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다중 GPS 삼각측량보정법을 이용한 LoRaWAN기반 실시간 해류관측시스템 개발
강영관 ( Young-gwan Kang ),이우진 ( Woo-jin Lee ),임재홍 ( Jae-hong Yim ) 한국센서학회 2022 센서학회지 Vol.31 No.1
Herein, we propose a LoRaWAN-based small draft system that can measure the ocean current flow (speed, direction, and distance) in real time at the request of the Coast Guard to develop a device that can promptly find survivors at sea. This system has been implemented and verified in the early stages of rescue after maritime vessel accidents, which are frequent. GPS signals often transmit considerable errors, so correction algorithms using the improved triangulation method algorithm are required to accurately indicate the direction of currents in real time. This paper is structured in the following manner. The introduction section elucidates rescue activities in the case of a maritime accident. Chapter 2 explains the characteristics and main parameters of the GPS surveying technique and LoRaWAN communication, which are related studies. It explains and expands on the critical distance error correction algorithm for GPS signals and its improvement. Chapter 3 discusses the design and analysis of small draft buoys. Chapter 4 presents the testing and validation of the implemented system in both onshore and offshore environments. Finally, Section 5 concludes the study with the expected impact and effects in the future.
함정용 화물 승강기 다단 수밀문의 구조강도 신뢰성 해석
박윤용(Yoon Yong Park),박종환(Jong Hwan Park),송창용(Chang Yong Song),양정욱(Jeong Wook Yang),강영관(Young Gwan Kang) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The various weapons and equipment mounted on a warship must be secured for the safe transport. A cargo lift system with multi-stage watertight door is installed on the warship for such safe transport. The multi-stage watertight door of cargo lift should be able to transport heavy cargo with the guarantee of the watertight to facilitate the maritime military operations. In this study, structural strength evaluation and reliability analysis of the multi-stage watertight door of cargo lift were performed considering load conditions based on the DNV and EN rule load test specification. For the evaluation of structural strength, the three-dimensional finite element model of multi-stage watertight door of cargo lift was created and finite element analysis was performed by applying the load conditions. Reliability analysis was performed using Monte Carlo Simulation(MCS) in order to improve design safety by considering uncertainty of operating environment. In the reliability analysis, the reliability level of structural strength results considering an operation load variation were evaluated.