• Title, Summary, Keyword: 해양경찰

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A Study on the Link Composition Design of a Double Link Type Level Luffing Jib Crane (I) (이중 링크 형식 수평 인입 집 크레인의 링크 구성 설계에 관한 연구( I ))

  • Moon, D.H.;Hur, C.W.;Choi, M.S.
    • Journal of Power System Engineering
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    • v.13 no.1
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    • pp.19-25
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    • 2009
  • This paper is a study on the link composition design of a double link type level luffing jib crane using path generation synthesis passing through three precision points according to parameters, the length of backstay, the ratio of fly jib length between two moving hinges to the total length of fly jib, the location of a intermediate passing point etc. when the maximum and minimum working radius of the crane are given. The performance of the crane depends on the deviation of the luffing trajectory at fly jib tip. The luffing trajectories according to the above parameters are analyzed and shown in graphs by the developed computer program. In a real-life design, some trials are needed to arrive at a proper link composition design. Therefore, it is expected that the present computer program can rapidly and exactly deal with a link composition design proper to the design criteria of the crane.

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Dynamic Distributed Hierarchical Routing Plan Method for UTIS and DSRC systems (UTIS, DSRC 통합 동적 분산 계층 경로탐색 기법)

  • Baek, Yeong-Tae;Lee, Se-Hoon;Kim, Sang-Oh
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.47-50
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    • 2010
  • 본 논문은 현재 경찰청 및 각 지자체의 주도하에 수도권을 중심으로 새롭게 보급되고 있는 도시 교통 정보 시스템 (UTIS)과 국토해양부 및 한국 도로 공사 등을 중심으로 한 DSRC 기반의 교통 정보 시스템을 모두 활용하는 시스템 및 효율적인 경로탐색 알고리즘을 제안한다. 도시 교통 정보 시스템은 무선랜과 같은 프로토콜을 이용해서, 기존 단방향 방식인 TPEG의 주요 도로 위주의 제한된 교통 정보 단점을 극복하고 많은 지선를 포함한 교통 정보를 제공하고 있다. 그러나 대부분의 운전자들이 단지 도심 내에서만 운전하는 것이 아니고 고속도로 등을 통해서 장거리 운전도 하기 때문에 고속도로 상의 DSRC 기반의 서비스도 동일 단말에서 지원해야 하나의 단말에서 다양한 서비스를 지원받을 수 있다. 따라서 본 논문의 두 개의 다른 통신 모듈의 통합된 단말 시스템을 제안하고 기존에 제안된 UTIS 기반의 분산 경로 탐색 방식을 DSRC 기반의 고속도로 교통 정보를 활용해서 새로운 경로탐색 알고리즘을 제안한다. 또한 향후 추가적으로 이루어질 연구와 현재 다른 주체들의 주도로 이루어지는 서비스를 제도적으로 보완할 수 있는 방안도 제시한다.

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Static Analysis of Two Dimensional Curbed Beam Structure by Finite Element-Transfer Stiffness Coefficent Method (유한요소-전달강성계수법에 의한 2차원 곡선 보 구조물의 정적해석)

  • Choi, Myung-Soo
    • Journal of Power System Engineering
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    • v.21 no.6
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    • pp.40-45
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    • 2017
  • The objective of this study is the finite element-transfer stiffness coefficient method, which is the combination of the modeling technique of finite element method and the transfer technique of transfer stiffness coefficient method, is applied in the static analyses of two dimensional curved beam structures. To confirm the effectiveness of the applied method, two computational models are selected and analyzed by using finite element method, finite element-transfer stiffness coefficient method and exact solution. The computational results of the static analyses for two computational models using finite element-transfer stiffness coefficient method are equal to those using finite element method. When the element partition number of curved beam structure is increased, the computational results of the static analyses using both methods approach the exact solution. We confirmed that the finite element-transfer stiffness coefficient method is superior to finite element method when the number of the curved beam elements is increased from the viewpoints of the computational speed and the utility of computer memory.

Optimum Design of Frame Structures Using Generalized Transfer Stiffness Coefficient Method and Genetic Algorithm (일반화 전달강성계수법과 유전알고리즘을 이용한 골조구조물의 최적설계)

  • Choi, Myung-Soo
    • Journal of Power System Engineering
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    • v.9 no.4
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    • pp.202-208
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    • 2005
  • The genetic algorithm (GA) which is one of the popular optimum algorithm has been used to solve a variety of optimum problems. Because it need not require the gradient of objective function and is easier to find global solution than gradient-based optimum algorithm using the gradient of objective function. However optimum method using the GA and the finite element method (FEM) takes many computational time to solve the optimum structural design problem which has a great number of design variables, constraints, and system with many degrees of freedom. In order to overcome the drawback of the optimum structural design using the GA and the FEM, the author developed a computer program which can optimize frame structures by using the GA and the generalized transfer stiffness coefficient method. In order to confirm the effectiveness of the developed program, it is applied to optimum design of plane frame structures. The computational results by the developed program were compared with those of iterative design.

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Emergency response system for safe operation of ships (선박 안전운전을 위한 응급대응 시스템 설계)

  • Kim, Yong Su
    • Smart Media Journal
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    • v.5 no.3
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    • pp.81-87
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    • 2016
  • In line with the sharp increase of container traffic from globalization, ships have become larger with an aim of improving the maritime transport capacity in addition to the growing interest in monitoring danger areas on ships considering the quantity increase of ships, along with the tightening of international standard for ship safety by IMO(international Maritime Organization). Korea established a location based ship accident forecasting and preventing system in 2012 by Korea Coast Guard, however its poor response in ship accidents has been pointed out in the wake of the recent disaster of Sewol ferry. To resolve this problem, this study attempts to design a wearable type, instant emergency response system that has DGPS to issue an alert on danger areas and automatically send ship's location and operation information in emergency situation.

