• Journal of the Korean Society of Marine Environment & Safety
• /
• v.24 no.5
• /
• pp.604-610
• /
• 2018

Recently, due to the rapid growth of the leisure industry, demand for small-scale flotation and mooring pontoon platforms has been increasing rapidly. Standard rules for the design and structural safety of such structures have become necessary. This paper provides criteria that can be referenced when designing pontoon platforms, and also introduces structural safety evaluation procedures. In this study, the structural safety and stability of a 15-meter pontoon platform were investigated through structural design and finite element analysis. For platforms of less than 10 meters in length, a simple structural calculation can be used, but for platforms over 10 meters, a detailed structural strength review must be considered to meet safety guidelines defined in existing regulations. The structural strength of the initial design was examined and its structural safety was verified. For future research, it is an evaluative system was developed that can be used to examine the various loading conditions during design.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.10a
• /
• pp.577-579
• /
• 2022

It is not easy to achieve the essential goal of knowledge management, which is to strengthen individual competence and organizational competitiveness, only by collecting distributed knowledge in the centralized knowledge repository conducted so far. In order to establish a sustainable knowledge ecosystem, we must expand knowledge production through exchange and cooperation, not independent knowledge production. Through this, producing meaningful and high-value knowledge resources becomes possible. Therefore, this study aims to design an integrated service platform that stores science and technology knowledge resources and reproduces and evolves knowledge through opening, sharing, and utilization. In order to evaluate its excellence, Five experts evaluated the designed platform on detailed items classified into planning adequacy, platform effectiveness, platform efficiency, and roadmap adequacy. The evaluation score averaged 95.56 points for the above four evaluation items.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.11
• /
• pp.884-891
• /
• 2020

The collapse of bridges can cause massive casualties and economic losses. Therefore, it is thus essential to evaluate the structural safety of bridges. For this task, structural reliability analysis, considering various bridge-related uncertainty factors, is often used. This paper proposes a new computational platform to perform structural reliability analysis for bridges and evaluate their structural safety under various loading conditions. For this purpose, a software package of reliability analysis, Finite Element Reliability Using MATLAB (FERUM), was integrated with MIDAS/CIVIL, which is a widely-used commercial software package specialized for bridges. Furthermore, a graphical user interface (GUI) control module has been added to FERUM to overcome the limitations of software operation. In this study, the proposed platform was applied to a simple frame structure, and the analysis results of the FORM (First-Order Reliability Method) and MCS (Monte Carlo simulation), which are representative reliability analysis methods, were compared. The proposed platform was verified by confirming that the calculated failure probability difference was less than 5%. In addition, the structural safety of a pre-stressed concrete (PSC) bridge was evaluated considering the KL-510 vehicle model. The proposed new structural reliability analysis platform is expected to enable an effective reliability-based safety evaluation of bridges.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.26 no.4
• /
• pp.374-381
• /
• 2020

According to international regulations, it is mandatory for navigators or engineers to acquire suitable skillsets before their designation as a duty officer on board. One of the most important elements is Maritime English (ME), wherein students are taught a required set of basic skills that enable them to process various documents related to accidents, ship conditions, and inspections. Students have to be equipped not only with the use of general English skills but also with the coherent use of technical terms and phrases. However, due to the unique circumstances that exist in the maritime domain, the methods used for imparting maritime knowledge and the manner in which it is evaluated are restricted. Hence, this study aims to utilize an online Maritime English learning and testing platform that can be accessed on smart devices to analyze its impact on the students' learning process. An experiment was conducted on two groups of cadets, one that used the platform and another group that did not. After six-week, the experiment results showed a significant difference between the ME test scores of the two groups. The test scores were further analyzed by incorporating the students' personal elements to measure the ef icacy of the ME test platform. Therefore, the learning and evaluation processes are expected to be implemented in ways that are appropriate and convenient to specific circumstances and be widely used in the field of maritime education in the future.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.3B
• /
• pp.105-113
• /
• 2005

In this paper, through the implementation of the application service, we evaluated the feasibility and availability of the staged application service platform, which is based on the sharing of the PVM cluster. Application service platform provides three managers for dividing the request processing steps into two stages, such as a request processing stage and a service providing stage. Three managers and its relation to the divided stages are as follows, service manager and load manager to distribute the request in front-end server for a request processing stage, job manager in clustered(back-end) servers for a service providing stage. The experiment shows that the staged application service platform provides more stable and scalable characteristics and better performance improvement on the dynamic load changes than the single server system. And also it shows that real application service system can be implemented easily without modification of the proposed service platform.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.5B
• /
• pp.449-454
• /
• 2009

In this paper, we analyze the hardware and software platform for constructing the USN in the vessel environment. Specifically, we analyze the mote technology based on the CC2420 in the hardware platform and analyze the TinyOS platform in the software platform. We also analyze the physical layer of IEEE802.15.4 which is the standard of the USN communication. In the simulation, we evaluate the performance in the physical layer of ZigBee/IEEE 802.15.4 by using the MATLAB and verify the validity of constructing the USN in the vessel environment based on the simulation results.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.395-395
• /
• 2023

