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해양탐지체계 성능향상을 위한 합성고분자 기반 기능성 코팅제 개발
홍순국(Hong, Soon-Kook) 해군사관학교 해양연구소 2019 海洋硏究論叢 Vol.52 No.-
Lignin, which can be easily derived from the wood components, now widely have been studied for anti-bacterial and anti-microbial applications owing to its innate properties, ease flexibility and low cyto-toxicity. For potential applications of lignin-based materials for coating and protective layers of marine detection systems, its physico-chemical and biological properties must be studied. In this research, anti-bacterial and anti-microbial behaviors of both alkali and kraft lignins were studied by measuring the physical properties upon dissolution in organic solvent and investigating the anti-bacterial and anti-microbial characteristics using E. coli as a model system. The optimal concentrations of both alkali and kraft lignins were found to be 2 mg/mL for alkali lignin and 3 mg/mL for kraft lignin. The introduction of both lignins showed 10~30 % cyto-toxicity. Such a coating material can offer novel strategies to achieve the enhanced capability of marine detection system.
군용 수중 운동물체의 성능강화를 위한 초소수성 나노 패터닝 기술
홍순국(Soon-Kook Hong),이기영(Ki-Young Lee) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.2
A superhydrophobic surface means that the contact angle between the solid surface and a water droplet is more than 150°. Materials with a superhydrophobic surface have a self?cleaning function because of the Lotus effect, in which water is not absorbed by the material but rolls off of it. If such a Lotus effect can be applied to the surface of underwater vessels, submarines, torpedos, and so on, enhanced vessels can be made based on this lubricant effect reducing the friction coefficient for the liquid. Because polymer composites can be easily applied in various nanotechniques, they are more advantageous than conventional materials like iron in terms of a superhydrophobic surface. Furthermore, a superhydrophobic surface bring enhanced anticorrosion and ecotechnology because no paint is needed on underwater vessels.
무인수상정 열습효과로 인한 탄소복합재의 층간전단강도 저하에 관한 연구
홍순국(Soon-Kook Hong) 한국해군과학기술학회 2022 Journal of the KNST Vol.5 No.2
To assess water diffusion and degradation of Unmanned Surface Vehicle by Hydrothermal effect, the specimens were exposed to a variety of thermal and time conditions. Furthermore, after immersing the specimens in seawater and distilled water for 72 weeks, the amount of water uptake was tested by gravimetric analysis and the results followed Fick law. Degradation of ILSS was measured from SBS test of specimens exposed to hydrothermal conditions. As a result, correlation of water diffusion and degradation of ILSS was validated and the feature in seawater involving saline was evaluated.
극한 환경에서 급속발열과 장기내구성을 가지는 CNT 필름 개발
홍순국(Hong, Soon-Kook) 해군사관학교 해양연구소 2018 海洋硏究論叢 Vol.51 No.-
Carbon nanotube (CNT) composites widely have been studied for resistive heating applications (such as de-icing unit, patternable micro heaters and water heater) owing to their light-weight properties, flexibility and rapid heating. For mass product of CNT composite as resistive heating element applications, the change of electrical resistance with different temperature must be studied. In this research, resistive heating behavior of CNT/Polydimethylsiloxane (PDMS) composite film were studied by measuring the change in electrical resistance under temperature from -40 ℃ to 100 ℃. The CNT/PDMS composite film showed 25 % resistance change from -40 ℃ to 100 ℃. The polymer coefficient of thermal expansion (CTE) is an important factor to consider in the design of CNT composites as a heating unit. The CNT/PDMS composite is appropriate for de-icing application and flexible heating element owing to the lower degree of electrical resistance change.
충남지역(忠南地域) 유우유방염(乳牛乳房炎)의 감염율(感染率) 및 원인균(原因菌)에 관한 연구(硏究)
김홍수,홍순국,소경택,한홍률,Kim, Hong Soo,Hong, Soon Kook,So, Kyung Tack,Han, Hong Ryul 대한수의학회 1974 大韓獸醫學會誌 Vol.14 No.1
A total of 820 dairy cattle were examined formastitis by California mastitis test method and 181 dairy cattle were examined bacteriologically according to the method of Connecticut mastitis control program. The results obtained were as followings: 1. Milk samples from 1.231(38.1%) of 3,225 quarters and 568(69.3%) of 820 dairy cattle were positive for mastitis by California mastitis test method. 2. Among 181 cattle examined bacteriologically by the method of Connecticut mastitis control program 159(22.9%) quarters of 102(56.4%) cattle were infected. Clinical mastitis was found in 5 cattle. 3. Important causative organisms were found to de Staphylococcus aureus(44.8%), Streptococcus agalactiae(21.5%), and non-str, agalactiae Streptococcus(26.4%). Corynebacterium ssp., Pseudomonas spp., Coliforms and Yeasts were also occasionally found to be causative organisms. 4. Strains of Staphylococcus aureus isolated from bovine udders were tested for sensitivity to antibiotics. The rates of resistant strain were 13.7%, 11.8%, 8.8%, 5.9%, 100%, 4.9% and 4.9% for penicillin G, streptomycin, terramycin, erythromycin, chloramphenicol, ampicillin and kanamycin, respectively.
