• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.2
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• pp.85-93
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• 2021

In this paper, the aerodynamic characteristics of general tail controlled missile were predicted and corrected the result using semi-empirical analysis tool. The cause of the error was confirmed by comparing the aerodynamic characteristics prediction result of the semi-empirical analysis tool with the wind tunnel test result, and the main error factor of the semi-empirical analysis tool was the interference component between the main wing and the tail wing. The semi-empirical analysis results were corrected using the wind tunnel test results and the computational analysis results, and it was confirmed that the corrected data agrees well with the wind tunnel test results. Through this study, it was confirmed that the wing-tail interference component correction is needed when predicting the aerodynamic characteristics of a general tail controlled missile using a semi-empirical analysis tool.

• 대한핵의학회:학술대회논문집
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• 2002.11a
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• pp.33.1-33.1
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• 2002

• 한국ITS학회:학술대회논문집
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• v.2007 no.10
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• pp.28-34
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• 2007

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2004.11a
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• pp.61-61
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• 2004

• Journal of Navigation and Port Research
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• v.35 no.10
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• pp.799-804
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• 2011

The hydrodynamic interaction effects between the multi-bodies can not be neglected when vessels are close to each other in congested and confined waters, such as in a harbour or narrow channel. Increase in speed and size of modern vessels make it necessary to consider this interaction effects when designing harbours and navigation channels. In this research, the hydrodynamic interaction effects of the spacing between vessels and water depth along with ship's velocity are summarized and discussed. The goal of this research is to propose a guideline of appropriate speed and distance between passing and moored vessels to avoid the influence of hydrodynamic forces and to navigate safely in confined sea areas.

• Journal of Navigation and Port Research
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• v.37 no.4
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• pp.345-350
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• 2013

It is well known that the hydrodynamic forces and moments induced by the proximity of bank in confined waters, such as in a harbour or narrow channel affect ship's maneuvering motion. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic force between ship and breakwater is applied, and also, the characteristic features of hydrodynamic force acting on a large vessel in the proximity of a breakwater are described and illustrated. Furthermore, the effects of water depth and the lateral spacing between ship and breakwater are summarized and discussed.

• Journal of the Korean Society of Marine Environment & Safety
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• v.9 no.2
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• pp.31-37
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• 2003

In these days, several bridges have been built or under construction over navigational channel in Korea. In these cases there must be careful consideration for the marine safety of vessels to be passed by below the bridge. This paper aims to analyze the factors influencing maritime traffic safety and to figure out ample width of main span of these kinds of bridges through the reference study and FMSS.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.3-10
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• 2002

Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards is reviewed from the viewpoint of safe operation. Three types of assumed series-ships, which have systematically different instability on course, are taken as tested models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in situation of curved, narrow of waterway by five pilots in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. Three kinds of IMO's criterion concerning yaw-checking and course-keeping ability are discussed and new criteria are proposed.

• The Journal of Internal Korean Medicine
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• v.15 no.2
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• pp.37-47
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• 1994

To investigate the effect of ILGUAN-JEON on liver and gastrointestinal track. this experiment were performed and obtained results wewe as follows. 1. ILGUAN-JEON depressed the isolated intestine movement and showed anti- acethylcholine and barium chloride effect in mice. 2. ILGUAN-JEON showed anti- acethylcholine and barium chloride effect on isolated stomach in rats. 3. ILGUAN-JEON showed anti-ulcer effect in rats induced by indomethacin and pyrous cracking. 4. ILGUAN-JEON depressed the gastric lesion in rats induced by HCI-ethanol. 5. ILGUAN-JEON depressed the gastric juice and pepsin secretion, free acid and total acid level in Shay rats. 6. ILGUAN-JEON depressed the GOT and GPT level in rats induced by $CCl_4$ and d-galactosamine. From above results, think that ILGUAN-JEON can be applied to recover the liver and gastrointestinal function.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.356-359
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• 2018

최근 드론의 사진영상촬영은 지형 감시를 위한 항공사진용으로 많이 쓰이고 있다 이것을 드론의 짐벌제어를 통해 아주 정교하고 정확하고 신속하게 영상촬영을 이끌어 낼 수 있으며, 본 논문에서는 짐벌과 센서간의 자동 조종 장치와 함께 제안되었다. 짐벌의 제어기능은 센서를 통해 자동 조종 비행 제어 시스템으로 구현되어 할당된 고정 소수점 대상. 공중 짐벌 프레임에서 지구 프레임으로의 좌표 변환 짐벌 본체 프레임 좌표가 대상에 올바르게 정렬되어야하고 짐벌 잠금 문제를 피하고, 짐벌의 제어를 안정적인 마이크로 컨트롤러로 구현이 가능토록 하여 기존 짐벌 제어 보다 흔들림이 없고 정교한 영상촬영 실현 할 것 입니다.