists. In this problem, a salesman from an arbitrary node, called the warehouse, starts moving and returns to the warehouse after visiting n clients, given that each client is visited only once. The objective in this problem is to find the route with the least cost to the salesman. In this study, a meta-based ant colony system algorithm (ACSA) is suggested to find solution to the TSP that does not use local pheromone update. This algorithm uses the global pheromone update and new heuristic information. Further, pheromone evaporation coefficients are used in search space of the problem as diversification. This modification allows the algorithm to escape local optimization points as much as possible. In addition, 3-opt local search is used as an intensification mechanism for more quality. The effectiveness of the suggested algorithm is assessed on a several standard problem instances. The results show the power of the suggested algorithm which could find quality solutions with a small gap, between obtained solution and optimal solution, of 1%. Additionally, the results in contrast with other algorithms show the appropriate quality of competitiveness of our proposed ACSA.