운용개념 개발 프로세스를 활용한 무인수상정(USV) 탑재 모함의 운용 요구사항 분석
허장완,홍순국,임경한,유재관,Hur, Jang Wan,Hong, Soon Kook,Lim, Kyung Han,Ryu, Jae Kwan 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1
The South Korean Navy is making efforts to acquire vessels that the new technology of the 4th industry is applied, and as a part of these efforts, it has a plan to mount and operate an Unmanned Surface Vehicle(USV) on a vessel that will be introduced later. However, the recent studies have focused on only development of common platforms and mission equipment for the USV, and have not sufficiently analyzed studies and operatinoal requirements on mother ship that will operate the mounted USV. Hence, this study analyzed and presented requirements of mother ship with the mounted USV in order to operate effectively it when the future medium and large vessels to be acquired by the South Korean Navy intent to operate the USV.
소나체계의 OMS/MP 설정과 유사체계 운용실적 분석을 통한 RAM 목표값 설정 방안 연구
송기훈,박영만,홍순국,민승식,유재우,최충현,Song, Ki-Hoon,Park, Young-Man,Hong, Soon-Kook,Min, Seung-Sik,You, Jea Woo,Choi, Chung Hyun 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.1
In this research, items and contents of SONAR were derived from investigation of OMS/MP of previously-operated submarines and domestic and international references related to weapon system. Such items and contents were established in detail and were categorized into four separate groups after consulting system design experts and specialists in the field of SONAR's operation. Ultimately, based on wartime and peacetime scenario and operation concept of SONAR, RAM values were obtained through various methods using submarine-operating records and maintenance records for the past eleven years.
한민석(Min-Seok Han),유재관(Jae-Kwan Ryu),홍순국(Soon-Kook Hong) 한국정보전자통신기술학회 2019 한국정보전자통신기술학회논문지 Vol.12 No.4
본 논문에서는 10m급 무인수상정의 RCS 해석과 함께 RCS 증가 요인을 분석하고 RCS 감소 방안을 도출하였다. 기하학적 형상을 변형시키는 성형기법을 통해 레이다 단면적을 감소시킬 수 있고, 이것을 스텔스 무인수상정 개발에 활용할 수 있음을 확인한다. RCS 감소를 위해 기존의 Top Mast 부분을 함미부분으로 1m 이동시키고 경사각 5도를 준 후 0.5 m 아래로 이동시킨 다음 중앙과 주변 반사 구조물에 대한 영향을 최소화시키기 위해 주변에 Guided Wall을 추가 설치하였다. 기존 모델과의 RCS 해석 값을 비교 분석한 결과 모든 고각에 대해 감소 대책이 적용된 모델이 기존 모델보다 -3.79 dB 이상 낮아진 것을 알 수 있으며, 최대 대푯값은 기존 모델 고각 0도의 12.74 dB에서 6.32dB로 낮아졌다. 특히, 희생각 영역을 제외한 영역에서 강한 산란 현상이 상당부분 제거된 것을 확인할 수 있다. 또한, Guide wall을 추가한 -5m ~ 2 m 부분의 경우 반사되는 신호가 최대 20 ~ 40 dB 이상 개선되어 2D ISAR 영상에 나타나지 않는 것을 알 수 있다. 무인수상정 RCS 분석은 거리방향 프로파일 분석과 ISAR 영상 분석을 통해 문제 위치를 분석, 식별하는 과정을 설명하였으며, 그에 대한 문제를 해결할 수 있는 RCS 감소 방안을 함께 제시하였다. In this paper, the RCS analysis of the 10m unmanned surface vehicles was performed, and the factors of RCS increase were analyzed. Modeling techniques by transforming a geometric shape can reduce the RCS area, which can be used to develop stealth unmanned surface vehicles. In order to reduce the RCS, the existing Top Mast part was moved 1m to the tail part, the 5 degree tilt angle was moved below 0.5 m, and additional guided walls were installed to minimize the influence on the center and surrounding corner reflecting structures. As a result of comparing and analyzing the RCS analysis value with the existing model, it can be seen that the reduced countermeasure model is -3.79 dB lower than the existing model for all elevations. In particular, it can be seen that the strong scattering phenomenon is substantially removed in the region except the sacrificial angle region. In addition, it can be seen that in the case of -5m to 2m where the guide wall is added, the reflected signal is improved up to 20 to 40 dB or more, so that it does not appear on the 2D ISAR image. RCS analysis of unmanned surface vehicles explained the process of analyzing and identifying problem location through distance profile analysis and ISAR image analysis.