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정현주,양창섭,정우진,Chung, Hyun-Ju,Yang, Chang-Seob,Jung, Woo-Jin 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.3
This paper describes design and construction results of the measurement system developed on the purpose of measuring properties of AC magnetic field sensors used in the weapon system. The system for measuring the properties of AC magnetic field sensors consist of 3-axis helmholtz coil, signal generator, signal amplifier, sensor data acquisition unit and AC magnetic field sensor property measurement & analysis equipment including the operating software. By using this system, we can measure various properties of AC magnetic field sensor such as sensitivity, linearity and dynamic response in the frequency from 1 Hz to 10 kHz. Finally we also verified its performance by measuring the property of a MAG 639, standard magnetic field sensor of bartington instruments, with the developed measurement system.
함정의 선체 부식에 의한 수중 전자기 신호 예측에 관한 연구
정현주,양창섭,주혜선,전재진,Chung, Hyun-Ju,Yang, Chang-Seob,Ju, Hae-Sun,Jeon, Jae-Jin 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
Corrosion currents flow through the seawater due to the different electrochemical potential between a hull and a propeller under the draft line of ship. Additionally, in order to protect the hull and other sensitive anodic parts of the ship from corrosion, the corrosion protection system, called impressed current cathodic protection(ICCP) equipment has been installed in most naval ships. Those currents could be harmful to the electromagnetic silencing of the naval ship because sea mines are triggered by even a feeble field value. In this paper, we described electric and corrosion related magnetic fields by ship's galvanic corrosion and a corrosion protection system, and prediction results of electric and corrosion related magnetic fields at any depth for the model ship.
선체 부식 및 부식 방지장치에 의한 수중 전기장 신호 해석 방안 연구
정현주,양창섭,전재진,Chung, Hyun-Ju,Yang, Chang-Seob,Jeon, Jae-Jin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.2
The galvanic corrosion of a vessel, or systems fitted to minimize the ship's corrosion such as ICCP (Impressed Current Cathodic Protection) system and sacrificial anodes, can lead to significant electrical current flow in the sea. The presence of vessel's current sources associated with corrosion will give rise to detectable electric field surrounding the vessel and can put it at risk from mine threats. For this reason, it is necessary to design corrosion protection systems so that they don't only prevent a hull corrosion but also minimize the electric field signature. In this paper, we describe theoretical backgrounds of underwater electric field signature due to corrosion and corrosion protection system on naval vessels and analysis results of the electric field according to the ship's hull and it's propeller coating damage and ICCP anode displacement.
능동형 자기센서의 송신출력 향상을 위한 송신기 설계에 관한 연구
정현주(Hyun-Ju Chung),양창섭(Chang-Seob Yang),전재진(Jae-Jin Jeon) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.5
A active magnetic sensor has been widely used in the underwater guided weapon system because it is able to detect a target accurately in close range, but the target doesnt have any good countermeasure to overcome the threat from the active magnetic sensor. Recently, in order to increase the damage area of target by shock wave with explosion of the underwater weapon system and to detect small target, the maximum target detection range of the active magnetic sensor needs to be increased. One method for improving maximum target detection range is to improve output power from transmitter through demagnetization factor minimization of a transmitting core. Thus, in this paper, we describe the study results on the transmitter core shape design to enhance output power of the active magnetic sensor.
정현주(Hyun-Ju Chung),배기웅(Gi-Woong Bae),양창섭(Chang-Seob Yang) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.3
There is the Flash-D demagnetization method as conventional demagnetization method for a naval ship without a degaussing system. It is the method for reducing magnetic fields from the ship as obtained the reverse permanent vertical magnetization (PVM) that counteracts the induced vertical magnetization (IVM) in the target ship due to the earth’s magnetic field. However, it is a little difficult to use in a real ship because it involves three-stage protocol and the procedure is also very complex. Therefore, in this paper, we propose the Flash-KD demagnetization method configured with two-stage demagnetization protocol for enhancing the difficulty in a practice of the conventional Flash-D demagnetization method. In the first stage of Flash-KD method, we obtain a very strong PVM. In the second stage, we gain the wanted PVM for compensating the IVM with minimization of a permanent longitudinal magnetization as adjusting the value of a horizontal start field and the total applied field number of the second stage. The proposed method has been applied to a scaled model ship to verify the performance. As a result of that, we could determine successfully the protocol which can remove VM.
매질 민감도를 이용한 함정 전기장 신호원 모델링에 관한 연구
정현주(Hyun-Ju Chung),양창섭(Chang-Seob Yang),전재진(Jae-Jin Jeon),정기우(Gi-Woo Jung),김동훈(Dong-Hun Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper deals with the numerical implementation of the material sensitivity analysis, which is used to efficiently determine an optimal electric current distribution on a ship hull by corrosion of ship. A material sensitivity formula for the forward problem formulated in terms of the equivalent current method is analytically derived. Then, the components of the adjoint system including the electric pseudo-source are thoroughly investigated in order to obtain the first-order gradient information of an objective function with respect to the electric current. The purposed method has been successfully applied to a model ship and the predicted result on the underwater electric field due to corrosion of ship have been compared to that computed by FNREMUS software.