The Design and Implementation of IoT-Based Radon Measurement Control System (IoT 기반 라돈 측정 제어시스템 설계 및 구현)

  • Ahn, Heuihak;Gu, Jayeong;Lee, Sangyoon
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.16 no.1
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    • pp.1-10
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    • 2020
  • This paper is a IoT-based radon meter control system and a radon meter control method using it. The IoT-based radon meter control system is control system for controlling a radon meter by network-connecting radon meter and a user terminal. The radon measuring device may be provided with a radon sensor to measure a radon value of a preset management target area, it collect and store numerical data. The radon meter control system monitors the condition of the radon meter, it includes control center configured to deliver radon meter management information generated to a user terminal. Also radon measurements to determine the exact amount of radon gas. Therefore, the situation-specific actions based on radon numbers can be promptly implemented to ensure adequate protection for those who are vulnerable to radon and those who live in the area. Condition monitoring allows the radon meter to respond quickly to failure or failure of the radon meter. In addition, it is possible to secure a baseline of radon's influence and to obtain research data to cope with radon by establishing big data with radon measurements.

The Design and Implementation of Embark / Disembark Management System Based on User Terminal Tagging (사용자 단말 태깅 기반 승하선 관리시스템의 설계 및 구현)

  • Lee, Sangyoon;Gu, Jayeong;You, Youngmo
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.16 no.3
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    • pp.1-11
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    • 2020
  • In this paper, we describe about the user terminal tagging-based embarkation/disembarkation management system and embarkation/disembarkation management method using this system. The system authenticates the validity of the user and on whether to board on the ship by tagging the user's terminal which the boarding reservation was made by using the management terminal provided in the ship. The system identifies on whether the user disembark in the ship by tagging the user's terminal. In the event of ship accident, it is easy to figure out the user and manage the non-contact boarding and disembarking. Therefore, we design the embarkation/disembarkation management system based on user's terminal tagging on the terminal provided in the ship and embarkation/disembarkation management method using this system. User terminal tagging can solve the problem of manpower required for the management of embarkation and disembarkation, the problem of requiring time to confirm the match between the reservation and the passenger, and the problem of increase of the possibility on the spread of infectious diseases due to face-to-face contact.

Field operation and improvements of developed VTS (VTS 국산화 개발 시스템의 현장운용과 주요기능 개선사항)

  • Lee, Byung-Gil;Jo, Kwan-tae;Choi, Byeong-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.43-44
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    • 2019
  • In recent years, VTS system was developed in Korea through a government R&D project for domestic manufacturers and operating authorities. The field test of the developed system in a real environment was constructed at the Gunsan VTS center. Testing was conducted for certain new IT convergence technology with VTS, such as traffic analysis, pilotage etc. So, we described some functions and advantages with tested VTS in real environment.

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Study for VTS Operating Using Bumper Contact point by Bumper Thery (범퍼이론을 사용한 선박접근 인식을 이용한 선박관제기법 연구)

  • Gang, Sang geun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.26-27
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    • 2019
  • This study is to calculate the Real-Time contact point of ellipses between the vessels ships by Ship's Bumper Theory. The Real-Time contact point of ship's bumper ellipses can be used the important tool to feel the perceived risk evaluation of ship's collision risk by VTS operator. In this paper, The warning information to feel the risk of collision between the vessels in advance is able to help them for VTS operation, We will study the technique to certify the perceived risk of collision from several different angles by programming.

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Behavioral reaction of common squid Todarodes pacificus to different colors of LED Light (LED 색광에 대한 살오징어의 행동반응)

  • An, Young-Il;Jeong, Hak-Geun;Jung, Bong-Man
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.45 no.3
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    • pp.135-143
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    • 2009
  • To study the behavioral reaction of common squid Todarodes pacificus, to different colors of LED light, individual distribution in the dark condition without LED light stimuli, individual distribution when four colors of light stimuli were at the sections of end and middle of water tank and the changes of gathering rates as the elapse of illuminating time were examined. When it was dark, the distribution of the fish in each section of the tank was U-shape regardless of the investigating time intervals, which means that Todarodes pacificus gathered at the both ends of the tank. The individual distribution when light stimuli were at the one end of the tank showed the tendency of gathering at the illuminated section and decreasing at the opposite section. There were 448 of them at the end of the tank when the light was blue, 352 when white, 302 when green and 132 when red. Thus the fish liked blue light the most, followed by white light. The variations of gathering rate at the both ends of tank as illuminating time elapsed showed the tendency of increasing at the light section (A section), however, it showed the tendency of decreasing at the darkest section (F section). The individual distribution showed the tendency of letter $\wedge$ of gathering at the center and decreasing at the both ends mostly when the light stimuli were at the middle section of tank. The gathering rates at the lighting section were 80.4% when red, 76.4% when white, 69.6% when green and 56.7% when blue. The fishes showed the affinity for the red light mostly, followed by the white light source. The red light and blue light showed the opposite when the light stimuli were at the one end of water tank. The variations of gathering rates as the elapse of time at the lighted section showed the tendency of gradual increasing in the four light sources. The color of light source showing the highest gathering rate within 25-30 minutes of light stimuli was the white, followed by the red.