전 세계 곳곳에서 매년 발생하고 있는 홍수, 가뭄, 수질 문제는 인류가 해결해야 할 공통적인 문제이다. 홍수, 가뭄, 수질 문제뿐만 아니라 수자원의 지역적인 불균형과 인근 지역의 물 분배 문제, 공유하천 문제 등으로 인한 물 사용자 간의 물 갈등, 물 분쟁도 지속되고 있다. 최근 정보통신기술이 발달함에 따라 수자원 관련 각종 위험지표, 물 갈등, 물 분쟁 사례를 자료화하여 활용할 수 있는 온라인 플랫폼이 개발되고 있다. Aqueduct 3.0은 전 세계 물 위험을 식별하고 평가할 수 있는 물 위험평가 프로그램(water risk assessment tool)으로 세계 수자원 협회에서 2019년 기존 프로그램을 업데이트하여, 온라인 플랫폼을 통해 전 세계 각국의 지역별 수자원 분포에 따른 각종 위험지도와 데이터를 무료로 제공하고 있다. 또한 세계 자연기금(World Wide Fund For Nature)도 온라인 플랫폼으로 전 세계의 물 위험 필터도구(water risk filter tool)를 제공하고 있다. 또한 물 갈등 연대기(Water Conflict Chronology)는 태평양 협회에서 전 세계 물갈등 사례를 수집하여 연대별로 정리한 것으로, 업데이트되어 2022년 사례까지 제공하고 있다. 본 연구는 Aqueduct와 Water Conflict Chronology 등 온라인 플랫폼에 탑재된 한반도 관련 수자원 자료를 조사하여 기존 자료와 분석하였다. 연구 결과 Aqueduct와 Water Conflict Chronology 등 온라인 플랫폼이 수자원 관련 교육의 유용한 도구임을 알 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2022.11a
• /
• pp.937-939
• /
• 2022

최근 에듀테크 산업은 코로나 19와 4차 산업사회의 발달로 교육의 디지털 트랜스포메이션이 진행되고 있다. 그러나 기존 에듀테크 기술들은 코로나 19로 인해 예기치 못한 환경에서의 교육 불균형과 영유아들의 언어적, 신체적 발달에 대한 방향을 제시하고 있지 못하다. 이에 본 논문에서는 MQTT 기반 유아 신체활동 에듀테크 플랫폼을 제안한다. 제안하는 플랫폼의 적용된 기술은 MQTT와 아두이노 센서를 활용하여 학습 동기를 유발하고 자발적인 참여를 유도한다. 성능평가는 제안하는 플랫폼의 주요 기능인 센서 데이터 처리 정확도를 분석하기 위해 QoS(Quality of Service)레벨별 데이터 처리율과 초당 처리량을 분석한다. 부하 테스트 성능평가를 통해 QoS2 레벨이 요청된 데이터 처리를 모두 정상적으로 완료하여 제안하는 플랫폼의 데이터의 신뢰성을 보장하기 위해 QoS 레벨 2를 적용하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.11a
• /
• pp.286-288
• /
• 2018

본 발표는 대한민국 해기사 커뮤니케이션 역량 강화를 위해, 해사 영어 구술시험 개발의 필요성을 타국의 사례 등을 통해 제안하고, 이를 위해 시범 개발 중인 "한국형 해사 영어 구술시험"의 개발 제작 과정과 현재 개발 진행 사항을 공유하고, 향후 추진 방향을 모색하기 위함이다. 따라서 본 발표에서는, 구술시험 평가 수립을 위한 유관 산업 문헌 조사(국제 교통 관련 산업 의사소통 지침, 평가 척도), 해기사 직무에 따른 영어 구술시험 문제 개발 계획 수립 및 시험 설계 시 검토 사항, 모의 구술시험 설계 및 시행, 모의시험 효과 측정, 측정 결과에 따른 향후 평가 척도 개발 시 고려 사항, 구술 평가를 인공지능 평가 방법 도입 방안 모색 등의 과정을 순차적으로 소개하고, 이에 대한 결과물을 공유하며, 향후 발전 방향을 제안하고자 한다.

• Journal of Korea Game Society
• /
• v.18 no.1
• /
• pp.7-18
• /
• 2018

As coding education is ubiquitous in elementary or higher school curriculum, puzzle-based coding platforms such as Scratch or Entry have been popularly deployed and employed by many Korean coding educational institutions. In this article, we propose a quantitative students' coding assessment methodology and discuss several issues of the method. Besides, we show its usefulness through case studies shown in our proprietary coding platform called "CodingPuzzle" system. Additionally, we describe detailed design and implementation issues of our coding assessment system that has already been ported to the CodingPuzzle system and is currently under operation.